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Bioengineered NRF2-siRNA Is Effective to Interfere with NRF2 Pathways and Improve Chemosensitivity of Human Cancer

Peng-Cheng Li1, Mei-Juan Tu1, Pui Yan Ho1

  • 1Department of Orthopedics, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, China (P.-C.L., A.-X.Y.) and Department of Biochemistry and Molecular Medicine, Comprehensive Cancer Center, UC Davis School of Medicine, Sacramento, California (P.-C.L., M.-J.T., P.Y.H., J.L.J., Z.D., Q.-Y.Z., A.-M.Y.).

Drug Metabolism and Disposition: the Biological Fate of Chemicals
|October 25, 2017
PubMed

Insights

Bioengineered siRNA targeting nuclear factor (erythroid-derived 2)-like 2 (NRF2) effectively reduced NRF2 levels in osteosarcoma cells. This approach enhanced cancer cell sensitivity to chemotherapy drugs.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Biotechnology

Background:

  • Nuclear factor (erythroid-derived 2)-like 2 (NRF2) is a transcription factor regulating oxidative stress and xenobiotic defense.
  • NRF2 dysregulation is observed in osteosarcoma (OS) and impacts therapeutic outcomes.
  • Current research on NRF2 therapeutic targeting is limited by synthetic small interfering RNA (siRNA) modifications.

Purpose of the Study:

  • To develop and characterize bioengineered NRF2-siRNA produced in Escherichia coli.
  • To evaluate the efficacy of recombinant NRF2-siRNA in osteosarcoma cells.
  • To assess the potential of targeting NRF2 to improve chemotherapy sensitivity in OS.

Main Methods:

  • High-level expression and purification of recombinant NRF2-siRNA in E. coli.
  • Anion-exchange fast protein liquid chromatography for siRNA purification (>99% homogeneity).
  • In vitro assessment of NRF2 knockdown, downstream target gene expression, and cellular responses in OS cells.

Main Results:

  • Bioengineered NRF2-siRNA significantly reduced NRF2 mRNA and protein levels in human OS cells.
  • Suppressed expression of NRF2-regulated oxidative enzymes (HO-1, NQO1) and increased reactive oxygen species.
  • Enhanced sensitivity of OS cells to doxorubicin, cisplatin, and sorafenib via NRF2 and ABC transporter downregulation.

Conclusions:

  • Targeting NRF2 signaling pathways can potentially improve cancer cell sensitivity to chemotherapy.
  • Bioengineered siRNA represents a valuable tool for NRF2-related research and therapeutic development in osteosarcoma.

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