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Title: Identification of a novel transcript of human PECAM-1 and its role in the transendothelial migration of monocytes and Ca2+mobilization
Authors: Wei, H.
Song, J.
Fang, L.
Chatterjee, S. 
Li, G. 
Keywords: Atherosclerosis
Endothelial cell
Issue Date: 2004
Source: Wei, H., Song, J., Fang, L., Chatterjee, S., Li, G. (2004). Identification of a novel transcript of human PECAM-1 and its role in the transendothelial migration of monocytes and Ca2+mobilization. Biochemical and Biophysical Research Communications 320 (4) : 1228-1235. ScholarBank@NUS Repository.
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. © 2004 Elsevier Inc. All rights reserved.
Source Title: Biochemical and Biophysical Research Communications
ISSN: 0006291X
DOI: 10.1016/j.bbrc.2004.05.226
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