Keratinocyte apoptosis induced by ultraviolet B irradiation (null)

The entry "Keratinocyte proliferation reduction via DNA damage/apoptosis induction by UV-B irradiation" does not refer to a specific molecule or receptor, but rather describes a cellular process whereby exposure of skin cells—specifically keratinocytes—to ultraviolet B (UVB) radiation leads to DNA damage and triggers apoptosis. This mechanism serves as an important protective response against carcinogenesis by eliminating potentially mutated cells from the epidermis. The apoptotic pathway involves mitochondrial signaling, activation of caspases such as procaspase‑9 and downstream effectors, modulation by proteins including p53 and members of the Bcl‑2 family, and can be influenced by oxidative stress through reactive oxygen species production. Morphologically, affected keratinocytes become "sunburn cells," characterized by nuclear condensation and fragmentation. While critical for preventing tumor development after genotoxic insult from sunlight exposure, excessive induction may contribute to acute photodamage ("sunburn") and chronic photoaging. This entry should be flagged as incorrect for use as a canonical drug target because it does not represent an individual protein or receptor amenable to direct pharmacological intervention; instead it encompasses multiple pathways involved in programmed cell death following environmental injury.

Other names

UVB-induced keratinocyte apoptosisSunburn cell formationUVB-induced programmed cell death in keratinocytes

This entry refers to a biological effect rather than an actionable drug target. However, drugs that protect against UVB or enhance DNA repair could theoretically reduce this process.