Anti-diabetic potential of selected Malaysian seaweeds

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Authors: Chin, Y.X., Lim, P.E., Maggs, C.A., Phang, S.M., Sharifuddin, Y. and Green, B.D.

Journal: Journal of Applied Phycology

Volume: 27

Issue: 5

Pages: 2137-2148

eISSN: 1573-5176

ISSN: 0921-8971

DOI: 10.1007/s10811-014-0462-8

© 2014, Springer Science+Business Media Dordrecht. The emergence of type 2 diabetes mellitus (T2DM) as the pre-eminent global non-infectious disease has driven the search for new anti-diabetic strategies including utilising traditional food and herbs. In this investigation, we describe the anti-diabetic potential of six selected Malaysian seaweed species against recognised pharmacological targets. Specifically, we measured their ability to inhibit α-glucosidase and dipeptidyl-peptidase-4 (DPP-4) and also their ability to stimulate incretin hormone secretion in vitro. Crude water extracts of Halimeda macroloba, Padina sulcata, Sargassum binderi and Turbinaria conoides possessed potent inhibitory activities against α-glucosidase and DPP-4. The highest inhibitory activity against α-glucosidase was found in water extracts of the green seaweed species H. macroloba with an IC50value of 6.388 mg mL−1. Crude water extracts of the brown seaweeds studied namely P. sulcata, S. binderi and T. conoides, exhibited potent DPP-4 inhibition compared with the green seaweed H. macroloba. The brown seaweed also stimulates secretion of glucose-dependent insulinotrophic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) from pGIP neo STC-1 cells in vitro. H. macroloba stimulated GLP-1 secretion but not secretion of GIP.

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