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Protein kinase cdelta and alpha are involved in the development of vasospasm after subarachnoid hemorrhage.

We have previously shown the enhanced activity of protein kinase C in the membrane fraction of the canine vasospastic artery after subarachnoid hemorrhage, which increased with progression of angiographic vasospasm. This study examined identification of protein kinase C isoforms in the canine basilar artery, and the changes in expression and/or translocation of each isoform during the development of vasospasm. Vasospasm was produced by using the "two-hemorrhage" canine model in the basilar artery, and angiographic progression of vasospasm was assessed consecutively. Two isoforms, protein kinase Calpha and delta were identified in basilar arteries by Western blotting. Densitometric analysis showed that the expression of protein kinase Cdelta in the membrane fraction was significantly increased in the earlier stage, and protein kinase Calpha was increased later as vasospasm progressed. These results indicate that protein kinase Cdelta and alpha isoforms may play a significant role in the development and maintenance of vasospasm.