Skin ageing and its treatment

Promoting collagen synthesis: a viable strategy to combat skin ageing

Skin ageing is a complex physiological process primarily characterised by the deepening of wrinkles and the sagging of the skin. Collagen is essential for maintaining skin elasticity and firmness. As skin ages, it experiences structural and functional changes in collagen, including a decrease in collagen synthesis and an increase in collagen hydrolysis. Thus, promoting collagen synthesis represents a practical strategy for mitigating skin ageing. This review systematically described the functions, classifications and biosynthesis process of collagen, as well as its role in skin ageing. Additionally, the major signalling pathways and targets associated with collagen synthesis were also discussed. More importantly, the review provided a detailed summary of natural products with collagen synthesis-promoting effects and highlighted small molecule compounds with potential anti-ageing activity, especially PPARδ agonists. The relevant content offers potential targets and lead compounds for the development of anti-skin ageing therapies.

Micro-Focused Ultrasound Technology for Remodeling of Skin Tissue Architecture in an Animal Model

BACKGROUND

As a novel clinical therapeutic technique, micro-focused ultrasound (MFU) has garnered significant attention in the field of skin rejuvenation in recent years. Although clinical studies have demonstrated the marked efficacy of MFU in improving skin laxity, the specific histological and molecular mechanisms of its rejuvenation effects on the skin remain unclear.

METHODS

The abdominal skin of Bama minipigs was treated with MFU, specific treatment parameters employed both the 3 mm and 4.5 mm therapeutic head with the following settings: 25 Hz/1 min/6.63 W, 25 Hz/2.5 min/6.63 W, 25 Hz/1 min/1.32 W, and 10 Hz/1 min/6.63 W, with adjacent areas serving as controls. The thickness of the dermis, fat layer, and superficial musculoaponeurotic system (SMAS) layer was measured by ultrasound imaging at baseline, immediately after treatment, and at 14, 30, 90 days posttreatment. The histopathological, immunohistochemical, and transcriptomic changes of each time point were studied, to compare protein content and gene expression of matrix metalloproteinase (MMP) enzymes, transforming growth factor β (TGF-β), epidermal growth factor (EGF), Ki67, type I collagen, and elastin.

RESULTS

MFU induced dermal thickening, which was sustained up to 90 days. Immediately posttreatment (0 days), the parameters 4.5 mm, 10 Hz, 1 min, 6.63 W showed an average thickening of 0.16 mm, with a growth rate of 14.48 ± 3.64%, which was significantly higher than the 0% growth rate observed in the control group (p < 0.05). With the parameters of 3.0 mm, 25 Hz, 1 min, 1.32 W, the dermis thickened by an average of 0.69 mm at 90 days posttreatment, with a growth rate of 39.33 ± 14.34%. In contrast, the control group showed an increase of about 0.18 mm, with a growth rate of 0.92 ± 13.25% (p < 0.05). A prolonged treatment duration (2.5 min) and higher power levels (6.63 W) did not exhibit statistically different effects on the promotion of dermal thickness in this study. MFU also promoted collagen production in the SMAS layer in the long term. After treatment with parameters 3.0 mm, 25 Hz, 1 min, 1.32 W, the SMAS thickened by 0.12 mm at 30 days, while the control group showed an increase of 0.03 mm (p < 0.05). At 90 days, the SMAS thickened by approximately 0.17 mm, whereas the control group decreased by 0.04 mm (p < 0.05). Following treatment with parameters 3.0 mm, 10 Hz, 1 min, 6.63 W, the SMAS thickened by 0.11 mm at 30 days, with the control group showing an increase of 0.06 mm (p < 0.05). Immunofluorescence staining indicated a significant increase in type I and III collagen, MMP1, MMP3, TGF-β and Ki67 at 14 and 30 days after MFU treatment. The gene expression of MMP family members, TGF-β, EGF, type I collagen, and elastin fibers was markedly upregulated at 14, 30, and 90 days.

CONCLUSIONS

MFU treatment can stimulate the proliferation of collagen fibers in the dermis. It can also promote the proliferation of collagen in the SMAS layer. However, the effect of MFU treatment on fat is minimal due to limited energy and depth penetration.

Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

BACKGROUND

Collagen supplements are promoted to help aging skin. However, no meta-analysis of randomized controlled trials (RCTs) has examined their effects by funding source and study quality, which may influence outcomes.

METHODS

PubMed, Embase, and Cochrane Library were searched from inception to June 14, 2024.

RESULTS

A total of 23 RCTs with 1474 participants were analyzed. In a meta-analysis of all 23 RCTs, collagen supplements significantly improved skin hydration, elasticity, and wrinkles. However, in the subgroup meta-analysis by funding source, studies not receiving funding from pharmaceutical companies revealed no effect of collagen supplements for improving skin hydration, elasticity, and wrinkles, while those receiving funding from pharmaceutical companies did show significant effects. Similarly, high-quality studies revealed no significant effect in all categories, while low-quality studies revealed a significant improvement in elasticity.

CONCLUSIONS

There is currently no clinical evidence to support the use of collagen supplements to prevent or treat skin aging.

Habitual Dietary Collagen Intake Is Lower in Females and Older Irish Adults Compared with Younger Males

BACKGROUND

Collagen ingestion reportedly benefits connective tissues, such as skin, bone, muscle, tendon, and ligament. However, the quantity of collagen intake in the diet of European adults is unknown.

OBJECTIVES

This study aims to investigate collagen intake in the habitual diets of Irish adults, and whether it differed according to sex and/or age.

METHODS

We conducted secondary analysis of the Irish National Adult Nutrition Survey, which assessed typical dietary intake using a 4-d food diary in 1500 adults, aged 18-90 y. We categorized participants into 3 age groups: young (18-39 y, n = 630), middle-aged (40-64 y, n = 644), and older (≥65 y, n = 226) adults. Collagen composition of each individual food item in the database was determined by applying a percentage collagen value from analytical sources, allowing computation of collagen mean daily intake (MDI), collagen MDI relative to body mass, and collagen/total protein MDI. Differences in intakes between age groups and sexes were evaluated using physical activity level as a covariate.

RESULTS

Collagen MDI for the entire population was 3.2 ± 2.0 g/d, representing 3.6% ± 1.9% total protein intake. Males had higher absolute and relative collagen MDI than females, regardless of age (4.0 ± 2.1 g/d compared with 2.3 ± 1.4 g/d, P < 0.001), whereas older adults had lower absolute collagen MDI than middle-aged adults (2.9 ± 1.8 g/d compared with 3.3 ± 2.0 g/d, P = 0.021).

CONCLUSIONS

Collagen intake in the Irish adult population was considered low (relative to total protein intake and to dose-response studies), particularly in females and older individuals. Increasing daily collagen intake may therefore be warranted to optimize the health of collagen-rich tissues.

Evaluating the Efficacy of Acupotomy Subcision and Hyaluronic Acid Injections for Neck Wrinkles: A Randomized Trial

BACKGROUND

Horizontal neck wrinkles are a prevalent sign of aging, with emerging research highlighting the effectiveness of treatments such as acupotomy subcision (AS) and hyaluronic acid (HA) injections in rejuvenating aged skin.

AIMS

This study aims to evaluate and compare the efficacy of three distinct treatment modalities for neck wrinkles: AS, HA injections, and a combination of both. The primary objective is to determine which treatment approach offers the most effective and satisfactory outcomes in terms of wrinkle reduction and skin rejuvenation.

METHODS

In this randomized clinical trial, 30 female participants with neck Allergan Transverse Neck Lines Scale (ATNLS) scores ranging from 3 to 4 were randomly allocated into three treatment groups: AS, HA, and AS+HA. Each participant received treatment once a month for 3 months, followed by clinical assessments at 1 month and 6 months posttreatment. The assessments included ATNLS scores, Global Aesthetic Improvement Scores (GAIS), and analysis of skin elasticity and collagen levels.

RESULTS

All treatment groups demonstrated improvements in ATNLS scores and GAIS after the final treatment. Notably, the AS+HA group showed a significantly higher number of participants reporting beneficial results at the 6-month follow-up. This group also exhibited a statistically significant increase in skin elasticity and collagen levels compared to the other groups.

CONCLUSION

The combined approach of HA and acupotomy subcision is effective in treating horizontal neck wrinkles, leading to significant improvements in skin elasticity and collagen levels. This study suggests that the synergistic effect of AS and HA may enhance the overall efficacy of treatments for reducing neck wrinkles, providing a promising option for patients seeking noninvasive neck rejuvenation.

Epigallocatechin Gallate in Camellia sinensis Ameliorates Skin Aging by Reducing Mitochondrial ROS Production

Background: Reactive oxygen species (ROS) generated by mitochondrial dysfunction damage cellular organelles and contribute to skin aging. Therefore, strategies to reduce mitochondrial ROS production are considered important for alleviating skin aging, but no effective methods have been identified. Methods: In this study, we evaluated substances utilized as cosmetic ingredients and discovered Camellia sinensis (C. sinensis) as a substance that reduces mitochondrial ROS levels. Results:C. sinensis extracts were found to act as senolytics that selectively kill senescent fibroblasts containing dysfunctional mitochondria. In addition, C. sinensis extracts facilitated efficient electron transport in the mitochondrial electron transport chain (ETC) by increasing the efficiency of oxidative phosphorylation (OXPHOS), thereby reducing mitochondrial ROS production, a byproduct of the inefficient ETC. This novel mechanism of C. sinensis extracts led to the restoration of skin aging and the skin barrier. Furthermore, epigallocatechin gallate (EGCG) was identified as an active ingredient that plays a key role in C. sinensis extract-mediated skin aging recovery. Indeed, similar to C. sinensis extracts, EGCG reduced ROS and improved skin aging in an artificial skin model. Conclusions: Our data uncovered a novel mechanism by which C. sinensis extract reverses skin aging by reducing mitochondrial ROS production via selective senescent cell death/increased OXPHOS efficiency. Our results suggest that C. sinensis extract or EGCG may be used as a therapeutic agent to reverse skin aging in clinical and cosmetic applications.

Conjugation of Glycine max (L.) Merrill Oligopeptide with Monosaccharides: A Novel Approach for Stability and Efficacy in Cosmeceutical Applications

Background/Objectives: Conjugation techniques are increasingly valued in food chemistry for enhancing sensory properties, nutritional profiles, and bioactivity, with potential applications in cosmeceuticals. This study aimed to investigate the potential of Glycine max (L.) Merrill oligopeptide-monosaccharide conjugates as active ingredients in cosmeceuticals, emphasizing their biological activities and stability. Methods: G. max isolate was prepared and subsequently hydrolyzed using alcalase to obtain the oligopeptide (OP). The OP was then conjugated with allulose (AL) or mannose (MN) through a controlled humid-dry heating process to produce the conjugates, OPA and OPM, respectively. Their biological activities, including antioxidant, anti-tyrosinase, anti-collagenase, anti-elastase, and anti-hyaluronidase properties, were assessed and compared to the individual components. Additionally, the irritation potential was evaluated using the hen's egg test on chorioallantoic membrane (HET-CAM). The stability was examined under varying pH levels, temperatures, and light conditions based on their biological activity profiles. Results: OPA demonstrated the highest antioxidant activity, showing the lowest DPPH• IC50 value of 198.6 ± 2.7 µg/mL along with a strong ferric reducing power of 1.37 ± 0.04 µg FeSO4/g sample. Besides, OPM showed superior tyrosinase inhibition on both L-tyrosine and L-DOPA substrates, highlighting its potential for skin whitening. Both OPA and OPM significantly enhanced collagenase inhibition, supporting their anti-aging potential. All samples were non-irritating in the HET-CAM test. The conjugates (OPA and OPM) demonstrated enhanced stability against pH, heat, and light compared to OP, AL, and MN. Conclusions: Oligopeptide-monosaccharide conjugation not only improved bioactivity but also enhanced biological stability, suggesting their potential for use in cosmeceutical applications.

Mining bioactive components in agricultural crop and food production residue for sustainable solutions: In silico screening for skin anti-ageing properties

Possible sustainable resources of beneficial compounds for various applications are agricultural crop and food production residues (ACFPR), which are supported by considerable efforts to characterize their compositions and biological activities. This knowledge can be utilized for the rational selection of agricultural crop residue extracts and their components and possible use in the development of value-added products, such as anti-ageing cosmetics. The appearance of wrinkles, pigmentation, and a reduction in skin elasticity are typical signs of ageing skin that are often alleviated by natural product-based preparations. Here, we use in silico approaches to identify natural compounds from agricultural crop and food production residues with the potential to alleviate symptoms of or reverse the skin ageing process. Target predictions combined with extensive database and literature searches were utilized to identify compounds present in ACR and proteins linked to skin ageing. The binding affinity of natural products to selected proteins using molecular docking and the respective intermolecular interaction analyses are predicted to provide an indicative measure of the compounds' potential for skin anti-ageing activity. A number of natural compounds with the potential to interact with protein targets such as collagenase, elastase, and hyaluronidase were identified. In addition to in silico findings, cytotoxicity assays were conducted using rose hip seed extracts against Hs294T (human metastatic melanoma, ATCC HTB-140) and MRC-5 (normal fetal lung fibroblasts, ATCC CCL 171), demonstrating selective cytotoxicity. ELISA assays revealed that rose hip seed extracts induced a significant increase in SIRT1 levels (160% of control) and a reduction in TGF-β levels (80% of control). These experimental results support the potential of agricultural crop residue extracts in modulating key proteins involved in skin ageing, reinforcing their viability as ingredients in anti-ageing cosmetic formulations. An analysis of the molecular relationships and pathways that organic substances from sustainable sources can affect offers the potential for developing formulations for skin rejuvenation with possible synergistic effects by utilizing the rational design of innovative skincare products and laying the framework for more effective screening of anti-ageing compounds for different applications.

Benign skin tumors in older persons: a population-based study

BACKGROUND

Benign skin tumors become more common with advanced age. However, little is known about the etiology of these common lesions. Our objectives were to evaluate the risk factors for seborrheic keratosis, lentigo solaris, cherry angiomas and melanocytic nevi in an elderly population. Our candidate predisposing factors were sex, age, Fitzpatrick skin type, history of outdoor work, life style factors and anthropometric measurements and laboratory tests.

METHODS

In this retrospective cross-sectional study of a large, well-documented cohort, a total body skin examination (TBSE) was performed by dermatologists. The information gathered was augmented with self-reported data. The associations between benign skin tumors and the risk factors analysed with the Chi square test, Fischer exact test and analysis of variance as appropriate.

RESULTS

The study included 552 participants aged between 70 and 93 years. According to the TBSE, benign skin tumors were present in up to 78.7% in certain subsets of participants. Seborrheic keratosis was the most common lesion type, and 15.6% of all cases had > 50 lesions. Seborrheic keratosis were more common in males (p < 0.05), while lentigo solaris and cherry angiomas were more common in females (p < 0.05). A history of outdoor working associated with higher number of lentigo solaris and seborrheic keratosis lesions (p < 0.05). There was an association between lower glycated haemoglobin levels and the presence of multiple cherry angiomas (p < 0.05). Female subjects with multiple cherry angiomas had higher levels of high-density cholesterol and lower triglyceride values than in those with fewer cherry angiomas (p < 0.05 for both). In males, lower mean haemoglobin levels were associated with multiple cherry angiomas (p < 0.05).

CONCLUSIONS

We found sex differences and several new possible etiological factors behind benign skin tumors which, despite being common, remain poorly characterized.

Exploring melatonin's signalling pathways in the protection against age-related skin deterioration

Melatonin, renowned for regulating sleep-wake cycles, also exhibits notable anti-aging properties for the skin. Synthesized in the pineal gland and various tissues including the skin, melatonin's efficacy arises from its capacity to combat oxidative stress and shield the skin from ultraviolet (UV)-induced damage. Moreover, it curbs melanin production, thereby potentially ameliorating hyperpigmentation. The presence of melatonin receptors in diverse skin cell types and its documented ability to enhance skin tone, hydration, and texture upon topical administration underscores its promise as an anti-aging agent. Melatonin's protective effects likely emanate from its multifaceted characteristics, encompassing antioxidant, anti-inflammatory, and immunomodulatory functions, as well as its influence on collagen synthesis and mitochondrial activity. Chronic inflammation and oxidative stress initiate a detrimental feedback loop. Reactive oxygen species (ROS), notorious for damaging cellular structures, provoke immune responses by oxidizing vital molecules and activating signaling proteins. This triggers heightened expression of inflammatory genes, perpetuating the cycle. Such dysregulation significantly compromises the body's resilience against infections and other health adversities. This study embarks on an exploration of the fundamental signaling pathways implicated in skin aging. Furthermore, it delves into the therapeutic potential of melatonin and its anti-aging attributes within the realm of skin health.

Is skin thinning a natural consequence of aging or a result of sarcopenia?

It is widely known that skin thickness decreases and fragility increases with aging. However, the relationship between sarcopenia, a condition commonly associated with frailty in older adults, and skin thickness remains unclear. This study aimed to evaluate the presence of skin thinning in patients with sarcopenia and investigate the relationship between sarcopenia, age, and skin thickness. This cross-sectional study included 66 participants aged 40 to 80, comprising 20 individuals with pre-sarcopenia, 13 with sarcopenia, and 33 healthy controls. Total skin thickness (epidermal + dermal) was measured using ultrasound (US) at four anatomical regions: leg, hand, forearm, and upper arm. Leg and hand skin thicknesses were significantly lower in patients with pre-sarcopenia compared to the control group (all p < 0.05). Similarly, forearm and upper arm skin thicknesses were significantly lower in patients with sarcopenia compared to the control group (all p = 0.001). After adjusting for confounding factors such as age, sex, and BMI, Sarcopenia remained significantly associated with reduced skin thickness across all regions (all p < 0.05). A moderate-to-high positive correlation exists between HGS and leg skin thickness (all p < 0.01). However, no significant relationships were found between skin thickness and age or sex. Sarcopenia is associated with skin thinning across all examined regions, independent of age, sex, or BMI. Skin thickness measurements may serve as a diagnostic marker for sarcopenia.

Mushrooms in modern cosmetics: unlocking anti-aging, antioxidant, and therapeutic potential

Mushrooms have gained significant attention in the cosmetics industry due to their rich bioactive compounds with numerous skin benefits. This review explores the potential of various mushroom species as ingredients in cosmeceuticals, focusing on their anti-aging, anti-wrinkle, skin whitening, moisturizing, antioxidant, anti-inflammatory, and antimicrobial properties. Mushrooms such as Ganoderma lucidum, Lentinula edodes, Pleurotus ostreatus, and Agaricus bisporus have demonstrated the ability to inhibit key enzymes like elastase, tyrosinase, hyaluronidase, and collagenase, which play vital roles in skin aging and pigmentation. These bioactive compounds, including polysaccharides, phenolic acids, vitamins, and carotenoids, contribute to reduce wrinkles, improving skin hydration, enhancing elasticity, and providing protection from oxidative stress and UV damage. Furthermore, mushrooms have shown antimicrobial activities, making them effective against skin infections and inflammation. Mushrooms have become a popular ingredient in hair care products for their nourishing benefits, helping to promote healthy hair growth and protect against damage. As demand for natural, sustainable, and effective skincare alternatives rises, the incorporation of mushrooms into cosmetic formulations offers a promising solution. This review highlights the growing application of mushrooms in the development of innovative cosmeceuticals and emphasizes the need for further research to explore their full potential. Advancements in extraction techniques and the identification of new bioactive compounds are expected to enhance the efficacy of mushroom-based skincare products, making them an integral part of the global cosmetics market in the future.

Elicitor-driven enhancement of phenolic compounds in geranium callus cultures: phytochemical profiling via LC-MS/MS and biological activities

This research explores the effects of chitosan (CHT) and salicylic acid (SA) as elicitors on the production of phenolic and flavonoid compounds in Pelargonium graveolens Hort. Callus cultures on solid media, aiming to enhance antioxidant, anti-tyrosinase, and anti-elastase properties. Calli were treated with various concentrations of CHT (25, 50, 75, and 100 mg/mL) and SA (25, 50, 75, and 100 µM), and their phytochemical profiles were examined through LC-MS/MS analysis. The findings indicated that salicylic acid (SA) and chitosan (CHT) notably enhanced the levels of total phenolic content (TPC) and total flavonoid content (TFC). The greatest increase in TPC was seen in cultures treated with 25 µM of salicylic acid (SA2), recording 336.80 ± 8.35 mg/100 g dry weight (DW), and in cultures treated with 100 mg/mL of chitosan (CHT5), which showed 325.74 ± 7.81 mg/100 g DW. Among individual phenolics, kaempferol showed a remarkable increase under SA2 (192.82 ± 17.99 mg/100 g DW) compared to the control (103.68 ± 5.00 mg/100 g DW), and CHT5 treatment (119.68 ± 12.01 mg/100 g DW). Additionally, rutin accumulation peaked at 30.64 ± 3.00 mg/100 g DW under SA2 treatment. Antioxidant activities, measured by DPPH and TAC assays, were also enhanced, with SA2 and CHT5 treatments showing significant improvement over the control. The SA2-elicited cultures exhibited superior anti-tyrosinase and anti-elastase activities, with IC50 values of 51.43 ± 1.31 μg/mL, 35.42 ± 4.42 μg/mL, and 31.84 ± 0.60 μg/mL, respectively. These findings suggest that elicitors effectively boost the bioactive compound production in P. graveolens calli, and subsequently the biological activity, highlighting their potential in developing natural skincare products with antioxidant and anti-aging benefits.

A Comprehensive Review of the Role of UV Radiation in Photoaging Processes Between Different Types of Skin

Ultraviolet (UV) radiation significantly contributes to photoaging, with its effects varying among different Fitzpatrick skin types. Light skin (Types I-III) has a natural sun protection factor (SPF) of only 3.3, making it particularly vulnerable to DNA damage, collagen degradation, and skin cancer. Darker skin (Types IV-VI) has a natural SPF of 13.4, providing greater photoprotection while elevating the risk of post-inflammatory hyperpigmentation and delaying skin cancer diagnosis. UVA penetrates deep into the dermis, promoting collagen degradation, whereas UVB causes DNA mutations, increasing the risk of cancer. Eumelanin in darker skin mitigates oxidative stress, while pheomelanin in lighter skin functions as a pro-oxidant, increasing vulnerability to photoaging. Although incidence rates are lower, melanoma is identified at more advanced stages in those with darker skin, resulting in poorer outcomes. Protective measures, such as broad-spectrum sunscreens, antioxidants, and hydration, are crucial for all skin types but necessitate customized strategies. Individuals with lighter skin benefit from SPF 50+ and DNA-repairing compounds, whereas those with darker complexion necessitate SPF 30-50 and pigmentation-focused skincare. Comprehending the biological mechanisms and variations in UV damage facilitates the creation of customized photoprotection solutions, enhancing skin health and mitigating long-term UV-related issues for all skin types.

A dual-drive strategy for enhanced protein crystallization with sodium alginate/hyaluronic acid film: Protein adsorption and supersaturation regulation

Protein crystallization is essential for determining the three-dimensional structures of biomacromolecules and advancing biopharmaceutical development, yet it remains a major challenge in structural biology due to common issues like slow nucleation rates and inconsistent crystal quality. Herein, a dual-drive crystallization (DDC) strategy, relying on a composite film of sodium alginate (SA) and hyaluronic acid (HA), is reported to synergistically regulate both protein adsorption and solution supersaturation. Driven by the electrostatic interactions of SA and the water absorption properties of HA, the SA/HA film achieves enhanced crystallization efficiency and controlled crystal quality mainly. It significantly reduces lysozyme nucleation time by over 66.0 % and better controls crystal size distribution. Molecular simulations further reveal a strong electrostatic interaction energy of -17.0 kcal·mol-1 between protein and SA, which enhances protein adsorption and then promotes cluster formation, nucleation, and crystal growth. Additionally, the DDC strategy efficiently promotes the crystallization of both thaumatin and proteinase K, enhancing the crystallization success rate for proteins with opposite charges. These results highlight the advantages and promising potential of SA/HA film-assisted protein crystallization for effectively producing protein crystals suitable for diverse applications.

Green solid lipid nanoparticles by coacervation of fatty acids: An innovative cosmetic ingredient for the delivery of anti-age compounds through the skin

The constant exposure of the skin to internal and external stimuli drives towards skin aging and lost in skin hydration and elasticity. Chronic low-grade inflammation, called inflammaging, and oxidative stress are the leading causes of this phenomenon. Fatty acid coacervation is a preparation method for Solid Lipid Nanoparticles (SLNs), which does not employ solvents, and is associated to low energy consumption. Of note, Green SLNs by coacervation may be obtained from natural soaps. Within this concern, in this experimental work, Mango and Shea SLNs, prepared by coacervation from the corresponding vegetal soaps, were loaded with an UV-filter, 2-ethylhexyl 4-(dimethylamino)benzoate, and two anti-age ingredients, α-Tocopherol and Tocopheryl nicotinate, and characterized by a physico-chemical standpoint. Such Green cosmetic SLNs were monitored for stability after storage at 4, 25, 40 °C for 28 days. Moreover, an anti-age serum and hydrogel were prepared, based upon Green cosmetic SLNs. Stability studies were performed on sera and hydrogels, including physico-chemical stability studies (rheology, pH, centrifugation) and evaluation of organoleptic characteristics (appearance, odour, colour) after storage at 4, 25, 40 °C up to 1 year, with the best results obtained for Mango SLNs-based serum. Therefore, Franz cells studies with pig-ear skin were carried out on Mango SLNs and Mango SLNs-based serum, showing that loading in SLNs enhances the permeation of compounds. A challenge test and a patch test assessed the safety of such serum for human usage, and an efficacy study on human volunteers demonstrated its capability to increase skin hydration and elasticity.

Short- and Long-Term Effects of Adding Topical Cosmetics to a Dermatological Procedure (Thermage): A Randomized Controlled Comparative Study Exploring the Synergistic Effects

BACKGROUND

Dermatological procedures improve skin changes caused by aging. However, few studies have focused on the effect of improving various skin characteristics compared with the concurrent use of cosmetics. We aimed to confirm changes in skin characteristics owing to anti-aging dermatological procedures in the short- and long-term and to determine the efficacy of the procedure when products with anti-aging and repair effects are used together.

MATERIALS AND METHODS

We included 42 women (mean age, 47.667 ± 3.183 years) divided into a test (n = 21) and control (n = 21) group, with no history of dermatological procedures within 3 months of the test participation date. The dermatological procedure involved a single application of Thermage treatments, and products containing repair and anti-aging ingredients were used for the test group. The skin changes were assessed using device-based measurements and image analysis up to 4 weeks post-procedure.

RESULTS

Post-procedure side effects were alleviated 1 day after the procedure, and transepidermal water loss (TEWL) improved when the products were used together. Skin hydration, elasticity, density, fine lines, texture, and pores improved at 4 weeks after the procedure. When the test product was also used, the improvement was significantly greater, and TEWL of the face improved in the test group only. Aging-related skin characteristics were improved by Thermage, and the combined use of test products and procedures with repair and anti-aging effects improved skin characteristics.

CONCLUSION

Dermatological procedures and cosmetic products have internal and external anti-aging effects on the skin, respectively, resulting in synergy.

Influences on Skin and Intrinsic Aging: Biological, Environmental, and Therapeutic Insights

BACKGROUND/AIM

Aging involves a progressive deterioration in physiological functions and increased disease susceptibility, impacting all organs and tissues, especially the skin. Skin aging is driven by intrinsic factors (genetics, cellular metabolism) and extrinsic factors (environment, lifestyle). Understanding these mechanisms is vital for promoting healthy aging and mitigating skin aging effects. This review aims to summarize the key factors influencing skin and intrinsic aging, providing a comprehensive understanding of the underlying mechanisms and contributing elements.

METHODS

A comprehensive literature review was conducted, focusing on peer-reviewed journals, clinical studies, and scientific reviews published within the last two decades. The inclusion criteria prioritized studies that addressed intrinsic and extrinsic mechanisms of skin aging. To ensure the relevance and quality of the selected sources, a systematic approach was used to assess study design, sample size, methodology, and the significance of the findings in the context of skin aging.

FINDINGS

The review identifies major internal factors, such as cellular senescence, genetic predisposition, telomere shortening, oxidative stress, hormonal changes, metabolic processes, and immune system decline, as pivotal contributors to intrinsic aging. External factors, including UV radiation, pollution, lifestyle choices (diet, smoking, alcohol consumption, and sleep patterns), and skincare practices, significantly influence extrinsic skin aging. The interplay between these factors accelerates aging processes, leading to various clinical manifestations like wrinkles, loss of skin elasticity, pigmentation changes, and texture alterations.

CONCLUSION

A comprehensive understanding of both extrinsic and intrinsic factors contributing to skin aging is essential for developing effective prevention and intervention strategies. The insights gained from this review highlight the importance of a multifaceted approach, incorporating lifestyle modifications, advanced skincare routines, and emerging therapeutic technologies, to mitigate the effects of aging and promote healthier, more resilient skin.

An injectable hyaluronic acid/lithium calcium silicate soft tissue filler with vascularization and collagen regeneration

The significance of collagen and vascular in skin augmentation have been recognized in recent years. However, current skin tissue fillers, e.g. hyaluronic acid (HA) or HA-based hydrogel, fail to meet the perfect augmentation requirements due to their inadequate long-term support effect and the lack of tissue-inducing activity. Herein, an injectable skin filler containing hyaluronic acid (HA) hydrogel and lithium calcium silicate (LCS, Li2Ca4Si4O13) bioceramic microspheres was developed for skin tissue fillers, owing to the excellent biological function of silicate bioceramics. The HA-LCS fillers could be easily injected through a tiny standard medical needle (27 G) with force of less than 36 N, and showed good biocompatibility both in vitro and in vivo. Furthermore, the bioactive ions released from HA-LCS fillers significantly enhanced the expression of vascularization-related genes and collagen-related genes. Importantly, the HA-LCS fillers not only stimulated the regeneration of mature blood vessels, but also promoted collagen secretion in dermal skin and filling area. This study not only presented an injectable filler with enhanced regeneration of blood vessels and collagen, but also provided a new strategy for developing tissue-induced fillers based on bioactive components of silicate bioceramics.

Bioactive oligopeptides and the application in skin regeneration and rejuvenation

Oligopeptides, composed of 2-10 amino acid residues, are protein fragments with unique structural characteristics, including small molecular size, high biocompatibility, and modifiable functional groups. These features endow oligopeptides with excellent permeability, safety, and versatile biological activities, making them widely applicable in disease treatment, drug delivery, and skincare. In particular, oligopeptides have emerged as advanced ingredients in skincare, offering anti-aging, anti-wrinkle, and whitening effects by regulating key biological processes such as collagen synthesis, antioxidant defense, and melanin production. This review comprehensively discusses the structural properties, functional mechanisms, and diverse applications of oligopeptides and their derivatives, highlighting their potential in skin regeneration, rejuvenation, and anti-aging medicine. By providing insights into the latest advancements, this review aims to serve as a valuable reference for future research and development in oligopeptide-based therapeutics and skincare innovations.

Prebiotic and panthenol-containing dermocosmetic improves tolerance from artificial daylight photodynamic therapy: A randomized controlled trial in patients with actinic keratosis

INTRODUCTION & OBJECTIVES

Treatment with daylight photodynamic therapy (dPDT) of actinic keratosis (AK) is associated with local skin reactions (LSR), which may affect patients' quality of life and treatment acceptability. This study explores the potential of a prebiotic and panthenol-containing Dermocosmetic Cream (DC) to enhance tolerance and mitigate post-dPDT induced LSR in the treatment of AKs.

MATERIALS & METHODS

This randomized controlled, intra-individual trial included 20 patients with ≥10 AKs in two symmetrical areas on their face or décolleté, treated with a single session of artificial dPDT. After treatment, the two areas were randomized to DC twice daily for 14 days or No-DC. Primary outcomes included clinical signs of LSR graded from 0=none to 3=severe, calculated as a composite score, and assessed on Days 2, 7, 14, and 30 post-treatment, along with AK clearance rate. Secondary outcomes encompassed objectively measured erythema, and clinical and objective skin photoaging assessment.

RESULTS

Topical application of DC following dPDT significantly improved post-treatment tolerance up to two weeks. By Day 2, DC-treated skin had milder LSR (median 3.0, IQR 2.0-4.8) compared to No-DC skin (median 4.0, IQR 3.0-5.0; p=0.011). This improvement continued on Day 7 (DC median 3.0, IQR 2.0-3.8 vs. No-DC median 4.5, IQR 3.0-5.8; p<0.001) and Day 14 (DC median 1.0, IQR 0.0-1.0 vs. No-DC median 1.0, IQR 1.0-2.0; p=0.004). Objective measurements showed milder erythema in DC-treated areas on Day 2 (p=0.045) and Day 7 (p=0.005). Crusting resolved more effectively in DC-treated areas by Day 7 (40% vs. 20%; p=0.039). No significant difference in complete lesion response rate was observed between DC and No-DC skin (p=0.850). By Day 30, clinical photoaging assessment demonstrated significant improvement in dyspigmentation (p=0.004) and skin texture (p<0.001) in both locations. Moreover, objective measurements revealed reduced dyspigmentation in both DC and No-DC treated skin (p≤0.001).

CONCLUSION

Application of a prebiotic and panthenol-containing multipurpose DC significantly enhanced tolerance from artificial dPDT and accelerated healing time up to 14 days after treatment. The use of DC cream did not affect the overall treatment efficacy of dPDT, indicating its potential to enhance patient comfort following dPDT.

Krill oil supplementation improves transepidermal water loss, hydration and elasticity of the skin in healthy adults: Results from two randomized, double-blind, placebo-controlled, dose-finding pilot studies

BACKGROUND

Dietary marine omega-3 fatty acids and phospholipids have individually shown favorable effects on skin barrier function. Krill oil offers a combination of omega-3 in phospholipid form which might enhance the efficacy in supporting skin health.

AIMS

The aim was to investigate the impact of two different doses of krill oil on skin transepidermal water loss (TEWL) in healthy adults. Secondary outcomes were skin hydration, elasticity and the omega-3 index.

METHODS

Two randomized, double-blind, placebo-controlled, pilot studies were conducted in healthy adults with a baseline TEWL of >10 and ≤24.9 g/m2/h. In study 1, 51 participants consumed 1 g of krill oil or placebo daily. In study 2, 50 participants consumed 2 g of krill oil or placebo daily. The outcomes were assessed at baseline, 6 and 12 weeks.

RESULTS

The krill oil supplemented groups significantly increased their omega-3 index versus placebo in both studies. Furthermore, the krill oil groups in both studies showed statistically significant beneficial reductions in TEWL (from 14.47 ± 3.65 to 13.83 ± 3.78 in study 1 and from 14.25 ± 3.21 to 13.02 ± 2.76 in study 2) and increases in hydration and elasticity when compared to placebo. There were significant linear relationships between changes in the omega-3 index and changes in TEWL, hydration and elasticity in both studies.

CONCLUSIONS

Daily oral supplementation with 1 and 2 g of krill oil showed significant and dose-dependent improvements in skin TEWL, hydration, and elasticity compared to placebo that correlated with changes in the omega-3 index.

Hyaluronan and proteoglycan link protein 1 - A novel signaling molecule for rejuvenating aged skin

The skin seems to rejuvenate upon exposure to factors within the circulation of young organisms. Intrinsic factors that modulate skin aging are poorly understood. We used heterochronic parabiosis and aptamer-based proteomics to identify serum-derived rejuvenating factors. We discovered a novel extracellular function of hyaluronan and proteoglycan link protein 1 (HAPLN1). Its serum levels decreased with age, disturbing the integrity of the skin extracellular matrix, which is predominantly composed of collagen I and hyaluronan; levels of various markers, which decrease in aged skin, were significantly restored in vivo and in vitro by the administration of recombinant human HAPLN1 (rhHAPLN1). rhHAPLN1 protected transforming growth factor beta receptor 2 on the cell surface from endocytic degradation via mechanisms such as regulation of viscoelasticity, CD44 clustering. Moreover, rhHAPLN1 regulated the levels of nuclear factor erythroid 2-related factor 2, phosphorylated nuclear factor kappa B, and some cyclin-dependent kinase inhibitors such as p16 and p21. Therefore, rhHAPLN1 may act as a novel biomechanical signaling protein to rejuvenate aged skin.

Functional Properties and Components of Koenigia alpina Extract

BACKGROUND

Koenigia alpina (All.) T.M.Schust. & Reveal (alpine knotweed) is a perennial herb belonging to the Polygonaceae family. Several studies have examined Polygonaceae species' potential applications as cosmeceutical materials; however, the potential of K. alpina as a cosmeceutical has not yet been studied.

MATERIALS AND METHODS

Hydrogen peroxide (H2O2) and lipopolysaccharide were used to induce an inflammatory response in RAW 264.7 cells. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radicals and H2O2 were used to evaluate the free-radical scavenging activity of K. alpina extract and its protective effect against reactive oxygen species (ROS)-induced cell damage. The whitening, antiaging, and cell proliferation/migration effects of the extracts were evaluated via tyrosinase inhibition, collagenase/elastase inhibition, and wound healing assays, respectively. The anti-inflammatory effect was confirmed by evaluating nitric oxide (NO) production in RAW 264.7 cells. High-performance liquid chromatography (HPLC), UV, and MS/MS were used to determine the main components of the extract and fractions.

RESULTS

The ethyl acetate (EA) fraction and its aglycone fraction showed very high free-radical scavenging activities (47.5 and 47.1 µg/mL, respectively). The extract/fractions also showed significant tyrosinase inhibition (IC50 = 0.38 mg/mL in EA fraction), collagenase inhibition (IC50 = 0.21 mg/mL in EA fraction), and elastase inhibition (IC50 = 0.57 mg/mL in aglycone fraction). NO production in lipopolysaccharide-induced RAW 264.7 cells was inhibited by the extract/fractions. The extract also promoted the closure of scratch wounds in HaCaT cells. The K. alpina extract/fractions contained cardamonin, quercetin, and quercitrin.

CONCLUSION

K. alpina extracts/fractions showed antioxidant, antiaging, whitening, and anti-inflammatory activities, suggesting they may have potential as antiaging cosmeceuticals.

Injectable and biodegradable collagen-chitosan microspheres for enhanced skin regeneration

Skin aging is influenced by both external environmental factors and intrinsic biological mechanisms. Traditional microsphere implants aim to rejuvenate aging skin through collagen regeneration, yet their non-biodegradability and risk of granuloma formation often limit their effectiveness. In this study, we developed novel, injectable, highly bioactive, and degradable collagen-chitosan double-crosslinked composite microspheres for skin rejuvenation. The microspheres demonstrated excellent injectability, requiring an injection force of only 0.9 N, and significant biodegradability, effectively degraded in solutions containing phosphate buffer, type I collagenase, and pepsin. In addition, the microspheres exhibited excellent biocompatibility and bioactivity, significantly promoting the proliferation, adhesion, and migration of human foreskin fibroblast-1 (HFF-1) cells. In a photoaged mouse skin model, the implantation of microspheres significantly enhanced dermal density and skin elasticity while reducing transepidermal water loss. Importantly, the implant promoted the regeneration of collagen fibers. This study suggests that collagen-chitosan double-crosslinked composite microspheres hold significant potential for skin rejuvenation treatments.

Recent advances of electrospun strategies in topical products encompassing skincare and dermatological treatments

As the potential applications of electrospinning in healthcare continue to be explored, along with advancements in industrial-scale solutions and the emergence of portable electrospinning devices, some researchers have explored electrospinning technology in topical products, including its application in skincare, such as facial masks, beauty patches, sunscreen, and dermatological treatments for conditions like atopic dermatitis, psoriasis, acne, skin cancer, etc. In this review, we first outline the fundamental principles of electrospinning and provide an overview of existing solutions for large-scale production and the components and functionalities of portable spinning devices. Based on the essential functionalities required for skincare products and the mechanisms and treatment methods for the aforementioned dermatological diseases, we summarize the potential advantages of electrospinning technology in these areas, including encapsulation, sustained release, large surface area, and biocompatibility, among others. Furthermore, considering the further commercialization and clinical development of electrospinning technology, we offer our insights on current challenges and future perspectives in these areas, including issues such as ingredients, functionality, residue concerns, environmental impact, and efficiency issues.

Histological Changes of Porcine Animal Skin with Micro-focused Ultrasound

BACKGROUND

As a noninvasive alternative therapy, microfocused ultrasound (MFU) has become a research hotspot in recent years for its potential to enhance skin laxity. While several clinical studies have explored the effects of MFU on improving skin laxity, there is limited literature available on the histological changes resulting from MFU treatments. It has been established that the skin structure and composition of the Bama miniature pigs closely resembles that of humans, including collagen content, type I collagen distribution, and elastin distribution.

METHODS

This study primarily focuses on examining the histological alterations in the skin tissue of Bama miniature pigs following MFU application. We also selected some typical clinical photographs of patients treated with MFU and compared the clinical effects with histological changes observed in porcine skin. The MFU device utilized in this study incorporates ultra-pulse technology and large focal area technology.

RESULTS

Following the standard operating procedures provided by the manufacturer, different handles were used in different skin area of pigs. Biopsies were obtained immediately after treatment and 1 month after treatment. Significant histological changes were observed in the Bama miniature pigs skin, including collagen contraction and fragmentation, dilation and congestion of superficial dermal capillaries immediately after MFU treatment; dermal thickening, increased thickness and density of collagen fibers, elevated levels of elastin and type I collagen, as well as thickened fiber septa in the adipose layer 1 month later. These histological results corresponded to clinical findings in human, such as facial redness and swelling immediately after treatment, and improvement in facial relaxation after approximately 1 month after treatment.

CONCLUSION

Collectively, these histological findings provide valuable evidence supporting the clinical application of MFU for enhancing skin laxity.

NO LEVEL ASSIGNED

This journal requires that authors assign a level of evidence to each submission to which Evidence-Based Medicine rankings are applicable. This excludes Review Articles, Book Reviews, and manuscripts that concern Basic Science, Animal Studies, Cadaver Studies, and Experimental Studies. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Mechanisms of Senescence and Anti-Senescence Strategies in the Skin

The skin is the layer of tissue that covers the largest part of the body in vertebrates, and its main function is to act as a protective barrier against external environmental factors, such as microorganisms, ultraviolet light and mechanical damage. Due to its important function, investigating the factors that lead to skin aging and age-related diseases, as well as understanding the biology of this process, is of high importance. Indeed, it has been reported that several external and internal stressors contribute to skin aging, similar to the aging of other tissues. Moreover, during aging, senescent cells accumulate in the skin and express senescence-associated factors, which act in a paracrine manner on neighboring healthy cells and tissues. In this review, we will present the factors that lead to skin aging and cellular senescence, as well as ways to study senescence in vitro and in vivo. We will further discuss the adverse effects of the accumulation of chronic senescent cells and therapeutic agents and tools to selectively target and eliminate them.

The Characteristics and Inheriting Pattern of Skin Aging in Chinese Women: An Intergenerational Study of Mothers and Daughters

Introduction

The aging of the skin, which is affected by both external and internal causes, can reflect the external age and the internal health status. While the aging characteristics differ across ethnic groups, the specific changes in skin aging within the Chinese population have been underexplored. Moreover, investigating the similarity of aging skin characteristics between parent-offspring pairs remains uncharted territory. This study aims to fill these gaps by examining the skin aging features of Chinese women and assessing the similarity in aging skin characteristics between mother-daughter pairs.

Methods

A total of 40 mother-daughter pairs were recruited and analyzed. The perceived ages of the participants were evaluated, and their aging skin traits were systematically graded. Statistical methods were employed to discern the trends of the aging skin characteristics. By introducing a novel similarity parameter, we compared whether various skin aging characteristics have similar patterns between mothers and daughters.

Results

Our findings indicate that age 50 represents a pivotal point in skin aging. Beyond this age, the increase in rhytides and laxity scores accelerated noticeably, whereas the escalation in dyschromia scores became less marked. By introducing similar parameters between mother-daughter pairs and the radar map, we discovered that the skin aging characteristics are remarkably consistent between mother-daughter pairs.

Conclusion

Understanding the main aging skin characteristics of different age groups can allow caregivers to devise treatments for preventing skin aging in women of various ages. The mother's skin aging trend is also significant for the daughter's skin aging prevention.

In vitro efficacy of Rosa damascena solid state fermentation liquid and water extract on skin care

BACKGROUND

As a medicinal and food homologous plant, Rosa damascena is not only highly ornamental, but also rich in a variety of active ingredients such as polyphenols and flavonoids. It is widely used in cosmetics, food and pharmaceutical industries.

OBJECTIVE

To study the in vitro efficacy of Rosa damascena solid state fermentation liquid (RDF) and water extract (RDE).

METHODS

Firstly, the effect of RDF and RDE on the proliferation rate of B16F10 cells was detected by CCK-8 method, and the melanin content was measured by sodium hydroxide lysis method to evaluate the whitening effect of them. Finally, the antioxidant, anti-wrinkling and soothing effects of RDF and RDE were evaluated by biochemical methods in vitro.

RESULTS

RDF and RDE within a certain concentration range (0.05%-0.5%) had no effect on the proliferation of B16F10 cells. Compared with Rosa damascena extract (RDE), RDF showed significant effects on bleaching, antioxidant, anti-wrinkling and soothing, among which 0.5% RDF showed the best effect.

CONCLUSION

Both RDF and RDE at a certain concentration have effect on skin care in vitro, but the effect of RDF is more significant than that of RDE.

Prevention of UVB-Induced Photoaging by an Ethyl Acetate Fraction from Allomyrina dichotoma Larvae and Its Potential Mechanisms in Human Dermal Fibroblasts

Allomyrina dichotoma larvae (ADL) is an insect type that is used ethnopharmacologically to treat various diseases; however, its use as an antiaging treatment has not been widely studied. Previously, we found that an ethyl acetate (EA) fraction derived from an ADL extract (ADLE) has a high polyphenol content and antioxidant properties. In this study, we identified the underlying molecular mechanism for the protective effect of the EA fraction against UVB-induced photodamage in vitro and ex vivo. UVB treatment increased intracellular reactive oxygen species levels and DNA damage; the latter of which was significantly decreased following cotreatment with the EA fraction. Biological markers of aging, such as p16INK4a, p21WAF1, and senescence-associated β-gal levels, were induced by UVB treatment but significantly suppressed following EA-fraction treatment. UVB-induced upregulation of matrix metalloproteinase (MMP)-1 and downregulation of COL1A1 were also reversed by EA-fraction treatment in both cells and a 3D skin model, which resulted in increased keratin and collagen deposition. Moreover, EA-fraction treatment inhibited the phosphorylation of MAPKs (p38, ERK, and JNK) and nuclear factor (NF-)-kB and decreased the levels of inflammatory cytokines in UVB-treated cells. The results indicate that an EA fraction from ADLE ameliorates UVB-induced degradation of COL1A1 by inhibiting MMP expression and inactivating the MAPK/NF-κB p65/AP-1 signaling pathway involved in this process.

Instant and Multifunctional Nanofibers Loaded with Proanthocyanidins and Hyaluronic Acid for Skincare Applications

Hyaluronic-acid- and silk-fibroin-based nanofibrous mats loaded with proanthocyanidins and collagen peptides were fabricated as multifunctional facial masks using electrospinning. Their morphology, hygroscopicity and moisture retention, DPPH, ABTS free radical scavenging abilities, and cytocompatibility were investigated. The results showed that the nanofibrous mats were dense and uniform, with an average diameter ranging from 300 to 370 nm. The nanofibrous mats exhibited satisfactory moisture retention, oxidation resistance, biocompatibility, especially excellent DPPH, and ABTS free radical scavenging capacities. DPPH free radical scavenging activity was 90% with 15 mg/L nanofibers, and ABTS free radical scavenging activity was 90% with 0.005 mg/L nanofibers. The nanofibrous mats protected fibroblasts from oxidative stress damage induced by tert-butyl hydroperoxide (t-BHP) and significantly promoted their proliferation. Compared with traditional liquid masks and semi-solid facial masks, the multifunctional nanofibrous mats prepared in this study contained fewer additives, which has significant advantages in terms of safety. The nanofibrous mats were rapidly dissolved within 5 s after being sprayed with water, which facilitated the release and penetration of active ingredients for skincare. Therefore, the multifunctional nanofibrous mats displayed excellent moisture retention, oxidation resistance, and biocompatibility, indicating promising translational potential as facial masks and providing a valuable reference for skincare.

Combination of Nicotinamide and Agastache rugosa Extract: A Potent Strategy for Protecting Hs68 Cells from UVB-Induced Photoaging

This study investigated the protective effects of nicotinamide (NAM) and Agastache rugosa extract (AR) against ultraviolet B (UVB)-induced photoaging in Hs68 cells. The results demonstrated that NAM and AR, alone or in combination, exhibited concentration-dependent protective effects against UVB radiation. The highest synergistic effect was observed at a NAM:AR ratio of 6:4. This combination exhibited a synergistic protective effect against UVB-induced photoaging. The sample concentration required for 80% cell survival was 9.70 μM and 131.16 ppm for NAM and AR, respectively. However, when combined, they exhibited strong synergistic effects with concentrations as low as 0.11 μM and 17.50 ppm. Moreover, 5.26 μM of NAM and 1,082.13 ppm of AR were required to inhibit 30% of reactive oxygen species, but the combination treatment required 0.62 μM and 95.49 ppm, respectively. This combination significantly reduced the production of matrix metalloproteinase and increased collagen production. These findings highlight the potential of combining NAM and AR as functional cosmetic materials to protect against UVB-induced photoaging. The synergistic effects observed in this study provide valuable information for developing novel strategies for cosmetic combinations that target UVB-mediated skin damage.

Association between the three-dimensional facial shape and its color in a boundary group of young to middle-aged Asian women

Visual cues strongly influence an individual's self-esteem and have fundamental sociopsychological functions. The color and shape of the face are important information for visual cues and are hypothesized to be correlated with each other. However, few studies have examined these relationships. Thus, this study determined the association between color and shape of the face. For this purpose, we evaluated Chinese women in their 30s and 40s (n = 166). Three-dimensional (3D) image-capture devices that provide shape morphology along with standardized photographs (color information) were used to obtain 3D images of women. The coordinates and red‒green-blue color data on the 3D images were utilized to perform principal component (PC) analysis, and shape and color PCs were generated. A canonical variate analysis was then conducted to check for significant correlations between the shape and color PCs. As a result, 6 significant correlations were found (p < 0.05). In detail, in addition to the physical correlations (i.e., steric faces or faces with protrusion of the cheek showed greater shadows, retrognathism was related to a shadow under the lower lip and vice versa), biological correlations (fatty faces showed greater redness and remarkable marionette lines; faces with age-related sagging showed greater darkness, possibly related to cumulative ultraviolet radiation exposure of the skin; and robust mandibles and supraorbital ridges were related to thick eyebrows) were found. This insight can aid both medical and cosmetic practitioners in comprehending the intricate details conveyed by facial features, thereby facilitating more comprehensive diagnosis and treatment planning, including makeup.

Collagen peptides affect collagen synthesis and the expression of collagen, elastin, and versican genes in cultured human dermal fibroblasts

Background

Collagen is one of the major proteins of the skin and it is particularly important for its strength and resilience. Skin aging is a natural process that is characterized by the decrease and fragmentation of collagen in the dermis. Oral supplementation with collagen peptides has been clinically shown to have a positive effect on the skin condition. However, the mechanisms of aging-related changes synthesized by cells exposed to collagen are currently not well understood. Therefore, in this in vitro study, the mechanisms associated with collagen, elastin, and versican in human dermal fibroblasts were investigated after exposure to collagen peptides.

Methods

The effects of different concentrations of collagen peptides on cell viability and metabolism were analyzed. For gene expression analysis, human dermal fibroblasts were treated with collagen peptides. This was then followed by RNA extraction and DNA synthesis. Gene expressions of collagen type 1 (COL1A1), elastin (ELN), and versican (VCAN) were quantified by quantitative reverse transcription polymerase chain reaction (RT-qPCR). In addition, collagen levels were analyzed by confocal scanning laser microscopy using immunostaining.

Results

Collagen peptides tested in the study increased the expression of the relevant COL1A1, ELN, and VCAN genes in human dermal fibroblasts (p < 0.005). Furthermore, confocal microscopy showed increased collagen expression in the dermal fibroblast culture after treatment with the collagen peptides (p < 0.005).

Conclusion

These data provide cell-based evidence for the beneficial effects of exposure to collagen peptides on the skin's collagen content and on the molecules that provide firmness and elasticity. This may support the hypothesis that collagen peptides are important for maintaining extracellular matrix (ECM) structure and skin regeneration.

The potential of Paeonia lactiflora pall seeds oil as a pure natural cosmetics raw material: In Vitro findings

BACKGROUND

As a traditional Chinese herbal medicine, Paeonia lactiflora Pall is rich in various active ingredients such as polysaccharides and total flavonoids while having ornamental value. It has potential application value in the development of food and cosmetics.

OBJECTIVE

To study the in vitro efficacy of Paeonia lactiflora Pall seeds oil.

METHODS

Firstly, the levels of linolenic acid and linoleic acid in Paeonia lactiflora Pall seeds oil were quantified using gas chromatography. The impact of Paeonia lactiflora Pall seeds oil on the proliferation rate of B16F10 cells was assessed through the CCK-8 method, while the melanin content of B16F10 cells was determined using the sodium hydroxide lysis method. The inhibitory effects of Paeonia lactiflora Pall seeds oil on elastase, collagenase and hyaluronidase were evaluated by biochemical techniques in vitro. Lastly, the hen's egg chorioallantoic membrane test (HET-CAM) was conducted to confirm the absence of eye irritation caused by Paeonia lactiflora Pall seeds oil.

RESULTS

Paeonia lactiflora Pall seeds oil within a certain volume concentration range (0.5%-4%) had no effect on the proliferation of B16F10 cells. Paeonia lactiflora Pall seeds oil showed significant inhibition of elastase, collagenase and hyaluronidase. Notably, the highest concentration tested, 4% Paeonia lactiflora Pall seed oil, yielded the most pronounced outcomes without causing any irritation.

CONCLUSION

A certain concentration of Paeonia lactiflora Pall seeds oil has a significant effect on decreasing the melanin content in B16F10 cells and inhibiting the activities of elastase, collagenase, and hyaluronidase, which can provide a reference for the development of pure natural cosmetics raw materials.

Essential oils extracted from nine different plants exhibit differential effects on skin antioxidation and elasticity

Essential oils derived from plants are major ingredients in the medical and cosmetic industry. Here, we evaluated nine types of plant essential oils to identify potential candidates with antioxidant and elasticity-enhancing properties. Seven essential oils showed at least 10% radical scavenging activity at the highest concentration. Essential oils extracted from Aster glehnii, Cinnamomum cassia, Citrus unshiu, Juniperus chinensis L., and Juniperus chinensis var. sargentii significantly enhanced fibroblast viability, and oils from Cit. unshiu, J. chinensis L., and J. chinensis var. sargentii significantly increased cell proliferation and migration. Expression of extracellular matrix proteins, including collagen 1, collagen 3, and elastin, were upregulated by J. chinensis L. and J. chinensis var. sargentii oil, which also significantly enhanced the contractile activity of skin cells in a three-dimensional gel contraction assay. The results suggest that J. chinensis L. and J. chinensis var. sargentii essential oils may be potential anti-wrinkling and anti-oxidative agents for future consideration of use in the medical and cosmetic industry.

An evaluation of the effectiveness of 'ULTRACOL 200' in enhancing nasolabial fold wrinkles through cutaneous repair

BACKGROUND

Injectable filler, a nonsurgical beauty method, has gained popularity in rejuvenating sagging skin. In this study, polydioxanone (PDO) was utilized as the main component of the ULTRACOL200 filler that helps stimulate collagenesis and provide skin radiant effects. The study aimed to evaluate and compare the effectiveness of ULTRACOL200 with other commercialized products in visually improving dermatological problems.

METHODS

Herein, 31 participants aged between 20 and 59 years were enrolled in the study. 1 mL of the testing product, as well as the quantity for the compared groups was injected into each participants face side individually. Subsequently, skin texture and sunken volume of skin were measured using ANTERA 3D CS imaging technology at three periods: before the application, 4 weeks after the initial application, and 4 weeks after the 2nd application of ULTRACOL200.

RESULTS

The final results of skin texture and wrinkle volume evaluation consistently demonstrated significant enhancement. Consequently, subjective questionnaires were provided to the participants to evaluate the efficacy of the testing product, illustrating satisfactory responses after the twice applications.

CONCLUSION

The investigation has contributed substantially to the comprehension of a PDO-based filler (ULTRACOL200) for skin enhancement and provided profound insight for future clinical trials.

Effect of poly-L-lactic acid and polydioxanone biostimulators on type I and III collagen biosynthesis

OBJECTIVE

Safe, effective, and biocompatible minimally invasive procedures with the potential to stimulate collagen production have been made to recover dermal thickness and skin quality. The main of this animal model experiment was to observe the effect of poly-L-lactic acid (PLLA) and polydioxanone (PDO) biostimulators in collagen I and III after hypodermal injection.

METHODOLOGY

Sixteen adult female rats (Wistar) were randomized into four groups and had dorsal treatment with: G1: hypodermic subcision (HS) only; G2: HS and PLLA hypodermic injection (HI), G3: HS and PDO HI; G4: Control, with no treatment.

RESULTS

In histochemical, it was observed hypodermal and dermal tissue in more organized thickness in G3 and in G4 when compared to G1 and G2. There was few difference in G1 compared to G4. The tissue of G2 showed irregularities in the arrangement of collagen fibers, less defined structure and lower distribution of type I collagen compared to the other groups. There is a greater tendency for the proportions of type III collagen among tissues treated with both biostimulators (G2 and G3). PLLA and PDO had relatively similar percentages of collagen when compared to G4. The amount of type I collagen was higher in tissues treated with subcision, while type III collagen was higher in tissues treated with both biostimulators.

CONCLUSION

G3 showed better performance in collagen production, although small, when compared with G2.

Evaluation of the anti-aging effects of Zinc-α2-glycoprotein peptide in clinical and in vitro study

BACKGROUND

Skin aging, characterized by the deterioration of skin density and elasticity, is a common concern among individuals seeking to maintain a youthful appearance. Zinc-α2-glycoprotein (ZAG) is secreted by various body fluids, and is associated with lipolysis and identified as an atopic dermatitis biomarker. This study evaluated the potential of ZAG peptides, which exert multiple benefits such as anti-aging.

MATERIALS AND METHODS

We conducted a 4-week clinical trial on patients with noticeable periorbital wrinkles (n = 22) using a ZAG peptide-containing product. The effects of the products on skin density, elasticity, and the depth of periorbital wrinkles were evaluated using Cutometer Dual MPA580, Ultrascan, and Antera 3D CS, respectively. The effect of ZAG peptides on UVB-treated keratinocyte cells was evaluated in vitro to understand the mechanisms underlying its effects against impaired skin barrier function, collagen degradation, and senescence. In addition, the effects of ZAG peptides on cell viability and expression of aging and skin barrier-related genes were assessed using cell counting kit assay and quantitative reverse transcription-polymerase chain reaction, respectively.

RESULTS

The patients demonstrated improved skin density, elasticity, and reduced periorbital wrinkles. Further, more than 85% patients scored the product as satisfactory regarding anti-aging effects. Furthermore, ZAG peptides reduced SA-β-gal staining, downregulated the senescence-related genes, and upregulated the skin barrier function-related genes in UVB-irradiated keratinocyte cells.

CONCLUSIONS

Our clinical and in vitro findings showed that ZAG peptides exert anti-aging effects and improve skin barrier functions, suggesting their promising potential as therapeutic agents to combat skin aging and improve skin health.

Electric currents of 448 kHz upregulate anti-senescence pathways in human dermal fibroblasts

BACKGROUND

Currently, finding new therapeutic strategies that reduce skin aging is a challenge for dermatologists and aesthetic doctors. In recent years, physical therapies have been included in the options for antiaging treatments; however, the biological bases of such treatments have scarcely been studied. One of these physical therapies is capacitive-resistive electric transfer (CRET) therapy. Previous studies have shown that subthermal treatment with CRET promotes the proliferation and migration of various cell types involved in skin regeneration, such as human ADSC (stem cells), fibroblasts, or keratinocytes.

OBJECTIVE

This study investigates the effects of in vitro treatment with CRET-Std (standard, non-modulated signal) or CRET-Mod (modulated signal) on cell proliferation and migration, markers of aging, and extracellular matrix production.

METHODS

Three types of human dermal fibroblasts were used: neonatal fibroblasts (HFn), replicative senescent fibroblasts (HFs), and adult fibroblasts (HFa). The effects of electric stimulation on cell proliferation and migration were studied through XTT and wound closure assays, respectively. The expression of the aging marker β-galactosidase was assessed using a colorimetric assay, whereas immunoblot, immunofluorescence, and ELISAs were carried out to analyze the expression levels of migration, aging, and extracellular matrix proteins.

RESULTS

The treatment with CRET-Std increased HFn and HFa proliferation, as well as migration in the three types of fibroblasts studied compared to those of the controls. Conversely, CRET-Mod did not modify either of these two processes with respect to the controls. Additionally, CRET-Std also reduced the cellular senescence markers β-gal, vimentin, p53, and p21 in all three types of human skin fibroblasts. In addition, the application of CRET-Std also induced fibronectin production in HFn and was able to stimulate ECM neocollagenesis.

CONCLUSION

CRET treatment improves a number of functions related to migration and proliferation, and it reduces age-related cellular changes in human dermal fibroblasts. Therefore, the use of this CRET therapy to reduce the signs of dermal aging and to promote tissue regeneration could be of interest.

Anti-aging Strategies and Topical Delivery of Biopolymer-based Nanocarriers for Skin Cancer Treatment

Environmental factors like UV radiation and epigenetic changes are significant factors for skin cancer that trigger early aging. This review provides essential information on cancer development concerning aging, the receptors involved, and the therapeutic targets. Biopolymers like polysaccharide, polyphenols, proteins, and nucleic acid plays a vital role in the regulation of normal cell homeostasis. Therefore, it is pertinent to explore the role of biopolymers as antiaging formulations and the possibility of these formulations being used against cancer via topical administrations. As UV radiation is one of the predominant factors in causing skin cancer, the association of receptors between aging and cancer indicated that insulin receptor, melatonin receptor, toll-like receptor, SIRT 1 receptor, tumor-specific T cell receptor and mitochondria-based targeting could be used to direct therapeutics for suppression of cancer and prevent aging. Biopolymer-based nanoformulations have tremendously progressed by entrapment of drugs like curcumin and resveratrol which can prevent cancer and aging simultaneously. Certain protein signaling or calcium and ROS signaling pathways are different for cancer and aging. The involvement of mitochondrial DNA mutation along with telomere shortening with a change in cellular energetics leading to genomic instability in the aging process can also induce mitochondrial dysfunction and epigenetic alterations leading to skin cancer. Therefore, the use of biopolymers as a topical supplement during the aging process can result in the prevention of cancer.

Evaluation of Wrinkle and Dermal Thickness in the Forearm before and after Picosecond Laser Therapy

Background

Skin wrinkles are generated as a result of the aging process. Dermal thickness underneath a wrinkle decreases absolutely. Approximately 20% of dermal thickness disappears as people become elderly. In recent times, people have attempted to reduce wrinkles using various procedures. Currently, available picosecond lasers in dermatology can create mechanical stress and the energy can be fractionated via diffractive lens arrays (DLA). An emerging indication for the picosecond laser includes photorejuvenation. Non-ablative laser skin rejuvenation therapy demonstrates the dermis can be safely reconstructed by only irradiating the skin surface with a laser. The clinical effects of picosecond pulse laser have been frequently reported, but few studies have included histological investigation.

Aims and Objectives

This study aimed to evaluate wrinkle and dermal thickness in the forearm before and after picosecond laser therapy.

Materials and Methods

Twenty healthy male and female subjects between 36 and 55 years old with wrinkles in the forearm who met the sample requirements and were willing to participate were recruited in this study. Clinical examination and biopsy for histopathological examination were carried out before and 4 weeks after therapy, then treatment was carried out using a picosecond laser.

Results

At 1-month follow-up, a significant improvement was noted in wrinkle and dermal thickness (P < 0.05).

Conclusions

This picosecond 755 nm alexandrite laser with DLA was found to be very effective in treating wrinkles, which was confirmed by a dermatologic assessment from forearm photographic assessment scaled and dermal thickness improvement.

Bioactive Compounds for Combating Oxidative Stress in Dermatology

There are extensive studies that confirm the harmful and strong influence of oxidative stress on the skin. The body's response to oxidative stress can vary depending on the type of reactive oxygen species (ROS) or reactive nitrogen species (RNS) and their metabolites, the duration of exposure to oxidative stress and the antioxidant capacity at each tissue level. Numerous skin diseases and pathologies are associated with the excessive production and accumulation of free radicals. title altered Both categories have advantages and disadvantages in terms of skin structures, tolerability, therapeutic performance, ease of application or formulation and economic efficiency. The effect of long-term treatment with antioxidants is evaluated through studies investigating their protective effect and the improvement of some phenomena caused by oxidative stress. This article summarizes the available information on the presence of compounds used in dermatology to combat oxidative stress in the skin. It aims to provide an overview of all the considerations for choosing an antioxidant agent, the topics for further research and the answers sought in order to optimize therapeutic performance.

Development of an ex vivo porcine skin model for the preclinical evaluation of subcutaneously injected biomacromolecules

Subcutaneous administration is used to deliver systemically-acting biotherapeutics, e.g. antibodies, and locally-acting biomacromolecules, e.g. hyaluronic acid. However, few preclinical models are available to evaluate post-injection behaviour in the tissue microenvironment. In vivo animal studies are costly, time-consuming, and raise obvious ethical concerns. In vitro models are cost-efficient, high-throughput solutions, but cannot simulate complex skin structure and biological function. An ex vivo model (containing hypodermis) with an extended culture period that enabled longitudinal studies would be of great interest for both the pharmaceutical and cosmeceutical industries. We describe the development of one such ex vivo model, using viable full-thickness porcine skin. Structural integrity was evaluated using a histological scoring system: spongiosis and epidermal detachment were identified as discriminating parameters. Ki67 and Claudin-1 expression reported on epidermal cell proliferation and barrier function, respectively and their expression decreased as a function of incubation time. After optimization, the system was used to investigate the fate/impact of subcutaneously administered hyaluronic acid (HA) formulations. The results showed that HA was localized at the injection site and adjacent adipocytes were well preserved during 5 days' incubation and confirmed that the full-thickness ex vivo porcine skin model could provide a platform for preclinical evaluation of subcutaneously injected biomacromolecules.

In vitro and in vivo efficacy of a cosmetic product formulated with new lipid particles for the treatment of aged skin

BACKGROUND

The cumulative oxidative damage causes an acceleration in the skin aging.

OBJECTIVES

To evaluate the ability of a new patented matrix of lipid particles (SIREN CAPSULE TECHNOLOGY™) to have superior anti-aging properties due to its high sensitivity to reactive oxygen species (ROS), testing its efficacy versus free or encapsulated vitamins.

METHODS

An in vitro study was conducted to evaluate the protective effects of lipid particles using menadione as an enhancer of oxidative stress. Subsequently, in vivo studies evaluated skin hydration, skin barrier function, and smoothness and wrinkle depth. For this purpose, gels containing free or encapsulated vitamins were used as controls.

RESULTS

In vitro, the SIREN CAPSULE TECHNOLOGY™ gel shows inhibitory activity against ROS production through menadione induction. In fact, at both tested concentrations, ROS production is lower than in the control samples (placebo, free vitamins, encapsulated vitamins). In vivo, the net effect of SIREN CAPSULE TECHNOLOGY™ gel versus the others permitted to conclude that lipid particles exert a higher skin moisturizing effect (20.17%) and a stronger effect in reducing transepidermal water loss (-16.29%) after 4 weeks of treatment. As for surface analysis, a gel based on SIREN CAPSULE TECHNOLOGY™ improves the skin texture in a similar way than gel containing encapsulated vitamins (Ra and Rz variations in 4 weeks).

CONCLUSIONS

SIREN CAPSULE TECHNOLOGY™ represents an advance and a successful strategy to develop cosmetic products for the treatment of skin conditions associated with an accumulation of ROS. SIREN CAPSULE TECHNOLOGY™ represents a result-oriented breakthrough in the effective delivery of active ingredients to the skin.

ΔNp63α-mediated epigenetic regulation in keratinocyte senescence

Keratinocyte senescence contributes to skin ageing and epidermal dysfunction. According to the existing knowledge, the transcription factor ΔNp63α plays pivotal roles in differentiation and proliferation of keratinocytes. It is traditionally accepted that ΔNp63α exerts its functions via binding to promoter regions to activate or repress gene transcription. However, accumulating evidence demonstrates that ΔNp63α can bind to elements away from promoter regions of its target genes, mediating epigenetic regulation. On the other hand, several epigenetic alterations, including DNA methylation, histone modification and variation, chromatin remodelling, as well as enhancer-promoter looping, are found to be related to cell senescence. To systematically elucidate how ΔNp63α affects keratinocyte senescence via epigenetic regulation, we comprehensively compiled the literatures on the roles of ΔNp63α in keratinocyte senescence, epigenetics in cellular senescence, and the relation between ΔNp63α-mediated epigenetic regulation and keratinocyte senescence. Based on the published data, we conclude that ΔNp63α mediates epigenetic regulation via multiple mechanisms: recruiting epigenetic enzymes to modify DNA or histones, coordinating chromatin remodelling complexes (CRCs) or regulating their expression, and mediating enhancer-promoter looping. Consequently, the expression of genes related to cell cycle is modulated, and proliferation of keratinocytes and renewal of stem cells are maintained, by ΔNp63α. During skin inflammaging, the decline of ΔNp63α may lead to epigenetic dysregulation, resultantly deteriorating keratinocyte senescence.

A Critical Review on the Role of Camel Milk in Multiple Health Outcomes

Camel milk has been demonstrated to be effective in treating a broad range of illnesses. Camel’s milk is regarded to have therapeutic properties because of its unique composition. Some people consider camel milk to be a precious commodity. White camel milk is made by combining fat and water. Several clinical studies have shown that camel’s milk is effective in treating a broad variety of diseases, including chronic ones. Most of the medicinal advantages of camel milk are included in this study. Camel Milk ingredients and qualities are similar to those found in mother’s milk, making it superior than cow’s milk. Insulin-like and protective proteins are found in abundance, along with lactose, which is the primary carbohydrate. It has anti-tumor qualities, and the robust immune system components assist combat disorders, including diabetes, autism, and diarrhea. It has been used by Nomads and Bedouins (Arabian tribals) for millennia because of these properties. The main objective of this review article is to demonstrate its various pharmacological roles. Camel’s milk is regarded as a vast medicinal property, as it contains a unique composition of bioactive moieties like lactose, proteins (Lactoferrin, Lactoperoxidase, Insulin, Casein), vitamins (A, B1, B2, C, D, E), minerals (Calcium, phosphorus, magnesium, iron, zinc and copper) carbohydrates etc. Most of the medicinal advantages of camel milk are covered in this paper, like its role in the management of autism, Crohn’s disease, allergic conditions, Hepatitis B and C, as antiviral and antibacterial agent. Hence, this study was planned to collect the updated latest information regarding use of camel’s milk, which will be very beneficial in the field of medicines and managing various ailments for the benefit of mankind.

Recent omics advances in hair aging biology and hair biomarkers analysis

Aging is a complex natural process that leads to a decline in physiological functions, which is visible in signs such as hair graying, thinning, and loss. Although hair graying is characterized by a loss of pigment in the hair shaft, the underlying mechanism of age-associated hair graying is not fully understood. Hair graying and loss can have a significant impact on an individual's self-esteem and self-confidence, potentially leading to mental health problems such as depression and anxiety. Omics technologies, which have applications beyond clinical medicine, have led to the discovery of candidate hair biomarkers and may provide insight into the complex biology of hair aging and identify targets for effective therapies. This review provides an up-to-date overview of recent omics discoveries, including age-associated alterations of proteins and metabolites in the hair shaft and follicle, and highlights the significance of hair aging and graying biomarker discoveries. The decline in hair follicle stem cell activity with aging decreased the regeneration capacity of hair follicles. Cellular senescence, oxidative damage and altered extracellular matrix of hair follicle constituents characterized hair follicle and hair shaft aging and graying. The review attempts to correlate the impact of endogenous and exogenous factors on hair aging. We close by discussing the main challenges and limitations of the field, defining major open questions and offering an outlook for future research.

Taurine accelerates the synthesis of ceramides and hyaluronic acid in cultured epidermis and dermal fibroblasts

Taurine is a sulfur-containing amino acid derivative that can be found in the majority of mammalian tissues. Taurine is also present in the skin and is involved in maintaining skin homeostasis by exerting osmoregulatory and antioxidant effects. Previous studies have indicated that taurine treatment is effective against age-, ultraviolet- or detergent-induced skin dysfunction. To determine the mechanism responsible for the beneficial actions of taurine in the skin, the present study aimed to evaluate the effects of taurine on epidermal components (ceramides and filaggrin) and on the dermal extracellular matrix, in three-dimensionally (3D) cultured epidermis and dermal fibroblasts, respectively. These cells were cultured in the presence of 3-50 mM taurine, and cells or culture medium were collected for analysis. The effects of taurine on transepidermal water loss (TEWL) in the skin and the expression of inflammatory cytokines, including IL-1α, IL-1β and IL-1 receptor antagonist, were investigated in acetone-treated 3D-cultured epidermis using a Tewameter and reverse transcription-quantitative PCR (RT-qPCR), respectively. The mRNA expression levels of MMP-1 and hyaluronic acid (HA) production were measured in skin dermal fibroblasts using RT-qPCR and ELISA, respectively. Taurine was found to suppress acetone-induced elevation in TEWL in 3D-cultured epidermis. Taurine also stimulated the mRNA expression of ceramide synthase 4 and filaggrin, a major structural protein in the stratum corneum, in 3D-cultured epidermis. In skin dermal fibroblasts, taurine inhibited the IL-1α-stimulated mRNA and protein expression of MMP-1. In addition, taurine treatment increased HA synthase-2 mRNA expression and in turn HA production. Results from the present study suggest that the protective effect of taurine on the skin is associated with the enhancement of epidermal barrier component expression and modulation of dermal extracellular matrix metabolism.