Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41586-024-08542-2

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Authorship：Corresponding author  

DOI： 10.1101/2025.01.09.631479

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Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s11626-024-00911-5

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Language：English   Publishing type：Research paper (scientific journal)  

The limited capacity of articular cartilage for self-repair is a critical challenge in orthopedic medicine. Here, we aimed to develop a simplified method of generating chondrocyte particles from human-induced pluripotent stem cell-derived expandable limb-bud mesenchymal cells (ExpLBM) using a cell self-aggregation technique (CAT). ExpLBM cells were induced to form chondrocyte particles through a stepwise differentiation protocol performed on a CAT plate (prevelex-CAT®), which enables efficient and consistent production of an arbitrary number of uniformly sized particles. Histological and immunohistochemical analyses confirmed that the generated chondrocyte particles expressed key cartilage markers, such as type II collagen and aggrecan, but not hypertrophic markers, such as type X collagen. Additionally, when these particles were transplanted into osteochondral defects in rats with X-linked severe combined immunodeficiency, they demonstrated successful engraftment and extracellular matrix production, as evidenced by Safranin O and Toluidine Blue staining. These data suggest that the plate-based CAT system offers a robust and scalable approach to produce a large number of chondrocyte particles in a simplified and efficient manner, with potential application to cartilage regeneration. Future studies will focus on refining the system and exploring its clinical applications to the treatment of cartilage defects.

DOI： 10.3390/ijms252212063

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)日本小児外科学会  

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Language：Japanese   Publisher：(一社)日本小児外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Paired related-homeobox 1 (PRRX1) is a transcription factor in the regulation of developmental morphogenetic processes. There is growing evidence that PRRX1 is highly expressed in certain cancers and is critically involved in human survival prognosis. However, the molecular mechanism of PRRX1 in cancer malignancy remains to be elucidated. METHODS: PRRX1 expression in human Malignant peripheral nerve sheath tumours (MPNSTs) samples was detected immunohistochemically to evaluate survival prognosis. MPNST models with PRRX1 gene knockdown or overexpression were constructed in vitro and the phenotype of MPNST cells was evaluated. Bioinformatics analysis combined with co-immunoprecipitation, mass spectrometry, RNA-seq and structural prediction were used to identify proteins interacting with PRRX1. RESULTS: High expression of PRRX1 was associated with a poor prognosis for MPNST. PRRX1 knockdown suppressed the tumorigenic potential. PRRX1 overexpressed in MPNSTs directly interacts with topoisomerase 2 A (TOP2A) to cooperatively promote epithelial-mesenchymal transition and increase expression of tumour malignancy-related gene sets including mTORC1, KRAS and SRC signalling pathways. Etoposide, a TOP2A inhibitor used in the treatment of MPNST, may exhibit one of its anticancer effects by inhibiting the PRRX1-TOP2A interaction. CONCLUSION: Targeting the PRRX1-TOP2A interaction in malignant tumours with high PRRX1 expression might provide a novel tumour-selective therapeutic strategy.

DOI： 10.1038/s41416-024-02632-8

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：日本レックリングハウゼン病学会  

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Language：English   Publishing type：Research paper (scientific journal)  

T-cell acute leukemia and lymphoma have a poor prognosis. Although new therapeutic agents have been developed, their therapeutic effects are suboptimal. α-Pinene, a monoterpene compound, has an antitumor effect on solid tumors; however, few comprehensive investigations have been conducted on its impact on hematologic malignancies. This report provides a comprehensive analysis of the potential benefits of using α-pinene as an antitumor agent for the treatment of T-cell tumors. We found that α-pinene inhibited the proliferation of hematologic malignancies, especially in T-cell tumor cell lines EL-4 and Molt-4, induced mitochondrial dysfunction and reactive oxygen species accumulation, and inhibited NF-κB p65 translocation into the nucleus, leading to robust apoptosis in EL-4 cells. Collectively, these findings suggest that α-pinene has potential as a therapeutic agent for T-cell malignancies, and further investigation is warranted.

DOI： 10.1111/cas.16086

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Language：Japanese   Publisher：(一社)日本移植学会  

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Publishing type：Research paper (scientific journal)   Publisher：American Society of Hematology  

T-cell acute leukemia and lymphoma have poor prognoses, necessitating the development of novel therapeutic agents. In this study, we investigated the antitumor activity of α-pinene, a monoterpene compound, against T-cell tumors. We evaluated the effects of α-pinene on cell growth inhibition in vitro using the murine T-cell tumor cell line EL-4 and the human-derived T-cell tumor cell line Molt-4. In addition, we assessed the effects of limonene, another monoterpene with reported tumor-suppressive effects, as a comparative agent.

Both α-pinene and limonene demonstrated concentration- and time-dependent inhibition of cell growth in both the EL-4 and Molt-4 cell lines (Figure 1). Moreover, α-pinene exhibited greater potency than limonene in inhibiting the growth of various hematologic malignancies. Importantly, α-pinene and limonene had minimal effects on the growth of normal murine spleen T cells. Further investigation of the mechanisms of action of α-pinene revealed its ability to induce apoptosis and cell cycle arrest in EL-4 and Molt-4 cells. Transcriptomic profiling of α-pinene-treated EL-4 cells using RNA-seq identified differentially expressed genes associated with cellular damage and mitochondrial dysfunction. Increased intracellular ROS levels and mitochondrial impairment were observed in the T-cell tumors treated with α-pinene. The activation of intrinsic apoptotic pathways involving EGR1, p53, BCL-2, and BAX was found to contribute to α-pinene-induced apoptosis in T-cell tumors. Moreover, α-pinene inhibited the NF-κB signaling pathway, resulting in the reduced nuclear translocation of NF-κB p65 and decreased total intracellular NF-κB p65 levels in EL-4 cells. Additionally, we discovered that α-pinene induced ferroptosis, a newly identified programmed cell death process, in EL-4 cells through lipid peroxidation and iron accumulation. Activation of the system x c−/GSH/GPX4 axis and upregulation of iron transporters, such as Slc39a8 and TfR1, were observed in α-pinene-induced ferroptosis. Treatment with the ferroptosis inhibitor Fer-1 partially reversed the tumor-inhibiting effect of α-pinene in EL-4 cells. Finally, we administrated α-pinene to mice subcutaneously injected with luciferase-expressing EL-4 to evaluate the efficacy of α-pinene in vivo. The tumor growth was significantly inhibited by α-pinene treatment (vehicle: 1055 ± 101 mm 3; α-pinene: 701 ± 82 mm 3, p < 0.01, Figure 2) without adverse effects on body weight or behavior. Immunohistochemistry analyses revealed a significant increase of CD8 + T-cells (vehicle: 8.1 ± 2.7 cells / field of view; α-pinene: 43.1 ± 12.2 cells / field of view , p < 0.05) and NK1.1 + cells (vehicle: 5.1 ± 1.0 cells / field of view ; α-pinene: 41.1 ± 9.8 cells / field of view , p < 0.01) in the tumors, suggesting that α-pinene may have an indirect antitumor effect by recruiting immune cells into tumors.

Overall, our findings demonstrate the antitumor activity of α-pinene against T-cell tumors through the induction of apoptosis, cell cycle arrest, and ferroptosis. α-Pinene shows promise as a potential therapeutic agent for T-cell tumors and warrants further investigation for its clinical application.

DOI： 10.1182/blood-2023-181447

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Language：English   Publishing type：Research paper (scientific journal)  

Production of cartilaginous particles for regenerative medicine requires a large supply of chondrocytes and development of suitable production techniques. Previously, we successfully produced human induced pluripotent stem cell (hiPSC)-derived limb bud mesenchymal cells (ExpLBM cells) with a high chondrogenic differentiation potential that stably proliferate. It may be possible to use these cells in combination with a stirred bioreactor to develop a tissue-engineered cell culture technology with potential for scale-up to facilitate production of large amounts of cartilaginous particles. ExpLBM cells derived from 414C2 and Ff-I 14s04 (human leukocyte antigen homozygous) hiPSCs were seeded into a stirred bioreactor containing cartilage induction medium. To characterize the cartilaginous particles produced, we performed real-time quantitative reverse transcription-polymerase chain reaction and histological analyses. Additionally, we transplanted the cartilage tissue into osteochondral defects of immunocompromised rats to assess its functionality, and evaluated engraftment of the grafted tissue. We successfully produced large amounts of cartilaginous particles via cartilage induction culture in a stirred bioreactor. This tissue exhibited significantly increased expression levels of type II collagen (COL2), aggrecan (ACAN), and SRY-box transcription factor 9 (SOX9), as well as positive Safranin O and Toluidine blue staining, indicating that it possesses characteristics of hyaline cartilage. Furthermore, engrafted tissues in osteochondral knee defects of immunodeficient rats were positively stained for human vimentin, COL2, and ACAN as well as with Safranin O. In this study, we successfully generated large amounts of hiPSC-derived cartilaginous particles using a combination of tissue engineering techniques. This method is promising as a cartilage regeneration technology with potential for scale-up.

DOI： 10.1016/j.bbrc.2023.149146

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Language：English   Publishing type：Research paper (scientific journal)  

With the advancement of tissue engineering technologies, implantable materials have been developed for use in facial plastic surgery, including auriculoplasty and rhinoplasty. Tissue-engineered cartilage comprising only cells and cell-produced extracellular matrix is considered valuable as there is no need to consider problems associated with the absorption of scaffold materials and the generation of immune responses. However, it is exceedingly difficult to produce large-sized complex shapes of cartilage without the use of scaffolds. In this study, we describe the production of shape-designable cartilage using a novel cell self-aggregation technique (CAT) and chondroprogenitor cells derived from human induced pluripotent stem cells as the source. The method described does not require special equipment such as bio-3D printers, and the produced tissue can be induced into well-matured cartilage with abundant cartilage matrix in vitro. Using CAT, we were able to generate cartilage in the form of rings or tubes with adjustable inner diameter and curvature, over a range of several centimeters, without the use of scaffolds. The in vitro fabrication of shape-designable cartilage using CAT will undoubtedly contribute to developments in the field of facial plastic surgery.&#xD.

DOI： 10.1088/1748-605X/ad02d1

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(一社)日本移植学会  

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Language：Japanese   Publisher：(一社)日本移植学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Cell sheet fabrication for articular cartilage regenerative medicine necessitates a large number of chondrocytes of consistent quality as a cell source. Previously, we have developed human-induced pluripotent stem cell (iPSC)-derived expandable PRRX1+ limb-bud mesenchymal cells (ExpLBM) with stable expansion and high chondrogenic capacity, while in this study; our ExpLBM technology was combined with cell sheet engineering to assess its potential as a stable cell source for articular cartilage regeneration. METHODS: ExpLBM cells derived from human-induced pluripotent stem cells (hiPSCs), including 414C2 and Ff-KVs09 (HLA homozygous), were seeded onto a culture plate and two-dimensional chondrogenic induction (2-DCI) was initiated. After 2-DCI, ExpLBM-derived chondrocytes were stripped and transferred to temperature-responsive culture inserts and the chondrocyte sheets were histologically examined or transplanted into osteochondral knee defects of immunodeficient rats. RESULTS: Immunohistochemistry revealed that ExpLBM-derived cell sheets were positive for Safranin O, COL2, and ACAN but that they were negative for COL1 and RUNX2. Furthermore, the engrafted tissues in osteochondral knee defects in immunodeficient rats were stained with SafO, human VIMENTIN, ACAN, and COL2. CONCLUSIONS: The present study is the first to report the chondrocyte sheet fabrication with hiPSC-derived cell source. hiPSC-derived ExpLBM would be a promising cell source for cell sheet technology in articular cartilage regenerative medicine.

DOI： 10.1186/s13287-023-03252-4

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Language：Japanese   Publisher：日本レックリングハウゼン病学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Here, we present a protocol for the selective differentiation of human pluripotent stem cells mimicking human developmental processes into expandable PRRX1+ limb-bud mesenchymal (ExpLBM) cells. This approach enables expansion through serial passage while maintaining capacity for chondrogenic differentiation. For complete details on the use and execution of this protocol, please refer to Yamada et al. (2021, 2022).

DOI： 10.1016/j.xpro.2022.101786

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Language：English   Publishing type：Research paper (scientific journal)  

Tendon regeneration is difficult because detailed knowledge about tendon progenitor cells (TPCs), which produce tenocytes to repair tendon tissue, has not been revealed. Mohawk homeobox (MKX) is a marker of TPCs or tenocytes, but a human pluripotent stem cell (hPSC)-based reporter system that visualizes MKX+ cells has not been developed. Here, we established an hPSC-derived MKX-tdTomato reporter cell line and tested the induction ratio of MKX-tdTomato+ cells using our stepwise/xeno-free differentiation protocol. MKX-tdTomato+ cells were generated with high efficiency and expressed tendon-specific markers, including MKX, SCX, TNMD, and COL1A1. Our MKX-tdTomato hPSC line would be a useful tool for studying the development or regeneration of tendon tissue.

DOI： 10.1186/s13287-022-03203-5

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Language：English   Publishing type：Research paper (scientific journal)  

Three-dimensional cell constructs comprising only tissue-specific cells and extracellular matrix secreted by them would be ideal transplants, but their fabrication in a cell aggregation manner without cell scaffolds relies on random cell self-aggregation, making the control of their size and shape difficult. In this study, we propose a method to fabricate band-shaped tissues by inducing the self-aggregation of cell sheets using the developed cell self-aggregation technique (CAT). Acting as cell aggregation stoppers, silicone semicircular pillars were attached to two positions equidistant from both short ends of the rounded rectangular culture groove and coated with a specifically charged biomimetic polymer as a CAT-inducing surface. Mesenchymal stem cells, chondrocytes, and skeletal myoblast cells seeded on the surface of the culture grooves formed band-shaped aggregates between the two aggregation stoppers following spontaneous detachment with aggregation of the cell sheet from the outer edge of the grooves during day one of culture. The aggregated chondrocyte band matured into a cartilage-like plate with an abundant cartilage matrix while retaining its band shape after two weeks of chondrogenic cultivation. Additionally, the aggregates of mesenchymal stem cells and myoblast cell bands could patch the induced collagen membrane derived from rat subcutaneous tissue like a bandage immediately after their formation and successfully mature into fat and muscle tissues, respectively. These results indicate that, depending on the cell type, scaffold-free band-shaped cell aggregates produced by CAT have the potential to achieve tissue regeneration that follows the shape of the defect viain vitromaturation culture orin vivoorganization.

DOI： 10.1088/1748-605X/ac9c7f

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Our previous gene profiling analysis showed that the transcription cofactor vestigial-like 3 (VGLL3) gene expression was upregulated by mechanical tension in the mouse cranial suture, coinciding with accelerated osteoblast differentiation. Therefore, we hypothesized that VGLL3 plays a significant role in osteogenic differentiation. To clarify the function of VGLL3 in osteoblasts, we examined its expression characteristics in mouse bone tissue and the osteoblastic cell line MC3T3-E1. We further examined the effects of Vgll3 knockdown on osteoblast differentiation and bone morphogenetic protein (BMP) signaling. In the mouse cranial suture, where membranous ossification occurs, VGLL3 was immunohistochemically detected mostly in the nucleus of osteoblasts, preosteoblasts, and fibroblastic cells. VGLL3 expression in MC3T3-E1 cells was transient and peaked at a relatively early stage of differentiation. RNA sequencing revealed that downregulated genes in Vgll3-knockdown cells were enriched in gene ontology terms associated with osteoblast differentiation. Interestingly, most of the upregulated genes were related to cell division. Targeted Vgll3 knockdown markedly suppressed the expression of major osteogenic transcription factors (Runx2, Sp7/osterix, and Dlx5) and osteoblast differentiation. It also attenuated BMP signaling; moreover, exogenous BMP2 partially restore osteogenic transcription factors' expression in Vgll3-knockdown cells. Furthermore, overexpression of Vgll3 increased the expression of osteogenic transcription factors. These results suggest that VGLL3 plays a critical role in promoting osteoblast differentiation and that part of the process is mediated by BMP signaling. Further elucidation of VGLL3 function will increase our understanding of osteogenesis and skeletal disease etiology.

DOI： 10.1007/s00223-022-00997-7

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Language：English   Publishing type：Research paper (scientific journal)  

Stem cell-based therapies and experimental methods rely on efficient induction of human pluripotent stem cells (hPSCs). During limb development, the lateral plate mesoderm (LPM) produces limb-bud mesenchymal (LBM) cells that differentiate into osteochondroprogenitor cells and form cartilage tissues in the appendicular skeleton. Previously, we generated PRRX1-tdTomato reporter hPSCs to establish the protocol for inducing the hPSC-derived PRRX1+ LBM-like cells. However, surface antigens that assess the induction efficiency of hPSC-derived PRRX1+ LBM-like cells from LPM have not been identified. Here, we used PRRX1-tdTomato reporter hPSCs and found that high pluripotent cell density suppressed the expression of PRRX1 mRNA and tdTomato after LBM-like induction. RNA sequencing and flow cytometry suggested that PRRX1-tdTomato+ LBM-like cells are defined as CD44high CD140Bhigh CD49f-. Importantly, other hPSC lines, including four human induced pluripotent stem cell lines (414C2, 1383D2, HPS1042, HPS1043) and two human embryonic stem cell lines (SEES4, SEES7), showed the same results. Thus, an appropriate cell density of hPSCs before differentiation is a prerequisite for inducing the CD44high CD140Bhigh CD49f- PRRX1+ LBM-like cells.

DOI： 10.3390/ijms23052661

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Language：English   Publishing type：Research paper (scientific journal)  

Optogenetics, a technology to manipulate biological phenomena thorough light, has attracted much attention in neuroscience. Recently, the Magnet System, a photo-inducible protein dimerization system which can control the intracellular behavior of various biomolecules with high accuracy using light was developed. Furthermore, photoactivation systems for controlling biological phenomena are being developed by combining this technique with genome-editing technology (CRISPR/Cas9 System) or DNA recombination technology (Cre-loxP system). Herein, we review the history of optogenetics and the latest Magnet System technology and introduce our recently developed photoactivatable Cre knock-in mice with temporal-, spatial-, and cell-specific accuracy.

DOI： 10.18926/AMO/63202

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Language：Japanese   Publisher：Japanese Pharmacological Society  

[Background] To achieve the disease modeling of skeletal dysplasia, human induced pluripotent stem cells (iPSCs) will be useful but the induction method for limb bud mesenchymal (LBM) cells, which can give rise to most of the future limb elements - bone, cartilage and tendon/ligament, has not been established. In this study, we developed the induction and expansion protocol of LBM cells from human iPSCs, and a high-throughput drug screening system using human LBM cells differentiated from iPSC which is derived from patients with skeletal dysplasia.

[Method] Paired-related homeobox 1 (PRRX1) serves as a marker for the LBM. To assess the induction efficiency of PRRX1 positive cells during each differentiation step, we established PRRX1-tdTomato reporter human iPSC line. Lateral plate mesoderm cells (LPM) derived from PRRX1-tdTomato reporter were used to establish the LBM-inducing method that recapitulates human developmental process. The chondrogenic capacity of expandable LBM (ExpLBM) cells was assessed using our two- or three- dimensional chondrogenic induction method (2DCI or 3DCI). In addition, ExpLBM cells differentiated from iPSCs derived from patients with type II collagenopathy (COL2pathy), one of the skeletal dysplasia arising from mutations in COL2A1, were used to develop high-throughput screening system.

[Results] By activating WNT signaling and inhibiting BMP/TGFb/headge hog signaling pathways, almost all LPM cells could be induced to PRRX1 positive LBM cells. Interestingly, we found the defined culture method that can not only stably expand LBM cells (ExpLBM) but also maintain their PRRX1 expression. ExpLBM formed Alcian Blue positive nodules under 2DCI condition and Safranin O positive cartilaginous particles under 3DCI condition. 2DCI-based high-throughput screening system found that several chemicals improved the chondrogenic capacity of ExpLBM derived from COL2pathy patient.

[Conclusion] ExpLBM cells will be a potential tool to study human bone development, cartilage regeneration and drug discovery using disease-specific human iPSCs.

DOI： 10.1254/jpssuppl.95.0_2-o-087

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Publishing type：Research paper (scientific journal)   Publisher：Wiley  

DOI： 10.1002/biof.1774

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/biof.1774

Language：English   Publishing type：Research paper (scientific journal)  

Current protocols for the differentiation of human pluripotent stem cells (hPSCs) into chondrocytes do not allow for the expansion of intermediate progenitors so as to prospectively assess their chondrogenic potential. Here we report a protocol that leverages PRRX1-tdTomato reporter hPSCs for the selective induction of expandable and ontogenetically defined PRRX1+ limb-bud-like mesenchymal cells under defined xeno-free conditions, and the prospective assessment of the cells' chondrogenic potential via the cell-surface markers CD90, CD140B and CD82. The cells, which proliferated stably and exhibited the potential to undergo chondrogenic differentiation, formed hyaline cartilaginous-like tissue commensurate to their PRRX1-expression levels. Moreover, we show that limb-bud-like mesenchymal cells derived from patient-derived induced hPSCs can be used to identify therapeutic candidates for type II collagenopathy and we developed a method to generate uniformly sized hyaline cartilaginous-like particles by plating the cells on culture dishes coated with spots of a zwitterionic polymer. PRRX1+ limb-bud-like mesenchymal cells could facilitate the mass production of chondrocytes and cartilaginous tissues for applications in drug screening and tissue engineering.

DOI： 10.1038/s41551-021-00778-x

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Language：Japanese   Publisher：(公社)日本整形外科学会  

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Language：English   Publishing type：Research paper (scientific journal)  

Lung adenocarcinoma (LUAD) is the most common types among lung cancers generally arising from terminal airway and understanding of multistep carcinogenesis is crucial to develop novel therapeutic strategy for LUAD. Here we used human induced pluripotent stem cells (hiPSCs) to establish iHER2-hiPSCs in which doxycycline induced the expression of the oncoprotein human epidermal growth factor receptor 2 (HER2)/ERBB2. Lung progenitors that differentiated from iHER2-hiPSCs, which expressed NKX2-1/TTF-1 known as a lung lineage maker, were cocultured with human fetal fibroblast and formed human lung organoids (HLOs) comprising alveolar type 2-like cells. HLOs that overexpressed HER2 transformed to tumor-like structures similar to atypical adenomatous hyperplasia, which is known for lung precancerous lesion and upregulated the activities of oncogenic signaling cascades such as RAS/RAF/MAPK and PI3K/AKT/mTOR. The degree of morphological irregularity and proliferation capacity were significantly higher in HLOs from iHER2-hiPSCs. Moreover, the transcriptome profile of the HLOs shifted from a normal lung tissue-like state to one characteristic of clinical LUAD with HER2 amplification. Our results suggest that hiPSC-derived HLOs may serve as a model to recapitulate the early tumorigenesis of LUAD and would provide new insights into the molecular basis of tumor initiation and progression.

DOI： 10.1002/ijc.33713

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T cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematologic malignancy with inferior outcome compared with that of B cell ALL. Here, we show that Runt-related transcription factor 2 (RUNX2) was upregulated in high-risk T-ALL with KMT2A rearrangements (KMT2A-R) or an immature immunophenotype. In KMT2A-R cells, we identified RUNX2 as a direct target of the KMT2A chimeras, where it reciprocally bound the KMT2A promoter, establishing a regulatory feed-forward mechanism. Notably, RUNX2 was required for survival of immature and KMT2A-R T-ALL cells in vitro and in vivo. We report direct transcriptional regulation of CXCR4 signaling by RUNX2, thereby promoting chemotaxis, adhesion, and homing to medullary and extramedullary sites. RUNX2 enabled these energy-demanding processes by increasing metabolic activity in T-ALL cells through positive regulation of both glycolysis and oxidative phosphorylation. Concurrently, RUNX2 upregulation increased mitochondrial dynamics and biogenesis in T-ALL cells. Finally, as a proof of concept, we demonstrate that immature and KMT2A-R T-ALL cells were vulnerable to pharmacological targeting of the interaction between RUNX2 and its cofactor CBFβ. In conclusion, we show that RUNX2 acts as a dependency factor in high-risk subtypes of human T-ALL through concomitant regulation of tumor metabolism and leukemic cell migration.

DOI： 10.1172/JCI141566

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Paired related homeobox 1 (PRRX1) is a marker of limb bud mesenchymal cells, and deficiency of p53 or Rb in Prrx1-positive cells induces osteosarcoma in several mouse models. However, the regulatory roles of PRRX1 in human osteosarcoma have not been defined. In this study, we performed PRRX1 immunostaining on 35 human osteosarcoma specimens to assess the correlation between PRRX1 level and overall survival. In patients with osteosarcoma, the expression level of PRRX1 positively correlated with poor prognosis or the ratio of lung metastasis. Additionally, we found PRRX1 expression on in 143B cells, a human osteosarcoma line with a high metastatic capacity. Downregulation of PRRX1 not only suppressed proliferation and invasion but also increased the sensitivity to cisplatin and doxorubicin. When 143B cells were subcutaneously transplanted into nude mice, PRRX1 knockdown decreased tumor sizes and rates of lung metastasis. Interestingly, forskolin, a chemical compound identified by Connectivity Map analysis using RNA expression signatures during PRRX1 knockdown, decreased tumor proliferation and cell migration to the same degree as PRRX1 knockdown. These results demonstrate that PRRX1 promotes tumor malignancy in human osteosarcoma.

DOI： 10.1016/j.tranon.2020.100960

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Medication-related osteonecrosis of the jaw (MRONJ) is a severe pathological condition associated mainly with the long-term administration of bone resorption inhibitors, which are known to induce suppression of osteoclast activity and bone remodeling. Bone Morphogenetic Protein (BMP)-2 is known to be a strong inducer of bone remodeling, by directly regulating osteoblast differentiation and osteoclast activity. This study aimed to evaluate the effects of BMP-2 adsorbed onto beta-tricalcium phosphate (β-TCP), which is an osteoinductive bioceramic material and allows space retention, on the prevention and treatment of MRONJ in mice. Tooth extraction was performed after 3 weeks of zoledronate (ZA) and cyclophosphamide (CY) administration. For prevention studies, BMP-2/β-TCP was transplanted immediately after tooth extraction, and the mice were administered ZA and CY for an additional 4 weeks. The results showed that while the tooth extraction socket was mainly filled with a sparse tissue in the control group, bone formation was observed at the apex of the tooth extraction socket and was filled with a dense connective tissue rich in cellular components in the BMP-2/β-TCP transplanted group. For treatment studies, BMP-2/β-TCP was transplanted 2 weeks after tooth extraction, and bone formation was followed up for the subsequent 4 weeks under ZA and CY suspension. The results showed that although the tooth extraction socket was mainly filled with soft tissue in the control group, transplantation of BMP-2/β-TCP could significantly accelerate bone formation, as shown by immunohistochemical analysis for osteopontin, and reduce the bone necrosis in tooth extraction sockets. These data suggest that the combination of BMP-2/β-TCP could become a suitable therapy for the management of MRONJ.

DOI： 10.3390/ijms21197028

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Core Binding Factors (CBFs) are a small group of heterodimeric transcription factor complexes composed of DNA binding proteins, RUNXs, and a non-DNA binding protein, CBFB. The LH surge increases the expression of Runx1 and Runx2 in ovulatory follicles, while Cbfb is constitutively expressed. To investigate the physiological significance of CBFs, we generated a conditional mutant mouse model in which granulosa cell expression of Runx2 and Cbfb was deleted by the Esr2Cre. Female Cbfbflox/flox;Esr2cre/+;Runx2flox/flox mice were infertile; follicles developed to the preovulatory follicle stage but failed to ovulate. RNA-seq analysis of mutant mouse ovaries collected at 11 h post-hCG unveiled numerous CBFs-downstream genes that are associated with inflammation, matrix remodeling, wnt signaling, and steroid metabolism. Mutant mice also failed to develop corpora lutea, as evident by the lack of luteal marker gene expression, marked reduction of vascularization, and excessive apoptotic staining in unruptured poorly luteinized follicles, consistent with dramatic reduction of progesterone by 24 h after hCG administration. The present study provides in vivo evidence that CBFs act as essential transcriptional regulators of both ovulation and luteinization by regulating the expression of key genes that are involved in inflammation, matrix remodeling, cell differentiation, vascularization, and steroid metabolisms in mice.

DOI： 10.1038/s41598-020-64257-0

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The Cre-loxP recombination system is widely used to generate genetically modified mice for biomedical research. Recently, a highly efficient photoactivatable Cre (PA-Cre) based on reassembly of split Cre fragments has been established. This technology enables efficient DNA recombination that is activated upon blue light illumination with spatiotemporal precision. In this study, we generated a tTA-dependent photoactivatable Cre-loxP recombinase knock-in mouse model (TRE-PA-Cre mice) using a CRISPR/Cas9 system. These mice were crossed with ROSA26-tdTomato mice (Cre reporter mouse) to visualize DNA recombination as marked by tdTomato expression. We demonstrated that external noninvasive LED blue light illumination allows efficient DNA recombination in the liver of TRE-PA-Cre:ROSA26-tdTomato mice transfected with tTA expression vectors using hydrodynamic tail vein injection. The TRE-PA-Cre mouse established here promises to be useful for optogenetic genome engineering in a noninvasive, spatiotemporal, and cell-type specific manner in vivo.

DOI： 10.1016/j.bbrc.2020.03.015

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The osteoblast differentiation capacity of skeletal stem cells (SSCs) must be tightly regulated, as inadequate bone formation results in low bone mass and skeletal fragility, and over-exuberant osteogenesis results in heterotopic ossification (HO) of soft tissues. RUNX2 is essential for tuning this balance, but the mechanisms of posttranslational control of RUNX2 remain to be fully elucidated. Here, we identify that a CK2/HAUSP pathway is a key regulator of RUNX2 stability, as Casein kinase 2 (CK2) phosphorylates RUNX2, recruiting the deubiquitinase herpesvirus-associated ubiquitin-specific protease (HAUSP), which stabilizes RUNX2 by diverting it away from ubiquitin-dependent proteasomal degradation. This pathway is important for both the commitment of SSCs to osteoprogenitors and their subsequent maturation. This CK2/HAUSP/RUNX2 pathway is also necessary for HO, as its inhibition blocked HO in multiple models. Collectively, active deubiquitination of RUNX2 is required for bone formation and this CK2/HAUSP deubiquitination pathway offers therapeutic opportunities for disorders of inappropriate mineralization.

DOI： 10.1038/s41467-020-16038-6

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Language：Japanese   Publisher：(一社)中部日本整形外科災害外科学会  

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In drug addiction, environmental stimuli previously associated with cocaine use readily elicit cocaine-associated memories, which persist long after abstinence and trigger cocaine craving and consumption. Although previous studies suggest that the medial prefrontal cortex (mPFC) is involved in the expression of cocaine-addictive behaviors, it remains unclear whether excitatory and inhibitory neurons in the mPFC are causally related to the formation and retrieval of cocaine-associated memories. To address this issue, we used the designer receptors exclusively activated by designer drugs (DREADD) technology combined with a cocaine-induced conditioned place preference (CPP) paradigm. We suppressed mPFC neuronal activity in a cell-type- and timing-dependent manner. C57BL/6J wild-type mice received bilateral intra-mPFC infusion of an adeno-associated virus (AAV) expressing inhibitory DREADD (hM4Di) under the control of CaMKII promotor to selectively suppress mPFC pyramidal neurons. GAD67-Cre mice received bilateral intra-mPFC infusion of a Cre-dependent AAV expressing hM4Di to specifically silence GABAergic neurons. Chemogenetic suppression of mPFC pyramidal neurons significantly attenuated both the acquisition and expression of cocaine CPP, while suppression of mPFC GABAergic neurons affected neither the acquisition nor expression of cocaine CPP. Moreover, chemogenetic inhibition of mPFC glutamatergic neurons did not affect the acquisition and expression of lithium chloride-induced conditioned place aversion. These results suggest that the activation of glutamatergic, but not GABAergic, neurons in the mPFC mediates both the formation and retrieval of cocaine-associated memories.

DOI： 10.1111/adb.12723

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Language：Japanese   Publisher：(株)羊土社  

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Global gene deletion studies have established that Runt-related transcription factor-2 (Runx2) is essential during skeletogenesis for osteoblastic differentiation in both intramembranous and endochondral ossification processes. However, the postnatal significance of Runx2 in vivo is poorly understood because a global Runx2 deletion causes perinatal lethality. In this study, we generated tamoxifen-induced Runx2 global deficient mice by crossing Runx2flox mice with ROSA26-CreERT2 mice (Rosa26-CreERT2; Runx2flox/flox). Four-week-old mice were intraperitoneally treated with tamoxifen for five consecutive days, sacrificed, and analyzed six weeks after tamoxifen administration. Deletion of Runx2 led to low bone mass, which is associated with decreased bone formation and bone resorption as well as excessive bone marrow adiposity. Collectively, postnatal Runx2 absolutely plays an important role in maintaining the homeostasis of bone tissues not only in bone mass, but also in the bone marrow environment.

DOI： 10.1016/j.bbrc.2019.07.014

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Language：Japanese   Publisher：(一社)日本骨代謝学会  

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Runx2 plays an essential role in embryonic disc tissue development in mice. However, the role of runt-related transcription factor 2 (Runx2) in postnatal disc tissue growth and development has not been defined. In the present studies, we generated Runx2 conditional knockout (KO) mice (Runx2Agc1ER ), in which Runx2 was deleted in Aggrecan-expressing cells in disc tissue at postnatal 2-weeks of age. We then analyzed changes in disc tissue growth and development using histology and immunohistochemical methods in 3-month-old mice. We found that large vacuolated notochordal cells were accumulated in the nucleus pulposus (NP) in Runx2 KO mice. The growth plate cartilage tissue in the disc was thicker in Runx2 KO mice. We also found a significant upregulation of Indian hedgehog (Ihh) expression in the cells in NP cells and in annulus fibrosus cells of Runx2 KO mice. These results demonstrated that Runx2 may play an important role in postnatal disc tissue development through interacting with Ihh signaling.

DOI： 10.1002/jcp.27410

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

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In drug addiction, environmental stimuli previously associated with cocaine use readily elicit cocaine-associated memories, which persist long after abstinence and trigger cocaine craving and consumption. Although previous studies suggest that the medial prefrontal cortex (mPFC) is involved in the expression of cocaine-addictive behaviors, it remains unclear whether excitatory and inhibitory neurons in the mPFC are causally related to the formation and retrieval of cocaine-associated memories. To address this issue, we used the designer receptors exclusively activated by designer drugs (DREADD) technology combined with a cocaine-induced conditioned place preference (CPP) paradigm. We suppressed mPFC neuronal activity in a cell-type- and timing-dependent manner. C57BL/6J wild-type mice received bilateral intra-mPFC infusion of an adeno-associated virus (AAV) expressing inhibitory DREADD (hM4Di) under the control of CaMKII promotor to selectively suppress mPFC pyramidal neurons. GAD67-Cre mice received bilateral intra-mPFC infusion of a Cre-dependent AAV expressing hM4Di to specifically silence GABAergic neurons. Chemogenetic suppression of mPFC pyramidal neurons significantly attenu

DOI： 10.1111/adb.12723

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DOI： 10.1002/jbmr.3598

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Several malignant tumors and fibrotic diseases are associated with PDGFRβ overexpression and excessive signaling, making this receptor attractive for molecular targeting and imaging approaches. A series of benzo[d]imidazole-quinoline derivatives were designed and synthesized to develop radioiodinated compounds as PDGFRβ-specific imaging probes. The structure activity relationship (SAR) evaluation of the designed compounds was performed. Among them, 2-[5-(2-methoxyethoxy)-1H-benzo[d]imidazol-1-yl]-8-(piperazin-1-yl)quinoline (5a) and 4-{2-[5-(2-methoxyethoxy)-1H-benzo[d]imidazol-1-yl]quinolin-8-yl}morpholine (5d) exhibited a relatively high PDGFRβ-TK inhibitory potency, whereas iodinated 5a derivative 5-iodo-2-[5-(2-methoxyethoxy)-1H-benzo[d]imidazol-1-yl]-8-(piperazin-1-yl)quinoline (8) exhibited a superior inhibitory potency as PDGFRβ inhibitor than iodinated 5d derivative 4-{5-iodo-2-[5-(2-methoxyethoxy)-1H-benzo[d]imidazol-1-yl]quinolin-8-yl}morpholine (11). Furthermore, [125I]8 and [125I]11 were synthesized and evaluated for PDGFRβ radioligand ability, both in vitro and in vivo. Cellular uptake experiments showed that [125I]8 had a higher uptake in BxPC3-luc cells as PDGFRβ-positive cells than [125I]11. Incubation of [125I]8 after pretreatment of PDGFRβ ligands significantly reduced the uptake of [125I]8. In biodistribution experiments using tumor-bearing mice, [125I]8 accumulation in the tumor 1 h postinjection was higher than that of the benzo[d]imidazol-quinoline derivative [125I]IIQP, used in our previous research. These results indicate that [125I]8 could be a promising PDGFRβ imaging agent. Although its clinical application requires further structural modifications, the results obtained in this research may be useful for the development of PDGFRβ-specific radioligands.

DOI： 10.1016/j.bmc.2018.12.016

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DOI： 10.1254/fpj.153.67

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Language：Japanese   Publishing type：Research paper (scientific journal)  

The mesenchymal stem cell (MSC) is a type of tissue stem cell. In clinical studies, cultured MSCs have shown important therapeutic effects on diseases via both the reduction of neurological defects and the regulation of immune responses. However, in vivo MSC localization, function, and properties are poorly understood; therefore, the molecular understanding of MSC hierarchy is less advanced compared to hematopoietic stem cell hierarchy. Runt-related transcription factor 2 (Runx2) is an essential transcriptional regulator of osteoblast differentiation from MSCs. Runx2 deficiency in Paired-related homeobox 1 (Prrx1)-derived cells (Runx2Prrx1-/- mice) results in defective intramembranous ossification. Double-positive cells for Prrx1-GFP, and stem cell antigen-1 (Sca1) (Prrx1+Sca1+ cells) in the calvaria, express Runx2 at lower levels, and are more homogeneous and primitive compared with Prrx1+Sca1- cells. Our results suggest that osteoblast differentiation in vivo may begin at the Prrx1+Sca1+ MSC stage, with sequential progression to Prrx1+Sca1- cells, followed by Osterix+Prrx1-Sca1- osteoblast precursors, which eventually form mature α1(I)-collagen+ osteoblasts. This research will enable us to better understand the in vivo molecular biology features of MSCs, leading to their therapeutic applications for tissue repair and regeneration.

DOI： 10.1248/yakushi.18-00173-4

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The pathophysiological role of mammalian target of rapamycin complex 1 (mTORC1) in neurodegenerative diseases is established, but possible therapeutic targets responsible for its activation in neurons must be explored. Here we identified solute carrier family 38a member 1 (SNAT1, Slc38a1) as a positive regulator of mTORC1 in neurons. Slc38a1 flox/flox and Synapsin I-Cre mice were crossed to generate mutant mice in which Slc38a1 was selectively deleted in neurons. Measurement of 2,3,5-triphenyltetrazolium chloride (TTC) or the MAP2-negative area in a mouse model of middle cerebral artery occlusion (MCAO) revealed that Slc38a1 deficiency decreased infarct size. We found a transient increase in the phosphorylation of p70S6k1 (pp70S6k1) and a suppressive effect of rapamycin on infarct size in MCAO mice. Autophagy inhibitors completely mitigated the suppressive effect of SNAT1 deficiency on neuronal cell death under in vitro stroke culture conditions. These results demonstrate that SNAT1 promoted ischemic brain damage via mTOR-autophagy system.

DOI： 10.1038/s42003-019-0582-4

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DOI： 10.1248/yakushi.18-00173-F

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Glioblastoma (GBM) is the most aggressive and lethal form of brain tumor. However, therapeutic strategies against malignant gliomas have not been completely established. Runt-related transcription factor 2 (Runx2) is an essential gene for skeletal development but its regulatory role in the malignant progression of glioma remains unclear. Here we investigated expression levels of RUNX2 in glioma tissues and its regulatory effects on aberrant growth of glioma cells. RUNX2 mRNA levels were higher in GBM tissues than that of normal brains or low-grade gliomas. RUNX2 protein was detected in five out of seven human GBM cell lines and its level was positively correlated with proliferative capacity. Stable transduction of dominant-negative Runx2 in rat-derived C6 glioma cells not only inhibited the promoter activity containing Runx2 response element, but also decreased mRNA expression levels of Runx2 target genes, such as Mmp13 and Spp1, as well as the proliferative capacity. Furthermore, transient introduction of Runx2-targeted siRNAs into C6 glioma cells significantly decreased mRNA expression levels of Mmp13 and Spp1 and the proliferative capacity. Furthermore, Runx2 knockdown suppressed both Ccnd1 mRNA expression and activation of the Ccnd1 promoter by forskolin, a PKA-activating reagent, in C6 glioma cells. Our results demonstrate that cross-talk between cAMP/PKA signaling and RUNX2 promotes a malignant phenotype of glioma cells.

DOI： 10.1007/s11064-018-2626-4

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Erk5 belongs to the mitogen-activated protein kinase (MAPK) family. Following its phosphorylation by Mek5, Erk5 modulates several signaling pathways in a number of cell types. In this study, we demonstrated that Erk5 inactivation in mesenchymal cells causes abnormalities in skeletal development by inducing Sox9, an important transcription factor of skeletogenesis. We further demonstrate that Erk5 directly phosphorylates and activates Smurf2 (a ubiquitin E3 ligase) at Thr249, which promotes the proteasomal degradation of Smad proteins and phosphorylates Smad1 at Ser206 in the linker region known to trigger its proteasomal degradation by Smurf1. Smads transcriptionally activated the expression of Sox9 in mesenchymal cells. Accordingly, removal of one Sox9 allele in mesenchymal cells from Erk5-deficient mice rescued some abnormalities of skeletogenesis. These findings highlight the importance of the Mek5-Erk5-Smurf-Smad-Sox9 axis in mammalian skeletogenesis.

DOI： 10.1242/dev.164004

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Platelet-derived growth factor receptor beta (PDGFRβ) affects in numerous human cancers and has been recognized as a promising molecular target for cancer therapies. The overexpression of PDGFRβ could be a biomarker for cancer diagnosis. Radiolabeled ligands having high affinity for the molecular target could be useful tools for the imaging of overexpressed receptors in tumors. In this study, we aimed to develop radiobrominated PDGFRβ ligands and evaluate their effectiveness as PDGFRβ imaging probes. The radiolabeled ligands were designed by modification of 1-{2-[5-(2-methoxyethoxy)-1H- benzo[d]imidazol-1-yl]quinolin-8-yl}piperidin-4-amine (1), which shows selective inhibition profile toward PDGFRβ. The bromine atom was introduced directly into C-5 of the quinoline group of 1, or indirectly by the conjugation of 1 with the 3-bromo benzoyl group. [77Br]1-{5-Bromo-2-[5-(2-methoxyethoxy)-1H-benzo[d]imidazol-1-yl]quinoline-8-yl}piperidin-4-amine ([77Br]2) and [77Br]-N-3-bromobenzoyl-1-{2-[5-(2-methoxyethoxy)-1H-benzo[d]imidazol-1-yl]quinolin-8-yl}-piperidin-4-amine ([77Br]3) were prepared using a bromodestannylation reaction. In a cellular uptake study, [77Br]2 and [77Br]3 more highly accumulatd in BxPC3-luc cells (PDGFRβ-positive) than in MCF7 cells (PDGFRβ-negative), and their accumulation was significantly reduced by pretreatment with inhibitors. In biodistribution experiments, [77Br]2 accumulation was higher than [77Br]3 accumulation at 1 h postinjection. These findings suggest that [76Br]2 is more promising for positron emission tomography (PET) imaging of PDGFRβ than [76Br]3.

DOI： 10.1038/s41598-018-28529-0

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A vast number of long-noncoding RNAs (lncRNA) are found expressed in human cells, which RNAs have been developed along with human evolution. However, the physiological functions of these lncRNAs remain mostly unknown. In the present study, we for the first time uncovered the fact that one of such lncRNAs plays a significant role in the differentiation of chondrocytes and, possibly, of osteoblasts differentiated from mesenchymal stem cells, which cells eventually construct the human skeleton. The urothelial cancer-associated 1 (UCA1) lncRNA is known to be associated with several human malignancies. Firstly, we confirmed that UCA1 was expressed in normal human chondrocytes, as well as in a human chondrocytic cell line; whereas it was not detected in human bone marrow mesenchymal stem cells (hBMSCs). Of note, although UCA1 expression was undetectable in hBMSCs, it was markedly induced along with the differentiation toward chondrocytes, suggesting its critical role in chondrogenesis. Consistent with this finding, silencing of the UCA1 gene significantly repressed the expression of chondrogenic genes in human chondrocytic cells. UCA1 gene silencing and hyper-expression also had a significant impact on the osteoblastic phenotype in a human cell line. Finally, forced expression of UCA1 in a murine chondrocyte precursor, which did not possess a UCA1 gene, overdrove its differentiation into chondrocytes. These results indicate a physiological and important role of this lncRNA in the skeletal development of humans, who require more sustained endochondral ossification and osteogenesis than do smaller vertebrates.

DOI： 10.1002/jcp.26285

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Language：Japanese   Publisher：日本結合組織学会  

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Core binding factor β (CBFβ) is a non-DNA-binding partner of all RUNX proteins and critical for transcription activity of CBF transcription factors (RUNXs/CBFβ). In the ovary, the expression of Runx1 and Runx2 is highly induced by the luteinizing hormone (LH) surge in ovulatory follicles, whereas Cbfb is constitutively expressed. To investigate the physiological significance of CBFs in the ovary, the current study generated two different conditional mutant mouse models in which granulosa cell expression of Cbfb and Runx2 was reduced by Cre recombinase driven by an Esr2 promoter. Cbfbgc-/- and Cbfbgc-/- × Runx2gc+/- mice exhibited severe subfertility and infertility, respectively. In the ovaries of both mutant mice, follicles develop normally, but the majority of preovulatory follicles failed to ovulate either in response to human chorionic gonadotropin administration in pregnant mare serum gonadotropin-primed immature animals or after the LH surge at 5 months of age. Morphological and physiological changes in the corpus luteum of these mutant mice revealed the reduced size, progesterone production, and vascularization, as well as excessive lipid accumulation. In granulosa cells of periovulatory follicles and corpora lutea of these mice, the expression of Edn2, Ptgs1, Lhcgr, Sfrp4, Wnt4, Ccrl2, Lipg, Saa3, and Ptgfr was also drastically reduced. In conclusion, the current study provided in vivo evidence that CBFβ plays an essential role in female fertility by acting as a critical cofactor of CBF transcription factor complexes, which regulate the expression of specific key ovulatory and luteal genes, thus coordinating the ovulatory process and luteal development/function in mice.

DOI： 10.1210/en.2018-00011

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DOI： 10.1038/s41598-018-21000-0

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DOI： 10.1523/JNEUROSCI.3639-16.2017

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DOI： 10.1016/j.bmc.2017.08.025

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DOI： 10.1038/s41598-017-02490-w

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DOI： 10.1002/jbmr.3053

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DOI： 10.1016/j.bbrep.2015.09.021

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DOI： 10.1016/j.neuint.2014.04.010

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Language：English   Publisher：The Japanese Pharmacological Society  

DOI： 10.1254/fpj.144.305

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Other Link： http://search.jamas.or.jp/link/ui/2015075200

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DOI： 10.1002/jbmr.1945

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