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KMID : 0620720100160020123
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Natural Product Sciences
2010 Volume.16 No. 2 p.123 ~ p.132
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Pine Needle Extracts Inhibit Contractile Responses of the Isolated Rat Aortic Strips
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Cheong Hyeon-Sook
Lim Dong-Yoon
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Abstract
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The aim of the present study was to investigate whether self-fermented pine extract for 2 years (SFPE2) and ethyl acetate (EtOAc) fraction from self-fermented pine needle extract may affect the contractility of the isolated aortic strips and blood pressure of normotensive rats. SFPE2 (360-1440 ?g/mL) significantly depressed both phenylephrine (10 ?M)-and high potassium (56 mM)-induced contractile responses of the isolated rat aortic strips in dose-dependent fashion. The EtOAc-fraction (400 ?g/mL) also inhibited both phenylephrine (10 ?M)-and high potassium (56 mM)-induced contractile responses. Also, in anesthetized normotensive rats, intravenous injection of the EtOAc fraction (1.0~10.0 mg/kg) dose-dependently elicited hypotensive responses. The EtOAc fractions (1.0 and 3.0 mg/kg/30 min) inhibited norepinehrine-induced pressor responses. Intravenous infusion of SFPE2 fraction (3.0 and 10.0 mg/kg/30 min) also inhibited norepinehrine-induced pressor responses in both anesthetized spontaneously hypertensive rats (SHRs) and normotensive rats. In conclusion, these results suggest that both SFPE2 and the EtOAc fraction cause vascular relaxation in the aortic strips isolated from normotensive rats and SHRs as well as vasodepressor responses. Based on these experimental data, it seems that SFPE2 or the EtOAc fraction possesses active antihypertensive components, which are available to prevent or treat hypertension in future.
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KEYWORD
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Pine needle extract, Vasodepressor response, Antihypertensive component
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