For a long time it was thought that the corpuscles of Stannius (CS) of holostean and teleostean fishes produce a single hormone reducing Ca2+ influx from the water via the gills. We here present data showing that two separate bioactive principles are present in the CS: stanniocalcin (STC), a 56 kDa glycoprotein, and teleocalcin (TC), a 3 kDa glycopeptide. STC indeed inhibits Ca2+ influx (as reported many times before) but does not affect the Ca2+- and Mg2+-dependent phosphatase activity located in the gill plasma membrane. TC does not affect Ca2+ influx but inhibits the Ca2+- and Mg2+-dependent phosphatase activity. Thus, the Ca2+- and Mg2+-dependent phosphatase activity appears not to be involved in transbranchial Ca2+ transport. We conclude that STC is the pivotal calcium-regulating hormone in fish and that TC has an as yet unidentified role in gill physiology through its phosphatase-reducing activity.
INDICATIONS FOR TWO BIOACTIVE PRINCIPLES IN THE CORPUSCLES OF STANNIUS
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P. M. Verbost, A. Butkus, P. Willems, S. E. Wendelaar Bonga; INDICATIONS FOR TWO BIOACTIVE PRINCIPLES IN THE CORPUSCLES OF STANNIUS. J Exp Biol 1 April 1993; 177 (1): 243–252. doi: https://doi.org/10.1242/jeb.177.1.243
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