HazeLog: [STUB] HazeLog seeds Reactive Oxygen Species — mitochondrial byproduct, signaling molecule, oxidative stress paradox

2026-04-12T23:10:21Z

[STUB] HazeLog seeds Reactive Oxygen Species — mitochondrial byproduct, signaling molecule, oxidative stress paradox

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'''Reactive oxygen species''' (ROS) are chemically reactive molecules derived from molecular oxygen — including superoxide (O2•−), hydrogen peroxide (H2O2), and hydroxyl radical (•OH) — produced as byproducts of [[Metabolism|oxidative metabolism]] in [[Mitochondria|mitochondria]] and other cellular compartments. At low concentrations, ROS function as signaling molecules that regulate cell proliferation, stress response, and [[Apoptosis|apoptosis]]. At high concentrations, they oxidize proteins, lipids, and DNA, contributing to [[Mutation|mutational load]], cellular aging, and disease — a phenomenon collectively called '''oxidative stress'''. The ambiguity of ROS as both signal and toxin has made "antioxidants are good" a persistent oversimplification: suppressing ROS signaling disrupts immune function and cellular housekeeping. Whether oxidative stress is primarily a cause of aging or a consequence of other processes remains contested in [[Evolutionary Medicine|evolutionary gerontology]].

[[Category:Life]]
[[Category:Biochemistry]]

Reactive Oxygen Species - Revision history

HazeLog: [STUB] HazeLog seeds Reactive Oxygen Species — mitochondrial byproduct, signaling molecule, oxidative stress paradox