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- Essai clinique NCT07573735
Assessment of cfDNA-STING Axis as a Potential Pathological Marker in Atopic Dermatitis
An Observational Study on the Correlation Between Circulating Cell-free DNA and Skin Macrophage STING Pathway Activation in Patients With Atopic Dermatitis
Study Overview Atopic dermatitis (AD), commonly known as eczema, is a chronic inflammatory skin condition characterized by intense itching and skin barrier damage. While researchers know that the immune system is overactive in AD, it is difficult to measure the exact level of "damage" or "inflammation" happening deep within the skin using only a physical exam.
The Purpose of This Study This study investigates a specific "danger signal" called circulating cell-free DNA (cfDNA). When skin cells are damaged or die due to inflammation, they release tiny fragments of DNA into the bloodstream. The investigators believe these fragments might act as a trigger for the immune system, worsening the disease.
What the Study Involves Researchers will collect blood samples and small skin biopsies from patients with AD and healthy volunteers.
The study aims to: Compare the levels of cfDNA in the blood of AD patients versus healthy individuals. Determine if higher levels of cfDNA correlate with more severe skin symptoms (measured by scores like SCORAD and EASI). Examine how immune cells in the skin (macrophages) respond to these DNA fragments through a specific biological switch called the STING pathway.
Potential Impact By understanding this "damage-signal" loop, this research may lead to new ways for doctors to monitor AD severity through simple blood tests and could identify new targets for future anti-inflammatory treatments.
Aperçu de l'étude
Statut
Les conditions
Intervention / Traitement
Description détaillée
Scientific Rationale AD is primarily driven by Type 2 (Th2) immune responses; however, the role of innate immune sensing of damage-associated molecular patterns (DAMPs) in maintaining chronic inflammation is less defined. Cell-free DNA (cfDNA) has emerged as a potent DAMP in various autoimmune conditions. This study explores the hypothesis that cfDNA released during epidermal injury and inflammatory cell turnover in AD serves as a ligand for the cyclic GMP-AMP synthase (cGAS) - Stimulator of Interferon Genes (STING) pathway within the skin microenvironment.
Study Objectives Quantification of Systemic DAMPs: To quantify plasma cfDNA concentrations in a cohort of AD patients (n=40) compared to age- and sex-matched healthy controls (n=40) using fluorometric assays. Tissue-Level Mechanism: To characterize the local immune landscape via immunofluorescence (IF) staining of skin biopsies. The study focuses on the infiltration density of CD68+ macrophages and the expression/co-localization of STING protein within these cells.
Methodology Clinical Assessment: Patients undergo standardized dermatological evaluation to determine disease severity. Bio-sampling: Peripheral blood is collected for baseline hematology and cfDNA isolation. For a subset of patients, 4mm punch biopsies are taken from active lesional skin. Data Analysis: Cross-sectional analysis will be used to determine the diagnostic value of cfDNA and its ability to stratify disease severity (Moderate vs. Severe AD). Immunohistochemical quantification will be used to verify the activation of the STING pathway in situ.
Type d'étude
Inscription (Estimé)
Contacts et emplacements
Lieux d'étude
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Jiangsu
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Nanjing, Jiangsu, Chine
- Recrutement
- Zhongda Hospital, Southeast University
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Contact:
- meihong Da
- Numéro de téléphone: 025-83272015
- E-mail: huyk1997@163.com
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
- Adulte
- Adulte plus âgé
Accepte les volontaires sains
Méthode d'échantillonnage
Population étudiée
La description
Inclusion Criteria:
- Age 18 years or older
- Confirmed diagnosis of Atopic Dermatitis
Exclusion Criteria:
- Use of systemic immunosuppressants, systemic corticosteroids, or biological agents within 4 weeks prior to enrollment
- Use of topical treatments within 2 weeks prior to enrollment
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
Cohortes et interventions
Groupe / Cohorte |
Intervention / Traitement |
|---|---|
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AD
This group consists of patients diagnosed with Atopic Dermatitis (AD) according to the Hanifin and Rajka criteria or the Williams diagnostic criteria.
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One-time peripheral venous blood collection and/or 4mm punch biopsy for biomarker analysis.
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Control
This group consists of healthy volunteers with no personal or family history of atopic dermatitis, asthma, allergic rhinitis, or other systemic inflammatory and autoimmune diseases.
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One-time peripheral venous blood collection and/or 4mm punch biopsy for biomarker analysis.
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Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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cfDNA
Délai: enrollment
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the quantification of circulating cell-free DNA
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enrollment
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Collaborateurs et enquêteurs
Parrainer
Publications et liens utiles
Publications générales
- Dong L, Hou YR, Xu N, Gao XQ, Sun Z, Yang QK, Wang LN. Cyclic GMP-AMP synthase recognizes the physical features of DNA. Acta Pharmacol Sin. 2025 Feb;46(2):264-270. doi: 10.1038/s41401-024-01369-7. Epub 2024 Aug 7.
- Decout A, Katz JD, Venkatraman S, Ablasser A. The cGAS-STING pathway as a therapeutic target in inflammatory diseases. Nat Rev Immunol. 2021 Sep;21(9):548-569. doi: 10.1038/s41577-021-00524-z. Epub 2021 Apr 8.
- Kopfnagel V, Dreyer S, Zeitvogel J, Pieper DH, Buch A, Sodeik B, Rademacher F, Harder J, Werfel T. Free human DNA attenuates the activity of antimicrobial peptides in atopic dermatitis. Allergy. 2021 Oct;76(10):3145-3154. doi: 10.1111/all.14992. Epub 2021 Jul 16.
- Schuler CF 4th, Tsoi LC, Billi AC, Harms PW, Weidinger S, Gudjonsson JE. Genetic and Immunological Pathogenesis of Atopic Dermatitis. J Invest Dermatol. 2024 May;144(5):954-968. doi: 10.1016/j.jid.2023.10.019. Epub 2023 Dec 11.
Liens utiles
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Réel)
Achèvement primaire (Estimé)
Achèvement de l'étude (Estimé)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
- Maladies génétiques, innées
- Maladies du système immunitaire
- Hypersensibilité immédiate
- Hypersensibilité
- Maladies de la peau
- Maladies de la peau, Génétique
- Maladies de la peau, eczémateux
- Dermatite
- Maladies et anomalies congénitales, héréditaires et néonatales
- Maladies de la peau et du tissu conjonctif
- Dermatite atopique
- Eczéma
- Techniques d'investigation
- Manipulation des échantillons
- Techniques de laboratoire clinique
- Techniques et procédures de diagnostic
- Diagnostic
- Perforation
- Procédures chirurgicales, opératoires
- Collection d'échantillons de sang
Autres numéros d'identification d'étude
- 2025ZDSYLL537P01
Plan pour les données individuelles des participants (IPD)
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Description du régime IPD
Informations sur les médicaments et les dispositifs, documents d'étude
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