Search Results (233)

Lactic acid is a widely used component in cosmetics such as hair care products. High concentration of lactic acid or inappropriate enantiomeric form can have a negative impact on the skin. This study focuses on the development of methods of analysis for the separation, enantioseparation and determination of lactic acid in cosmetics and the confirmation of its enantiomeric form. Achiral reversed-phase high-performance liquid chromatography (RP-HPLC) on a C18 stationary phase and hydrophilic interaction liquid chromatography (HILIC) on an amino-propyl stationary phase, combined with diode array detection (DAD; 210 nm), were applied for analysis. Chiral HPLC-DAD on a teicoplanin-based stationary phase was an effective method for verification of the enantiomeric form, confirming L-lactic acid in tested samples. The complex samples were treated by solid-phase extraction using an anion-exchange adsorbent. Recovery studies showed good results, 76.1–91.8% (RSD ≤ 5.0%). The methods provide linearity of response in the concentration ranges tested (R² > 0.996). This study demonstrated several approaches to the HPLC-DAD determination of lactic acid and proposed an effective sample preparation procedure. Developed methods were rapid, simple and applicable in the routine analysis of cosmetics for monitoring the safety of products. Full article

Background: Hearing loss is a widespread sensory disorder affecting over 1.5 billion people worldwide, with the number projected to exceed 700 million by 2050. It imposes social and economic burdens across all ages and regions. Approximately half of adult cases are preventable, but the underlying causes are complex, with 75–80% due to autosomal recessive genetic factors and key roles for mutations in genes such as GJB2. Advances in sequencing technologies have accelerated gene discovery, but challenges remain in interpreting variants. Epigenetic mechanisms such as DNA methylation and histone modifications are increasingly recognized as crucial in auditory biology and could offer new biomarkers and therapeutic targets. Integrating epidemiological, genetic, and epigenomic data is essential to developing targeted prevention and treatment strategies to reduce the global burden of hearing loss. Methods: This narrative review examines recent genomic and epigenomic advances in hearing loss, with particular emphasis on molecular mechanisms, emerging diagnostic applications, and translational therapeutic opportunities. A comprehensive review of current epidemiological data, genetic studies, and epigenomic research was conducted using the peer-reviewed literature from international databases. Key areas of interest include inheritance patterns, molecular pathways, and recent advances in omics technologies. Results: Epigenetic mechanisms, including DNA methylation and histone modifications, are increasingly recognized as important regulators of cochlear development and hair cell survival, although much of the current evidence remains preclinical. Studies suggest that peripheral epigenetic signatures may serve as biomarkers for early diagnosis and risk stratification. Conclusions: Integrating established screening pathways with epidemiological trends and molecular knowledge offers a promising path toward precision medicine in hearing care. Connecting these domains is essential to developing equitable and effective interventions and addressing persistent global disparities in hearing health. This review highlights the evolving landscape of auditory genetics and epigenetics and outlines future directions for translational research and personalized therapy. Full article

Spirulina (Limnospira) is a cyanobacterium rich in bioactive compounds, making it a sustainable and innovative biotechnological ingredient for the cosmetics industry. It meets the demand for non-animal-derived, multifunctional products for skin and hair care. In this study, Spirulina biomass was incorporated into shampoo (0.01%) and emulsion (5%) formulations, which, along with their respective controls, were subjected to cosmetic stability tests. Color, pH, and viscosity were analyzed at the initial time (T0) and after 24 h, 30, 60, and 90 days, with samples exposed to different storage conditions, including oven incubation, sunlight exposure, refrigeration, and shelf storage, to simulate diverse conservation environments. Microbiological parameters were assessed, and all samples complied with the specifications required for cosmetics. Antioxidant activity was also measured at baseline and after 90 days of storage. Results showed that incorporating Spirulina biomass, even at low concentrations, significantly enhanced antioxidant activity in both shampoo and emulsion formulations compared with controls. After 90 days, the samples maintained their stability in terms of appearance, color, odor, pH, and viscosity under sunlight, refrigeration, and shelf storage conditions. In contrast, samples exposed to elevated temperatures (45 °C) exhibited changes in color, pH, and viscosity. These findings demonstrate the feasibility of incorporating Spirulina biomass into cosmetic shampoo and emulsion bases, highlight potential changes during storage, and provide guidance for developing novel cosmetics that incorporate Spirulina as an ingredient. Full article

Mutations in gap junction protein β-2 (GJB2), encoding Connexin 26 (Cx26), are the most common genetic cause of hearing loss, responsible for up to 50% of inherited non-syndromic cases worldwide. This review covers Cx26 from three perspectives: protein structure, mutant disease mechanisms, and treatment approaches. Structurally, 12 Cx26 subunits assemble into a gap junction channel connecting neighboring cells, enabling exchange of ions and signaling molecules; activity is regulated by calcium, pH, and CO₂. In the cochlea, Cx26 channels are required for the development of sound-sensing hair cells, maintenance of the electrical gradient needed for hearing, and energy supply during sound processing. GJB2 mutations cause hearing loss through three mechanisms, complete loss of functional protein, failure of channel assembly or membrane delivery, and abnormal channel gating, that damage cochlear cells. Severity ranges from profound congenital deafness to gradual decline, depending on which mutations are inherited. Gene therapy, genome editing, and pharmacological approaches are under investigation; cochlear implantation remains the current standard of care. Full article

Background: Alopecia areata (AA) is a chronic autoimmune disorder characterized by non-scarring hair loss and commonly coexists with other autoimmune diseases, suggesting systemic immune dysregulation. An association between AA and iron deficiency anemia (IDA) has been proposed, though prior studies have yielded conflicting results. Objective: Our aim was to examine the association between AA and IDA in a large, population-based cohort. Methods: We conducted a retrospective case–control study using data from a health maintenance organization (HMO) serving approximately 2.35 million individuals. We included 33,401 AA patients diagnosed between 2005 and 2019, matched 1:2 by age and sex with 66,802 controls without AA. Diagnoses of AA and IDA were confirmed through clinical coding by board-certified dermatologists and primary care physicians. Statistical analyses employed Kruskal–Wallis, Pearson’s χ², and Fisher’s exact tests. Results: IDA prevalence was significantly higher in AA patients than in controls (15% vs. 10%; OR 1.61, 95% CI: 1.55–1.67; p < 0.01). IDA preceded AA in 40% of cases, followed AA in 58%, and occurred concurrently in 2%. Limitations: The retrospective design limits causal inference. Conclusion: This study reinforces an association between AA and IDA, highlighting the need to assess and manage IDA as a potential treatable comorbidity in AA patients. Full article

Consumer demand for sustainable solutions to protect against hair damage is growing, yet quantitative studies linking molecular interactions to mechanical strengthening and structural changes remain limited. Here, we investigated the effectiveness of biotechnologically obtained Saccharomyces Lysate as a formulated active ingredient for hair care. Molecular modeling was used to explore the interactions between peptides in the lysate and keratin and suggested a network of intermolecular interactions at multiple sites on the proteins. Based on these observations, the strength and structural integrity of hair fibers treated with Saccharomyces Lysate were assessed using tensile measurements. We observed an improvement in the strength of bleached hair tresses, with an increased Young’s modulus compared to tresses treated only with water along with a significantly increased break stress. To visualize the hair fibers and their surface roughness after treatment with the lysate, we employed micro-computed tomography (µ-CT) offering high-resolution visualization of hair fibers. We introduce this method to qualitatively highlight surface appearance following application of a cosmetic product and complemented it with combing force measurements. Our results demonstrate the potential of this complex mixture of small peptides to strengthen hair integrity and we propose a hypothesis for its putative mode of action at the molecular level. Full article

Objectives: This study sought to assess quality of life (QoL) in Slovak breast cancer survivors and examine its association with treatment modalities and sociodemographic factors. Methods: This cross-sectional observational study included 244 Slovak female breast cancer survivors (stages IA–IIIC). Participants were aged 25–85 years, ECOG 1–2, without synchronous malignancies or severe comorbidities. Data were collected using the EORTC QLQ-C30 and breast cancer-specific module. Results: Mean global health status/QoL indicated a moderate QoL level (51.67). Emotional and cognitive functioning were relatively preserved, whereas social and role functioning were more impaired. The most prominent symptoms included insomnia, fatigue, dyspnoea, and pain. Breast cancer-specific domains showed relatively high body image scores but marked impairment in sexual activity and future perspective. Severe symptoms included hair loss, upper limb problems and systemic side effects of therapy. Significant differences were observed across functional domains and symptoms (p < 0.001). Chemotherapy was associated with better role functioning (p = 0.011), lower pain (p = 0.043) and insomnia (p = 0.012), but also with higher levels of hair loss (p = 0.003); however, these findings should be interpreted with caution due to potential confounding factors. Radiotherapy was associated with higher social functioning, body image and future perspective (p = 0.007 for all), but also with increased breast symptom severity (p = 0.044). Sociodemographic factors, particularly place of residence and education level, were significantly associated with overall QoL. Conclusions: Slovak breast cancer survivors report moderate overall QoL, with emotional and cognitive functioning relatively preserved, but social, role and sexual domains impaired. Treatment modalities and sociodemographic factors are associated with differences in specific QoL domains, highlighting the need for targeted, context-sensitive supportive care. The findings also underscore the importance of oncology nursing in survivorship care, particularly in addressing physical, social and sexual domains and key symptoms such as insomnia, fatigue and pain. Targeted psychosocial and educational support, along with culturally sensitive QoL assessment, may help improve patient-centred outcomes in breast cancer survivors in Central and Eastern Europe. Full article

Background: Alopecia areata (AA) is an autoimmune disease characterized by diverse patterns of non-scarring hair loss. Due to its susceptibility to immune dysregulation and psychological stress, there is growing speculation regarding the potential role of SARS-CoV-2 infection and the COVID-19 pandemic in its development, recurrence, or exacerbation. This retrospective study aimed to evaluate patients affected by AA from a single dermatological center, specifically focusing on the impact of the COVID-19 pandemic on hospitalization rates. Methods: Data comprising demographic characteristics, disease subtype, number, and duration of hospitalizations were digitized and statistically analyzed. The five-year period prior to the pandemic (2015–2019) was compared with the subsequent four years (2020–2023) to assess any changes. Results: The study involved 428 individuals (256 children and 172 adults), with a slight predominance of women (68.2%). The median ages in adults and children were 39.13 years and 8.66 years, respectively. Following the pandemic, there was a 13.81% decrease in the mean age among adult males. Hospitalizations surged by 207.62% after the pandemic, increasing from 223 to 686 admissions. Additionally, the diagnosis of alopecia areata totalis increased significantly by 55.6%. The residential distribution of pediatric patients also shifted notably, with 72.16% residing in urban areas and 27.84% in rural areas between 2020 and 2023. Conclusions: The significant increase in hospitalization rates and the diversity of disease subtypes observed in this study may suggest a potential correlation between COVID-19 and the development or altered course of alopecia areata. A deeper understanding of this association could enhance treatment outcomes in dermatology, ultimately improving patient care. Full article

The emergence of multifunctional wound dressings represents a significant transformation in the care of cutaneous tissue injuries, providing advanced solutions that surpass traditional dressings. This study is poised to fabricate multifunctional hydrogels through dual-dynamic cross-linking, integrating antibacterial and antioxidant properties, which are capable of accelerating wound healing while improving therapeutic outcomes. The hydrogel, which exhibits excellent adhesion, rapid self-healing ability, and on-demand removability, was synthesized employing poly(vinyl alcohol) (PVA)–borax as the backbone, followed by the incorporation of silk fibroin (SF), tannic acid (TA), and chitosan (CS). Total saponins of Panax notoginseng flower buds (PNF) with anti-inflammatory and angiogenic properties were loaded in porous structural materials yielding the PBCTS@PNF hydrogel. The prepared hydrogel exhibited outstanding antioxidant properties and cytocompatibility, along with favorable antibacterial capabilities, achieving inhibition rates of 84.30 ± 2.34% against Escherichia coli (E. coli) and 98.12 ± 0.76% against Staphylococcus aureus (S. aureus), respectively. Animal experiments demonstrated that PBCTS@PNF significantly reduced inflammation and promoted multidimensional tissue regeneration, encompassing re-epithelialization, neovascularization, and hair follicle regeneration, along with ordered collagen matrix organization, leading to substantially accelerated wound healing. The multifunctional PBCTS@PNF hydrogel provides a potent bioengineered therapeutic platform for wound healing management through the synergistic interplay among antibacterial, anti-inflammatory, and tissue regenerative functionalities. Full article

Background: Deep burns in pediatric population often require split-thickness skin grafts (STSGs) and the identification of an optimal donor site is crucial to minimize morbidity, accelerate healing and reduce short- and long-term complications. The scalp appears to be increasingly used in clinical practice, but evidence remains limited, despite the promise of novel bioengineering and regenerative approaches. Methods: A systematic review about the use of scalp for STSG in pediatrics was conducted across PubMed, Scopus, and Cochrane (2005–2025). Clinical outcomes considered were donor-site healing time, early and late complications, perioperative practices, and quality of scars. Results: Four studies met the inclusion criteria (n = 417, mean age 2.9–7.3 years) with follow-up periods up to 27 years. Epithelialization occurred between 7 and 25 days. Early complications included folliculitis (up to 44% in certain hair types) and delayed healing (n = 13; 52%). A rigorous harvesting technique is needed to avoid preventable complications. Late sequelae included alopecia (1.6% to 33%—the latter largely unperceived by patients) and hypertrophic scarring (1.6–4%). Scar quality was rated good in >80% of cases. Conclusions: Evidence supports the scalp as a safe, efficient, and cosmetically favorable donor site for pediatric STSG. Based on evidence and clinical experience, we propose the first structured scalp-donor management algorithm to optimize safety, reduce complications, and standardize perioperative care in the management of pediatric burns. Full article

Skin aging, pigmentation disorders and skin barrier dysfunction are strongly associated with oxidative stress, chronic inflammation and extracellular matrix degradation. In this context, plant sprouts have gained popularity as a rich source of bioactive compounds and are becoming promising candidates for dermatological applications. The aim of this review was to summarize current scientific research on the potential of sprout extracts in skin care and to identify the biological mechanisms underlying their dermatological activity. A comprehensive literature search was conducted in Medline, Scopus, and Google Scholar databases up to February 2026. Studies assessing the effects of topical sprout extracts on skin structure, inflammation, pigmentation, and hair growth were included. A total of 31 studies met the inclusion criteria and were subjected to qualitative analysis. Available evidence indicates that sprout extracts have multifaceted effects relevant to skin health, including stimulation of collagen synthesis, inhibition of matrix metalloproteinases, improvement of epidermal hydration, melanogenesis, and suppression of inflammatory signaling pathways. These effects are largely attributed to bioactive compounds such as phenolic acids, flavonoids, isothiocyanates, and other antioxidant phytochemicals, which exhibit antioxidant, anti-inflammatory, and anti-aging properties. Preliminary clinical studies suggest that ingredients derived from sprouts may improve skin elasticity, hydration, and photoprotection. Although most of the evidence comes from in vitro and animal studies, it preliminarily supports the emerging concept of “food for skin” and highlights the potential of sprouted plant materials as multifunctional ingredients in dermatology. Full article

This study explores Serbia’s rich ethnopharmacological heritage by systematically documenting the traditional use of medicinal plants for treating skin diseases during the 19th and 20th centuries. Drawing on key ethnographic sources—including monographs, scholarly articles, and field reports—the review analyzes historical records of folk medicine practices and their cultural contexts. A total of 164 plant species from 63 botanical families, as well as one mushroom species, were identified as being used in the treatment of skin-related conditions classified according to the International Classification of Primary Care. Reported ailments were grouped into three main categories: hair and scalp disorders, bites, and various inflammatory skin conditions such as eczema and psoriasis. Remedies for wound healing were the most frequently documented, both in terms of application and diversity of plant species employed. By preserving and systematizing this historical knowledge, the study provides a valuable foundation for future pharmacological and dermatological research, highlighting the continued relevance of traditional remedies in modern clinical practice. Full article

Heavy metals including mercury (Hg), lead (Pb), cadmium (Cd), and arsenic (As) remain significant global toxins due to their environmental persistence, widespread anthropogenic release, and serious biological effects. This review consolidates current understanding of their natural and industrial sources, environmental cycling, human exposure routes, and population-level vulnerabilities. It covers their toxicokinetics and toxicodynamics, emphasizing species-specific absorption, distribution, and injury mechanisms, including oxidative stress, thiol binding, mitochondrial dysfunction, endocrine disruption, and cancer risk. Clinical signs range from subtle neurocognitive impairment and kidney damage to severe acute poisoning. The review evaluates evidence-based approaches to risk assessment and biomonitoring, such as blood, urine, hair, and speciation tests, noting issues, including unvalidated provoked testing. Treatment focuses on removing exposure, providing nutritional support, and offering supportive care, with chelation therapy reserved for specific cases. It explains the chemistry, pharmacology, and roles of chelating agents—ALA, DMSA, DMPS, Cys, GSH, and physiologic thiols, comparing their effectiveness, limitations, and costs for various metals. Emerging therapies, precision toxicology, and public health strategies are discussed within a prevention-focused context. Unlike prior reviews focused primarily on toxic mechanisms or isolated clinical management, this review integrates mechanistic toxicology, biomarker interpretation and speciation, evidence-based clinical care, and ethical, cost-conscious decision-making within a single translational framework. This narrative review synthesizes foundational and contemporary literature published through 2025, with particular emphasis on studies published since 2000 that inform toxicokinetics, biomarker interpretation, diagnostics, clinical management, and prevention. Full article

Background and Objectives: Burnout is highly prevalent among emergency and acute care healthcare workers (HCWs), yet biological correlates remain debated because candidate biomarkers are strongly shaped by circadian timing, shift work, sleep loss, and overlapping affective symptoms. We mapped post-2018 evidence of biological biomarkers assessed alongside validated burnout measures in emergency department (ED), emergency medical services (EMS), and related acute care settings. Specifically, we asked whether reproducible biological correlates of burnout can be identified in emergency and acute-care healthcare workers when biomarker endpoint class and sampling context are systematically considered. Materials and Methods: We conducted a systematic scoping review with evidence mapping (PRISMA-ScR). PubMed/MEDLINE and the MDPI platform were searched for English-language studies published from 2018 onward (through January 2026). Eligible quantitative studies enrolled ED/EMS or acute care HCWs, assessed burnout using validated instruments, and reported at least one biological biomarker. Evidence was charted by biomarker domain and endpoint class (basal measures, stress reactivity paradigms, and chronic indices such as hair-based markers). Results: Overall, 19 studies were included in mapping/synthesis. Biomarker selection clustered around the hypothalamic–pituitary–adrenal axis (cortisol; n = 10/19), with fewer studies focused on autonomic function (heart rate variability; n = 2/19) and immune–inflammatory markers (n = 2/19), and single-study coverage for oxidative stress (n = 1/19), cardiometabolic candidates (n = 1/19), cellular aging (n = 1/19), neuroglial/multi-system candidates (n = 1/19), and feasibility-oriented multi-marker designs (n = 1/19). Reported associations with burnout were heterogeneous in direction and magnitude, but were more interpretable when endpoint class, timing anchors, and shift/sleep-related covariates were explicitly reported. Rates of confounder adjustment were low across studies (e.g., only 3/19 reported multivariable adjustment, and none systematically measured sleep or circadian factors), substantially limiting interpretability. Conclusions: The 2018+ literature does not support a single reproducible biomarker for burnout in emergency and acute care workforces. Evidence instead suggests multi-system dysregulation that is highly sensitive to endpoint class, sampling timing, and contextual confounding. Future studies should prioritize timing-anchored repeated-measures protocols across shift and recovery windows, jointly model sleep/circadian factors and depressive symptoms, and evaluate multi-marker panels and intervention responsiveness. Full article

Hair loss, or alopecia, constitutes a significant and prevalent concern affecting individuals worldwide. Despite the availability of numerous commercial solutions, many individuals continue to experience substantial psychological distress, leading to adverse impact on personal relationships, social interactions, and occupational performance. The limitations of conventional treatments, such as oral medication with potential systemic side effects and topical applications with localized adverse events, have driven the exploration of alternative therapies. Emerging localized injectable treatments for hair regrowth (PRP, stem cells, exosomes) offer a promising avenue for addressing this persistent issue. These injectable therapies hold the potential to minimize the systemic side effects often associated with oral medications, while also mitigating the localized adverse events that can arise from topical applications. This narrative review provides a comprehensive overview of the medical state-of-the-art in off-label injectable hair regrowth treatments, delving into the diverse range of available options. A critical component of this narrative review involves a thorough evaluation of relevant clinical studies, assessing the efficacy and safety profiles of these emerging therapies. Furthermore, detailed attention is given to injection techniques and administration protocols, crucial factors in optimizing treatment outcomes. These evolving therapies represent a significant advancement in the field of scalp regenerative medicine. By stimulating hair follicle reactivation, these treatments aim to promote sustained and natural hair growth, providing individuals with more effective and durable solutions. The enhanced safety profiles of these injectable therapies, compared to conventional systemic pharmacological treatments (minoxidil, finasteride), offer a substantial improvement in patient care, addressing a widespread clinical need. Full article