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Published on: January 12, 2020
Nrf2 and Notch Signaling in Lung Cancer: Near the Crossroad
Angelo Sparaneo1, Federico Pio Fabrizio1, Lucia Anna Muscarella1
1Laboratory of Oncology, IRCCS "Casa Sollievo della Sofferenza" Hospital, San Giovanni Rotondo, Italy.
Abstract:
The transcription factor Nrf2 (NF-E2 related factor 2) is a master regulator of the cell antioxidant response associated with tumor growth and resistance to cytotoxic treatments. In particular, Nrf2 induces upregulation of cytoprotective genes by interacting with the closely situated AREs (Antioxidant Response Elements) in response to endogenous or exogenous stress stimuli and takes part to several oncogenic signaling pathways. Among these, the crosstalk with Notch pathway has been shown to enhance cytoprotection and maintenance of cellular homeostasis, tissue organization by modulating cell proliferation kinetics, and stem cell self-renewal in several organs. The role of Notch and Nrf2 related pathways in tumorigenesis is highly variable and when they are both abnormally activated they can synergistically cause neoplastic proliferation by promoting cell survival, differentiation, invasion, and metastases. NFE2L2, KEAP1, and NOTCH genes family appear in the list of significantly mutated genes in tumors in both combined and individual sets, supporting the crucial role that the aberrant Nrf2-Notch crosstalk might have in cancerogenesis. In this review, we summarize current knowledge about the alterations of Nrf2 and Notch pathways and their reciprocal transcriptional regulation throughout tumorigenesis and progression of lung tumors, supporting the potentiality of putative biomarkers and therapeutic targets.
Insights
The transcription factor Nrf2 and Notch pathway crosstalk promotes cancer growth and treatment resistance. Aberrant activation of these pathways, particularly in lung tumors, highlights their role in cancer development and suggests potential therapeutic targets.
Area of Science:
- Oncology
- Molecular Biology
- Cellular Signaling
Background:
- Nuclear factor erythroid 2-related factor 2 (Nrf2) regulates cellular antioxidant responses and is implicated in tumor progression and treatment resistance.
- Nrf2 interacts with Antioxidant Response Elements (AREs) to upregulate cytoprotective genes under stress.
- The Notch pathway influences cell proliferation, homeostasis, and stem cell self-renewal, and its crosstalk with Nrf2 is significant in tumorigenesis.
Purpose of the Study:
- To review the current understanding of Nrf2 and Notch pathway alterations in lung tumorigenesis.
- To explore the reciprocal transcriptional regulation between Nrf2 and Notch during cancer development.
- To identify potential biomarkers and therapeutic targets based on Nrf2-Notch pathway dysregulation.
Main Methods:
- Literature review of scientific articles focusing on Nrf2, Notch pathways, and lung cancer.
- Analysis of gene mutation data for NFE2L2, KEAP1, and NOTCH families in tumor datasets.
- Synthesis of information on the functional interplay between Nrf2 and Notch signaling in cancer.
Main Results:
- Both Nrf2 and Notch pathways are frequently altered in various cancers, including lung tumors.
- Aberrant activation of Nrf2 and Notch signaling can synergistically promote neoplastic proliferation, invasion, and metastasis.
- Mutations in NFE2L2, KEAP1, and NOTCH genes support the critical role of their crosstalk in cancerogenesis.
Conclusions:
- The aberrant crosstalk between Nrf2 and Notch pathways plays a significant role in lung tumorigenesis and progression.
- Understanding these pathway interactions is crucial for developing novel therapeutic strategies.
- Nrf2 and Notch pathway components represent promising targets for cancer biomarkers and treatments.
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