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. 1986 Nov;83(21):8351–8355. doi: 10.1073/pnas.83.21.8351

Platelet glycoproteins IIb and IIIa: evidence for a family of immunologically and structurally related glycoproteins in mammalian cells.

I F Charo, L A Fitzgerald, B Steiner, S C Rall Jr, L S Bekeart, D R Phillips
PMCID: PMC386926  PMID: 3534886

Abstract

Human and bovine cultured cell lines and circulating leukocytes were examined for the presence of surface proteins similar to platelet glycoproteins IIb (GPIIb) and IIIa (GPIIIa). Human endothelial cells, smooth muscle cells, and MG-63 fibroblast-like cells were found to have surface proteins that cross-reacted with platelet GPIIb and GPIIIa antibodies, existed as complexes, and had molecular weights similar to those of the corresponding platelet glycoproteins. Bovine endothelial cells and smooth muscle cells also expressed GPIIb- and GPIIIa-like surface proteins. Metabolic labeling studies with [35S]methionine demonstrated that the cultured cells synthesized these glycoproteins. The GPIIIa-like protein in human endothelial and smooth muscle cells had the same isoelectric point as platelet GPIIIa, whereas their GPIIb alpha-like protein was slightly more acidic than platelet GPIIb alpha (pI = 5.2-5.3 versus 5.5). Platelet and endothelial cell GPIIb alpha (but not GPIIIa) showed an increased electrophoretic mobility in Ca2+ -containing versus EDTA-containing gels, implying a Ca2+ -GPIIb alpha interaction. The amino acid sequence of the amino termini of platelet GPIIb alpha and GPIIb beta and of the alpha chains of the leukocyte LFA-1 and Mac-1 glycoprotein complexes had significant sequence homology. These data indicate that glycoproteins that have either immunological cross-reactivity or amino-terminal sequence homology with the platelet GPIIb-IIIa complex are widely distributed in human and non-human adherent cells and circulating leukocytes and suggest that these proteins may be the products of a large gene family whose expression is cell specific.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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