Abstract
A polyphenolic component of ginger, 6-gingerol, is widely reported to possess antioxidant, anti-inflammatory and anticancer activities. In the current study, it was aimed to investigate the anticancer effects of 6-gingerol (6-Gin) on azoxymethane (AOM)-induced colon cancer in rats. The results reveal that 6-Gin treatment significantly improves the antioxidant status disturbed by AOM intoxication. The 6-Gin treatment animal group showed enhanced activity of catalase (CAT) (46.6 +/- 6.4 vs. 23.3 +/- 4.3 U/mg protein), superoxide dismutase (SOD) (81.3 +/- 7.6 vs. 60.4 +/- 3.5 U/mg protein) and glutathione-S-transferase (GST) (90.3 +/- 9.4 vs. 53.8 +/- 10 mU/mg protein) (p < 0.05) as compared to the disease control group. Furthermore, the results reveal that AOM significantly enhances the inflammatory response and 6-gingerol potentially attenuates this response, estimated by markers, such as tumor necrosis factor-alpha (TNF-alpha) (1346 +/- 67 vs. 1023 +/- 58 pg/g), C-reactive protein (CRP) (1.12 +/- 0.08 vs. 0.92 +/- 0.7 ng/mL) and interleukin-6 (IL-6) (945 +/- 67 vs. 653 +/- 33 pg/g). In addition, the lipid peroxidation estimated in terms of malondialdehyde (MDA) provoked by AOM exposure is significantly reduced by 6-gingerol treatment (167 +/- 7.5 vs. 128.3 nmol/g). Furthermore, 6-gingerol significantly maintains the colon tissue architecture disturbed by the AOM treatment. Loss of tumor suppressor protein, phosphatase and tensin homolog (PTEN) expression was noticed in the AOM treated group, whereas in the animals treated with 6-gingerol, the positivity of PTEN expression was high. In conclusion, the current findings advocate the health-promoting effects of 6-gingerol on colon cancer, which might be due to its antioxidant and anti-inflammatory potential.