Selective specificity of calcium-binding proteins calbindin and calretinin expression in the magnocellular neurosecretory hypothalamic nuclei of tortoises and turtles |
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Authors: | M. G. Belekhova N. B. Kenigfest E. V. Chernigovskaya N. P. Veselkin |
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Affiliation: | 1.Sechenov Institute of Evolutionary Physiology and Biochemistry,Russian Academy of Sciences,St. Petersburg,Russia;2.National Museum of Natural History,Paris,France |
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Abstract: | We have studied the distribution of calcium-binding proteins in the magnocellular neurosecretory nuclei of nonapeptidergic neurosecretory nuclei of the preoptic–hypothalamic complex in a tortoise (Testudo horsfieldi) and a pond turtle (Emys orbicularis) using immunohistochemistry. We have found that different types of cells in the paraventricular and supraoptic nuclei predominantly express calbindin and, to a lesser extent, calretinin, but not parvalbumin. The selective calbindin/calretinin control of the neurohormone secretion in these hypothalamic nuclei is an evolutionary conservative feature typical of reptiles and mammals. |
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