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Microelectrophoretic application of antagonists of putative neurotransmitters onto various types of bulbar respiratory neurons.
Metadata
Journalarchives italiennes de biologie1.179Date
1979-Jan
Type
Research Support, Non-U.S. Gov't
Journal Article
Volume
1979-Jan / 117 : 13-22
Author
Böhmer G , Dinse HR , Fallert M , Sommer TJ
Doi
Not Found
PMIDMESH
Alkaloids
Animals
Bicuculline
Cyproheptadine
Flupenthixol
Glutamates
Iontophoresis
Neurons
Neurotransmitter Agents
Propranolol
Rabbits
Respiratory System
Secologanin Tryptamine Alkaloids
Strychnine
Abstract
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 neurons, while the remainder as well as most IE and the 2 EI cells tested were not affected. Cyproheptadine, an antagonist of 5-HT, excited most E neurons. As concerns NE-receptors, those of the alpha-type might be involved in activation of part of the E cells only, whereas all other NE effects (inhibition or activation) are mediated by CNS-specific receptors different from the alpha- and beta-type. 5-HT effects apparently are mediated by two different receptor types.
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Arch Ital Biolarchives italiennes de biologie
Metadata
LocationItaly
FromPISA UNIV PRESS

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