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研究者データベース 研究者詳細 ホーム English このページはJavascriptを使用しています。すべての機能を使用するためにはJavascript を有効にする必要があります。 　 基本情報 　 基本情報 　 学位 　 研究分野 　 研究活動 　 論文 　 書籍等出版物 　 MISC 　 講演・口頭発表等 　 科研費（文科省・学振・厚労省）獲得実績 　 寄附金・講座・研究部門 　 研究・技術シーズ 2024/02/06 更新 山下　善弘 (ヤマシタ　ヨシヒロ) YAMASHITA Yoshihiro 所属 医学部 医学科 感覚運動医学講座顎顔面口腔外科学分野 職名 教授 外部リンク このページの先頭へ▲ 学位 【 表示 ／ 非表示 】 このページの先頭へ▲ 学位 【 表示 ／ 非表示 】 博士（歯学） （ 2001年2月   九州歯科大学 ） このページの先頭へ▲ 研究分野 【 表示 ／ 非表示 】 このページの先頭へ▲ 研究分野 【 表示 ／ 非表示 】 ライフサイエンス / 外科系歯学 このページの先頭へ▲   論文 【 表示 ／ 非表示 】 このページの先頭へ▲ 論文 【 表示 ／ 非表示 】 Insufficiency of hepatocyte growth factor activator inhibitor-1 confers lymphatic invasion of tongue carcinoma cells Izumi A., Yamamoto K., Kawaguchi M., Yamashita F., Fukushima T., Kiwaki T., Tanaka H., Yamashita Y., Kataoka H. Cancer Science   113 ( 6 )   2179 - 2193   2022年6月 　詳細を見る 記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Cancer Science   Hepatocyte growth factor (HGF) activator inhibitor type-1 (HAI-1), encoded by the SPINT1 gene, is a transmembrane protease inhibitor that regulates membrane-anchored serine proteases, particularly matriptase. Here, we explored the role of HAI-1 in tongue squamous cell carcinoma (TSCC) cells. An immunohistochemical study of HAI-1 in surgically resected TSCC revealed the cell surface immunoreactivity of HAI-1 in the main portion of the tumor. The immunoreactivity decreased in the infiltrative front, and this decrease correlated with enhanced lymphatic invasion as judged by podoplanin immunostaining. In vitro homozygous deletion of SPINT1 (HAI-1KO) in TSCC cell lines (HSC3 and SAS) suppressed the cell growth rate but significantly enhanced invasion in vitro. The loss of HAI-1 resulted in enhanced pericellular activities of proteases, such as matriptase and urokinase-type plasminogen activator, which induced activation of HGF/MET signaling in the co-culture with pro-HGF-expressing fibroblasts and plasminogen-dependent plasmin generation, respectively. The enhanced plasminogen-dependent plasmin generation was abrogated partly by matriptase silencing. Culture supernatants of HAI-1KO cells had enhanced potency for converting the proform of vascular endothelial growth factor-C (VEGF-C), a lymphangiogenesis factor, into the mature form in a plasminogen-dependent manner. Furthermore, HGF significantly stimulated VEGF-C expression in TSCC cells. Orthotopic xenotransplantation into nude mouse tongue revealed enhanced lymphatic invasion of HAI-1KO TSCC cells compared to control cells. Our results suggest that HAI-1 insufficiency leads to dysregulated pericellular protease activity, which eventually orchestrates robust activation of protease-dependent growth factors, such as HGF and VEGF-C, in a tumor microenvironment to contribute to TSCC progression. DOI： 10.1111/cas.15346 Scopus PubMed Crucial role of high-mobility group box 2 in mouse ovarian follicular development through estrogen receptor beta Yamaguma Y., Sugita N., Choijookhuu N., Yano K., Lee D., Ikenoue M., Fidya , Shirouzu S., Ishizuka T., Tanaka M., Yamashita Y., Chosa E., Taniguchi N., Hishikawa Y. Histochemistry and Cell Biology   157 ( 3 )   359 - 369   2022年3月 　詳細を見る 記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Histochemistry and Cell Biology   High-mobility group box 2 (HMGB2) is a chromatin-associated protein that is an important regulator of gene transcription, recombination, and repair processes. The functional importance of HMGB2 has been reported in various organs, including the testis, heart, and cartilage. However, its role in the ovary is largely unknown. In this study, ovary tissues from wild-type (WT) and HMGB2-knock-out (KO) mice were examined by histopathological staining and immunohistochemistry. The ovary size and weight were significantly lower in HMGB2-KO mice than in age-matched WT littermates. Histopathological analysis revealed ovarian atrophy and progressive fibrosis in 10-month-old HMGB2-KO mouse ovaries. Compared to age-matched WT mice, the numbers of oocytes and developing follicles were significantly decreased at 2 months of age and were completely depleted at 10 months of age in HMGB2-KO mice. Immunohistochemistry revealed the expression of HMGB2 in the granulosa cells of developing follicles, oocytes, some corpora lutea, and stromal cells. Importantly, HMGB2-positive cells were co-localized with estrogen receptor beta (ERβ), but not ERα. Estrogen response element-binding activity was demonstrated by southwestern histochemistry, and it was decreased in HMGB2-KO mouse ovaries. Cell proliferation activity was also decreased in HMGB2-KO mouse ovaries in parallel with the decreased folliculogenesis. These results indicated that the depletion of HMGB2 induced ovarian atrophy that was characterized by a decreased ovarian size and weight, progressive fibrosis, as well as decreased oocytes and folliculogenesis. In conclusion, we demonstrated the crucial role of HMGB2 in mouse ovarian folliculogenesis through ERβ expression. DOI： 10.1007/s00418-022-02074-4 Scopus PubMed Role of Mel1/Prdm16 in bone differentiation and morphology Kaneda-Nakashima K., Igawa K., Suwanruengsri M., Naoyuki F., Ichikawa T., Funamoto T., Kurogi S., Sekimoto T., Yamashita Y., Chosa E., Yamaguchi R., Morishita K. Experimental Cell Research   410 ( 2 )   112969   2022年1月 　詳細を見る 記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Experimental Cell Research   MEL1 (MDS1/EVI1-like gene 1/PRDM16), a zinc finger protein, is located near the chromosomal breakpoint at 1p36 in human acute myeloid leukemia (AML) cells with the t (1; 3) (p36; q21) translocation. Mel1/Prdm16 is not only a causative gene of leukemia, but also has multiple regulatory functions, such as the regulation of fat metabolism. To investigate the function of Mel1/Prdm16, we generated Mel1/Prdm16-deficient mice, but homozygous deficiency (Mel1/Prdm16−/−) was embryonic lethal at E 11.5. Heterozygous mice showed abnormal cartilage and bone formation in the postnatal skull and long bones, suggesting that Mel1/Prdm16 expression plays an important role in bone development. In osteoblast and chondrocyte cell lines, Mel1/Prdm16 promotes the differentiation of chondrocytes and regulates the differentiation of osteoblasts. Transient repression of the master regulator Runx2 is required for chondrocyte differentiation at an early stage of differentiation. However, in Mel1/Prdm16-suppressed ATDC5 cells, the initial suppression of Runx2 was lacking and its expression was upregulated at the beginning of differentiation, suggesting that chondrogenic differentiation is suppressed in Mel1/Prdm16+/− mesenchymal progenitor cells because Runx2 expression is upregulated during the early stage of differentiation. Thus, the Mel1/Prdm16 gene may be involved in the early repression of Runx2 expression during osteochondral differentiation and promote chondrogenic differentiation. DOI： 10.1016/j.yexcr.2021.112969 Scopus PubMed Decreased prostasin expression is associated with aggressiveness of oral squamous cell carcinoma Yamamoto K., Yamashita F., Kawaguchi M., Izumi A., Kiwaki T., Kataoka H., Kaneuji T., Yamashita Y., Fukushima T. Human Cell   34 ( 5 )   1434 - 1445   2021年9月 　詳細を見る 記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Human Cell   Prostasin is a glycosylphosphatidylinositol-anchored serine protease widely expressed in epithelial cells, with crucial epidermal barrier functions. Evidence has suggested prostasin may have served as a tumor suppressor in various cancers, but its role in oral squamous cell carcinoma (OSCC) remains unclear. Thus, herein, we conducted an immunohistochemical prostasin study in 119 resected OSCC cases. Prostasin expression was decreased in 63% (75/119) of cases. OSCC with decreased prostasin immunoreactivity (low prostasin cases) tended to show a higher histological grade (p = 0.0088) and a more infiltrative cancer cell morphology (p = 0.0024). We then explored the role of prostasin in the OSCC cell lines: SAS and HSC-4. SAS did not express detectable prostasin levels, whereas HSC-4 expressed low but distinct levels. Prostasin overexpression suppressed the proliferation and migration of both OSCC lines in vitro. Conversely, prostasin silencing significantly enhanced growth rates of HSC-4. Finally, we analyzed the impact of prostasin expression on the prognosis of patients with OSCC; decreased expression tended to correlate with shorter overall survival (p = 0.0291) after resection. This trend was supported by our analyses using a public database (Kaplan–Meier plotter) of head and neck squamous cell carcinomas. In conclusion, we showed decreased prostasin expression was associated with aggressive features and a poorer prognosis of OSCC. DOI： 10.1007/s13577-021-00575-3 Scopus PubMed Pivotal role of the carbohydrate recognition domain in self-interaction of CLEC4A to elicit the ITIM-mediated inhibitory function in murine conventional dendritic cells in vitro Nasu J., Uto T., Fukaya T., Takagi H., Fukui T., Miyanaga N., Nishikawa Y., Yamasaki S., Yamashita Y., Sato K. International Immunology   32 ( 10 )   673 - 682   2021年 　詳細を見る 記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：International Immunology   C-type lectin receptors (CLRs), pattern recognition receptors (PRRs) with a characteristic carbohydrate recognition domain (CRD) in the extracellular portion, mediate crucial cellular functions upon recognition of glycosylated pathogens and self-glycoproteins. CLEC4A is the only classical CLR that possesses an intracellular immunoreceptor tyrosine-based inhibitory motif (ITIM), which possibly transduces negative signals. However, how CLEC4A exerts cellular inhibition remains unclear. Here, we report that the self-interaction of CLEC4A through the CRD is required for the ITIM-mediated suppressive function in conventional dendritic cells (cDCs). Human type 2 cDCs (cDC2) and monocytes display a higher expression of CLEC4A than cDC1 and plasmacytoid DCs (pDCs) as well as B cells. The extracellular portion of CLEC4A specifically binds to a murine cDC cell line expressing CLEC4A, while its extracellular portion lacking the N-glycosylation site or the EPS motif within the CRD reduces their association. Furthermore, the deletion of the EPS motif within the CRD or ITIM in CLEC4A almost completely impairs its suppressive effect on the activation of the murine cDC cell line, whereas the absence of the N-glycosylation site within the CRD exhibits partial inhibition on their activation. On the other hand, antagonistic monoclonal antibody (mAb) to CLEC4A, which inhibits the self-interaction of CLEC4A and its downstream signaling in murine transfectants, enhances the activation of monocytes and monocyte-derived immature DCs upon stimulation with a Toll-like receptor (TLR) ligand. Thus, our findings suggest a pivotal role of the CRD in self-interaction of CLEC4A to elicit the ITIM-mediated inhibitory signal for the control of the function of cDCs. DOI： 10.1093/INTIMM/DXAA034 Scopus PubMed 全件表示 >> このページの先頭へ▲ 書籍等出版物 【 表示 ／ 非表示 】 このページの先頭へ▲ 書籍等出版物 【 表示 ／ 非表示 】 知っておきたい顎・歯・口腔の画像診断 近藤雄大、中村友梨、山下善弘（ 担当： 共著） 株式会社学研メデイカル秀潤社  2017年8月  　詳細を見る 記述言語：日本語 著書種別：学術書 ガイドライン外来診療 2017 有村慶一、近藤雄大、山下善弘（ 担当： 共著） 日経メディカル開発  2017年2月  　詳細を見る 記述言語：日本語 著書種別：一般書・啓蒙書 みやざきの医療 近藤雄大、山下善弘（ 担当： 共著） 朝日新聞  2017年1月  　詳細を見る 記述言語：日本語 Clinical applications of robotic image-guided fractionated stereotactic radiotherapy for recurrent oral squamous cell carcinoma patients who cannot undergo surgery in Oral Cancer: Symptoms, Management and Risk Factors; Nova Science Publishers Yamashita Y., Yamamoto N., Tanaka T., Oda M., Miyamoto I., Yoshiga D., Nogami S., Kito S., Wakasugi-Sato N., Matsumoto-Takeda S., Ishikawa A., Matsuo K., Koga H., Ozeki S., Takahashi T., Morimoto Y.（ 担当： 共著） Nova Science Publishers  2013年12月  　詳細を見る 記述言語：英語 著書種別：学術書 このページの先頭へ▲ MISC 【 表示 ／ 非表示 】 このページの先頭へ▲ MISC 【 表示 ／ 非表示 】 Combination therapy of Mohs paste and chemotherapy improved metastatic oral cancer to the precordium skin and bilateral axillary lymph nodes: A case report Yamaguma Y., Kaneuji T., Shirouzu S., Fukui T., Nakamura Y., Hirayama B., Kiyomiya H., Nagata J., Yamashita Y. Oral Oncology   127   105817   2022年4月 　詳細を見る 記述言語：日本語   掲載種別：速報，短報，研究ノート等（学術雑誌）   出版者・発行元：Oral Oncology   Although Mohs paste can control bleeding, exudates, and odors from tumors, there have been no reports of the combination of Mohs paste with other treatments, such as chemotherapy, in oral cancer. Here, we report the combination of Mohs paste and chemotherapy for a case of metastatic oral cancer to the precordium skin and bilateral axillary lymph nodes. The tumors almost completely disappeared after the treatment. Combination therapy of Mohs paste and chemotherapy appears to have a better antitumor effect than Mohs paste alone. DOI： 10.1016/j.oraloncology.2022.105817 Scopus PubMed Author Correction: Pivotal role of CD103 in the development of psoriasiform dermatitis (Scientific Reports, (2020), 10, 1, (8371), 10.1038/s41598-020-65355-9) Fukui T., Fukaya T., Uto T., Takagi H., Nasu J., Miyanaga N., Nishikawa Y., Koseki H., Choijookhuu N., Hishikawa Y., Yamashita Y., Sato K. Scientific Reports   10 ( 1 )   16375   2020年12月 　詳細を見る 記述言語：日本語   掲載種別：速報，短報，研究ノート等（学術雑誌）   出版者・発行元：Scientific Reports   This Article contains errors in the Methods section, under the subheading ‘Generation of Cd103-/- mice’, “The linearized targeting construct was introduced by electroporation into C57BL/6-derived JN/2 recombinant embryonic stem cell (ESC) and neomycin-resistant clones were first screened for homologous recombination by PCR utilizing a pair of the following oligonucleotides: Primer 1 (5&＃39;-ATA TGT AGT GTC TGG TCA GGA TAA TAG TTG-3&＃39;) and Primer 2 (5&＃39;-ATA ACC TCC TCT CCT ATG GTA CCT AAA C-3&＃39;).” should read: “The linearized targeting construct was introduced by electroporation into C57BL/6-derived JN/2 recombinant embryonic stem cell (ESC) and neomycin-resistant clones were first screened for homologous recombination by PCR utilizing a pair of the following oligonucleotides: Primer 1 (5&＃39;-ATA TGT AGT GTC TGG TCA GGA TAA TAG TTG-3&＃39;) and Primer 3 (5&＃39;-ATA ACC TCC TCT CCT ATG GTA CCT AAA C-3&＃39;).” “Transmission of the targeted allele was confirmed by PCR with Primer 1 and Primer 3 (5&＃39;-CTT TAT ATT TCA TTT TTG CTC AGG CTT C-3&＃39;). The mutant mice were cross-mated for more than nine generations with B6.FLIP mice to excise the flanked FRT sites by Flp-recombinase, and 8- to 12-week-old Cd103+/+ littermates were used as WT mice. Then, Cd103+/- littermates were crossed to obtain homozygotes, and transmission of the targeted allele was confirmed by PCR with Primer 1 and Primer 3.” should read: “Transmission of the targeted allele was confirmed by PCR with Primer 1 and Primer 2 (5&＃39;-CTT TAT ATT TCA TTT TTG CTC AGG CTT C-3&＃39;). The mutant mice were cross-mated for more than nine generations with B6.FLIP mice to excise the flanked FRT sites by Flp-recombinase, and 8- to 12-week-old Cd103+/+ littermates were used as WT mice. Then, Cd103+/- littermates were crossed to obtain homozygotes, and transmission of the targeted allele was confirmed by PCR with Primer 1 and Primer 2”. DOI： 10.1038/s41598-020-71156-x Scopus PubMed A case of mucositis due to the allergy to self-curing resion. Oral Science International, Hashimoto K*., Naganuma K., Yamashita Y., Ikebe T., Ozeki S Oral Science International   11   37 - 39   2014年1月 　詳細を見る 記述言語：英語   掲載種別：記事・総説・解説・論説等（学術雑誌）   出版者・発行元：ELSEVIER   A case of mucositis due to the allergy to self-curing resion. Hashimoto K*., Naganuma K., Yamashita Y., Ikebe T., Ozeki S. Oral Science International   11   37 - 39   2014年1月 　詳細を見る 記述言語：英語   掲載種別：記事・総説・解説・論説等（学術雑誌）   出版者・発行元：Elisevier   A case of mucositis due to the allergy to self-curing resion. Oral Science International, Hashimoto K*., Naganuma K., Yamashita Y., Ikebe T., Ozeki S Oral Science International   11   37 - 39   2014年1月 　詳細を見る 記述言語：英語   掲載種別：記事・総説・解説・論説等（学術雑誌）   出版者・発行元：ELSEVIER   全件表示 >> このページの先頭へ▲ 講演・口頭発表等 【 表示 ／ 非表示 】 このページの先頭へ▲ 講演・口頭発表等 【 表示 ／ 非表示 】 口腔内に初発症状を呈した特発性血小板減少性紫斑病の１例 髙森晃一，長井健太郎，酒井博史，迫田隅男，山下善弘 第26回（一社）日本有病者歯科医療学会　総会・学術大会  　詳細を見る 開催年月日： 2017年3月4日 - 2017年3月5日 記述言語：日本語   会議種別：ポスター発表   β-TCPを用いた血管柄付骨組織再生に関する実験的研究 山本晃士、近藤雄大、金氏毅、末廣雄作、山口良二、片岡寛章、橋本憲一郎、池邉哲郎、山下善弘 第35回 日本口腔腫瘍学会総会  　詳細を見る 開催年月日： 2017年1月26日 - 2017年1月28日 記述言語：日本語   会議種別：ポスター発表   NDRG2発現と4NQO 投与による OSCC 発癌・転移機構の関連性の検討 田村知丈1 共同演者　市川朝永2、近藤雄大1、田川友梨1、山本晃士1、中畑新吾2、森下和広2、山下善弘1 第35回　日本口腔科学会学術集会  　詳細を見る 開催年月日： 2017年1月26日 - 2017年1月27日 記述言語：日本語   会議種別：ポスター発表   Clinical and histopathological evaluation of malignant transformation in oral leukoplakia in our department 招待あり 国際会議 Yohei Uemura, Takashi Baba, Yuudai Kondo, Yoshihiro Yamashita The Third Myanmar-Japan Symposium   　詳細を見る 開催年月日： 2016年12月3日 - 2016年12月4日 記述言語：英語   会議種別：口頭発表（一般）   エナメル上皮手術後の狭小な下顎骨に対して、骨延長術を併用して治療を行った１例 末廣雄作、近藤雄大、金氏毅、田中純一郎、福井丈仁、野海健太、長井健太郎、山下善弘 第61回日本口腔外科学会総会・学術大会  　詳細を見る 開催年月日： 2016年11月26日 記述言語：日本語   会議種別：口頭発表（一般）   全件表示 >> このページの先頭へ▲ 科研費（文科省・学振・厚労省）獲得実績 【 表示 ／ 非表示 】 このページの先頭へ▲ 科研費（文科省・学振・厚労省）獲得実績 【 表示 ／ 非表示 】 口腔扁平上皮癌におけるリンパ節転移の新規遺伝子診断アルゴリズムの確立 研究課題/領域番号：21K10119  2021年04月 - 2026年03月 独立行政法人日本学術振興会  科学研究費補助金  基盤研究(C) 　詳細を見る 担当区分：研究代表者  人工呼吸器管理患者における高感度濁度計の口腔清潔度評価としての有用性の検討 2015年04月 - 2017年04月 科学研究費補助金  基盤研究(C) 人工骨補填材を用いた生体内での血管柄付骨組織再生に関する実験的研究 2011年04月 - 2016年03月 科学研究費補助金  基盤研究(C) 　詳細を見る 担当区分：研究代表者  人工骨補填材を用いた生体内での血管柄付骨組織再生に関する実験的研究 このページの先頭へ▲ 寄附金・講座・研究部門 【 表示 ／ 非表示 】 このページの先頭へ▲ 寄附金・講座・研究部門 【 表示 ／ 非表示 】 感覚運動医学講座顎顔面口腔外科学分野研究奨学金 寄附者名称：社会医療法人善仁会 2020年02月 感覚運動医学講座顎顔面口腔外科学分野研究奨学金 寄附者名称：宮崎県歯科医師会 2019年08月 感覚運動医学講座顎顔面口腔外科学分野研究奨学金 寄附者名称：藤元メディカルシステム 2019年07月 感覚運動医学講座顎顔面口腔外科学分野研究奨学金 寄附者名称：一般財団法人弘潤会 2019年07月 感覚運動医学講座顎顔面口腔外科学分野研究奨学金  2018年11月 このページの先頭へ▲ 研究・技術シーズ 【 表示 ／ 非表示 】 このページの先頭へ▲ 研究・技術シーズ 【 表示 ／ 非表示 】 腔癌における発癌・転移・浸潤関連因子に関する基礎研究・応用研究 腔外科疾患における新しい治療法・診断法の開発 腔機能・口腔内細菌と全身疾患との関連性の解明 　詳細を見る 技術相談に応じられる関連分野：口腔癌、口腔機能、口腔内細菌、口腔と全身疾患との関連、低侵襲手術（内視鏡　顕微鏡等） メッセージ：共同研究が可能なテーマ：口腔癌の基礎・応用研究、口腔機能・口腔内細菌の分析、口腔と全身疾患との関連性の解明、低侵襲手術（内視鏡　顕微鏡等）の技術開発 このページの先頭へ▲   Copyright © University of Miyazaki. 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