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Analysis of Oxidative Stress in Zebrafish Embryos
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Oxidative Stress.

Helmut Sies1,2, Carsten Berndt3, Dean P Jones4

  • 1Institute of Biochemistry and Molecular Biology I, Heinrich Heine University, Düsseldorf, University, D-40225, Düsseldorf, Germany;

Annual Review of Biochemistry
|April 26, 2017
PubMed
Summary
This summary is machine-generated.

Oxidative stress has dual roles: damaging at high levels but essential for life processes via redox signaling at physiological levels. Maintaining redox balance involves complex molecular pathways and signaling molecules.

Keywords:
antioxidantshydrogen peroxideoxidantsoxidative damageredox signalingredox state

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Analyzing Oxidative Stress in Murine Intestinal Organoids using Reactive Oxygen Species-Sensitive Fluorogenic Probe
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Nutritional Sciences
  • Environmental Medicine
  • Redox Medicine

Background:

  • Oxidative stress presents a dichotomy: excessive levels damage biomolecules, while physiological levels (oxidative eustress) are crucial for life processes via redox signaling.
  • Redox signaling integrates these opposing properties, with balance maintained through prevention, interception, and repair mechanisms.
  • Key molecular thiol-driven switches like Nrf2/Keap1 and NF-κB/IκB regulate system-wide oxidative stress responses.

Purpose of the Study:

  • To explore the intricate mechanisms by which redox signaling integrates the dual properties of oxidative stress.
  • To highlight the role of nonradical species, such as hydrogen peroxide (H2O2), as critical second messengers.
  • To underscore the importance of various cellular sources and pathways in fine-tuning physiological redox signaling.

Main Methods:

  • Review of biochemical and molecular mechanisms governing redox balance.
  • Analysis of signaling pathways involving thiol-driven master switches (Nrf2/Keap1, NF-κB/IκB).
  • Identification of key sources and mediators of reactive oxygen species (ROS) in physiological signaling.

Main Results:

  • Physiological levels of oxidative stress (eustress) are essential for regulating life processes through redox signaling.
  • Nonradical species (e.g., H2O2) play significant second messenger roles, distinct from free radicals.
  • NADPH oxidases and mitochondrial sources of H2O2, alongside glutathione and thioredoxin pathways, are crucial for fine-tuning redox signaling.

Conclusions:

  • Redox balance is actively maintained by a sophisticated network of molecular pathways.
  • Understanding redox signaling is vital for fields ranging from cell biology to environmental medicine and redox medicine.
  • The intricate interplay between oxidative stress and redox signaling offers a rich area for continued scientific investigation.