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IGF1 stimulates differentiation of primary follicles and their growth in ovarian explants of zebrafish (Danio rerio) cultured in vitro

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Abstract

The present study is an attempt to elucidate the involvement of insulin-like growth factor (IGF1) in the differentiation and growth of primary follicles in ovarian explant cultures of zebrafish. Ovaries from adult females were cultured in triplicate sets/treatment group for 15 days at 22°C in the laboratory. Culture medium was supplemented with either insulin (1 ng/mL) or IGF1 (1 ng/mL) or insulin + IGF1 (Experiment 1) or 0.1 or 1.0 or 10 ng/mL of IGF1 (Experiment 2). Ovaries cultured in medium alone served as controls and those fixed at the beginning of the culture as initial controls. Experiments were repeated. On the 16th day ovarian explants were fixed in Bouin’s fluid and processed for paraffin embedding, sections (3 µm) were cut and stained with hematoxylin-eosin. Follicles were classified into 6 stages and atretic follicles (AF). Previtellogenic, vitellogenic and total follicle number was calculated. At the start of the culture, ovaries contained all stages of growing and degenerating follicles. In in vitro cultured control ovaries, vitellogenic follicles underwent atresia, while, primary follicles remained unaffected. Insulin or insulin + IGF1 treated ovaries did not differ significantly while IGF1 exposed ovarian explants had greater (P < 0.05) number of primary follicles compared to controls. IGF1 also caused an increase in the number and growth of primary follicles in a dose dependent manner although; cultures were not supplemented with gonadotrophic hormones. Results suggest that locally derived intra-ovarian IGF1 may have a role in the differentiation and growth of primary follicles in zebrafish ovary.

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Acknowledgements

This work was supported by UGC-SAP DSA-Phase I [F. 4-18/2015/DSA-I (SAP-II)] grant from New Delhi, India.

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Authors and Affiliations

  1. Department of Zoology, Karnatak University, Dharwad, Karnataka, India

    Pancharatna A Katti, Sheetal S Narvekar, Basavaraj B Goundadkar & Prasad A Deshpande

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  1. Pancharatna A Katti
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  2. Sheetal S Narvekar
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  3. Basavaraj B Goundadkar
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  4. Prasad A Deshpande
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Correspondence to Pancharatna A Katti.

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Corresponding editor: Subhash C Lakhotia

Corresponding editor: Subhash C Lakhotia

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Katti, P.A., Narvekar, S.S., Goundadkar, B.B. et al. IGF1 stimulates differentiation of primary follicles and their growth in ovarian explants of zebrafish (Danio rerio) cultured in vitro . J Biosci 42, 647–656 (2017). https://doi.org/10.1007/s12038-017-9716-3

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