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The effect of hormonal stimulation on steroid levels in tissue incubates of the sterlet (Acipenser ruthenus L.)

  • Comparative and Ontogenic Biochemistry
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Abstract

Sex steroid and cortisol levels were compared in Leibovitz’s L-15 cultural medium after incubation of tissue samples from the intact female and male sterlet (Acipenser rhutenus L.) and from the fishes exposed to hormonal stimulation of sexual maturation by a superactive analog of mammalian gonadotropin-releasing hormone (LH-RH-A). A higher level of 17,20β,21-trihydroxy-4-pregnen-3-one (20βS) was revealed in the cultural medium following incubation of ovarian follicles isolated from females 5 h after LH-RH-A stimulation, as compared to the data obtained for intact females. The addition of 1 μM progesterone (P4) to the cultural medium before incubation of ovarian follicles also led to an increase in the 20βS level in the incubates by the end of the experiment. Cortisol and testosterone levels in the incubates exhibited the same tendency. The blood cortisol level significantly increased in females 5 h after their hormonal stimulation. In males, showing high levels of androgens (testosterone and 11-ketotestosterone) in the blood serum before hormonal stimulation, high levels of these hormones were also detected in the cultural medium after incubation of testicular and liver tissue samples. The addition of P4 to the medium before incubation stimulated the production of sex steroids and cortisol by the gonadal fragments. Upon addition of P4 to the incubation mixture, containing liver tissue samples, the 20βS level increased.

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Correspondence to L. V. Bayunova.

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Original Russian Text © L.V. Bayunova, 2016, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2016, Vol. 52, No. 1, pp. 17—25.

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Bayunova, L.V. The effect of hormonal stimulation on steroid levels in tissue incubates of the sterlet (Acipenser ruthenus L.). J Evol Biochem Phys 52, 17–27 (2016). https://doi.org/10.1134/S0022093016010026

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