The effect of cortisol administration on blood plasma immunoglobulin M (IgM) concentrations in masu salmon (Oncorhynchus masou) |
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Authors: | Masaki Nagae Hirotoshi Fuda Kazuhiro Ura Hiroshi Kawamura Shinji Adachi Akihiko Hara Kohei Yamauchi |
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Affiliation: | (1) Department of Biology, Faculty of Fisheries, Hokkaido University, Hakodate, Hokkaido 041, Japan;(2) Nanae Fish Culture Experimental Station, Faculty of Fisheries, Hokkaido University, Kameda, Hokkaido 041-11, Japan;(3) Makkari Branch, Hokkaido Fish Hatchery, Abuta, Hokkaido, 048-16, Japan;(4) Department of Biology, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041, Japan |
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Abstract: | Immunoglobulin M (IgM) is known as a main factor in the humoral immune system of teleosts. In the present study, the effect of cortisol on plasma IgM concentrations was investigated using a specific antibody to IgM in masu salmon (Oncorhynchus masou). Cortisol was orally administered each day for 2 weeks at a dose of 1 mg g−1 in the diet, and for the following week the fish were fed a non-treated diet. Blood plasma samples were collected at 0, 1, 2 and 3 weeks after the initiation of treatment. Oral administration of cortisol elevated plasma cortisol concentrations to about 40 ng/ml for 2 weeks after administration and slightly reduced plasma IgM concentration; the suppression was statistically significant one week after the period of hormone administration. However, treatment with cortisol did not affect plasma concentrations of total protein or α1-protein, one of the major serum proteins, during the experimental period. These results indicate that cortisol specifically suppresses plasma IgM concentrations. |
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Keywords: | IgM cortisol administration immunosuppression masu salmon |
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