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J Neurophysiol 71: 808-810, 1994;
0022-3077/94 $5.00
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Journal of Neurophysiology, Vol 71, Issue 2 808-810, Copyright © 1994 by APS

ARTICLES

Calcium imaging reveals nicotinic acetylcholine receptors on cultured mushroom body neurons

G. Bicker and S. Kreissl
Institut fur Neurobiologie, Freien Universitat Berlin, Germany.

1. We used fluorescence imaging with the visible wavelength indicator fluo-3 to investigate the calcium responses to cholinergic ligands of honeybee Kenyon cells in primary culture. 2. Application of acetylcholine (ACh) or nicotine, but not pilocarpine, promoted a calcium influx into the cell body and neurites. The increase in intracellular calcium after ACh stimulation was blocked by alpha-bungarotoxin. These results support previous histochemical studies that suggested the expression of nicotinic cholinergic receptors on Kenyon cells. 3. After depolarization with high K+ solution fluorescence increased in the somata and neurites, which indicates the presence of voltage-gated Ca2+ channels in Kenyon cell membranes.


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