A Comparative Study of the Antihypertensive and Cardioprotective Potentials of Hot and Cold Aqueous Extracts of L. in Relation to Their Metabolic Profiles

Overview

Journal Front Pharmacol

Date 2022 Mar 14

PMID 35281911

Authors

Mohamed A Salem

Shahira M Ezzat

Kawkab A Ahmed

Saleh Alseekh

Alisdair R Fernie

Reham M Essam

Affiliations

Soon will be listed here.

Abstract

Since ancient times, L. calyces have been used as a folk remedy for the treatment of hypertension. However, it is questionable as to whether there is a difference in the antihypertensive activity of the hot or cold aqueous extracts. We designed this study to specify the best method for water extraction of the antihypertensive metabolites of . and to confirm their antihypertensive capabilities The powdered dried calyces of were independently extracted with cold and hot water. A comparative study was performed between the cold and hot aqueous extracts of . based on evaluation of the renin and angiotensin-converting enzyme (ACE) inhibition activities. Additionally, both extracts were subjected to an study for the evaluation of their antihypertensive activities in L-N-Nitro arginine methyl ester (L-NAME)-induced hypertensive rats. Further, a metabolomics study was also performed for both extracts to identify their chemical constituents. The cold and hot extracts significantly reduced the angiotensin II, ACE, and aldosterone levels in the plasma. Furthermore, in the myocardium and aorta, decreased iNOS (inducible nitric oxide synthase) levels and elevated eNOS (endothelial nitric oxide synthase), as well as the rise in plasma NO levels, were reported with both extracts, but better results were displayed with the hot extract, leading to a potential antihypertensive effect. Additionally, the cold and hot extracts induced a cardioprotective effect through reducing necrosis, inflammation, and vacuolization that results from the induction of hypertension, an effect that was more prominent with the hot extract. Moreover, a comprehensive metabolomics approach using ultra-performance liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) was able to trace the metabolites in each extraction. The extracts showed different anthocyanin and phenolic compounds, but the hot extract showed higher contents of specific phenolics to which the superior antihypertensive and cardioprotective activities could be related.

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