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. 1989 Aug;97(4):1225–1231. doi: 10.1111/j.1476-5381.1989.tb12582.x

Modulation of non-adrenergic, non-cholinergic neural bronchoconstriction in guinea-pig airways via GABAB-receptors.

M G Belvisi 1, M Ichinose 1, P J Barnes 1
PMCID: PMC1854618  PMID: 2477104

Abstract

1. Evidence suggests that gamma-aminobutyric acid (GABA) and its receptors are present in the peripheral nervous system. We have now investigated the effect of GABA and related substances on non-adrenergic, non-cholinergic (NANC) neurally-evoked bronchoconstriction in the anaesthetised guinea-pig. 2. Bilateral vagal stimulation (5 V, 5 ms, 3 or 5 Hz) for 30 s, after propranolol (1 mg kg-1 i.v.) and atropine (1 mg kg-1 i.v.) evoked a NANC bronchoconstrictor response manifest as a mean tracheal pressure rise of 21.9 +/- 1.04 cmH2O (n = 70). The bronchoconstrictor response was reproducible for any given animal. 3. GABA (10 micrograms-10 mg kg-1 i.v.) did not alter basal tracheal pressure but reduced the NANC bronchoconstrictor response to vagal stimulation in a dose-dependent manner (ED50 = 186 micrograms kg-1 with a maximal inhibition of 74 +/- 3.4% at 10 mg kg-1). Neither the opioid antagonist naloxone (1 mg kg-1 i.v.) nor the alpha-adrenoceptor antagonist phentolamine (2.5 mg kg-1 i.v.) had any significant effect on the inhibitory response produced by GABA (500 micrograms kg-1). 4. GABA-induced inhibition was not antagonised by the GABAA-antagonist bicuculline (2 mg kg-1 i.v.). 5. The GABAB-agonist baclofen (10 micrograms-3 mg kg-1 i.v.) caused a dose-dependent inhibition of the NANC response (ED50 = 100 micrograms kg-1 with a maximal inhibition of 35.5 +/- 2.8% at 3 mg kg-1). The GABAA-agonist, 4,5,6,7-tetrahydroisoxazolo[5,4-C] pyridin-3-ol (THIP), also inhibited the NANC bronchoconstrictor response.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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