Crossref journal-article
American Society of Hematology
Blood (234)
Abstract

Platelet responses to collagen are mediated by the combined actions of the integrin α2β1, which serves as a major collagen-binding receptor, and the GPVI/FcRγ-chain complex, which transmits collagen-specific activation signals into the cell interior through the action of an immunoreceptor tyrosine-based activation motif within the cytoplasmic domain of the FcRγ-chain. Despite much progress in identifying components of the signaling pathway responsible for collagen-induced platelet activation, virtually nothing is known about the regulatory elements that modulate this important hemostatic event. PECAM-1, a recently recognized member of the inhibitory receptor family, contains a functional immunoreceptor tyrosine-based inhibitory motif within its cytoplasmic domain that, when tyrosine phosphorylated, recruits and activates the protein–tyrosine phosphatase, SHP-2. To test the hypothesis that PECAM-1 functions to regulate GPVI/FcRγ-chain–mediated platelet activation, the responses of wild-type versus PECAM-1–deficient murine platelets to GPVI-specific agonists were compared. Four distinct GPVI/FcRγ-chain–dependent responses were found to be significantly exaggerated in platelets derived from PECAM-1–deficient mice, including Mg++-independent adhesion to immobilized fibrillar collagen, collagen-induced platelet aggregation, platelet aggregation induced by the GPVI-specific agonist collagen-related peptide, and GPVI/FcRγ-chain–induced dense granule secretion. Together, these data provide compelling evidence that PECAM-1 modulates platelet responses to collagen, and they implicate this novel member of the inhibitory receptor family in the regulation of primary hemostasis.

Bibliography

Patil, S., Newman, D. K., & Newman, P. J. (2001). Platelet endothelial cell adhesion molecule-1 serves as an inhibitory receptor that modulates platelet responses to collagen. Blood, 97(6), 1727–1732.

Authors 3
  1. Sonali Patil (first)
  2. Debra K. Newman (additional)
  3. Peter J. Newman (additional)
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Dates
Type When
Created 23 years ago (July 27, 2002, 8:46 a.m.)
Deposited 1 year, 7 months ago (Jan. 6, 2024, 1:43 a.m.)
Indexed 2 months, 2 weeks ago (June 10, 2025, 3:04 p.m.)
Issued 24 years, 5 months ago (March 15, 2001)
Published 24 years, 5 months ago (March 15, 2001)
Published Print 24 years, 5 months ago (March 15, 2001)
Funders 0

None

@article{Patil_2001, title={Platelet endothelial cell adhesion molecule-1 serves as an inhibitory receptor that modulates platelet responses to collagen}, volume={97}, ISSN={0006-4971}, url={http://dx.doi.org/10.1182/blood.v97.6.1727}, DOI={10.1182/blood.v97.6.1727}, number={6}, journal={Blood}, publisher={American Society of Hematology}, author={Patil, Sonali and Newman, Debra K. and Newman, Peter J.}, year={2001}, month=mar, pages={1727–1732} }