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Seasonal dynamics in gonadotropin secretion and E2-binding in the catfish Heteropneustes fossilis

Fish Physiology and Biochemistry volume 31, pages 183–188 (2005)Cite this article

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Abstract

In the present investigation, significant annual/seasonal variations were noticed in plasma and pituitary gonadotropin (GTH) which were correlated with gonado-somatic index, plasma estradiol-17β, and nuclear E2 receptor (NE2R) in the pituitary, hypothalamus and telencephalon. The NE2R concentrations and dissociation constant (k d) values showed significant seasonal variations with high values in the late preparatory phase and low values in the postspawning phase. The NE2R levels were the highest in the pituitary, followed by the hypothalamus and telencephalon in all the seasons. In the prespawning phase, ovariectomy (OVX) elicited a strong negative feedback on GTH secretion with a bimodal pattern of release and elevated the NE2R levels and k d values, without producing any significant change in the resting phase suggesting that E2 appears to exert differential feedbacks on GTH secretion.

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Authors and Affiliations

  1. National Institute of Ocean Technology, Pallikaranai, Chennai, 601302, India

    R. Kirubagaran, B. Senthilkumaran, C. C. Sudhakumari & K. P. Joy

  2. Department of Animal Sciences, School of Life Sciences, University of Hyderabad, P.O. Central University, Gachibowli, Hyderabad, 500 046, India

    B. Senthilkumaran & C. C. Sudhakumari

  3. Department of Zoology, Banaras Hindu University, Varanasi, 221 005, India

    K. P. Joy

Authors
  1. R. Kirubagaran
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  2. B. Senthilkumaran
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  3. C. C. Sudhakumari
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  4. K. P. Joy
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Correspondence to R. Kirubagaran.

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Kirubagaran, R., Senthilkumaran, B., Sudhakumari, C.C. et al. Seasonal dynamics in gonadotropin secretion and E2-binding in the catfish Heteropneustes fossilis . Fish Physiol Biochem 31, 183–188 (2005). https://doi.org/10.1007/s10695-006-0022-5

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  • DOI: https://doi.org/10.1007/s10695-006-0022-5

Keywords

  • Catfish
  • Estradiol-17β
  • E2-binding
  • Gonadotropin
  • Ovariectomy

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