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Potential Role of Nrf2, HER2, and ALDH in Cancer Stem Cells: A Narrative Review

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Abstract

Cancer is one of the main causes of death among humans, second only to cardiovascular diseases. In recent years, numerous studies have been conducted on the pathophysiology of cancer, and it has been established that this disease is developed by a group of stem cells known as cancer stem cells (CSCs). Thus, cancer is considered a stem cell disease; however, there is no comprehensive consensus about the characteristics of these cells. Several different signaling pathways including Notch, Hedgehog, transforming growth factor-β (TGF-β), and WNT/β-catenin pathways cause the self-renewal of CSCs. CSCs change their metabolic pathways in order to access easy energy. Therefore, one of the key objectives of researchers in cancer treatment is to destroy CSCs. Nuclear factor erythroid 2-related factor 2 (Nrf2) plays an essential role in the protection of CSCs from reactive oxygen species (ROS) and chemotherapeutic agents by regulating antioxidants and detoxification enzymes. Human epidermal growth factor receptor 2 (HER2) is a member of the tyrosine kinase receptor family, which contributes to the protection of cancer cells against treatment and implicated in the invasion, epithelial-mesenchymal transition (EMT), and tumorigenesis. Aldehyde dehydrogenases (ALDHs) are highly active in CSCs and protect the cells against damage caused by active aldehydes through the regulation of aldehyde metabolism. On the other hand, ALDHs promote the formation and maintenance of tumor cells and lead to drug resistance in tumors through the activation of various signaling pathways, such as the ALDH1A1/HIF-1α/VEGF axis and Wnt/β-catenin, as well as changing the intracellular pH value. Given the growing body of information in this field, in the present narrative review, we attempted to shed light on the function of Nrf2, HER2, and ALDH in CSCs.

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Acknowledgements

The authors would like to thank Urmia University of Medical Sciences for their support of this research.

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The authors declare that the study had no funding.

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A. F., S. T., and S. P. were involved in data collection. M. S., M. Q., and M. H. were involved in writing the article and drawing the figures. A. N. was involved in revising. M. V. participated in the study design.

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Correspondence to Mohammad Valilo.

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Fakhrioliaei, A., Tanhaei, S., Pakmehr, S. et al. Potential Role of Nrf2, HER2, and ALDH in Cancer Stem Cells: A Narrative Review. J Membrane Biol 257, 3–16 (2024). https://doi.org/10.1007/s00232-024-00307-2

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  • DOI: https://doi.org/10.1007/s00232-024-00307-2

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