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• W2085102502 endingPage "103" @default.
• W2085102502 startingPage "97" @default.
• W2085102502 abstract "We have recently reported that application of acetylcholine (ACh) or nicotine to the petrosal ganglion—the sensory ganglion of the glossopharyngeal nerve—elicits a burst of discharges in the carotid nerve branch, innervating the carotid body and sinus, but not in the glossopharyngeal branch, innervating the tongue and pharynx. Thus, the perikarya of sensory neurons for the carotid bifurcation exhibit selective cholinosensitivity. Since dopamine (DA) modulates carotid nerve chemosensory activity, we searched for the presence of DA sensitivity at the perikarya of these neurons in the cat petrosal ganglion superfused in vitro. Applications of DA in doses of up to 5 mg to the ganglion did not modify the rate of spontaneous discharges in the carotid nerve. However, if DA was applied 30 s before ACh injections, ACh-evoked reactions were modified: low doses of DA enhanced the subsequent responses to ACh, while high doses of DA depressed the responses to ACh. This depressant effect of DA on ACh responses was partially antagonized by adding spiroperone to the superfusate. Our results show that the response to ACh of petrosal ganglion neurons projecting through the carotid nerve is modulated by DA acting on D2 receptors located in the somata of these neurons. Thus, dopaminergic modulation of cholinosensitivity could be shared also by the membranes of peripheral endings and perikarya of primary sensory neurons involved in arterial chemoreception." @default.
• W2085102502 created "2016-06-24" @default.
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• W2085102502 date "1999-06-01" @default.
• W2085102502 modified "2023-10-15" @default.
• W2085102502 title "Dopamine modulates carotid nerve responses induced by acetylcholine on the cat petrosal ganglion in vitro" @default.
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• W2085102502 doi "https://doi.org/10.1016/s0006-8993(99)01402-x" @default.
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