Root essential oil of Chrysopogon zizanioides relaxes rat isolated thoracic aorta – an ex vivo approach

Author:

Sivakumar Lekha1,Chellappan David Raj2ORCID,Sriramavaratharajan Venkatraman2ORCID,Murugan Ramar3ORCID

Affiliation:

1. School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613 401 , Tamil Nadu , India

2. Central Animal Facility, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613 401 , Tamil Nadu , India

3. Centre for Research and Postgraduate Studies in Botany , Ayya Nadar Janaki Ammal College (Autonomous) , Sivakasi 626 124 , Tamil Nadu , India

Abstract

Abstract Root of Chrysopogon zizanioides (L.) Roberty has been used in Siddha system of medicine to treat hypertension. The present study was therefore to investigate the vasorelaxation effect of root essential oil of C. zizanioides using rat isolated thoracic aortic rings. Chemical characterization of root essential oil was carried out using Gas Chromatography–Flame Ionization Detector (GC–FID) and Gas Chromatography–Mass Spectrometry (GC–MS). Essential oil nanoemulsion (EONE) was prepared and characterized. Vasorelaxant effect of EONE in endothelium-intact aortic rings precontracted with phenylephrine (PE) (1 µM) or KCl (80 mM) was investigated. Role of Ca2+, nitric oxide and K+ channels in precontracted aortic rings were investigated to elucidate the mechanism of action of the essential oil. Further, the role of muscarinic and prostacyclin receptors in EONE induced relaxation was studied. The EONE significantly induced relaxation (Emax 77.1 ± 4.87%) in PE precontracted aortic rings. The nitric oxide synthase, and cyclooxygenase inhibitors and potassium channel blockers have not significantly inhibited the vasorelaxation induced by EONE. However, EONE induced relaxation in precontracted endothelium-intact aortic rings was significantly inhibited by muscarinic receptor and calcium channel. The root essential oil of C. zizanioides possesses vasorelaxant effect through muscarinic pathway as well as acts as calcium channel blocker.

Publisher

Walter de Gruyter GmbH

Subject

General Biochemistry, Genetics and Molecular Biology

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