Free radical formation leading to oxidative damage (null)

Free radical formation leading to oxidative damage refers not to a single molecular target but rather a pathological biochemical process. Free radicals—highly reactive molecules with unpaired electrons—are generated endogenously during normal metabolism or introduced via environmental exposures. When their production exceeds the capacity of antioxidant defense systems, they cause oxidative stress, damaging lipids, proteins, nucleic acids, and other cellular components through chain reactions. This leads to cell dysfunction or death and contributes significantly to diseases such as cancer, neurodegeneration, cardiovascular disorders, diabetes mellitus, atherosclerosis—and is implicated in aging itself. The body counters these effects using both enzymatic antioxidants like superoxide dismutase/catalase/glutathione peroxidase and nonenzymatic antioxidants from diet or supplements. While many drugs aim to reduce this type of cellular injury by scavenging free radicals or boosting endogenous defenses (“antioxidants”), translating these strategies into effective therapies has proven challenging due to complexity in redox biology.

Other names

Free radical-induced oxidative stressOxidative stress from free radicalsReactive oxygen species-mediated damageROS/RNS-induced cellular injury

Drugs targeting this process generally act by one or more of the following mechanisms: - Scavenging free radicals directly by donating electrons without becoming reactive themselves (antioxidants) - Enhancing endogenous antioxidant enzyme activity (e.g., upregulating superoxide dismutase, catalase, glutathione peroxidase) - Chelating redox-active metals to prevent catalytic generation of new radicals