The Role of ITAM- and ITIM-coupled Receptors in Platelet Activation by Collagen

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Abstract
The major activation-inducing collagen receptor glycoprotein VI (GPVI) has been cloned within the last two years. It is a member of the Ig superfamily of proteins and is constitutively associated with the ITAM-bearing Fc receptor γ-chain (FcR γ-chain). GPVI signals through a pathway that involves several of the proteins used by Fc, B- and T-lymphocyte receptors and which takes place in glycolipid-enriched membrane domains in the plasma membrane known as GEMs. Responses to GPVI are regulated by PECAM-1 (CD31) and possibly other ITIM-bearing receptors. Despite a pivotal role for GPVI, there are important differences between signalling events to collagen and GPVI-specific ligands. This may reflect a role for co-receptors in the response to collagen. 2 Present address: Department of Clinical and Laboratory Medicine, Yamanashi Medical College, Shimokato 1110, Tamaho, Nakakoma, Yamanashi 409-38, Japan