Presynaptic muscarinic inhibition in bullfrog sympathetic ganglia.
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چکیده
منابع مشابه
Modulatory effect of ATP on the release of acetylcholine from presynaptic nerve terminals in bullfrog sympathetic ganglia.
The effect of adenosine triphosphate (ATP) on the release of acetylcholine (ACh) from presynaptic nerve terminals was investigated in bullfrog sympathetic ganglia. ATP decreased the amplitude and quantal content of fast excitatory postsynaptic potentials (fast e.p.s.p.s) calculated from the variance of fast e.p.s.p. amplitude in a low Ca2+-high Mg2+ Ringer solution. The frequency of miniature e...
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A mechanism of the long-term potentiation of transmitter release induced by adrenaline (ALTP) was studied by recording intracellularly the fast excitatory postsynaptic potentials (fast EPSPs). The ALTP was produced during the blockade of K+ channels at the presynaptic terminals by tetraethylammonium (TEA). The synaptic delay, possibly reflecting a relative change in the duration of an action po...
متن کاملContinuous repetitive stimuli are more effective than bursts for evoking LHRH release in bullfrog sympathetic ganglia.
Effects of different patterns of presynaptic stimulation upon release of leuteinizing hormone releasing hormone (LHRH) were studied by monitoring LHRH-induced slow currents from individual postsynaptic neurons in bullfrog sympathetic ganglia. LHRH-mediated synaptic currents in ganglionic B and C neurons were recorded by a single-electrode voltage-clamp technique. Using continuous stimulation, r...
متن کاملNeuropeptide Y-like immunoreactivity in bullfrog sympathetic ganglia is restricted to C cells.
Staining the entire chain of paravertebral sympathetic ganglia in the bullfrog with an antiserum against porcine neuropeptide Y (NPY) revealed that, in each ganglion, a subpopulation of neurons expresses NPY-like immunoreactivity. Chromaffin cells in the sympathetic ganglia and in the adrenal gland were not stained by the anti-NPY serum. Since neurons in ganglia 9 and 10 of the sympathetic chai...
متن کاملRelease of LHRH is linearly related to the time integral of presynaptic Ca2+ elevation above a threshold level in bullfrog sympathetic ganglia.
To study the Ca2+ dependency of luteinizing hormone-releasing hormone (LHRH) release in the bullfrog sympathetic ganglia, a method was developed to fill the preganglionic nerve terminal boutons with membrane-impermeant fura-2. We found that as stimulation frequency increased from 0.5 to 40 Hz, the peak [Ca2+]i ([Ca2+]p) and the rate of rise in [Ca2+]i increased, the decay of [Ca2+]i transients ...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1996
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1996.sp021225