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- W2085163014 abstract "We have investigated the effects of bilateral electrical stimulation of the vagus nerves in anesthetized, paralyzed rats on the release of exogenously administered [3H]L-glutamic acid ([3H]L-Glu) or [3H]D-aspartic acid ([3H]D-Asp) from the intermediate portion of the nucleus tractus solitarius (NTS). Electrical stimulation of afferent fibers with the frequency, pulse, duration, and intensity required to activate C-fibers, elicited hypotension and bradycardia. Such stimuli induced the release of [3H]L-Glu, or its stable analogue [3H]D-Asp, from the NTS into perfusate collected through push-pull cannulae. The release of radioactive materials, calculated as a percent of increase in radioactivity above the prestimulation level, was for [3H]L-Glu 114.4 +/- 25.1% (n = 20) during bilateral vagal stimulation, and 45.6 +/- 11.3% (n = 9) (P less than 0.001) during unilateral stimulation. The release of [3H]D-Asp induced by bilateral vagal stimulation was 100.4 +/- 31.9%. The release, which was anatomically specific and restricted to the NTS, was directly related to stimulus (and hence reflex) intensity. Overflow of the inert substances [14C]urea OR [14C]sucrose, co-administered with the [3H] amino acids, did not increase at the same time. Local depolarization of the cells in the NTS by K+ (53mM) increased the overflow of [3H]L-Glu, as well as [14C]urea, and was able to induce the release of [3H]L-Glu when electrical stimulation failed to have an effect. The results are consistent with the hypothesis that L-Glu is a neurotransmitter of neurons in the NTS mediating vasodepressor response from vagal afferents, including those from systemic baroreceptors." @default.
- W2085163014 created "2016-06-24" @default.
- W2085163014 creator A5045326915 @default.
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- W2085163014 date "1983-01-01" @default.
- W2085163014 modified "2023-09-26" @default.
- W2085163014 title "Release of [3H]l-glutamine acid (l-Glu) and [3H]d-aspartic acid (d-Asp) in the area of nucleus tractus solitarius in vivo produced by stimulation of the vagus nerve" @default.
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- W2085163014 doi "https://doi.org/10.1016/0006-8993(83)91068-5" @default.
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