Studies on teleost corpuscles of Stannius: Physiological and biochemical aspects of synthesis and release of hypocalcin in trout,goldfish and eel |
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| Authors: | Gert Flik Teresa Labedz Floris P. J. G. Lafeber Sjoerd E. Wendelaar Bonga Peter K. T. Pang |
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| Affiliation: | (1) Department of Animal Physiology, Faculty of Science, University of Nijmegen, Toernooiveld 25, 6525 ED Nijmegen, The Netherlands;(2) Department of Physiology, School of Medicine University of Alberta, Edmonton, Alberta, Canada, T6G 2H7;(3) Department of Animal Physiology, Faculty of Science, University of Nijmegen, Toernooiveld 25, 6525 ED Nijmegen, The Netherlands |
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| Abstract: | Hypercalcemia (induced by CaCl2-injection or seawater exposure of the fish) reduced the hypocalcin content of corpuscles of Stannius (CS) in trout, goldfish and eel; concomitantly the synthetic activity of CS of hypercalcemic fish, as determinedin vitro, was enhanced. The monomeric forms of prohypocalcin and of hypocalcin of trout and goldfish are 32 and 28 kDA Mr glycoprotein species respectively; those of the eel are 2 kDa bigger,viz. 34 and 30 kDa respectively. Moreover, eel CS producein vitro an enigmatic 70 kDa glycoprotein with affinity for concanavalin-A. It is concluded that plasma calcium levels control storage and synthesis rates of hypocalcin in the CS. |
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| Keywords: | trout goldfish eel fresh water seawater hypercalcemia hypocalcin glycoprotein secretory protein concanavalin-A |
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