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- Material Type
- 文書・図像類
- Author/Editor
- 山本, 晋也
- Author Heading
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- Alternative Title
- Platelet-derived growth factor receptor regulates salivary gland morphogenesis via fibroblast growth factor expression
- Text Language Code
- jpn
- Target Audience
- 一般
- Note (General)
- 2009-2010年度科学研究費補助金(若手研究(B))研究成果報告書 課題番号：21792089 研究代表者：山本晋也 (鹿児島大学医学部・歯学部附属病院助教)マウス顎下腺の器官培養において、PDGF-AAあるいはPDGF-BBを添加すると、その受容体は間葉に存在しているのにも関わらず、唾液腺組織の上皮細胞増殖が亢進し、分岐形態形成が促進され、PDGF-A及びB siRNAを用いてPDGF mRNA発現の抑制を行なった場合、上皮組織での細胞増殖が抑えられ分岐形態形成が減少した。一方、PDGF-AAはFGF3とFGF7の発現を誘導し、PDGF-BB はFGF1、FGF3、FGF7及びFGF10の発現を誘導した。しかしPDGF-A及びB siRNAはFGF3、FGF7、FGF10の発現を抑制した。この結果は、PDGFが顎下腺間葉におけるFGFの発現を制御していることを示唆している。A coordinated reciprocal interaction between epithelium and mesenchyme is involved in salivary gland morphogenesis. The submandibular glands (SMGs) of Wnt1-Cre/R26R mice have been shown positive for mesenchyme, whereas the epithelium is beta-galactosidase-negative, indicating that most mesenchymal cells are derived from cranial neural crest cells. Platelet-derived growth factor (PDGF) receptor alpha is one of the markers of neural crest-derived cells. In this study, we analyzed the roles of PDGFs and their receptors in the morphogenesis of mouse SMGs. PDGF-A was shown to be expressed in SMG epithelium, whereas PDGF-B, PDGFRalpha, and PDGFRbeta were expressed in mesenchyme. Exogenous PDGF-AA and -BB in SMG organ cultures demonstrated increased levels of branching and epithelial proliferation, although their receptors were found to be expressed in mesenchyme. In contrast, short interfering RNA for Pdgfa and -b as well as neutralizing antibodies for PDGF-AB and -BB showed decreased branching. PDGF-AA induced the expression of the fibroblast growth factor genes Fgf3 and -7, and PDGF-BB induced the expression of Fgf1, -3, -7, and -10, whereas short interfering RNA for Pdgfa and Pdgfb inhibited the expression of Fgf3, -7, and -10, indicating that PDGFs regulate Fgf gene expression in SMG mesenchyme. The PDGF receptor inhibitor AG-17 inhibited PDGF-induced branching, whereas exogenous FGF7 and -10 fully recovered. Together, these results indicate that fibroblast growth factors function downstream of PDGF signaling, which regulates Fgf expression in neural crest-derived mesenchymal cells and SMG branching morphogenesis. Thus, PDGF signaling is a possible mechanism involved in the interaction between epithelial and neural crest-derived mesenchyme.