Vascular endothelial growth factor activates MAP kinase and enhances collagen synthesis in human mesangial cells

Tetsuro Amemiya, Hiroyuki Sasamura, Mizuo Mifune, Yudai Kitamura, Junichi Hirahashi, Matsuhiko Hayashi, Takao Saruta

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Background. Vascular endothelial growth factor (VEGF) is an endothelial mitogen that is constitutively expressed in normal human glomeruli, but its role in the kidney is still unclear. In this study, we examined the effects of VEGF on human mesangial cells (HMCs). Methods and Results. Reverse transcription-polymerase chain reaction analysis demonstrated the presence of VEGF receptor mRNA (flt-1 and KDR) in HMCs. The treatment of HMCs with VEGF did not cause a change in 3H-thymidine incorporation or cell numbers. In contrast, VEGF caused a dose- and time-dependent increase in collagen synthesis, with threefold to fivefold increases in both cell-associated and secreted collagen synthesis seen after treatment with 200 ng/ml VEGF. The effects of VEGF were attenuated by treatment of HMCs with the tyrosine kinase inhibitor herbimycin A or the MEK inhibitor PD 98059, but not with the protein kinase C (PKC) inhibitor chelerythrine. VEGF treatment also caused a marked increase in p42/p44 mitogen-activated protein kinase (MAPK) activity, but had no significant effect on HMC superoxide production. Finally, an increase in collagen synthesis was also seen in rat mesangial cells treated with VEGF. Conclusions. These results suggest that VEGF is not a mitogenic signal in HMCs, but may be involved in the regulation of the mesangial matrix in humans by a MAPK-dependent mechanism.

Original languageEnglish
Pages (from-to)2055-2063
Number of pages9
JournalKidney international
Volume56
Issue number6
DOIs
Publication statusPublished - 1999 Jan 1

Keywords

  • Angiogenesis
  • Injury
  • Mesangial matrix
  • Mitogen activated protein kinase
  • VEGF

ASJC Scopus subject areas

  • Nephrology

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