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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 Ca2+ Endothelial cell PECAM-1 Transmigration |
Issue Date: | 2004 | Citation: | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/29052 | ISSN: | 0006291X |
Appears in Collections: | Staff Publications |
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