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KMID : 0848120050300030091
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International Journal of Oral Biology
2005 Volume.30 No. 3 p.91 ~ p.98
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Effect of Gamma-Aminobutyric Acid on the Gustatory Nucleus Tractus Solitarius in Rats
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Kim Mi-Won
Park Ha-Ok
Pahng Mong-Sook
Park Sang-Won
Kim Sun-Hun
Jung Ji-Yeon
Jeong Yeon-Jin
Kim Won-Jae
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Abstract
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Gamma-aminobutyric acid (GABA) is known as an inhibitory neurotransmitter in the neurons of the central nervous system. However, its detailed action mechanisms in the rostral gustatory zone of the nucleus tractus solitarius (rNTS) have not been established. The present study was aimed to investigate the distribution, role and action mechanisms of GABA in rNTS. Membrane potentials were recorded by whole cell recordings in isolated brain slices of the rat medulla. Superfusion of GABA resulted in a concentration-dependent reduction in input resistance in the neurons in rNTS. The change in input resistance ws accompanied by response to a depolarizing pulse were diminished by GABA. Superfusion of the slices with either GABA A agonist, muscimol, GABA B agonist, baclofen or GABA C agonist, TACA, decreased input resistance and reduced the nerve activity in association with membrane hyperpolarization. It is suggested that inhibitory signals playa role in sensory processing by the rNTS, in that GABA actions occur through activation of GABA A, GABA B and GABA C receptor. These results suggest that GABA has an inhibitory effect on the rNTS through an activation of GABA A, GABA B and GABA C receptors and that the GABAergic inhibition probably plays an important role in sensory processing by the rNTS.
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KEYWORD
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GABA, gustatory nucleus tractus solitarius, sensory processing
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