...Brian McNeill; Colin J. Montpetit; Steve F. Perry SUMMARY The goal of the present study was to assess the catecholamine secretory capabilities of rainbow trout Oncorhynchus mykiss chromaffin cells experiencing desensitization of the nicotinic receptor. It was hypothesized that the potential...

... and nicotinic receptors is proposed, since atropine and tubocurarine (at 10 –3 mol l –1) inhibited 99 % and 71 %, respectively, of the light emitted. Study of the subtypes of cholinergic receptors involved in photogenesis revealed that several subtypes of muscarinic receptors might be involved. It was also...

... release during acute hypoxia during periods of nicotinic receptor desensitisation.Despite nicotinic receptor desensitisation induced by intravenous infusion of nicotine (1.3×10 –5 mol kg –1 h –1), plasma catecholamine levels were increased to levels (adrenaline plus noradrenaline 125–200 nmol l –1...

... cell nicotinic receptors and (ii) to assess the ability of fish to secrete catecholamines during acute hypoxia with or without functional nicotinic receptors. Intra-arterial injection of nicotine (6.0×10 −7 mol kg −1) caused a rapid increase in plasma adrenaline and noradrenaline levels; the magnitude...

... with neostigmine (an anticholinesterase) prolonged and more than doubled the amount of adrenaline secreted in response to electrical stimulation. Second, pre-treatment with the nicotinic receptor antagonist hexamethonium inhibited the electrically evoked secretion of adrenaline and noradrenaline. Third, perfusion...

... depolarization was produced by the activation of a cationic conductance mediated by receptors with a pharmacological profile similar to that of the α9 nicotinic receptors and was not a byproduct of the early phases of the cholinergic response. The response seemed to be initiated in the extensive neuropilar...

.... In addition, the Retzius neurons from standard segments could also be phasically excited by ACh. The receptors responsible for the excitation fit into the classification of neuronal nicotinic receptors, whereas the receptors mediating the inhibition are closer in type to the muscular nicotinic receptor. 8...

..., Puerto Rico 00901. 11 2 1988 © 1988 by Company of Biologists 1988 acetylcholine nicotinic receptor synapse insect lophotoxin. Lophotoxin is a diterpene lactone isolated from gorgonian corals of the genus Lophogorgia (Fenical et al. 1981). It has recently been shown...