Daily Cosmetic Research Analysis
Methodological and mechanistic advances dominated today’s cosmetic and dermato-toxicology literature. An open-source ML-based tool quantified Langerhans cell migration to refine allergen risk assessment, a multi-model study identified an anti-glycation botanical blend and its pathways for skin aging mitigation, and a surgical series introduced an adjustable traction technique that improved tear trough outcomes without major complications.
Summary
Methodological and mechanistic advances dominated today’s cosmetic and dermato-toxicology literature. An open-source ML-based tool quantified Langerhans cell migration to refine allergen risk assessment, a multi-model study identified an anti-glycation botanical blend and its pathways for skin aging mitigation, and a surgical series introduced an adjustable traction technique that improved tear trough outcomes without major complications.
Research Themes
- Cosmetic safety and sensitization testing
- Anti-glycation cosmeceutical mechanisms
- Periorbital rejuvenation surgical innovation
Selected Articles
1. Development of image analysis tool to evaluate Langerhans cell migration after exposure to isothiazolinones.
Using an open-source QuPath-based, machine learning-assisted pipeline, the authors automated detection of epidermal layers and Langerhans cell positions to quantify migration in ex vivo human skin after isothiazolinone exposure. Only octylisothiazolinone induced migration toward the basal lamina consistent with sensitizers, and the water vehicle itself affected migration patterns.
Impact: Provides a validated, reproducible and open tool to objectively quantify a key sensitization step, addressing regulatory needs for non-animal cosmetic safety assessment.
Clinical Implications: Enables more objective preclinical assessment of potential skin sensitizers in cosmetics and household products, potentially reducing false negatives/positives and guiding safer ingredient selection.
Key Findings
- Developed and validated open-source QuPath/ML scripts for automated detection of skin layers and Langerhans cell positions.
- Ex vivo human skin exposed for 24 hours to four isothiazolinones showed vehicle-dependent effects on Langerhans cell migration.
- Only octylisothiazolinone induced migration toward the basal lamina consistent with known sensitizer behavior; methylisothiazolinone and benzothiazolinone showed different patterns.
Methodological Strengths
- Open-source, reproducible workflow using QuPath with machine learning
- Human ex vivo skin organo-culture model
- Automated layer and cell position detection reduces subjectivity and labor
Limitations
- Number of human donors and replicates not specified; preliminary dataset
- Short exposure window (24 hours) and limited chemical set
- Translational correlation with clinical ACD incidence not established
Future Directions: Expand to larger panels of sensitizers/vehicles, report donor variability, align metrics with OECD guidelines/AOPs, and evaluate predictive performance against clinical patch-test data.
Incidence of allergic contact dermatitis (ACD) is rising worldwide as a consequence of raising chemical exposure, especially from biocides present in common water-based products such as cosmetics and household products. Understanding the biological processes involved in skin sensitization is crucial to mitigating ACD. Migration of Langerhans cells to the basal lamina of the skin is a key step in sensitization. Animal testing for sensitization has been largely replaced by alternative in vitro methods due to ethical concerns. This study presents an open-source program using QuPath software enhanced with machine learning to analyze Langerhans cells migration in immunostained human skin samples. We validated scripts for automated detection of skin layers and Langerhans cells position, enabling accurate, reproducible analysis. An ex vivo human skin organo-culture model was used to test Langerhans cells migration after 24-h exposure to four different isothiazolinones diluted in water at different concentrations. The initial results show that the water vehicle has an impact on Langerhans cells migration. We also observed a different Langerhans cells migration pattern for methylisothiazolinone and benzothiazolinone exposed skin compared to octylisothiazolinone. The results suggest that only octylisothiazolinone can induce Langerhans cells migration to the basal lamina of the epidermis as described for sensitizers. This automated approach represents a advancement in ACD risk assessment by minimizing the subjectivity and labor involved in Langerhans cells analysis, providing a valuable tool for future research.
2. Mixtures of EGCG, bamboo leaf flavonoids, and broccoli seed water extracts exhibit anti-glycation and skin-protective effects.
A natural blend of EGCG, bamboo leaf flavonoids, and broccoli seed extracts reduced AGEs and RAGE expression in keratinocytes, modulated 576 genes, and downregulated ROS1 and MAPK/NF-κB signaling. Anti-glycation and skin-protective effects were confirmed in zebrafish and mouse models, supporting EBB as a candidate anti-aging functional ingredient.
Impact: Links a well-characterized botanical combination to specific anti-glycation pathways (RAGE/ROS1, MAPK/NF-κB) across multiple models, informing cosmeceutical development with mechanistic depth.
Clinical Implications: Supports formulation of anti-glycation skincare or nutraceuticals; highlights targetable pathways for mitigating glycation-driven skin aging pending human trials.
Key Findings
- Identified glucoraphanin, sinapine, and orientin within the EBB blend via HPLC/UHPLC-MS/MS.
- EBB reduced AGE formation and RAGE expression in HaCaT cells and regulated 576 differentially expressed genes.
- EBB downregulated ROS1 and key signaling proteins (p-p38, p-ERK1/2, p-p65, TNF-α), and reduced AGE accumulation and skin damage in zebrafish and mouse models.
Methodological Strengths
- Multi-model approach (keratinocyte cell line, zebrafish, mouse)
- Comprehensive omics with RNA-seq plus qRT-PCR/Western validation
- Chemical characterization of actives by HPLC and UHPLC-MS/MS
Limitations
- Preclinical models; absence of human clinical efficacy and safety data
- Dose translation and percutaneous bioavailability not addressed
- Formulation stability and synergism within complex mixtures require further study
Future Directions: Conduct dose-finding human trials, assess dermal pharmacokinetics and safety, and benchmark efficacy versus standard anti-glycation actives in controlled clinical studies.
BACKGROUND: Skin aging is a multifaceted process. Glycation significantly contributes to skin aging and the development of complications. Researchers are currently investigating various substances, particularly those from natural sources, to combat skin glycation. PURPOSE: This study aimed to comprehensively evaluate the anti-glycation effect of a new natural combination, EBB, which includes (-)-epigallocatechin-3 gallate (EGCG), bamboo leaf flavonoids, and broccoli seed water extracts, using cell and animal models and to explore its potential anti-glycation mechanism. METHODS: The components of EBB were identified using HPLC and UHPLC-MS/MS. Additionally, a glycation cell model induced by glyceraldehyde, advanced glycation end products (AGEs), and methylglyoxal was established in HaCaT cells to evaluate the efficacy of EBB in alleviating glycation. Differential genes, signalling pathways, and biological processes were analysed through RNA sequencing to explore the mechanisms of the anti-glycation effects of EBB, which were further validated using qRT-PCR and Western blotting. Finally, the protective effects of EBB against glycation and skin damage were assessed in zebrafish and mouse in vivo models through histological studies and the measurement of various skin physiological parameters. RESULTS: Glucoraphanin, Sinapine and orientin were identified in EBB, which effectively reduced the formation of AGEs and decreased the expression level of the RAGE protein in HaCaT cells. Transcriptomic analyses revealed that EBB regulated the expression of 576 differentially expressed genes. These genes were enriched in various biological processes, such as chronic inflammation and immune responses, and participated in the regulation of multiple signalling pathways, including TNF. Glycation upregulated the expression of the ROS1 gene and protein, while EBB reversed this effect. Furthermore, EBB attenuated the glycation response by downregulating the expression levels of proteins such as p-p38, p-ERK1/2, p-p65, and TNF-α. Additionally, the reduction of AGE accumulation by EBB was confirmed in a zebrafish model. Similarly, histological analyses of mouse skin tissue and various physiological parameters demonstrated that EBB significantly mitigated damage induced by glycation. CONCLUSIONS: Our results show that EBB effectively inhibited glycation reactions. The mechanism of action may involve the reduction of inflammation by downregulating the expression levels of RAGE and ROS1, thereby decreasing the accumulation of AGEs in keratinocytes and alleviating skin damage. This paves the way for the potential application of EBB as a valuable anti-glycation functional ingredient in the food and cosmetic industries.
3. Application of Wide, Adjustable External Traction Fixation in Conjunctival Approach Orbital Fat Reposition Surgery.
In 69 patients undergoing transconjunctival orbital fat repositioning augmented by wide, adjustable external traction, tear trough grades improved markedly from 3.19 to 0.84 at a mean 7.4-month follow-up, with no major complications. The technique appears safe and effective for palpebral bags/tear trough deformity without significant skin laxity.
Impact: Introduces a practical modification that enhances control during fat repositioning and yields significant, complication-free improvements in tear trough deformity across a sizable consecutive series.
Clinical Implications: May standardize tear trough correction for selected patients, improving reproducibility and patient satisfaction while maintaining a favorable safety profile.
Key Findings
- Retrospective case series of 69 patients (18–45 years) with minimum 6-month follow-up (mean 7.4 ± 1.2 months).
- Modified Barton tear trough grade improved from 3.19 ± 0.69 preoperatively to 0.84 ± 0.64 postoperatively (P < 0.001).
- No major complications were observed during follow-up.
Methodological Strengths
- Objective grading with modified Barton classification
- Consecutive series with minimum 6-month follow-up
- Clear inclusion (limited skin laxity) and standardized technique
Limitations
- Retrospective, single-center/surgeon without a control group
- Short- to mid-term follow-up; long-term durability unknown
- Generalizability limited to patients without significant skin laxity
Future Directions: Prospective comparative trials versus conventional techniques, longer follow-up, and inclusion of patient-reported outcomes and cost-effectiveness.
BACKGROUND: The correction of tear trough deformities is a significant challenge. The aim of this study is to present a new technique of using wide, adjustable external traction fixation in conjunctival approach orbital fat reposition surgery. METHODS: This is a retrospective case series study conducted on 69 patients, aged 18 to 45 years, who underwent surgery for palpebral bags and tear trough deformities (TTD) between October 2022 and March 2024. During surgery, wide, adjustable external traction fixation was used in conjunctival approach orbital fat reposition surgery. The modified Barton classification is used to evaluate the tear trough deformity preoperatively and postoperatively. Patient satisfaction and complication were evaluated. RESULTS: Sixty-nine patients were enrolled in the study and completed the minimum follow-up period of 6 months. The mean follow-up period was 7.4 ± 1.2 months. There was a significant improvement in the grading of TTD before and after surgery, with an average preoperative TTD grade of 3.19 ± 0.69 and a postoperative grade of 0.84 ± 0.64 ( P < 0.001). No major complication was observed during the follow-up period. CONCLUSIONS: For patients with palpebral bags and tear trough deformities without significant skin laxity, transconjunctival orbital septum fat reposition surgery with wide, adjustable external traction fixation is a safe, stable, and effective surgical option and is worthy of broader adoption.