Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9497
Title: Novel mode of action of polybia-MPI, a novel antimicrobial peptide, in multi-drug resistant leukemic cells
Authors: Wang, KR
Yan, JX
Zhang, BZ
Song, JJ
Jia, PF
Wang, R
Keywords: Multi-drug resistant
Necrosis
Plasma membrane perturbation
Polybia-MPI
Selective toxicity
Issue Date: 2009
Publisher: Elsevier Ireland Ltd
Source: Cancer letters, 2009, v. 278, no. 1, p. 65-72 How to cite?
Journal: Cancer Letters 
Abstract: As the frequent emergency of resistant tumor cells during treatment, the development of new agents with new modes of action attracts a great deal of interest. Polybia-MPI was a short cationic α-helical amphiphilic peptide that has selective toxicity toward cancer cells but no hemolytic activity. Its target selectivity is based on the binding preference to membranes containing anionic phospholipids by electrostatic driving. Its ability to make PI and trypan blue permeate into tumor cells at the same rate (within minutes), suggests a killing mechanism that involves plasma membrane perturbation. SEM and confocal microscopy experiments verified that the cell died as a result of acute injury and bursting, suggesting necrosis. As compared to the conventional chemotherapy, polybia-MPI targets at the cell membrane rather than enters into the cell to exert its action. So it is difficult for tumor cells to develop resistance to polybia-MPI during treatment and its action is not affected by the common multi-drug resistant mechanism. Although this is an initial study that looked at its in vitro activity rather than the in vivo activity, with the increasing resistance of conventional chemotherapy, polybia-MPI may offer a novel therapeutic strategy in the treatment of multi-drug resistant cancer.
URI: http://hdl.handle.net/10397/9497
DOI: 10.1016/j.canlet.2008.12.027
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