• Journal of Acupuncture Research
• /
• v.21 no.4
• /
• pp.1-18
• /
• 2004

Objective : This study was performed to investigate the effects of aqua-acupuncture of Jibaikjihwangtang in two-kidney one clip Goldblatt hypertensive rats and spontaneously hypertensive rats. Methods : we injected aqua-acupuncture solution into Shin-Soo ($BL_{23}$) which corresponds to human acupuncture point in two-kidney one clip Goldblatt hypertensive rats and spontaneously hypertensive rats. Systolic blood pressure, renin activity, aldosterone and atrial natriuretic peptide (ANP) plasma levels were tested. Results : Systolic blood pressure decreased significantly after aqua-acupuncture of jibaikjihwangtang. Acupuncture group in two-kidney one clip Goldblatt hyper-tensive rats had deference with control group. In plasma levels of atrial natriuretic peptide, acupuncture group of spontaneously hypertensive rats increased meaningfully but to two-kidney one clip Goldblatt hypertensive rats it was decreased meaningfully. In Serum Aldosterone density, the acupuncture group of spontaneously hypertensive rats had significant alteration than control group, but the acupuncture group of two-kidney one clip Goldblatt hypertensive rats had decreased alteration than control group. Conclusion : According to these results, after Aqua-Acupuncture of Jibaikjihwangtang blood pressure decreased significantly and data suggest that blood pressure reduction activity connected with renin activity reduction in renal hypertensive rat.

• The Journal of Internal Korean Medicine
• /
• v.31 no.1
• /
• pp.142-152
• /
• 2010

Objective : This study was done to investigate the effect of Gamioknyeo-jeon (GOJ) on spontaneously hypertensive rats. Methods : Spontaneously hypertensive rats were sensitized and challenged with GOJ for 4 weeks. the experimental group was treated with 56.7mg/kg/day of GOJ orally while the control group was treated with 56.7mg/kg/day of normal saline instead. Results : 1. GOJ significantly showed safety against cytotoxicity and toxicity in the liver. 2. GOJ significantly decreased the heart rate and the blood pressure in Spontaneously hypertensive rats. 3. GOJ significantly decreased the levels of aldosterone in Spontaneously hypertensive rats. 4. GOJ significantly decreased the levels of dopamine and norepinephrine in Spontaneously hypertensive rats. 5. GOJ significantly decreased the levels of potassium and chloride in Spontaneously hypertensive rats. 6. GOJ significantly decreased the levels of uric acid, BUN and creatinine in Spontaneously hypertensive rats. Conclusion : These results suggest that GOJ might be useful in treatment of hypertension.

• The Korean Journal of Physiology
• /
• v.19 no.2
• /
• pp.189-202
• /
• 1985

Enhanced activity of renin-angiotensin-aldosterone system has been suggested as a cause of the high blood pressure in certain forms of experimental hypertension. In spontaneously hypertensive rats, however, increased activity of the system has not been found, and even suppressed renin angiotensin system has been reported in the spontaneously hypertensive rat. In the present experiments it was attempted to explore the possible alteration of the short loop negative feedback control in the hypertensive rat. Experiments have been done in the anesthetized spontaneously hypertensive rats(SHR) as well as in normotensive Wistar and Sprague Dawley rats as control. Responses of the plasma renin activity to the intravenous L-isoproterenol were dose dependent, in both SHR and normotensive control rats. Hypotensive responses to smaller do sea of L-isoproterenol were more accentuated in SHR than in the normotensive control rats. Angiotensin If given intravenously suppressed plasma renin activity in a dose dependent fashion in both groups. However, these suppressive responses were significantly attenuated in SHR as compared with the normotensive control rats. Treatment with angiotensin I-converting enzyme inhibitor did not correct the attenuated responses of the plasma renin activity to angiotensin II in SHR. Intravenous infusion of arginine vasopressin also produced a dose-dependent suppression of plasma renin activity in both groups. The responses to arginine vasopressin were also significantly attenuated to the normotensive control rats. In the sodium-depleted SHR, arginine vasopressin did not suppress plasma renin activity, whereas the suppressive responses to arginine vasopressin in the normotensive control rats were not different from the untreated control rats. These data suggest that there may be a derangement in the short loop negative feedback control of the renin-angiotensin system in spontaneously hypertensive rat.

• Korean Journal of Pharmacognosy
• /
• v.24 no.3
• /
• pp.255-257
• /
• 1993

We investigated the effects of single administration of Korean earthworm(Lamnodrilus gotai Hatai) juice (KEJ) on blood pressure and spontaneous motor activity in spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats. We report that KEJ lowered blood pressure and spontaneous motor activity in SHR.

• The Korean Journal of Physiology
• /
• v.22 no.1
• /
• pp.41-53
• /
• 1988

The present study was undertaken to clarify the involvement of atrial natriuretic peptide in the development of hypertension in spontaneously hypertensive rats. Plasma concentration of immunoreactive atrial natriuretic peptide was higher in spontaneously hypertensive rats than in normotensive Sprague-Dawley and Wistar rats. Plasma renin concentration was lower in SHR than in normotensive rats, as observed in earlier experiments. Hydration-induced increase in urine flow and urinary excretions of sodium and potassium were smaller in SHR than in normotensive control rats. Intraarterial infusion of atrial natriuretic peptide resulted in increases in urine flow, urinary excretions of sodium and potassium in both hypertensive and normotensive rats. Renal response to atrial natriuretic peptide was markedly suppressed in SHR. Plasma renin and aldosterone concentration were suppressed by atrial natriuretic peptide in both SHR and normotensive rats. The responses were not significantly different in both groups. These results suggest that the renal responsiveness to atrial natriuretic peptide may be suppressed in SHR by some mechanisms still remaining obscure.

• The Journal of Korean Medicine
• /
• v.19 no.2
• /
• pp.50-58
• /
• 1998

The effects of the Evodiae fructus on the cardiovascular function were assessed in spontaneously hypertensive rats, and isolated preparation of spontaneously hypertensive rats aortic strip. In spontaneously hypertensive rats, intraperitoneal administration of methanol crude extract of Evodiae Fructus (0.5mg/kg) lowered aterial blood pressure which lasted for at least 4 hours. The hypotensive effect of Evodiae Fructus was more stronger with ${\alpha}-adrenoreceptor$ inhibitor(Phentholamine) and it was not affected by ${\beta}-adrenoreceptor$ inhibitor(Propranolol). The hypotensive effect of Evodiae Fructus was abolished by NAME. It is suggested that the hypotensive effect of Evodiae Fructus may be concern with endothelium-derived relaxing factor and it may be mediated through NO synthesis. Evodiae Fructus showed a vasorelaxing effect on denude aortic strip. It is suggested that Evodiae Fructus has a direct relaxing effect on vascular smooth muscle cells. Judging from above results, it was proved that hypotensive effect of Evodiae Fructus. The mechanism of hypotensive action may be concern with endothelium-derived relaxing factor and direct relaxing effect on vascular smooth muscle cells. Therefore, it is suggested that Evodiae Fructus is applicable to hypertension.

• Herbal Formula Science
• /
• v.30 no.3
• /
• pp.123-135
• /
• 2022

Oryeongsan (ORS), a formula composed of five herbal medicines, has long been used to treat impairments of the regulation of body fluid homeostasis. The purpose of this study was to determine the antihypertensive and renal protective effects of ORS in rats with hypertension. Spontaneously hypertensive rats (SHR) were divided into two groups with similar mean baseline systolic blood pressure (SBP). Then, 1 mL/kg of vehicle (distilled water) or 1.5, 3 g/kg of ORS extract were administered orally once a day for 4 weeks. SBP and diastolic blood pressure (DBP) were measured at weeks 1, 2, 3 and 4. At the end of the experiment, blood was collected, and heart were removed for histology. By the 2 weeks after initiation of treatment, the ORS treated group had significantly lower SBP than SHR rats. The ORS treatment significantly improved blood pressure and echocardiogram parameters compared to hypertensive rats. Additionally, the left ventricular (LV) remodeling and LV dysfunction were significantly improved in ORS treated group hypertensive rats. Furthermore, an increase in fibrotic area has been observed in SHR rats compared with Wistar-Kyoto rats (WKY). Furthermore, administration of ORS significantly attenuated cardiac fibrosis in hypertensive rats. Therefore, these findings suggest that ORS has a protective effect on heart failure by alleviating hypertensive heart disease and cardiovascular dysfunction in SHR.

• Food Science of Animal Resources
• /
• v.44 no.1
• /
• pp.178-188
• /
• 2024

The aim of this study is to investigate whether milk fermented by Lactiplantibacillus plantarum K79, which exhibits angiotensin-converting enzyme inhibitory activity, has an effect on lowering the blood pressure of hypertensive rats and to investigate biomarker changes in their blood. Experimental group: normal group (NG, Wistar-Kyoto rats): distilled water, control group [NCG, spontaneously hypertensive rats (SHR)]: distilled water, high treatment group (HTG, SHR): 500 mg/kg/day, medium treatment group (SHR): 335 mg/kg/day, low treatment group (SHR): 170 mg/kg/day, positive control group (PCG, SHR): Enalapril, 10 mg/kg/day. The experimental animals used in this study were divided into groups composed of 8 animals. In terms of weight change, a significant difference was observed between the NG and the SHR group, but there was no significant difference between the SHR group. After 8 wk of feeding, blood pressure was lowered more significantly in the HTG (209.9±13.3 mmHg) than in the NCG (230.8±7.3 mmHg). The treatment group has an effect of lowering blood pressure by significantly suppressing blood pressure-related biomarker protein expression than NG. The results obtained can be used as an antihypertensive material in a variety of food raw materials.

• Journal of Nutrition and Health
• /
• v.37 no.7
• /
• pp.509-514
• /
• 2004

This study was conducted to investigate the supplementary effects of Lentinus edodes on blood pressure and blood lipid levels in the Hypertensive Rat. We supplied 3 kinds of experimental diets (Control; CO, cap of Lentinus edodes; LC, and stipe of Lentinus edodes; LS) to spontaneously hypertensive rats (SHR) for 8 weeks. Diet intake, body weight, organ weights, and serum lipid levels were measured. There was no significant difference in diet intake, and body, liver and epididymal fat pad weights among experimental groups. The levels of systolic and diastolic blood pressure were significantly lower in LC and LS groups than CO group. The concentrations of serum total cholesterol were lower in LC and LS groups than CO group. These results suggested that Lentinus edodes decrease blood pressure levels and serum total cholesterol concentration in the spontaneously hypertensive rats. But these effects of Lentinus edodes didn't show any significant difference between animals fed cap and stipe of this mushroom.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 2009.05a
• /
• pp.97-100
• /
• 2009

The purpose of this study was to examine effects of treadmill running training on superoxide product of spontaneously hypertensive rats. 20 males aged five week old rats were used for the experiments. They were randomly selected into experimental group (10 rats) and control group (10 rats) after being housed in laboratory for two weeks. The rats of experimental group performed treadmill exercise from 15 minutes for the first time to 35 minutes for the last one in order to familiar with experimental protocol ($VO_{2}max\;65{\sim}70%$, 0.9km/h, 5 times/week, 35 minutes/session). They began to perform treadmill running at the age of eight weeks for eight weeks. Superoxide production and NADPH oxidase activities were measured on the aortal from end of experiment. All statistical analyses and description methods were computed by SPSS Version 10.0. Differences in the values between experimental group and control group were calculated using t-tests. The results of this study were: there wewe no significant differences in superoxide production, NADPH oxidase-drivened superoxide activity, NADPH oxidase activity between two groups (p>.05). Spontaneously hypertensive rats of experimental group were characterized by higher superoxide production and lower NADPH oxidase-drivened superoxide activity and NADPH oxidase activity in comparison with the control group. One possible explanation of this finding was that NADPH oxidase activity of experimental group was lower than the control group. It can be concluded that treadmill running for eight weeks was associated positively with superoxide product of spontaneously hypertensive rats.