NDLI: Cholinergic transmission via central synapses in the locust nervous system

Content Provider	Springer Nature Link
Author	Gauglitz, Sabine Pflüger, Hans Joachim
Copyright Year	2001
Abstract	In this study we examine the nature of chemical synaptic transmission between identified filiform hair receptors on the prothoracic segment of a locust and the identified postsynaptic projection interneuron (A4I1). The effects of pressure ejected acetylcholine, and various ligands of acetylcholine receptors on the activity of the postsynaptic neuron A4I1, or on wind-elicited responses in A4I1 are reported. It is suggested that the transmitter of the afferent fibers is acetylcholine, and that fast transmission is mediated by nicotinic acetylcholine-receptors. Both nicotine and carbachol act as agonists, whereas d-tubocurarine and α-bungarotoxin act as antagonists. The presence of muscarinic acetylcholine receptors was also evident from the modulatory effects of muscarine, oxotremorine and pilocarpine, which were blocked by bath application of atropine. GABA, and its agonists muscimol and cis-4-amino-crotonic-acid lead to inhibition of A4I1 responses. This inhibition was prevented by the additional application of picrotoxin. This suggests involvement of a ligand-gated GABA receptor which, most likely, increases chloride conductance. Metabotropic GABA-receptors do not seem to be involved, since baclofene, diazepam and bicuculline ejections had no effects. Glutamate also inhibits wind elicited A4I1 responses. Although attempts were made to further characterize the receptor involved, tested substances such as kainic acid, glycine, CNQX or GDEE had no effect.
Starting Page	825
Ending Page	836
Page Count	12
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	187
Issue Number	10
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-11-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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