Neurohypophysial hormonal control of cortisol secretion in the teleost Carassius auratus |
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| Authors: | James N. Fryer Eric Leung |
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| Affiliation: | Department of Anatomy, School of Medicine, Faculty of Health Sciences, University of Ottawa, Ottawa K1N 9A9, Canada |
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| Abstract: | Intravenous injections of arginine vasopressin (AVP), arginine vasotocin (AVT), and isotocin (IST) produced dose-dependent increments in circulating levels of plasma cortisol in goldfish in which endogenous ACTH secretion was suppressed by prior administration of dexamethasone. Injections of met5-enkephalin (ENK) or saline had no significant effect on plasma cortisol in dexamethasone-blocked fish. These results demonstrate that AVT and IST stimulate cortisol secretion in the goldfish and suggest that in teleosts AVT and IST possess corticotrophin-releasing factor (CRF) activity. |
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