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BioMed Research International
Volume 2013, Article ID 231378, 9 pages
Research Article

Potential Utility of Sodium Selenate as an Adjunct to Metformin in Treating Type II Diabetes Mellitus in Rats: A Perspective on Protein Tyrosine Phosphatase

1Pharmacology Department, Faculty of Pharmacy, Misr International University (MIU), KM 28 Cairo-Ismailia Road (Ahmed Orabi District), Cairo, Egypt
2Biochemistry Department, Faculty of Pharmacy, Misr International University (MIU), Cairo, Egypt
3Pharmacology Department, Faculty of Medicine, Assiut University, Cairo, Egypt
4Pharmacology Department, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt

Received 17 April 2013; Accepted 12 August 2013

Academic Editor: Ali Rizvi

Copyright © 2013 Rania M. Salama et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Metformin is widely regarded as the standard first-line antidiabetic agent, in terms of efficacy and safety profiles. However, in most patients with type II diabetes mellitus (T2DM), it was found that metformin alone is not enough to adequately control hyperglycemia. Thus, we designed this study with the aim to investigate the effect of sodium selenate, a protein tyrosine phosphatase (PTP) inhibitor, individually and as an adjunct to metformin, on a rat model that simulates the metabolic characteristics of human T2DM. T2DM model was achieved by feeding the rats with high-fat, high-fructose diet (HFFD) for 8 weeks followed by a low dose of streptozotocin (STZ) (35 mg/kg/day, i.p.). Changes in serum glucose, insulin, adiponectin, homeostasis model assessment of insulin resistance (HOMA-IR) index, and the lipid profile were assessed. In addition, the level of reduced glutathione (GSH) and the activity of PTP were determined in the liver. Results showed that the addition of sodium selenate to metformin was able to restore hepatic GSH back to normal levels. Also, this combination therapy corrected the altered serum total cholesterol (TC), triglycerides (TG), and adiponectin levels. In conclusion, additive therapeutic effect was recorded when sodium selenate was used as an adjunct to metformin.