| First Author | Valet C | Year | 2015 |
| Journal | Blood | Volume | 126 |
| Issue | 9 | Pages | 1128-37 |
| PubMed ID | 26109204 | Mgi Jnum | J:226344 |
| Mgi Id | MGI:5697113 | Doi | 10.1182/blood-2015-03-636670 |
| Citation | Valet C, et al. (2015) Essential role of class II PI3K-C2alpha in platelet membrane morphology. Blood 126(9):1128-37 |
| abstractText | The physiologic roles of the class II phosphoinositide 3-kinases (PI3Ks) and their contributions to phosphatidylinositol 3-monophosphate (PI3P) and PI(3,4)P2 production remain elusive. Here we report that mice heterozygous for a constitutively kinase-dead PI3K-C2alpha display aberrant platelet morphology with an elevated number of barbell-shaped proplatelets, a recently discovered intermediate stage in the final process of platelet production. Platelets with heterozygous PI3K-C2alpha inactivation have critical defects in alpha-granules and membrane structure that are associated with modifications in megakaryocytes. These platelets are more rigid and unable to form filopodia after stimulation. Heterozygous PI3K-C2alpha inactivation in platelets led to a significant reduction in the basal pool of PI3P and a mislocalization of several membrane skeleton proteins known to control the interactions between the plasma membrane and cytoskeleton. These alterations had repercussions on the performance of platelet responses with delay in the time of arterial occlusion in an in vivo model of thrombosis and defect in thrombus formation in an ex vivo blood flow system. These data uncover a key role for PI3K-C2alpha activity in the generation of a basal housekeeping PI3P pool and in the control of membrane remodeling, critical for megakaryocytopoiesis and normal platelet production and function. |
