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Differential viability response of prokaryotes and eukaryotes to high strength pulsed magnetic stimuli

Boda, Sunil Kumar and Ravikumar, K and Saini, Deepak K and Basu, Bikramjit (2015) Differential viability response of prokaryotes and eukaryotes to high strength pulsed magnetic stimuli. In: BIOELECTROCHEMISTRY, 106 (B). pp. 276-289.

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Official URL: http://dx.doi.org /10.1016/j.bioelechem.2015.07.00...

Abstract

The present study examines the efficacy of a high strength pulsed magnetic field (PMF) towards bacterial inactivation in vitro, without compromising eukaryotic cell viability. The differential response of prokaryotes Staphylococcus aureus (MESA), Staphylococcus epidermidis, and Escherichia coli], and eukaryotes C2C12 mouse myoblasts and human mesenchymal stem cells, hMSCs] upon exposure to varying PMF stimuli (1-4 T, 30 pulses, 40 ms pulse duration) is investigated. Among the prokaryotes, similar to 60% and similar to 70% reduction was recorded in the survival of staphylococcal species and E. coli, respectively at 4 T PMF as evaluated by colony forming unit (CPU) analysis and flow cytometry. A 2-5 fold increase in intracellular ROS (reactive oxygen species) levels suggests oxidative stress as the key mediator in PMF induced bacterial death/injury. The 4 T PMF treated staphylococci also exhibited longer doubling times. Both TEM and fluorescence microscopy revealed compromised membranes of PMF exposed bacteria. Under similar PMF exposure conditions, no immediate cytotoxicity was recorded in C2C12 mouse myoblasts and hMSCs, which can be attributed to the robust resistance towards oxidative stress. The ion interference of iron containing bacterial proteins is invoked to analytically explain the PMF induced ROS accumulation in prokaryotes. Overall, this study establishes the potential of PMF as a bactericidal method without affecting eukaryotic viability. This non-invasive stimulation protocol coupled with antimicrobial agents can be integrated as a potential methodology for the localized treatment of prosthetic infections. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords: PMF; Pulsed magnetic field; Flow cytometry; Prokaryotes; Eukaryotes; Reactive oxygen species (ROS)
Department/Centre: Division of Biological Sciences > Molecular Reproduction, Development & Genetics (formed by the merger of DBGL and CRBME)
Division of Chemical Sciences > Materials Research Centre
Others
Date Deposited: 05 Nov 2015 05:43
Last Modified: 05 Nov 2015 05:43
URI: http://eprints.iisc.ernet.in/id/eprint/52666

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