Real-world comorbidities of atopic dermatitis in the pediatric ambulatory population in the United States

Risk factors and temporal associations of progression of the atopic march in children with early-onset atopic dermatitis

BACKGROUND

Risk factors and the temporal relationship between atopic dermatitis (AD) and atopic march remain understudied.

OBJECTIVE

Determine risk factors for atopic march in early-onset AD patients and the temporality between AD and atopic march.

METHODS

We used the MarketScan Research Database for our retrospective cohort analysis from 2010 to 2018, comparing infants diagnosed with AD before age 1 with controls without early-onset AD. Primary outcomes were hazard ratios (HRs) for the development of asthma, allergic rhinitis, and food allergy.

RESULTS

Compared to 55,174 controls, higher proportions of the 27,228 AD patients developed asthma (19.21% vs 8.65%, P < .001), allergic rhinitis (28.27% vs 12.62%, P < .001), food allergy (16.00% vs 2.27%, P < .001), and all atopic triad conditions (10.69% vs 0.71%, P < .001). Among AD patients, higher proportions developed the atopic triad if they were male (HR 1.66, 95% confidence interval [1.45-1.90]), had severe disease (HR 3.16, [2.77-3.60]), or had family atopy history (HR > 3.40, P < .001 for all comparisons). Among AD patients, 20.1% developed allergic rhinitis.

LIMITATIONS

Our study was based on health care claims data.

CONCLUSION

Early-onset AD is associated with higher rates of developing atopic march conditions compared to controls. Particular attention should be paid toward risk factors and atopic march screening in early-onset AD patients.

Evaluation of dupilumab on the disease burden in children and adolescents with atopic dermatitis: A population-based cohort study

BACKGROUND

Dupilumab is the first and only biologic agent approved for the treatment of atopic dermatitis (AD) in pediatric patients aged from 6 months to 17 years. The study aimed to evaluate the impact of dupilumab on the occurrence of comorbidities in pediatric patients with AD.

METHODS

In this population-based cohort study, we utilized electronic health records from multiple healthcare organizations across the United States. Pediatric patients (<18 years of age) with a diagnosis of AD initiating dupilumab were propensity-score matched 1:1 to those initiating other systemic agents (azathioprine, cyclosporine, methotrexate, mycophenolate mofetil, or systemic corticosteroids). The primary outcomes were new-onset comorbidities emerging during the study period measured by the risk ratio (RR) and its confidence interval (CI). Subgroup analyses were stratified by age (0-5 years, 6-11 years, and 12-17 years), sex, and race.

RESULTS

A total of 3575 pediatric patients with AD treated with dupilumab were matched to 3575 patients treated with other systemic agents. The dupilumab cohort was associated with a lowered risk of new-onset atopic comorbidities (including asthma [RR, 0.72; 95% CI, 0.59-0.89] and allergic rhinitis [RR, 0.62; 95% CI, 0.52-0.74]), infections (e.g., skin and soft tissue infection [RR, 0.70; 95% CI, 0.63-0.76] and respiratory tract infection [RR = 0.56; 95% CI, 0.51-0.61]), psychiatric disorders (e.g., mood disorder [RR, 0.52; 95% CI, 0.39-0.70] and anxiety [RR, 0.57; 95% CI, 0.46-0.70], sleep disturbance [RR, 0.60; 95% CI, 0.47-0.77]), neurologic and developmental disorders (e.g., attention deficit hyperactivity disorder [RR, 0.54; 95% CI, 0.38-0.75]). Furthermore, the positive effects are found to be more pronounced in younger children (aged 0-5 years) with AD.

CONCLUSIONS

Treatment with dupilumab compared to systemic agents resulted in reductions in AD-related comorbidities in pediatric patients.

Genetic association of lipid and lipid-lowering drug target genes with atopic dermatitis: a drug target Mendelian randomization study

Observational studies suggest dyslipidemia as an atopic dermatitis (AD) risk factor and posit that lipid-lowering drugs may influence AD risk, but the causal link remains elusive. Mendelian randomization was applied to elucidate the causal role of serum lipids in AD and assess the therapeutic potential of lipid-lowering drug targets. Genetic variants related to serum lipid traits and lipid-lowering drug targets were sourced from the Global Lipid Genetics Consortium GWAS data. Comprehensive AD data were collated from the UK Biobank, FinnGen, and Biobank Japan. Colocalization, Summary-data-based Mendelian Randomization (SMR), and mediation analyses were utilized to validate the results and pinpoint potential mediators. Among assessed targets, only Proprotein Convertase Subtilisin/Kexin Type 9 (PCSK9) was significantly linked to a reduced AD risk, corroborated across three separate AD cohorts. No association between serum lipid concentrations or other lipid-lowering drug targets and diminished AD risk was observed. Mediation analysis revealed that beta nerve growth factor (b-NGF) might mediate approximately 12.8% of PCSK9's influence on AD susceptibility. Our findings refute dyslipidemia's role in AD pathogenesis. Among explored lipid-lowering drug targets, PCSK9 stands out as a promising therapeutic agent for AD.

Humanistic and Economic Burden of Atopic Dermatitis in Pediatric Patients in Spain: A Systematic Review

Atopic dermatitis (AD) is a chronic, inflammatory skin disease affecting all age groups, particularly children. This systematic review provides an overview of the humanistic and economic disease burden in the pediatric population with AD in Spain. The evidence, collected from 11 observational studies published over the past 10 years, exhibits the most common characteristics of the patients, disease burden, patient-reported outcomes, use of resources, and treatment patterns. The burden of AD extends beyond physical symptoms, with associated comorbidities such as asthma and impaired health-related quality of life and mental health disorders, particularly in severe cases. Traditional therapies, primarily topical corticosteroids, face adherence and efficacy challenges. Despite promising innovative treatments and available biological therapies, their use is still limited in the pediatric population. The findings of the present review highlight the scarce scientific evidence on the economic burden of pediatric AD, as well as the most updated humanistic evidence on this disease. At the same time, the need for individualized care and innovative therapeutic interventions to address the multifaceted challenges of pediatric AD in Spain is evident.

Shared symptomatology between atopic dermatitis, ADHD and autism spectrum disorder: a protocol for a systematic scoping review

INTRODUCTION

Children with atopic dermatitis (AD) are more at risk for the neurodevelopmental disorders attention-deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) with parallel increases in global prevalences. Children afflicted with these conditions appear to share similar problems in sensory modulation but investigational studies on the underlying aetiology are scarce. This scoping review aims to find knowledge gaps, collate hypotheses and to summarise available evidence on the shared pathophysiology of AD, ADHD and ASD in children.

METHODS AND ANALYSIS

Our study will follow the methodological manual published by the Joanna Briggs Methodology for Scoping Reviews and will be reported in accordance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses Extension for Scoping Reviews. The following electronic databases will be searched for studies focused on children with AD and symptoms of ADHD and/or ASD: Medline ALL via Ovid, Embase, Web of Science Core Collection and the Cochrane Central Register of Controlled Trials via Wiley.

ETHICS AND DISSEMINATION

This review does not require ethics approval as it will not be conducted with human participants. We will only use published data. Our dissemination strategy includes peer review publication and conference reports.

Investigation of the Impact of Atopic Dermatitis (AD) on Stress, Depression, Anxiety, and Suicidal Ideation: A Systematic Review and Meta-Analysis

Skin inflammation, known as atopic dermatitis (AD), is often accompanied by various psychological disorders. The objective of this meta-analysis was to assess the impact of AD on stress, depression, anxiety, and suicidal ideation. A comprehensive search was conducted using nine databases. The risk of bias was evaluated using the Newcastle-Ottawa Scale (NOS). ORs were generated to analyze the results. Thirty-one articles met the requirements for inclusion, with 25 deemed of good quality and six of fair quality. A positive association was observed between AD and stress (OR = 1.546; 95% CI: 1.445-1.653; p = 0.000), depression (OR = 1.140; 95% CI: 1.127-1.153; p = 0.000), anxiety (OR = 1.080; 95% CI: 1.063-1.097; p = 0.000), and suicidal ideation (OR = 1.158; 95% CI: 1.144-1.172; p = 0.000). Interestingly, a significant publication bias was found in the outcomes related to depression and anxiety. This analysis suggests that AD significantly impacts the psychological well-being of patients. Stress, depression, anxiety, and suicidal ideation are among the mental health issues commonly associated with AD. Therefore, clinicians should consider mental health evaluations for patients with AD.

Bilateral Association Between Atopic Dermatitis® and Alopecia Areata: A Systematic Review and Meta-Analysis

This systematic review and meta-analysis aimed to explore the association between atopic Dermatitis® (AD) and alopecia areata (AA). A comprehensive search was conducted in PubMed, Embase, Cochrane, and Web of Science from the inception of each database to November 10, 2022 for relevant studies. As there is a potential bilateral association between the 2 diseases, we assessed the prevalence/incidence of AA in patients with AD and the prevalence/incidence of AD in patients with AA. A total of 29 studies involving 11,233,448 participants were included in this analysis. AA was the exposure factor in 23 studies, AD in 7 studies, and both in 1 study. The meta-analysis revealed that the prevalence of AD was 11.2% (7.7%-15.1%) in patients with AA, and the prevalence of AA was 3.2% (95% confidence interval [CI]: 0.0%-11.5%) in patients with AD. The incidence of AD in AA patients was found to vary with age (P = 0.07). Based on 7 studies, there was a significant association between AD and AA when AA was the exposure factor [odds ratio, OR, = 4.537 (95% CI: 2.409-8.544)]; based on 10 studies, there was also a significant association between AD and AA when AD was the exposure factor [OR = 2.643 (95% CI: 1.737-3.995)]. In conclusion, this meta-analysis demonstrated the 2-way association between AD and AA, providing a clinical reference for disease prevention and control.

Atopic Dermatitis and Cardiovascular Risk in Pediatric Patients: A Systematic Review and Meta-Analysis

Cardiovascular guidelines recommend early screening and preventative treatment for children with chronic inflammatory diseases. Atopic dermatitis (AD) is associated with cardiovascular risk in adults, but data in children are limited. We systematically searched for studies that examined the association between childhood AD and cardiovascular risk factors and outcomes. Data from 10 publications, including 577,148 individuals, revealed an association between AD and ischemic heart disease (n = 3, OR = 1.68, 95% confidence interval [CI] = 1.29-2.19) and diabetes (n = 4, OR = 1.31, 95% CI = 1.12-1.53), but this did not persist among studies that adjusted for potential confounders (n = 2, OR = 0.98, 95% CI = 0.35-2.75). Similarly, there was an association with lipid disorders but not across the entire population distribution (n = 7, OR = 1.24, 95% CI = 1.13-1.36, 95% prediction interval = 0.95-1.61). AD was not associated with hypertension (n = 5, OR = 1.15, 95% CI = 0.98-1.34, 95% prediction interval = 0.81-1.62) or stroke (n = 2, OR = 1.24, 95% CI = 0.94-1.62). Studies lacked detail on AD severity and important confounders such as body mass index, and the certainty of evidence was very low to low on the basis of GRADE (Grading of Recommendations, Assessment, Development and Evaluation) assessments. Currently, data do not support a clinically meaningful increase in cardiovascular risk for children with AD.

Increased prevalence of metabolic syndrome and non-alcoholic fatty liver disease in children with atopic dermatitis: A case-control study from northern India

BACKGROUND/OBJECTIVES

Atopic dermatitis (AD) is a chronic inflammatory skin disorder that affects children worldwide, with potential associations to metabolic syndrome (MetS) and non-alcoholic fatty liver disease (NAFLD). Limited research exists on the interplay between AD, MetS, and NAFLD in the pediatric population. This study aimed to investigate the prevalence and potential relationships among AD, MetS, and NAFLD in children.

METHODS

A case-control study design was employed, recruiting 50 children with AD (median age: 9.5 years) and 50 age- and sex-matched healthy controls (median age: 11.5 years, p = .051). Data on demographic characteristics, clinical features, disease severity, treatment history, anthropometric measurements, and laboratory evaluations were collected. MetS and NAFLD were diagnosed based on established criteria.

RESULTS

The prevalence of MetS was significantly higher in children with AD compared with controls (24% vs. 2%, p = .002). Significant differences for systolic blood pressure (p < .001), diastolic blood pressure (p = .012), and waist circumference (p = .040) were observed between AD patients and controls. Children with AD had higher triglyceride levels (p = .005). NAFLD was exclusively seen in moderate to severe AD cases (6% vs. 0%, p = .242). AD severity showed associations with increased body mass index (p = .020).

CONCLUSION

This study highlights the increased prevalence of MetS and the potential association with NAFLD in children with AD. The findings suggest that AD may contribute to the development of metabolic abnormalities at an early age. Further research is needed to elucidate the underlying mechanisms and explore preventive strategies for these interconnected conditions.

Effects of comorbid asthma and eczema on child and family quality of life

Paediatric chronic health conditions are associated with poorer psychological wellbeing and quality of life for children and families. This study investigated differences in child and parent/family quality of life between families of children with asthma only, eczema only, or both asthma and eczema, and tested predictors of child and parent/family quality of life. A convenience sample of 106 families completed parent-report measures of child and parent/family quality of life, child emotional and behavioural difficulties, parent adjustment and parenting practices. Between-groups ANOVAs indicated no differences for child quality of life, whereas parent/family quality of life was worse for those with eczema only compared to asthma only. Multiple linear regression revealed that child emotional difficulties predicted worse child quality of life, whereas worse parent adjustment, child emotional difficulties and eczema only (compared to both asthma and eczema) predicted worse parent quality of life. Results suggest that families of children with eczema may be at particular risk for impaired parent/family quality of life. Interventions that take a family-centred approach to improving child and parent adjustment should be investigated as an adjunct to medical treatment to reduce the impact of chronic health conditions on quality of life for children and families.

Risk of Inflammatory Bowel Disease in Patients With Atopic Dermatitis

Importance

Data on the association between atopic dermatitis (AD) and inflammatory bowel disease (IBD) are inconsistent. Few studies have examined the association of AD or AD severity with risk of ulcerative colitis (UC) and Crohn disease (CD) separately.

Objectives

To examine the risk of new-onset IBD, UC, and CD in children and adults with AD.

Design, Setting, and Participants

This population-based cohort study assessed patients with AD matched with up to 5 controls on age, practice, and index date. Treatment exposure was used as a proxy for AD severity. Data were retrieved from The Health Improvement Network, a UK electronic medical record database, for January 1, 1994, to February 28, 2015. Data analysis was performed from January 8, 2020, to June 30, 2023.

Main Outcomes and Measures

Outcomes of interest were incident IBD, UC, and CD. Logistic regression was used to examine the risk for each outcome in children and adults with AD compared with controls.

Results

A total of 1 809 029 pediatric controls were matched to 409 431 children with AD (93.2% mild, 5.5% moderate, and 1.3% severe). The pediatric cohort ranged in median age from 4 to 5 years (overall range, 1-10 years), was predominantly male (936 750 [51.8%] controls, 196 996 [51.6%] with mild AD, 11 379 [50.7%] with moderate AD, and 2985 [56.1%] with severe AD), and with similar socioeconomic status. A total of 2 678 888 adult controls were matched to 625 083 adults with AD (65.7% mild, 31.4% moderate, and 2.9% severe). The adult cohort ranged in median age from 45 to 50 years (overall range, 30-68 years) and was predominantly female (1 445 589 [54.0%] controls, 256 071 [62.3%] with mild AD, 109 404 [55.8%] with moderate AD, and 10 736 [59.3%] with severe AD). In fully adjusted models, children with AD had a 44% increased risk of IBD (hazard ratio [HR], 1.44; 95% CI, 1.31-1.58) and a 74% increased risk of CD (HR, 1.74; 95% CI, 1.54-1.97), which increased with worsening AD; however, they did not have increased risk of UC (HR, 1.09; 95% CI, 0.94-1.27) except for those with severe AD (HR, 1.65; 95% CI, 1.02-2.67). Adults with AD had a 34% (HR, 1.34; 95% CI, 1.27-1.40) increased risk of IBD, a 36% (HR, 1.36; 95% CI, 1.26-1.47) increased risk of CB, and a 32% (HR, 1.32; 95% CI, 1.24-1.41) increased risk of UC, with risk increasing with worsening AD.

Conclusion and Relevance

In this cohort study, children and adults with AD had an increased risk of IBD, with risk varying by age, AD severity, and IBD subtype. These findings provide new insights into the association between AD and IBD. Clinicians should be aware of these risks, particularly when selecting systemic treatments for AD in patients who may have coincident gastrointestinal symptoms.

Update on Atopic Dermatitis

Atopic dermatitis (AD) is a chronic inflammatory skin disorder with a lifetime prevalence of up to 20% which can occur at any age but is most common among children. There is a significant burden of pediatric AD in the primary care setting; thus, the ability to recognize and manage AD is of utmost importance to pediatricians. Treatment of AD requires a multifaceted approach based on a patient's severity including behavioral modifications, topical and systemic pharmacologic therapies, and phototherapy.

Malignancy risk in patients with atopic dermatitis: a population-based cohort study

BACKGROUND

Atopic dermatitis (AD) is associated with immunological dysfunction, which may influence cancer development. Previous studies of AD and cancer demonstrate inconsistent results and few of these studies examined children or AD severity and treatment.

OBJECTIVES

To determine malignancy risk among children and adults with AD.

METHODS

We conducted a cohort study using electronic health records data from UK general practices in The Health Improvement Network between 1994 and 2015. Children (< 18 years old) and adults (≥ 18 years old) with AD were matched on age, practice and index date to patients without AD. AD was categorized as mild, moderate or severe using treatments and dermatology referrals as proxies. The primary outcome was any incident malignancy, including in situ malignancy, identified using diagnosis codes and categorized into haematological, skin and solid organ malignancies. Secondary outcomes included specific malignancies: leukaemia, lymphoma, melanoma, nonmelanoma skin cancer (NMSC) and common solid-organ cancers.

RESULTS

Among 409 431 children with AD (93.2% mild, 5.5% moderate, 1.3% severe) and 1 809 029 children without AD who had median follow-up of 5-7 years, the incidence rates of malignancy were 1.9-3.4 and 2.0 per 10 000 person-years (PY), respectively. The adjusted risk of malignancy overall did not differ with respect to AD [hazard ratio (HR) 1.02 (95% confidence interval 0.92-1.12)]. Severe AD was associated with increased lymphoma risk [HR 3.18 (1.41-7.16), excluding cutaneous T-cell lymphoma (CTCL)], and mild AD was associated with increased NMSC risk [1.55 (1.06-2.27)]. Among 625 083 adults with AD (65.7% mild, 31.4% moderate, 2.9% severe) and 2 678 888 adults without AD who had median follow-up of 5 years, incidence rates of malignancy were 97.4-125.3 per 10 000 PY and 103.7 per 10 000 PY, respectively. The adjusted risk of any malignancy did not differ with respect to AD [HR 1.00 (0.99-1.02)]. However, adults with severe AD had a twofold higher risk of non-CTCL lymphoma. AD was also associated with slightly higher skin cancer risk [HR 1.06 (1.04-1.08)] and slightly lower solid cancer risk [0.97 (0.96-0.98)] but results varied by specific cancers and AD severity.

CONCLUSIONS

Epidemiological evidence does not support a strong overall malignancy risk in AD but lymphoma risk may be increased with severe AD.

Diagnosing Atopic Dermatitis in Skin of Color

Atopic dermatitis (AD) is a pruritic inflammatory skin disease that disproportionately affects skin of color patients. African American, Asian, and Hispanic patients carry disproportionate disease burdens, with increased prevalence, disease severity, and health care utilization. AD has a unique clinical presentation in skin of color patients, often with greater extensor involvement, dyspigmentation, and papular and lichenified presentations. Erythema is also more difficult to appreciate and can result in an underappreciation of disease severity in skin of color patients. In this review, we highlight the important manifestations of AD across all skin types, including nuances in treatment.

Obesity-induced immunological effects on the skin

There is an increasing prevalence of obesity globally. Equally, the significance of maintaining a healthy body weight for maintaining a healthy skin homoeostasis is gaining greater attention. On this background, there is growing evidence of an adverse influence of excess body weight on the immune system, which has a resultant detrimental effect on the functioning of the skin. The presence of obesity appears to intensify various inflammatory skin disorders. These immune-dermatological consequences in the obese occur because of multiple adverse changes in the skin physiology, endocrine imbalance, metabolic deviations, alterations in circulation, skin microbiome and immunological disruptions. The purpose of this article is to highlight the profound impact of increased fat deposition on cutaneous immunology and its role in the pathophysiology of various chronic inflammatory dermatological conditions. Understanding these immunological modulations will aid in developing therapies targeting the specific inflammatory mediators in the management of obesity-associated chronic immunological skin disease.

Eosinophilia and elevated IgE serum levels: a red flag: when your diagnosis is not a common atopic eczema or common allergy

OBJECTIVE AND DESIGN

The hallmark of type 2 inflammation is eosinophilia and/or high IgE serum levels, mostly in atopic dermatitis. Nevertheless, many dermatoses may present similar findings. Our aim is to explore the biological and clinical spectrum of cutaneous manifestations involving tissue and/or systemic eosinophilia, and distinct serum levels of IgE, where atopic dermatitis or other primary allergic eczema, not always is the definitive diagnosis.

MATERIALS/METHODS

A total of 37 scientific papers were enrolled in this narrative review.

RESULTS

A diagnostic approach for patients with elevated serum IgE level and a list of conditions not related to atopic dermatitis that runs through inborn errors of immunity, inflammatory disorders, lung disorders, malignancy, infections/infestations are displayed. Regarding to peripheral eosinophilia, differential diagnosis is also explored and clinical patterns of skin diseases associated with tissue eosinophilia are listed, to facilitate our diagnosis.

CONCLUSIONS

We should maintain a high level of suspicion about other differential diagnosis involving eosinophilia and IgE dysregulation, especially in patients very young (when innate errors of the immunity may present) and in middle to elderly patients classified as having atopic dermatitis, due to the possibility of cutaneous hematological malignancies, paraneoplasia or autoimmune blistering diseases.

The Application of Dupilumab to Pediatric Patients Aged 6-11yrs with Moderate-to-Severe Atopic Dermatitis Whose Disease is Not Adequately Controlled: The Clinical Data so Far

Background

While dupilumab has shown efficacy in improving atopic dermatitis, few studies have assessed the long-term clinical data of dupilumab use in pediatric patients.

Objective

In the present study, we reviewed the current literature to assess reported efficacies, side effects, and risks of using dupilumab to treat atopic dermatitis in pediatric populations.

Methods

Using PRISMA guidelines, the authors searched PubMed/MEDLINE and Embase for studies related to dupilumab treatment for atopic dermatitis in pediatric patients aged 6-11 years old.

Results

A total of 512 pediatric patients (ages 6-11) were included. Outcome measures assessed by EASI, SCORAD, P-NRS, IGA and C-DLQI showed significant improvements in scores from those observed at baseline to the last treatment of dupilumab. Most reported adverse effects on dupilumab were conjunctivitis and infection site reactions. All studies reported that dupilumab was well-tolerated.

Limitations

Limitations include the low number of studies available and observation periods of up to 16 weeks, which may be too short to evaluate the drug's effectiveness and occurrence of adverse effects. This also limits our knowledge on whether there are sustained benefits and/or diminished efficacy as well as long-term side effects.

Conclusion

Thus far, the data demonstrates dupilumab to be safe and effective in the management of moderate-to-severe atopic dermatitis in children aged 6-11 years. Future studies should evaluate long-term dupilumab use and sustained effects.

Beyond skin white spots: Vitiligo and associated comorbidities

Vitiligo is a common depigmentation disorder of an unknown origin characterized by the selective loss of melanocytes, resulting in typical white macules and patches. However, vitiligo is now recognized as more than just a skin disease, what a dermatologist observes as a white spot of skin is just the "tip of the iceberg" of the condition. We attempt to clarify the classification of comorbidities associated with vitiligo from various reviews and reports, and describe their possible pathogenesis. In conclusion, the literature provides evidence of an association between vitiligo and ocular and auditory abnormalities, autoimmune disorders, other dermatological diseases, metabolic syndrome and related disorders, and psychological diseases. These associations highlight the importance of a multidisciplinary approach in managing vitiligo patients.

Metabolic Comorbidities in Pediatric Atopic Dermatitis: A Narrative Review

Atopic dermatitis (AD) is an itchy dermatitis with multifactorial aetiology, chronic-recurrent course, and typical distribution of lesions according to the age, affecting the 10-20% of pediatric population. Patients with AD, including children, suffer from many metabolic comorbidities, including metabolic syndrome, being overweight, obesity, dyslipidaemia, and arterial hypertension, all of which had a prevalence that was demonstrated to be higher than in healthy patients. The association between AD and metabolic comorbidities is multifactorial and involves the deregulation of immune system. In fact, hypertrophic adipose tissue produces soluble adipokines involved in inflammation and immunity, which stimulate the production of pro-inflammatory cytokines, responsible for a chronic low-grade inflammatory state and a higher predisposition to hypersensitivity reactions. Especially in pediatric population with AD, these metabolic disorders are usually underestimated and are associated with long term sequelae and an increased risk of a cardiovascular event, which may also occur later in adult age. Therefore, metabolic comorbidities should be carefully evaluated and early treated in children with AD, to minimize the long-term risk of cardiovascular events.

Genetic/Environmental Contributions and Immune Dysregulation in Children with Atopic Dermatitis

Atopic dermatitis (AD) is one of the most common skin conditions in humans. AD affects up to 20% of children worldwide and results in morbidity for both patients and their caregivers. The basis of AD is an interplay between genetics and the environment characterized by immune dysregulation. A myriad of mutations that compromise the skin barrier and/or immune function have been linked to AD. Of these, filaggrin gene (FLG) mutations are the most evidenced. Many other mutations have been implicated in isolated studies that are often unreplicated, creating an archive of genes with potential but unconfirmed relevance to AD. Harnessing big data, polygenic risk scores (PRSs) and genome-wide association studies (GWAS) may provide a more practical strategy for identifying the genetic signatures of AD. Epigenetics may also play a role. Staphylococcus aureus is the most evidenced microbial contributor to AD. Cutaneous dysbiosis may result in over-colonization by pathogenic strains and aberrant skin immunity and inflammation. Aeroallergens, air pollution, and climate are other key environmental contributors to AD. The right climate and/or commensals may improve AD for some patients.

No Association Between First Exposure to General Anaesthesia and Atopic Dermatitis in the Paediatric Population

General anaesthesia could affect various immune responses, including Th1 and Th2 immunity, which might also affect cells that play an important role in the pathogenesis of atopic dermatitis. However, the relationship between general anaesthesia exposure and atopic dermatitis remains unknown. The aim of this study was to investigate the risk of developing atopic dermatitis after first exposure to general anaesthesia in the paediatric population (18 years or under). A retrospective cohort study, including those exposed (n = 7,681) and unexposed (n = 38,405; control participants) to general anaesthesia (1:5 ratio), was conducted using national sample cohort data from 2002 to 2015. All participants were followed up for 2 years after cohort entry. The 2-year cumulative incidences of atopic dermatitis in the exposed and unexposed groups were 2.3% and 2.2%, respectively. In the subgroup analysis by age, the cumulative incidence was not significantly different between these cohorts. The risks of atopic dermatitis were not significant in the exposed group in the univariate model (hazard ratio 1.05; confidence interval 0.88-1.24) and in the multivariate model, wherein all covariates were adjusted (adjusted hazard ratio, 1.03; 95% confidence interval 0.87-1.23). The results suggest that children's exposure to general anaesthesia was not associated with increased or decreased risk of atopic dermatitis.

Delayed medical care due to transportation barriers among US children with atopic dermatitis

Our objective was to examine the prevalence and predictors of delayed medical care due to transportation barriers among children with atopic dermatitis (AD) living in the United States (US). We analyzed data from the 1998-2018 National Health Interview Survey, a nationally representative survey of US households. In 2018, transport-delayed care was reported for 3.4% of US children with AD, representing approximately 279,000 children annually given the National Health Interview Survey's weighted survey design, and was more common among patients of lower socioeconomic status. Targeted interventions aimed at reducing transportation barriers to healthcare among at-risk AD patients may reduce health disparities related to AD.

Microglia activation in the mPFC mediates anxiety-like behaviors caused by Staphylococcus aureus strain USA300

INTRODUCTION

Staphylococcus aureus (S. aureus) is considered as one of the major causative agents of serious hospital- and community-acquired infections. Recent studies have reported that S. aureus infection induced neuroinflammation and was linked with some mental disorders. To evaluate the effects of S. aureus infection on abnormal behaviors, we conducted the present study.

METHODS

A S. aureus USA300-infected mouse model was established using bacterial suspension injection into tail vein. A series of behavioral tests were performed after USA300 infection. The expression of cytokines was detected in serum and mPFC. The number and some morphological parameters of microglia were also evaluated by immunofluorescence staining.

RESULTS

Anxiety-like behaviors, instead of locomotor activity impairment or depression-like behaviors, were observed in mice infected with S. aureus USA300 compared with control. S. aureus USA300 infection caused overexpression of IL-6, TNF-α, and IL-1β in serum, resulted in microglial over-activation and excessive release of proinflammatory cytokines in the mPFC. In addition, overexpression of TLR2 accompanied by increased GLS1 and p-STAT3 was observed in the mPFC of mice infected with S. aureus USA300.

CONCLUSION

This study provides evidence that S. aureus USA300 infection can lead to neuroinflammation in the mPFC of mice, which may contribute to the development of anxiety.

Longitudinal association of atopic dermatitis progression and keratin 6A

Atopic dermatitis is a common skin disease characterized by loss of skin integrity. Risk and severity have been associated with genetic variation especially with respect to the filaggrin gene, suggesting the importance of skin barrier function in atopic dermatitis pathogenesis. The keratin protein plays a role in epithelial health but its relationship with disease severity would benefit from further exploration. In this study, we evaluate the association between common keratin 6 variants and severity of atopic dermatitis over time using a Bayesian generalized linear mixed model to account for repeated measures. We identify groups of variants within which individual variants have similar effects on skin repair. Further assessment of the biological mechanisms by which these contribute to repair of epidermis may inform treatment of atopic dermatitis.

Lymph-derived chemokines direct early neutrophil infiltration in the lymph nodes upon Staphylococcus aureus skin infection

A large number of neutrophils infiltrate the lymph node (LN) within 4 h after Staphylococcus aureus skin infection (4 h postinfection [hpi]) and prevent systemic S. aureus dissemination. It is not clear how infection in the skin can remotely and effectively recruit neutrophils to the LN. Here, we found that lymphatic vessel occlusion substantially reduced neutrophil recruitment to the LN. Lymphatic vessels effectively transported bacteria and proinflammatory chemokines (i.e., Chemokine [C-X-C motif] motif 1 [CXCL1] and CXCL2) to the LN. However, in the absence of lymph flow, S. aureus alone in the LN was insufficient to recruit neutrophils to the LN at 4 hpi. Instead, lymph flow facilitated the earliest neutrophil recruitment to the LN by delivering chemokines (i.e., CXCL1, CXCL2) from the site of infection. Lymphatic dysfunction is often found during inflammation. During oxazolone (OX)-induced skin inflammation, CXCL1/2 in the LN was reduced after infection. The interrupted LN conduits further disrupted the flow of lymph and impeded its communication with high endothelial venules (HEVs), resulting in impaired neutrophil migration. The impaired neutrophil interaction with bacteria contributed to persistent infection in the LN. Our studies showed that both the flow of lymph from lymphatic vessels to the LN and the distribution of lymph in the LN are critical to ensure optimal neutrophil migration and timely innate immune protection in S. aureus infection.

Obesity-Mediated Immune Modulation: One Step Forward, (Th)2 Steps Back

Over the past decades, the relationship between the immune system and metabolism has become a major research focus. In this arena of immunometabolism the capacity of adipose tissue to secrete immunomodulatory molecules, including adipokines, within the underlying low-grade inflammation during obesity brought attention to the impact obesity has on the immune system. Adipokines, such as leptin and adiponectin, influence T cell differentiation into different T helper subsets and their activation during immune responses. Furthermore, within the cellular milieu of adipose tissue nutrient availability regulates differentiation and activation of T cells and changes in cellular metabolic pathways. Upon activation, T cells shift from oxidative phosphorylation to oxidative glycolysis, while the differential signaling of the kinase mammalian target of rapamycin (mTOR) and the nuclear receptor PPARγ, amongst others, drive the subsequent T cell differentiation. While the mechanisms leading to a shift from the typical type 2-dominated milieu in lean people to a Th1-biased pro-inflammatory environment during obesity are the subject of extensive research, insights on its impact on peripheral Th2-dominated immune responses become more evident. In this review, we will summarize recent findings of how Th2 cells are metabolically regulated during obesity and malnutrition, and how these states affect local and systemic Th2-biased immune responses.

Dupilumab Provides Rapid and Sustained Improvement in SCORing Atopic Dermatitis Outcomes in Paediatric Patients with Atopic Dermatitis

This post hoc analysis examined SCORing Atopic Dermatitis (SCORAD) outcomes in 471 paediatric patients (children age 6–<12 years, n = 304; adolescents age 12–<18 years, n = 167) with atopic dermatitis treated with dupilumab, ± topical corticosteroids, in two 16-week phase 3 randomized controlled trials and a 1-year interim data cut of a subsequent open-label extension study. Paediatric patients treated with dupilumab (± topical corticosteroids) had significantly lower SCORAD, objective SCORAD (o-SCORAD), and individual SCORAD components from week 3 to 16 compared with placebo (± topical corticosteroids) in the randomized controlled trials. The results were sustained or continuously improved over 1 year of open-label treatment with dupilumab ± topical corticosteroids. SCORAD-50 was achieved in almost all patients (91.3–91.8%) by week 52 with continued dupilumab treatment across age groups. Almost all (> 86%) patients achieved mild or absent pruritus and sleep loss at week 52. In conclusion, dupilumab ± topical corticosteroids resulted in rapid and significant improvements in all aspects of SCORAD analysed, and the results were sustained over 1 year.

Two meta-analyses of the association between atopic diseases and core symptoms of attention deficit hyperactivity disorder

Studies in the field of neuroscience and psychology have hypothesized that a causal association exists between atopic diseases and attention-deficit/hyperactivity disorder (ADHD). Previous systematic reviews and meta-analyses have reported a higher risk of ADHD in children with atopic diseases; however, the relationship between ADHD symptoms and atopic diseases remains unclear. We systematically reviewed observational cross-sectional and longitudinal studies to investigate the relationship between atopic diseases and ADHD symptom severity (hyperactivity/impulsivity and inattention). The majority of studies showed a statistically significant association between atopic diseases and both ADHD symptoms, with substantial heterogeneity in the outcome of hyperactivity/impulsivity. Remarkably decreased heterogeneity and statistical significance were observed in the second meta-analysis of ADHD-related behavior symptoms in atopic patients without ADHD. Our study indicated that atopic diseases not only associated with ADHD but also ADHD symptoms severity. This association was even observed in children with subthreshold ADHD, indicating that atopic diseases may play a role in the spectrum of ADHD symptom severity. Trial registration: This study was registered on PROSPERO (registration ID: CRD42020213219).

Atopic Dermatitis: The Fate of the Fat

Atopic dermatitis (AD) is a chronic and relapsing inflammatory skin disease in which dry and itchy skin may develop into skin lesions. AD has a strong genetic component, as children from parents with AD have a two-fold increased chance of developing the disease. Genetic risk loci and epigenetic modifications reported in AD mainly locate to genes involved in the immune response and epidermal barrier function. However, AD pathogenesis cannot be fully explained by (epi)genetic factors since environmental triggers such as stress, pollution, microbiota, climate, and allergens also play a crucial role. Alterations of the epidermal barrier in AD, observed at all stages of the disease and which precede the development of overt skin inflammation, manifest as: dry skin; epidermal ultrastructural abnormalities, notably anomalies of the lamellar body cargo system; and abnormal epidermal lipid composition, including shorter fatty acid moieties in several lipid classes, such as ceramides and free fatty acids. Thus, a compelling question is whether AD is primarily a lipid disorder evolving into a chronic inflammatory disease due to genetic susceptibility loci in immunogenic genes. In this review, we focus on lipid abnormalities observed in the epidermis and blood of AD patients and evaluate their primary role in eliciting an inflammatory response.

Emerging Roles of Adipose Tissue in the Pathogenesis of Psoriasis and Atopic Dermatitis in Obesity

Obesity is a growing epidemic worldwide, and it is also considered a major environmental factor contributing to the pathogenesis of inflammatory skin diseases, including psoriasis (PSO) and atopic dermatitis (AD). Moreover, obesity worsens the course and impairs the treatment response of these inflammatory skin diseases. Emerging evidence highlights that hypertrophied adipocytes and infiltrated immune cells secrete a variety of molecules, including fatty acids and adipokines, such as leptin, adiponectin, and a panel of cytokines/chemokines that modulate our immune system. In this review, we describe how adipose hypertrophy leads to a chronic low-grade inflammatory state in obesity and how obesity-related inflammatory factors are involved in the pathogenesis of PSO and/or AD. Finally, we discuss the potential role of antimicrobial peptides, mechanical stress and impairment of epidermal barrier function mediated by fast expansion, and dermal fat in modulating skin inflammation. Together, this review summarizes the current literature on how obesity is associated with the pathogenesis of PSO and AD, highlighting the potentially important but overlooked immunomodulatory role of adipose tissue in the skin.

"His first word was 'cream'." The burden of treatment in pediatric atopic dermatitis-A mixed methods study

The burden of treatment (BOT) is the workload of health care experienced by patients with chronic conditions and consequences on well-being. This study aimed to assess the BOT of atopic dermatitis (AD) on children and caregivers using mixed methods. The quantitative component of this mixed methods study involved the Treatment Burden Questionnaire. The qualitative component involved interviews with parents of children with moderate-severe AD. The questionnaire was completed by 168 parents; 32.1% had mild AD, 39.9% had moderate AD, and 28% had severe AD. The average burden score was 3.5 (out of 10). Average burden scores were low in mild AD (1.0 out of 10) and were proportionally higher in moderate (3.9 out of 10) and severe (5.8 out of 10) AD (p < 0.001). Increased frequency of therapy had increased perceived burden. In moderate-severe AD, oral therapy was rated as less burdensome than topical therapies. Semi-structured interviews were conducted with 15 parents of children with moderate-severe AD. Thematic analysis grouped experiences into health care burden, treatment burden, and financial burden. Insights from health care burden analysis included "mixed messages," "treatment futility," and "expectant resolution." Insights from treatment burden included treatment routine, schooling impact, and "topical-sparing" with systemic treatment. Factors of financial burden included topical treatments, clothing, and health care visits. Moderate-severe AD is associated with high BOT, particularly related to topical therapies, which may be reduced by systemic treatment. All physicians treating children with AD should avoid potentially damaging communication regarding mixed messages, treatment futility, and expectant resolution.

Real-world comorbidities of atopic dermatitis in the U.S. adult ambulatory population

BACKGROUND

Atopic dermatitis (AD) is a pruritic inflammatory skin disease associated with various comorbidities. However, comprehensive analyses of real-world comorbidities in adult AD patients are limited.

OBJECTIVE

To characterize the real-world comorbidities associated with adult AD in an ambulatory population.

METHODS

We queried the MarketScan Commercial Claims and Encounters database from January 1, 2017 to December 31, 2017. Multivariable logistic regressions were performed to compare comorbidities in adult AD patients vs. age- and sex-matched controls.

RESULTS

A total of 39,779 AD patients and 353,743 controls were identified. Increased odds of psychiatric conditions including anxiety (OR 1.44) and mood disorders (OR 1.31) were observed in AD. AD patients had higher likelihood of autoimmune diseases including vitiligo (OR 4.44) and alopecia areata (OR 6.01). Adult AD was also associated with infections including impetigo (OR 9.72), MRSA (OR 3.92), and cellulitis (OR 2.52). AD patients were more likely to have systemic conditions including lymphoid/hematopoietic malignancy (OR 1.91), atherosclerosis (OR 1.69), and metabolic syndrome (OR 1.47). For all the above, p<0.001.

LIMITATIONS

Retrospective analysis of healthcare claims data CONCLUSIONS: Adult AD is associated with various psychiatric and systemic comorbidities, emphasizing the systemic nature of AD and the need for collaborative management of these patients.

Generation and Validation of the PROMIS Itch Questionnaire - Child to Measure the Impact of Itch on Life Quality

Itch compromises quality of life, but most itch assessments focus only on itch intensity. We aimed to develop and validate a comprehensive PROMIS (Patient Reported Outcomes Measurement Information System®) pediatric measure for itch symptoms and itch impact, defined as the effect specifically of itch on physical, mental, and social health, all of which can affect life quality. After literature review, concept elicitation and cognitive interviews with parents and children with itch, and repeated content-expert review, an item pool was generated and refined. The pool was calibrated with data from 499 pruritic children using exploratory and confirmatory factor analyses, item response theory, and item fit analysis. The resultant 45-item bank, PROMIS Itch Questionnaire - Child (PIQ-C), showed good convergent and discriminant validity in 181 children 8-17 years of age, discriminating children with different levels of severity, and was responsive to change. Strong correlations (rho>.60) were observed with pain and sleep measures, and moderate correlations with other pediatric PROMIS measures. PIQ-C comprehensively measures itch intensity and burden, providing an itch-specific alternative for assessing life quality. The independent calibration of each item/question allows for flexibility in generating short-forms or computerized adaptive testing for efficient use in research and office practice.

Contribution of Antigen-Processing Machinery Genetic Polymorphisms to Atopic Dermatitis

Atopic dermatitis (AD) is a chronic and recurrent inflammatory dermatosis. We recently described an association of the C allele of the single nucleotide polymorphism (SNP) rs26618 in the ERAP1 gene and a synergism of ERAP1 and ERAP2 effects on AD risk. Here, we examined whether polymorphisms of other antigen-presenting machinery genes encoding immunoproteasome components LMP2 and LMP7 and peptide transporter components TAP1 and TAP2 may also affect susceptibility to AD or its outcome. We found that the LMP7 rs2071543*T allele decreased disease risk by about 1.5-fold (odds ratio 0.66, 95% confidence interval 0.44–0.99). On the other hand, the LMP2 rs1351383*C allele reduced the mean age at diagnosis from 23 to 15 years (p < 0.001). Similarly, the TAP1 rs1135216*C allele decreased the mean age at diagnosis from almost 20 to 14 years (p = 0.033). The results are discussed in light of other reports on the role of these polymorphisms in human disease.

Skin and obesity in childhood: an update

<abstract> <p>Overweight and obesity have grown in children in the last decades and are now an epidemic, leading to significant public health issues in developed and underdeveloped nations. Obese children have a higher prevalence of skin lesions than normal weight children. The present study is an updated-on state of the art of studies describing the association between childhood obesity and related skin lesions. The most frequent obesity-associated dermatological complications in children are acanthosis nigricans and acrochordons, atopic dermatitis, skin infections, and endocrinological changes including hyperinsulinism and hyperandrogenism. Other common skin manifestations associated with obesity are striae distensae and plantar hyperkeratosis. Although the causes of the majority of the skin lesions associated with obesity are not known, the larger mass of adipose tissue and the secretion of peptides (cytokines, hormones, etc.) from enlarged fat cells due to obesity could lead to skin lesions. Therefore, the prevention of obesity is essential to avoid most skin-associated lesions.</p> </abstract>