PERSONAL DE APOYO
FANELLI Silvia Laura
congresos y reuniones científicas
Título:
Oxidation of alcohol to acetaldehyde, hydroxil radical formation, and oxidative stress in the rat uterus. Their reaction to reproductive toxicity
Autor/es:
G CASTRO, L BUTHET, S FANELLI, C RODRIGUEZ DE CASTRO, M COSTANTINI, F BIETTO, J CASTRO
Lugar:
Barcelona
Reunión:
Congreso; XII International Congress of Toxicology (IUTOX); 2010
Institución organizadora:
AETOX (Spanish Association of Toxicology) with the collaboration of EUROTOX
Resumen:
P208-005
Oxidation of alcohol to acetaldehyde, hydroxyl radical
formation, and oxidative stress in the rat uterus. Their relation
to reproductive toxicity
G. Castro, L. Buthet, S. Fanelli, C. Rodriguez De Castro, M.
Costantini, F. Bietto, J. Castro
CITEFA-CONICET, Argentina
It is known that alcohol drinking can lead to impairment in reproductive
function in women. In this study we analyze the possibility
that at least part of these effects were mediated through alterations
of uterus function related to ethanol oxidation to acetaldehyde
occurring in that tissue. We found that biotransformation in the
cytosolic fraction is mediated by xanthine oxidoreductase (XOR),
required a purine cosubstrate and was inhibited by allopurinol
and pyrazol. By histochemistry XOR activity was detected in the
epithelium and aldehyde dehydrogenase activity was detected in
the muscular layer and the serosa. The microsomal process did not
require NADPH but was of enzymatic nature, sensitive to oxygen
and was inhibited by diethyldithiocarbamate, diphenyleneiodonium
and partially by esculetin and nordihydroguaiaretic acid.
Both, cytosolic and microsomal fractions from uterus showed
the ability to generate hydroxyl radicals in the presence of alcohol,
as detected by GC-MS of adducts formed with the spin trap PBN.
Ultrastructure of uterus from rats treated with standard Lieber &
De Carli liquid diet for 28 days revealed extensive vacuolization
in cytoplasm and loss of cell content. In addition we observed the
promotion of oxidative stress as evidenced by increased response
in the t-butylhydroperoxide induced chemiluminiscence and the
depletion of the protein sulfhydryl content. Results suggest that in
the rat uterus, metabolism of ethanol to acetaldehyde may play a
role in alcohol effects on female reproductive function.
Acknowledgements: Supported by ANPCyT (PICT 2004 25354)
and CONICET (PIP 5158).
doi:10.1016/j.toxlet.2010.03.771