研究者詳細 - 王　英正

論文 - 王　英正

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左心低形成症候群に対する心臓内幹細胞自家移植療法第I相臨床試験18ヵ月長期成績

石神修大, 樽井俊, 逢坂大樹, 後藤拓弥, 奥山倫弘, 小林純子, 藤井泰宏, 黒子洋介, 川畑拓也, 小谷恭弘, 吉積功, 新井禎彦, 笠原真悟, 佐野俊二, 王英正

日本心臓血管外科学会雑誌 44 ( Suppl. ) 185 - 185 2015年1月

MURC/Cavin-4 facilitates recruitment of ERK to caveolae and concentric cardiac hypertrophy induced by α1-adrenergic receptors. 国際誌

Takehiro Ogata, Daisuke Naito, Naohiko Nakanishi, Yukiko K Hayashi, Takuya Taniguchi, Kotaro Miyagawa, Tetsuro Hamaoka, Naoki Maruyama, Satoaki Matoba, Koji Ikeda, Hiroyuki Yamada, Hidemasa Oh, Tomomi Ueyama

Proceedings of the National Academy of Sciences of the United States of America 111 ( 10 ) 3811 - 6 2014年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

The actions of catecholamines on adrenergic receptors (ARs) induce sympathetic responses, and sustained activation of the sympathetic nervous system results in disrupted circulatory homeostasis. In cardiomyocytes, α1-ARs localize to flask-shaped membrane microdomains known as "caveolae." Caveolae require both caveolin and cavin proteins for their biogenesis and function. However, the functional roles and molecular interactions of caveolar components in cardiomyocytes are poorly understood. Here, we showed that muscle-restricted coiled-coil protein (MURC)/Cavin-4 regulated α1-AR-induced cardiomyocyte hypertrophy through enhancement of ERK1/2 activation in caveolae. MURC/Cavin-4 was expressed in the caveolae and T tubules of cardiomyocytes. MURC/Cavin-4 overexpression distended the caveolae, whereas MURC/Cavin-4 was not essential for their formation. MURC/Cavin-4 deficiency attenuated cardiac hypertrophy induced by α1-AR stimulation in the presence of caveolae. Interestingly, MURC/Cavin-4 bound to α1A- and α1B-ARs as well as ERK1/2 in caveolae, and spatiotemporally modulated MEK/ERK signaling in response to α1-AR stimulation. Thus, MURC/Cavin-4 facilitates ERK1/2 recruitment to caveolae and efficient α1-AR signaling mediated by caveolae in cardiomyocytes, which provides a unique insight into the molecular mechanisms underlying caveola-mediated signaling in cardiac hypertrophy.

DOI： 10.1073/pnas.1315359111

Directed differentiation of patient-specific induced pluripotent stem cells identifies the transcriptional repression and epigenetic modification of NKX2-5, HAND1, and NOTCH1 in hypoplastic left heart syndrome. 国際誌

Junko Kobayashi, Masashi Yoshida, Suguru Tarui, Masataka Hirata, Yusuke Nagai, Shingo Kasahara, Keiji Naruse, Hiroshi Ito, Shunji Sano, Hidemasa Oh

PloS one 9 ( 7 ) e102796 2014年

記述言語：英語掲載種別：研究論文（学術雑誌）

The genetic basis of hypoplastic left heart syndrome (HLHS) remains unknown, and the lack of animal models to reconstitute the cardiac maldevelopment has hampered the study of this disease. This study investigated the altered control of transcriptional and epigenetic programs that may affect the development of HLHS by using disease-specific induced pluripotent stem (iPS) cells. Cardiac progenitor cells (CPCs) were isolated from patients with congenital heart diseases to generate patient-specific iPS cells. Comparative gene expression analysis of HLHS- and biventricle (BV) heart-derived iPS cells was performed to dissect the complex genetic circuits that may promote the disease phenotype. Both HLHS- and BV heart-derived CPCs were reprogrammed to generate disease-specific iPS cells, which showed characteristic human embryonic stem cell signatures, expressed pluripotency markers, and could give rise to cardiomyocytes. However, HLHS-iPS cells exhibited lower cardiomyogenic differentiation potential than BV-iPS cells. Quantitative gene expression analysis demonstrated that HLHS-derived iPS cells showed transcriptional repression of NKX2-5, reduced levels of TBX2 and NOTCH/HEY signaling, and inhibited HAND1/2 transcripts compared with control cells. Although both HLHS-derived CPCs and iPS cells showed reduced SRE and TNNT2 transcriptional activation compared with BV-derived cells, co-transfection of NKX2-5, HAND1, and NOTCH1 into HLHS-derived cells resulted in synergistic restoration of these promoters activation. Notably, gain- and loss-of-function studies revealed that NKX2-5 had a predominant impact on NPPA transcriptional activation. Moreover, differentiated HLHS-derived iPS cells showed reduced H3K4 dimethylation as well as histone H3 acetylation but increased H3K27 trimethylation to inhibit transcriptional activation on the NKX2-5 promoter. These findings suggest that patient-specific iPS cells may provide molecular insights into complex transcriptional and epigenetic mechanisms, at least in part, through combinatorial expression of NKX2-5, HAND1, and NOTCH1 that coordinately contribute to cardiac malformations in HLHS.

DOI： 10.1371/journal.pone.0102796

疾患特異的iPS細胞を用いた左心低形成症候群における心臓発生異常の解明

小林純子, 樽井俊, 平田昌敬, 川畑拓也, 黒子洋介, 立石篤史, 吉積功, 新井禎彦, 笠原真悟, 佐野俊二, 王英正

日本外科学会雑誌 114 ( 臨増2 ) 415 - 415 2013年3月

先天性心疾患の疾患特異的iPS細胞の樹立と左心低形成症候群の心臓発生異常の解明

小林純子, 樽井俊, 平田昌敬, 川畑拓也, 黒子洋介, 立石篤史, 吉積功, 新井禎彦, 笠原真悟, 佐野俊二, 王英正

日本心臓血管外科学会雑誌 42 ( Suppl. ) 274 - 274 2013年2月

先天性心疾患患者由来の心臓内幹細胞を用いた疾患特異的ヒトiPS細胞の樹立と機能解析

小林純子, 樽井俊, 平田昌敬, 川畑拓也, 黒子洋介, 立石篤史, 吉積功, 新井禎彦, 笠原真悟, 佐野俊二, 王英正

日本小児循環器学会雑誌 28 ( Suppl. ) s145 - s145 2012年6月

Molecular genetic and functional characterization implicate muscle-restricted coiled-coil gene (MURC) as a causal gene for familial dilated cardiomyopathy. 国際誌

Gabriela Rodriguez, Tomomi Ueyama, Takehiro Ogata, Grazyna Czernuszewicz, Yanli Tan, Gerald W Dorn 2nd, Roberta Bogaev, Katsuya Amano, Hidemasa Oh, Hiroaki Matsubara, James T Willerson, Ali J Marian

Circulation. Cardiovascular genetics 4 ( 4 ) 349 - 58 2011年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Dilated cardiomyopathy (DCM) and hypertrophic cardiomyopathy (HCM) are classic forms of systolic and diastolic heart failure, respectively. Mutations in genes encoding sarcomere and cytoskeletal proteins are major causes of HCM and DCM. MURC, encoding muscle-restricted coiled-coil, a Z-line protein, regulates cardiac function in mice. We investigated potential causal role of MURC in human cardiomyopathies. METHODS AND RESULTS: We sequenced MURC in 1199 individuals, including 383 probands with DCM, 307 with HCM, and 509 healthy control subjects. We found 6 heterozygous DCM-specific missense variants (p.N128K, p.R140W, p.L153P, p.S307T, p.P324L, and p.S364L) in 8 unrelated probands. Variants p.N128K and p.S307T segregated with inheritance of DCM in small families (χ(2)=8.5, P=0.003). Variants p.N128K, p.R140W, p.L153P, and p.S364L were considered probably or possibly damaging. Variant p.P324L recurred in 3 independent probands, including 1 proband with a TPM1 mutation (p.M245T). A deletion variant (p.L232-R238del) was present in 3 unrelated HCM probands, but it did not segregate with HCM in a family who also had a MYH7 mutation (p.L907V). The phenotype in mutation carriers was notable for progressive heart failure leading to heart transplantation in 4 patients, conduction defects, and atrial arrhythmias. Expression of mutant MURC proteins in neonatal rat cardiac myocytes transduced with recombinant adenoviruses was associated with reduced RhoA activity, lower mRNA levels of hypertrophic markers and smaller myocyte size as compared with wild-type MURC. CONCLUSIONS: MURC mutations impart loss-of-function effects on MURC functions and probably are causal variants in human DCM. The causal role of a deletion mutation in HCM is uncertain.

DOI： 10.1161/CIRCGENETICS.111.959866

PARM-1 is an endoplasmic reticulum molecule involved in endoplasmic reticulum stress-induced apoptosis in rat cardiac myocytes. 国際誌

Koji Isodono, Tomosaburo Takahashi, Hiroko Imoto, Naohiko Nakanishi, Takehiro Ogata, Satoshi Asada, Atsuo Adachi, Tomomi Ueyama, Hidemasa Oh, Hiroaki Matsubara

PloS one 5 ( 3 ) e9746 2010年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

To identify novel transmembrane and secretory molecules expressed in cardiac myocytes, signal sequence trap screening was performed in rat neonatal cardiac myocytes. One of the molecules identified was a transmembrane protein, prostatic androgen repressed message-1 (PARM-1). While PARM-1 has been identified as a gene induced in prostate in response to castration, its function is largely unknown. Our expression analysis revealed that PARM-1 was specifically expressed in hearts and skeletal muscles, and in the heart, cardiac myocytes, but not non-myocytes expressed PARM-1. Immunofluorescent staining showed that PARM-1 was predominantly localized in endoplasmic reticulum (ER). In Dahl salt-sensitive rats, high-salt diet resulted in hypertension, cardiac hypertrophy and subsequent heart failure, and significantly stimulated PARM-1 expression in the hearts, with a concomitant increase in ER stress markers such as GRP78 and CHOP. In cultured cardiac myocytes, PARM-1 expression was stimulated by proinflammatory cytokines, but not by hypertrophic stimuli. A marked increase in PARM-1 expression was observed in response to ER stress inducers such as thapsigargin and tunicamycin, which also induced apoptotic cell death. Silencing PARM-1 expression by siRNAs enhanced apoptotic response in cardiac myocytes to ER stresses. PARM-1 silencing also repressed expression of PERK and ATF6, and augmented expression of CHOP without affecting IRE-1 expression and JNK and Caspase-12 activation. Thus, PARM-1 expression is induced by ER stress, which plays a protective role in cardiac myocytes through regulating PERK, ATF6 and CHOP expression. These results suggested that PARM-1 is a novel ER transmembrane molecule involved in cardiac remodeling in hypertensive heart disease.

DOI： 10.1371/journal.pone.0009746

Stem cell engineering for cardiac tissue regeneration. 国際誌

Masashi Yoshida, Hidemasa Oh

Cardiology 115 ( 3 ) 191 - 3 2010年

Deficiency of nectin-2 leads to cardiac fibrosis and dysfunction under chronic pressure overload. 国際誌

Seimi Satomi-Kobayashi, Tomomi Ueyama, Steffen Mueller, Ryuji Toh, Tomoya Masano, Tsuyoshi Sakoda, Yoshiyuki Rikitake, Jun Miyoshi, Hiroaki Matsubara, Hidemasa Oh, Seinosuke Kawashima, Ken-ichi Hirata, Yoshimi Takai

Hypertension (Dallas, Tex. : 1979) 54 ( 4 ) 825 - 31 2009年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

The intercalated disc, a cell-cell contact site between neighboring cardiac myocytes, plays an important role in maintaining the homeostasis of the heart by transmitting electric and mechanical signals. Changes in the architecture of the intercalated disc have been observed in dilated cardiomyopathy. Among cell-cell junctions in the intercalated disc, adherens junctions are involved in anchoring myofibrils and transmitting force. Nectins are Ca(2+)-independent, immunoglobulin-like cell-cell adhesion molecules that exist in adherens junctions. However, the role of nectins in cardiac homeostasis and integrity of the intercalated disc are unknown. Among the isoforms of nectins, nectin-2 and -4 were expressed at the intercalated disc in the heart. Nectin-2-knockout mice showed normal cardiac structure and function under physiological conditions. Four weeks after banding of the ascending aorta, cardiac function was significantly impaired in nectin-2-knockout mice compared with wild-type mice, although both nectin-2-knockout and wild-type mice developed similar degrees of cardiac hypertrophy. Banded nectin-2-knockout mice displayed cardiac fibrosis more evidently than banded wild-type mice. The disruption of the intercalated discs and disorganized myofibrils were observed in banded nectin-2-knockout mice. Furthermore, the number of apoptotic cardiac myocytes was increased in banded nectin-2-knockout mice. In the hearts of banded nectin-2-knockout mice, Akt remained at lower phosphorylation levels until 2 weeks after banding, whereas c-Jun N-terminal kinase and p38 mitogen-activated protein kinase were highly phosphorylated compared with those of wild-type mice. These results indicate that nectin-2 is required to maintain structure and function of the intercalated disc and protects the heart from pressure-overload-induced cardiac dysfunction.

DOI： 10.1161/HYPERTENSIONAHA.109.130443

心臓再生医療の現状と将来

竹原有史, 天野克也, 高橋知三郎, 王英正, 松原弘明

日本内科学会雑誌 98 ( 2 ) 343 - 350 2009年2月

記述言語：日本語出版者・発行元：The Japanese Society of Internal Medicine

循環器領域における再生医療とは血管新生とともに，最終的には心筋再生が目標である．梗塞の大きな急性心筋梗塞，再発性心不全を繰り返す難治性心不全患者が対象となる心臓再生医療には，現在まで様々なアプローチがなされてきたが，真に有効な治療法は見いだせていない．サイトカインを中心とした非細胞療法の使用法，適応決定や，骨髄細胞・骨格筋芽細胞から新たな可能性を求めて心筋幹細胞やiPS細胞等の開発も急務である．<br>

DOI： 10.2169/naika.98.343

その他リンク： https://jlc.jst.go.jp/DN/JALC/00326486151?from=CiNii

Controlled delivery of basic fibroblast growth factor promotes human cardiosphere-derived cell engraftment to enhance cardiac repair for chronic myocardial infarction. 国際誌

Naofumi Takehara, Yoshiaki Tsutsumi, Kento Tateishi, Takehiro Ogata, Hideo Tanaka, Tomomi Ueyama, Tomosaburo Takahashi, Tetsuro Takamatsu, Masanori Fukushima, Masashi Komeda, Masaaki Yamagishi, Hitoshi Yaku, Yasuhiko Tabata, Hiroaki Matsubara, Hidemasa Oh

Journal of the American College of Cardiology 52 ( 23 ) 1858 - 1865 2008年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVES: This study was designed to determine whether controlled release of basic fibroblast growth factor (bFGF) might improve human cardiosphere-derived cell (hCDC) therapy in a pig model of chronic myocardial infarction. BACKGROUND: Current cell therapies for cardiac repair are limited by loss of the transplanted cells and poor differentiation. METHODS: We conducted 2 randomized, placebo-controlled studies in immunosuppressed pigs with anterior myocardial infarctions. Four weeks after coronary reperfusion, 14 pigs were randomly assigned to receive an intramyocardial injection of placebo medium with or without bFGF-incorporating hydrogel implantation. As a second study, 26 pigs were randomized to receive controlled release of bFGF combined with or without hCDCs or bone marrow-derived mesenchymal stem cell transplantation 4 weeks after reperfusion. RESULTS: Controlled release of bFGF in ischemic myocardium significantly augmented the formation of microvascular networks to enhance myocardial perfusion and contractile function. When combined with cell transplantation, the additive effects of bFGF were confined to hCDC-injected animals, but were not observed in animals receiving human bone marrow-derived mesenchymal stem cell transplantation. This was shown by increased donor-cell engraftment and enhanced cardiomyocyte differentiation in the transplanted hearts, resulting in synergistically improved ventricular function and regional wall motion and reduced infarct size. CONCLUSIONS: Controlled delivery of bFGF modulates the post-ischemic microenvironment to enhance hCDC engraftment and differentiation. This novel strategy demonstrates significant functional improvements after myocardial infarction and may potentially represent a therapeutic approach to be studied in a clinical trial in human heart failure.

DOI： 10.1016/j.jacc.2008.06.052

Stemming heart failure with cardiac- or reprogrammed-stem cells. 国際誌

Kento Tateishi, Naofumi Takehara, Hiroaki Matsubara, Hidemasa Oh

Journal of cellular and molecular medicine 12 ( 6A ) 2217 - 32 2008年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Despite extensive efforts to control myocyte growth by genetic targeting of the cell cycle machinery and small molecules for cardiac repair, adult myocytes themselves appeared to divide a limited number of times in response to a variety of cardiac muscle stresses. Rare tissue-resident stem cells are thought to exist in many adult organs that are capable of self-renewal and differentiation and possess a range of actions that are potentially therapeutic. Recent studies suggest that a population of cardiac stem cells (CSCs) is maintained after cardiac development in the adult heart in mammals including human beings; however, homeostatic cardiomyocyte replacement might be stem cell-dependent, and functional myocardial regeneration after cardiac muscle damage is not yet considered as sufficient to fully maintain or reconstitute the cardiovascular system and function. Although it is clear that adult CSCs have limitations in their capabilities to proliferate extensively and differentiate in response to injury in vivo for replenishing mature car-diomyocytes and potentially function as resident stem cells. Transplantation of CSCs expanded ex vivo seems to require an integrated strategy of cell growth-enhancing factor(s) and tissue engineering technologies to support the donor cell survival and subsequent proliferation and differentiation in the host microenvironment. There has been substantial interest regarding the evidence that mammalian fibroblasts can be genetically reprogrammed to induced pluripotent stem (iPS) cells, which closely resemble embryonic stem (ES) cell properties capable of differentiating into functional cardiomyocytes, and these cells may provide an alternative cell source for generating patient-specific CSCs for therapeutic applications.

DOI： 10.1111/j.1582-4934.2008.00487.x

Downregulation of Dicer expression by serum withdrawal sensitizes human endothelial cells to apoptosis. 国際誌

Satoshi Asada, Tomosaburo Takahashi, Koji Isodono, Atsuo Adachi, Hiroko Imoto, Takehiro Ogata, Tomomi Ueyama, Hiroaki Matsubara, Hidemasa Oh

American journal of physiology. Heart and circulatory physiology 295 ( 6 ) H2512-21 2008年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Although the modulated expression of Dicer is documented upon neoplastic transformation, little is known of the regulation of Dicer expression by environmental stimuli and its roles in the regulation of cellular functions in primary cells. In this study, we found that Dicer expression was downregulated upon serum withdrawal in human umbilical vein endothelial cells (HUVECs). Serum withdrawal induced a time-dependent repression of Dicer expression, which was specifically rescued by vascular endothelial cell growth factor or sphingosine-1-phosphate. When Dicer expression was silenced by short-hairpin RNA against Dicer, the cells were more prone to apoptosis under serum withdrawal, whereas the rate of apoptosis was comparable with control cells in the serum-containing condition. Real-time PCR-based gene expression profiling identified several genes, the expression of which was modulated by Dicer silencing, including adhesion and matrix-related molecules, caspase-3, and nitric oxide synthase 3 (NOS3). Dicer silencing markedly impaired migratory functions without affecting cell adhesion and repressed phosphorylation of focal adhesion kinase and proline-rich tyrosine kinase 2 in adherent HUVECs. Dicer knockdown upregulated caspase-3 and downregulated NOS3 expression, and serum withdrawal indeed increased caspase-3 and decreased NOS3 expression. Furthermore, the overexpression of Dicer in HUVECs resulted in a marked reduction in apoptosis upon serum withdrawal and a decreased caspase-3 and increased NOS3 expression. The inhibition of NOS activity by Nomega-nitro-L-arginine methyl ester abrogated the effect of Dicer overexpression to rescue the cells from serum withdrawal-induced apoptosis. These results indicated that serum withdrawal decreases Dicer expression, leading to an increased susceptibility to apoptosis through the regulation of caspase-3 and NOS3 expression.

DOI： 10.1152/ajpheart.00233.2008

Crossveinless-2 controls bone morphogenetic protein signaling during early cardiomyocyte differentiation in P19 cells. 国際誌

Koichiro Harada, Akiko Ogai, Tomosaburo Takahashi, Masafumi Kitakaze, Hiroaki Matsubara, Hidemasa Oh

The Journal of biological chemistry 283 ( 39 ) 26705 - 13 2008年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

Increasing evidence indicates that bone morphogenetic proteins (BMPs) are crucial for cardiac induction, specification, and development. Although signaling of BMPs is tightly regulated through soluble BMP-binding proteins, how they regulate BMP signaling during cardiac differentiation remains unknown. To identify molecules responsible for BMP signaling during early cardiomyocyte differentiation of P19 cells, cDNA subtraction was performed. We found a bimodal expression of the BMP-binding protein Crossveinless-2 (Cv2) during cardiomyocyte differentiation; Cv2 is temporally expressed earlier than cardiac transcription factors such as Nkx2.5 and Tbx5 and acts as a suppressor for BMP signaling in P19 cells. We established a P19 clonal cell line harboring a cardiac alpha-myosin heavy chain promoter-driven enhanced green fluorescent protein gene to monitor cardiac differentiation by flow cytometry. Treatment with BMP2 during the first 2 days of differentiation suppressed cardiomyocyte differentiation through activation of down-stream targets Smad1/5/8 protein and Id1 gene, whereas treatment with Cv2 conversely inhibited Smad1/5/8 activation and Id1 expression, leading to increased generation of cardiac cells. RNA interference-mediated knockdown (KD) of endogenous Cv2 showed increased Smad1/5/8 activation and impaired cardiomyocyte differentiation. Expression of cardiac mesoderm markers was reduced, whereas expression of Id1 and endoderm markers such as Sox7, Hnf4, and E-cadherin was induced in Cv2-kinase dead cells. These phenotypes were rescued by the addition of Cv2 protein to the culture media during the first 2 days of differentiation or co-culture with parental cells. These data suggest that Cv2 may specify cardiac mesodermal lineage through inhibition of BMP signaling at early stage of cardiogenesis.

DOI： 10.1074/jbc.M801485200

MURC, a muscle-restricted coiled-coil protein, is involved in the regulation of skeletal myogenesis. 国際誌

Masashi Tagawa, Tomomi Ueyama, Takehiro Ogata, Naofumi Takehara, Norio Nakajima, Koji Isodono, Satoshi Asada, Tomosaburo Takahashi, Hiroaki Matsubara, Hidemasa Oh

American journal of physiology. Cell physiology 295 ( 2 ) C490-8 2008年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

Skeletal myogenesis is a multistep process by which multinucleated mature muscle fibers are formed from undifferentiated, mononucleated myoblasts. However, the molecular mechanisms of skeletal myogenesis have not been fully elucidated. Here, we identified muscle-restricted coiled-coil (MURC) protein as a positive regulator of myogenesis. In skeletal muscle, MURC was localized to the cytoplasm with accumulation in the Z-disc of the sarcomere. In C2C12 myoblasts, MURC expression occurred coincidentally with myogenin expression and preceded sarcomeric myosin expression during differentiation into myotubes. RNA interference (RNAi)-mediated knockdown of MURC impaired differentiation in C2C12 myoblasts, which was accompanied by impaired myogenin expression and ERK activation. Overexpression of MURC in C2C12 myoblasts resulted in the promotion of differentiation with enhanced myogenin expression and ERK activation during differentiation. During injury-induced muscle regeneration, MURC expression increased, and a higher abundance of MURC was observed in immature myofibers compared with mature myofibers. In addition, ERK was activated in regenerating tissue, and ERK activation was detected in MURC-expressing immature myofibers. These findings suggest that MURC is involved in the skeletal myogenesis that results from modulation of myogenin expression and ERK activation. MURC may play pivotal roles in the molecular mechanisms of skeletal myogenic differentiation.

DOI： 10.1152/ajpcell.00188.2008

MURC, a muscle-restricted coiled-coil protein that modulates the Rho/ROCK pathway, induces cardiac dysfunction and conduction disturbance. 国際誌

Takehiro Ogata, Tomomi Ueyama, Koji Isodono, Masashi Tagawa, Naofumi Takehara, Tsuneaki Kawashima, Koichiro Harada, Tomosaburo Takahashi, Tetsuo Shioi, Hiroaki Matsubara, Hidemasa Oh

Molecular and cellular biology 28 ( 10 ) 3424 - 36 2008年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

We identified a novel muscle-restricted putative coiled-coil protein, MURC, which is evolutionarily conserved from frog to human. MURC was localized to the cytoplasm with accumulation in the Z-line of the sarcomere in the murine adult heart. MURC mRNA expression in the heart increased during the developmental process from the embryonic stage to adulthood. In response to pressure overload, MURC mRNA expression increased in the hypertrophied heart. Using the yeast two-hybrid system, we identified the serum deprivation response (SDPR) protein, a phosphatidylserine-binding protein, as a MURC-binding protein. MURC induced activation of the RhoA/ROCK pathway, which modulated serum response factor-mediated atrial natriuretic peptide (ANP) expression and myofibrillar organization. SDPR augmented MURC-induced transactivation of the ANP promoter in cardiomyocytes, and RNA interference of SDPR attenuated the action of MURC on the ANP promoter. Transgenic mice expressing cardiac-specific MURC (Tg-MURC) exhibited cardiac contractile dysfunction and atrioventricular (AV) conduction disturbances with atrial chamber enlargement, reduced thickness of the ventricular wall, and interstitial fibrosis. Spontaneous episodes of atrial fibrillation and AV block were observed in Tg-MURC mice. These findings indicate that MURC modulates RhoA signaling and that MURC plays an important role in the development of cardiac dysfunction and conduction disturbance with increased vulnerability to atrial arrhythmias.

DOI： 10.1128/MCB.02186-07

Skeletal muscle-derived progenitors capable of differentiating into cardiomyocytes proliferate through myostatin-independent TGF-beta family signaling. 国際誌

Tetsuya Nomura, Tomomi Ueyama, Eishi Ashihara, Kento Tateishi, Satoshi Asada, Norio Nakajima, Koji Isodono, Tomosaburo Takahashi, Hiroaki Matsubara, Hidemasa Oh

Biochemical and biophysical research communications 365 ( 4 ) 863 - 9 2008年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

The existence of skeletal muscle-derived stem cells (MDSCs) has been suggested in mammals; however, the signaling pathways controlling MDSC proliferation remain largely unknown. Here we report the isolation of myosphere-derived progenitor cells (MDPCs) that can give rise to beating cardiomyocytes from adult skeletal muscle. We identified that follistatin, an antagonist of TGF-beta family members, was predominantly expressed in MDPCs, whereas myostatin was mainly expressed in myogenic cells and mature skeletal muscle. Although follistatin enhanced the replicative growth of MDPCs through Smad2/3 inactivation and cell cycle progression, disruption of myostatin did not increase the MDPC proliferation. By contrast, inhibition of activin A (ActA) or growth differentiation factor 11 (GDF11) signaling dramatically increased MDPC proliferation via down-regulation of p21 and increases in the levels of cdk2/4 and cyclin D1. Thus, follistatin may be an effective progenitor-enhancing agent neutralizing ActA and GDF11 signaling to regulate the growth of MDPCs in skeletal muscle.

Therapeutic potential of stem/progenitor cells in human skeletal muscle for cardiovascular regeneration. 国際誌

Tetsuya Nomura, Eishi Ashihara, Kento Tateishi, Tomomi Ueyama, Tomosaburo Takahas-Hi, Masaaki Yamagishi, Toshikazu Kubo, Hitoshi Yaku, Hiroaki Matsubara, Hidemasa Oh

Current stem cell research & therapy 2 ( 4 ) 293 - 300 2007年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Although myoblast transplantation in patients with ischemic heart failure results in a significant improvement of cardiac function, subsequent studies have consistently shown the myotubes formation in the absence of electromechanical coupling with the neighboring host myocardium, accompanied with the short-term release of paracrine effectors from implanted cells. One major pitfall of using myoblasts is that transplanted cells do not differentiate into cardiomyocytes, which may cause the inherent proarrhythmogenic events. Therefore, whether a discrete subpopulation in heterogeneous muscle-cell cultures is responsible for substantial cardiovascular regeneration has yet to be investigated. We describe here the isolation of progenitor cells from human skeletal muscle. These cells proliferated as non-adherent myospheres in suspension and displayed early embryonic factors and mesenchymal cell-like characteristics. Flow cytometric analyses demonstrated that CD56/N-CAM/Leu-19, a neural cell adhesion molecule abundantly present in myoblasts, was absent in myospheres but was expressed in an adherent cell population containing myogenic precursors. Myosphere-derived progenitor cells (MDPCs) differentiated in culture to produce cardiac, smooth muscle, and endothelial cells. Transplantation of MDPCs into ischemic hearts in NOD/scid mice promoted angiogenesis with substantial cardiovascular regeneration. Our results provide a foundation to further study the cell and biological function of human MDPCs which may have potential therapeutic implications.

Osteopontin is a myosphere-derived secretory molecule that promotes angiogenic progenitor cell proliferation through the phosphoinositide 3-kinase/Akt pathway. 国際誌

Takehiro Ogata, Tomomi Ueyama, Tetsuya Nomura, Satoshi Asada, Masashi Tagawa, Tomoyuki Nakamura, Tomosaburo Takahashi, Hiroaki Matsubara, Hidemasa Oh

Biochemical and biophysical research communications 359 ( 2 ) 341 - 7 2007年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

We have reported that skeletal myosphere-derived progenitor cells (MDPCs) can differentiate into vascular cells, and that MDPC transplantation into cardiomyopathic hearts improves cardiac function. However, the autocrine/paracrine molecules and underlying mechanisms responsible for MDPC growth have not yet been determined. To explore the molecules enhancing the proliferation of MDPCs, we performed serial analysis of gene expression and signal sequence trap methods using RNA isolated from MDPCs. We identified osteopontin (OPN), a secretory molecule, as one of most abundant molecules expressed in MDPCs. OPN provided a proliferative effect for MDPCs. MDPCs treated with OPN showed Akt activation, and inhibition of the phosphoinositide 3-kinase (PI3K)/Akt pathway repressed the proliferative effect of OPN. Furthermore, OPN-pretreated MDPCs maintained their differentiation potential into endothelial and vascular smooth muscle cells. These findings indicate an important role of OPN as an autocrine/paracrine molecule in regulating the proliferative growth of muscle-derived angiogenic progenitor cells via the PI3K/Akt pathway.

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