Abstract
Plasma total lipids were significantly higher in 17β-oestradiol (E2)-treated immature rainbow trout Oncorhynchus mykiss at week 4 after implantation, due to increases in polar and neutral lipids. The lipid classes responding were phosphatidylcholine, phosphatidylinositol, phosphatidylethanolamine, sterols and sterol esters, in a proportion that approximately reflected the increase in plasma vitellogenin (VtG) levels as measured by a non-competitive enzyme-linked immunosorbent assay (ELISA). Plasma non-esterified fatty acids and triacylglycerol were not affected by E2 treatment. Plasma growth hormone GH levels were increased, and plasma somatostatin-14 (SRIF) levels decreased in E2-treated fish, responses which could be secondary to elevated plasma lipid (VtG) content, although a direct E2 action on somatotroph function is possible. Plasma T4 concentrations were not affected by E2 treatment, but plasma T3 concentrations were significantly lower than in controls 1 week after implantation when plasma E2 concentrations were the highest; this is in support of the hypothesis that E2 has a suppressive action on T3 production.
Original language | English |
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Pages (from-to) | 605-615 |
Number of pages | 11 |
Journal | Journal of Fish Biology |
Volume | 59 |
Issue number | 3 |
DOIs | |
State | Published - 2001 |
Keywords
- Neutral lipid
- Oestrogen
- Phospholipid
- Polar lipid
- Reproduction
- Vitellogenin