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Tributyltin causes cytochrome C release from isolated mitochondria by two discrete mechanisms.

Abstract：

:Using isolated liver mitochondria we show that low concentrations of TBT (0.5 microM) cause the release of mitochondrial cytochrome c, in the presence of Ca(2+). This is reflected in a rapid loss of membrane potential (DeltaPsi(m)), and a large-amplitude swelling characteristic of mitochondrial permeability transition (MPT). Despite this, the inclusion of cyclosporin A could not prevent the release of cytochrome c. Further, in the absence of Ca(2+), low concentrations of TBT (0.5 microM) resulted in a slow sub-maximal shift of DeltaPsi(m), not characteristic of MPT, which was still paralleled by a release of cytochrome c. Further experiments showed that the loss of DeltaPsi(m) in the absence of Ca(2+) was due to a combination of inhibition of respiration and a direct uncoupling effect on the respiratory chain. Under these conditions, rapid swelling of mitochondria could be demonstrated, due to chloride exchange over the inner mitochondrial membrane. Taken together these data suggest that TBT can induce the release of cytochrome c in intact cells by at least two mechanisms. The first and critical mechanism is initiated immediately the mitochondria sense the presence of TBT and involves a slow loss of DeltaPsi(m) and induction of swelling, which allows release of cytochrome c in a relatively non-specific manner and independently from a rise in [Ca(2+)](i). The second mechanism involves the induction of formal MPT as intracellular [Ca(2+)](i) increases. These data help to explain previous observations in intact lymphocytes demonstrating TBT-induced release of mitochondrial cytochrome c in the absence of a rise in [Ca(2+)](i) (Stridh, H., Gigliotti, D., Orrenius, S., and Cotgreave, I. A. (1999) Biochem. Biophys. Res. Commun. 266, 460-465).

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Gogvadze V,Stridh H,Orrenius S,Cotgreave I

doi

10.1006/bbrc.2002.6679

subject

Has Abstract

pub_date

2002-04-12 00:00:00

pages

904-8

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006291X02966799

journal_volume

292

pub_type

杂志文章

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