Identification of a novel transcript of human PECAM-1 and its role in the transendothelial migration of monocytes and Ca2+ mobilization

Heming Wei, Jie Song, Lu Fang, Guodong Li, Subroto Chatterjee

Research output: Contribution to journalArticle

Abstract

Platelet-endothelial cell adhesion molecule-1 (PECAM-1) is an integral component of endothelial cells and has been implicated in the transendothelial migration (TEM) of circulating leukocytes mediated by its 1st and 2nd extracellular immunoglobulin (Ig)-like domains and regulation of intracellular Ca2+ homeostasis with its 6th domain. Up-to-date, little is known about the role of the 5th extracellular (Ig)-like domain. We have discovered a novel human PECAM-1 transcript missing the entire 7th exon, which encodes the 5th extracellular (Ig)-like domain of PECAM-1. A synthetic peptide with sequence homology to the 5th domain of PECAM-1 (JHS-7 peptide) and a corresponding polyclonal antibody (JHS-7 Ab) were prepared and their potential role in transendothelial migration and Ca2+ influx was measured. The JHS-7 peptide and the antibody exerted a dose dependent decrease (50-80%) in the transendothelial migration of freshly isolated human monocytes and a promonocytic cell line (U-937) in resting HUVECs and HUVECs activated with tumor necrosis factor-α. This was accompanied by an increase in Ca2+ influx and decrease in refilling of the intracellular Ca2+ stores in HUVECs. In summary, we have identified a novel PECAM-1 transcript (Δexon 7) and shown that the 5th (Ig)-like domain of PECAM-1 plays a role in monocyte TEM and Ca2+ homeostasis.

Original languageEnglish (US)
Pages (from-to)1228-1235
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume320
Issue number4
DOIs
StatePublished - Aug 6 2004

Keywords

  • Atherosclerosis
  • Ca
  • Endothelial cell
  • PECAM-1
  • Transmigration

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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