Synaptic inhibition and cell communication; impairment of cell-to-cell coupling produced by gamma-aminobutyric acid (GABA) in the somatic musculature of Ascaris lumbricoides.
The influence of gamma-aminobutyric acid (GABA) (10(-5) M) on the electrical coupling of giant somatic muscle cells of Ascaris lumbricoides was investigated. GABA enhanced the resting potential of the cells and abolished the spike activity. The coupling coefficient (V2/V1) was reduced by 58.8% while the input resistance (Rin) was decreased by 38.8%. The decline in Rin was not related to unlinearity of the current-voltage relation. As the time constant of cell membrane was reduced by 28.4% by the addition of GABA the effect of the neurotransmitter on cell-to-cell coupling seems to be mainly related to a decrease in resistance of the non-junctional membrane due to an increase in chloride conductance.
D000200:Action Potentials; D000818:Animals; D001200:Ascaris / Q000033:anatomy & histology / Q000502:physiology*; D002450:Cell Communication; D004553:Electric Conductivity / Q000187:drug effects; D066298:In Vitro Techniques; D009132:Muscles / Q000294:innervation; D009433:Neural Inhibition; D013569:Synapses / Q000502:physiology*; D005680:gamma-Aminobutyric Acid / Q000502:physiology*
D005680:gamma-Aminobutyric Acid