Thromboxane A2 receptor (TP receptor) (TP receptor)

The Thromboxane A2 receptor (TP receptor) is a G protein-coupled receptor that serves as the primary mediator for thromboxane A2 (TXA2), a potent prostanoid derived from arachidonic acid (UniProt P21708). It is predominantly expressed in platelets and vascular smooth muscle cells, where its activation triggers signaling cascades involving Gq and G12/13 proteins (PubMed 21816791). These signaling pathways lead to increased intracellular calcium, resulting in rapid platelet aggregation and potent vasoconstriction (StatPearls: Thromboxane A2). Beyond its role in acute hemostasis, the TP receptor is involved in chronic inflammatory processes and the progression of atherosclerosis, hypertension, and asthma (NCBI Gene: TBXA2R). Pharmacological targeting of this receptor includes the use of specific antagonists like terutroban and ifetroban, which block the receptor's activity directly (PubMed 21816791). Additionally, the pathway is indirectly modulated by aspirin, which inhibits the COX-1 enzyme to prevent the synthesis of the TXA2 ligand (StatPearls: Thromboxane A2). These therapeutic strategies aim to prevent thrombotic events such as myocardial infarction and stroke by dampening hyper-reactive platelet responses. Clinical interest in TP receptor antagonists stems from their potential to provide antiplatelet benefits with a potentially more favorable safety profile regarding bleeding compared to other anticoagulants.

Other names

TBXA2RTXA2 receptorProstanoid TP receptorThromboxane prostanoid receptorBDPLT13TXA2-R

TP receptor antagonism; Thromboxane synthase inhibition; COX-1 inhibition (indirect)