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Expression of TSLP Isoforms in Asthma

24. August 2026 aktualisiert von: Medical University of Warsaw

TSLP and Its Isoforms (Short and Long Form TSLP) in Different Asthma Phenotypes

Asthma is a heterogeneous disease characterized by chronic airway inflammation, leading to variable airflow obstruction, bronchial hyperresponsiveness, excessive mucus secretion, and, consequently, structural airway remodeling. Asthma is defined by the presence of symptoms such as wheezing, dyspnea, chest tightness, and cough, with variable intensity and frequency.

Thymic stromal lymphopoietin (TSLP) is a cytokine produced primarily by epithelial cells in the lungs. Two distinct isoforms of TSLP have been identified: a long form (lfTSLP) and a short form (sfTSLP). The long isoform is induced during inflammatory conditions and promotes a T2-dependent immune response. In contrast, the short isoform is believed to exert homeostatic and anti-inflammatory functions and exhibits antimicrobial properties.

Studies have demonstrated an association between elevated serum and airway TSLP levels and increased disease severity, as well as reduced spirometric parameters. However, the literature contains limited data regarding the expression of TSLP isoforms across different asthma phenotypes and their relationship with the degree of disease control.

The goal of this study is:

  1. To assess the expression of TSLP protein and TSLP mRNA, including its isoforms (sfTSLP and lfTSLP), in serum and in airway-derived samples (nasal epithelial cells),
  2. To compare these levels among patients with different asthma phenotypes (allergic and non-allergic asthma; eosinophilic, neutrophilic, and paucigranulocytic asthma; early-onset and late-onset asthma; obesity-associated asthma; cough-variant asthma), as well as between patients with asthma and healthy controls.
  3. To analyze the correlations between the expression of TSLP isoforms (sfTSLP and lfTSLP) and asthma severity, level of disease control (as measured by the Asthma Control Questionnaire [ACQ]), pulmonary function parameters, blood eosinophil count and other clinical parameters.

Studienübersicht

Status

Rekrutierung

Bedingungen

Intervention / Behandlung

Studientyp

Beobachtungs

Einschreibung (Geschätzt)

70

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studienorte

    • Warsaw
      • Warsaw, Warsaw, Polen, 02-097
        • Rekrutierung
        • Department of Internal Medicine, Pulmonary Diseases and Allergy, Medical University of Warsaw, Warsaw, Poland,
        • Kontakt:
        • Hauptermittler:
          • Marta Dąbrowska, MD, PhD, Associate Professor
        • Unterermittler:
          • Izabela Orzołek, MD

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

  • Erwachsene
  • Älterer Erwachsener

Akzeptiert gesunde Freiwillige

Ja

Probenahmeverfahren

Nicht-Wahrscheinlichkeitsprobe

Studienpopulation

Patients with severe asthma, with different asthma phenotypes (allergic and non-allergic asthma; eosinophilic, neutrophilic, and paucigranulocytic asthma; early-onset and late-onset asthma; obesity-associated asthma; cough-variant asthma).

Beschreibung

  1. Inclusion criteria

    • age > 18 years, without the upper age limit,
    • asthma (diagnosis in accordance with the GINA 2023 guidelines),
  2. Exclusion criteria

    • other respiratory diseases (e.g., chronic obstructive pulmonary disease [COPD]);
    • active cigarette smoking or a smoking history of >10 pack-years;
    • active malignancy;
    • active pulmonary tuberculosis or active respiratory tract infection;
    • use of antibiotics within 4 weeks prior to study enrollment;
    • current long-term home oxygen therapy (>15 hours per day);
    • current treatment with monoclonal antibody therapies (e.g., omalizumab, mepolizumab, reslizumab, dupilumab, tezepelumab, or other biologics);
    • pregnancy.

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

Kohorten und Interventionen

Gruppe / Kohorte
Intervention / Behandlung
Study group consists of patients with severe asthma (diagnosed according to GINA guidelines)
  1. Inclusion criteria Adults aged 18 years, without the upper age limit, diagnosed with asthma established in accordance with the GINA 2023 guidelines.
  2. Exclusion criteria Presence of other concomitant respiratory diseases (e.g., chronic obstructive pulmonary disease [COPD]); Current use of systemic glucocorticoids or immunosuppressive therapy, or use within 4 weeks prior to study enrollment; Active cigarette smoking or a smoking history of >10 pack-years; Active malignancy; Active pulmonary tuberculosis or active respiratory tract infection; Use of antibiotics within 4 weeks prior to study enrollment; Current long-term home oxygen therapy (>15 hours per day); Current treatment with monoclonal antibody therapies (e.g., omalizumab, mepolizumab, reslizumab, dupilumab, tezepelumab, or other biologics); Pregnancy.
This study is designed as a cross-sectional, observational investigation. No therapeutic or diagnostic interventions beyond routine clinical care will be introduced as part of the study. All procedures performed are limited to standard, minimally invasive sample collection and data acquisition for research purposes. Clinical management of participants will remain unchanged and will be conducted entirely at the discretion of the treating physicians. Participation in the study will not influence treatment decisions or patient care.
Control group
  1. Inclusion criteria Age above 18 years old and without the upper age limit. Negative medical history for asthma and allergic diseases.
  2. Exclusion criteria Diagnosed asthma or any other respiratory disease; Atopic dermatitis, allergic rhinitis, or other allergic diseases; Autoimmune diseases; All other exclusion criteria identical to those applied to the asthma patient group.
This study is designed as a cross-sectional, observational investigation. No therapeutic or diagnostic interventions beyond routine clinical care will be introduced as part of the study. All procedures performed are limited to standard, minimally invasive sample collection and data acquisition for research purposes. Clinical management of participants will remain unchanged and will be conducted entirely at the discretion of the treating physicians. Participation in the study will not influence treatment decisions or patient care.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
TSLP mRNA expression, including the sfTSLP and lfTSLP isoforms in nasal epithelial cells and TSLP protein expression in blood and nasal epithelial cells
Zeitfenster: This is cross-sectional studies; blood and nasal epithelial cells (nasal swab) will be taken from each study participant at one study point - through study completion, an average of 2 years

The primary endpoint of the study is the quantitative assessment of TSLP protein expression and TSLP mRNA expression, including the sfTSLP and lfTSLP isoforms, in biological material obtained from serum and nasal epithelial cells.

Peripheral venous blood samples will be collected and centrifuged to obtain serum, which will be aliquoted and stored at -80°C until analysis. Nasal epithelial cells will be collected using sterile cytology brushes. All biological samples will be processed promptly and stored under appropriate conditions prior to laboratory analysis.

TSLP protein concentrations will be measured using commercially available enzyme-linked immunosorbent assay (ELISA) kits in accordance with the manufacturer's instructions. Measurements will be performed in duplicate, and optical density will be determined using a microplate reader. Concent

This is cross-sectional studies; blood and nasal epithelial cells (nasal swab) will be taken from each study participant at one study point - through study completion, an average of 2 years

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

30. April 2024

Primärer Abschluss (Geschätzt)

1. November 2026

Studienabschluss (Geschätzt)

1. November 2026

Studienanmeldedaten

Zuerst eingereicht

23. Januar 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

24. August 2026

Zuerst gepostet (Tatsächlich)

26. August 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

26. August 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

24. August 2026

Zuletzt verifiziert

1. Januar 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Schlüsselwörter

Andere Studien-ID-Nummern

  • Medical University of Warsaw
  • 31/M/MB/N/24 (Andere Zuschuss-/Finanzierungsnummer: Young Scientist Grant, Medical University of Warsaw)

Plan für individuelle Teilnehmerdaten (IPD)

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UNENTSCHIEDEN

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

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