1988
DOI: 10.1016/0016-6480(88)90274-2
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Steroidogenic activities of two distinct salmon gonadotropins

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Cited by 187 publications
(79 citation statements)
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“…It appears that sGTHI is a newly discovered molecule, while sGTHII corresponds to a maturational GTH. Both sGTHI and sGTHII were found to be equipotent in stimulating maturational steroid synthesis (32). The ratio of plasma levels and pituitary contents of GTHs suggests that sGTHI is the predominant GTH during viterogenesis and early stages of spermatogenesis in salmonids, whereas sGTHII is predominant at the time of spermiation and ovulation.…”
Section: Discussionmentioning
confidence: 98%
“…It appears that sGTHI is a newly discovered molecule, while sGTHII corresponds to a maturational GTH. Both sGTHI and sGTHII were found to be equipotent in stimulating maturational steroid synthesis (32). The ratio of plasma levels and pituitary contents of GTHs suggests that sGTHI is the predominant GTH during viterogenesis and early stages of spermatogenesis in salmonids, whereas sGTHII is predominant at the time of spermiation and ovulation.…”
Section: Discussionmentioning
confidence: 98%
“…Despite differences in detailed steroidogenic potency, both FSH and LH stimulated in vitro production of estradiol-17b (E2) by vitellogenic ovarian tissues in chum salmon, Oncorhynchus keta (Suzuki et al 1988b), coho salmon, O. kisutch (Planas et al 2000), goldfish, Carassius auratus (Van Der Kraak et al 1992), red seabream, Pagrus major (Tanaka et al 1993), and tuna, Thunnus obesus (Okada et al 1994), and in vitro 11-ketotestosterone (11-KT) production by spermatogenic testicular tissue in coho salmon (Planas & Swanson 1995). In contrast, only LH stimulates in vitro production of the maturationinducing steroid, 17a,20b-dihydroxy-4-pregnen-3-one (DHP), by the mature follicles of salmonids (Suzuki et al 1988b, Planas et al 2000 and the induction of germinal vesicle breakdown in mature oocytes of red seabream (Kagawa et al 1998). However, data on unique function of FSH are limited to date, i.e.…”
Section: Introductionmentioning
confidence: 99%
“…chum salmon (Oncorhynchus keta) 1,2,3 , coho salmon (Oncorhynchus kisutch) 4 and Japanese eel (Anguilla japonica) 5 . GTH I and GTH II are structurally homologous to the tetrapod follicle stimulating hormone (FSH) and luteinizing hormone (LH), respectively 1,2,4,6 . It has been suggested that GTH I and GTH II possess different functions; GTH I contributes to early spermatogenesis and follicular growth, whereas GTH II encourages the maturation of gametes and is implicated in spermiation and ovulation 6,7,8 .…”
Section: Introductionmentioning
confidence: 99%
“…GTH I and GTH II are structurally homologous to the tetrapod follicle stimulating hormone (FSH) and luteinizing hormone (LH), respectively 1,2,4,6 . It has been suggested that GTH I and GTH II possess different functions; GTH I contributes to early spermatogenesis and follicular growth, whereas GTH II encourages the maturation of gametes and is implicated in spermiation and ovulation 6,7,8 . Although, the two distinct GTHs have been identified in several fish, there are still a number of species, such as the European eel (Anguilla anguilla) 9 , chinook salmon (Oncorhynchus tschawytsha) 10 , tilapia (Orechromis mossambica) 11 , the African catfish (Larias gariepinus) 12,13 , and female sand goby (Oxyeleotris marmoratus) 14 in which only GTH II has been identified.…”
Section: Introductionmentioning
confidence: 99%