Fibromodulin Expression in Folliculostellate Cells and Pericytes Is Promoted by TGFβ Signaling in Rat Anterior Pituitary Gland

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Author(s)

    • Syaidah Rahimi
    • Division of Histology and Cell Biology, Department of Anatomy, Jichi Medical University School of Medicine
    • Tsukada Takehiro
    • Division of Histology and Cell Biology, Department of Anatomy, Jichi Medical University School of Medicine
    • Azuma Morio
    • Division of Histology and Cell Biology, Department of Anatomy, Jichi Medical University School of Medicine
    • Horiguchi Kotaro
    • Laboratory of Anatomy and Cell Biology, Department of Health Sciences, Kyorin University
    • Fujiwara Ken
    • Division of Histology and Cell Biology, Department of Anatomy, Jichi Medical University School of Medicine
    • Kikuchi Motoshi
    • Division of Histology and Cell Biology, Department of Anatomy, Jichi Medical University School of Medicine|Laboratory of Natural History, Jichi Medical University School of Medicine
    • Yashiro Takashi
    • Division of Histology and Cell Biology, Department of Anatomy, Jichi Medical University School of Medicine

Abstract

<p>Fibromodulin belongs to the family of small leucine-rich proteoglycans (SLRPs), an active component of extracellular matrix. It directly binds collagens to promote fibrillogenesis and also binds transforming growth factor-beta (TGFβ) to antagonize its actions. Our previous studies of rat anterior pituitary gland revealed that fibromodulin is expressed in folliculostellate cells and pericytes. Although our recent study showed that TGFβ2 secreted from folliculostellate cells induces collagen synthesis in pericytes, the involvement of fibromodulin in TGFβ2-mediated collagen regulation has not been studied. The present study examined the effect of TGFβ2 on fibromodulin synthesis in rat anterior pituitary gland. <i>In situ</i> hybridization for TGFβ receptor II and immunohistological techniques revealed the presence of TGFβ receptor II in folliculostellate cells and pericytes. To confirm canonical TGFβ intracellular signaling, Smad2 immunocytochemistry was performed. Nuclear translocation of Smad2 was observed in folliculostellate cells and pericytes after TGFβ2 treatment. TGFβ2 strongly enhanced fibromodulin mRNA and protein expressions, and TGFβ2-induced mRNA expression was completely blocked by TGFβ receptor I inhibitor (SB431542). These results suggest that folliculostellate cells and pericytes exhibit canonical TGFβ2 signaling, which is associated with fibromodulin production. Thus, this is the first report to show that TGFβ signaling regulates the endogenous TGFβ antagonist fibromodulin in the gland.</p>

Journal

  • ACTA HISTOCHEMICA ET CYTOCHEMICA

    ACTA HISTOCHEMICA ET CYTOCHEMICA 49(6), 171-179, 2016

    JAPAN SOCIETY OF HISTOCHEMISTRY AND CYTOCHEMISTRY

Codes

  • NII Article ID (NAID)
    130006856400
  • Text Lang
    ENG
  • ISSN
    0044-5991
  • Data Source
    J-STAGE 
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