Glanzmann's thrombasthenia pathophysiology
|
Glanzmann's thrombasthenia |
|
Differentiating Glanzmann's thrombasthenia from other Diseases |
|---|
|
Diagnosis |
|
Treatment |
|
Case Studies |
|
Glanzmann's thrombasthenia pathophysiology On the Web |
|
American Roentgen Ray Society Images of Glanzmann's thrombasthenia pathophysiology |
|
Risk calculators and risk factors for Glanzmann's thrombasthenia pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
The GpIIb/IIIa is an adhesion receptor and is expressed in thrombocytes. This receptor is activated when the thrombocyte is stimulated by ADP, epinephrine, collagen and thrombin. The GpIIb/IIIa integrin is essential to the blood coagulation since it has the ability to bind fibrinogen, the von Willebrand factor, fibronectin and vitronectin. This enables the platelet to be activated by contact with the collagen-von Willebrand-complex that is exposed when the endothelial blood vessel lining is damaged and then aggregate with other thrombocytes via fibrinogen.
Patients suffering from Glanzmann's thrombasthenia thus have platelets less able to adhere to each other and to the underlying tissue of damaged blood vessels.
The understanding of its pathophysiology led to the development of GpIIb/IIIa inhibitors, a class of powerful antiplatelet agents.[1]
Pathophysiology
Integrin (ITG) αIIbβ3, formerly known as GPIIb/IIIa[2] is a large heterodimeric cell transmembrane receptor consists of a larger αIIb and a smaller β3 subunit. These subunits are non-covalently linked, allowing for duplex signaling between the cell membrane and extracellular matrix, while instituting intracellular signaling pathways.This heterodimer a 8×12 nm nodular head and two 18 nm stalks in electron microscope. [3]
References
- ↑ Seligsohn U. Glanzmann thrombasthenia: a model disease which paved the way to powerful therapeutic agents. Pathophysiol Haemost Thromb. 2002 Sep-Dec;32(5-6):216-7. PMID 13679645. Free Full Text.
- ↑ Nurden AT, Fiore M, Nurden P, Pillois X (2011). "Glanzmann thrombasthenia: a review of ITGA2B and ITGB3 defects with emphasis on variants, phenotypic variability, and mouse models". Blood. 118 (23): 5996–6005. doi:10.1182/blood-2011-07-365635. PMID 21917754.
- ↑ Solh T, Botsford A, Solh M (2015). "Glanzmann's thrombasthenia: pathogenesis, diagnosis, and current and emerging treatment options". J Blood Med. 6: 219–27. doi:10.2147/JBM.S71319. PMC 4501245. PMID 26185478.