Light-induced changes in the content of inositol phosphates in squid (Loligo pealei) retina. |
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| Authors: | J E Brown D C Watkins and C C Malbon |
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| Affiliation: | Department of Ophthalmology, Washington University School of Medicine, St. Louis, MO 63110. |
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| Abstract: | Illumination induced an increase in inositol polyphosphates, inositol 1,4-bisphosphate and inositol 1,4,5-trisphosphate, in the photoreceptors of the squid, Loligo pealei. There was a concomitant decrease in phosphatidylinositol 4,5-bisphosphate, but no light-induced change in any other phosphoinositide. None of these stimulus-induced changes were altered by treatment in vivo with pertussis toxin, which ADP-ribosylated a Mr-39000-peptide. These findings support the hypothesis that inositol 1,4,5-trisphosphate participates as either a messenger or a modulator in transduction in invertebrate photoreceptors. |
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