| First Author | Devanathan V | Year | 2015 |
| Journal | Proc Natl Acad Sci U S A | Volume | 112 |
| Issue | 20 | Pages | 6491-6 |
| PubMed ID | 25944935 | Mgi Jnum | J:221651 |
| Mgi Id | MGI:5641277 | Doi | 10.1073/pnas.1505887112 |
| Citation | Devanathan V, et al. (2015) Platelet Gi protein Galphai2 is an essential mediator of thrombo-inflammatory organ damage in mice. Proc Natl Acad Sci U S A 112(20):6491-6 |
| abstractText | Platelets are crucial for hemostasis and thrombosis and exacerbate tissue injury following ischemia and reperfusion. Important regulators of platelet function are G proteins controlled by seven transmembrane receptors. The Gi protein Galphai2 mediates platelet activation in vitro, but its in vivo role in hemostasis, arterial thrombosis, and postischemic infarct progression remains to be determined. Here we show that mice lacking Galphai2 exhibit prolonged tail-bleeding times and markedly impaired thrombus formation and stability in different models of arterial thrombosis. We thus generated mice selectively lacking Galphai2 in megakaryocytes and platelets (Gnai2(fl/fl)/PF4-Cre mice) and found bleeding defects comparable to those in global Galphai2-deficient mice. To examine the impact of platelet Galphai2 in postischemic thrombo-inflammatory infarct progression, Gnai2(fl/fl)/PF4-Cre mice were subjected to experimental models of cerebral and myocardial ischemia/reperfusion injury. In the model of transient middle cerebral artery occlusion stroke Gnai2(fl/fl)/PF4-Cre mice developed significantly smaller brain infarcts and fewer neurological deficits than littermate controls. Following myocardial ischemia, Gnai2(fl/fl)/PF4-Cre mice showed dramatically reduced reperfusion injury which correlated with diminished formation of the ADP-dependent platelet neutrophil complex. In conclusion, our data provide definitive evidence that platelet Galphai2 not only controls hemostatic and thrombotic responses but also is critical for the development of ischemia/reperfusion injury in vivo. |
