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 RESEARCH ARTICLE
Year : 2012  |  Volume : 44  |  Issue : 3  |  Page : 326-332

Antihyperglycemic effect of Annona squamosa hexane extract in type 2 diabetes animal model: PTP1B inhibition, a possible mechanism of action?


1 Department of Pharmacology, New Drug Discovery Research, Ranbaxy Laboratories Ltd.; Daiichi Sankyo Life Science Research Centre in India (RCI), Daiichi Sankyo India Pharma Private Ltd., Village Sarhaul, Sector-18, Gurgaon, Haryana, India
2 Department of Pharmacology, New Drug Discovery Research, Ranbaxy Laboratories Ltd., Gurgaon, Haryana, India
3 Centre for Biotechnology, Anna University, Chennai; Biotechnology, School of Bioengineering, SRM University, Kattankulathur, Tamil Nadu, India
4 Herbal Research, New Drug Discovery Research, Ranbaxy Laboratories Ltd.; Daiichi Sankyo Life Science Research Centre in India (RCI), Daiichi Sankyo India Pharma Private Ltd., Village Sarhaul, Sector-18, Gurgaon, Haryana, India
5 Herbal Research, New Drug Discovery Research, Ranbaxy Laboratories Ltd., Gurgaon, Haryana, India
6 Centre for Biotechnology, Anna University, Chennai, Tamil Nadu, India
7 Department of Pharmacology, Herbal Research and Analytical Chemistry, New Drug Discovery Research, Ranbaxy Laboratories Ltd.; Daiichi Sankyo Life Science Research Centre in India (RCI), Daiichi Sankyo India Pharma Private Ltd., Village Sarhaul, Sector-18, Gurgaon, Haryana, India

Correspondence Address:
Joseph Alex Davis
Department of Pharmacology, New Drug Discovery Research, Ranbaxy Laboratories Ltd.; Daiichi Sankyo Life Science Research Centre in India (RCI), Daiichi Sankyo India Pharma Private Ltd., Village Sarhaul, Sector-18, Gurgaon, Haryana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0253-7613.96304

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Aim: The mechanism of action of Annona squamosa hexane extract in mediating antihyperglycemic and antitriglyceridimic effect were investigated in this study. Materials and Methods: The effects of extract on glucose uptake, insulin receptor-β (IR-β), insulin receptor substrate-1 (IRS-1) phosphorylation and glucose transporter type 4 (GLUT4) and phosphoinositide 3-kinase (PI3 kinase) mRNA expression were studied in L6 myotubes. The in vitro mechanism of action was tested in protein-tyrosine phosphatase 1B (PTP1B), G-protein-coupled receptor 40 (GPR40), silent mating type information regulation 2 homolog 1 (SIRT1) and dipeptidyl peptidase-IV (DPP-IV) assays. The in vivo efficacy was characterized in ob/ob mice after an oral administration of the extract for 21 days. Results: The effect of extract promoted glucose uptake, IR-β and IRS-1 phosphorylation and GLUT4 and PI3 kinase mRNA upregulation in L6 myotubes. The extract inhibited PTP1B with an IC 50 17.4 ΅g/ml and did not modulate GPR40, SIRT1 or DPP-IV activities. An oral administration of extract in ob/ob mice for 21 days improved random blood glucose, triglyceride and oral glucose tolerance. Further, the extract did not result in body weight gain before and after treatment (29.3 vs. 33.6 g) compared to rosiglitazone where significant body weight gain was observed (28.4 vs. 44.5 g; *P<0.05 after treatment compared to before treatment). Conclusion: The results suggest that Annona squamosa hexane extract exerts its action by modulating insulin signaling through inhibition of PTP1B.






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