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Fructose-rich diet leads to reduced aerobic capacity and to liver injury in rats.

Botezelli JD, Cambri LT, Ghezzi AC, Dalia RA, Voltarelli FA, de Mello MA - Lipids Health Dis (2012)

Bottom Line: At the end of the experiment, sixteen animals were euthanized, and the following main variables were analysed: aerobic capacity, the serum aspartate aminotransferase (AST) to alanine aminotransferase (ALT) ratio, serum and liver triglyceride concentrations, serum and liver thiobarbituric acid reactive substance (TBARS) concentrations, serum and liver catalase and superoxide dismutase (SOD) activity and haematoxylin-eosin histology (HE) in hepatocytes.The remaining twelve animals were submitted to an analysis of their hepatic lipogenic rate.In conclusion, the fructose-rich diet caused significant liver damage and a reduction in insulin sensitivity in the animals, which could lead to deleterious metabolic effects.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physical Education, São Paulo State University - UNESP, Av: 24-A, 1515 Bela Vista,, 13506-900, Rio Claro, São Paulo, Brazil. jdbotezelli@yahoo.com.br

ABSTRACT
The main purpose of this research was to investigate the alterations in the aerobic capacity and appearance of metabolic alterations in Wistar rats fed on fructose-rich diet. We separated twenty-eight rats into two groups according to diet: a control group (C) (balanced diet) and a fructose-rich diet group (F). The animals were fed these diets for 60 d (d 120 to 180). We performed insulin, glucose as well as a minimum lactate test, at d 120 and 180. At the end of the experiment, sixteen animals were euthanized, and the following main variables were analysed: aerobic capacity, the serum aspartate aminotransferase (AST) to alanine aminotransferase (ALT) ratio, serum and liver triglyceride concentrations, serum and liver thiobarbituric acid reactive substance (TBARS) concentrations, serum and liver catalase and superoxide dismutase (SOD) activity and haematoxylin-eosin histology (HE) in hepatocytes. The remaining twelve animals were submitted to an analysis of their hepatic lipogenic rate. The animals fed a fructose-rich diet exhibited a reduction in aerobic capacity, glucose tolerance and insulin sensitivity and increased concentrations of triglycerides and TBARS in the liver. Catalase and SOD activities were reduced in the livers of the fructose-fed animals. In addition, the serum AST/ALT ratio was higher than that of the C group, which indicates hepatic damage, and the damage was confirmed by histology. In conclusion, the fructose-rich diet caused significant liver damage and a reduction in insulin sensitivity in the animals, which could lead to deleterious metabolic effects.

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Related in: MedlinePlus

Minimum lactate test of one animal of each group, as an example. In these particular cases, the estimated ML was 4.21 % of body weight, while the interpolated blood lactate concentration was 3.96 mM for the C (Control) animal and for F (Fructose) animal we found 2.53 % of body weight and 3.94 mM blood lactate interpolated concentration.
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Figure 1: Minimum lactate test of one animal of each group, as an example. In these particular cases, the estimated ML was 4.21 % of body weight, while the interpolated blood lactate concentration was 3.96 mM for the C (Control) animal and for F (Fructose) animal we found 2.53 % of body weight and 3.94 mM blood lactate interpolated concentration.

Mentions: The minimal lactate test is showed in Figure 1. Two rats were used as example to show the lactate changes through the test.


Fructose-rich diet leads to reduced aerobic capacity and to liver injury in rats.

Botezelli JD, Cambri LT, Ghezzi AC, Dalia RA, Voltarelli FA, de Mello MA - Lipids Health Dis (2012)

Minimum lactate test of one animal of each group, as an example. In these particular cases, the estimated ML was 4.21 % of body weight, while the interpolated blood lactate concentration was 3.96 mM for the C (Control) animal and for F (Fructose) animal we found 2.53 % of body weight and 3.94 mM blood lactate interpolated concentration.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3473252&req=5

Figure 1: Minimum lactate test of one animal of each group, as an example. In these particular cases, the estimated ML was 4.21 % of body weight, while the interpolated blood lactate concentration was 3.96 mM for the C (Control) animal and for F (Fructose) animal we found 2.53 % of body weight and 3.94 mM blood lactate interpolated concentration.
Mentions: The minimal lactate test is showed in Figure 1. Two rats were used as example to show the lactate changes through the test.

Bottom Line: At the end of the experiment, sixteen animals were euthanized, and the following main variables were analysed: aerobic capacity, the serum aspartate aminotransferase (AST) to alanine aminotransferase (ALT) ratio, serum and liver triglyceride concentrations, serum and liver thiobarbituric acid reactive substance (TBARS) concentrations, serum and liver catalase and superoxide dismutase (SOD) activity and haematoxylin-eosin histology (HE) in hepatocytes.The remaining twelve animals were submitted to an analysis of their hepatic lipogenic rate.In conclusion, the fructose-rich diet caused significant liver damage and a reduction in insulin sensitivity in the animals, which could lead to deleterious metabolic effects.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physical Education, São Paulo State University - UNESP, Av: 24-A, 1515 Bela Vista,, 13506-900, Rio Claro, São Paulo, Brazil. jdbotezelli@yahoo.com.br

ABSTRACT
The main purpose of this research was to investigate the alterations in the aerobic capacity and appearance of metabolic alterations in Wistar rats fed on fructose-rich diet. We separated twenty-eight rats into two groups according to diet: a control group (C) (balanced diet) and a fructose-rich diet group (F). The animals were fed these diets for 60 d (d 120 to 180). We performed insulin, glucose as well as a minimum lactate test, at d 120 and 180. At the end of the experiment, sixteen animals were euthanized, and the following main variables were analysed: aerobic capacity, the serum aspartate aminotransferase (AST) to alanine aminotransferase (ALT) ratio, serum and liver triglyceride concentrations, serum and liver thiobarbituric acid reactive substance (TBARS) concentrations, serum and liver catalase and superoxide dismutase (SOD) activity and haematoxylin-eosin histology (HE) in hepatocytes. The remaining twelve animals were submitted to an analysis of their hepatic lipogenic rate. The animals fed a fructose-rich diet exhibited a reduction in aerobic capacity, glucose tolerance and insulin sensitivity and increased concentrations of triglycerides and TBARS in the liver. Catalase and SOD activities were reduced in the livers of the fructose-fed animals. In addition, the serum AST/ALT ratio was higher than that of the C group, which indicates hepatic damage, and the damage was confirmed by histology. In conclusion, the fructose-rich diet caused significant liver damage and a reduction in insulin sensitivity in the animals, which could lead to deleterious metabolic effects.

Show MeSH
Related in: MedlinePlus