Effect of acid environments on cortisol and cortisol receptor activity in Atlantic salmon,Salmo salar
| Autor: | F. Gottschall, P. K. Chakraborti, M. Weisbart, H. C. Freeman |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
endocrine system
medicine.medical_specialty biology Physiology Chemistry General Medicine Aquatic Science biology.organism_classification Biochemistry River water Tissue specificity Cytosol Plasma cortisol Endocrinology Internal medicine Cortisol binding Cytosol receptor medicine Cortisol receptor activity Salmo |
| Zdroj: | Fish physiology and biochemistry. 7(1-6) |
| ISSN: | 0920-1742 |
| Popis: | The cytosol and nuclear extract of gill tissue obtained from laboratory held Atlantic salmon,Salmo salar manifested saturable cortisol binding of high affinity and low capacity (cytosol: Ka = 0.198 ± 0.024 × 10(9)/M, Nmax = 116.8 ± 20.8 fmol/mg protein; nuclear extract: Ka = 0.823 ± 0.057 × 10(7)/M, Nmax = 1563 ± 330 fmol/mg protein; n = 4). The cytosol receptor activity displayed high steroid and tissue specificity and a single binding peak at 191,000 Da following gel permeation chromatography.Atlantic salmon exposed for 3 or 8 months to waters from the Medway River (pH about 5.1), the Westfield River (pH about 4.8) and calcium carbonate treated Westfield River (pH about 5.6) showed no gill cytosol receptor activity. Cortisol receptor activity in the gill nuclear extracts from fish in limed Westfield River water in December (3 months) was less than half the activity in the fish treated with Medway River water (p < 0.05) although the plasma cortisol values were not different. In May (8 months), the plasma cortisol of fish in limed water was almost twice that of the fish held in acid Westfield River water (p = 0.058). |
| Databáze: | OpenAIRE |
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