Integration of hydrogen peroxide sensing and detoxification by the C. elegans nervous system.

C. elegans nervous system detects and responds to environmental H2O2 through 24 neuron classes that encode stimulus intensity and exposure history.

• Why it matters: Understanding how organisms sense and react to reactive chemicals like H2O2 is crucial for insights into cellular defense and neurodegeneration, yet the neural circuits involved are not fully known.
• What they did: Researchers mapped the neural circuit in C. elegans involving sensory neurons that respond to H2O2 via oxidation of PRDX-2 and activation of LITE-1 and GUR-3 channels, leading to calcium influx and organism-wide escape responses.
• The result: The findings suggest that neuronal activity changes related to aging and neurodegenerative diseases may stem from altered peroxiredoxin-mediated H2O2 signaling rather than solely from direct oxidative damage.