:: Volume 11, Number 5 (September-October 2017) ::
IJT 2017, 11(5): 45-51 Back to browse issues page
Estradiol Affects Prolactin Producing Cells and Calcium levels in a Teleost, Heteropneustesfossilis, Kept in Different Calcium Concentrations
Susmita Srivastav, Diwakar Mishra, Sunil Kumar Srivastav, Nobuo Suzuki, Ajai Kumar Srivastav *
Department of Zoology, D. D. U. Gorakhpur University, Gorakhpur-273009, India. , ajaiksrivastav@hotmail.com
Abstract:   (74 Views)
Background: This study investigated the effects of estradiol on plasma calcium and prolactin cells of Heteropneustes fossilis kept in calcium-deficient and normal freshwater.
Methods: Fish were deprived of food and divided into groups A-D. Group A and B were kept in artificial freshwater with normal electrolytes. Group C and D were maintained in calcium-deficient freshwater. Vehicle was administered to groups A and C. Groups B and D were injected with estradiol. Plasma calcium levels and prolactin cells were studied after 1, 3, 5, 10 and 15 days.
Results: Normal-calcium freshwater: In group A calcium levels remained unaffected. In group B, estradiol provoked hypercalcemia from day 3 to 10 although calcium decreased after day 15. Prolactin cells in group B became degranulated after 10day. Nuclear volume increased from day 10 onwards.
Calcium-deficient freshwater: Calcium levels in group C decreased from day 1 to 3 thereafter increased from day 5 to 15. Plasma calcium of group D increased from day 3 to 15. In group C prolactin cells exhibited hyperactivity on day 3 and degranulation on day 5. Nuclear volume increased from day 5 onwards. On day 10 and 15 certain cells became degenerated. In group D degranulation of prolactin cells began on day 3 which proceeded to complete degranulation on day 10. Nuclear volume increased from day 5 onwards.
Conclusions: Estradiol enhanced prolactin production and increased blood calcium in food-deprived fishes kept in calcium-deficient medium suggesting that calcium needed for elevation of blood calcium was derived from internal sources.
Keywords: Calcium, Catfishes, Estradiol, Fishes, Prolactin
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Type of Study: Research | Subject: General



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Volume 11, Number 5 (September-October 2017) Back to browse issues page