Abstract
The effects of Ca2+, Mg2+ and Mn2+ on light-evoked electrical responses, ERG and action potentials of optic nerve fibers, were studied in an isolated eye of Lymnaea stagnalis. Signals of both types persisted with minor changes when Mg2+ concentration in the bath solution was increased up to 15 mM. This finding suggests that action potentials of photoreceptor cells are transmitted via their axons directly to central ganglia without a relay in chemical synapses on interneurons. At the same time, the changed spiking pattern may indicate chemical interactions between photoreceptors cells themselves. In the presence of 4 mM EDTA or 10 mM Mn2+, both ERG waves and spiking activity were considerably depressed, probably, as a result of impaired phototransduction in photoreceptor cells.
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Original Russian Text © V.V. Zhukov, A.D. Fedorenko, A.I. Lavrova, E.B. Postnikov, 2017, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2017, Vol. 53, No. 5, pp. 360—367.
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Zhukov, V.V., Fedorenko, A.D., Lavrova, A.I. et al. Electrical responses of Lymnaea stagnalis to light stimulation: Effect of divalent cations. J Evol Biochem Phys 53, 404–413 (2017). https://doi.org/10.1134/S0022093017050064
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DOI: https://doi.org/10.1134/S0022093017050064