Journal of the Korea Academia-Industrial cooperation Society
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v.17
no.11
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pp.708-715
/
2016
This study examined the effects of an extract of Dendropanax morbifera on blood pressure, Angiotensin II, Angiotensin Converting Enzyme, Aldosterone, and lipid levels of spontaneously hypertensive rats. The groups were as follows: Control group, Hypertension control group, Water extract treated group, Ethanol extract treated group, n- hexane fraction treated group, Ethyl acetate fraction treated group, n- butanol fraction treated group, and Water fraction treated group. The blood pressure, and Angiotensin II, and Angiotensin Converting Enzyme, and Aldosterone levels were lower in the Ethyl acetate fraction treated group than in the hypertension control group. The change in blood pressure was lower in the Water extract treated group, Ethyl acetate fraction treated group, Ethanol extract treated group, n- hexane fraction treated group, and n- butanol fraction treated group than the hypertension control group. The concentration of Angiotensin II was lower in the Ethyl acetate fraction treated group, Ethanol extract treated group, n- hexane fraction treated group, and n- butanol fraction treated group than the hypertension control group(p<0.05). The level of Angiotensin Converting Enzyme was lower in the Ethyl acetate fraction treated group, Ethanol extract treated group, n- hexane fraction treated group, and n- butanol fraction treated group than the hypertension control group. The concentration of Aldosterone was lower in the Ethyl acetate fraction treated group, and n- butanol fraction treated group than the hypertension control group(p<0.05). In addition, the concentration lower in the Water extract treated group, Ethanol extract treated group, n- hexane fraction treated group than the hypertension control group. Overall, the effect of the Dendropanax morbifera extracts might be useful as anti-hypertensive, and functional food agents.
It is well known that angiotensin converting enzyme inhibitors(ACEIs) increase endothelium-dependent relaxation in aortic strips of spontaneously hypertensive rats(SHR) and this increase in relaxation may be due to altered endothelial nitric oxide breakdown. But there are few studies on the effect of the angiotensin II receptor blocker on the nitric oxide-mediated relaxation. So we attempted to investigate the effect of angiotensin II receptor blocker on the nitric oxide-dependent relaxation in isolated aorta of SHR. Two week-treatment of losartan (30 mg/kg/day) increased the acetylcholine$(10^{-9}\;to\;10^{-5}\;M)$-and histamine$(10^{-8}\;to\;10^{-4}\;M)$-induced relaxation in endothelium intact strips but 90 minutes-treatment of losartan $(10^{-4}\;M)$ showed no increase in relaxation. The phenylephrine $(10^{-7}\;M)$-induced contraction, repeated every 2 hours, was diminished gradually following lipopolysaccharide (LPS)-treatment $(100\;{\mu}g/ml)$ but there was no significant difference in enalapril- and losartan-treated group compared with control group. These results suggest that activity of the endothelial constitutive NO synthase may be changed by chronic treatment of angiotensin II receptor blockers and ACEIs but angiotensin II antagonist and ACEI have no effect on the inducible NO synthase activity in the isolated aorta of SHR
Journal of the Korean Society of Food Science and Nutrition
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v.32
no.6
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pp.899-905
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2003
The effects of cooked soybean and a traditional fermented soy product, chongkukjang, on blood pressure and lipid metabolism were studied in spontaneously hypertensive rat (SHR). SHRs were divided into 3 groups (n=10, male), and fed casein, powders of cooked soybean, and chongkukjang as dietary protein sources for 6 weeks. Body weight gain was not different among experimental groups, but food efficiency was increased in groups fed cooked soybean and chongkukjang diets compared to control group. Consumption of cooked soybean and chongkukjang for 6 weeks in SHR significantly suppressed blood pressure rise with aging (p<0.05). Feeding of cooked soybean and chongkukjang to SHR decreased plasma triacylglycerols (p<0.05) by 21.6% and 30.2% and LDL-cholesterol by 30.0% and 27.5%, respectively. Addition of cooked soybean and chongkukjang to the diet resulted in reduction of total lipids and triacylglycerols of liver, while consumption of cooked soybean and chongkukjang resulted in the increase of fecal cholesterol and bile acid excretions, respectively (p<0.05). Cooked soybean and chongkukjang diets down-regulated the activity of hepatic HMG-CoA reductase by 56.4% and 94.5%, compared to control, respectively. From the above-mentioned results, it can be concluded that consumption of cooked soybean and chongkukjang might be helpful in preventing cardiovascular disease by suppressing blood pressure rise and hyperlipidemia.
The purpose of this study is to investigate the combined effect of L-arginine supplementation and regular physical exercise on HR, BP, eNOS and Macrophage activation using SHR. To examine the differences among HR, BP, eNOS, and Macrophage activity levels, normotensive Wistar-Kyoto rats were used as a control. Thirty two male rats (six weeks old) were divided into four groups; eight WKY control (WKYC), eight SHR control (SHRC), eight SHR supplemented with L-arginine (SHRA), and eight SHR trained and supplemented with L-arginine (SHRTA). Obtained results were as follows : In the heart and blood pressure, there was significant differences anong the four group (p<.05) compare to SHRC. In the eNOS levels, there was significant differences among the four groups (p<.05) compare to SHRC. In the macrophage activity, there was significant differences among the four groups (p<.05) compare to SHRC. In conclusion, For the SHRC group, the level of eNOS is higher than that of WKYC, and we can expect tissue damage caused by toxic free radical. However, this can be stabilized by the L-arginine supplementation and regular physical training. we can also conclude regular aerobic training decrease cardiovascular stress caused by stabled macrophage activity. Therefore, we can trace it is the effect of training in SHR.
The aim of the present study was to investigate the effect of Hwangryeonheadock-Tang and Onchung-Eum on essential hypertension and hyperlipidemia. Rats were orally administered for 30days with Hwangryeonheadock-Tang and Onchung-Eum and the blood was withdrawn at 10, 20 and 30days after an oral administration. The heart rate, tail blood pressure, plasma renin activity, plasma level of aldosterone. catecholamine, sodium and angiotensin II were measured after an oral administration of Hwangryeonheadock-Tang and Onchung-Eum in spontaneously hypertensive rat(SHR). In addition, serum levels of total cholesterol, triglyceride, HDL-cholesterol. LDL-cholesterol and total lipid were measured cholesterol-fed rats. The results were summarized as follows ; 1. A significant decrease of tail blood pressure was shown at 10, 20 and 30days after Hwangryeonheadock-Tang and Onchung-Eum treatment in SHRs. compared with saline. 2. Heart rate was significantly decreased at 30days in SHRs after Hwangryeonheadock-Tang treatment and at 20, 30days after Onchung-Eum treatment in SHRs. compared with the effects of saline group. 3, A significant decrease of plasma aldosterone level was elicited at 10, 20days after Hwangryeonheadock-Tang treatment in SHRs, compared with the effects of saline group, 4. Plasma renin activity was significantly decreased at 10days after Onchung-Eum treatment compared with the effects of saline group in SHRs. 5. Plasma norepinephrine level was significantly decreased at 20 and 30clays after Onchung-Eum treatment in SHRs, compared with the effects of saline group. 6. A significant decrease of plasma epinephrine level was induced at 30days after Hwangryeonheadock-Tang treatment and at 10, 20 and 30days after Onchung-Eum treatment, compared with the effects of saline group in SHRs. 7. Plasma sodium level was. significantly decreased at 20days after Hwangryeonheadock-Tang and Onchung-Eum treatment, compared with the effects of saline group in SHRs. 8. Plasma angiotensin II level was significantly decreased at 30days after Onchung-Eum treatment, compared with the effects of saline group in SHRs. 9. A significant decrease of body weight was observed at 20 and 30days after Hwangryeonheadock-Tang treatment and at 10, 20 and 30days after Onchung-Eum treatment. compared with the effects of saline group in hyperlipidemia rats. 10. Hwangryeonheadock-Tang and Onchung-Eum showed a significantly decreasing effect at 30days on serum total cholesterol level in hyperlipidemia rats, compared with the saline treatment. 11. Hwangryeonheadock-Tang and Onchung-Eum saw 20 and 30days respectively on serum triglyceride level in the saline treatment. 12. Hwangryeonheadock-Tang and Onchung-Eum decreased on serum HDL-cholesterol level significantly, compared with the saline treatment in hyperlipidemia rats. 13. A significant decrease of serum LDL-cholesterol was observed at 10 and 30days after Hwangryeonheadock-Tang treatment and at 30days after Onchung-Eum treatment, compared with the effects of saline group in hyperlipidemia rats. 14. Hwangryeonheadock-Tang had a significantly decreasing effect at 10, 20 and 30days on serum total lipid level, compared with the saline treatment in hyperlipidemia rats. 15. Hwangryeonheadock-Tang elicited a significantly decreasing effect on weight of kidneys, spleen and testes respectively and Onchung-Eum induced on weight of liver and spleen respectively in hyperlipidemia rats, compared with saline treatment. These Findings suggest a possible anti-hypertensive and anti-hyperlipidemic effect of Hwangryeonheadock-Tang and Onchung-Eum.
Effects of a voltage dependent calcium channel antagonist, nifedipine, on the responses of blood pressure, and secretion of atrial natriuretic peptide (ANP) and aldosterone to angiotensin II (Ang II) were compared in male Wistar and spontaneously hypertensive rats (SHR). A low, control or high sodium diet (2, 10 or 25 mmol Na/100 g diet) was fed for 6 weeks from the age of 6 weeks. On the morning of the experiment catheters were inserted under ether anesthesia in the femoral artery for pressure recording and blood sampling, and in the femoral vein for drug infusion. Ang II was infused at a rate of 250 ng/kg/min for 20 min. Nifedipine mixed with Ang II was infused at a rate of $16{\mu}g/kg/min$ for 20 min. Arterial blood samples were collected before and after infusion of Ang II with or without nifedipine. The control plasma level of aldosterone was inversely related to the amount of salt intake, whereas the plasma ANP level was not different between the salt groups. SHR showed a higher basal plasma ANP but a lower aldosterone concentration than Wistar rats. Infusion of Ang II produced a significant increase in blood pressure and plasma levels of aldosterone and ANP: The % increase was not significantly different either between the salt groups or between SHR and Wistar rats. SHR showed a greater pressor response to Ang II but a remarkably smaller decrease in heart rate after Ang II infusion than Wistar rats, With increasing sodium intake, the effect of Ang II on aldosterone secretion was decreased, whereas that on ANP secretion or blood pressure was not changed. Nifedipine decreased the responses of blood pressure and heart rate to Ang II in all groups. Nifedipine caused almost a complete inhibition of Ang II induced ANP secretion, but only a partial inhibition of Ang II induced aldosterone secretion or vasoconstriction. These results indicate that calcium dependent processes were involved in Ang II induced vasoconstriction, and secretions of aldosterone and ANP. However, the calcium dependent process far ANP secretion was considerably different from that for aldosterone secretion or vasoconstriction evoked by ang II. The ang II induced increase in ANP secretion appeared to be caused primarily by activating voltage-dependent calcium channels, whereas Ang II induced aldosterone secretion and vasoconstriction was not.
The purpose of this study is to investigate hypotensive effect of BDR-29, new herbal preparation of Cassiae Semen, Prunellae Spica, Uncariae Ramulus et Uncus, and Tribuli Semen, in stroke-prone spontaneously hypertensive rats (SHR-SP). SHR-SP were treated with BDR-29 at a dose of 100, 200 mg/kg/day orally for 13 weeks. In the BDR-29 treat group, mean blood pressure and systolic blood pressure were significantly reduced (p<0.05). In phenylephrine-precontracted arota and carotid artery, BDR-29 induced endothelium-dependent vascular relaxation. Hematological findings and biochemical examination revealed no evidence of specific toxicity related to BDR-29. In addition, BDR-29 was markedly attenuated intima-media thickness of thoracic aorta with progression of atherosclerosis. SHR-SP were treated with BDR-29 were significantly increased eNOS expression in arota. These results indicated that BDR-29 improves blood pressure as well as initial atherosclerotic lesion.
Lee, Kyung Hee;Bae, In Young;Park, Song I.;Park, Jong-Dae;Lee, Hyeon Gyu
Journal of Ginseng Research
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v.40
no.3
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pp.237-244
/
2016
Background: Ginsenoside Rg3 and arginine-fructose (Arg-Fru) are known as the hypotensive compounds of Panax ginseng; however, their efficacy on antihypertension has not been reported yet to our best knowledge. Thus, hypotensive components-enriched fraction of red ginseng (HCEF-RG) was prepared from fine root concentrate (FR) and their antihypertensive effects were investigated in spontaneously hypertensive rats (SHR). Methods: Male SHRs were divided into six groups: control (Wistar Kyoto, SHR); FR 500; FR 1,000; HCEF-RG 500; and HCEF-RG 1,000; samples (mg/kg body weight) were orally administered every day for 8 wk. Blood pressure was monitored at 1 wk, 2 wk, 3 wk, 4 wk, 6 wk, and 8 wk by tail cuff method. At 8 wk after samples administration, mice were killed for the measurement of renin activity (RA), angiotensin-I converting enzyme inhibition, angiotensin II, and nitric oxide (NO) levels in plasma. Results: HCEF-RG with four-fold more Rg3 and 24-fold more Arg-Fru contents was successfully prepared from reacted mixtures of FR and persimmon vinegar (12 times against FR, v/v) at $80^{\circ}C$ for 18 h. Both FR 1,000 and HCEF-RG 1,000 showed lowered systolic blood pressure than SHR control group and HCEF-RG 1,000 group exhibited a significant decrease in diastolic blood pressure. RA was significantly lowered in all treated groups, while angiotensin II did not affect by FR and HCEF-RG treatment. However, angiotensin-I converting enzyme inhibition and NO in FR 1,000 and HCEF-RG 1,000 were significantly increased compared with SHR control group. Conclusion: HCEF-RG is more effective and useful for alleviating hypertension than FR, implying the health benefit of Rg3 and Arg-Fru.
Kim, Yong-Suk;Kim, Jong-In;Kim, Chang-Hwan;Yoo, Jin-Hwa;Huh, Young-Buhm
Journal of Acupuncture Research
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v.22
no.2
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pp.13-18
/
2005
This study was undertaken to investigate the effects of electroacupuncture(EA) on Choksamni(ST36), a well-known acupuncture site, on nicotinamide adenine dinucleotide phosphate-diaphorase(NADPH-d), neuropeptide Y(NPY) and vasoactive intestinal peptide(VIP) in the cerebral cortex of spontaneously hypertensive rats(SHR). EA on Choksamni was applied using 2Hz electrical biphasic pulses of 10min, 3 times a week for a total of 10 sessions. Thereafter we evaluated changes in NADPH-d-positive neurons histochemically and changes in NPY and VIP-positive neurons immunohistochemically. The optical density of NADPH-d-positive neurons in the Choksamni group was significantly lower in all areas of the cerebral cortex than in the control group. However, the optical density of NPY-positive neurons in the Choksamni group was similar to that of the controls in most areas of the cerebral cortex, with the exception of the primary motor and visual cortices. The optical density of VIP-positive neurons in the Choksamni group was significantly decreased as compared to the control group in most areas of the cerebral cortex, with the exception of the cingulate cortex. The present results demonstrated that EA on Choksamni changes the activity of the NO system, and that stimulation at the same level, causes selective changes within the peptidergic system in the cerebral cortex of SHR.
Kim, Jung-Suk;Kim, Mi-Jeong;Park, Min-Hee;Ryu, Bog-Mi;Moon, Gap-Soon
Journal of the Korean Society of Food Science and Nutrition
/
v.37
no.1
/
pp.27-34
/
2008
This study investigated the anti-hypertensive effect of Phyllostachys pubescens culm extract (PCE) by examining its effects on renal angiotensin-converting enzyme (ACE) inhibition and blood pressure using the spontaneously hypertensive rat (SHR) system. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were measured weekly for 8 weeks. Also, total antioxidant capacity and protein oxidation of tissues were examined by plasma Trolox Equivalent Antioxidant Capacity assay (TEAC) and hepatic protein carbonyl values, respectively. Twenty male SHR were randomly divided into four groups: PCE50, PCE100, and PCE500 (50, 100, and 500 mg of PCE per kilogram bodyweight daily, respectively), and control group. At week 2, the SBP in all PCE groups appeared to be significantly lower than the control (p<0.05), whereas the DBP were not different until week 4 (p<0.05). At week 8, SBP in the PCE500 was lower by 20% than the control. PCE groups considerably suppressed ACE dose-dependently compared with the control. Plasma TEAC and hepatic protein carbonyl values indicated increased antioxidative activity due to the PCE feed. No adverse effect was observed on the liver of SHR as there was no difference for the GOT and GPT values among the groups. Results of this study suggest that ACE inhibition may be one possible mechanism for the blood pressure lowering effect of PCE; thus, long term consumption of PCE may be beneficial in preventing high blood pressure along with the increased antioxidative status.
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