Gliotoxin induces Mg2+ efflux from intact brain mitochondria.

Abstract:

:Gliotoxin (GT) is a hydrophobic fungal metabolite of the epipolythiodioxopiperazine group which reacts with membrane thiols. When added to a suspension of energized brain mitochondria, it induces matrix swelling of low amplitude, collapse of membrane potential (DeltaPsi), and efflux of endogenous cations such as Ca2+ and Mg2+, typical events of mitochondrial permeability transition (MPT) induction. These effects are due to opening of the membrane transition pore. The addition of cyclosporin A (CsA) or ADP slightly reduces membrane potential collapse, matrix swelling and Ca2+ efflux; Mg2+ efflux is not affected at all. The presence of exogenous Mg2+ or spermine completely preserve mitochondria against DeltaPsi collapse, matrix swelling and Ca2+ release. Instead, Mg2+ efflux is only slightly affected by spermine. Our results demonstrate that, besides inducing MPT, gliotoxin activates a specific Mg2+ efflux system from brain mitochondria.

journal_name

Neurochem Int

authors

Salvi M,Bozac A,Toninello A

doi

10.1016/j.neuint.2004.01.001

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

759-64

issue

5

eissn

0197-0186

issn

1872-9754

pii

S0197018604000142

journal_volume

45

pub_type

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