Abstract
Light paired with serotonin (5-HT) in vivo produces both short- and long-term enhancement of generator potentials in identified B-photoreceptors in Hermissenda. The role of intracellular Ca 2+ in the induction of enhancement in B-photoreceptors was assessed by buffering intracellular Ca 2+ with the iontophoretic injection of BAPTA. Blocking light-elicited photoreceptor desensitization with BAPTA loading prior to applying 5-HT was used as an indication of the effectiveness of Ca 2+ buffering. Enhancement was blocked in preparations that received BAPTA loading prior to the application of 5-HT while typical enhancement was elicited by light and 5-HT in control preparations. These results indicate that enhancement involves a Ca 2+-dependent process.
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