scholarly journals Low-Dose Curcumin Nanoparticles Normalise Blood Pressure in Male Wistar Rats with Diet-Induced Metabolic Syndrome

Nutrients ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1542 ◽  
Author(s):  
Ryan du Preez ◽  
Jessica Pahl ◽  
Meenakshi Arora ◽  
M. N. V. Ravi Kumar ◽  
Lindsay Brown ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Metabolic Syndrome ◽  
Systolic Blood Pressure ◽  
Wistar Rats ◽  
Low Dose ◽  
Left Ventricular ◽  
High Dose ◽  
Curcumin Nanoparticles ◽  
Diastolic Stiffness ◽  
Male Wistar Rats

Nanoparticle formulations improve bioavailability and so may allow low-dose formulations of food-derived compounds such as curcumin to attenuate chronic systemic disease despite intrinsically low oral bioavailability. The current study induced metabolic syndrome in male Wistar rats aged eight–nine weeks using a high-carbohydrate, high-fat diet (H) with corn starch diet (C) as control. Using a reversal protocol, rats were given curcumin as either nanoparticles encapsulated in poly(lactic–co–glycolic acid) (5 mg/kg/day, HCNP) or as an unformulated low dose or high-dose suspension in water (low-dose, 5 mg/kg/day, HC5; high-dose, 100 mg/kg/day, HC100) or blank nanoparticles (HBNP) for the final eight weeks of the 16 week study. We analysed cardiovascular parameters including systolic blood pressure and left ventricular diastolic stiffness along with histopathology, liver parameters including plasma liver enzymes, histopathology and metabolic parameters, including glucose tolerance, blood lipid profile and body composition, and plasma curcumin concentrations. HC100 and HCNP but not HBNP normalised systolic blood pressure (C = 120 ± 4; H = 143 ± 5; HBNP = 141 ± 3; HC5 = 143 ± 4; HC100 = 126 ± 4; HCNP = 128 ± 4 mmHg), left ventricular diastolic stiffness and liver fat deposition. No other improvements were induced in HC100 or HCNP or other intervention groups (HC5 and HBNP). We conclude that 5 mg/kg/day curcumin nanoparticles in H rats showed similar improvements in cardiovascular function as 100 mg/kg/day unformulated curcumin correlating with similar plasma curcumin concentrations.

Dietary linoleic acid and salt-induced hypertension

1981 ◽  
Vol 59 (8) ◽  
pp. 872-875 ◽  
Author(s):  
Murray C. Macdonald ◽  
Robert L. Kline ◽  
Gordon J. Mogenson
Keyword(s):  
Blood Pressure ◽  
Linoleic Acid ◽  
Systolic Blood Pressure ◽  
Wistar Rats ◽  
Sodium Content ◽  
Significant Elevation ◽  
Dietary Linoleic Acid ◽  
Low Level ◽  
Induced Hypertension ◽  
Male Wistar Rats

Male Wistar rats chronically fed a low level (0.41%) of linoleic acid (LA) in the diet as supplied by 5% olive oil developed a significant elevation of systolic blood pressure as compared with rats fed either a medium (4.2%) or high (9.4%) level of dietary LA. Chronic excess intake of NaCl (3.75% in the diet) was associated with a significant elevation of blood pressure on all three diets but a low level of LA in the diet exaggerated the salt-induced hypertension. The results suggest that inadequate dietary LA may result in an increase in systolic blood pressure regardless of the sodium content of the diet.

scholarly journals Hepatotherapeutic Tendency of Citrullus lanatus Rind Methanolic Extract on Liver Markers in Male Wistar Rats

2019 ◽  
pp. 1-10
Author(s):  
Ilochi Ogadinma ◽  
Chuemere Arthur Nwafor ◽  
Bassy Samuel
Keyword(s):  
Liver Function ◽  
Wistar Rats ◽  
Liver Enzymes ◽  
Methanolic Extract ◽  
Citrullus Lanatus ◽  
Left Ventricular ◽  
Normal Male ◽  
High Dose ◽  
Serum Total Bilirubin ◽  
Male Wistar Rats

It is a common practice to dispose the peel or rind of fruits. Interestingly, some parts of fruits humans find unacceptable to eat actually possess bioactive nutrients that can be used for medicinal purposes.  The effect of methanolic extract of Citrullus lanatus rind on liver function in normal male wistar rats was studied. 24 wistar rats with body weight between 150-250 g were used for this study. The animals were randomly divided into four groups, with 6 rats in each. Group 1 contained the control given normal saline and feed; group 2, low dose, 50mg/kg of methanolic extract of  Citrullus lanatus rind was administered, group 3 and 4 were administered medium and high dose of Citrullus lanatus rind extract 100 mg/kg and 200 mg/kg respectively. The Citrullus lanatus rind extract was administered via orogastric route and the experiment lasted for a period of 56 days. Blood samples were collected by left ventricular cardiac puncture for liver function test at the last day of the experiment.  The outcome of this research revealed that medium and high dose administration of citrullus lanatus rind significantly (p≤0.05) reduced the serum level of liver enzymes alanine transaminase, aspartate transaminase and alkaline phosphatase and also total protein.There was a non-significant (P≤0.05) change in serum total bilirubin and albumin when all doses were compared to the control. Prolonged and moderate ingestion of Citrullus lanatus rind may be of benefit in regulating blood level of liver enzymes; hence, this part of the fruit has therapeutic value.

scholarly journals Reversal of cardiovascular remodelling with candesartan

2001 ◽  
Vol 2 (1_suppl) ◽  
pp. S141-S147 ◽  
Author(s):  
Lindsay Brown ◽  
Andrew Fenning ◽  
Annie Shek ◽  
Darryl Burstow
Keyword(s):  
Blood Pressure ◽  
Left Ventricular ◽  
No Production ◽  
Collagen Deposition ◽  
Maximal Increase ◽  
Concentric Hypertrophy ◽  
Rate Of Increase ◽  
Diastolic Stiffness ◽  
Male Wistar Rats ◽  
Ectopic Beats

Cardiovascular remodelling, defined as ventricular and vascular hypertrophy together with fibrosis, characterises hypertension following inhibition of the production of the endogenous vasodilator, nitric oxide (NO). This study has determined whether the cardiovascular remodelling following chronic NO synthase inhibition can be reversed by administration of the selective angiotensin II AT1-receptor antagonist, candesartan. Male Wistar rats were treated with L-nitroarginine methyl ester (L-NAME, 400 mg/l in drinking water) for eight weeks and with candesartan cilexetil (2 mg/kg/day by oral gavage) for the last four weeks. L-NAME-treated rats became hypertensive with systolic blood pressure increasing from 110±4 mmHg (control) to 170±10 mmHg. Rats developed left ventricular hypertrophy (control 1.70±0.06; L-NAME 2.10±0.04 mg/kg body wt) with markedly increased deposition of perivascular and interstitial collagen. Candesartan returned blood pressure, left ventricular weights and collagen deposition to control values. Echocardiographic assessment showed concentric hypertrophy with an increased fractional shortening; this was reversed by candesartan treatment. Heart failure was not evident. In the isolated Langendorff heart, diastolic stiffness increased in L-NAME-treated rats while the rate of increase in pressure (+dP/dt) increased after eight weeks only; candesartan reduced collagen deposition and normalised +dP/dt. In isolated left ventricular papillary muscles, the potency (negative log EC50) of noradrenaline as a positive inotropic compound was unchanged, (control 6.56±0.14); maximal increase in force before ectopic beats was reduced from 5.0±0.4 mN to 2.0±0.2 mN. Noradrenaline potency as a vasoconstrictor in thoracic aortic rings was unchanged, but maximal contraction was markedly reduced from 25.2±2.0 mN to 3.0±0.3 mN; this was partially reversed by candesartan treatment. Thus, chronic inhibition of NO production with L-NAME induces hypertension, hypertrophy and fibrosis with increased toxicity and significant decreases in vascular responses to noradrenaline. These changes were at least partially reversible by treatment with candesartan, implying a significant role of AT1-receptors in L-NAME-induced cardiovascular changes.

scholarly journals DLBS1033 REDUCES BLOOD PRESSURE OF HYPERTENSIVE WISTAR-STRAIN RATS

2016 ◽  
Vol 51 (3) ◽  
pp. 168
Author(s):  
Suryono Suryono
Keyword(s):  
Blood Pressure ◽  
Systolic Blood Pressure ◽  
Wistar Rats ◽  
Blood Pressure Reduction ◽  
Test Results ◽  
Lower Systolic Blood Pressure ◽  
Treatment Groups ◽  
Wistar Strain ◽  
Male Wistar Rats ◽  
Biomedical Laboratory

The purpose of this study was to determine the effects of DLBS1033 on blood pressure reduction in hypertension--induced wistar strain rats. Design used in this study was true experimental design. The study was conducted at Biomedical Laboratory, Physiology, Faculty of Dentistry, Jember University, and Clinical and Community Pharmacy Laboratory, Pharmacy Faculty, Jember University. Subjects were taken from male Wistar rats aged 2-3 months, weighing 150-200 grams, as many as 22 rats. Intervention samples were induced into hypertension by giving prednisone in a dose of 1.5 mg/kg/day orally and 2% NaCl followed DLBS1033 of 0.5 grams/kgbw/day orally in the treatment group. T test results on systolic blood pressure (p = 0.00), which was <0.05, showing significant differences in systolic blood pressure in treatment groups. It can be concluded that DLBS1033 can lower systolic blood pressure in wistar rats with induced hypertension using prednisone 1.5 mg/kgbw/day and NaCl 2%.

High multivitamin intake by Wistar rats during pregnancy results in increased food intake and components of the metabolic syndrome in male offspring

2008 ◽  
Vol 295 (2) ◽  
pp. R575-R582 ◽  
Author(s):  
Ignatius M. Y. Szeto ◽  
Alfred Aziz ◽  
Paul J. Das ◽  
Ameer Y. Taha ◽  
Nobuhiko Okubo ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Metabolic Syndrome ◽  
Food Intake ◽  
Systolic Blood Pressure ◽  
Wistar Rats ◽  
Fasting Glucose ◽  
Male Offspring ◽  
Metabolic Phenotype ◽  
Oral Glucose ◽  
The Metabolic Syndrome

The effect of high multivitamin intake during pregnancy on the metabolic phenotype of rat offspring was investigated. Pregnant Wistar rats ( n = 10 per group) were fed the AIN-93G diet with the recommended vitamin (RV) content or a 10-fold increase [high vitamin (HV) content]. In experiment 1, male and female offspring were followed for 12 wk after weaning; in experiment 2, only males were followed for 28 wk. Body weight (BW) was measured weekly. Every 4 wk, after an overnight fast, food intake over 1 h was measured 30 min after a gavage of glucose or water. An oral glucose tolerance test was performed every 3–5 wk. Postweaning fasting glucose, insulin, ghrelin, glucagon-like peptide-1, and systolic blood pressure were measured. No difference in BW at birth or litter size was observed. Food intake was greater in males born to HV dams ( P < 0.05), and at 28 wk after weaning, BW was 8% higher ( P < 0.05) and fat pad mass was 27% higher ( P < 0.05). Food intake reduction after the glucose preload was nearly twofold less in males born to HV dams at 12 wk after weaning ( P < 0.05). Fasting glucose, insulin, and ghrelin were 11%, 62%, and 41% higher in males from HV dams at 14 wk after weaning ( P < 0.05). Blood glucose response was 46% higher at 23 wk after weaning ( P < 0.01), and systolic blood pressure was 16% higher at 28 wk after weaning ( P < 0.05). In conclusion, high multivitamin intake during pregnancy programmed the male offspring for the development of the components of metabolic syndrome in adulthood, possibly by its effects on central mechanisms of food intake control.

scholarly journals Comparative Study of the Effects of Methanolic Extracts of Spondias mombin Leaves and Curcuma longa Rhizomes on Serum Lipid Profile and Electrolytes in Alloxan Induced Diabetes in Male Wistar Rats

2020 ◽  
pp. 1-9
Author(s):  
Saronee Friday ◽  
Sunday O. Ojeka ◽  
Okekem Amadi ◽  
Ogadinma N. Ilochi ◽  
Datonye V. Dapper
Keyword(s):  
Lipid Profile ◽  
Serum Lipid ◽  
Wistar Rats ◽  
Low Dose ◽  
Curcuma Longa ◽  
Density Lipoprotein ◽  
Serum Lipid Profile ◽  
High Dose ◽  
Spondias Mombin ◽  
Male Wistar Rats

Introduction: Diabetes mellitus is an important risk factor for cardiovascular diseases; the possible uses of Spondias mombin and Curcuma longa rhizomes for the treatment of diabetes and cardiovascular disorders have become prevalent in our environment. Aim: The present study attempts a Comparative assessment of the effects of methanolic extracts of Spondias mombin leaves and Curcuma longa rhizomes on serum lipid profile and electrolytes in alloxan induced diabetes in male wistar rats. Methodology: 90 male wistar rats were randomly divided into 9 groups of 10 rats each. Diabetes was induced intraperitonially using alloxan at 200 mg/kg-bw. The different rat Groups were treated with extracts and glibenclamide orally for 42 days as follows: Group 1: untreated non diabetic; Group 2: untreated diabetic; Group 3: diabetic + low dose Spondias mombin; Group 4: diabetic + high dose Spondias mombin; Group 5: diabetic + low dose Curcuma longa; Group 6: diabetic + high dose Curcuma longa; Group 7: diabetic + low dose combined Spondias mombin and Curcuma longa; Group 8: diabetic + high dose combined Spondias mombin and Curcuma longa; and Group 9; diabetic + glibenclamide. Blood was collected on day 43 by cardiac puncture for determination of serum lipid profile and electrolytes. Results: Compared to Group 2, total serum cholesterol, triglyceride, low density lipoprotein and electrolytes were significantly reduced while high density lipoprotein was significantly increased in all treated Groups (p<0.05). Compared to Groups 3 to 6, Groups 7 and 8 rats showed a significant reduction in total cholesterol, triglyceride and low density lipoprotein as well as electrolytes (p<0.05): however, high density lipoprotein was significantly increased (p<0.05). Conclusion: Spondias mombin showed better hypolipidemic effects compared to Curcuma longa.  However, results show that combined treatment with both extracts had better hypolipidemic effects than administration of individual extracts. Further research is recommended to evaluate the possible mechanism of action of these extract.

scholarly journals Mineralocorticoid receptor blockade improves diastolic function independent of blood pressure reduction in a transgenic model of RAAS overexpression

2011 ◽  
Vol 300 (4) ◽  
pp. H1484-H1491 ◽  
Author(s):  
Javad Habibi ◽  
Vincent G. DeMarco ◽  
Lixin Ma ◽  
Lakshmi Pulakat ◽  
William E. Rainey ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Blood Pressure ◽  
Systolic Blood Pressure ◽  
Diastolic Dysfunction ◽  
Mineralocorticoid Receptor ◽  
Low Dose ◽  
Left Ventricular ◽  
Receptor Blockade ◽  
Conventional Dose ◽  
Mineralocorticoid Receptor Blockade

There is emerging evidence that aldosterone can promote diastolic dysfunction and cardiac fibrosis independent of blood pressure effects, perhaps through increased oxidative stress and inflammation. Accordingly, this investigation was designed to ascertain if mineralocorticoid receptor blockade improves diastolic dysfunction independently of changes in blood pressure through actions on myocardial oxidative stress and fibrosis. We used young transgenic (mRen2)27 [TG(mRen2)27] rats with increases in both tissue ANG II and circulating aldosterone, which manifests age-related increases in hypertension and cardiac dysfunction. Male TG(mRen2)27 and age-matched Sprague-Dawley rats were treated with either a low dose (∼1 mg·kg−1·day−1) or a vasodilatory, conventional dose (∼30 mg·kg−1·day−1) of spironolactone or placebo for 3 wk. TG(mRen2)27 rats displayed increases in systolic blood pressure and plasma aldosterone levels as well as impairments in left ventricular diastolic relaxation without changes in systolic function on cine MRI. TG(mRen2)27 hearts also displayed hypertrophy (left ventricular weight, cardiomyoctye hypertrophy, and septal wall thickness) as well as fibrosis (interstitial and perivascular). There were increases in oxidative stress in TG(mRen2)27 hearts, as evidenced by increases in NADPH oxidase activity and subunits as well as ROS formation. Low-dose spironolactone had no effect on systolic blood pressure but improved diastolic dysfunction comparable to a conventional dose. Both doses of spironolactone caused comparable reductions in ROS/3-nitrotryosine immunostaining and perivascular and interstitial fibrosis. These data support the notion mineralocorticoid receptor blockade improves diastolic dysfunction through improvements in oxidative stress and fibrosis independent of changes in systolic blood pressure.

Soybean proteins counteract heart remodeling in wistar rats fed a high sodium chloride diet

2019 ◽  
Vol 23 (6) ◽  
pp. 92-99
Author(s):  
I. G. Kayukov ◽  
O. N. Beresneva ◽  
M. M. Parastaeva ◽  
G. T. Ivanova ◽  
A. N. Kulikov ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Sodium Chloride ◽  
Cardiac Remodeling ◽  
Wistar Rats ◽  
Salt Intake ◽  
Left Ventricular ◽  
High Salt ◽  
Soy Proteins ◽  
High Sodium ◽  
Heart Remodeling

BACKGROUND. Increased salt intake is associated with a number of cardiovascular events, including increased blood pressure (BP) and the development of left ventricular hypertrophy (LVH). However, there is much evidence that a high content of sodium chloride in the diet does not always lead to an increase in BP, but almost inevitably causes cardiac remodeling, in particular, LVH. Many aspects of myocardial remodeling induced by high sodium content in the food have not been studied enough. THE AIM of the study was to trace the echocardiographic changes in Wistar rats fed the high salt ration and the high salt ration supplemented with soy proteins.MATERIAL AND METHODS. Echocardiography and BP measurements were performed on male Wistar rats, divided into three groups. The first (control; n = 8) included rats that received standard laboratory feed (20.16 % animal protein and 0.34 % NaCl); the second (n = 10) – animals that received standard feed and 8 % NaCl (high salt ration). The third group (n = 10) consisted of rats who consumed a low-protein diet containing 10 % soy protein isolate (SUPRO 760) and 8 % NaCl. The follow-up period was 2 and 4 months.THE RESULTS of the study showed that: (1) the intake of a large amount of salt with a diet does not necessarily lead to the formation of arterial hypertension; (2) despite the absence of a distinct increase in BP, under these conditions signs of cardiac remodeling, in particular, LVH, appear rather quickly; (3) supplementing a high-salt diet with soy isolates counteracts the development of LVH.CONCLUSION. High salt intake with food can cause heart remodeling, regardless of blood pressure, while soy proteins can counteract this process.

scholarly journals Urinary sodium excretion and the risk of cardiovascular disease: A community-based cohort study in Taiwan

2021 ◽  
pp. 1-42
Author(s):  
Yi-Jie Wang ◽  
Kuo-Lioug Chien ◽  
Hsiu-Ching Hsu ◽  
Hung-Ju Lin ◽  
Ta-Chen Su ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Metabolic Syndrome ◽  
Systolic Blood Pressure ◽  
Sodium Excretion ◽  
Urinary Sodium Excretion ◽  
Salt Sensitivity ◽  
Urinary Sodium ◽  
Mediating Effect ◽  
Cvd Risk ◽  
Media Thickness

Abstract Urinary sodium excretion is a potential risk factor for cardiovascular diseases (CVD). However, the underlying biological mechanisms and effects of salt sensitivity are unclear. The purpose of this study was to characterize the relative contribution of biological factors to the sodium-CVD association. A total of 2112 participants were enrolled in this study. Structured questionnaires and blood and urine samples were obtained. Twenty-four-hour sodium excretion was estimated using a single overnight urine sample. Hypertension, metabolic syndrome, and overweight status were considered to indicate salt sensitivity. Cox proportional hazard models were used to investigate the effects of salt sensitivity on urinary sodium excretion and CVD risk. The traditional mediation approach was used to calculate the proportion of mediation. The mean age (standard deviation) of the 2112 participants was 54.5 (12.2) years, and they were followed up for a mean of 14.1 [8.1] years. Compared with those in the lowest quartile, the highest baseline urinary sodium excretion (>4.2g/24 hours) was associated with a 43% higher CVD risk (hazard ratio, 1.43; 95% confidence interval, 1.02-1.99). Participants with high urinary sodium excretion, hypertension, or metabolic syndrome had a significantly high risk of CVD. The carotid intima-media thickness had the largest mediating effect (accounting for 35% of the sodium-CVD association), followed by systolic blood pressure (33%), left ventricular mass (28%), and diastolic blood pressure (14%). Higher urinary sodium excretion increased the risk of CVD, which was explained largely by carotid media-thickness and systolic blood pressure.

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