Effects of triiodothyronine and of some gonadotropic and steroid hormones on the maturation of carp (Cyprinus carpio L.) oocytes in vitro

Epler, P.; Bieniarz, K.

doi:10.1051/rnd:19830707

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…It would seem that corticosteroids are not involved in the maturation process in the goldeye, although the effects of 1 1-deoxycorticosteroids (generally the most active corticosteroids (Goetz 1983)) remain to be tested. Similarly, synergies of T3 with SGA or 17a,20PP were not in evidence in the present study, in contrast to results of experiments with carp (Epler and Bieniarz 1983). In the carp, T3 appears to deliver some sort of metabolic stimulus as the GtHs used (partially purified cGtH and carp pituitary homogenate) were ineffective when used alone.…”

Section: Time (Hours)contrasting

confidence: 85%

Final maturation and ovulation of oocytes of the goldeye, Hiodon alosoides (Rafinesque), in vitro

Pankhurst¹

1985

Can. J. Zool.

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PANKHURST, N. W. 1985. Final maturation and ovulation of oocytes of the goldeye, Hiodon alosoides (Rafinesque), in vitro.Can. J. Zool. 63: 1003-1009. Oocytes from preovulatory goldeye were cultured in vitro and final maturation was observed in response to treatment with piscine gonadotropins (GtH) and progestational steroids. Final maturation consisted of nuclear migration and breakdown, and coalescence of yolk material to form a single large oil droplet. Both events were under hormonal control with median effective dose values of 1 -5 pg . mL ' for piscine Gt H and 0.1 -0.6 pg . mL ' for pregnenolone. progesterone. 17aOH pregnenolone, 17aOH progesterone, and 17a ,20P-di hydroxy-4-pregnen-3-one. Neither cortisol nor triiodothyronine potentiated the effects of GtH or progestogens, and both were ineffective alone as was human chorionic gonadotropin. Ovulation was observed in some treatments with GtH, and prostaglandin F2,, salt stimulated ovulation of oocytes matured with GtH or 17a,20P-dihydroxyprogesterone. A synthetic analogue of luteinizing hormone-releasing hormone, LH-RHA, had no effect on maturation or ovulation, in contrast to its inhibitory action on GtH-stimulated steroid production in mammals. Follicles from fish in mid and late stages of vitellogenesis were unresponsive to hormone treatment in vitro. PANKHURST, N. W. 1985. Final maturation and ovulation of oocytes of the goldeye, Hiodon alosoides (Rafinesque), in vitro.Can. J. Zool. 63: 1003-1009. Des ovocytes de laquaiches aux yeux d'or (Hiodon alosoides) ont ete gardes in vitro afin de permettre I'etude de la phase finale de maturation apres traitement a des gonadotropines de poisson (GtH) et a des steroi'des progestatives. La phase finale de la maturation comprend la migration du noyau et sa rupture, de meme que la fusion des substances vitellines en une seule grosse goutelette d'huile. Ces deux etapes sont sous le contrhle d'hormones et les valeurs de la dose mkdiane effective enregistrees etaient de 1-5 pg . m L ' dans le cas de la GtH de poisson. de 0.1 -0.6 pg . mL ' dans le cas de la pregntnolone, de la progesterone, de la 17aOH-pregnenolone, de la 17aOH-progesterone et de la 17a,20P-dihydroxy-4-pregnen-3-one. Ni I'hydrocortisone, ni la triiodothyronine n'ont augmente les effets de la GtH ou des progestogenes, et ces substances seules sont restkes inefficaces de meme que la gonadotropine chorionique humaine. Certains traitements a la GtH ont provoque I'ovulation et des ovocytes parvenus a I'ovulation par traitement a la prostaglandine F2(, ont atteint la maturite apres traitement a la GtH ou a la 17a,20P-dihydroxyprogesterone. Une hormone analogue de I'hormone liberatrice de I'hormone luteinisante, la LH-RHA, est restke sans effet sur la maturation ou I'ovulation, alors qu'elle a ordinairement une action inhibitrice sur la production de stdroi'des stirnulee par la GtH chez les mammifkres. Les follicules de poissons aux stades intermediaire et avance de la vitellogenese sont restes inactifs en reaction aux traitements hormonaux in vitro.

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Section: Time (Hours)contrasting

confidence: 85%

Final maturation and ovulation of oocytes of the goldeye, Hiodon alosoides (Rafinesque), in vitro

Pankhurst¹

1985

Can. J. Zool.

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“…A synergistic effect of thyroid hormones acting in conjunction with gonadotropin to induce ovulation has been reported for goldfish (Carassius auratus; Hurlburt 1977) and carp (Cyprinus carpio; Epler and Bieniarz 1983). Thyroid hormones may help oocytes of sturgeon (Acipenser stellatus) retain the capacity to respond to gonadotropin under adverse conditions of temperature (Dettlaff and Davydova 1979).…”

Section: Discussionmentioning

confidence: 99%

“…In some salmonid species, blood concentration of thyroid hormones show complex patterns near the time of spawning (White and Henderson 1977;Osborn et al 1978;Leatherland and Sonstegard 1980;Pickering and Christie 1981;Sower and Schreck 1982;Biddiscombe and Idler 1983;Ueda et al 1984;). There is evidence that thyroid hormones may synergize with gonadotropin to promote ovarian steroidogenesis in goldfish (Hurlburt 1977), carp (Epler and Bieniarz 1983), freshwater perch (Sen and Bhattacharya 1981) and rainbow trout . There appear to be seasonal changes in circulating insulin in fish (Plisetskaya et al 1976;Murat et al 1981;Sower et al 1985;Gutierrez et al 1987Gutierrez et al , 1988) that may have some relationship to reproduction either in regard to control of intermediary metabolism or direct action on the gonad analogous to their action in mammals (Poretsky and Kalin 1987).…”

Section: Introductionmentioning

confidence: 99%

Relationship between metabolic and reproductive hormones in salmonid fish

Dickhoff

Yan

Plisetskaya

et al. 1989

Fish Physiol Biochem

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Circulating concentrations of estradiol (E2), vitellogenin (VTG), thyroxine (T4), triiodothyronine (T3) and insulin were measured in reproductively maturing four and five year-old Atlantic salmon. Blood samples were collected from the fish in seawater for one year prior to their spawning in November in fresh water. In females, E2 and VTG were low but detectable from December to July, and then increased to peak levels in September and October. Plasma levels of T4 and T3 were relatively constant in winter and spring, and decreased in July. Plasma concentration of T4 increased in November when the fish returned to fresh water. Plasma T3 levels remained low during the autumn. Both T4 and T3 levels tended to be higher in males than in females during September through November. Plasma insulin concentrations increased during the spring to peak values in May, and then decreased in June and July in fish of both sexes. There was a significant elevation of plasma insulin in males during October, and the levels in males tended to be higher than those found in females during final maturation.

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“…In the carp (Cyprinus carpio, Cyprinidae) treatment of post-vitellogenic ovarian fragments with DHP was more effective in producing mature oocytes in the presence of Ts (Epler and Bieniarz, 1983); T3 alone was modestly effective. In Anabas, T3, and to a lesser extent Tb enhanced cholesterol conversion to progesterone through a mechanism depending on specific protein synthesis (Sen and Bhattacharya, 1981;Kaul and Bhattacharya, 1988;Guin et al, 1993).…”

Section: Ovarian Development and Vitellogenesismentioning

confidence: 99%