Octopamine modulates photoreceptor function in the Limulus lateral eye

Visual Neuroscience
G H RenningerC A Farrell

Abstract

Activity at night in efferent nerve fibers from a central circadian clock produces changes in photoreceptor function in the lateral compound eye of Limulus: the response to light is increased; membrane potential fluctuations (bumps) occurring in the dark are suppressed; and the duration of bumps occurring both in the dark and under dim illumination is increased (Barlow et al., 1977; Kaplan & Barlow, 1980; Barlow, 1983; Barlow et al., 1985). Efferent nerve terminals release octopamine when activated (Battelle et al., 1982; Battelle & Evans, 1984, 1986); exogenous octopamine in vitro produces some of the changes resulting from efferent nerve activity in vivo (Kass et al., 1988). We report here that the increase in both on-transient and steady-state response to light induced by octopamine in the lateral eye in vitro are concentration dependent with threshold at or below 100 nM, saturation at or above 100 microM, and half-maximal increase in the range 1-10 microM. Octopamine also reduces bump activity in the dark in a concentration-dependent way. Unlike the increase in light response, the dependence of this effect on octopamine concentration is extremely variable from specimen to specimen. The effects of exogenous octopamine on lig...Continue Reading

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Citations

Oct 9, 1999·Progress in Neurobiology·T Roeder
May 4, 2013·Integrative and Comparative Biology·B-A Battelle
Feb 20, 2008·Visual Neuroscience·Corrinne C M Lim-KesslerGerald S Wasserman
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Mar 25, 2021·Journal of Neurophysiology·Davis Grininger, John T Birmingham

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