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Enhancement of sensitivity in photoreceptors of the honey bee drone by light and by Ca2+ by Bernd Walz is a Neuroscience article available to read on EtoBox.

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Deeply dark adapted (1 h) photoreceptor cells of the honey bee drone show a light-induced enhancement of sensitivity (facilitation) as an aftereffect of illumination or in the presence of dim backgrounds. The Ca 2 § of this effect was studied: Reduction of extraceUular Ca 2 § to 0.1 mM decreases the sensitivity of a dark adapted cell, and the light-induced increase in sensitivity due to repetitive, dim, 20 ms test flashes is slower than in normal saline. After a sensitizing conditioning light, the sensitivity drops faster in lowcalcium saline. The light-induced enhancement of sensitivity is mimicked by pressure injections of low amounts of Ca 2+ (Ca2+/EGTA-buffers; 0.15 gM free Ca 2+) into a dark adapted cell. Injection of EGTA alone decreases the sensitivity. Injection of a solution containing cal mM free Ca 2 § sequentially decreases and later increases the sensitivity transiently. These results suggest a model in which a progressive increase in intracellular Ca 2 § concentration by light first increases (facilitates), and, at higher concentrations, decreases (light adapts) the sensitivity of the cells. One possible site of action for this positive and negative feedback control o

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Author

Bernd Walz

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0340-7594)

Published

1992

Language

EN

Field

Neuroscience (Life Sciences)