Platelet calcium signaling

Platelet calcium signaling is a fundamental biological process that orchestrates platelet activation, aggregation, and procoagulant activity in response to vascular injury [1, 2]. This complex signaling network is initiated by the activation of various surface receptors, including G protein-coupled receptors (GPCRs) like P2Y1, P2Y12, and PAR1/4, as well as immunoreceptor tyrosine-based activation motif (ITAM)-linked receptors such as GPVI [1, 4]. These receptors trigger the activation of phospholipase C (PLC) isoforms, leading to the production of inositol 1,4,5-trisphosphate (IP3), which releases calcium from the dense tubular system [2, 9]. The resulting depletion of intracellular stores activates store-operated calcium entry (SOCE) through the STIM1/Orai1 complex, causing a sustained rise in cytosolic calcium levels [2, 10]. This elevation is critical for downstream events such as integrin alphaIIbbeta3 activation, granule secretion, and the exposure of procoagulant phosphatidylserine [7, 9]. Dysregulation of this pathway is a major driver of arterial thrombosis, leading to conditions such as myocardial infarction and stroke [4, 5]. Consequently, components of the platelet calcium signaling pathway are primary targets for antiplatelet drugs, including P2Y12 inhibitors and PAR1 antagonists, which aim to prevent pathological thrombus formation while minimizing bleeding risks [5, 6].

Other names

Platelet Ca2+ signalingPlatelet calcium homeostasisPlatelet calcium mobilization

Inhibition of platelet activation and aggregation by modulating intracellular calcium levels through the blockade of surface receptors, inhibition of second messenger synthesis, or direct interference with calcium entry and release mechanisms.