The in vitro effects of LASER on human mammary epithelial and human breast cancer cell lines
Author(s)
Laakso, Liisa
Powell, Katie
McDonnell, Ann
Ralph, Stephen
Griffith University Author(s)
Year published
2010
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Background: Despite limited safety data, Low Level Laser Therapy (LLLT) is used in the clinical treatment of breast cancer-related lymphoedema (BCRL). Objective: We aimed to compare the cell proliferative effects of a range of doses of LLLT at wavelengths of 780, 830 and 904 nm on human breast and immortalised human mammary epithelial cell lines in vitro. Materials and Methods: Human breast adenocarcinoma (MCF-7), human melanoma cell line (MDA-MB-435S/M14) 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 ...
View more >Background: Despite limited safety data, Low Level Laser Therapy (LLLT) is used in the clinical treatment of breast cancer-related lymphoedema (BCRL). Objective: We aimed to compare the cell proliferative effects of a range of doses of LLLT at wavelengths of 780, 830 and 904 nm on human breast and immortalised human mammary epithelial cell lines in vitro. Materials and Methods: Human breast adenocarcinoma (MCF-7), human melanoma cell line (MDA-MB-435S/M14) 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 and 904 nm). MCF-7 cells were further irradiated with two and three exposures of all wavelengths. Cell proliferation was assessed 24 hours after irradiation. Results: SVCT cell proliferation significantly increased after exposure to a range of doses at 780 and 904 nm irradiation. MDA-MB-435S and Bre80hTERT cell lines showed negligible effects to LASER exposure. MCF-7 cells irradiated with 780 nm LASER demonstrated an increasing dose response relationship after one exposure and a decreasing dose response relationship after three exposures. MCF-7 cells irradiated with 904 nm LASER demonstrated a decreasing dose response relationship after two and three exposures. Conclusion: Although certain LASER doses increased MCF-7 cell proliferation, multiple exposures had no effect or a decreasing effect on dose response relationships. Before a definitive conclusion can be made regarding LASER safety for BCRL, further in vivo research is necessary.
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View more >Background: Despite limited safety data, Low Level Laser Therapy (LLLT) is used in the clinical treatment of breast cancer-related lymphoedema (BCRL). Objective: We aimed to compare the cell proliferative effects of a range of doses of LLLT at wavelengths of 780, 830 and 904 nm on human breast and immortalised human mammary epithelial cell lines in vitro. Materials and Methods: Human breast adenocarcinoma (MCF-7), human melanoma cell line (MDA-MB-435S/M14) 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 and 904 nm). MCF-7 cells were further irradiated with two and three exposures of all wavelengths. Cell proliferation was assessed 24 hours after irradiation. Results: SVCT cell proliferation significantly increased after exposure to a range of doses at 780 and 904 nm irradiation. MDA-MB-435S and Bre80hTERT cell lines showed negligible effects to LASER exposure. MCF-7 cells irradiated with 780 nm LASER demonstrated an increasing dose response relationship after one exposure and a decreasing dose response relationship after three exposures. MCF-7 cells irradiated with 904 nm LASER demonstrated a decreasing dose response relationship after two and three exposures. Conclusion: Although certain LASER doses increased MCF-7 cell proliferation, multiple exposures had no effect or a decreasing effect on dose response relationships. Before a definitive conclusion can be made regarding LASER safety for BCRL, further in vivo research is necessary.
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Conference Title
8th Australasian Lymphology Association Conference: Reflections on the past, Inspirations for the future
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Medical and Health Sciences not elsewhere classified