Author(s): Rodrigues, Bárbara de A. ; Muñoz, Vitor R. ; Kuga, Gabriel K. [UNESP] ; Gaspar, Rafael C. ; Nakandakari, Susana C. B. R. ; Crisol, Barbara M. ; Botezelli, José D. ; Pauli, Luciana S. S. ; Da Silva, Adelino S. R. ; De Moura, Leandro P. ; Cintra, Dennys E. ; Ropelle, Eduardo R. ; Pauli, José R.
Date: 2018
Persistent ID: http://hdl.handle.net/11449/170298
Origin: Oasisbr
Subject(s): Food intake; Hypothalamus; Insulin; MKP-3; Obesity
Made available in DSpace on 2018-12-11T16:50:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-10-09
Mitogen-activated Protein Kinase Phosphatase 3 (MKP-3) has been involved in the negative regulation of insulin signaling. The absence of MKP-3 is also associated with reduced adiposity, increased energy expenditure and improved insulin sensitivity. The MKP-3 is known as the main Erk1/2 phosphatase and FoxO1 activator, which has repercussions on the gluconeogenesis pathway and hyperglycemia in obese mice. Recently, we showed that MKP-3 overexpression decreases FoxO1 phosphorylation in the hypothalamus of lean mice. However, the hypothalamic interaction between MKP-3 and FoxO1 during obesity was not investigated yet. Here, the MKP-3 expression and the effects on food intake and energy expenditure, were investigated in high-fat diet-induced obese mice. The results indicate that obesity in mice increased the MKP-3 protein content in the hypothalamus. This hypothalamic upregulation led to an increase of food intake, adiposity, and body weight. Furthermore, the obese mice with increased MKP-3 showed an insulin signaling impairment with reduction of insulin-induced FoxO1 and Erk1/2 phosphorylation in the hypothalamus. Moreover, a bioinformatics analysis of data demonstrated that hypothalamic MKP-3 mRNA levels were positively correlated with body weight and negatively correlated to oxygen consumption (VO2) in BXD mice. Taken together, our study reports that obesity is associated with increased protein levels of hypothalamic MKP-3, which is related to the reduction of FoxO1 and Erk1/2 phosphorylation in the hypothalamus as well as to an increase in body weight and a reduction in energy expenditure.
Laboratory of Molecular Biology of Exercise University of Campinas (UNICAMP)
São Paulo State University (Unesp) Institute of Biosciences
OCRC—Obesity and Comorbidities Research Center University of Campinas (UNICAMP)
School of Physical Education and Sport of Ribeirão Preto University of São Paulo (USP)
CEPECE—Center of Research in Sport Sciences School of Applied Sciences University of Campinas (UNICAMP)
Laboratory of Nutritional Genomics University of Campinas (UNICAMP)
São Paulo State University (Unesp) Institute of Biosciences
