Antioxidant and 3-hydroxy-3-methylglutaryl Coenzyme A reductase inhibitory activities of some plant samples

Abstract

The antioxidant activity capacities of some plants, and their inhibitory effects on the HMG-CoA reductase enzyme, the rate-determining enzyme of cholesterol synthesis, were investigated in our study. Antioxidant activity capacity and inhibitory effect of the HMG-CoA reductase enzyme were detected in all plant extracts used in our research. The results obtained determined that both antioxidant activity and % inhibition values of HMG-CoA reductase enzyme increased as the plant extracts concentration increased. The strongest ABTS and DPPH radical scavenging activities were exhibited by pomegranate fruit extract (IC50= 1.07 ±0.04 mg/mL and IC50= 0.39 ±0.01 mg/mL, respectively). At the same time, lemon had the strongest DMPD radical scavenging activity (IC50= 9×10-4 ±6×10-5 mg/mL). The best HMG-CoA reductase inhibitory activity was observed in persimmon fruit extract (IC50= 0.71 ±0.18 µg/mL). The inhibitory power of this extract was much higher than that of the enzyme’s standard inhibitor, Atorvastatin (IC50 = 1.76 ±0.12 µg/mL). The extracts' potent antioxidant and inhibitory properties can be attributed to the rich phytochemical composition of plant extracts. Thus, it may be a potential source of new bioactive compounds effective against oxidative stress, hypercholesterolemia and cardiovascular complications.

Keywords

• Antioxidant activity
• Enzyme
• HMG-CoA reductase
• Inhibition
• Plants

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