<![CDATA[<b> Effects of Canola oil-based high fat diets on growth, fat deposition and serum triglyceride and cholesterol levels in lines of mice selected for high and low fat percentage</b>]]>

Background and Objective: Arterial stiffness is recognized as being an independent predictor of incipient vascular disease associated with obesity and metabolic syndrome. In obese subjects, the decrease in the plasma level of adiponectin, an anti-diabetic and anti-atherogenic adipokine, is well known. Hence the aim of our study was to examine the effect of loss of adiponectin on the development of arterial stiffness in response to a high fat diet. Methods and Results: Male 8-week old adiponectin knockout (APN KO) and C57BL/6 (control) mice were fed a high fat diet (60% Calories from fat) for 12 weeks to induce obesity and insulin resistance (n=10/group). APN KO and C57BL/6 mice were fed a low fat diet (10% Calories from fat) and used as lean controls (n=10/group). After 12 weeks on the high fat diet, the APN KO mice weighed significantly more than the C57BL/6 mice (45.1±1.3 g vs 40.1±1.1 g, p=0.0008) but there was no difference in the final weights between genotypes fed the low fat diet. APN KO mice on both high and low fat diets for 12 weeks developed insulin resistance as measured by oral glucose tolerance test (Area under curve (AUC) mmol/L х min = 437±70 and 438±57) as compared to the C57BL/6 mice fed low or high fat diets (AUC mmol/L х min = 251±27 and 245±43). Arterial stiffness was determined by Doppler pulse wave velocity analysis of the femoral artery. Pulse wave velocity was increased in APN KO mice fed a high fat diet relative to those fed the low fat diet (12.56±0.78 cm/s vs 9.47±0.95 cm/s, p=0.0035; n=8-10). Pulse wave velocity was not different between C57BL/6 control mice on the low or high fat diets (10.63±0.73 cm/s and 10.86±0.50 cm/s), thus revealing that only mice deficient in adiponectin developed arterial stiffness in response to high fat diet. Conclusions: Potentiation of the vascular stiffness in diet-induced obese APN KO mice indicates that adiponectin has a role in modulating vascular structure and the APN KO mouse models the vascular changes that occur in human obesity and metabolic disorders. Morphometric analysis of the aortic tissues for vessel thickness and expression of extracellular proteins will further validate the potential role of adiponectin on the maintenance of arterial elasticity in addition to its known effect on eNOS mediated vasoprotection.

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Hepatoprotective effect of chewable tablet of Centella asiatica (L.) Urb extractin Wistar rats induced by high fat diets

Indonesian Journal of Pharmacology and Therapy ◽

10.22146/ijpther.1128 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Akrom ◽

Feri Anggita Hastanto ◽

Laela hayu Nurani

Keyword(s):

Wistar Rats ◽

Serum Triglyceride ◽

Centella Asiatica ◽

High Fat ◽

Chewable Tablet ◽

High Fat Diets ◽

Group 3 ◽

Group 5 ◽

Group 2 ◽

Fat Diets

Gotukola or Centella asiatica (L.) Urban contains high flavonoids which well known as fatty liver protector. This study aimed to evaluate the hepatoprotective effect of chewable tablet of C. asiatica (L.) Urb extract (CTCE) in Wistar rats induced by high fat diets. Twenty-one Wistar male rats aged 8-12 weeks with body weight ranging from 100-150 g were used in this study. Rats were randomly divided into seven groups i.e. Group 1 as normal control, rats were given standard food, Group 2 as high fat diets control, rats were induced high fat diets (HFD),Group 3 as positive control, rats were induced HFD and given simvastatin, Group 4 as placebo control, rats were induced HFD and given placebo, Group 5-7 as treatment group, rats were induced HFD and given CTCE at doses of 100, 200 and 300 mg/kg BW, respectively. The HFD induction was conducted for five weeks andthe CTCE was given for one week in the last week of the induction. At the end of the intervention, blood triglyceride levels and SGPT as well SGOT activities were examined. Analysis of variance (ANOVA) with confidence interval of 95% (p<0.05) was applied. The results showed that the HFD induction increased the serum triglyceride levels and SGPT activity. The serum triglyceride levels and SGPT activity of Group 2 were significantly higher than Group 1 (p<0.05). Furthermore, the simvastatin and CTCE administration reduced the serum triglyceride levels and SGPT activity. The serum triglyceride levels and SGPT activity of Group 3, 5, 6and 7 were significantly lower than Group 2 and 4 (p<0.05). In addition, the serum triglyceride levels and SGPT activity of Group 5, 6 and 7 were significantly lower than Group 3 (p<0.05). In conclusion, CTCE can reduce the serum triglyceride levels and SGPT activity in Wistar rats induced by HFD.

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Dietary Folic Acid and Fat Alter Metabolism of Multiple Vitamins in Mice

Current Developments in Nutrition ◽

10.1093/cdn/nzaa067_005 ◽

2020 ◽

Vol 4 (Supplement_2) ◽

pp. 1778-1778

Author(s):

Keri Barron ◽

Natalia Krupenko

Keyword(s):

Folic Acid ◽

Vitamin A ◽

Metabolic Pathways ◽

Vitamin B6 ◽

High Fat ◽

Low Fat ◽

Funding Sources ◽

Low Fat Diet ◽

High Fat Diets ◽

Fat Diets

Abstract Objectives To determine how low and high folic acid (FA) intake, combined with either low or high-fat diets, affects other vitamins in mouse liver and plasma. Methods C57BL/6NHsd mice were placed on one of six diets at weaning and maintained for 16 weeks. The diets varied in their fat content and FA levels: low fat (14% kcal from fat) vs high fat (58% kcal from fat) with 3 different FA levels- 0 ppm FA (FD), 2 ppm FA (Ctrl), 12 ppm (FS). Diets were matched for all other vitamins and minerals. Untargeted metabolomics analysis of plasma and snap-frozen liver samples was conducted at Metabolon®. Results In liver, excess dietary folic acid on a low-fat diet resulted in significantly increased levels of pantothenate, α-tocopherol, FA and several folate metabolites. When FA was over-supplemented in combination with a high fat (HF) diet, α-tocopherol was increased along with several nicotinate and pantothenate metabolites. Interestingly, the HF-FD and -FS diets demonstrated similar effects. These diets resulted in significantly decreased levels of riboflavin, thiamine, vitamin A, and vitamin B6 metabolites while increasing levels of pantetheine metabolites. In plasma, fewer changes with significant differences were observed when mice were fed HF diets. Several nicotinate metabolites were significantly elevated due to the FD diet with no change due to FS. Additionally, there were no changes in pantothenate or riboflavin in the plasma. Interestingly, the HF- FD and -FS diets induced similar responses but in opposite directions in plasma vs liver. The plasma levels of thiamine, vitamin A, and vitamin B6 metabolites were all significantly increased due to both low and high FA, whereas in the liver they were decreased. Additionally, no changes in α-tocopherol were seen in plasma, but the HF-FD diet raised γ/β-tocopherol levels over 2-fold despite equal amounts of vitamin E among all diets. Conclusions Untargeted metabolomic analysis revealed that diets with too high or too low folate affect other vitamins both in liver and plasma. These effects were further modulated by dietary fat levels. The HF-FD and -FS diets had significant impact on vitamins A, B1, B2, B3, B5, B6, B9 and E, along with their related derivatives, which may have serious implications for multiple metabolic pathways. Funding Sources NIH.

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Dietary lipids modify receptor- and non-receptor-dependent components of alpha 1-adrenoceptor-mediated contraction

AJP Regulatory Integrative and Comparative Physiology ◽

10.1152/ajpregu.1991.261.6.r1465 ◽

1991 ◽

Vol 261 (6) ◽

pp. R1465-R1469 ◽

Cited By ~ 1

Author(s):

D. D. Hodgkin ◽

R. J. Boucek ◽

R. E. Purdy ◽

W. J. Pearce ◽

I. M. Fraser ◽

...

Keyword(s):

Olive Oil ◽

Contractile Response ◽

Corn Oil ◽

Dietary Lipids ◽

High Fat ◽

Low Fat ◽

Alpha Adrenoceptor ◽

Abdominal Aortic ◽

High Fat Diets ◽

Fat Diets

Dietary lipid modulation of alpha-adrenoceptor (adrenergic receptor)- and non-adrenoceptor-mediated contractile properties of isolated rat abdominal aortic segments were assessed during the early developmental period. Rats were raised from conception to 90 days of age on semisynthetic diets containing various types and amounts of lipids. Aortic segments from three groups of rats fed high-fat diets (15% wt/wt) consisting of olive oil, corn oil, or lard as the sole lipid sources were compared with those from rats fed a low-fat control diet containing corn oil (5% wt/wt). alpha-Adrenoceptor activities were assessed by measuring the norepinephrine dose response of the tissue rings with and without partial inactivation of alpha-receptors by benextramine. alpha-Adrenoceptor sensitivity to norepinephrine increased, whereas receptor affinity decreased significantly in rats raised on high-fat diets. Qualitative features of dietary lipids influenced non-adrenoceptor-dependent aspects of vascular contractility. Diets rich in polyunsaturated fatty acids (high- and low-fat corn oil) raised the maximum response to norepinephrine and the contractile response to 60 mM potassium compared with more-saturated diets (olive oil and lard). These results demonstrate an effect of chronic feeding of high dietary fat on alpha-adrenoceptor-mediated contractility of abdominal aortic rings from young Sprague-Dawley rats. Qualitative features of dietary lipids also appear to modify receptor-independent parameters of the contractile response of the arterial tissue rings in these animals.

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Whole body insulin sensitivity in Osborne-Mendel and S 5B/Pl rats eating a low- or high-fat diet

AJP Regulatory Integrative and Comparative Physiology ◽

10.1152/ajpregu.1992.263.4.r785 ◽

1992 ◽

Vol 263 (4) ◽

pp. R785-R789 ◽

Cited By ~ 4

Author(s):

T. A. Buchanan ◽

J. S. Fisler ◽

S. Underberger ◽

G. F. Sipos ◽

G. A. Bray

Keyword(s):

Insulin Sensitivity ◽

High Fat Diet ◽

Whole Body ◽

High Fat ◽

Low Fat ◽

Low Fat Diet ◽

High Fat Diets ◽

Glucose Clearance ◽

Fat Diets ◽

Fat Feeding

To determine whether whole body insulin sensitivity differs between a rat strain that does not (S 5B/Pl) and a strain that does [Osborne-Mendel (OM)] become obese when eating a high-fat diet, we performed euglycemic clamp studies in animals from each strain during low- and high-fat feeding. Clamps were performed after 2 days ("initial clamp") and 9 days ("final clamp") on each diet. Plasma glucose and insulin levels during the final 60 min of initial and final clamps were similar in S 5B/Pl and OM rats regardless of diet. Insulin sensitivity, measured as the glucose clearance rate during the final 60 min of the clamp, averaged 35 +/- 3 ml.kg-1.min-1 in S 5B/Pl rats after 2 days on a low-fat diet. This did not change significantly during an additional 7 days on the low-fat diet. The high-fat diet was associated with a 13% reduction in insulin sensitivity after 2 days and a 30% reduction after 9 days in S 5B/Pl rats. OM rats exhibited similar patterns of insulin sensitivity during low- and high-fat diets, albeit at lower insulin sensitivity overall (P < 0.0005 vs. S 5B/Pl). Mean glucose clearance after 2 days on the low-fat diet was 27 +/- 2 mg.kg-1.min-1 and did not change significantly during seven more days of low-fat feeding. The high-fat diet was associated with a 19% reduction in glucose clearance after 2 days and a 38% reduction after 9 days in OM rats. The magnitude of reduction in insulin sensitivity during high-fat diets did not differ significantly between strains.(ABSTRACT TRUNCATED AT 250 WORDS)

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