Photoaging: Update on Pathogenesis, Prevention, and Treatment

Area of Science:

• Dermatology
• Molecular Biology
• Biochemistry

Background:

• Skin aging results from intrinsic processes and extrinsic factors like sun exposure (photoaging).
• Photoaging clinically manifests as wrinkles and pigmentary changes.
• Topical tretinoin was the first reported treatment for photoaged skin.

Purpose of the Study:

• To provide a mechanism-driven review of photoaging development, manifestations, and treatments.
• To discuss both traditional and newly discovered molecular pathways involved in photoaging.
• To cover treatment strategies for diverse skin types.

Main Methods:

• Narrative review of existing literature.
• Focus on mechanism-driven insights into photoaging.
• Discussion of signaling pathways, molecular players, and treatment efficacy.

Main Results:

• Ultraviolet radiation induces extracellular matrix degradation.
• Key signaling pathways include aryl hydrocarbon receptor, matrix metalloproteinase-2, and nuclear factor erythroid 2-related factor.
• Skin of color shows increased susceptibility to pigmentary alterations.

Conclusions:

• Photoaging involves complex molecular signaling beyond ECM degradation.
• Understanding these mechanisms is crucial for effective treatment development.
• Comprehensive management includes photoprotection and diverse therapeutic options.