The interaction between HER2 and aryl hydrocarbon receptor (AhR) signaling cascades during mammosphere formation of MCF-7 cells was studied. A newly established clonal MCF-7 cell line (HER2-5), stably overexpressing HER2, showed significantly enhanced levels of AhR mRNA and protein compared with MCF-7 cells. AhR was required for the HER2-mediated induction of interleukin-6 mRNA and for mammosphere formation in HER2-5 and MCF-7 cells. Mammosphere forming efficiency was suppressed by an AhR antagonist in a dose-dependent manner, as well as by knockdown of AhR. Taken together, these results indicate that AhR enhances mammosphere formation by human HER2-overexpressing breast cancer cells.
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| http://dx.doi.org/10.1016/j.canlet.2012.11.021 | DOI Listing |
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