Cyst hatching in Anostraca accelerated by retinoic acid,amplified by Calcium Ionophore A23187, and inhibited by Calcium-channel blockers |
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| Authors: | Henri J Dumont Pascal Casier Natesan Munuswamy Christine De Walsche |
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| Institution: | (1) Institute of Animal Ecology, University of Ghent, Ledeganckstraat 35, B-9000 Gent, Belgium;(2) Present address: Life Science Building, University of Madras, Guindy Campus, 600 025 Madras, India |
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| Abstract: | Cyst hatching, under standardized conditions, of the Anostracan species Thamnocephalus platyurus and Streptocephalus dichotomus was significantly accelerated but not increased by applying the morphogen retinoic acid (RA). Cyst hatching was enhanced but not accelerated by artificially increasing the inflow of Ca2+ to the embryonic cells, using Calcium Ionophore A 23 187. Cyst hatching was accelerated and amplified, to a level in excess of the summed effects of each treatment, by a combined application of RA and ionophore. It was inhibited almost quantitatively by the Calcium-channel blockers Nifedipin and Verapamil. The significance of these findings is discussed. |
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| Keywords: | Anostraca Thamnocephalus Streptocephalus cyst hatching differentiation retinoic acid ionophores Calcium-channel blockers |
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