Ameliorative effects of nano-elemental selenium against hexavalent chromium-induced apoptosis in broiler liver

Abstract

The current study examined the ameliorative effects of nano-elemental selenium (Nano-Se) against chromium-VI (K₂Cr₂O₇)-induced apoptosis in chickens. The expression of apoptosis-related genes was evaluated by reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and western blot. A total of 60, one-day-old broiler chickens allotted to six equal groups, i.e., control group (standard diet), Cr(VI)-exposed group (K₂Cr₂O₇ via drinking water), Nano-Se group (Nano-Se at 0.5 mg/kg via diet), protection group (K₂Cr₂O₇ + Nano-Se), cure group (K₂Cr₂O₇ for initial 2 weeks and then Nano-Se), and prevention group (opposite to the cure group) and were detected by the activities of pro-apoptosis (Bax, Caspase-3) and anti-apoptosis (Bcl-2) genes expression at day 35 of the experiment. Intense apoptosis was observed in liver tissues of chickens exposed to K₂Cr₂O₇. The Nano-Se supplementation caused a significant decrease (P < 0.01) in the mRNA expression levels of Bax and Caspase-3 genes, while significantly elevated (P < 0.05) mRNA expression level of Bcl-2 gene was observed in Nano-Se experimental groups as compare to control and Cr(VI)-exposed group. The results quantified by the RT-qPCR were further confirmed by the western blot analysis. Altogether, these results suggest anti-apoptotic effects of Nano-Se in the chicken liver, which is interesting for further study. The present findings suggested that Nano-Se has protective effects against K₂Cr₂O₇-induced apoptosis in broilers liver and can serve a key role as a protective agent against apoptosis.

Keywords: Apoptosis; Chickens; Chromium-VI (K2Cr2O7); Nano-selenium.