Abstract
The aim of this present study was to investigate the effect of ursolic acid (UA) and rosiglitazone (RSG) on insulin sensitivity and proximal insulin signaling pathways in high-fat diet (HFD)-fed C57/BL/6J mice. Male C57BL/6J mice were fed either normal diet or HFD for 10 weeks, after which animals in each dietary group were divided into the following six groups (normal diet, normal diet plus UA and RSG, HFD alone, HFD plus UA, HFD plus RSG, and HFD plus UA and RSG) for the next 5 weeks. UA (5 mg/kg BW) and RSG (4 mg/kg BW) were administered as suspensions directly into the stomach using a gastric tube. The HFD diet elevated fasting plasma glucose, insulin, and homeostasis model assessment index. The expression of insulin receptor substrate (IRS)-1, phosphoinositide 3-kinase (PI3-kinase), Akt, and glucose transporter (GLUT) 4 were determined by Western blot analyses. The results demonstrated that combination treatment (UA/RSG) ameliorated HFD-induced glucose intolerance and insulin resistance by improving the homeostatic model assessment (HOMA) index. Further, combination treatment (UA/RSG) stimulated the IRS-1, PI3-kinase, Akt, and GLUT 4 translocation. These results strongly suggest that combination treatment (UA/RSG) activates IRS-PI3-kinase-Akt-dependent signaling pathways to induce GLUT 4 translocation and increases the expression of insulin receptor to improve glucose intolerance.
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The financial support to Arjunan Sundaresan as Senior Research Fellowship (No. 3/1/2/22/2010-RHNdated16.08.2010) from Indian Council of Medical Research (ICMR), New Delhi, is gratefully acknowledged.
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Sundaresan, A., Radhiga, T. & Pugalendi, K.V. Ursolic acid and rosiglitazone combination improves insulin sensitivity by increasing the skeletal muscle insulin-stimulated IRS-1 tyrosine phosphorylation in high-fat diet-fed C57BL/6J mice. J Physiol Biochem 72, 345–352 (2016). https://doi.org/10.1007/s13105-016-0484-6
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DOI: https://doi.org/10.1007/s13105-016-0484-6