Anti-aging and Cosmetology
Aging and skin issues arise from the combined effects of multiple factors, involving core mechanisms such as collagen loss, oxidative stress damage, melanin deposition, telomere shortening, and decline in cellular energy metabolism. Peptide substances, as bioactive molecules, exhibit unique advantages in wrinkle reduction, melanin regulation, telomere protection, antioxidation, and skin whitening due to their high target specificity and biocompatibility. By mimicking natural peptides or optimizing molecular structures, these components precisely intervene in skin aging pathways, repairing damage at the cellular level and reshaping youthful skin texture, thus providing innovative solutions for precision anti-aging and medical cosmetology.
Figure 1 Aging drivers and age-related diseases. Source: Molecular mechanisms of aging and anti-aging strategies (2024).
Core Application Areas
1. Wrinkle Reduction: Reshaping Dermal Structure and Elasticity
Skin wrinkle formation is closely associated with dermal collagen loss, elastic fiber rupture, and fibroblast dysfunction. Peptide products improve wrinkles by activating collagen synthesis pathways and inhibiting matrix degrading enzyme activity.
Promoting collagen synthesis
Specific oligopeptides mimic transforming growth factor-β (TGF-β) signaling, stimulating fibroblasts to synthesize type I and III collagen and hyaluronic acid. This increases dermal thickness and improves static wrinkles (e.g., forehead lines, nasolabial folds).
Regulating neuromuscular transmission
Certain peptides (e.g., Snap-8) inhibit the formation of presynaptic SNARE protein complexes, reducing acetylcholine release and weakening the contraction amplitude of facial expression muscles. This alleviates dynamic wrinkles (e.g., glabellar lines, crow’s feet), with effects comparable to botulinum toxin but greater reversibility and safety.
Extracellular matrix repair
Peptides such as GHK-Cu promote glycosaminoglycan synthesis, enhance dermal water retention, and accelerate the repair of damaged collagen fibers, improving skin elasticity and smoothness.
2. Melanin Regulation: Balancing Pigment Production and Metabolism
Abnormal melanin deposition leading to pigmentation (e.g., melasma, sunspots) is a challenge in cosmetology. Peptide substances achieve uniform skin tone through bidirectional regulation of melanocyte function.
Inhibiting melanin synthesis
Specific oligopeptides suppress tyrosinase activity and mRNA expression, reducing the conversion of dopaquinone to melanin; glutathione (GSH) scavenges free radicals through antioxidation, blocking intracellular oxidative reactions in melanocytes while promoting melanin granule degradation and excretion.
Photoprotection and tanning regulation
Peptides such as Melanotan-1/-2 act as melanocyte-stimulating hormone analogs to activate MC1R receptors, promoting melanin synthesis and distribution. This enhances skin defense against ultraviolet (UV) radiation, reduces photodamage risk, and achieves physiological tanning to avoid DNA damage from direct UV exposure.
3. Telomere Protection: Slowing Cellular Aging Processes
Telomere shortening is a biological marker of cellular aging, and telomere peptides extend cell lifespan by regulating telomerase activity.
Regulating telomerase activity
Peptides such as Epi target nuclear telomere regions, activating the expression of telomerase catalytic subunit (TERT) to slow telomere shortening and delay the aging of fibroblasts and keratinocytes, thereby maintaining skin renewal capacity. These peptides increase cell division cycles and improve skin barrier function and water retention.
Regulating gene expression
By modulating aging-related genes such as p53 and p16, telomere peptides inhibit cell cycle arrest and reduce the release of pro-inflammatory factors from the senescence-associated secretory phenotype (SASP), suppressing the cascade of skin aging from its origin.
Figure 2 Telomere and telomerase structure, and their relationship with cell senescence. Source: Molecular mechanisms of aging and anti-aging strategies (2024).
4. Antioxidation: Scavenging Free Radicals and Protecting Cellular Structure
Oxidative stress is a primary inducer of skin aging, and peptide substances exert protective effects through multi-target antioxidation.
Free radical scavenging
Precursor peptides such as NAD enhance cellular energy metabolism, boost the activity of antioxidant enzymes like SOD and CAT, and reduce damage from superoxide anions and hydrogen peroxide; glutathione directly neutralizes free radicals, protecting cell membrane lipids and DNA from oxidative damage.
Mitochondrial protection
Peptides such as SS-31 embed in the mitochondrial inner membrane, inhibiting cytochrome C release and apoptosis pathway activation, maintaining mitochondrial membrane potential, and ensuring stable energy supply. This reduces oxidative stress-induced keratinocyte apoptosis and dermal collagen degradation.
5.Skin Whitening: Multi-pathway Synergy for Skin Tone Evenness
Whitening requires not only melanin inhibition but also comprehensive regulation of pigment transport, metabolism, and the skin barrier.
Inhibiting melanin transport
Certain peptide products block the transfer of melanin granules from melanocytes to keratinocytes, reducing epidermal pigment deposition; they also enhance stratum corneum metabolism, accelerating the exfoliation of melanin-containing keratinocytes.
Intervening in post-inflammatory hyperpigmentation
Peptides such as KPV inhibit the NF-κB inflammatory pathway, reducing UV- or inflammation-induced excessive melanin production. This is particularly suitable for repairing pigmentation in sensitive skin and post-acne lesions.
The application of peptide substances in anti-aging and cosmetology marks a scientific leap from "surface modification" to "mechanistic intervention." By targeting collagen synthesis, melanin metabolism, telomere protection, oxidative stress, and cellular energy pathways, these components enable multidimensional intervention in skin aging.