Platelet-derived growth factor and its receptors are expressed in areas of both active inflammation and active fibrosis in inflammatory bowel disease

Shinji Kumagai, Haruo Ohtani, Tadashi Nagai, Keiko Funa, Nobuo Hiwatashi, Tooru Shimosegawa, Hiroshi Nagura

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The aim of the present study is to clarify in situ expression of platelet-derived growth factor (PDGF) and its receptors in different phases of inflammatory bowel disease (IBD). Tissues samples were obtained from 20 patients with ulcerative colitis (UC) and 29 with Crohn's disease (CD) at surgery. In situ hybridization and immunohistochemistry on frozen sections were performed for PDGF-A and -B and its α and β receptors (αR and βR). The area of active inflammation was infiltrated by abundant polymorphonuclear and mononuclear leukocytes, of which the latter expressed mRNA and proteins of PDGF-A, -B, and -αR and mRNA for PDGF-βR. The area of active fibrosis, characterized by activated fibroblasts/myofibroblasts, was juxtaposed to ulceration, which is induced as a repair process to tissue destruction. In these areas, activated fibroblasts/myofibroblasts were positive for mRNA and protein of PDGF-A, -B, -αR, and -βR. The expression of PDGF-A, -B, and -αR declined significantly in the scar area. Our results suggest that PDGF is not only important as an inducer of fibrosis in the repair phase but also it is involved in the active inflammatory phase possibly as a chemoattractant for mononuclear inflammatory cells.

Original languageEnglish
Pages (from-to)21-33
Number of pages13
JournalTohoku Journal of Experimental Medicine
Volume195
Issue number1
DOIs
Publication statusPublished - 2001

Keywords

  • Inflammatory bowel disease
  • PDGF receptor
  • PGDF

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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