Fig. 7.

Effect of retinoic acid (RA) isomers on antioxidant defense enzymes of MCF-7 cells. MCF-7 cells were seeded at 3×10⁴ cells and incubated with 1 µM RA isomers. SOD activites did not show a significant change, but catalase & GPx activities decreased the most by all-trans RA. Results are expressed as relative % of enzymes' activities. Values are means ± S.D. of three independent experiments. ^*p<0.05, ^**p<0.01: compared to the control group