Abstract
Hemopoietic cells express relatively high levels of the type I phosphoinositide (PI) 3-kinase isoforms, with p110δ and γ exhibiting specialized signaling functions in neutrophils, monocytes, mast cells, and lymphocytes. In platelets, p110β appears to be the dominant PI 3-kinase isoform regulating platelet activation, irrespective of the nature of the primary platelet activating stimulus. Based on findings with isoform-selective p110β pharmacological inhibitors and more recently with p110β–deficient platelets, p110β appears to primarily signal downstream of Gi- and tyrosine kinase-coupled receptors. Functionally, inhibition of p110β kinase function leads to a marked defect in integrin αIIbβ3 adhesion and reduced platelet thrombus formation in vivo. This defect in platelet adhesive function is not associated with increased bleeding, suggesting that therapeutic targeting of p110β may represent a safe approach to reduce thrombotic complications in patients with cardiovascular disease.
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- 3-PPIs:
-
3-Phosphorylated phosphoinositides
- ADP:
-
Adenosine diphosphate
- CalDAG-GEF1:
-
Calcium and DAG-dependent guanine nucleotide exchange factor
- DAG:
-
Diacylglycerol
- fMLP:
-
formyl-Met-Leu-Phe
- GP:
-
Glycoprotein
- GPCR:
-
G-protein coupled receptor
- IP3:
-
Inositol (1,4,5)-triphosphate
- ITAM:
-
Immunoreceptor tyrosine-based activation motif
- PAR:
-
Protease-activated receptor
- PH:
-
Pleckstrin homology
- PI:
-
Phosphoinositide
- PI(3,4)P2 :
-
Phosphoinositide (3,4)-biphosphate
- PI(3,4,5)P3 :
-
Phosphoinositide (3,4,5)-triphosphate
- PKC:
-
Protein kinase C
- PLC:
-
Phospholipase C
- RIAM:
-
Rap1-GTP interacting adapter molecule
- TXA2:
-
Thromboxane A2
- VWF:
-
von Willebrand factor
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Jackson, S.P., Schoenwaelder, S.M. (2010). PI 3-Kinase p110β Regulation of Platelet Integrin αIIbβ3 . In: Rommel, C., Vanhaesebroeck, B., Vogt, P. (eds) Phosphoinositide 3-kinase in Health and Disease. Current Topics in Microbiology and Immunology, vol 346. Springer, Berlin, Heidelberg. https://doi.org/10.1007/82_2010_61
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