Participation of GABAergic Systems in the Production of Antinociception by Various Stresses in Mice
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概要
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Based on the data that diazepam, a benzodiazepine (BZP) receptor agonist, antagonized psychological (PSY)-stress induced analgesia (SIA) without prominent action on footshock (FS)- and forced swimming (SW)-SIA and that BZP receptors are coupled with GABA receptors, we examined how the GABAergic system participates in the production of various SIAs. Muscimol, a GABA<SUB>A</SUB> receptor agonist, at doses of 0.25 to 1.0 mg/kg, affected each SIA differently, suppressed PSY-SIA at 0.25 mg/kg but tended to potentiate it at 1.0 mg/kg, potentiated SW-SIA dose-dependently and did not affect FS-SIA at the doses employed. Both bicuculline, a GABA<SUB>A</SUB> receptor antagonist, 0.5 to 2.0 mg/kg, and picrotoxin, a Cl<SUP>-</SUP> channel blocker, 0.25 to 1.0 mg/kg, dose-dependently suppressed PSY-and FS-SIA. Meanwhile, the effects of both drugs on SW-SIA were less than those on PSY- and FS-SIA, namely, bicuculine slightly inhibited it only at 2.0 mg/kg, and picrotoxin did not produce any appreciable effect even at the highest dose. Baclofen, a GABA<SUB>B</SUB> receptor agonist, at 5.0 and 10.0 mg/kg had no influence on each SIA. On the contrary, CGP 35348, a GABA<SUB>B</SUB> receptor antagonist at 20 to 100 mg/kg caused the dose-dependent blockade of FS-SIA, but affected neither PSY- nor SW-SIA. The production of PSY- and SW-SIA is attributable to the GABA<SUB>A</SUB> receptors/Cl channel mediated mechanism alone, while that of FS-SIA involves both GABA<SUB>A</SUB> and GABA<SUB>B</SUB> receptor mediated systems. Thus, GABAergic systems play an important role in the production of each SIA; however, the participation of the receptor subtypes in the mechanism was different from each other.
著者
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Tokuyama Shogo
Department Of Clinical Pharmacy Kobe Gakuin University Faculty Of Pharmaceutical Sciences
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Kaneto Hiroshi
Department Of Pharmacology Faculty Of Pharmaceutical Science Nagasaki University
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Takahashi Masakatsu
Department of Analytical Research for Pharmacoinformatics, Graduate School of Pharmaceutical Sciences, Nagasaki University
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