Hyposmotic shock-induced discharge in acontia ofCalliactis parasitica is blocked by gadolinium |
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Authors: | A. Salleo G. La Spada M. Drago G. Curcio |
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Affiliation: | (1) Institute of General Physiology, University of Messina, Via Sperone 31, I-98016 Messina, Italy |
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Abstract: | On acontia ofCalliactis parasitica it was observed that mechanical stimuli applied by a gelatin probe, a method effective in tentacles of Anthozoa, do not induce the discharge of nematocytes. Hyposmotic shock, performed by treatment with NaCl solution 35% hyposmotic with respect to sea water, induces, in the presence of Ca2+, the discharge that spreads along the acontial filament, as previously observed following treatment with SCN–. The hyposmotic shock-induced discharge is blocked by Gd3+ at a concentration of 1 M. 10 M Gd3+ prevents also the SCN–-induced discharge. These results suggest the presence of stretch activated cation channels either in nematocytes and/or in supporting cells as well as a possible effect of SCN– on this class of ion channels. |
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Keywords: | Calliactis parasitica nematocytes discharge hyposmotic shock Gd3+ |
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