PMID: 45300Jan 1, 1979

Microelectrophoretic application of antagonists of putative neurotransmitters onto various types of bulbar respiratory neurons

Archives italiennes de biologie
G BöhmerT J Sommer


Seven antagonists of putative neurotransmitters were applied to bulbar respiratory neurons and, for comparison, also to unspecific cells. The antagonists exerted distinct effects when released alone, permitting to draw conclusions about receptor properties of the various cell types. With strychnine, specific antagonist of glycine, excitation prevailed in EI, I and E neurons. With bicuculline, specific antagonist of GABA, excitation preponderated in EI and E cells. About half of the unspecific neurons were activated and the remainder were unresponsive. GDEE (glutamatediethylester), antagonist of glutamate, excited part of the IE neurons and inhibited part of the E units, while the remainder of both types as well as 2 EI cells tested were not affected. With flupentixol, antagonist of dopamine, excitation prevailed in I neurons. About half of the IE and E units remained unaffected, while in the remainder E cells inhibition preponderated over excitation. With yohimbine, an alpha-adrenoceptor blocker, inhibition prevailed in E units. The two EI as well as the majority of the I neurons remained unaffected, with two cells of the latter type being activated. Propranolol, a beta-adrenoceptor blocker, inhibited about half of the E neuron...Continue Reading

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