Investigations into the potential anticancer activity of Maximin H5

Journal article

Dennison, SR, Harris, F and Phoenix, DA (2017). Investigations into the potential anticancer activity of Maximin H5. Biochimie. 137 (June), pp. 29-34. https://doi.org/10.1016/j.biochi.2017.02.013
AuthorsDennison, SR, Harris, F and Phoenix, DA
Abstract

Here we report the first major example of anionic amphibian host defence peptides (HDPs) with anticancer activity. Maximin H5 is a C-terminally amidated, anionic host defence peptide (MH5N) from toads of the Bombina genus, which was shown to possess activity against the glioma cell line, T98G (EC50 = 125 μM). The peptide adopted high levels of α-helical structure (57.3%) in the presence of model cancer membranes (DMPC:DMPS in a molar ratio of 10:1). MH5N also showed a strong ability to penetrate these model membranes (Π = 10.5 mN m-1), which correlated with levels of DMPS (R2 > 0.98). Taken with the high ability of the peptide to lyse these membranes (65.7%), it is proposed that maximin H5 kills cancer cells via membranolytic mechanisms that are promoted by anionic lipid. It was also found that C-terminally deaminated maximin H5 (MH5C) exhibited lower levels of α-helical structure in the presence of cancer membrane mimics (44.8%) along with a reduced ability to penetrate these membranes (Π = 8.1 mN m-1) and induce their lysis (56.6%). These data suggested that the two terminal amide groups of native maximin H5 are required for its optimal membranolytic and anticancer activity.

KeywordsBiochemistry And Cell Biology; Biochemistry & Molecular Biology
Year2017
JournalBiochimie
Journal citation137 (June), pp. 29-34
PublisherElsevier BV
ISSN0300-9084
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biochi.2017.02.013
Publication dates
Print27 Feb 2017
Publication process dates
Deposited13 Mar 2017
Accepted24 Feb 2017
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Open
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