Putative chemopreventive molecules can increase Nrf2-regulated cell defense in some human cancer cell lines, resulting in resistance to common cytotoxic therapies

Cancer Chemotherapy and Pharmacology
Liangao HuGerald Batist

Abstract

Nrf2 is a key transcription factor, which induces a cytoprotective gene array. Nrf2 is regulated at the posttranslational level through proteasomal degradation through an interaction with the adapter protein Keap1. High levels of Nrf2, resulting from a loss of function mutation in Keap1, were reported in chemoresistant non-small cell lung cancer. We observed very low levels of Nrf2 and of Nrf2-regulated detoxification proteins as a frequent phenotype in the more chemosensitive breast cancer, and when engineering increased Nrf2 levels, we found resistance to both doxorubicin and paclitaxel. We here show that basal Nrf2 levels in different cell lines correlate with their respective sensitivity to a common cytotoxic chemotherapy. Nrf2 and its regulated genes and proteins are the targets of a major strategy in cancer prevention. Molecules that interfere with the Nrf2-Keap1-Cul3 protein-protein interactions result in higher levels of Nrf2. Both naturally occurring and synthetic molecules with this effect have been suggested as clinical chemopreventive agents, including molecules derived from cruciferous vegetables such as the isothiocyanate sulforaphane and even green tea polyphenols. Here, we determine the impact of these putative ...Continue Reading

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