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Nitrite-induced alterations in sex steroids and thyroid hormones of Labeo rohita juveniles: effects of dietary vitamin E and l-tryptophan

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Abstract

An experiment was conducted to study the effect of sub-lethal nitrite exposure on sex steroids (testosterone and estradiol), cortisol and thyroid hormones (T3 and T4) of Labeo rohita juveniles. Fishes previously fed with normal or elevated levels of vitamin E (VE) and tryptophan for 60 days were exposed to sub-lethal nitrite for another 45 days with same feeding regime. There were nine treatment groups, viz. VE0TRP0−N, VE0TRP0+N, VE100TRP0−N, VE100TRP0+N, VE100TRP0.75+N, VE100TRP1.5+N, VE150TRP0+N, VE300TRP0+N and VE200TRP1+N. Except the groups VE0TRP0−N and VE100TRP0−N, all other groups were exposed to nitrite. At the end of the 45 days of nitrite exposure, serum samples were assayed for sex steroids, cortisol and thyroid hormones. The serum T3 and T4 levels decreased to the extent of 84.5 and 94.06 %, respectively, upon nitrite exposure. Dietary supplementation with additional amounts of VE and tryptophan appears to reduce the decline of the production of T4. The serum testosterone and estradiol decreased 97.31 and 92.86 %, respectively, upon nitrite exposure. Supplementation with additional amounts of VE was found to reverse nitrite-induced inhibition of testosterone and estradiol production. Serum cortisol increased upon nitrite exposure and unexposed (VE100−N) group showed lower levels, which were comparable to groups fed with elevated levels of VE. The overall results of the present study revealed that environmental nitrites have a negative impact on steroidogenesis, which can be overcome by dietary supplementation of elevated amounts of VE (minimum of 150 mg VE Kg diet−1) and to a lesser extent by tryptophan (only at the level of 1.5 % of the diet).

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Acknowledgments

The author is grateful to Dr. W.S. Lakra, Director & Vice-chancellor, CIFE, Mumbai, for providing facilities for carrying out the work. The financial support in terms of institutional fellowship by Indian council of agricultural research (ICAR) and Central institute of fisheries education (CIFE) is highly acknowledged.

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Ciji, A., Sahu, N.P., Pal, A.K. et al. Nitrite-induced alterations in sex steroids and thyroid hormones of Labeo rohita juveniles: effects of dietary vitamin E and l-tryptophan. Fish Physiol Biochem 39, 1297–1307 (2013). https://doi.org/10.1007/s10695-013-9784-8

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  • DOI: https://doi.org/10.1007/s10695-013-9784-8

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