Bradykinin activates phospholipase D2 via protein kinase C delta in PC12 cells

Bradykinin (BK) activates phospholipase D (PLD) and induces several respons es such as catecholamine secretion, collapse of growth cones, and gene expr ession in PC12 pheochromocytoma cells. Although two distinct PLD isozymes, PLD1 and PLD2, have been cloned from mammalian cells, the regulatory mechan ism for each PLD isozyme by BK is not clear, In our present study, we inves tigated the activation mechanism of PLD2 by BK in PLD2-overexpressing PC12 cells. BK stimulated PLD2 activity in a concentration-dependent manner with in 1 min and this activation was inhibited by pretreatment of the cells wit h protein kinase C (PKC) inhibitor. PKC alpha and PKC delta translocated fr om cytosol to membrane upon BK treatment, and rottlerin potently inhibited the activation of PLD2 by BK. These results suggest that BK activates PLD2 via PKC delta in PC12 cells. (C) 2000 Published by Elsevier Science Ireland Ltd.