Summary
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1.
Cholinergic mechanisms in the systemic vasculature of the rainbow trout have been pharmacologically analysed using an isolated trunk preparation perfused at constant flow.
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2.
Acetylcholine (ACh) causes a two component vasoconstriction comprising a rapid initial peak (response A) and a long-lasting tail on the initial peak (response B). Skeletal muscle contraction is not involved in either response.
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3.
Response B has a high dose threshold, is nicotinic in nature, and is blocked by α-adrenoreceptor antagonists, procaine, and 0 mM Ca++ plus 20 mM Mg++, indicating a classical indirect action of ACh on sympathetic neurons or chromaffin tissue to cause the release of an adrenergic transmitter.
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4.
Response A has a lower dose threshold, is nicotinic in nature, is resistant to α-adrenergic, muscarinic cholinergic, and adrenergic neuron blockade, is insensitive to tetrotoxin and 0 mM Ca++ plus 20 mM Mg++, but is blocked with some specificity by procaine.
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5.
The properties of the nicotinic receptors of response A differ from those of the traditional ganglionic and skeletal muscle types of higher vertebrates.
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6.
Response A is mimicked by ATP, which appears to act by a direct mechanism in the preparation.
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7.
It is concluded that response A reflects either direct stimulation of nicotinic receptors on vascular tissue or an indirect nicotinic effect resulting in the release of a non-adrenergic, non-cholinergic transmitter such as ATP.
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8.
Unlike the situation in higher vertebrates, no muscarinic dilatory responses to ACh occur in the preparation.
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Wood, C.M. Cholinergic mechanisms and the response to ATP in the systemic vasculature of the rainbow trout. J Comp Physiol B 122, 325–345 (1977). https://doi.org/10.1007/BF00692519
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DOI: https://doi.org/10.1007/BF00692519