- ICH GCP
- Yhdysvaltain kliinisten tutkimusten rekisteri
- Kliininen tutkimus NCT07680010
Model Early Immunologic Stages of Pediatric Hematological Pre-lupus (PRELUDE)
Model Early Immunologic Stages of Pediatric Hematological Pre-lupus in Order to Prevent SLE in Children.
Tutkimuksen yleiskatsaus
Tila
Yksityiskohtainen kuvaus
The development of an autoimmune disease (AID) requires several years. In systemic lupus erythematosus (SLE), anti-nuclear antibodies (ANA) appear several years before the onset of the disease. However, it is difficult to identify the early mechanisms of autoimmunity in humans as most patients' samples are obtained at the time of diagnosis.
We hypothesize that immune thrombocytopenic purpura (ITP) in children provides a unique model for understanding the initial mechanisms leading to autoimmunity. Children with ITP have common immune system dysfunctions leading to the production of anti-platelet antibodies. However, despite this supposedly common dysfunction, the course and degree of loss of tolerance of the immune system are very heterogeneous: the disease is transient in 75 to 80% of cases, and 15 to 20% of children with ITP have ANA and their course is usually persistent or chronic. This subgroup of children with hematological AID, ITP ANA+ meets the criteria for a broader form of AID: pre-lupus. We have recently shown that 16% of these children with pre-lupus / ITP-ANA+ progressed to complete SLE within a median of 3.8 years. Why do some children have transient or persistent ITP? limited or systemic ITP? We aim to describe the shared and/or unique immunological pathways involved at diagnosis in children with ITP ANA- (transient or persistent), with ITP ANA+ (pre-lupus condition, transient or persistent), and in patients with SLE (persistent by definition) In this exploratory, prospective, bi-centric cohort study, we will include 70 children with ITP and 20 children with SLE newly diagnosed, over 36 months with a 3-month follow-up for children with ITP-ANA- and SLE and a 48-month follow-up for children with ITP-ANA+. ANA positivity will be defined by a titer ≥ 1/160. Blood samples will be collected at inclusion and at 3 months (bio-collection), and further each 6 months for children with ITP-ANA+. ITP status will be defined at 3 months: transient or persistent. We will analyze the signaling pathways (B and T lymphocytes, cytokines, disruption of tolerance and inactivation of X) involved in these different pathophysiological distinct subgroups
Opintotyyppi
Ilmoittautuminen (Arvioitu)
Vaihe
- Ei sovellettavissa
Yhteystiedot ja paikat
Opiskeluyhteys
- Nimi: Nathalie ALADJIDI, MD
- Sähköposti: nathalie.aladjidi@chu-bordeaux.fr
Tutki yhteystietojen varmuuskopiointi
- Nimi: Jérôme GRANEL, MD
- Puhelinnumero: +33 5 57 82 02 55
- Sähköposti: jerome.granel@chu-bordeaux.fr
Opiskelupaikat
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Bordeaux, Ranska, 33076
- Chu de Bordeaux- Groupe Hospitalier Pellegrin - Hôpital des Enfants
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Ottaa yhteyttä:
- Jérôme GRANEL, MD
- Puhelinnumero: +33 5 57 82 02 55
- Sähköposti: jerome.granel@chu-bordeaux.fr
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Toulouse, Ranska, 31026
- CHU Toulouse - Hôpital des Enfants
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Ottaa yhteyttä:
- Marlène PASQUET, PROF
- Puhelinnumero: +33 5 34 55 86 43
- Sähköposti: pasquet.m@chu-toulouse.fr
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Osallistumiskriteerit
Kelpoisuusvaatimukset
Opintokelpoiset iät
- Lapsi
- Aikuinen
Hyväksyy terveitä vapaaehtoisia
Kuvaus
Inclusion criteria:
For patients :
- Child or adolescent with newly diagnosed ITP or SLE according to the specific definitions of ITP or SLE, prior to any treatment,
- Over 1 and under 18 years of age at diagnosis, weighing more than 7 kg.
- Written consent from parents or guardians,
- Patient affiliated to a social security scheme.
For controls :
- Over 1 and under 18 years of age at diagnosis, weighing more than 7 kg.
- Follow-up in the day hospital at the Bordeaux University Hospital, for a condition that does not affect the immune system
- Matched on age,
- Written consent from parents or guardians,
- Patient affiliated to a social security scheme
Exclusion criteria:
For patients :
- ITP secondary to a known cause: previous or concomitant immune deficiency, bone marrow or organ transplantation, other autoimmune disease, Evans syndrome (autoimmune hemolytic anemia or autoimmune neutropenia present at ITP diagnosis) or cancer with immunosuppressive therapy.
- Treatment with immunomodulation or immunosuppressants (including immunoglobulins, corticoids, hydroxychloroquine), started prior to inclusion (day of sampling).
- Pregnant women, women in labour and breastfeeding women
For controls :
- Suffering from an immunological disease,
- Infection within fifteen days prior to inclusion,
- Immunomodulatory therapy.
- Pregnant women, women in labour and breastfeeding women
Opintosuunnitelma
Miten tutkimus on suunniteltu?
Suunnittelun yksityiskohdat
- Ensisijainen käyttötarkoitus: Muut
- Jako: Ei satunnaistettu
- Inventiomalli: Rinnakkaistehtävä
- Naamiointi: Ei mitään (avoin tarra)
Aseet ja interventiot
Osallistujaryhmä / Arm |
Interventio / Hoito |
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Muut: Säätimet
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Blood sampling is a routine biological procedure performed under the same conditions as during a follow-up consultation.
Monitoring for Systemic Lupus Erythematosus according to SLICC 2012 classification criteria
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Muut: ITP-ANA-
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Blood sampling is a routine biological procedure performed under the same conditions as during a follow-up consultation.
Monitoring for Systemic Lupus Erythematosus according to SLICC 2012 classification criteria
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Muut: ITP-ANA+
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Blood sampling is a routine biological procedure performed under the same conditions as during a follow-up consultation.
Monitoring for Systemic Lupus Erythematosus according to SLICC 2012 classification criteria
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Muut: SLE
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Blood sampling is a routine biological procedure performed under the same conditions as during a follow-up consultation.
Monitoring for Systemic Lupus Erythematosus according to SLICC 2012 classification criteria
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Mitä tutkimuksessa mitataan?
Ensisijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
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Characterisation of B and T lymphocyte populations
Aikaikkuna: Baseline, Month 3 visit.
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Characterisation of B and T lymphocyte populations through the study of surface markers and intracellular factors.
This panel will, in particular, enable the identification of effector B cells such as plasma blasts, subsets of auto-reactive 'double-negative' (DN) B cells, regulatory B cells, and follicular T helper (Tfh) and peripheral extra-follicular T helper (Tph) cells.
Each population will be compared between the patients and the control group.
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Baseline, Month 3 visit.
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Plasma markers
Aikaikkuna: Baseline, Month 3 visit.
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Soluble cytokines and factors regulating B-cell survival (BAFF, TACI, IL-6, IL-12p70, IFN-γ, IFN-β, TGF-β, and the IFN-regulated chemokine CXCL10) will be quantified in plasma using a customised multiplex Luminex assay.
Interferon alpha levels will be specifically measured using ultra-sensitive SIMOA (Single Molecule Array) technology.
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Baseline, Month 3 visit.
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Plasma markers
Aikaikkuna: Baseline, Month 3 visit.
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Circulating plasma autoantigens - soluble P-selectin and CD40L derived from platelet activation - will be measured by ELISA.
The levels of circulating and mitochondrial DNA will be measured by quantitative RT-PCR in collaboration with V. Sisirak (DR CNRS, Immunoconcept).
The overall activity of plasma DNases will be determined by an in vitro DNA degradation assay.
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Baseline, Month 3 visit.
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Toissijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
|---|---|---|
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Single-cell transcriptomic analysis
Aikaikkuna: Baseline, Month 3 visit , Month 6 visit , Month 12 visit, Month 18 visit, Month 24 visit , Month 30 visit, Month 36 visit, Month 42 visit and Month 48 visit.
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Using single-cell RNA sequencing, a single-cell transcriptomic analysis, we will be able to quantify and analyse the transcriptomes of lymphocytes B This will enable us to characterise heterogeneous cell populations, as well as to reconstruct cell development pathways and model transcriptomic dynamics. This technique will enable the modelling of signalling pathways involving B lymphocytes in the subgroup of ITP patients with positive AAN titres, and the development of an algorithm and a mathematical model of the progression of these cellular and molecular markers |
Baseline, Month 3 visit , Month 6 visit , Month 12 visit, Month 18 visit, Month 24 visit , Month 30 visit, Month 36 visit, Month 42 visit and Month 48 visit.
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Single cell epigenetic analysis
Aikaikkuna: Baseline, Month 3 visit , Month 6 visit , Month 12 visit, Month 18 visit, Month 24 visit , Month 30 visit, Month 36 visit, Month 42 visit and Month 48 visit.
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Using single-cell ATAC sequencing, we will be able to analyse the regions of DNA accessible to the transcription machinery. This will enable us to identify regulatory programmes such as signalling pathways. The analysis will also reveal heterogeneity amongst B-cell subpopulations, which may respond differently to signals. This will provide insight into the epigenetic status of genes, or at least into which factors regulate this signalling pathway and how the cell adjusts its response depending on its situation or stage of maturity, or on the signal itself. |
Baseline, Month 3 visit , Month 6 visit , Month 12 visit, Month 18 visit, Month 24 visit , Month 30 visit, Month 36 visit, Month 42 visit and Month 48 visit.
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Yhteistyökumppanit ja tutkijat
Sponsori
Tutkijat
- Päätutkija: Jérôme GRANEL, MD, University Hospital, Bordeaux
Opintojen ennätyspäivät
Opi tärkeimmät päivämäärät
Opiskelun aloitus (Arvioitu)
Ensisijainen valmistuminen (Arvioitu)
Opintojen valmistuminen (Arvioitu)
Opintoihin ilmoittautumispäivät
Ensimmäinen lähetetty
Ensimmäinen toimitettu, joka täytti QC-kriteerit
Ensimmäinen Lähetetty (Todellinen)
Tutkimustietojen päivitykset
Viimeisin päivitys julkaistu (Todellinen)
Viimeisin lähetetty päivitys, joka täytti QC-kriteerit
Viimeksi vahvistettu
Lisää tietoa
Tähän tutkimukseen liittyvät termit
Avainsanat
Muita asiaankuuluvia MeSH-ehtoja
- Sytopenia
- Patologiset prosessit
- Sidekudostaudit
- Autoimmuunisairaudet
- Immuunijärjestelmän sairaudet
- Verenvuoto
- Ihon ilmenemismuodot
- Hematologiset sairaudet
- Veren hyytymishäiriöt
- Hemorragiset häiriöt
- Verihiutaleiden häiriöt
- Tromboottiset mikroangiopatiat
- Purppura, trombosytopeeninen
- Purpura
- Trombosytopenia
- Patologiset tilat, merkit ja oireet
- Iho- ja sidekudostaudit
- Merkit ja oireet
- Hemic- ja imusuutteet
- Lupus erythematosus, systeeminen
- Purppura, trombosytopeeninen, idiopaattinen
Muut tutkimustunnusnumerot
- CHUBX 2025/052
Lääke- ja laitetiedot, tutkimusasiakirjat
Tutkii yhdysvaltalaista FDA sääntelemää lääkevalmistetta
Tutkii yhdysvaltalaista FDA sääntelemää laitetuotetta
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Ventus Therapeutics U.S., Inc.RekrytointiSysteeminen lupus erythematosus | SLE | Ihon lupus erythematosus (CLE) | CLE | SLE (systeeminen lupus)Yhdysvallat, Ranska, Etelä-Afrikka, Bulgaria, Georgia, Unkari, Puola, Espanja
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Cullinan Therapeutics Inc.RekrytointiSLE | SLE (systeeminen lupus)Yhdysvallat, Ranska, Australia, Georgia, Bulgaria, Moltova, Romania
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EMD Serono Research & Development Institute, Inc.Merck KGaA, Darmstadt, GermanyRekrytointiSysteeminen lupus erythematosus (SLE) | Ihon lupus erythematosus (CLE)Yhdysvallat
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EMD Serono Research & Development Institute, Inc.Merck KGaA, Darmstadt, GermanyEi vielä rekrytointiaSysteeminen lupus erythematosus (SLE) | Ihon lupus erythematosus (CLE)Yhdysvallat
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Progentec Diagnostics, Inc.Oklahoma Center for the Advancement of Science and TechnologyTuntematonSLE | Lupus erythematosus | Järjestelmä; Lupus erythematosus | Lupus FlareYhdysvallat
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HC Biopharma Inc.Ei vielä rekrytointiaSysteeminen lupus erythematosus (SLE) | Ihon lupus erythematosus (CLE)Kiina
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Wuhan Union Hospital, ChinaEi vielä rekrytointiaSysteeminen lupus erythematosus (SLE)Kiina
Kliiniset tutkimukset Blood sampling baseline and M3
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Carlos Simon FoundationRekrytointiPreeklampsiaEspanja