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Erschienen in: Lasers in Medical Science 1/2012

01.01.2012 | Original Article

Low-level infrared laser effect on plasmid DNA

verfasst von: Adenilson Souza Fonseca, Mauro Geller, Mario Bernardo Filho, Samuel Santos Valença, Flavia de Paoli

Erschienen in: Lasers in Medical Science | Ausgabe 1/2012

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Abstract

Low-level laser therapy is used in the treatment of many diseases based on its biostimulative effect. However, the photobiological basis for its mechanism of action and adverse effects are not well understood. The aim of this study, using experimental models, was to evaluate the effects of laser on bacterial plasmids in alkaline agarose gel electrophoresis and Escherichia coli cultures. The electrophoretic profile of bacterial plasmids in alkaline agarose gels were used for studying lesions in DNA exposed to infrared laser. Transformation efficiency and survival of Escherichia coli AB1157 (wild-type), BH20 (fpg/mutM - ), BW9091 (xth-), and DH5αF’Iq (recA - ) cells harboring pBSK plasmids were used as experimental models to assess the effect of laser on plasmid DNA outside and inside of cells. Data indicate low-level laser: (1) altered the electrophoretic profile of plasmids in alkaline gels at 2,500-Hz pulsed-emission mode but did not alter at continuous wave, 2.5- and 250-Hz pulsed-emission mode; (2) altered the transformation efficiency of plasmids in wild-type and fpg/mutM- E. coli cells; (3) altered the survival fpg/mutM-, xthA- and recA- E. coli cultures harboring pBSK plasmids. Low-level infrared laser with therapeutic fluencies at high frequency in pulsed-emission modes have effects on bacterial plasmids. Infrared laser action can differently affect the survival of plasmids in E. coli cells proficient and deficient in DNA repair mechanisms, therefore, laser therapy protocol should take into account fluencies, frequencies and wavelength of laser, as well as tissue conditions and genetic characteristics of cells before beginning treatment.
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Metadaten
Titel
Low-level infrared laser effect on plasmid DNA
verfasst von
Adenilson Souza Fonseca
Mauro Geller
Mario Bernardo Filho
Samuel Santos Valença
Flavia de Paoli
Publikationsdatum
01.01.2012
Verlag
Springer-Verlag
Erschienen in
Lasers in Medical Science / Ausgabe 1/2012
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-011-0905-2

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