Abstract
Geranium graveolens, Sarcopoterium spinosum and Varthemia iphionoides are utilized traditionally for diabetes ethnomedicine in Jordan. Their aqueous extracts (AE) for antidiabetic activity and mechanism of action were investigated in vitro. Insulin secretion and pancreatic proliferation as well as glucose diffusion in vitro bioassays were recruited. Similar to L-alanine, S. spinosum AE (0.01 and 0.5 mg/ml) potentiated acute glucose-stimulated Ca2+ regulated insulin secretion in the clonal pancreatic β-cell line MIN6 (19.3 and 20.6 folds, P < 0.001). G. graveolens and V. iphionoides AEs were inactive. Comparable to GLP-1-enhanced β-cell proliferation, G. graveolens AE (0.01 and 0.05 mg/ml), S. spinosum (0.1 mg/ml) and V. iphionoides AEs (0.5 and 1 mg/ml) induced augmentations in pancreatic BrdU incorporation (P < 0.05−0.001). Performing effectively as guar gum diffusional hindrance, all three plants’ AE concentrations retarded 24 h glucose efflux into external solution across dialysis membrane (P < 0.05−0.001). Conclusively β-cell mass expansion was augmented and carbohydrate absorption was reduced by all selected plants. Exceptionally, S. spinosum stimulated pancreatic insulin secretion.
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Acknowledgments
This work was financially supported by the Deanship of Academic Research, The University of Jordan [Grant numbers 218/2007–2008 and 29/2010–2011]. The authors thank Professor Jun-ichi Miyazaki, Osaka University, Japan for the gift of MIN6 cells and information on culturing. Further gratitude goes to Professor Peter Jones, King’s College London, UK. The technical assistance of Ismail Abaza and Dana AlQudah is acknowledged.
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Violet Kasabri, Rana Abu-Dahab and Fatma U. Afifi conceptualized and designed the study, performed statistical analyses, edited and reviewed manuscript, performed the literature survey and phytochemical analyses.
Randa Naffa, Lara Majdalawi and Hazar Shawash performed the experiments.
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Kasabri, V., Abu-Dahab, R., Afifi, F.U. et al. In vitro effects of Geranium graveolens, Sarcopoterium spinosum and Varthemia iphionoides extracts on pancreatic MIN6 proliferation and insulin secretion and on extrapancreatic glucose diffusion. Int J Diabetes Dev Ctries 33, 170–177 (2013). https://doi.org/10.1007/s13410-013-0131-5
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DOI: https://doi.org/10.1007/s13410-013-0131-5