Glycoprotein IIb/IIIa

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integrin, alpha 2b (platelet glycoprotein IIb of IIb/IIIa complex, antigen CD41)
Symbol ITGA2B
Alt. symbols GP2B
Entrez 3674
HUGO 6138
OMIM 607759
RefSeq NM_000419
UniProt P08514
Other data
Locus Chr. 17 q21.32
integrin, beta 3 (platelet glycoprotein IIIa, antigen CD61)
Symbol ITGB3
Alt. symbols GP3A
Entrez 3690
HUGO 6156
OMIM 173470
RefSeq NM_000212
UniProt P05106
Other data
Locus Chr. 17 q21.32

In medicine, glycoprotein IIb/IIIa (GPIIb/IIIa, also known as integrin αIIbβ3) is an integrin complex found on platelets. It is a receptor for fibrinogen[1] and von Willebrand factor and aids in platelet activation. The complex is formed via calcium-dependent association of gpIIb and gpIIIa, a required step in normal platelet aggregation and endothelial adherence.[2][3] Platelet activation by ADP (blocked by clopidogrel) leads to a conformational change in platelet gpIIb/IIIa receptors that induces binding to fibrinogen.[1] The gpIIb/IIIa receptor is a target of several drugs including abciximab, eptifibatide, tirofiban.


Defects in glycoprotein IIb/IIIa cause Glanzmann's thrombasthenia.[4]

Autoantibodies against IIb/IIIa can be produced in immune thrombocytopenic purpura.[5]


Glycoprotein IIb/IIIa inhibitors can be used to prevent blood clots in an effort to decrease the risk of heart attack or stroke.

See also[edit]


  1. ^ a b Vickers JD (July 1999). "Binding of polymerizing fibrin to integrin alpha(IIb)beta(3) on chymotrypsin-treated rabbit platelets decreases phosphatidylinositol 4,5-bisphosphate and increases cytoskeletal actin". Platelets 10 (4): 228–37. doi:10.1080/09537109976077. PMID 16801097. 
  2. ^ Calvete JJ (1995). "On the structure and function of platelet integrin alpha IIb beta 3, the fibrinogen receptor". Proc. Soc. Exp. Biol. Med. 208 (4): 346–60. PMID 7535429. 
  3. ^ Shattil SJ (1999). "Signaling through platelet integrin alpha IIb beta 3: inside-out, outside-in, and sideways". Thromb. Haemost. 82 (2): 318–25. PMID 10605720. 
  4. ^ Bellucci S, Caen J (2002). "Molecular basis of Glanzmann's Thrombasthenia and current strategies in treatment". Blood Rev. 16 (3): 193–202. doi:10.1016/S0268-960X(02)00030-9. PMID 12163005. 
  5. ^ McMillan R (October 2007). "The pathogenesis of chronic immune thrombocytopenic purpura". Semin. Hematol. 44 (4 Suppl 5): S3–S11. doi:10.1053/j.seminhematol.2007.11.002. PMID 18096470. 

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