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CD31 (PECAM-1) is platelet endothelial cell adhesion molecule-1, serves as the endothelial cell-specific receptor of clostridium perfringens b-Toxin (CPB). CD31 is also an ER-MP12 antigen, acts as a linker between mechanical stress, metabolism and inflammation. CD31 peptide is able to sustain phosphorylation of the CD31 ITIM686 and of SHP2 and to inhibit TCR-induced T-cell activation[1]-[5].

[1] Caligiuri G. Mechanotransduction, immunoregulation, and metabolic functions of CD31 in cardiovascular pathophysiology. Cardiovasc Res. 2019 Jul 1. 115(9):1425-1434. DOI:10.1093/cvr/cvz132
[2] Ling V, et al. Structural identification of the hematopoietic progenitor antigen ER-MP12 as the vascular endothelial adhesion molecule PECAM-1 (CD31). Eur J Immunol. 1997 Feb. 27(2):509-14. DOI:10.1002/eji.1830270223
[3] Bruggisser J, et al. CD31 (PECAM-1) Serves as the Endothelial Cell-Specific Receptor of Clostridium perfringens β-Toxin. Cell Host Microbe. 2020 Jul 8. 28(1):69-78.e6. DOI:10.1016/j.chom.2020.05.003
[4] Caligiuri G. CD31 as a Therapeutic Target in Atherosclerosis. Circ Res. 2020 Apr 24. 126(9):1178-1189. DOI:10.1161/CIRCRESAHA.120.315935
[5] Fornasa G, et al. TCR stimulation drives cleavage and shedding of the ITIM receptor CD31. J Immunol. 2010 May 15. 184(10):5485-92. DOI:10.4049/jimmunol.0902219