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[Expression of novel environmental responsive protein JWA involved in the oxidative stress responsiveness in MCF-7

Ting Zhu1, Rui Chen, Ai-ping Li

  • 1Department of Molecular Cell Biology & Toxicology, Jiangsu Provincial Key Laboratories of Human Functional Genomics and of Applied Toxicology, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province 210029, China.

Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi = Zhonghua Laodong Weisheng Zhiyebing Zazhi = Chinese Journal of Industrial Hygiene and Occupational Diseases
|August 18, 2005
PubMed
Abstract

Insights

JWA protein enhances cellular defense against hydrogen peroxide-induced oxidative stress in human breast cancer cells. It acts similarly to heat shock protein 70, suggesting a role in cellular protection pathways.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Oxidative stress is a key factor in cellular damage and disease.
  • Heat shock proteins (HSPs) play crucial roles in cellular protection and stress response.
  • The role of JWA protein in oxidative stress is not fully understood.

Purpose of the Study:

  • To investigate the expression and function of JWA protein in MCF-7 cells under oxidative stress.
  • To explore the relationship between JWA and heat shock proteins (HSPs) during oxidative damage.

Main Methods:

  • MCF-7 cells were treated with varying concentrations and durations of hydrogen peroxide (H2O2).
  • DNA damage was assessed using DNA gel electrophoresis.
  • Cell viability and proliferation were analyzed using the MTT assay.
  • Protein expression levels of JWA, HSP70, HSP27, and HSF1 were quantified via Western blot.

Main Results:

  • Hydrogen peroxide exposure induced dose- and time-dependent cytotoxicity and inhibited MCF-7 cell proliferation.
  • Oxidative stress upregulated JWA, HSP70, and heat shock factor 1 (HSF1) expression in a dose-dependent manner.
  • JWA expression patterns closely mirrored those of HSP70 and HSF1, but not HSP27.

Conclusions:

  • JWA protein may bolster intracellular defenses against H2O2-induced oxidative damage in human breast carcinoma cells.
  • JWA functions as an environmental-responsive protein, participating alongside HSP70 in oxidative damage signaling pathways.
  • HSF1 may regulate the involvement of JWA in these stress response pathways.

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