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Acetylcholinesterase (AChE) is emerging as an important component in leading to apoptosis. Our previous study demonstrated that silencing of theAChEgene blocked the interaction between cytochromecand apoptotic protease-activating factor-1 (Apaf-1) in etoposide-induced apoptosis of HT-29 cells. We undertook this study to further dissect the molecular role of AChE in apoptosome formation. The present study elicited that small interfering RNA (siRNA) tocytochrome cgene blocked the interaction of AChE with Apaf-1, whereas siRNA to Apaf-1 gene did not block the interaction of AChE with cytochromec, indicating that the interaction of AChE with cytochromecis required for the interaction between cytochromecand protease-activating factor-1. We further observed that AChE is localized to caveolae via interacting with caveolin-1 during apoptosis and that the disruption of caveolae prevented apoptosome formation. These data indicate that the interactions of AChE with caveolin-1 and subsequently with cytochromecappear to be indispensable for apoptosome formation.

carcinogenesis

Interactions of acetylcholinesterase with caveolin-1 and subsequently with cytochrome               c               are required for apoptosome formation