In contrast, hHAP2Y2R-elicited changes in viability and apoptotic (caspase-9) activity were decreased after mechanical injury in Cav-1 KD 1321N1 cells expressing hHAP2Y2R. These findings support the importance of Cav-1 in modulating P2Y2R signaling during mechanical injury and its protective actions in a human astrocytoma cell line, whilst shedding light on potential new venues for brain injury or trauma interventions. This evidence concerns the gene CASP9 and astrocytoma (excluding glioblastoma).