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Pooja Kumari Neeta Sehgal S. V. Goswami Neerja Aggarwal

Abstract

Several external and internal factors contribute to the reproductive success of teleosts, which makes the reproductive process complex and unique. In the Indian freshwater catfish, Heteropneustes fossilis, monsoon plays a crucial role as it fine tunes the neuroendocrine axis, culminating in oocyte maturation. Therefore, induction of oocyte maturation requires the coordinated interaction among hypothalamic, hypophyseal, and peripheral hormones.  In the present investigation, dual neuroendocrine control of oocyte maturation has been demonstrated in the catfish, H. fossilis. The maturational response in gravid catfish is inhibited in the presence of dopamine but GnRH evokes the oocyte maturation and ovulation. GnRH upregulates the expression of lhb gene as well as increases plasma levels of LH significantly within 30 minutes of its administration. Destruction of the preoptic region in gravid catfish by electrolytic or chemical lesions also causes oocyte maturation and ovulation. But this response is inhibited if dopamine is injected into the nucleus preopticus periventricularis-lesioned fishes. These observations support the role of dopamine as an inhibitory factor, therefore specific receptors of dopamine have been characterized in catfish and their expression in the brain has been quantified. Dopamine receptors are upregulated in dopamine-treated fishes and downregulated if a dopamine antagonist (pimozide) is injected. The present study suggests the presence of inhibitory mechanism for LH secretion in gravid catfish. Abolition of this inhibition is necessary to release LH surge, which in turn stimulates resumption of meiosis and ovulation. Thus peptidergic as well as aminergic systems regulate oocyte maturation in H. fossilis. Neuroendocrine regulation of oocyte maturation and ovulation has major implications for inducing spawning in aquaculture.

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Keywords

Dopamine, GnRH, Lesioning, Monosodium L-glutamate, Pimozide

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Kumari, P. ., Sehgal, N. ., Goswami, S. V., & Aggarwal, N. . (2021). Multifactorial control of gonadotropin release for induction of oocyte maturation: Influence of gonadotropin-releasing hormone, gonadotropin release-inhibiting factor and dopamine receptors in the catfish, Heteropneustes fossilis. Journal of Applied and Natural Science, 13(2), 686–699. https://doi.org/10.31018/jans.v13i2.2695
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