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Research ArticleArticle

Chronic Ethanol Differentially Alters Susceptibility to Chemically Induced Convulsions in Withdrawal Seizure-Prone and -Resistant Mice

Deborah A. Finn and John C. Crabbe
Journal of Pharmacology and Experimental Therapeutics February 1999, 288 (2) 782-790;
Deborah A. Finn
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John C. Crabbe
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Abstract

Withdrawal seizure-prone (WSP) and withdrawal seizure-resistant (WSR) mice were selectively bred to have severe (WSP) or mild (WSR) handling-induced convulsions after chronic ethanol inhalation. The purpose of the present experiments was to determine whether seizure susceptibility differences between WSP and WSR mice during ethanol withdrawal were specific to agents acting at γ-aminobutyric acidA or excitatory amino acid (EAA) receptors. Male WSP and WSR mice were exposed to ethanol vapor or air for 24 or 72 h. During peak withdrawal (i.e., between 6.5 and 8 h after removal from the inhalation chambers), separate groups of animals were administered pentylenetetrazol, (+)bicuculline,N-methyl-d-aspartate, kainic acid, or strychnine via timed tail vein infusion. Withdrawal from ethanol significantly increased sensitivity to pentylenetetrazol and (+)bicuculline versus air-exposed WSP and WSR mice. In contrast, sensitivity to N-methyl-d-aspartate-induced convulsions was significantly decreased in the ethanol-exposed WSR and unchanged in the ethanol-exposed WSP mice. Sensitivity to kainic acid was significantly increased in both ethanol-exposed WSR and WSP mice, although the magnitude of change in sensitivity was greater in the ethanol-withdrawing WSP line. Interestingly, sensitivity to strychnine was decreased similarly in the ethanol-exposed WSP and WSR mice, compared with their respective air-exposed animals. These results suggest that chronic ethanol increased sensitivity to convulsants active at γ-aminobutyric acidA receptors similarly in WSP and WSR mice, but differentially changed sensitivity to convulsants active at EAA receptors in the lines. This supports a role for EAA systems in determining genetic susceptibility to alcohol withdrawal.

Footnotes

  • Send reprint requests to: Deborah A. Finn, Ph.D., Portland Alcohol Research Center, VAMC Research (R&D 12), 3710 SW U.S. Veterans Hospital Road, Portland, OR 97201. E-mail:finnd{at}ohsu.edu

  • ↵1 This work was supported by National Institute on Alcohol Abuse and Alcoholism Grants P50 AA10760 and R01 AA08261 and a Merit Review Grant from the Department of Veterans Affairs.

  • Abbreviations:
    WSP
    withdrawal seizure-prone
    WSR
    withdrawal seizure-resistant
    HIC
    handling-induced convulsion
    NMDA
    N-methyl-d-aspartate
    PTZ
    pentylenetetrazol
    GABAA
    γ-aminobutyric acidA
    EAA
    excitatory amino acid
    THE
    tonic hindlimb extension
    BEC
    blood ethanol concentration
    MC
    myoclonic
    FF
    face and forelimb
    RB
    running bouncing
    • Received June 10, 1998.
    • Accepted September 14, 1998.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 288 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 288, Issue 2
1 Feb 1999
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Research ArticleArticle

Chronic Ethanol Differentially Alters Susceptibility to Chemically Induced Convulsions in Withdrawal Seizure-Prone and -Resistant Mice

Deborah A. Finn and John C. Crabbe
Journal of Pharmacology and Experimental Therapeutics February 1, 1999, 288 (2) 782-790;

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Research ArticleArticle

Chronic Ethanol Differentially Alters Susceptibility to Chemically Induced Convulsions in Withdrawal Seizure-Prone and -Resistant Mice

Deborah A. Finn and John C. Crabbe
Journal of Pharmacology and Experimental Therapeutics February 1, 1999, 288 (2) 782-790;
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