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Insulinotropic Actions of the Frog Skin Host-Defense Peptide Alyteserin-2a: A Structure-Activity Study

Ojo, OO, Abdel-Wahab, Yasser, Flatt, Peter and Conlon, JM (2013) Insulinotropic Actions of the Frog Skin Host-Defense Peptide Alyteserin-2a: A Structure-Activity Study. Chemical Biology & Drug Design, 82 (2). pp. 196-204. [Journal article]

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URL: http://onlinelibrary.wiley.com/doi/10.1111/cbdd.12151/abstract;jsessionid=CFC827D87580DF3103F80F27763F2CCB.d01t04

DOI: 10.1111/cbdd.12151


Alyteserin-2a (ILGKLLSTAAGLLSNL.NH2 ) stimulated the rate of insulin release from BRIN-BD11 clonalβ cells at a concentration of 30 nm (p < 0.05) with a response of 296 ± 26% of basal release at 3 μm (p < 0.001). The insulinotropic actions of analogs containing substitutions by l-lysine, d-lysine, or l-tryptophan at sites that maintain amphipathicity were evaluated. The [G11K], [S7k], [S7k,G11k], and [G11k,N15K] analogs were the most potent stimulating insulin release at 0.01 nm (p < 0.05). The [S7K], [G11K], [S14K], [N15K], [G11k], and [S7K,G11K] analogs were the most effective producing an approximately twofold greater (p < 0.001) release of insulin at 3 μm compared with alyteserin-2a. The [T8W] and [A9W] analogs were less active than alyteserin-2a. No peptide-stimulated release of lactate dehydrogenase at concentrations up to 3 μm, indicating that the integrity of the plasma membrane had been preserved. Membrane depolarization and an increase in intracellular Ca2+ concentration are involved in the mechanism of action of the peptides. Administration of [G11k]alyteserin-2a (75 nmol/kg body weight) to high-fat-fed mice with obesity and insulin resistance significantly (p < 0.01) enhanced insulin release and improved glucose tolerance during the 60-min period following an intraperitoneal glucose load.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Biomedical Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Diabetes
ID Code:26448
Deposited By: Dr Nigel Irwin
Deposited On:23 Jul 2013 11:11
Last Modified:21 Aug 2013 08:26

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