Amelioration of mitochondrial dysfunction-induced insulin resistance in differentiated 3T3-L1 adipocytes via inhibition of NF-kappa B pathways

Abu Bakar, M.H. and Sarmidi, M.R. and Kai, C.K. and Huri, H.Z. and Yaakob, H. (2014) Amelioration of mitochondrial dysfunction-induced insulin resistance in differentiated 3T3-L1 adipocytes via inhibition of NF-kappa B pathways. International Journal of Molecular Sciences, 15 (12). pp. 22227-22257.

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Abstract

A growing body of evidence suggests that activation of nuclear factor kappa B (NF-kappa B) signaling pathways is among the inflammatory mechanism involved in the development of insulin resistance and chronic low-grade inflammation in adipose tissues derived from obese animal and human subjects. Nevertheless, little is known about the roles of NF-kappa B pathways in regulating mitochondrial function of the adipose tissues. In the present study, we sought to investigate the direct effects of celastrol (potent NF-kappa B inhibitor) upon mitochondrial dysfunction-induced insulin resistance in 3T3-L1 adipocytes. Celastrol ameliorates mitochondrial dysfunction by altering mitochondrial fusion and fission in adipocytes. The levels of oxidative DNA damage, protein carbonylation and lipid peroxidation were down-regulated. Further, the morphology and quantification of intracellular lipid droplets revealed the decrease of intracellular lipid accumulation with reduced lipolysis. Moreover, massive production of the pro-inflammatory mediators tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 beta (IL-1 beta) were markedly depleted. Insulin-stimulated glucose uptake activity was restored with the enhancement of insulin signaling pathways. This study signified that the treatments modulated towards knockdown of NF-kappa B transcription factor may counteract these metabolic insults exacerbated in our model of synergy between mitochondrial dysfunction and inflammation. These results demonstrate for the first time that NF-kappa B inhibition modulates mitochondrial dysfunction induced insulin resistance in 3T3-L1 adipocytes.

Item Type: Article
Funders: UNSPECIFIED
Uncontrolled Keywords: Adipocytes; mitochondrial dysfunction; inflammation; oxidative stress; insulin resistance; celastrol; nuclear factor kappa B (NF-kappa B)
Subjects: Q Science > Q Science (General)
Depositing User: Dr Mohd Faizal Hamzah
Date Deposited: 28 Jan 2016 01:39
Last Modified: 28 Jan 2016 01:39
URI: http://eprints.um.edu.my/id/eprint/15565

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