Related Experiment Video
Updated: Aug 15, 2026
Analysis of Raw and Processed Cyperi Rhizoma Samples Using Liquid Chromatography-Tandem Mass Spectrometry in Rats with Primary Dysmenorrhea
Published on: December 23, 2022
[Effect of proanthocyanidins on COX-2 enzyme activity and COX-2 mRNA /protein expression in LPS-induced RAW264.7
Mei-jun Chen1, Tong Liang, Ke-yuan Zhou
1Department of Biochemistry, Guangdong Medical College, Zhanjiang 524023, China.
Aim:
To study the effect of proanthocyanidins on the COX-2 enzyme activity and COX-2 protein expression in LPS-induced RAW264.7 cells.
Methods:
After being pretreated with different concentrations of proanthocyanidins for 30 min, and then 1 mg x L(-1) LPS for 9 h, the effect of proanthocyanidins on the activity of COX-2 enzyme in RAW264.7 cells was analysed by radioimmunoassay (RIA). After being pretreated with different concentrations of proanthocyanidins for 30 min, and then 1 mg x L(-1) LPS for 9 h, the effects of proanthocyanidins on the expressions of COX-2 mRNA and protein in RAW264.7 cells were analysed by RT-PCR and Western blotting.
Results:
The activity of COX-2 enzyme was not inhibited by proanthocyanidins (0. 8, 4 and 20 mg x L(-1), P > 0.05 vs LPS group), but the activity of COX-2 enzyme was significantly inhibited by 10 micromol x L(-01) NS-398 (P < 0.01 vs LPS group). The expression of COX-2 mRNA was inhibited by proanthocyanidins (0. 8, 4 and 20 mg x L(-1)). The expression of COX-2 protein was inhibited by proanthocyanidins (4 and 20 mg x L(-1)).
Conclusion:
Proanthocyanidins had no effect on the activity of COX-2 enzyme in LPS-induced RAW264. 7 cells. Proanthocyanidins inhibited significantly the expression of COX-2 mRNA and protein in LPS-induced RAW264.7 cells.