Skin aging from mechanisms to interventions: focusing on dermal aging

Area of Science:

• Dermatology
• Cellular Biology
• Biochemistry

Background:

• Skin aging is a complex biological process driven by intrinsic (programmed aging, cellular senescence) and extrinsic (UV radiation, pollution) factors.
• Both intrinsic and extrinsic aging contribute to oxidative stress, DNA damage, and cellular dysfunction, leading to visible skin changes.
• Accumulation of senescent cells in aged skin degrades the extracellular matrix, exacerbating the aging phenotype.

Purpose of the Study:

• To provide a comprehensive overview of the multifaceted mechanisms underlying skin aging.
• To elucidate the roles of intrinsic and extrinsic factors in cellular senescence and extracellular matrix degradation.
• To highlight the importance of understanding aging mechanisms for developing effective anti-aging strategies.

Main Methods:

• This review synthesizes current scientific literature on skin aging.
• It examines the molecular and cellular pathways involved in intrinsic and extrinsic aging processes.
• The review discusses established and emerging anti-aging interventions in relation to these mechanisms.

Main Results:

• Intrinsic aging involves programmed senescence and endogenous damage, while extrinsic aging is driven by environmental aggressors like UV radiation.
• Both aging types lead to reactive oxygen species production, DNA damage, and accumulation of senescent cells.
• Senescent cells actively contribute to extracellular matrix degradation, accelerating skin aging.

Conclusions:

• A thorough understanding of skin aging mechanisms, including cellular senescence and matrix remodeling, is crucial for effective treatment development.
• Current anti-aging treatments like chemical peels, injectables, and energy-based devices target specific aging symptoms.
• Future anti-aging protocols require a mechanism-based approach integrating knowledge of intrinsic and extrinsic aging pathways for optimal outcomes.