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• W1970915837 abstract "Background The mammalian gamma-aminobutyric acid type A (GABA(A)) receptor, a likely target of anesthetic action, exhibits remarkable subunit heterogeneity. In vitro expression studies suggest that there is subunit specificity to anesthetic responses at the GABA(A) receptor. The authors tested whether genetically engineered mice that lack the beta3 subunit of the GABA(A) receptor differed in their sensitivities to several general anesthetic agents. Methods Median effective concentrations for loss-of-righting reflex and tail clamp/withdrawal for enflurane and halothane were determined in mice with and without the beta3 gene and gene product. Sleep time was measured after intraperitoneal injection of pentobarbital, ethanol, etomidate, and midazolam. Results Null allele mice (beta3 -/-) did not differ from wild-type mice (beta3 +/+) in the obtunding response to enflurane and halothane but were significantly more resistant to enflurane (null allele half-effect concentrations [EC50] of 2.59 +/- 0.10 vs. wild-type EC50 of 2.06 +/- 0.12 atm %, P &lt; 0.001) and halothane (null allele EC50 of 1.73 +/- 0.04 vs. wild-type EC50 of 1.59 +/- 0.05 atm %, P = 0.01) as determined by tail clamp response. Wild-type and null allele mice exhibited divergent responses to other sedative agents active at the GABA(A) receptor. No differences were noted in sleep times after administration of pentobarbital and ethanol, but null allele mice were more resistant to etomidate (null allele EC50 of 17.8 +/- 1.9 min vs. wild-type EC50 of 26.2 +/- 2.4 min, P &lt; 0.02) and midazolam (null allele EC50 of 14.2 +/- 7.8 min vs. wild-type EC50 of 41.3 +/- 10.4 min, P &lt; 0.05). Conclusions The beta3 subunit of the GABA(A) receptor appears to be important in the mediation of the immobilizing (tail clamp) but not obtunding (loss-of-righting reflex) effects of the volatile anesthetic agents enflurane and halothane. These data support the hypotheses that separate components of the anesthetic state are mediated via different central nervous system loci; that the GABA(A) receptor is a likely target for the immobilizing response to volatile anesthetic agents; and that the beta3 subunit plays a direct or indirect role in the mediation of this response. Absence of the beta3 subunit appears to attenuate the obtunding effect of midazolam and etomidate but appears not to alter the obtunding effect of pentobarbital, enflurane, and halothane, suggesting that these anesthetic agents produce hypnosis by different specific molecular mechanisms." @default.
• W1970915837 created "2016-06-24" @default.
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• W1970915837 creator A5038922547 @default.
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• W1970915837 date "1998-03-01" @default.
• W1970915837 modified "2023-10-17" @default.
• W1970915837 title "Anesthesia Sensitivity in Mice that Lack the β3 Subunit of the γ-Aminobutyric Acid Type A Receptor " @default.
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• W1970915837 doi "https://doi.org/10.1097/00000542-199803000-00030" @default.
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