Systemic arterial blood pressure responses of stroke-prone spontaneously hypertensive rats to treadmill exercise

The present study was undertaken to compare the systemic blood pressure responses during graded acute exercise of stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive Wistar-Kyoto rats (WKY). Systemic blood pressure was measured by left carotid artery catheter during exercise. Systolic blood pressure incre-ments with running exercises at 10, 15, and 20 m/min were significantly greater in SHRSP than in WKY. Diastolic blood pressure increments with exercise were singnificantly greater only at 20 m/min in SHRSP compared to WKY. This study suggests that the blood pressure response to exercise is accentuated in SHRSP.     

Black and green tea polyphenols attenuate blood pressure increases in stroke-prone spontaneously hypertensive rats

Oxidative stress was reported to be involved not only in cardiovascular diseases, but also in hypertension. Epidemiologic studies indicated that tea consumption slightly reduces blood pressure. We conducted two studies to determine whether black and green tea can lower blood pressure (BP) in stroke-prone spontaneously hypertensive rats (SHRSP). Male SHRSP (n=15) were allowed to recover for 2 wk after a transmitter for measuring BP was implanted in the peritoneal cavity. The rats were divided into three groups: the control group consumed tap water (30 mL/d); the black tea polyphenol group (BTP) consumed water containing 3.5 g/L thearubigins, 0.6 g/L theaflavins, 0.5 g/L flavonols and 0.4 g/L catechins; and the green tea polyphenol group (GTP) consumed water containing 3.5 g/L catechins, 0.5 g/L flavonols and 1 g/L polymetric flavonoids. The telemetry system was used to measure BP, which were recorded continuously every 5 min for 24 h. During the daytime, systolic and diastolic BP were significantly lower in the BTP and GTP groups than in the controls. Protein expressions of catalase and phosphorylated myosin light chain (MLC-p) were measured in the aorta by Western blotting. GTP significantly increased catalase expression, and BTP and GTP significantly decreased MLC-p expression in the aorta. These data demonstrate that both black and green tea polyphenols attenuate blood pressure increases through their antioxidant properties in SHRSP. Furthermore, because the amounts of polyphenols used in this experiment correspond to those in approximately 1 L of tea, the regular consumption of black and green tea may also provide some protection against hypertension in humans.     

Regulation of blood pressure and glucose metabolism induced by L-tryptophan in stroke-prone spontaneously hypertensive rats

Background

Amino acids have been reported to act as modulators of various regulatory processes and to provide new therapeutic applications for either the prevention or treatment of metabolic disorders. The purpose of the present study is to investigate the effects of single oral dose administration and a continuous treatment of L-tryptophan (L-Trp) on the regulation of blood pressure and glucose metabolism in stroke-prone spontaneously hypertensive rats (SHRSP).

Methods

First, male 9-week-old SHRSP were administered 100 mg L-Trp·kg^-1 body weight in saline to the L-Trp group and 0.9% saline to the control group via a gastric tube as a single oral dose of L-Trp. Second, three groups of SHRSP were fed an AIN-93M-based diet supplemented with L-tryptophan (L-Trp) (0, 200, or 1000 mg·kg^-1 diet) for 3 weeks as continuous treatment of L-Trp.

Results

Single oral dose administration of L-Trp improved blood pressure, blood glucose, and insulin levels. Blood pressure, blood glucose, and insulin levels improved significantly in the L-Trp treatment groups. The administration of L-Trp also significantly increased plasma nitric oxide and serotonin levels.

Conclusion

L-Trp by both single oral dose administration and continuous treatment improves glucose metabolism and blood pressure in SHRSP.     

Antihypertensive effect of biotin in stroke-prone spontaneously hypertensive rats

Biotin is a member of the vitamin B-complex family. Biotin deficiency has been associated with hyperglycaemia and insulin resistance in animals and humans. In the present study, we investigated the pharmacological effects of biotin on hypertension in the stroke-prone spontaneously hypertensive rat (SHRSP) strain. We observed that long-term administration of biotin decreased systolic blood pressure in the SHRSP strain; also, a single dose of biotin immediately decreased systolic blood pressure in this strain. Pretreatment with the guanylate cyclase inhibitor 1H-[1,2,4]oxadiazole [4,3-alpha]quinoxalin-1-one abolished the hypotensive action of biotin in the SHRSP strain, while pretreatment with the NO synthase inhibitor NG-nitro-l-arginine methyl ester had no effect on the action of biotin. Biotin reduced coronary arterial thickening and the incidence of stroke in the SHRSP strain. These results suggest that the pharmacological dose of biotin decreased the blood pressure of the SHRSP via an NO-independent direct activation of soluble guanylate cyclase. Our findings reveal the beneficial effects of biotin on hypertension and the incidence of stroke.     

Astaxanthin inhibits thrombosis in cerebral vessels of stroke-prone spontaneously hypertensive rats

It is known that vitamin E and some carotenoids have antioxidant activities that alleviate endothelial dysfunction and play a protective role against cardiovascular disease. The current study was designed to examine the hypothesis that astaxanthin, a red pigment carotenoid found in salmonid and crustacean aquaculture, protects stroke-prone spontaneously hypertensive rats (SHRSP) from vascular oxidative damage, hypertension, and cerebral thrombosis. Male 6-week-old SHRSP were classified into 4 groups: a control group, 2 astaxanthin groups, and a vitamin E group. The treated animals were given either astaxanthin or vitamin E for 3 weeks. Body weights in each group were not significantly different from control group during the treatment period, but the usual increase in systolic blood pressure in SHRSP observed with age was significantly suppressed by treatment. Thrombogenesis, assessed using a helium-neon (He-Ne) laser technique in pial blood vessels, together with antioxidant activity, assessed by measuring urinary 8-OHdG levels, were significantly moderated. Urinary nitric oxide (NO) metabolites were increased after treatment. These results supported our hypothesis and strongly suggested that the antithrombotic and antihypertensive effects of astaxanthin or vitamin E may be related to an increase in bioavailable NO, possibly mediated by decreased inactivation of NO by reactive oxygen species.     

Vascular changes involved in pulmonary hemorrhage of stroke-prone spontaneously hypertensive rats

The frequency of pulmonary hemorrhagic lesions in stroke-prone spontaneously hypertensive rats (SHRSP) was higher in older than in younger rats. Hemoglobin and protein contents in pulmonary lavage fluid which may indicate alveolar hemorrhage showed an increase with the progress of age, but the difference of hemorrhagic levels was much more in older rats than that of younger ones. A strong relationship between hemoglobin and protein contents of pulmonary lavage fluid was observed. Morphologically, the most striking feature was fibrinoid degeneration of the vascular walls in the center of hemorrhagic lesions of the lung, not only in the capillaries but also in small arteries. In the early stage of hemorrhage, endothelial discontinuity exhibited intraluminal fibrin deposits in this area of the vessels. Erythrocytes and polygonal deposits of fibrin could also be seen within the same vascular walls. In the advanced stage, subendothelial spaces and medial layers of vascular walls contained an electron-dense amorphous material which was consisted to be a degradation product of fibrinogen. The occurrence of this substance was thought to be induced by the hemodynamic effects of hypertension, the results of increased permeability and the accumulation of blood components. From these results, we suggest that fibrinoid degeneration due to abnormal cellular permeability associated with hypertension in SHRSP may be in some way linked to the development of pulmonary hemorrhage.     

Effect of chlorella and its fractions on blood pressure, cerebral stroke lesions, and life-span in stroke-prone spontaneously hypertensive rats

Effects of Chlorella regularis (dried cell powder)--cultured axenically under heterotrophic conditions, and provided as a dietary supplement--and its fractions on the blood pressure, cerebral stroke lesions, and life-span of stroke-prone spontaneously hypertensive rats (SHRSP/Izm) were investigated. When SHRSP were fed on diets with supplemented Chlorella to a commercial diet (Funabashi SP), elevation of blood pressure was significantly lower in the Chlorella groups than in the control group. At 21 wk of feeding, serum total cholesterol was significantly lower in the Chlorella groups than in the control group. Histopathological examination revealed cerebral vascular accidents in the brains of the control group, but those of Chlorella groups showed apparently low incidence compared to the control group. The average life-span of the Chlorella groups were significantly longer than that of the control group (p < 0.001). Chlorella powder was fractionated into three fractions, lipid-soluble, hot water-soluble, and residual fractions. The diets supplemented with lipid or residual fractions equivalent to 10% Chlorella significantly suppressed elevation of blood pressure in SHRSP, and then decreased the incidence rate of cerebral vessel lesions compared to the control group. Chemical analysis revealed that the lipid fraction contained large quantities of antioxidants, including carotenoids (especially lutein) and others, and phospholipids involved in aorta collagen and elastin metabolism; the residual fraction contained high concentrations of arginine, enhancing the function of blood vessels. The control diet contained only a little these substances. These experimental results suggest that the beneficial effect of Chlorella on SHRSP is caused by the synergistic action of several ingredients of Chlorella, which play a role in sustention of a vascular function of rats.     

Resveratrol attenuates ovariectomy-induced hypertension and bone loss in stroke-prone spontaneously hypertensive rats

We examined the effect of resveratrol (3,4',5-trihydroxy stilbene), a phenolic compound found in the skins of most grapes, on blood pressure and bone loss in ovariectomized (OVX), stroke-prone spontaneously hypertensive rats (SHRSP). Nineteen-week-old female SHRSP were divided into a sham-ovariectomized (sham) group fed a control diet and two OVX groups fed either a control diet (OVX-Cont) or a diet supplemented with resveratrol (5 mg/kg per d; OVX-Resv). Ovariectomy induced significant increases in systolic blood pressure (SBP). Resveratrol lowered the SBP by 15%) by the third week of administration, and this effect was maintained throughout the study. Resveratrol treatment also significantly enhanced endothelium-dependent vascular relaxation in response to acetylcholine (ACh) in OVX rats. Finally, femur breaking energies measured for the resveratrol-treated (OVX-Resv) group were significantly higher than those of the resveratrol-untreated (OVX-Cont) group. While no significant differences in calcium, magnesium and phosphorus content were found between the femurs of OVX-Cont and OVX-Resv rats, the femur hydroxyproline content in the OVX-Resv group was significantly higher than of the OVX-Cont group. We conclude that, in OVX-SHRSP, resveratrol acts by a similar mechanism to mammalian estrogens, lowering blood pressure by increasing dilatory responses to ACh. The present study also demonstrated that resveratrol was able to prevent ovariectomy-induced decreases in femoral bone strength.     

Dietary mushrooms reduce blood pressure in spontaneously hypertensive rats (SHR)

The blood pressure of spontaneously hypertensive rats (SHR) were significantly reduced by Maitake feeding for 8 weeks period beginning at a time when the animals were 10 weeks of age with well-established high blood pressure. There was no difference in the plasma total and free cholesterol, triglyceride and phospholipid levels between the Maitake fed animals and the control. On the other hand, Shiitake mushroom did not reduce the blood pressure, but significantly lower the plasma free cholesterol, triglyceride and phospholipid in compared with the control. The results suggest that dietary Maitake mushroom reduce the blood pressure.     

The effect of dietary sucrose on blood pressure in spontaneously hypertensive rats

The current study examined the effects of long-term isocaloric substitution of dietary sucrose for cornstarch in semisynthetic diets containing 60% carbohydrate (w/w) on blood pressure in spontaneously hypertensive rats (SHR). Four diets were initiated when the SHR were 8–9 weeks of age. A total of 32 SHR were placed on normal (0.08%) sodium diets (0.2% NaCl), and 32 SHR were placed on high (0.80%) sodium diets (2.0% NaCl). Each sodium group was further subdivided into two groups, one ingesting 60% sucrose (w/w); the other, 0% sucrose (60% cornstarch, w/w). Blood pressure and weight were measured at 1–2 month intervals for 17 weeks. No differences were noted in blood pressure between animals ingesting 0% sucrose and those ingesting 60% sucrose in either sodium group. The results indicate that long-term isocaloric substitution of sucrose for cornstarch beginning at 8–9 weeks of age in SHR does not affect the development of hypertension at either normal or high sodium levels.     

The potential of cod hydrolyzate to inhibit blood pressure in spontaneously hypertensive rats

Hypertension is an independent yet controllable risk factor for cardiovascular diseases. Synthetic angiotensin-converting enzyme (ACE) inhibitors used to treat hypertension are often associated with adverse effects, and the interest in diet-related inhibitors is increasing. We hypothesized that North Atlantic fish hydrolysate might inhibit ACE, thus preventing hypertension. We assessed the ACE inhibitory potential of various North Atlantic fish species and evaluated the effect of dietary supplementation of fish hydrolysates on the blood pressure of spontaneously hypertensive rats. Fish samples were hydrolyzed using simulated gastrointestinal digestion, and ACE inhibitory activity was evaluated using an ACE inhibitory activity assay. In vivo anti-hypertensive effects were evaluated by administering hydrolysates of wild Atlantic cod (Gadus morhua L.), haddock (Melanogrammus aeglefinus L.), or farmed Atlantic salmon (Salmo salar L.) to 10-week-old male, spontaneously hypertensive rats for 4 weeks. The dosing was 200 mg/kg body weight for 21 days, followed by 500 mg/kg body weight for 7 days. Water and Captopril (20 mg/kg body weight) were administered as the negative and positive controls, respectively. The analyzed fish hydrolysates exhibited a 50 % ACE inhibition coefficient (IC₅₀) of 1 to 2.7 μg/mU ACE. Fish hydrolysate supplements did not significantly inhibit the increase in blood pressure during the experimental period. The group receiving cod supplement had a lower (not significant) increase in blood pressure compared to the other groups. Although further studies are necessary to verify the antihypertensive effect of cod, the results obtained in this study indicate the potential that cod hydrolysate may have in inhibiting hypertension.     

Plant sterols and casein-derived tripeptides attenuate blood pressure increase in spontaneously hypertensive rats

In this study, we investigated the synergistic effects of plant sterols (PS) and casein-derived tripeptides on arterial tone and blood pressure in experimental hypertension. We hypothesized that PS and tripeptides could have positive, synergistic effects on the development of hypertension and endothelial dysfunction in young spontaneously hypertensive rats (SHR). Six-week-old male SHR were divided into 3 groups to receive milk products containing PS, or PS with tripeptides, or a control containing no active components for 8 weeks. Systolic blood pressure (SBP) was measured weekly, and vascular reactivity measurements with isolated mesenteric arteries were performed at the end of the study. Biochemical measurements for several parameters were performed by enzyme-linked immunosorbent assay using plasma samples. Levels of angiotensin-converting enzyme 1, cyclooxygenase-2, endothelial nitric oxide synthase, and P-selectin messenger RNA expressions were determined from aortic tissue by real-time polymerase chain reaction. The study showed that long-term treatment with PS + tripeptides attenuated the development of hypertension in SHR (SBP, 187 ± 5 mm Hg vs 169 ± 4 mm Hg in control group; P < .01). Plant sterols alone did not affect SBP significantly. Endothelial dysfunction was observed in all SHR; however, treatment with PS resulted in poorer endothelium-dependent and nitric oxide–mediated relaxation compared with other groups. Aortic cyclooxygenase-2 and P-selectin were significantly down-regulated in PS and PS + tripeptides groups when compared with the control group. The expression of endothelial nitric oxide synthase was significantly lower in PS than in PS + tripeptides group. In conclusion, long-term treatment with PS has a slight but not significant antihypertensive effect. Plant sterols do not provide any beneficial effects on endothelial function in hypertensive rats; however, treatment with both PS and tripeptides showed mild anti-inflammatory effects.     

Effect of milk protein and fat intake on blood pressure and the incidence of cerebrovascular diseases in stroke-prone spontaneously hypertensive rats (SHRSP)

The intake of two milk protein-rich diets containing casein and whey protein attenuated the development of severe hypertension in stroke-prone spontaneously hypertensive rats (SHRSP), and extended their life span in comparison with SHRSP on a regular stock diet. Milk fat-rich diet intake reduced the incidence of cerebrovascular disease in SHRSP without a significant fall in blood pressure. These results suggest that certain milk components have a preventive effect on hypertension and cerebrovascular disease in SHRSP.     

Antihypertensive effects of Gynura procumbens extract in spontaneously hypertensive rats

Aqueous extracts of Gynura procumbens (Lour.) Merr. were orally administered to spontaneously hypertensive (SHR) rats for 4 weeks, and antihypertensive effects were determined. Oral administration of 500 mg/kg of G. procumbens (Lour.) Merr. extract (GPE) resulted in significantly lower blood pressure in SHR rats compared with SHR rats not given GPE (P < .05). Furthermore, GPE-administered rats had significantly lower serum lactate dehydrogenase, creatine phosphate kinase, and increased nitric oxide (NO), a known vasodilator, compared with the non-GPE-administered SHR group (P < .05). These results suggest that oral administration of aqueous GPE may be useful for prevention and treatment of hypertension through increasing NO production in blood vessels.     

Comparative effects of plant oils on the cerebral hemorrhage in stroke-prone spontaneously hypertensive rats

Objectives: Since oils and fats can induce metabolic syndrome, leading to cardiovascular and cerebrovascular diseases, the present study was performed to find out whether the plant oils affect the cerebral hemorrhage in stroke-prone spontaneously hypertensive (SHR-SP) rats.

Methods: From 47 days of age, male SHR-SP rats were given drinking water containing 1% NaCl to induce hypertension, and simultaneously fed semi-purified diets containing 10% perilla oil, canola oil, or shortening. The onset time of convulsion following cerebral hemorrhage was recorded, and the areas of hemorrhage and infarction were analyzed in the stroke brains.

Results: In comparison with 58-day survival of SHR-SP rats during feeding NaCl alone, perilla oil extended the survival time to 68.5 days, whereas canola oil shortened it to 45.7 days. Feeding perilla oil greatly reduced the total volume of cerebral hemorrhage from 17.27% in the control group to 4.53%, while shortening increased the lesions to 21.23%. In a microscopic analysis, perilla oil also markedly decreased the hemorrhagic and infarction lesions to 1/10 of those in control rats, in contrast to an exacerbating effect of shortening. In blood analyses, perilla oil reduced blood total cholesterol and low-density lipoproteins which were increased in SHR-SP, but canola oil further increased them and markedly lowered platelet counts.

Discussion: Perilla oil delayed and attenuated cerebral hemorrhage by improving hyperlipidemia in hypertensive stroke animals, in contrast to the aggravating potential of canola oil and shortening. It is suggested that perilla oil should be the first choice oil for improving metabolic syndrome in hypertensive persons at risk of hemorrhagic stroke.     

Effect of foxtail millet protein hydrolysates on lowering blood pressure in spontaneously hypertensive rats

Purpose

The objective of this study was to determine the effect of foxtail millet protein hydrolysates on lowering blood pressure in spontaneously hypertensive rats (SHRs).

Methods

The protein of foxtail millet after extruding or fermenting and the raw foxtail millet was extracted and hydrolyzed by digestive protease to generate angiotensin-converting enzyme (ACE) inhibitory peptides. The potential antihypertensive effect of protein hydrolysates from foxtail millet in SHRs was investigated.

Results

After 4 weeks of treatment with 200 mg peptides/kg of body weight of protein hydrolysates, blood pressure was lowered significantly, and the raw and extruded samples were more effective than the fermented samples. The serum ACE activity and angiotensin II levels in the treatment groups were significantly lower than that of the control. The percent heart weight decreased in the treatment groups.

Conclusion

Thus, ingestion of foxtail millet protein hydrolysates especially for the raw and extruded hydrolysates may ameliorate hypertension and alleviate related cardiovascular diseases.

     

Whole cinnamon and aqueous extracts ameliorate sucrose-induced blood pressure elevations in spontaneously hypertensive rats

OBJECTIVE: Many agents (nutrients, nutraceuticals, and drugs) that enhance insulin sensitivity and/or reduce circulating insulin concentrations lower blood pressure (BP). Recently, it was reported that cinnamon has the potential to favorably influence the glucose/insulin system. Accordingly, the purpose of the present study was to examine the effects of dietary cinnamon on systolic BP (SBP), and various glucose- and insulin-related parameters in spontaneously hypertensive rats (SHR). METHODS: In a series of three experiments, treated SHR eating sucrose and non sucrose containing diets were given various amounts of cinnamon, cinnamon extracts, or chromium. Then various parameters such as: body weight, systolic blood pressure, hematology and blood chemistries were followed for three to four weeks. RESULTS: Diets high in sucrose content are associated with insulin resistance and the elevation of SBP. Addition to diets of cinnamon (8% w/w) reduced the SBP of rats eating sucrose containing diets to virtually the same levels as SHR consuming non sucrose containing (only starch) diets. The presence of cinnamon in the diet also decreased the SBP of SHR consuming a non sucrose-containing diet, suggesting that cinnamon reduces more than just sucrose-induced SBP elevations--perhaps a genetic component(s) of the elevated BP as well. The effects of cinnamon on SBP tended to be dose-dependent. Cinnamon did not decrease the levels of blood glucose, but did lower circulating insulin concentrations. Aqueous extracts of cinnamon also decreased SBP and lowered the circulating levels of fructosamine. CONCLUSIONS: Cinnamon is used for flavor and taste in food preparation, but cinnamon may have additional roles in glucose metabolism and BP regulation. Therefore, BP regulation may not only be influenced favorably by limiting the amounts of dietary substances that have negative effects on BP and insulin function but also by the addition of beneficial ones, such as cinnamon, that have positive effects.     

Influence of different progestogens on blood pressure of non-anaesthetized male spontaneously hypertensive rats.

The aim of the study was to find out if synthetic progestins with significant antimineralocorticoid activity would have a beneficial effect on blood pressure. Male spontaneously hypertensive rats were treated daily for four weeks with different progestogens by subcutaneous injection. Arterial pressure of the conscious animals was measured at three-day intervals. Progestogens were dosed on the basis of their progestogenic activity, whereby the dosages corresponded to the 10-fold effective dose for inhibition of ovulation in rats. For comparison, spironolactone as well as progesterone itself were included in the study. After four weeks' treatment, plasma volume, extracellular fluid volume (ECFV) and the sodium and potassium concentrations in the plasma were measured. In control animals, there was a slight decrease in blood pressure over the four-week experimental period. Progesterone and spironolactone similarly influenced blood pressure. A new progestin with significant antialdosterone activity, dihydrospirorenone (code No. ZK 30.595), slightly but significantly decreased the ECFV, plasma sodium concentration and slightly but insignificantly decreased blood pressure as compared to vehicle-treated controls. Synthetic progestins lacking this antimineralocorticoid activity did not decrease blood pressure, but rather induced a slight increase in this animal model. The results clearly support the hypothesis that synthetic progestins, like endogenous progesterone, all of them with inherent antialdosterone activity, decrease the ECFV and so might have an impact on extracellular fluid hemostasis as well as blood pressure regulation.     

Effects of vitamin C on high blood pressure induced by salt in spontaneously hypertensive rats

By breeding and feeding salt to spontaneously hypertensive rats (SHR) continuously over a long period (until 60 wk old), rats with systolic blood pressures (SBP) of over 270 mmHg were prepared. It was studied whether or not supplying large amounts of vitamin C (200 mg/rat/d) over this period might bring any beneficial effect to blood pressure. Moreover, physico-chemical studies were performed to measure the components and enzymes in the blood and urine at 53 and 60 wk-old, and biochemical studies on vitamin C were also carried out in this experiment. Male (14 rats: 7 wk-old, 100-105 g) and female (15 rats: 7 wk-old, 95-100 g) SHR were divided into three groups and bred continuously for 53 wk. The A group rats were given salt (2.5 g/100 g of diet), the B group rats were given salt and vitamin C (500 mg/100 mL of drinking water), and the C group rats were controls. The results showed almost the same tendencies between male and female rats. The body weights of the SHR in groups A and B were slightly lower than group C. The amount of food intake in groups A and B was almost the same as group C. The amount of water intake was, in the order from highest to lowest, group A, B and C. The SBP of group A rats exhibited the highest value among the three groups. The SBP of group B rats given vitamin C simultaneously with the salt resulted in a low blood pressure level close to that of the controls (group C). Furthermore, the DBP (diastolic blood pressure) also reflected the antihypertensive effect of vitamin C as well. The heartbeat of the rats was highest in group A, and was comparable to the value in the rats receiving vitamin C simultaneously with salt. For the tests on occult blood and protein in the urine, group A rats showed strong positive reactions, whereas the group B and C rats had decreased results for both tests. The organ weights of the liver, stomach, spleen, adrenal gland and kidneys per 100 g rat body weight were not different among the three groups. The values for the bilirubin content, and the enzyme activities of ALT and AST in the blood showed to be the highest in the male rats of group A. The values from the group B rats decreased near to the normal value like the control group. Vitamin C was found to decrease the blood pressure in SHR, and also to work effectively to protect liver and kidney functions even under the condition of very high blood pressure, as high as 250 mmHg.     

适量白酒对自发性高血压大鼠血压及血管内皮功能影响的研究

目的 研究适量白酒对自发性高血压大鼠的血压及血管内皮功能的影响。方法 48只自发性高血压大鼠(SHR)随机分为4组(12只/组):空白对照组、剂量①组[0.9ml/(kg·d)]、剂量②组[1.1ml/(kg·d)]、剂量③组[2.2ml/(kg·d)]。空白对照组给予2.2ml/(kg·d)纯水灌胃,各剂量组给予48°浓香型白酒灌胃。用无创套尾法测量大鼠血压,连续灌胃8周后采用酶联免疫吸附法测定SHR血清中内皮素(ET)、血管紧张素Ⅱ(Ang-Ⅱ)、一氧化氮(NO)、诱导型一氧化氮合酶(iNOS)、内皮型一氧化氮合酶(eNOS)及超敏C反应蛋白(hs-CRP)含量。结果 连续灌胃8周后与空白对照组比较,各剂量组大鼠血压无统计学差异(P>0.05);剂量②、③组ET、hs-CRP含量降低(P<0.05),剂量②组iNOS水平降低(P<0.05),各组Ang-Ⅱ、NO、eNOS水平无明显差异(P>0.05)。结论 适量白酒对SHR血压无直接的显著影响,但可降低其ET、hs-CRP和iNOS含量。