Tropical Journal of Pharmaceutical Research

Original Research Article | OPEN ACCESS

Interaction between green tea and perindopril reduces inhibition of angiotensin-converting enzyme activity

Norsyahida Mohd Fauzi, Endang Kumolosasi , Malina Jasamai, Norazrina Azmi

Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia;

For correspondence:- Endang Kumolosasi Email: e_kumolosasi@ukm.edu.my

Accepted: 18 May 2019 Published: 30 June 2019

Citation: Fauzi NM, Kumolosasi E, Jasamai M, Azmi N. Interaction between green tea and perindopril reduces inhibition of angiotensin-converting enzyme activity. Trop J Pharm Res 2019; 18(6):1185-1190 doi: 10.4314/tjpr.v18i6.6

© 2019 The authors.
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Abstract

Purpose: To investigate the blood pressure-lowering effect of green tea (GT) extract alone and in combination with an angiotensin converting enzyme (ACE) inhibitor, perindopril, on rats.

Methods: The study consisted of four groups of five spontaneously hypertensive rats (SHR): negative control (2 % tragacanth mucilage), positive control group (perindopril, 0.36 mg/kg/day) and two treatment groups (green tea, 25 mg/kg/day; and combined green tea/perindopril). The treatments were given orally for 14 days. Systolic blood pressure was measured before and after treatment using the tail cuff technique. Angiotensin converting enzyme activity in the lung homogenate of the hypertensive rats was determined spectrophotometrically.

Results: Green tea extract significantly reduced the rats’ systolic blood pressure (p < 0.05) but did not inhibit the angiotensin-converting enzyme. The combination of green tea extract with perindopril also caused a significant decline in blood pressure (p < 0.001). However, the green tea extract attenuated the inhibition of the angiotensin-converting enzyme activity by perindopril.

Conclusion: Green tea extract produces anti-hypertensive activity in rats, but its mechanism of action is not via inhibition of angiotensin-converting enzyme. The interaction of GT extract with perindopril results in a reduction of ACE inhibitory activity.

Keywords: Anti-hypertensive, Green tea, Camellia sinensis, ACE inhibitor, Systolic blood pressure, Spontaneously hypertensive rats