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Gen Comp Endocrinol. 2015 Apr 1;214:134-9. doi: 10.1016/j.ygcen.2014.06.029. Epub 2014 Jul 10.

Relationship of p53 accumulation in peripheral tissues of high-fat diet-induced obese rats with decrease in metabolic and oncogenic signaling of insulin.

Author information

1
Department of Biochemistry, Fasa University of Medical Sciences, Fasa, Iran.
2
Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
3
National Nutrition and Food Technology Research Institute, Faculty of Nutrition Science and Food Technology, Department of Basic Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
4
Faculty of Nutrition and Diet Therapy, Department of Cellular and Molecular Nutrition, Tehran University of Medical Sciences, Tehran, Iran.
5
National Nutrition and Food Technology Research Institute, Faculty of Nutrition Science and Food Technology, Department of Basic Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: hamid_zand@sbmu.ac.ir.

Abstract

This paper aimed to explore the role of p53 in adipose and some other peripheral tissues of a diet-induced obese model and targeted it using pharmacological approach to ameliorate diet-induced insulin resistance. Five week old male Wistar rats were randomly divided into three groups and fed on low-fat diet (13% control lean group), high-fat diet (41% obese group), or high-fat diet plus a single dose of pifithrin-α in the end of experiments (PFT group). Insulin, glucose, and other serum parameters were analyzed by standard colorimetric kits. Protein levels were evaluated by immunoblotting and immunofluorescence methods. After 12weeks, both body weight and insulin resistance were significantly higher in obese rats than in the control ones. P53 and PTEN protein levels were markedly elevated in peripheral tissues in addition to adipose tissues. AKT activation was decreased in the peripheral tissues of obese rats and was in correlation with the increase of p53 and PTEN level. Systemic pifithrin-α administration considerably diminished p53 levels and ameliorated AKT phosphorylation in all peripheral tissues including adipose tissues. Interestingly, the systemic inhibition of p53 was in correlation with improving insulin glucose at serum level. The present results clearly showed that p53 activation in peripheral tissues was in correlation with decreased insulin action. These results indicated p53 activation in the peripheral tissues of obese subjects as a protective mechanism against chronic insulin elevation, suggested that p53 could be a new target for the treatment of type 2 diabetes.

KEYWORDS:

Diet-induced obesity; Insulin resistance; Pifithrin-α; p53

PMID:
25016051
DOI:
10.1016/j.ygcen.2014.06.029
[Indexed for MEDLINE]
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