Journal
CANCER LETTERS
Volume 554, Issue -, Pages -Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2022.216022
Keywords
NSCLC; SMARCA4 gene; SMARCA2 gene; SWI/SNF complex; Immunotherapy
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SMARCA4, a transcription activator, is an ATP-dependent catalytic subunit of SWI/SNF chromatin-remodeling complexes. It plays a role in regulating chromatin structure and gene expression and is a tumor suppressor in non-small-cell lung cancers (NSCLCs). NSCLC patients with SMARCA4 alterations have a poor response to chemotherapy and prognosis. This review summarizes the biological functions of SMARCA4, its role in NSCLC development, and potential therapeutic approaches.
SMARCA4, also known as transcription activator, is an ATP-dependent catalytic subunit of SWI/SNF (SWItch/Sucrose NonFermentable) chromatin-remodeling complexes that participates in the regulation of chromatin structure and gene expression by supplying energy. As a tumor suppressor that has aberrant expression in similar to 10% of non-small-cell lung cancers (NSCLCs), SMARCA4 possesses many biological functions, including regulating gene expression, differentiation and transcription. Furthermore, NSCLC patients with SMARCA4 alterations have a weak response to conventional chemotherapy and poor prognosis. Therefore, the mechanisms of SMARCA4 in NSCLC development urgently need to be explored to identify novel biomarkers and precise therapeutic strategies for this subtype. This review systematically describes the biological functions of SMARCA4 and its role in NSCLC development, metastasis, functional epigenetics and potential therapeutic approaches for NSCLCs with SMARCA4 alterations. Additionally, this paper explores the relationship and regulatory mechanisms shared by SMARCA4 and its mutually exclusive catalytic subunit SMARCA2. We aim to provide innovative treatment strategies and improve clinical outcomes for NSCLC patients with SMARCA4 alterations.
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