The nss mutation for lanthanum inhibits light-induced Ca super(2+) influx into fly photoreceptors

Ion-selective calcium microelectrodes were inserted into the compound eyes of the wild-type sheep blowfly Lucilia or into the retina of the no steady state (nss) mutant of Lucilia . These electrodes monitored light-induced changes in the extracellular concentration of calcium ( Delta (Ca super(2+))...

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Bibliographic Details
Published inThe Journal of general physiology Vol. 100; no. 5; pp. 767 - 781
Main Authors Rom-Glas, A, Sandler, C, Kirschfeld, K, Minke, B
Format Journal Article
LanguageEnglish
Published 01.01.1992
Subjects
calcium
Calliphoridae
Diptera
influx
inhibition
lanthanium
light
Lucilia
mutation
photoreceptors
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Summary:Ion-selective calcium microelectrodes were inserted into the compound eyes of the wild-type sheep blowfly Lucilia or into the retina of the no steady state (nss) mutant of Lucilia . These electrodes monitored light-induced changes in the extracellular concentration of calcium ( Delta (Ca super(2+)) sub(o)) together with the extracellularly recorded receptor potential. Prolonged dim lights induced a steady reduction in (Ca super(2+)) sub(o) during light in the retina of normal Lucilia), while relatively little change in (Ca super(2+)) sub(o) was observed in the retina of the nss mutant. Prolonged intense light induced a multiphasic change in (Ca super(2+)) sub(o): the (Ca super(2+)) sub(o) signal became transient, reaching a minimum within 6 s after light onset, and then rose to a nearly steady-state phase below the dark concentration.
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ISSN:0022-1295