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Jak/STAT signaling pathway regulates nox1 and nox4-based NADPH oxidase in human aortic smooth muscle cells

Adrian Manea1, Laurentia Irina Tanase, Monica Raicu

  • 1Institute of Cellular Biology and Pathology "Nicolae Simionescu," 8, BP Hasdeu St, Bucharest, PO Box 35-14, Romania.

Arteriosclerosis, Thrombosis, and Vascular Biology
|October 17, 2009
PubMed
Abstract

Insights

The JAK/STAT pathway regulates Nox1 and Nox4 in human aortic smooth muscle cells, impacting vascular disease. Inhibiting this pathway reduces oxidative stress, offering a potential therapeutic strategy for atherosclerosis.

Area of Science:

  • Vascular Biology
  • Molecular Medicine
  • Cell Signaling

Background:

  • Oxidative stress, driven by NADPH oxidase (Nox) enzymes like Nox1 and Nox4, is crucial in vascular diseases.
  • The precise molecular mechanisms regulating Nox enzymes remain incompletely understood.
  • The JAK/STAT pathway influences genes involved in inflammation, proliferation, and differentiation, prompting investigation into its role in Nox regulation.

Purpose of the Study:

  • To investigate the involvement of the JAK/STAT signaling pathway in the regulation of Nox1 and Nox4 in human aortic smooth muscle cells (SMCs).

Main Methods:

  • Human aortic SMCs were treated with interferon gamma (IFNγ).
  • Nox activity and expression were assessed using chemiluminescence assays, real-time PCR, and Western blotting.
  • In silico analysis, promoter activity assays, and chromatin immunoprecipitation identified STAT1/STAT3 binding sites and interactions within Nox gene promoters.

Main Results:

  • JAK/STAT inhibitors significantly reduced IFNγ-induced upregulation of Nox activity, Nox1, and Nox4 expression.
  • STAT1/STAT3 proteins physically interacted with conserved GAS elements in the Nox1 and Nox4 promoters.
  • JAK/STAT pathway blockade decreased the transcription of Nox subunits.

Conclusions:

  • The JAK/STAT pathway is a critical regulator of Nox1 and Nox4 in human vascular SMCs.
  • Targeting the JAK/STAT pathway and subsequent Nox-dependent oxidative stress presents a promising therapeutic approach for reducing atherogenesis.

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