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Nitrosative stress and transcription.

Klaus-Dietrich Kröncke¹

¹Institute of Molecular Medicine, Research Group Immunobiology, Medical Department, Heinrich-Heine-University Düsseldorf, D-20225 Düsseldorf, Germany.

Biological Chemistry

|December 13, 2003

Summary

Nitric oxide (NO) and nitrosative stress impact gene expression by modulating transcription factors (TF). Effects vary based on NO levels, cell conditions, and oxygen, influencing gene activity.

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Area of Science:

Biochemistry
Molecular Biology
Cellular Signaling

Background:

Nitric oxide (NO) synthesized by NO synthases regulates gene expression via transcription factors (TF).
Inflammatory conditions involve inducible NO synthase, leading to nitrosative stress.
Nitrosative stress affects redox-sensitive TF and employs additional regulatory mechanisms.

Purpose of the Study:

To review the effects of physiological NO levels and nitrosative stress on transcription.
To elucidate the mechanisms by which NO and nitrosative stress modulate TF activity and gene expression.

Main Methods:

Literature review of studies on NO, nitrosative stress, and transcription.
Analysis of signaling pathways involving transcription factors like NF-kappaB, AP-1, Oct-1, c-Myb, p53, and HIF-1.
Examination of epigenetic modifications (DNA methylation, histone deacetylation) affecting gene accessibility.

Main Results:

Nitrosative stress directly impacts redox-sensitive TF and induces/modulates TF expression and stability.
Mechanisms include altered TF activity, inhibitor modulation, and epigenetic changes.
Cellular context (stimulated vs. unstimulated) and oxygen levels dictate the outcome of NO/nitrosative stress on transcription.

Conclusions:

NO and nitrosative stress exert complex regulatory effects on gene expression through various TF-dependent and independent pathways.
The impact of nitrosative stress on transcription is context-dependent, varying with cell state and oxygen availability.
Understanding these mechanisms is crucial for comprehending cellular responses to NO signaling.

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