Toxicological analysis of synthetic dye orange red on expression of NFκB-mediated inflammatory markers in Wistar rats

Abstract

Orange red is a food and cosmetic coloring agent made by the amalgamation of two azo dyes carmoisine and sunset yellow. The current study demonstrates the effect of different concentrations of orange red on antioxidant status, inflammatory biomarkers (TNFα, IFNγ, IL1β, IL6, COX-2, iNOS, and NFκB/p65), biochemical enzymes, and liver histology. In totality, 25 male Wistar rats were procured and arbitrarily alienated into 5 different groups each with 5 animals. Group I was taken as the control. Groups II–V were designated as treatment groups. Groups II and III were administered with (5 and 25 mg/kg b.wt.) and groups IV and V with (150 and 300 mg/kg b.wt.) of orange red via oral gavage for 30 days. It was observed that both low and high concentrations of orange red (25, 150, and 300 mg/kg) remarkably augmented the levels of serum inflammatory cytokines (TNFα, IFNγ, IL1β, and IL6) and the protein and gene expression of COX-2, iNOS, and NFκB/p65. A significant decrease in glutathione reductase, glutathione peroxidase, glutathione-S-transferase, superoxidase dismutase, and catalase activity was observed with increasing concentration of orange red. Furthermore, an increase in the level of several vital biochemical parameters and damage severity to hepatic tissue was also found dose dependent.

Keywords:

• Cyclooxygenase-2
• cytokines
• inflammation
• orange red
• oxidative stress

Acknowledgments

Furthermore, the authors are very much thankful to Department of Clinical Biochemistry, University of Kashmir, India, where all experiments were conducted. Finally, the authors would like to pay respect and homage to experimental Wistar rats who sacrificed themselves for the wellbeing of human kind.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

Great thankfulness is given to University Grants Commission (UGC), India, for providing financial assistance as JRF/SRF fellow.