Bcl-2 prevents loss of mitochondria in CCCP-induced apoptosis.

Abstract:

:Bcl-2 family proteins regulate apoptosis at the level of mitochondria. To examine the mechanism of Bcl-2 function, we investigated the effects of the protonophore carbonyl cyanide m-chlorophenyl hydrazone (CCCP) on two hematopoietic cell lines and Bcl-2 overexpressing transfectants. CCCP directly interferes with mitochondrial function and induces apoptosis. We show that Bcl-2 inhibits apoptosis and that the antiapoptotic effect of Bcl-2 takes place upstream of caspase activation and nuclear changes associated with apoptosis, since these were markedly inhibited in cells overexpressing Bcl-2. Bcl-2 does not prevent the decrease in mitochondrial membrane potential nor the alterations in cellular ATP content induced by CCCP in FL5.12 and Jurkat cells. A higher number of mitochondria was observed in untreated Bcl-2 transfected cells compared to parental cells, as shown by electron microscopy. Exposure to CCCP induced a dramatic decrease in the number of mitochondria and severely disrupted mitochondrial ultrastructure, with apparent swelling and loss of cristae in parental cells. Bcl-2 clearly diminished the disruption of mitochondrial structure and preserved a higher number of mitochondria. These data suggest that CCCP induces apoptosis by structural disruption of mitochondria and that Bcl-2 prevents apoptosis and mitochondrial degeneration by preserving mitochondrial integrity.

journal_name

Exp Cell Res

authors

de Graaf AO,van den Heuvel LP,Dijkman HB,de Abreu RA,Birkenkamp KU,de Witte T,van der Reijden BA,Smeitink JA,Jansen JH

doi

10.1016/j.yexcr.2004.06.024

keywords:

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

533-40

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(04)00371-4

journal_volume

299

pub_type

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