Role of the GABA-A system in estrogen-induced protection against brain lipid peroxidation in ethanol-withdrawn rats

Mridula Rewal, Eunsun Jung, James W. Simpkins

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Background: Our previous study showed that 17 β-estradiol (E2) treatment protects against cerebellar neuronal death and related motor deficits in ethanol-withdrawn rats, in part through the GABAergic system. In this study, we examined the effect of the GABA-A antagonist bicuculline on the neuroprotective effect of E2 by assessing the oxidative marker thiobarbituric acid reactive substances (TBARS) during ethanol withdrawal (EW). Methods: Ovariectomized animals that had implants of E2 (EW/E2) or oil (EW/Oil) pellets received liquid ethanol (7.5% w/v) or dextrin for 7 days by gavage. The GABA-A antagonist bicuculline (1.25 mg/kg) was administered (three times a day intraperitoneally) for 4 days starting 3 days before the onset of EW. After testing for overt EW signs at 7 hr of EW, one set of the animals was immediately killed for the collection of the cerebellum, hippocampus, and cortex. The brain homogenates were further processed for TBARS assay to detect TBARS in the presence or absence of FeCl3. For assessing motor capacity, the other set of animals was tested for the latency to fall from a rotarod after 1 week of EW. Results: The EW/Oil animals had enhanced endogenous and FeCl 3-stimulated TBARS levels in the cerebellum and the hippocampus in a manner potentiated by bicuculline but inhibited by E2. Bicuculline counteracted the protective effect of E2 when administered along with E2. Pearson correlation coefficients indicated that the latency to fall from the rotarod covaried with TBARS levels in the cerebellum and the hippocampus. Conclusion: These data suggest that E2 protects against lipid peroxidation in vulnerable brain areas of ethanol-withdrawn rats, in part through the GABAergic system.

Original languageEnglish
Pages (from-to)1907-1915
Number of pages9
JournalAlcoholism: Clinical and Experimental Research
Volume28
Issue number12
DOIs
StatePublished - 1 Dec 2004

Fingerprint

gamma-Aminobutyric Acid
Lipid Peroxidation
Rats
Brain
Estrogens
Ethanol
Lipids
Thiobarbituric Acid Reactive Substances
Bicuculline
Animals
Cerebellum
GABA-A Receptor Antagonists
Hippocampus
Oils
Neuroprotective Agents
Estradiol
Assays
Liquids
Testing

Keywords

  • 17 β-Estradiol
  • Ethanol Withdrawal
  • GABA-A system
  • TBARS

Cite this

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title = "Role of the GABA-A system in estrogen-induced protection against brain lipid peroxidation in ethanol-withdrawn rats",
abstract = "Background: Our previous study showed that 17 β-estradiol (E2) treatment protects against cerebellar neuronal death and related motor deficits in ethanol-withdrawn rats, in part through the GABAergic system. In this study, we examined the effect of the GABA-A antagonist bicuculline on the neuroprotective effect of E2 by assessing the oxidative marker thiobarbituric acid reactive substances (TBARS) during ethanol withdrawal (EW). Methods: Ovariectomized animals that had implants of E2 (EW/E2) or oil (EW/Oil) pellets received liquid ethanol (7.5{\%} w/v) or dextrin for 7 days by gavage. The GABA-A antagonist bicuculline (1.25 mg/kg) was administered (three times a day intraperitoneally) for 4 days starting 3 days before the onset of EW. After testing for overt EW signs at 7 hr of EW, one set of the animals was immediately killed for the collection of the cerebellum, hippocampus, and cortex. The brain homogenates were further processed for TBARS assay to detect TBARS in the presence or absence of FeCl3. For assessing motor capacity, the other set of animals was tested for the latency to fall from a rotarod after 1 week of EW. Results: The EW/Oil animals had enhanced endogenous and FeCl 3-stimulated TBARS levels in the cerebellum and the hippocampus in a manner potentiated by bicuculline but inhibited by E2. Bicuculline counteracted the protective effect of E2 when administered along with E2. Pearson correlation coefficients indicated that the latency to fall from the rotarod covaried with TBARS levels in the cerebellum and the hippocampus. Conclusion: These data suggest that E2 protects against lipid peroxidation in vulnerable brain areas of ethanol-withdrawn rats, in part through the GABAergic system.",
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Role of the GABA-A system in estrogen-induced protection against brain lipid peroxidation in ethanol-withdrawn rats. / Rewal, Mridula; Jung, Eunsun; Simpkins, James W.

In: Alcoholism: Clinical and Experimental Research, Vol. 28, No. 12, 01.12.2004, p. 1907-1915.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Role of the GABA-A system in estrogen-induced protection against brain lipid peroxidation in ethanol-withdrawn rats

AU - Rewal, Mridula

AU - Jung, Eunsun

AU - Simpkins, James W.

PY - 2004/12/1

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N2 - Background: Our previous study showed that 17 β-estradiol (E2) treatment protects against cerebellar neuronal death and related motor deficits in ethanol-withdrawn rats, in part through the GABAergic system. In this study, we examined the effect of the GABA-A antagonist bicuculline on the neuroprotective effect of E2 by assessing the oxidative marker thiobarbituric acid reactive substances (TBARS) during ethanol withdrawal (EW). Methods: Ovariectomized animals that had implants of E2 (EW/E2) or oil (EW/Oil) pellets received liquid ethanol (7.5% w/v) or dextrin for 7 days by gavage. The GABA-A antagonist bicuculline (1.25 mg/kg) was administered (three times a day intraperitoneally) for 4 days starting 3 days before the onset of EW. After testing for overt EW signs at 7 hr of EW, one set of the animals was immediately killed for the collection of the cerebellum, hippocampus, and cortex. The brain homogenates were further processed for TBARS assay to detect TBARS in the presence or absence of FeCl3. For assessing motor capacity, the other set of animals was tested for the latency to fall from a rotarod after 1 week of EW. Results: The EW/Oil animals had enhanced endogenous and FeCl 3-stimulated TBARS levels in the cerebellum and the hippocampus in a manner potentiated by bicuculline but inhibited by E2. Bicuculline counteracted the protective effect of E2 when administered along with E2. Pearson correlation coefficients indicated that the latency to fall from the rotarod covaried with TBARS levels in the cerebellum and the hippocampus. Conclusion: These data suggest that E2 protects against lipid peroxidation in vulnerable brain areas of ethanol-withdrawn rats, in part through the GABAergic system.

AB - Background: Our previous study showed that 17 β-estradiol (E2) treatment protects against cerebellar neuronal death and related motor deficits in ethanol-withdrawn rats, in part through the GABAergic system. In this study, we examined the effect of the GABA-A antagonist bicuculline on the neuroprotective effect of E2 by assessing the oxidative marker thiobarbituric acid reactive substances (TBARS) during ethanol withdrawal (EW). Methods: Ovariectomized animals that had implants of E2 (EW/E2) or oil (EW/Oil) pellets received liquid ethanol (7.5% w/v) or dextrin for 7 days by gavage. The GABA-A antagonist bicuculline (1.25 mg/kg) was administered (three times a day intraperitoneally) for 4 days starting 3 days before the onset of EW. After testing for overt EW signs at 7 hr of EW, one set of the animals was immediately killed for the collection of the cerebellum, hippocampus, and cortex. The brain homogenates were further processed for TBARS assay to detect TBARS in the presence or absence of FeCl3. For assessing motor capacity, the other set of animals was tested for the latency to fall from a rotarod after 1 week of EW. Results: The EW/Oil animals had enhanced endogenous and FeCl 3-stimulated TBARS levels in the cerebellum and the hippocampus in a manner potentiated by bicuculline but inhibited by E2. Bicuculline counteracted the protective effect of E2 when administered along with E2. Pearson correlation coefficients indicated that the latency to fall from the rotarod covaried with TBARS levels in the cerebellum and the hippocampus. Conclusion: These data suggest that E2 protects against lipid peroxidation in vulnerable brain areas of ethanol-withdrawn rats, in part through the GABAergic system.

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