Activating NRF2^E79Q mutation alters the differentiation of human non-small cell lung cancer

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• The Nuclear factor erythroid 2-related factor 2 (NRF2) signaling pathway is implicated in tumor initiation, progression, and therapeutic resistance.
• NRF2-active tumors exhibit altered metabolism, redox state, and immunosuppression.

Purpose of the Study:

• To investigate the molecular and phenotypic effects of NRF2 activation in two distinct human non-small cell lung cancer (NSCLC) models.
• To understand the context-dependent impact of NRF2 on NSCLC growth and differentiation.

Main Methods:

• Utilized inducible expression of a common activating NRF2 mutation (NRF2^E79Q) in H358 (lung adenocarcinoma) and H596 (lung adeno-squamous cell carcinoma) NSCLC cell lines.
• Assessed impacts on cellular morphology, tumor growth (2D culture and xenografts), and gene expression profiles.
• Compared NRF2-induced transcriptional programs with those in primary lung tumors.

Main Results:

• NRF2^E79Q expression altered cellular morphology in both NSCLC models.
• In H358 cells, NRF2 activation increased xenograft tumor growth but not in 2D culture.
• In H596 cells, NRF2 activation increased neuroendocrine marker gene expression without affecting tumor growth in either 2D or xenografts.
• Gene expression profiling identified shared and unique NRF2 transcriptional programs, with some overlap in primary lung tumors.

Conclusions:

• NRF2 activation exerts context-dependent effects on NSCLC cell growth and differentiation.
• NRF2 plays a role in modulating the differentiation state of human NSCLC during tumor progression.