Publishing type：Research paper (scientific journal)  

DOI： 10.1155/crid/7698933

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DOI： 10.1155/crid/2879891

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Language：Japanese   Publisher：岡山歯学会  

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

BACKGROUND: Deep neck infections (DNIs) are potentially life-threatening diseases that are mainly caused by odontogenic and peritonsillar infections. Although DNI has also been reported to be caused by foreign bodies, no review articles exist to date. METHODS: A comprehensive literature search was conducted using PubMed for articles published between 2005 and 2025. RESULTS: A total of 131 relevant articles were identified. Frequently reported foreign bodies included injectable materials used in facial filler and fish bone. The latency to symptom onset varied widely, ranging from within 1 h after foreign body insertion to as long as 25 years, with substantial differences observed depending on the type of foreign body. CONCLUSION: Although foreign bodies are rare causes of DNIs, various type of foreign bodies have been reported. Recognizing the possibilities of DNIs caused by foreign bodies will help oral and maxillofacial surgeons to search for the cause rapidly and determine treatment plans and prevent recurrence.

DOI： 10.1016/j.jormas.2025.102669

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.ajoms.2025.06.004

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

Cisplatin (CDDP) resistance remains a major clinical challenge in the treatment of head and neck squamous cell carcinoma (HNSC). Our group identified ATPase copper transporting beta (ATP7B) as a mediator of CDDP resistance through its role in drug efflux and small extracellular vesicle (sEV) secretion. Herein, we uncovered a novel mechanism by which ATP7B regulates sEV dynamics and the intercellular transmission of CDDP resistance. Using transcriptomic analyses of HNSC datasets, we demonstrate that ATP7B expression correlates with endocytosis- and epithelial-mesenchymal transition (EMT)-related gene sets and with elevated levels of EV-associated proteins. CDDP-resistant HNSC cells exhibited upregulated ATP7B, Rab5/Rab7, and preferentially secreted HSP90- and EpCAM-rich sEVs. These sEVs were leading to increased ATP7B expression and reduced CDDP sensitivity in recipient cells. A pharmacological inhibition of sEV biogenesis with GW4869 suppressed ATP7B and Atox1 expressions, inhibited late endosome maturation, and significantly enhanced CDDP-induced apoptosis in HNSC cells. In vivo, GW4869 reduced the sEV protein content and ATP7B expression in xenograft tumors. These findings establish that ATP7B is a critical modulator of sEV cargo and resistance propagation. Our results highlight a previously unrecognized ATP7B-sEV axis driving chemoresistance and identify sEV inhibition as a promising strategy to overcome therapeutic failure in HNSC.

DOI： 10.1038/s41417-025-00975-9

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

We report the extremely rare case of an atypical schwannoma that occurred at the median inferior surface of the tongue in an elderly patient. We performed an excisional biopsy to achieve a definitive diagnosis. Based on the histopathological findings, we diagnosed a schwannoma (mixed type, Antoni A/B).

DOI： 10.1002/ccr3.70506

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

This review explores the novel perspective that the intermediate tendon of the digastric muscle may function as an anatomical trochlear pulley system within the human body, challenging the traditional understanding of trochlear systems. While widely recognized trochlear units include structures like the medial part of the humerus and the superior oblique muscle of the orbit, the review focuses on the unique anatomical arrangement of the intermediate tendon of the digastric muscle in connection with the anterior and posterior bellies of the digastric muscles. Despite current debates within the anatomical community about labeling the digastric muscles as having a trochlea, this paper delves into the scientific definition of a trochlear pulley system, presenting the intermediate tendon of the digastric muscle as a potential trochlea.

DOI： 10.5115/acb.24.178

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

The maxillary vein, despite its clinical significance, remains underexplored in anatomical literature. It plays a crucial role in venous drainage of the maxillofacial region and is closely associated with surgical procedures such as sagittal split ramus osteotomy, mandibuloplasty, and condylar or parotid surgeries. Due to its variable anatomy and proximity to critical structures, the maxillary vein poses a risk of significant hemorrhage if injured. Its small size and deep location make preoperative identification challenging, especially without contrast-enhanced imaging. Embryologically, the maxillary vein originates from the primitive maxillary vein and develops through complex anastomoses with other craniofacial veins. Anatomical studies have revealed several variations, including the presence of accessory mandibular foramina and unusual venous connections, which may increase surgical risk. Understanding the detailed anatomy and potential variations of the maxillary vein is essential for minimizing complications and improving surgical outcomes. Despite its importance, more anatomical and clinical research is needed to better define its course, variations, and implications in oral and maxillofacial surgery.

DOI： 10.5115/acb.25.024

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

We report a rare case in which a metallic foreign body remained undetected in a patient's maxilla for nearly 40 years after a childhood bicycle accident. Despite the accident, the implant remained in place without causing infection due to the lack of imaging studies at the time. The metal was accidentally discovered during a routine dental imaging examination 40 years later and subsequently surgically removed. This case highlights the importance of comprehensive imaging and the dangers of overlooking foreign bodies, especially in the vulnerable head and neck region. The patient, 53 years old at the time of discovery, presented to the dentist due to discomfort in the palate and nasal cavity. During this visit, radiographs were taken and a foreign body was discovered. Surgical removal of the foreign body revealed significant corrosion and surrounding granulation tissue indicative of foreign body granuloma. Elemental analysis of the foreign body confirmed that it was an iron-based metal, unlike biocompatible materials such as titanium. These findings reinforce the need for close post-trauma evaluation and follow-up, especially in cases of pediatric trauma, to avoid the possibility of long-term complications arising from unnoticed foreign bodies in anatomically significant areas.

DOI： 10.1002/ccr3.9631

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

BACKGROUND: It is generally accepted that the greater palatine nerve and artery supply the palatal mucosa, gingiva, and glands, but not the bone or tooth adjacent to those tissues. When the bony palate is observed closely, multiple small foramina are seen on the palatal surface of the alveolar process. The authors hypothesized that the greater palatine nerve and artery might supply the maxillary teeth via the foramina on the palatal surface of the alveolar process and the superior alveolar nerve and artery. The authors aimed to investigate the palatal innervation and blood supply of the maxillary teeth. METHODS: Eight cadaveric maxillae containing most teeth or alveolar sockets were selected. The mean age at the time of death was 82.4 years. The samples were examined with colored water injection, latex injection, microcomputed tomography with contrast dye, gross anatomic dissection, and histologic observation. RESULTS: Through both injection studies and microcomputed tomographic analysis, the authors found that the small foramina on and around the greater palatine groove connected to the alveolar process and tooth sockets. The small foramina in the greater palatine and incisive canal also continued inside the alveolar process and the tooth sockets. CONCLUSIONS: The alveolar branches of the greater palatine nerve and artery as well as the nasopalatine nerve and sphenopalatine artery supply maxillary teeth, alveolar bone, and periodontal tissue via the palatal alveolar foramina with superior alveolar nerves and arteries. PRACTICAL IMPLICATIONS: This knowledge is essential for dentists when administering local anesthetic to the maxillary teeth and performing an osteotomy. Anatomic and dental textbooks should be updated with this new knowledge for better patient care.

DOI： 10.1016/j.adaj.2024.11.012

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

The lingual nerve (LN) is a branch of the mandibular division of the fifth cranial nerve, the trigeminal nerve, arising in the infratemporal fossa. It provides sensory fibers to the mucous membranes of the floor of the mouth, the lingual gingiva, and the anterior two-thirds of the tongue. Although the LN should rarely be encountered during routine and basic oral surgical procedures in daily dental practice, its anatomical location occasionally poses the risk of iatrogenic injury. The purpose of this section is to consider this potential LN injury risk and to educate readers about the anatomy of this nerve and how to treat it.

DOI： 10.1002/ca.24211

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

The lingual nerve (LN) is a branch of the mandibular division of the fifth cranial nerve, the trigeminal. It primarily carries sensory fibers from the lingual gingiva, mucous membranes of the floor of the mouth, sublingual gland, and the anterior two-thirds of the tongue. Recent studies have explored and reclassified the five branches of the LN as branches to the isthmus of the fauces, lingual branches, sublingual nerves, posterior branch to the submandibular ganglion, and branches to the sublingual ganglion. The knowledge of the LN anatomy and its variants is clinically relevant to avoid its injury during oral procedures. The objective of this paper is to review the literature on the LN and to describe the anatomy, its course, and its functions.

DOI： 10.1002/ca.24210

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Odontomas, often found adjacent to impacted teeth, are tumors of abnormal tissue morphology arising from the tooth germ and are usually asymptomatic. They are often found by accident on X-ray images, and the eruption of permanent teeth is often caused by odontomas. In most cases, the tooth is extracted with the permanent tooth or orthodontic treatment is performed after extraction. However, the criteria are not clear. We encountered two cases of dental eruption in which permanent teeth, which originally seemed to be suitable for orthodontic treatment, spontaneously erupted after odontoma removal. It is necessary to examine the indications and timing of tooth extraction.

DOI： 10.7759/cureus.61460

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Publishing type：Research paper (scientific journal)   Publisher：American Association for Cancer Research (AACR)  

Abstract

Regulatory T cells (Tregs) contribute to the immunosuppressive nature of pancreatic ductal adenocarcinoma (PDAC). Systemic depletion of Tregs can enhance anti-tumor T cell immunity, but can also cause unwanted autoimmune complications. A tumor-specific Treg-targeted therapy that effectively and safely enhances anti-tumor immunity for PDAC treatment remains an unmet need. We have recently found that αvβ5 integrin is expressed on Tregs that reside in the PDAC, but not those in the spleen, suggesting that the integrin can serve as a targetable marker for tumor-resident Tregs. Indeed, long-term treatment with the iRGD tumor-penetrating peptide, which effectively targets αvβ5+ cells in PDAC tissue, depleted Tregs in a tumor-specific manner leading to a significant expansion of CD8+ T cells in transgenic and syngeneic PDAC mouse models. αvβ5+ Tregs were induced from both naïve CD4+ T cells and naturally occurring Tregs. T cell receptor stimulation was found to be the common inducer of αvβ5+ Tregs. αvβ5+ Tregs formed a subpopulation of CCR8+ Tregs, which are preferentially found in the tumor tissue of various cancer types. Our most recent data show that the αvβ5 integrin marks a highly immunosuppressive fraction of the CCR8+ Tregs, suggesting that targeting αvβ5+ Tregs can lead to effective depletion of immunosuppressive Tregs in a tumor-specific manner.

Citation Format: Yuki Kunisada, Kodai Suzuki, Norio Miyamura, Shingo Eikawa, Tatiana Hurtado de Mendoza, Evangeline S. Mose, Caisheng Lu, Yukihito Kuroda, Erkki Ruoslahti, Andrew M. Lowy, Kazuki N. Sugahara. αvβ5 Integrin serves as a tumor-specific marker for immunosuppressive regulatory T cells in pancreatic cancer [abstract]. In: Proceedings of the AACR Special Conference in Cancer Research: Pancreatic Cancer; 2023 Sep 27-30; Boston, Massachusetts. Philadelphia (PA): AACR; Cancer Res 2024;84(2 Suppl):Abstract nr B026.

DOI： 10.1158/1538-7445.panca2023-b026

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Publishing type：Research paper (scientific journal)   Publisher：American Association for Cancer Research (AACR)  

Abstract

The iRGD tumor-penetrating peptide delivers chemically linked drugs and even co-injected free drugs selectively to extravascular tumor tissue by targeting the αvβ5 integrin and neuropilin-1 (NRP1). A phase 1b clinical trial showed that iRGD appears to safely double the response rate of standard chemotherapy in patients with stage 4 pancreatic ductal adenocarcinoma (PDAC). We recently found that long-term iRGD treatment, even as a monotherapy, reduced regulatory T cells (Tregs) selectively in the PDAC tissue, which led to the expansion of CD8+ T cells and improved efficacy of immunotherapy in syngeneic PDAC mice. This finding led to the discovery of αvβ5 integrin being a novel targetable marker for tumor-resident Tregs in PDAC mice. Our recent data show that αvβ5 integrin+ Tregs are also present in human PDAC tissue. To study the significance of αvβ5 integrin+ human Tregs as a therapeutic target for iRGD, we developed a humanized PDAC (huPDAC) mouse model by transplanting human PDAC cells into human immune system (HIS) mice, which harbor fully matured human CD8+ and CD4+ T cells, natural killer T cells, B cells, and dendritic cells. The CD8+ T cells are human leukocyte antigen (HLA)-restricted and show a tumor antigen-specific response. We orthotopically implanted HLA-matched human PDAC cells into HLA-A2-positive HIS mice. Both an established human PDAC cell line (PANC-1) and patient-derived PDAC cells (0779E) successfully formed orthotopic tumors and liver metastases. The tumors were infiltrated by various human immune cells at a ratio similar to that found in patient-derived PDAC tissues. Of note, αvβ5 integrin+ human Tregs were also noted in the tumors but not in the spleen. iRGD monotherapy increased the ratio of CD8+ T cells per Tregs in the tumors, suggesting that iRGD will likely function as an immunomodulator in humans. The first patient was recently dosed in a new phase 1b/2a clinical trial (iLSTA Trial: ACTRN12623000223639), which assesses the safety and preliminary efficacy of iRGD in combination with standard-of-care chemotherapy and immunotherapy in locally advanced PDAC patients.

Citation Format: Norio Miyamura, Kodai Suzuki, Richard A. Friedman, Aristidis Floratos, Yuki Kunisada, Kazuya Masuda, Andrew M. Lowy, Moriya Tsuji, Kazuki N. Sugahara. A novel pancreatic cancer mouse model with human immunity [abstract]. In: Proceedings of the AACR Special Conference in Cancer Research: Pancreatic Cancer; 2023 Sep 27-30; Boston, Massachusetts. Philadelphia (PA): AACR; Cancer Res 2024;84(2 Suppl):Abstract nr B059.

DOI： 10.1158/1538-7445.panca2023-b059

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

BACKGROUND/AIM: Malignant melanoma is a tumor with a poor prognosis that can metastasize distally at an early stage. Terrein, a metabolite produced by Aspergillus terreus, suppresses the expression of angiogenin, an angiogenic factor. However, the pharmacological effects of natural terrein have not been elucidated, because only a small amount of terrein can be extracted from large fungal cultures. In this study, we investigated the antineoplastic effects of terrein on human malignant melanoma cells and its underlying mechanisms. MATERIALS AND METHODS: Human malignant melanoma cell lines were cultured in the presence of terrein and analyzed. Angiogenin production was evaluated using ELISA. Ribosome biosynthesis was evaluated using silver staining of the nucleolar organizer region. Intracellular signaling pathways were analyzed using western blotting. Malignant melanoma cells were transplanted subcutaneously into the backs of nude mice. The tumors were removed at 5 weeks and analyzed histopathologically. RESULTS: Terrein inhibited angiogenin expression, proliferation, migration, invasion, and ribosome biosynthesis in malignant melanoma cells. Terrein was shown to inhibit tumor growth and angiogenesis in animal models. CONCLUSION: This study demonstrated that terrein has anti-tumor effects against malignant melanoma. Furthermore, chemically synthesized non-natural terrein can be mass-produced and serve as a novel potential anti-tumor drug candidate.

DOI： 10.21873/cgp.20464

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

Amyloidosis is a disease in which amyloid protein is deposited in organs and tissues, resulting in functional impairment. Amyloidosis occurs in 12%-30% of patients with multiple myeloma, but in rare cases, amyloidosis may precede the diagnosis of multiple myeloma. Our patient was a 76-year-old Japanese male on dialysis. Multiple nodules accompanied by ulcers were observed on his tongue. He had no subjective symptoms or clinical findings associated with multiple myeloma. The histopathological findings suggested amyloidosis. We suspected both systemic and localized amyloidosis and performed a comprehensive systemic examination. Since the patient had been on dialysis for only a short period of time (~3 months), dialysis-related amyloidosis was ruled out. After blood and urine tests, a diagnosis of multiple myeloma was made. Chemotherapy treatment was started, but the patient's multiple myeloma could not be suppressed and the tongue amyloidosis worsened, leading to his death 2 years and 2 months after the initial diagnosis.

DOI： 10.1155/2024/8836103

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

Pancreatic ductal adenocarcinoma (PDAC) is characterized by a tumor immune microenvironment (TIME) that promotes resistance to immunotherapy. A preclinical model system that facilitates studies of the TIME and its impact on the responsiveness of human PDAC to immunotherapies remains an unmet need. We report a novel mouse model, which develops metastatic human PDAC that becomes infiltrated by human immune cells recapitulating the TIME of human PDAC. The model may serve as a versatile platform to study the nature of human PDAC TIME and its response to various treatments.

DOI： 10.1101/2023.05.24.542127

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

Pancreatic ductal adenocarcinoma (PDAC) has abundant immunosuppressive regulatory T cells (Tregs), which contribute to a microenvironment resistant to immunotherapy. Here, we report that Tregs in the PDAC tissue, but not those in the spleen, express the αvβ5 integrin in addition to neuropilin-1 (NRP-1), which makes them susceptible to the iRGD tumor-penetrating peptide, which targets cells positive for αv integrin- and NRP-1. As a result, long-term treatment of PDAC mice with iRGD leads to tumor-specific depletion of Tregs and improved efficacy of immune checkpoint blockade. αvβ5 integrin + Tregs are induced from both naïve CD4 + T cells and natural Tregs upon T cell receptor stimulation, and represent a highly immunosuppressive subpopulation of CCR8 + Tregs. This study identifies the αvβ5 integrin as a marker for activated tumor-resident Tregs, which can be targeted to achieve tumor-specific Treg depletion and thereby augment anti-tumor immunity for PDAC therapy.

DOI： 10.1101/2023.05.24.542137

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Fibrous dysplasia (FD) is a fibrous lesion of immature bone, with an incidence of 10-20% in the head and neck region. Most cases are monostotic, but when a lesion occurs on the maxillofacial region and spreads to the surrounding bone, it is classified as polyostotic, despite its localized occurrence. In some cases, surgical intervention is required to improve the cosmetic or functional disturbance of a FD in the maxillofacial region, but it is necessary to confirm symmetry of the maxillofacial region in real time, and a surgical support system is required to compensate. Furthermore, prosthetic intervention is considered when postoperative acquired defects occur or further cosmetic or occlusal function improvement is needed. A comprehensive approach by an oral surgeon and a maxillofacial prosthodontist is necessary for the successful treatment and rehabilitation of such patients. In this article, we describe the case of a craniomaxillofacial FD patient with facial asymmetry and denture incompatibility with improved quality of life measures by integrating surgical treatment using a navigation system and postoperative prosthetic rehabilitation. We also discuss recent diagnostic methods and treatment strategies for craniomaxillofacial FD in the literature.

DOI： 10.3390/diagnostics12092146

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Language：Japanese   Publisher：(公社)日本口腔外科学会  

口腔癌化学療法中に肺血栓塞栓症(PTE)を発症したが、的確な対処により治療を継続、完遂することができた1例を経験した。症例は59歳男性で、主訴は左側上顎歯肉の腫脹であった。左側上顎臼歯抜歯窩の治癒経過が不良で、当科を紹介受診した。左側上顎小臼歯部歯肉に25×20mm大の硬結を伴う表面不正な潰瘍性病変を認め、左側上顎歯肉癌と臨床診断した。生検の結果は強い浸潤傾向を示す中等度分化型扁平上皮癌であった。術前化学療法TPF療法を開始したが、3日目に強い胸部痛と呼吸困難を訴えた。造影CT検査で左肺動脈下葉枝に造影不良域を認め、肺動脈血栓によるPTEと診断した。ヘパリンナトリウム注射液の静脈内投与とワルファリンカリウムの経口投与を行い、胸部症状が消失した。化学療法1コースは予定通り完遂でき、PTE発症の21日後に手術を施行した。術後11年2ヵ月で再発や遠隔転移はない。

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Other Link： https://search.jamas.or.jp/default/link?pub_year=2022&ichushi_jid=J01073&link_issn=&doc_id=20220506440003&doc_link_id=10.5794%2Fjjoms.68.193&url=https%3A%2F%2Fdoi.org%2F10.5794%2Fjjoms.68.193&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

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

Background/Aim: Cancer research has been conducted using cultured cells as part of drug discovery testing, but conventional two-dimensional culture methods are unable to reflect the complex tumor microenvironment. On the other hand, three-dimensional cultures have recently been attracting attention as in vitro models that more closely resemble the in vivo physiological environment. The purpose of this study was to establish a 3D culture method for oral cancer and to verify its practicality. Materials and Methods: Three-dimensional cultures were performed using several oral cancer cell lines. Western blotting was used for protein expression analysis of the collected cell masses (spheroids), and H-E staining was used for structural observation. The cultures were exposed to cisplatin and cetuximab and the morphological changes of spheroids over time and the expression changes of target proteins were compared. Results: Each cell line formed spheroidal cell aggregates and showed enhancement of cell adhesion molecules over time. H-E staining showed tumor tissue-like structures specific to each cell line. Cisplatin showed concentration-dependent antitumor effects due to loss of cell adhesion and spheroid disruption in each cell line, while cetuximab exhibited antitumor effects that correlated with EGFR expression in each cell line. Conclusion: Spheroids made from oral cancer cell lines appeared to have tumor-like characteristics that may reflect their clinical significance. In the future, it may become possible to produce tumor spheroids from tissue samples of oral cancer patients, and then apply them to drug screening and to develop individualized diagnostic and treatment methods.

DOI： 10.7150/ijms.74109

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Language：Japanese   Publisher：(一社)日本口腔内科学会  

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PURPOSE: The displacement of the tooth/tooth fragment into the floor of mouth sometimes happens during the lower third molar surgery and the patients are usually referred to oral and maxillofacial surgeons. To date, however, there is no consensus how to manage the displaced tooth due to the lack of available data. METHODS: In this study, we have retrospectively analyzed the management of the displaced lower third molar into the floor of mouth. Our institute experienced seven cases during 2010 to 2020. RESULTS: Incidence rate of the lingual nerve injury caused by displacement of the lower third molar was 1/7. Six patients out of seven underwent surgical removal of the displaced fragment. The direct approach was used when the fragment was palpable superficially and the fragment was horizontally located away from the lingual plate (2 cases), while when the fragment was not palpable, or was palpable and adjacent to the lingual plate, the lingual mucoperiosteal flap was selected (4 cases). CONCLUSION: We conclude that the palpation and preoperative diagnosis with computed tomographic images are significantly important to decide a better and most effective surgical approach.

DOI： 10.1007/s10006-021-01012-3

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Gingival squamous cell carcinoma (SCC) frequently invades the maxillary or mandibular bone, and bone destruction is known as a key prognostic factor in gingival SCCs. Recently, Neurokinin 3 receptor (NK-3R), the receptor ligand for NK-3, which is a member of the tachykinin family expressed in the central nervous system, was identified through pathway analysis as a molecule expressed in osteoclasts induced by the hedgehog signal. Although the expression of NK-3R has been detected in osteoclast and SCC cells at the bone invasion front, the relationship between NK-3R expression and the prognosis of gingival SCC patients remains unclear. In the present study, we retrospectively reviewed 27 patients with gingival SCC who had undergone surgery with curative intent. Significantly higher NK-3R expression in tumor cells was found in a case of jawbone invasion than in a case of exophytic poor jawbone invasion. On the other hand, no significant association was observed between NK-3R tumor-positive cases and tumor size, TNM stage, or tumor differentiation. The survival rate tended to be lower in NK-3R tumor-positive cases, but not significantly. However, the disease-specific survival rate was significantly lower in patients with a large number of NK-3R-positive osteoclasts than in those with a small number of them at the tumor bone invasion front. Our results suggest that NK-3R signaling in the gingival SCC bone microenvironment plays an important role in tumor bone destruction and should be considered a potential therapeutic target in advanced gingival SCC with bone destruction.

DOI： 10.3390/diagnostics11061044

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

In younger patients of LCH, we should consider that the effectiveness of follow-up without aggressive treatment for SS-type LCH in the oral and maxillofacial bone. However, there are very rare case in which an SS-type LCH recurred after showing a healing tendency. Regular follow-up must be performed even after healing.

DOI： 10.1002/ccr3.4321

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ccr3.4321

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INTRODUCTION: Neurofibromatosis is a disease that causes various abnormalities such as neurofibroma, mainly in the skin and nerves. The common sites in the oral cavity are the palate, gingiva, tongue, buccal mucosa, and lips but, occurrence in the mandible is rare. PRESENTATION OF CASE: A 26-year-old woman was referred to our clinic because of percussion pain. Radiographic findings showed a radiolucent area. The patient was clinically diagnosed with a radicular cyst by a previous doctor. Multiple café-au-lait spots were found disseminated on her body, and she had already been prenatally diagnosed with neurofibromatosis type 1 (NF1). We performed a biopsy and suggested a neurofibroma. Tumor extirpation was performed under general anesthesia. The histopathological diagnosis showed a neurofibroma. CLINICAL DISCUSSION AND CONCLUSION: NF1 is a systemic nevus that causes abnormalities in melanocytes and Schwann cells, and various lesions appear, but intramandibular lesions are extremely rare. Diagnosis of NF1 and radicular cysts in the mandible is difficult due to their image resemblance. However, it should be kept in mind if the underlying disease is NF1. In our case, it was easy to detach and may have originated from small peripheral nerve endings in the mandible.

DOI： 10.1016/j.ijscr.2021.105883

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Language：Japanese   Publisher：(公社)日本口腔外科学会  

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Language：Japanese   Publisher：(公社)日本口腔外科学会  

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Other Link： https://search.jamas.or.jp/default/link?pub_year=2021&ichushi_jid=J01073&link_issn=&doc_id=20210428520004&doc_link_id=10.5794%2Fjjoms.67.239&url=https%3A%2F%2Fdoi.org%2F10.5794%2Fjjoms.67.239&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

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Lower third molar removal is the most commonly performed dental surgical procedure. Nevertheless, it is difficult to ensure that all the informed consent forms given to patients are based on the best evidence as many newer publications could change the conclusions of previous research. Therefore, the goal of this review article is to cover existing meta-analyses, randomized control trials, and related articles in order to collect data for improved and more current informed consent.

DOI： 10.1002/ca.23693

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Bone pain is a common complication of breast cancer (BC) bone metastasis and is a major cause of increased morbidity and mortality. Although the mechanism of BC-associated bone pain (BCABP) remains poorly understood, involvement of BC products in the pathophysiology of BCABP has been proposed. Aggressive cancers secrete damage-associated molecular patterns (DAMPs) that bind to specific DAMP receptors and modulate cancer microenvironment. A prototypic DAMP, high mobility group box 1 (HMGB1), which acts as a ligand for the receptor for advanced glycation end products (RAGE) and toll-like receptors (TLRs), is increased in its expression in BC patients with poor outcomes. Here we show that 4T1 mouse BC cells colonizing bone up-regulate the expression of molecular pain markers, phosphorylated ERK1/2 (pERK) and pCREB, in the dorsal root ganglia (DRGs) innervating bone and induced BCABP as evaluated by hind-paw mechanical hypersensitivity. Importantly, silencing HMGB1 in 4T1 BC cells by shRNA reduced pERK and pCREB and BCABP with decreased HMGB1 levels in bone. Further, administration of a neutralizing antibody to HMGB1 or an antagonist for RAGE, FPS-ZM1, ameliorated pERK, pCREB and BCABP, while a TLR4 antagonist, TAK242, showed no effects. Consistent with these in vivo results, co-cultures of F11 sensory neuron-like cells with 4T1 BC cells in microfluidic culture platforms increased neurite outgrowth of F11 cells, which was blocked by HMGB1 antibody. Our results show that HMGB1 secreted by BC cells induces BCABP via binding to RAGE of sensory neurons and suggest that the HMGB1/RAGE axis may be a potential novel therapeutic target for BCABP.

DOI： 10.1016/j.jbo.2020.100330

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Language：Japanese   Publisher：(一社)日本口腔診断学会  

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Consideration of unexpected metastasis in patients who have undergone neck dissection with advanced tumors must be anticipated with careful follow-up.

DOI： 10.1002/ccr3.3086

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Bone destruction of maxillary and mandibular bone by invasive oral squamous cell cancer (OSCC) raises various problems in the management of patients, resulting in poor outcomes and survival. However, the mechanism behind bone destruction by OSCC remains unclear. High-mobility group box 1 (HMGB1), a highly conserved ubiquitous nuclear non-histone DNA-binding protein, has been demonstrated to be secreted by aggressive cancers and regulate osteoclastogenesis, a central player during bone destruction. We therefore reasoned that HMGB1 secreted by OSCCs contributes to bone destruction. Our results showed that HMGB1 is produced by human cell lines of OSCC and promotes osteoclastogenesis via up-regulation of the expression of receptor activator of nuclear factor kappa-Β ligand in osteoblasts and osteocytes, and consequently osteoclastic bone destruction in mice. Further, we found that these actions of HMGB1 are mediated via the receptor for advanced glycation end products and toll-like receptors. These findings suggest that HMGB1 of OSCC and its down-stream signal pathways are potential targets for the treatment of bone destruction associated with advanced OSCC.

DOI： 10.1016/j.bbrc.2020.07.120

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Spandidos Publications  

Advanced head and neck cancer (HNC) can invade facial bone and cause bone pain, thus posing a significant challenge to the quality of life of patients presenting with advanced HNC. The present study was designed to investigate HNC bone pain (HNC‑BP) in an intratibial mouse xenograft model that utilized an HNC cell line (SAS cells). These mice develop HNC‑BP that is associated with an expression of phosphorylated ERK1/2 (pERK1/2), which is a molecular indicator of neuron excitation in dorsal root ganglia (DRG) sensory neurons. Our experiments demonstrated that the inhibition of high mobility group box 1 (HMGB1) by short hairpin (shRNA) transduction, HMGB1 neutralizing antibody, and HMGB1 receptor antagonist suppressed the HNC‑BP and the pERK1/2 expression in DRG. It was also observed that HNC‑derived HMGB1 increased the expression of the acid‑sensing nociceptor, transient receptor potential vanilloid 1 (TRPV1), which is a major cause of osteoclastic HNC‑BP in DRG. Collectively, our results demonstrated that HMGB1 originating in HNC evokes HNC‑BP via direct HMGB1 signaling and hypersensitization for the acid environment in sensory neurons.

DOI： 10.3892/or.2020.7788

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Language：Japanese   Publisher：(NPO)日本顎変形症学会  

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The process of fracture healing consists of an inflammatory reaction and cartilage and bone tissue reconstruction. The inflammatory cytokine interleukin-1β (IL-1β) signal is an important major factor in fracture healing, whereas its relevance to retinoid receptor (an RAR inverse agonist, which promotes endochondral bone formation) remains unclear. Herein, we investigated the expressions of IL-1β and retinoic acid receptor gamma (RARγ) in a rat fracture model and the effects of IL-1β in the presence of one of several RAR inverse agonists on chondrocytes. An immunohistochemical analysis revealed that IL-1β and RARγ were expressed in chondrocytes at the fracture site in the rat ribs on day 7 post-fracture. In chondrogenic ATDC5 cells, IL-1β decreases the levels of aggrecan and type II collagen but significantly increased the metalloproteinase-13 (Mmp13) mRNA by real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis. An RAR inverse agonist (AGN194310) inhibited IL-1β-stimulated Mmp13 and Ccn2 mRNA in a dose-dependent manner. Phosphorylated extracellular signal regulated-kinases (pERK1/2) and p-p38 mitogen-activated protein kinase (MAPK) were increased time-dependently by IL-1β treatment, and the IL-1β-induced p-p38 MAPK was inhibited by AGN194310. Experimental p38 inhibition led to a drop in the IL-1β-stimulated expressions of Mmp13 and Ccn2 mRNA. MMP13, CCN2, and p-p38 MAPK were expressed in hypertrophic chondrocytes near the invaded vascular endothelial cells. As a whole, these results point to role of the IL-1β via p38 MAPK as important signaling in the regulation of the endochondral bone formation in fracture healing, and to the actions of RAR inverse agonists as potentially relevant modulators of this process.

DOI： 10.3390/ijms21072365

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

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) is an adverse drug reaction represented by destruction and/or death of bone. Fibrous dysplasia (FD) is a rare bony disorder characterised by abnormal fibro-osseous tissue that has lowered resistance to infection. Effective treatments for BRONJ that follows FD are unclear. Here, we report that advanced BRONJ associated with FD was successfully treated by surgical resection. A 69-year-old woman, whose left maxillary bone showed a ground glass appearance on computed tomography (CT) images, was taking alendronate. At 1 year after teeth within the abnormal bone were extracted, exposed bone was observed in the extraction sites and CT images revealed separated sequestrums. Under the clinical diagnosis of Stage 2 BRONJ with FD, we performed not only sequestrectomy but also a partial resection of the FD. Thereafter, the healing was uneventful without recurrence. In conclusion, our case suggests that surgical resection is useful for advanced BRONJ associated with FD.

DOI： 10.1093/jscr/rjaa061

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

Platinum‑based antitumor agents have been widely used to treat head and neck squamous cell carcinoma (HNSCC) and numerous other malignancies. Cisplatin is the most frequently used platinum‑based antitumor agent, however drug resistance and numerous undesirable side effects limit its clinical efficacy for cancer patients. Cancer cells discharge cisplatin into the extracellular space via copper transporters such as ATPase copper transporting beta (ATP7B) in order to escape from cisplatin‑induced cell death. In the present study, it was demonstrated for the first time that the copper chelator ammonium tetrathiomolybdate (TM) has several promising effects on cisplatin and HNSCC. First, TM suppressed the ATP7B expression in HNSCC cell lines in vitro, thereby enhancing the accumulation and apoptotic effect of cisplatin in the cancer cells. Next, it was revealed that TM enhanced the antitumor effect of cisplatin in HNSCC cell tumor progression in a mouse model of bone invasion, which is important since HNSCC cells frequently invade to facial bone. Finally, it was demonstrated that TM was able to overcome the cisplatin resistance of a human cancer cell line, A431, via ATP7B depression in vitro.

DOI： 10.3892/or.2019.7367

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Language：Japanese   Publisher：岡山歯学会  

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CD11b+ myeloid subpopulations, including myeloid-derived suppressor cells (MDSCs) and tumor-associated macrophages (TAMs), play crucial roles in the suppression of T-cell-mediated anti-tumor immunity. Regulation of these cell types is a primary goal for achieving efficient cancer immunotherapy. We found that metformin (Met) induces CD11b+-cell-mediated growth inhibition of a K7M2neo osteosarcoma independent of T cells, as growth inhibition of K7M2neo was still observed in wild-type (WT) mice depleted of T cells by antibodies and in SCID; this contrasted with the effect of Met on Meth A fibrosarcoma, which was entirely T-cell-dependent. Moreover, the inhibitory effect seen in SCID was abrogated by anti-CD11b antibody injection. PMN-MDSCs were significantly reduced in both spleens and tumors following Met treatment. In TAMs, production of IL-12 and TNF-α, but not IL-10, became apparent, and elevation of MHC class II with reduction of CD206 was observed, indicating a shift from an M2- to M1-like phenotype via Met administration. Metabolically, Met treatment decreased basal respiration and the oxygen consumption rate (OCR)/extracellular acidification rate (ECAR) ratio of CD11b+ cells in tumors, but not in the spleen. In addition, decreased reactive oxygen species (ROS) production and proton leakage in MDSCs and TAMs were consistently observed in tumors. Uptake of both 2-deoxy-2-d-glucose (2-NBDG) and BODIPY® decreased in MDSCs, but only BODIPY® incorporation was decreased in TAMs. Overall, our results suggest that Met redirects the metabolism of CD11b+ cells to lower oxidative phosphorylation (OXPHOS) while elevating glycolysis, thereby pushing the microenvironment to a state that inhibits the growth of certain tumors.

DOI： 10.1093/intimm/dxy079

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Language：Japanese   Publisher：(公社)日本口腔外科学会  

85歳男性。下顎歯右7を抜歯後に右側顎関節部の腫脹と自発痛が出現し、右側関節突起の著明な骨吸収を示す右側下顎骨骨髄炎と診断された。急性冠症候群に対する経皮的肝動脈形成術の既往歴がある。入院し抗菌薬(セファゾリンナトリウム、クリンダマイシン)投与を行ったが、硬結や開口障害は改善せず、第7病日に右側顎関節部を切開排膿した。膿汁にActinomyces israelii菌塊を認めたため顎放線菌症と診断し、抗菌薬をベンジルペニシリン持続投与に変更した。症状は改善したが抗菌薬変更後に頻回の下痢症状、無痛性新鮮血下血が出現した。下部消化管内視鏡で直腸軟膜の潰瘍と同部からの出血を認め、クリッピング術を行った。各検査所見は抗菌薬起因性大腸炎は否定的で、動脈硬化を背景とし感染症を伴う消耗と低栄養状態から臥床状態となったことにより発症した急性出血性直腸潰瘍(AHUR)と診断した。

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DOI： 10.21873/invivo.11443

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The ATP-binding cassette transporter G1 (ABCG1) is a cholesterol lipid efflux pump whose role in tumor growth has been largely unknown. Our transcriptomics revealed that ABCG1 was powerfully expressed in rapidly metastatic, aggregative colon cancer cells, in all the ABC transporter family members. Coincidently, genetic amplification of ABCG1 is found in 10-35% of clinical samples of metastatic cancer cases. Expression of ABCG1 was further elevated in three-dimensional tumoroids (tumor organoids) within stemness-enhancing tumor milieu, whereas depletion of ABCG1 lowered cellular aggregation and tumoroid growth in vitro as well as hypoxia-inducible factor 1α in cancer cells around the central necrotic areas in tumors in vivo. Notably, depletion of ABCG1 triggered the intracellular accumulation of extracellular vesicles (EVs) and regression of tumoroids. Collectively, these data suggest that ABCG1 plays a crucial role in tumorigenesis in metastatic cancer and that depletion of ABCG1 triggers tumor regression with the accumulation of EVs and their derivatives and cargos, implicating a novel ABCG1-targeting therapeutic strategy by which redundant and toxic substances may be accumulated in tumors leading to their regression.

DOI： 10.3389/fonc.2018.00376.

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DOI： 10.21873/anticanres.12132

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DOI： 10.1016/j.ebiom.2017.10.009

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DOI： 10.21873/anticanres.12060

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INTRODUCTION: In recent years, patients with orthognathic surgery in middle-aged and elderly people have come to be a more frequent occurrence. Breast cancer is the most frequently diagnosed cancer in woman worldwide, and its prevalence rate is steadily increasing. PRESENTATION OF CASE: We report a case of a 47-year-old Japanese woman in whom left-side breast cancer (Stage 1) was unexpectedly found just before orthognathic surgery in April 2012. Breast-conserving surgery was performed (estrogen receptor+, progesterone receptor+, HER2 -, surgical margin+, sentinel lymph node +) that May. From June to August docetaxel (75mg/m2) and cyclophosphamide (600mg/m2) were administrated four times every 21days and thereafter radiotherapy (total 60Gy) was completed. The cancer surgeon declared the prognosis good and the patient had a strong desire to undergo orthognathic surgery, so in November we performed a bimaxillary osteotomy, and administration of tamoxifen began 6 weeks after the osteotomy. DISCUSSION: There are breast cancer cases in which the prognosis is sufficiently good for a planned orthognathic surgery to proceed. Good communication among surgeons and the patient is important. CONCLUSION: We experienced a case in which breast cancer was found just before the orthognathic surgery; we performed a bimaxillary osteotomy, including follow-up tamoxifen administration, during breast cancer treatment.

DOI： 10.1016/j.ijscr.2016.12.014

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

Low-intensity pulsed ultrasound (LIPUS) has been used as an adjunct to fracture healing therapies, but the mechanisms underlying its action are not known. We reported that sonic hedgehog (SHH) signaling was activated in osteoblasts at the dynamic remodeling site of a bone fracture. Mechanical stimulation is a crucial factor in bone remodeling, and it is related to the primary cilia as a sensor of hedgehog signaling. Here we observed that LIPUS promoted callus formation in accord with Gli2-positive cells after 14 days at the mouse femur fractured site compared with a control group. An immunofluorescence analysis showed that the numbers of primary cilia and cilia/osterix double-positive osteoblasts were increased at the fracture site by LIPUS. LIPUS stimulated not only the number and the length of primary cilia, but also the levels of ciliated protein, Ift88 mRNA, and SHH, Gli1, and Gli2 in MC3T3-E1 cells. Further experiments revealed that LIPUS stimulated osteogenic differentiation in the presence of smoothened agonist (SAG) treatment. These results indicate that LIPUS stimulates osteogenic differentiation and the maturation of osteoblasts by a primary cilium-mediated activation of hedgehog signaling.

DOI： 10.1002/jcb.26418

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Publishing type：Research paper (scientific journal)   Publisher：Graphyonline Publications PVT, Ltd.  

DOI： 10.15344/2456-4443/2017/115

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DOI： 10.21873/anticanres.11230

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ltd  

DOI： 10.1016/j.ijso.2016.09.002

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Language：Japanese   Publishing type：Doctoral thesis  

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Language：English   Publisher：(一社)日本癌学会  

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Language：Japanese   Publisher：(一社)日本頭頸部癌学会  

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Language：Japanese   Publisher：(公社)日本栄養・食糧学会  

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Other Link： https://search-tp.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2018&ichushi_jid=J02382&link_issn=&doc_id=20180322250004&doc_link_id=%2Fdy8ortum%2F2018%2F003001%2F004%2F0023-0027%26dl%3D0&url=https%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Fdy8ortum%2F2018%2F003001%2F004%2F0023-0027%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

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DOI： 10.1158/1538-7445.AM2016-4865

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