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Reactive oxygen intermediates involved in cellular regulation
1Tierärztliche Hochschule, Hannover, Federal Republic of Germany.
Abstract:
Reactive oxygen intermediates (ROIs) in low concentration, as released permanently by nonphagocytic cells, possess important functions in inter- and intracellular signalling. They lead to alterations in the phosphorylation pattern followed by gene activation, including the expression of proto-oncogenes. Redox-sensitive sites in membrane molecules may trigger adhesion and chemotaxis or open ion channels and activate transport processes across the cytoplasma membrane. ROIs shift the ratio of cyclic GMP to cyclic AMP giving signals to proliferation and differentiation processes. Senescence, apoptosis, and cell death can also be modulated by ROIs, depending on concentration and cell type.
Insights
Low concentrations of reactive oxygen intermediates (ROIs) from nonphagocytic cells are crucial for cell signaling, influencing gene activation and cell fate processes like proliferation and apoptosis.
Area of Science:
- Cellular biology
- Biochemistry
- Signaling pathways
Background:
- Reactive oxygen intermediates (ROIs) are continuously released by nonphagocytic cells.
- These molecules play significant roles in cellular communication.
Purpose of the Study:
- To elucidate the multifaceted roles of low-concentration ROIs in cellular signaling.
- To understand how ROIs influence gene expression and cellular processes.
Main Methods:
- Analysis of signaling pathways affected by ROIs.
- Investigation of gene activation and expression patterns.
- Examination of membrane molecule redox-sensitive sites.
Main Results:
- ROIs modulate phosphorylation patterns, leading to gene activation, including proto-oncogenes.
- Redox-sensitive membrane sites are influenced, affecting cell adhesion, chemotaxis, ion transport, and transmembrane processes.
- ROIs alter cyclic nucleotide ratios, impacting proliferation and differentiation.
- Cellular processes like senescence, apoptosis, and cell death are modulated by ROIs.
Conclusions:
- Low-concentration ROIs are critical signaling molecules with diverse cellular functions.
- ROIs impact gene expression, cell behavior, and cell fate determination.
- The effects of ROIs are concentration- and cell-type dependent.