Contact Dermatitis Research Articles

The decrease in peripheral blood basophils in a mouse model of IgE-induced inflammation involves their migration to lymph nodes

BackgroundDuring the active phase of urticaria, a decrease in peripheral blood basophils, known as basopenia, is observed. We previously reported that basopenia occurs as a result of basophils migrating to the skin in a contact dermatitis model where a Th2 response is induced with oxazolone. ObjectiveAlthough there is currently no established model for urticaria, given that urticaria is an IgE-mediated immediate-type allergic reaction, we aimed to determine whether an IgE-mediated model could reproduce the decrease in basophils in peripheral blood observed during the active phase of urticaria. MethodsMice were pretreated with 2,4,6-trinitrophenylhaptene (TNP)-specific IgE and basophil dynamics were examined following stimulation with TNP-ovalbumin. Mast cell-deficient WBB6F1-KitW/KitW-v mice were used to investigate the role of mast cells in this IgE-mediated model. ResultsFollowing stimulation, we observed immediate ear swelling and basopenia after 0.5 hours. However, the number of basophils observed in the skin lesions was low, while a higher number of basophils were observed in the antigen-draining lymph nodes (LN). In mast cell-deficient mice, no increase in basophils in the LN was observed, reflecting reduced antigen influx into the LN, but basophils remained in the skin. ConclusionsIn the IgE-mediated mouse model, basopenia was observed, which coincided with the induction of inflammation in the skin. The migration of basophils to the LN in this model suggests that the systemic immune system, including the LN, should be considered when exploring the pathogenesis of urticaria in humans.

54015 Prosthesis contact dermatitis with long-term prosthetic lining usage

54015 Prosthesis contact dermatitis with long-term prosthetic lining usage

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

54418 Uncovering a Hidden Threat: Propylene Glycol as an Underrecognized Allergen and Cause of Allergic Contact Dermatitis

54418 Uncovering a Hidden Threat: Propylene Glycol as an Underrecognized Allergen and Cause of Allergic Contact Dermatitis

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

Supplement: 16th Congress of the European Society of Contact Dermatitis (ESCD), 4-7 September 2024, Dresden, Germany.

P15-11 Comparison between senescence-accelerated mice and usual aging mice in development of Dermatophagoides farinae-induced asthma and hapten-induced allergic contact dermatitis

P15-11 Comparison between senescence-accelerated mice and usual aging mice in development of Dermatophagoides farinae-induced asthma and hapten-induced allergic contact dermatitis

Dermatitis among Workers and Its Relation with Personal Protective Equipment

Introduction: Every workplace must make an occupational health effort to avoid health problems. Many workers underestimate the risks of the job and, therefore, do not use safety equipment even when available. The most often reported case of occupational skin illnesses, contact dermatitis, accounts for more than 85% of all cases. This study was conducted to occupational dermatitis and its relationship to personal protective equipment (PPE) use. Methods: The literature search was carried out in April 2021. The research sources were taken from several databases with the keywords dermatitis, occupational health, and personal protective equipment. The Google Scholar database found 17,710 articles, ScienceDirect found 1,264 articles, ProQuest found 888 articles, and PubMed found 452 articles. Of the entire database, only 36 articles met the inclusion criteria. Results: This literature review shows that dermatitis is experienced by workers in various sectors including health workers, hairdressers, scavengers, farmers, fishermen, manufacturing industry workers, printing workers, and construction workers. The use of PPE can reduce the risk of dermatitis. However, in some conditions, the use of PPE has no effect or can even cause dermatitis due to irritation and allergies to the ingredients contained in the PPE. The limitation of this research is that the articles that are the source of this review are only from 2016–2021.Conclusion: Dermatitis still occurs in various occupational sectors. The risk of dermatitis can be decreased by using PPE; however, it can also cause the occurrence of dermatitis itself.

Defining cell type-specific immune responses in a mouse model of allergic contact dermatitis by single-cell transcriptomics.

Allergic contact dermatitis (ACD), a prevalent inflammatory skin disease, is elicited upon repeated skin contact with protein-reactive chemicals through a complex and poorly characterized cellular network between immune cells and skin resident cells. Here, single-cell transcriptomic analysis of the murine hapten-elicited model of ACD reveals that upon elicitation of ACD, infiltrated CD4+ or CD8+ lymphocytes were primarily the IFNγ-producing type 1 central memory phenotype. In contrast, type 2 cytokines (IL4 and IL13) were dominantly expressed by basophils, IL17A was primarily expressed by δγ T cells, and IL1β was identified as the primary cytokine expressed by activated neutrophils/monocytes and macrophages. Furthermore, analysis of skin resident cells identified a sub-cluster of dermal fibroblasts with preadipocyte signature as a prominent target for IFNγ+ lymphocytes and dermal source for key T cell chemokines CXCL9/10. IFNγ treatment shifted dermal fibroblasts from collagen-producing to CXCL9/10-producing, which promoted T cell polarization toward the type-1 phenotype through a CXCR3-dependent mechanism. Furthermore, targeted deletion of Ifngr1 in dermal fibroblasts in mice reduced Cxcl9/10 expression, dermal infiltration of CD8+ T cell, and alleviated ACD inflammation in mice. Finally, we showed that IFNγ+ CD8+ T cells and CXCL10-producing dermal fibroblasts co-enriched in the dermis of human ACD skin. Together, our results define the cell type-specific immune responses in ACD, and recognize an indispensable role of dermal fibroblasts in shaping the development of type-1 skin inflammation through the IFNGR-CXCR3 signaling circuit during ACD pathogenesis.

Defining cell type-specific immune responses in a mouse model of allergic contact dermatitis by single-cell transcriptomics

Defining cell type-specific immune responses in a mouse model of allergic contact dermatitis by single-cell transcriptomics

Ferrostatin-1 alleviates skin inflammation and inhibits ferroptosis of neutrophils and CD8+ T cells in allergic contact dermatitis

BackgroundFerroptosis is considered as an immunogenic type of regulated cell death and associated with the pathogenesis of inflammatory skin diseases. However, the involvement and function of ferroptosis in allergic contact dermatitis (ACD) remains unknown. ObjectiveTo explore the role of ferroptosis in ACD. To reveal which type of cells develops ferroptosis in ACD. MethodsWe detected the key markers of ferroptosis in 1-Chloro-2,4-dinitrochlorobenzene (DNCB)-induced ACD mice model. We applicated ferrostatin-1 (Fer-1) to restrain ferroptosis in ACD mice and then compared the severity of dermatitis and the level of inflammation and ferroptosis in dermis and epidermis, respectively. Keratinocyte-specific Gpx4 conditional knockout (cKO) mice were used to investigate the function of keratinocyte ferroptosis in the development of ACD. Single-cell RNA sequencing was conducted to analyze the affection of Fer-1 on different type of cells in ACD. ResultsFerroptosis was involved in DNCB-induced ACD mice. Ferroptosis activation was more remarkable in dermis rather than in epidermis. Gpx4 cKO mice showed similar severity of skin dermatitis as control mice. Fer-1 alleviated skin inflammation in mice and reduced ferroptosis in neutrophils and CD8+ T cells both of which contribute to development of ACD. ConclusionFerroptosis was activated in immune cells, especially neutrophils and CD8+ T cells in DNCB-induced ACD mice. Fer-1 treatment inhibited ferroptosis of neutrophils and CD8+ T cells and relieved skin damage in ACD mice.

Crisaborole combined with vitamin D demonstrates superior therapeutic efficacy over either monotherapy in mice with allergic contact dermatitis

This study evaluated the therapeutic efficacy and underlying mechanisms of crisaborole combined with vitamin D in the treatment of allergic contact dermatitis. While crisaborole, a phosphodiesterase 4 inhibitor, and vitamin D analogs are commonly used in the treatment of atopic dermatitis, their combined therapeutic potential in allergic contact dermatitis (ACD) remains unexplored. Given their anti-inflammatory properties, we hypothesized that the combination of crisaborole and vitamin D could offer superior efficacy in mitigating the symptoms and underlying mechanisms of allergic contact dermatitis. In vitro, HaCaT cells stimulated with tumor necrosis factor-α and interferon-γ were treated with a combination of crisaborole and vitamin D, followed by cytokine expression analysis. In vivo, male C57BL/6 mice were divided into five groups and treated accordingly: blank control, dinitrochlorobenzene-induced model, crisaborole alone, vitamin D alone, and a combination of crisaborole and vitamin D. On day 14, dorsal skin and ear thickness were measured, followed by comprehensive pathological evaluations. In vivo and in vitro experiments showed that the expression levels of inflammatory factors were significantly lower in the DNCB + VD + Cri group than in the DNCB group. Histological analyses revealed that, compared with the DNCB group, the combined treatment group significantly reduced epidermal hyperkeratosis, improved epidermal transdermal water loss, decreased dermatitis scores, and diminished mast cell infiltration. Moreover, it lowered the expression levels of IL-6, IL-4, TNF-α, iNOS, IL-17, CC chemokine ligand 2 (CCL2), and CC chemokine receptor 2 (CCR2). CCL2 recognizes CCR2 and stimulates inflammatory cells, enhancing the inflammatory response. Increased CCL2 expression correlates with heightened inflammation and dendritic cell infiltration in ACD, while downregulation of CCL2 attenuates inflammation. Thus, the combined use of crisaborole and vitamin D demonstrates superior therapeutic efficacy over monotherapy in a mouse model of ACD. The combination of vitamin D and crisaborole significantly reduces inflammation and epidermal hyperkeratosis in a mouse model of allergic contact dermatitis, demonstrating superior therapeutic efficacy compared to either treatment alone. This suggests that the combined therapy could be a promising approach for the prevention and treatment of allergic contact dermatitis.

Probing skin photoallergens in reconstructed human epidermis: An EPR spin trapping investigation.

Photoallergic contact dermatitis is a skin disease caused by combined exposure to photoreactive chemicals and sunlight. Exposure to allergens and the risk of skin sensitization is an essential regulatory issue within the industry. Yet, only few non-validated assays for photoallergy assessment exist as the pathogenesis is not fully deciphered. Improving such assays and/or developing new ones require an understanding of the chemical mechanisms involved. The first key event in the photosensitization process, namely chemical binding of the photoallergen to endogenous proteins, is thought to proceed via photo-mediated radicals arising from the photoallergen. Moreover, the mechanism of action of these radicals if formed in the epidermis is not known and far from being unraveled. We present here an original proof-of-concept methodology to probe radical generation from allergens in contact with photoexposed skin, using electron paramagnetic resonance and spin trapping in a reconstructed human epidermis model mimicking real-life exposure scenarios.

Skin Adhesive Tapes: An Effective Wound Closure Method for Percutaneous Vertebral Body Stenting.

Background Skin adhesive tapes (SATs) are hypoallergenic adhesive tapes commonly used for wound closure in percutaneous vertebroplasty (PVP). Vertebral body stenting (VBS) is a metallic balloon-expandable stent used to treat vertebral body fractures. Its balloon and stent deployment involves a larger stab incision and pedicle bore tract than PVP, increasing the risk of bleeding and wound complications. This study evaluated the outcome and complications of VBS wound closure with SAT and the reasons for conversion to conventional suture closure (SC). Material and methods A retrospective series of patients who underwent VBS from May 2019 to March 2021 were identified from review of computerized medical records. Data were collected for wound closure method, reason for SC, number of operative levels, postoperative wound complications of contact dermatitis, tension blisters, tape dislodgement, surgical site infection, wound dehiscence, symptomatic hematoma and return to operating theater. The wounds were assessed for complete healing and cosmesis at outpatient follow-up visits. Results A total of 36 patients were identified. SAT closure was performed in 33 (91.6%) patients, while SC was performed in three (8.3%) patients. Unplanned conversion to SC was required in two (5.5%) patients due to continued intraoperative wound bleeding, while one (2.7%) patient had planned SC as part of a staged operation. Uneventful closures occurred in 32 (97.0%) of SAT closures. One (3%) SAT closure patient developed postoperative blood-soaked dressings and tape dislodgement, requiring reapplication of the SATs at the ward with uneventful recovery thereafter. No patient with SAT closure developed contact dermatitis, tension blisters, surgical site infection, wound dehiscence, symptomatic hematoma, or required return to theater. All SAT closure patients had complete wound healing at outpatient follow-up at six weeks. No SAT closure was found to be cosmetically unacceptable or required wound revision for any reason at up to one year postoperatively. Conclusion SATs are a safe and reliable means of wound closure for VBS. Conversion to SC due to continued intraoperative wound site bleeding is rarely required.

Dermatovenereology in the Russian Federation: results of 2023

The article presents information on dynamics of dermatovenerological service resources, indicators of the population of the Russian Federation provision with dermatovenerologists and dermatovenerological beds, main performance rates and results of dermatovenereological medical care providing in outpatient, inpatient and day hospital conditions for the period 2019–2023. The dynamics of sexually transmitted infections (syphilis, gonococcal infection, trichomoniasis, chlamydial infection, anogenital herpetic viral infection and anogenital venereal warts) incidence in the Russian Federation, as well as contribution of foreign citizens to the syphilis incidence rates are analyzed. The dynamics of prevalence and incidence rates of diseases of the skin and subcutaneous tissue in the Russian Federation in 2019–2023, as well as dynamics of prevalence and incidence of atopic dermatitis, psoriasis, contact dermatitis, localized scleroderma, discoid lupus erythematosus among children aged 0–17 years and adults 18 years and older are presented.

Hand eczema in Italian patients referred for patch testing: A retrospective SIDAPA study (2016-2023).

Hand eczema (HE) is a common skin disease with a negative impact on patients' quality of life in occupational and non-occupational settings. Up-to-date, data on HE in Italian patients referred for patch testing are lacking. To characterise the profile in terms of demographics, aetiology and patch test results of Italian patients affected by HE referred for patch testing. A retrospective descriptive study on consecutive patients affected by HE who underwent patch testing from 2016 to 2023 in eight dermatology clinics was performed. HE patients were divided into two groups according to the exclusive (HE-only group) and not-exclusive (HE+ group) hand involvement, and compared to patients with eczema localised in body areas other than hands (NHE group). One thousand five hundred and ninety-seven patients were affected by HE (35.3% males; mean age 42.7 years), 60.2% belonging to the HE-only group and 39.8% to the HE+ group. Occupational dermatitis was diagnosed in 33.2% of HE-only patients, 25.0% of HE+ patients and 5.2% of NHE patients (p < 0.001). HE-only patients presented: Allergic Contact Dermatitis (ACD), Irritant Contact Dermatitis (ICD), atopic HE in 48.1%, 47.5% and 7.1%, respectively; hyperkeratotic palmar, acute recurrent vesicular and nummular clinical subtypes in 52.2%, 43.9% and 11.9%, respectively; relevant positive patch test reactions in 48.1% (nickel sulphate 18.9%, methylchloroisothiazolinone/methylisothiazolinone 10.6%, methylisothiazolinone 8.6%, p-phenylenediamine 6.0% and potassium dichromate 4.7%). HE patients, and particularly those with exclusive hand involvement, show a particular profile in terms of demographic and clinical characteristics, etiologies and relevant positive patch test reactions.

A practical guide to recognize allergic and immunologic skin diseases: diagnosis at first sight

Allergic and immunologic skin diseases are becoming increasingly common and this requires clinicians to be able to recognize and diagnose them. A joint meeting (GET TOGETHER 2022) of the Italian Society of Allergy, Asthma and Clinical Immunology (SIAAIC) and the Italian Society of Allergological, Occupational and Environmental Dermatology (SIDAPA) aimed to review the current knowledge on the differential diagnosis of contact dermatitis, atopic dermatitis, hereditary angioedema, urticaria, and cutaneous mastocytosis. The most important aspects to take into consideration when faced with a new cutaneous manifestation are the clinical features of the lesions, their distribution, age of onset, and comorbidities/aggravating factors. The document does not aim to provide an exhaustive and comprehensive description of all allergic and immunologic skin diseases. Instead, it should be a reference tool for the clinician who is faced with the onset of a new skin manifestation and its differential diagnosis.