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• W2000889570 abstract "Objective This study investigates whether methylene blue (MB), patent blue V (PBV), and indigo carmine (IDC) commonly used in sentinel node biopsy cause DNA damage to breast epithelial cells in vitro. Methods MCF-7 and HB-2 cells were exposed for 5 minutes to the above dyes at the same concentrations used in clinical practice. Following exposure, the comet assay was performed to detect DNA damage. The enzyme, Fapy-DNA glycosylase (FpG) was incorporated to enable the detection of additional oxidative damage. Results Both PBV and MB stimulated DNA strand breaks in both MCF-7 and HB2 cell lines (P < 0.05). Levels were elevated over 3-fold (P < 0.05) in MCF-7 and HB2 cells treated with 2.5% PBV and 1% MB, compared with untreated control cells. In contrast, IDC did not stimulate DNA strand break damage at clinically relevant concentrations in either cell line. Addition of Fapy-DNA glycosylase enzyme also revealed significantly (P < 0.05) increased levels of oxidative DNA lesions (ODL) in MCF-7 cells treated with PBV (17.6% ODL) compared with control cells (5.9% ODL). Conclusions This study shows, for the first time, that certain dyes (MB and PBV) commonly used in SLNB have genotoxic effects on breast cells at clinically relevant concentrations in vitro. In vivo studies are now warranted to assess and minimize DNA damage caused by these dyes during SLNB. This study investigates whether methylene blue (MB), patent blue V (PBV), and indigo carmine (IDC) commonly used in sentinel node biopsy cause DNA damage to breast epithelial cells in vitro. MCF-7 and HB-2 cells were exposed for 5 minutes to the above dyes at the same concentrations used in clinical practice. Following exposure, the comet assay was performed to detect DNA damage. The enzyme, Fapy-DNA glycosylase (FpG) was incorporated to enable the detection of additional oxidative damage. Both PBV and MB stimulated DNA strand breaks in both MCF-7 and HB2 cell lines (P < 0.05). Levels were elevated over 3-fold (P < 0.05) in MCF-7 and HB2 cells treated with 2.5% PBV and 1% MB, compared with untreated control cells. In contrast, IDC did not stimulate DNA strand break damage at clinically relevant concentrations in either cell line. Addition of Fapy-DNA glycosylase enzyme also revealed significantly (P < 0.05) increased levels of oxidative DNA lesions (ODL) in MCF-7 cells treated with PBV (17.6% ODL) compared with control cells (5.9% ODL). This study shows, for the first time, that certain dyes (MB and PBV) commonly used in SLNB have genotoxic effects on breast cells at clinically relevant concentrations in vitro. In vivo studies are now warranted to assess and minimize DNA damage caused by these dyes during SLNB." @default.
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• W2000889570 date "2009-06-01" @default.
• W2000889570 modified "2023-09-26" @default.
• W2000889570 title "DNA Damaging Effects of the Dyes Used in Sentinel Node Biopsy: Possible Implications for Clinical Practice" @default.
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• W2000889570 doi "https://doi.org/10.1016/j.jss.2008.07.039" @default.
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