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 Intjournal_title
Neurochemistry internationalauthors
Salvi M,Bozac A,Toninello Adoi
10.1016/j.neuint.2004.01.001subject
Has Abstractpub_date
2004-10-01 00:00:00pages
759-64issue
5eissn
0197-0186issn
1872-9754pii
S0197018604000142journal_volume
45pub_type
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