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Pakistan Journal of Biological Sciences
  Year: 2008 | Volume: 11 | Issue: 12 | Page No.: 1569-1575
DOI: 10.3923/pjbs.2008.1569.1575
 
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Vasorelaxant and Hypotensive Effects of Allium cepa Peel Hydroalcoholic Extract in Rat
Mohammad Kazem Gharib Naseri, Maedeh Arabian, Mohammad Badavi and Akram Ahangarpour

Abstract:
The aim of present study was to investigate the effect of onion (Allium cepa) peel hydroalcoholic extract (OPE) on rat hypertension induced by high-fructose diet and aorta contractility. The OPE was prepared by maceration method using 70% ethanol. The thoracic aorta from male adult rat (Wistar) was dissected and suspended in Krebs-Henseleit solution under 1 g resting tension. Tissue preparation was contracted by KCl (80 mM) or phenylephrine (Phe, 1 μ M) and then the extract was applied cumulatively (0.0625-2 mg mL-1). Hypertension was induced in negative control and three groups of rats by adding fructose (10% W/V) in drinking water for 6 weeks but control group received tap water. Hypertensive groups received saline or OPE at 200, 400 and 800 mg kg-1 daily for last 3 weeks by gavage. Results showed that OPE reduces aorta contractions induced by KCl or Phe in a concentration-dependent manner (p<0.001). Removing aorta endothelium did not attenuate the OPE activity. Inhibition of nitric oxide, cGMP and prostaglandin synthesis by L-NAME (100 μM), methylene blue (10 μM) and indomethacin (10 μM), respectively, did not attenuate OPE activity. Atropine abolished ACh-induced relaxation in Phe precontracted aorta but not the OPE-induced relaxation. Although the extract did not change heart rate but after 3 weeks reduced the hypertension induced by fructose (p<0.001). Present results indicated that OPE reduces aortic contractions possibly via inhibition of calcium influx but without involving NO, cGMP, endothelium and prostaglandins. The OPE hypotensive effect could be due to extract quercetin content, antioxidant activity and inhibiting vascular smooth muscle cells Ca2+ influx.
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How to cite this article:

Mohammad Kazem Gharib Naseri, Maedeh Arabian, Mohammad Badavi and Akram Ahangarpour, 2008. Vasorelaxant and Hypotensive Effects of Allium cepa Peel Hydroalcoholic Extract in Rat. Pakistan Journal of Biological Sciences, 11: 1569-1575.

DOI: 10.3923/pjbs.2008.1569.1575

URL: https://scialert.net/abstract/?doi=pjbs.2008.1569.1575

 
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