Ticlopidine Pathway


Ticlopidine is a platelet aggregation inhibitor structurally and pharmacologically similar to clopidogrel. The active metabolite of ticlopidine prevents binding of adenosine diphosphate (ADP) to its platelet receptor, impairing the ADP-mediated activation of the glycoprotein GPIIb/IIIa complex. It is proposed that the inhibition involves a defect in the mobilization from the storage sites of the platelet granules to the outer membrane. No direct interference occurs with the GPIIb/IIIa receptor. As the glycoprotein GPIIb/IIIa complex is the major receptor for fibrinogen, its impaired activation prevents fibrinogen binding to platelets and inhibits platelet aggregation. By blocking the amplification of platelet activation by released ADP, platelet aggregation induced by agonists other than ADP is also inhibited by the active metabolite of ticlopidine.

Pathway legend Zoom in

Pathway Image

Pathway legend Zoom in

References

  1. Jennings, L.K., & Saucedo, J.F. (2008). Antiplatelet and anticoagulant agents: key differences in mechanisms of action, clinical application, and therapeutic benefit in patients with non-ST-segment-elevation acute coronary syndromes. Current Opinion in Cardiology, 23(4), 302-308. PMID: 18520712
  2. Saltiel, E., & Ward, A. (1987). Ticlopidine. A review of its pharmacodynamic and pharmacokinetic properties, and therapeutic efficacy in platelet-dependent disease states. Drugs, 34(2), 222-262. PMID: 3304967