Oxidative stress and UV-induced photodamage pathways in skin

Oxidative stress and UV-induced photodamage pathways in skin encompass the molecular mechanisms by which ultraviolet radiation (UVR) causes premature skin aging and carcinogenesis. UVR exposure generates reactive oxygen species (ROS) that trigger signaling cascades, including the mitogen-activated protein kinase (MAPK) and nuclear factor-kappa B (NF-kB) pathways (Bickers & Athar, 2006). These pathways upregulate matrix metalloproteinases (MMPs), such as MMP-1, which degrade dermal collagen and elastin, leading to the structural changes characteristic of photoaging (Pandel et al., 2013). Concurrently, UVB radiation induces direct DNA lesions, specifically cyclobutane pyrimidine dimers (CPDs), which are precursors to mutations in genes like TP53 (Rastogi et al., 2010). Therapeutic interventions include topical antioxidants to neutralize ROS, retinoids to inhibit MMP expression and promote collagen synthesis, and sunscreens to prevent UV-induced damage. These pathways are central to dermatological research and the development of photoprotective and anti-aging formulations.

Other names

PhotoagingUV-induced skin damageOxidative skin agingSolar elastosisUV-induced oxidative stress

Pharmacological agents target these pathways through several mechanisms: UV filters physically or chemically block UV radiation; antioxidants scavenge reactive oxygen species (ROS) to prevent oxidative damage; retinoids modulate gene expression to inhibit matrix metalloproteinases (MMPs) and stimulate collagen synthesis; and DNA repair enzymes enhance the removal of UV-induced photoproducts (Pandel et al., 2013; Bickers & Athar, 2006).