Thyroid hormone modulation of ovarian recrudescence
of air-breathing catfish Clarias gariepinus |
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| Authors: | A Supriya K Raghuveer I Swapna M K Rasheeda T Kobayashi Y Nagahama Aparna Dutta Gupta K C Majumdar B Senthilkumaran |
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| Institution: | (1) Department of Animal Sciences, School of Life Sciences, University of Hyderabad, P.O. Central University, Gachibowli, Hyderabad, 500 046, India;(2) National Research Institute of Aquaculture, Tamaki Mie, 516-0423, Japan;(3) Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan;(4) Centre for Cell and Molecular Biology, Hyderabad, 500 007, India |
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| Abstract: | In the present study, thiourea-induced thyroid hormone depletion and thyroxine (T4) ‘overdose’ were used as a strategy to understand the influence of thyroid hormones on ovarian recrudescence of juvenile
(3-months-old), immature (8-months-old) and adult (1-year-old) air-breathing catfish, Clarias gariepinus. Thiourea-induced thyroid hormone depletion in juvenile catfish impaired ovarian development, but no significant effect was
observed in immature catfish and during late stage of ovarian recrudescence of mature catfish. T4 treatment in females undergoing late stages of ovarian recrudescence induced rapid oocyte growth by promoting its early entry
into maturational phase as evident from the presence of more number of vitellogenic and post-vitellogenic follicles, decrease
in aromatse immunoreactivity and reduced estradiol–17β levels. Hence, thyroid hormones have an important role to play during early stages of ovarian development and vitellogenesis
of catfish and also indicating that thyroid has a stage dependent effect on ovary. |
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| Keywords: | Aromatase Estradiol– 17β Ovary Thyroxine Thiourea |
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