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Photoaging

1072

Nicotinamide Prevents UVB- and Oxidative Stress‒Induced Photoaging in Human Primary Keratinocytes

Nicotinamide (NAM), a NAM adenine dinucleotide precursor, is known for its benefits to skin health. Under standard culture conditions, NAM delays the differentiation and enhances the proliferation of human primary keratinocytes, leading to the maintenance of stem cells. In this study, we investigated the effects of NAM on photoaging in two-dimensional human primary keratinocyte cultures […]
892

Nicotinamide Metabolism Modulates the Proliferation/Differentiation Balance and Senescence of Human Primary Keratinocytes

Nicotinamide (NAM) is the main precursor of nicotinamide adenine dinucleotide (NAD+), a coenzyme essential for DNA repair, glycolysis, and oxidative phosphorylation. NAM has anti-aging activity on human skin, but the underlying mechanisms of action are unclear. Using 3-dimensional organotypic skin models, we show that NAM inhibits differentiation of the upper epidermal layers and maintains proliferation […]
3119

Total Defense + Repair: A Novel Concept in Solar Protection and Skin Rejuvenation

For more than a century, solar radiation has been known to contribute Significantly to the extrinsic aging of skin. Until recently, this was almost exclusively attributed to the photodamage caused by ultraviolet (UV) light. However, a growing body of evidence now indicates that both infrared (IR) and visible light may also contribute to extrinsic skin aging. Infrared […]