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Thromb Haemost 2022; 122(06): 961-973
DOI: 10.1055/a-1663-8108
Cellular Haemostasis and Platelets

Mice Lacking PECAM-1 and Ceacam1 Have Enhanced Platelet Secretion and Thrombus Growth: Novel Link with PAR4

Fahd A. Kuriri
1   Thrombosis and Vascular Diseases Laboratory, School of Health and Biomedical Sciences, STEM College, RMIT University, Bundoora, Victoria, Australia
2   Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra, Riyadh Province, Saudi Arabia
,
Genia Burchall
1   Thrombosis and Vascular Diseases Laboratory, School of Health and Biomedical Sciences, STEM College, RMIT University, Bundoora, Victoria, Australia
,
Fehaid Alanazi
1   Thrombosis and Vascular Diseases Laboratory, School of Health and Biomedical Sciences, STEM College, RMIT University, Bundoora, Victoria, Australia
3   Department of Clinical Laboratory Sciences, College of Applied Medical Sciences-AlQurayyat, Jouf University, Saudi Arabia
,
Juliana Antonipillai
1   Thrombosis and Vascular Diseases Laboratory, School of Health and Biomedical Sciences, STEM College, RMIT University, Bundoora, Victoria, Australia
,
Gasim Dobie
4   Department of Medical Laboratory Technology, Jazan University, Jazan, Saudi Arabia
,
Nicole Beachemin
5   Department of Oncology, Medicine and Biochemistry, Goodman Cancer Research Centre, McGill University, Montreal, Canada
,
Denise E. Jackson
1   Thrombosis and Vascular Diseases Laboratory, School of Health and Biomedical Sciences, STEM College, RMIT University, Bundoora, Victoria, Australia
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Abstract

The Ig-ITIM bearing receptors, PECAM-1 and CEACAM1, have been shown net negative regulators of platelet–collagen interactions and hemiITAM signaling pathways. In this study, a double knockout (DKO) mouse was developed with deleted PECAM-1 and CEACAM1 to study their combined contribution in platelet activation by glycoprotein VI, C-type lectin-like receptor 2, protease activated receptor (PAR4), ADP purinergic receptors, and thromboxane receptor (TP) A2 pathways. In addition, their collective contribution was examined in thrombus formation under high shear and microvascular thrombosis using in vivo models. DKO platelets responded normally to ADP purinergic receptors and the TP A2 pathway. However, DKO platelets released significantly higher amounts of P-selectin compared with hyper-responsive Pecam-1−/− or Ceacam1−/− versus wild-type (WT) upon stimulation with collagen-related peptide or rhodocytin. In contrast, DKO platelets showed increased amounts of P-selectin exposure upon stimulation with PAR4 agonist peptide or thrombin but not Pecam-1−/− , Ceacam1−/− , or WT platelets. Blockade of phospholipase C (PLC) or Rho A kinase revealed that DKO platelets enhanced α-granule release via PAR4/Gαq/PLC signaling without crosstalk with Src/Syk or G12/13 signaling pathways. Severely delayed clot retraction in vitro was observed in DKO phenotype. The DKO model revealed a significant increase in thrombus formation compared with the hyper-responsive Ceacam1−/− or Pecam-1−/− versus WT phenotype. DKO platelets have similar glycoprotein surface expression compared with Pecam-1−/− , Ceacam1−/− , and WT platelets. This study demonstrates that PECAM-1 and CEACAM1 work in concert to negatively regulate hemiITAM signaling, platelet–collagen interactions, and PAR4 Gαq protein- coupled signaling pathways. Both PECAM-1 and CEACAM1 are required for negative regulation of platelet activation and microvascular thrombosis in vivo.

Keywords

pecam-1 - ceacam1 - ITIM - PAR4 - GPCR signaling - platelets

Author Contributions

F.A.K., F.A., G.D., and J.A. performed the experiments. G.B. and N.B. provided intellectual input and reviewed the paper; D.E.J. directed the research and wrote the manuscript.




Publication History

Received: 01 December 2020

Accepted: 05 October 2021

Accepted Manuscript online:
07 October 2021

Article published online:
28 December 2021

© 2021. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 

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