P L Goldiner

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It is generally accepted that there is a functional antagonism between the sympathetic and parasympathetic (vagal) effects on the heart. In this study guinea-pig right atria loaded either with [3H]noradrenaline or [3H]choline were used and the release of [3H]noradrenaline or [3H]acetylcholine in response to field stimulation was measured under conditions(More)
Neurochemical evidence has been obtained that 4-aminopyridine, 3,4-diaminopyridine and 3,3-dimethyl-1-(4-amino-3-pyridyl)urea HBr (LF-14), concentration-dependently enhanced the stimulation-evoked release of [3H]norepinephrine ([3H]NE) from isolated guinea-pig atrium. The effects of aminopyridines, compounds known to inhibit potassium channels, were(More)
In order to extend the characterization of muscarinic receptors at presynaptic sites their inhibitory effect on the stimulation-evoked release of [3H]noradrenaline and [3H]acetylcholine from different axon terminals was studied and the dissociation constants and potencies of different antagonists were estimated, in guinea-pig and rat. While oxotremorine(More)
A radioisotope method has been developed for measuring the stimulation-evoked release of acetylcholine without the use of cholinesterase inhibitors from the mouse hemidiaphragm preparation which had been loaded with 3H-choline. Evidence has been obtained that 3H-choline was taken up by and released from both innervated and non-innervated mouse hemidiaphragm(More)
The postsynaptic antimuscarinic properties of different nondepolarizing muscle relaxants were compared with their postsynaptic antinicotinic effect. d-Tubocurarine, pipecuronium and vecuronium were the most selective antagonists on postsynaptic nicotinic receptors. Gallamine, diadonium and Duador (RGH-4201) had relatively greater effect on postsynaptic(More)
The effects of physostigmine, tetrahydroaminoacridine (THA) and LF-14 [3,3-dimethyl-1(4- amino-3-pyridyl)urea], a 3,4-diaminopyridine derivative, were compared on inhibition of acetyl- cholinesterase (AChE) activity, and release of [(3)H]acetylcholine (ACh) from rat brain cortical and hippocampal slices. All three compounds caused a concentration dependent(More)
The effect of different non-depolarizing muscle relaxants (gallamine, pancuronium, vecuronium, D-tubocurarine) on [3H]norepinephrine release in response to electrical stimulation was studied in isolated guinea-pig atrium. High pressure liquid chromatography combined with electrochemical and radiochemical detection revealed that the released radioactivity(More)
Using a sensitive radioactive method that measures selectively the evoked release of acetylcholine, it was demonstrated that, when stimulating at 50 Hz, tubocurarine or pancuronium 2 X 10(-5) mol litre-1 or hexamethonium 10(-3) mol litre-1 significantly decreased the evoked release of acetylcholine in the mouse in vitro phrenic nerve-hemidiaphragm(More)
The influence of nondepolarizing muscle relaxants (MR) on the resting and electrically evoked release of tritiated norepinephrine (3H-NE) was investigated, in the absence and presence of 10(-4) mol/l cocaine, in the in vitro right atrium preparation of guinea pigs (g.p.) preloaded with 3H-NE. In the absence of MR both resting and stimulated 3H and 3H-NE(More)
The relative contributions of the pre- and postsynaptic components of the myoneural blocking effect of different antibiotics were studied using: (a) a radio-active method that measures selectively the Ca(2+)-dependent, stimulation evoked, quantally released, (3)H-acetylcholine ((3)H-ACh) from the mouse in vitro phrenic nerve-hemidiaphragm preparation(More)
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