期刊
IRANIAN JOURNAL OF FISHERIES SCIENCES
卷 14, 期 1, 页码 289-301出版社
IRANIAN FISHERIES SCIENCE RESEARCH INST-IFSRI
关键词
Aromatase inhibitor; Sex steroid; GSI; Oncorhynchus mykiss
类别
The objective of this study was to contribute to investigate the efficacy of letrozole, a potent non-steroidal aromatase inhibitor, on serum sex steroid levels and oocyte growth in rainbow trout females. Serum steroid levels were measured using an indirect enzyme-linked immunosorbent assay (ELISA) before and 22 days after an initial injection with 1, 2.5 mg kg(-1) and subsequent weekly injection with 2.5 mg kg(-1) letrozole. After the last blood collection, gonad tissues were removed and oocyte diameter and GSI were determined. In all groups treated with letrozole, serum 17 beta-esteradiol levels (E2) decreased significantly and inversely serum 17 alpha-20 beta dihydroxy-4 pregnen-3-one (17 alpha-20 beta-P), testosterone(T) levels increased significantly from 6 to 96 h after injection (p<0.05). The lowest E2 levels, oocyte diameter and GSI were measured in the group treated weekly with 2.5 mg kg(-1) letrozole (p<0.05). This study demonstrates that letrozole has the potential to interfere in the synthesis of endogenous estrogens from androgens and delay gonadal development.
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