Vascular and antioxidant effects of an aqueous Mentha cordifolia extract in experimental N(G)-nitro-L-arginine methyl ester-induced hypertension.

Abstract

The effect of an aqueous Mentha cordifolia (MC) extract on the haemodynamic status, vascular remodeling, function, and oxidative status in NG-nitro-L-arginine methyl ester (L-NAME)-induced hypertension was investigated. Male Sprague-Dawley rats were given L-NAME [50 mg/(kg body weight (BW) d)] in their drinking water for 5 weeks and were treated by intragastric administration with the MC extract [200 mg/(kgBWd)] for 2 consecutive weeks. Quercetin [25 mg/(kg BW d)] was used as a positive control. The effects of the MC extract on the haemodynamic status, thoracic aortic wall thickness, and oxidative stress markers were determined, and the vasorelaxant activity of the MC extract was tested in isolated mesenteric vascular beds in rats. Significant increases in the mean arterial pressure (MAP), heart rate (HR), hind limb vascular resistance (HVR), wall thickness, and cross-sectional area of the thoracic aorta, as well as oxidative stress markers were found in the L-NAME-treated group compared to the control (P < 0.05). MAP, HVR, wall thickness, cross-sectional area of the thoracic aorta, plasma malondialdehyde (MDA), and vascular superoxide anion production were significantly reduced in L-NAME hypersensitive rats treated with the MC extract or quercetin. Furthermore, the MC extract induced vasorelaxation in the pre-constricted mesenteric vascular bed with intact and denuded endothelium of normotensive and hypertensive rats. Our results suggest that the MC extract exhibits an antihypertensive effect via its antioxidant capacity, vasodilator property, and reduced vascular remodeling.

• Authors: Poungrat Pakdeechote, Parichat Prachaney, Warinee Berkban, Upa Kukongviriyapan, Veerapol Kukongviriyapan, Wilaiwan Khrisanapant, Yada Phirawatthakul
• Journal: Zeitschrift fur Naturforschung. C, Journal of biosciences (Z Naturforsch C J Biosci) 2014 Jan-Feb Vol. 69 Issue 1-2 Pg. 35-45 ISSN: 0939-5075 [Print] Germany
• PMID: 24772821 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antioxidants
• Plant Extracts
• NG-Nitroarginine Methyl Ester

Topics

• Animals
• Antioxidants (pharmacology, therapeutic use)
• Blood Vessels (drug effects)
• Hypertension (chemically induced, drug therapy)
• Male
• Mentha (chemistry)
• NG-Nitroarginine Methyl Ester (adverse effects)
• Plant Extracts (pharmacology, therapeutic use)
• Rats
• Rats, Sprague-Dawley