Document Detail

Electroporation and alternating current cause membrane permeation of photodynamic cytotoxins yielding necrosis and apoptosis of cancer cells.
MedLine Citation:
PMID:  20494629     Owner:  NLM     Status:  MEDLINE    
In order to increase the permeability of cell membranes for low doses of cytostatic drugs, two bioelectrochemical methods have been compared: (a) electric pore formation in the plasma membranes by single electric impulses (electroporation), and (b) reordering of membrane structure by alternating currents (capacitively coupled). These treatments were applied to human leukemic K-562 cells and human lymphoma U-937 cells, yielding apoptotic and necrotic effects, determined by flow cytometry. Additional cell death occurs after exposure to light irradiation at wavelengths lambda > 600 nm, of cells which were electroporated and had incorporated actinomycin-C or daunomycin (daunorubicin). It is observed that drug uptake after an exponentially decaying electroporation pulse of the initial field strength Eo=1.4 kV/cm and pulse time constants in the time range 0.5-3 ms is faster than during PEMF-treatment, i.e., application of an alternating current of 16 kHz, voltage U<100 V, I=55 mA, and exposure time 20 min. However, at the low a.c. voltage of this treatment, more apoptotic and necrotic cells are produced as compared to the electroporation treatment with one exponentially decaying voltage pulse. Thus, additional photodynamic action appears to be more effective than solely drugs and electroporation as applied in clinical electrochemotherapy, and more effective than the noninvasive pulsed electromagnetic fields (PEMFs), for cancer cells in general and animals bearing tumors in particular.
Nelly Traitcheva; Hermann Berg
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-10
Journal Detail:
Title:  Bioelectrochemistry (Amsterdam, Netherlands)     Volume:  79     ISSN:  1878-562X     ISO Abbreviation:  Bioelectrochemistry     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-08-03     Completed Date:  2010-12-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100953583     Medline TA:  Bioelectrochemistry     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  257-60     Citation Subset:  IM    
Copyright Information:
2010. Published by Elsevier B.V.
Institute of Plant Physiology "M. Popov," Bulgarian Acad. of Sciences, Sofia, Bulgaria.
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MeSH Terms
Apoptosis / physiology*
Cell Death / drug effects,  radiation effects
Cell Line, Tumor
Cell Membrane Permeability / drug effects,  physiology,  radiation effects*
Cytotoxins / metabolism*
Dactinomycin / analogs & derivatives,  pharmacology,  therapeutic use
Daunorubicin / pharmacology,  therapeutic use
Electromagnetic Fields*
Leukemia, Erythroblastic, Acute / pathology
Lymphoma / pathology
Necrosis / metabolism*
Neoplasms / pathology*
Time Factors
Reg. No./Substance:
0/Cytotoxins; 20830-81-3/Daunorubicin; 50-76-0/Dactinomycin; 8052-16-2/cactinomycin

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