Oxidative Stress and Skin Aging Mechanisms

Skin ageing arises from the interplay of intrinsic factors, such as cellular metabolism and telomere attrition, and extrinsic factors, notably ultraviolet (UV) radiation and environmental pollutants. Central to these processes is oxidative stress, defined by an excess of reactive oxygen species (ROS) over antioxidant defences. ROS originate from normal mitochondrial respiration, enzyme‐catalysed reactions and UV‐induced photochemical events. Elevated ROS levels damage lipids, proteins and DNA, triggering signalling cascades that up‐regulate matrix metalloproteinases (MMPs) and inflammatory mediators. MMPs degrade collagen and other extracellular matrix (ECM) components, compromising the dermal scaffold and reducing skin elasticity. Oxidative lesions can also induce cellular senescence and impair epidermal stem cell function, while dysregulation of barrier proteins such as filaggrin exacerbates dryness and susceptibility to irritants. Over time, these molecular changes manifest as wrinkles, loss of firmness, pigmentary irregularities and impaired repair capacity. Understanding the mechanistic links between ROS generation, ECM remodelling and barrier dysfunction underpins strategies to delay or reverse skin ageing.

Research from Nature Portfolio

Recent studies have demonstrated that consumer‐grade ultraviolet devices can generate high levels of ROS in skin cells, leading to characteristic oxidative DNA lesions and mutations akin to those seen in ageing tissues. Investigations into particulate air pollution reveal that fine particles activate the aryl hydrocarbon receptor (AhR), stimulating NADPH oxidase‐mediated ROS production. The ensuing oxidative cascade engages mitogen‐activated protein kinases (MAPKs) and transcription factors such as NF-κB and AP-1, culminating in COX-2 up-regulation and filaggrin down-regulation. These findings highlight underappreciated sources of oxidative burden and identify receptor‐mediated pathways that link environmental stressors to barrier impairment and accelerated cutaneous ageing.

Oxidative Stress and Skin Aging Mechanisms publication trend

The graph below shows the total number of articles in oxidative stress and skin aging mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen that can damage cellular components when in excess.

Matrix metalloproteinases (MMPs): A family of zinc‐dependent enzymes that degrade extracellular matrix proteins, including collagen and elastin.

Extracellular matrix (ECM): A network of structural proteins and glycoproteins that provides mechanical support to skin tissues.

Filaggrin: An epidermal protein essential for barrier formation and hydration; its reduction compromises skin resilience.

Aryl hydrocarbon receptor (AhR): A ligand‐activated transcription factor that senses environmental chemicals and regulates oxidative and inflammatory responses.

NADPH oxidase: An enzyme complex that produces ROS by transferring electrons from NADPH to oxygen, often activated by environmental stimuli.

References

1. Skin protection from solar ultraviolet radiation using natural compounds: a review. Environmental Chemistry Letters (2023).
2. DNA damage and somatic mutations in mammalian cells after irradiation with a nail polish dryer. Nature Communications (2023).
3. Environmental Stressors on Skin Aging. Mechanistic Insights. Frontiers in Pharmacology (2019).
4. Urban particulate matter down-regulates filaggrin via COX2 expression/PGE2 production leading to skin barrier dysfunction. Scientific Reports (2016).
5. Oxidative Stress in Aging Human Skin. Biomolecules (2015).
6. Mechanisms of Photoaging and Cutaneous Photocarcinogenesis, and Photoprotective Strategies with Phytochemicals. Antioxidants (2015).
7. Ultraviolet Radiation‐Induced Skin Aging: The Role of DNA Damage and Oxidative Stress in Epidermal Stem Cell Damage Mediated Skin Aging. Stem Cells International (2016).
8. Molecular Mechanisms of Dermal Aging and Antiaging Approaches. International Journal of Molecular Sciences (2019).