Changes in plasma gonadotropin II and sex steroid hormones, and sperm production of striped bass after treatment with controlled-release gonadotropin-releasing hormone agonist-delivery systems.
In: Biology of reproduction, Jg. 57 (1997-09-01), Heft 3, S. 669-75
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Zugriff:
Spermiating striped bass, a perciform fish, were treated with two controlled-release gonadotropin-releasing hormone agonist (GnRHa)-delivery systems, and the resulting changes in plasma gonadotropin II (GTH II), testosterone (T), 11-ketotestosterone (11-KT), 17,20beta-dihydroxy-4-pregnen-3-one (17,20beta-P), and 17,20beta,21-trihydroxy-4-pregnen-3-one (17,20beta,21-P) were correlated with changes in milt production and sperm density. GnRHa-delivery systems induced a sustained elevation of plasma GnRHa and GTH II for 14 days. Plasma T levels were unchanged after GnRHa treatment, while 11-KT levels increased significantly. Plasma 17,20beta-P also increased after GnRHa treatment and remained elevated compared to levels in controls, while plasma 17,20beta,21-P levels were unaffected. Both GnRHa-delivery systems induced many-fold increases in total expressible milt, lasting throughout the 14 days of the study. Sperm density decreased 2 days after GnRHa treatment, with a subsequent increase by Day 7. This study demonstrates that GnRHa-delivery systems induce a sustained elevation of plasma GTH II levels in striped bass, resulting in a long-term enhancement of milt production. The endocrine changes observed suggest that 11-KT and 17,20beta-P, but not 17,20beta,21 -P, are mediating the effects of GTH II on spermiation.
Titel: |
Changes in plasma gonadotropin II and sex steroid hormones, and sperm production of striped bass after treatment with controlled-release gonadotropin-releasing hormone agonist-delivery systems.
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Autor/in / Beteiligte Person: | Mylonas, CC ; Scott, AP ; Vermeirssen, EL ; Zohar, Y |
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Zeitschrift: | Biology of reproduction, Jg. 57 (1997-09-01), Heft 3, S. 669-75 |
Veröffentlichung: | 2017- : New York : Oxford University Press ; <i>Original Publication</i>: Champaign, Ill. : Society for the Study of Reproduction, 1997 |
Medientyp: | academicJournal |
ISSN: | 0006-3363 (print) |
DOI: | 10.1095/biolreprod57.3.669 |
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