The in vitro effects of a single exposure of LASER irradiation on human breast carcinoma and immortalised human mammary epithelial cell lines

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Title The in vitro effects of a single exposure of LASER irradiation on human breast carcinoma and immortalised human mammary epithelial cell lines
Author Powell, Katie; Laakso, Liisa; McDonnell, Ann; Low, Pauline; Ralph, Stephen John
Publication Title Laser Therapy Vol 17 No 1, March 2008
Year Published 2008
Abstract The in vitro effects of a single exposure of LASER irradiation on human breast carcinoma and immortalised human mammary epithelial cell lines. Katie Powell(1&2), Dr Liisa Laakso(2), Dr Ann McDonnell(1), Dr Pauline Low(2), Dr Steve Ralph(2); Griffith University, Brisbane(1) and Gold Coast(2), Australia. PURPOSE: This research examined the cell proliferative response of two breast cancer cell lines and two immortalised human mammary epithelial cell lines in vitro to a range of doses of low level laser therapy (LLLT) at wavelengths of 780 nm, 830 nm and 904 nm. RELEVANCE: LLLT is used in the clinical treatment of post-mastectomy lymphoedema, although specific information on safety is scant and circumstantial. This presentation describes the first steps in gaining disease-specific knowledge upon which to develop guidelines for the safe clinical use of lasers in the management of post-mastectomy lymphoedema. METHODS: Human breast adenocarcinoma (MCF-7), human breast ductal carcinoma (MDA-MB-435S) and immortalised human mammary epithelial (SVCT and Bre80hTERT) cell lines were irradiated with a single exposure of laser at 0.5, 1, 2, 3, 4, 10 and 12 J/cm2 (=780 nm) and 0.5, 1, 2, 3, 4, 10 and 15 J/cm2 (=830 nm and 904 nm). Cell proliferation was assessed 24 hours after laser using XTT colorimetric assays. RESULTS: SVCT cell proliferation significantly increased after exposure to doses of 0.5, 1, 2, 3, 4, and 12 J/cm2 of laser at 780 nm and doses of 0.5, 1, 2, 4 and 10 J/cm2 of laser at 904 nm. The MDA-MB-435S and Bre80hTERT cell lines showed negligible effects with one exposure from all three wavelengths of laser and no dose response relationships were noted. The MCF-7 cells demonstrated an increasing dose response relationship with one exposure of 780 nm laser; and there were no dose response effects evident after exposure to 830 nm and 904 nm laser irradiation. CONCLUSIONS: Even though certain doses of laser increased MCF-7 cell proliferation, the amount of laser light penetrating through the skin clinically is considerably attenuated. Further in vivo research of LLLT is required before a definitive conclusion can be made regarding the safety of LLLT for post-mastectomy lymphoedema.
Peer Reviewed No
Published Yes
Conference name NZ Laser 2008
Location Queenstown
Date From 2008-04-25
Date To 2008-04-27
URI http://hdl.handle.net/10072/37109
Date Accessioned 2009-02-17
Date Available 2011-03-10T08:10:55Z
Language en_AU
Research Centre Griffith Health Institute; Centre for Musculoskeletal Research; Molecular Basis of Disease
Faculty Griffith Health Faculty
Subject PRE2009-Medical Biochemistry: Other
Publication Type Conference Publications (Extract Paper)
Publication Type Code e3

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