Effects of salmon prolactin and growth hormone on plasma osmolality, Na+ concentration and protein content in the saffron cod |
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| Authors: | M. Ogawa T. Sugai J. Murata T. Watanuki |
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| Affiliation: | (1) Department of Molecular Biology and Biochemistry, Faculty of Science, Saitama University, 255, Shimo-okubo, Urawa, Saitama, Japan;(2) Department of Regulation Biology, Faculty of Science, Saitama University, 255, Shimo-okubo, Urawa, Saitama, Japan |
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| Abstract: | In saffron cod, Eleginus gracilis, the antifreeze glycoprotein (AFGP) is present during the winter. The effects of salmon prolactin (sPRL) and growth hormone (sGH) on plasma osmolality, sodium concentration and protein content of the saffron cod were investigated. In the winter, plasma osmolality and protein content decreased following the intraperitoneal injection of sPRL (20 µg kg-1 day-1 × 3) but injection of the same dose of sGH had no effect on either plasma osmolality or protein content. In similar experiments performed during the summer, sPRL and sGH had no effect on these parameters. The results suggest that PRL may act on the kidney, possibly clearing antifreeze glycoprotein (AFGP) by increasing glomerular filtration. The possible role of PRL and GH in the disappearance of AFGP during the summer are discussed. |
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| Keywords: | saffron cod salmon prolactin salmon growth hormone plasma osmolality sodium concentration protein content antifreeze glycoprotein cold adaptation |
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