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GATA3 Exerts Distinct Transcriptional Functions to Regulate Radiation Resistance in A549 and H1299 Cells

Rui Wang1, Junxuan Yi1, Hui Gao1,2

  • 1NHC Key Laboratory of Radiobiology, School of Public Health, Jilin University, Changchun, Jilin, China.

Oxidative Medicine and Cellular Longevity
|August 22, 2022
PubMed
Abstract

Insights

Transcription factor GATA3 impacts lung cancer cell radiation resistance through opposing mechanisms in different cell lines. Understanding GATA3

Area of Science:

  • Molecular Oncology
  • Cancer Cell Biology
  • Radiotherapy Research

Background:

  • Radiation resistance in lung cancer is a critical challenge impacting treatment efficacy.
  • Transcription factor GATA3 plays a role in cancer cell functions but its mechanism in lung cancer radioresistance is unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms of GATA3 in regulating lung cancer cell radiation resistance.
  • To investigate the relationship between GATA3, H3K4me3, and target gene expression in radioresistant lung cancer cells.

Main Methods:

  • Establishment and validation of radiation-resistant lung cancer cell models (A549-RR, H1299-RR).
  • GATA3 manipulation via transfection (knockdown/overexpression).
  • Chromatin immunoprecipitation (ChIP-qPCR, ChIP-seq), dual luciferase reporter assays, and xenograft tumor models were employed.

Main Results:

  • In A549 cells, GATA3 and H3K4me3 coactivate NRP1 transcription, contributing to radiation resistance.
  • In H1299 cells, GATA3 acts as a transcriptional inhibitor of NRP1, with decreased GATA3 increasing NRP1 transcription independently of H3K4me3.
  • GATA3 depletion affected tumorigenic behavior in vivo.

Conclusions:

  • GATA3 differentially regulates lung cancer cell radioresistance in A549 and H1299 cells via opposite mechanisms.
  • GATA3 is an upstream regulator of the NRP1 gene.
  • GATA3 presents a potential therapeutic target for enhancing lung cancer radiotherapy.

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