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Difluoromethylornithine Decreases Long‐Lasting Protein Oxidation Induced by Neonatal Ethanol Exposure in the Hippocampus of Adolescent Rats
Author(s) -
Mello Carlos Fernando,
Rubin Maribel Antonello,
Sultana Rukhsana,
Barron Susan,
Littleton John Martin,
Butterfield D. Allan
Publication year - 2007
Publication title -
alcoholism: clinical and experimental research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.267
H-Index - 153
eISSN - 1530-0277
pISSN - 0145-6008
DOI - 10.1111/j.1530-0277.2007.00369.x
Subject(s) - hippocampus , oxidative stress , medicine , chemistry , striatum , endocrinology , ethanol , cerebellum , oxidative phosphorylation , cerebral cortex , nitrotyrosine , biochemistry , dopamine , biology , enzyme , nitric oxide synthase
Background: Ethanol exposure and withdrawal during central nervous system development can cause oxidative stress and produce severe and long‐lasting behavioral and morphological alterations in which polyamines seem to play an important role. However, it is not known if early ethanol exposure causes long‐lasting protein oxidative damage and if polyamines play a role in such a deleterious effect of ethanol. Methods: In this study we investigated the effects of early ethanol exposure (6 g/kg/d, by gavage), from postnatal day (PND) 1 to 8, and of the administration of difluoromethylornithine (DFMO, 500 mg/kg, i.p., on PND 8), a polyamine biosynthesis inhibitor, on the extent of oxidative modification of proteins. Indices of oxidative modification of proteins included protein carbonyls, 3‐nitrotyrosine (3‐NT), and protein bound 4‐hydroxynonenal (HNE) in the hippocampus, cerebellum, hypothalamus, striatum, and cerebral cortex of Sprague–Dawley rats at PND 40. Results: Both ethanol and DFMO administration alone increased protein carbonyl immunoreactivity in the hippocampus at PND 40, but the combination of DFMO and ethanol resulted in no effect on protein carbonyl levels. No alterations in the content of protein‐bound HNE, 3‐NT, or carbonyl were found in any other cerebral structure. Conclusions: These results suggest that the hippocampus is selectively affected by early ethanol exposure and by polyamine synthesis inhibition. In addition, the results suggest a role for polyamines in the long‐lasting increase of protein carbonyls induced by ethanol exposure and withdrawal.