Identifying New Therapeutic Targets for Lupus Treatment (ELUDIAL)

Lupus is an autoimmune disease affecting mainly young women (9/1). Lupus nephritis (LN) occurs in 30% of the cases of lupus and is associated with end stage renal disease (ESRD) in 17 to 25% of cases after 10 years. Overall, nearly 7% of lupus patients will develop ESRD due to LN. Historically, 5-year survival after LN was lower than 20%. Nowadays, 45% of patients suffer from multiple relapses that are associated with an intermediate risk of ESRD. When ESRD occurs, lupus activity decreases progressively to reach a stable extinct state. At this stage it is possible to stop all medications to control lupus, without any flare of lupus activity. Lupus extinction following ESRD corresponds to a state of complete remission. Obtaining such a result before ESRD would avoid damages to several organs and side effects of immunosuppressive therapy. Understanding the mechanisms responsible for lupus extinction following ESRD is an innovative approach to decipher lupus pathophysiology. The objective of the study is to identify the mechanisms responsible for lupus extinction and to propose new therapeutic options based on these new mechanisms. Mechanisms responsible for lupus extinction are unknown. Lupus extinction depends on the duration of ESRD. Accumulation of several toxins that kidneys would normally eliminate in the urine is a hallmark of ESRD. Such toxins are called "uremic toxins" since they accumulate during "uremia" (ESRD). They affect biological systems such as fertility and immunity that are both closely related to lupus pathophysiology. The investigators hypothesize that studying LN extinction after ESRD will provide novel therapeutic targets to extinct lupus before ESRD. To this end, they will investigate several non-exclusive hypotheses based on previous findings of our consortium, or issued from clinical observations: the sexual dysfunction hypothesis and the ESRD-associated immune cells dysfunction hypothesis. In parallel, they will conduct an open screening of new mechanisms underlying the lupus extinction through the characterization of the differential gene expression profile associated with lupus extinction in patients undergoing dialysis.

Study Overview

• Status: Completed
• Conditions: Lupus Nephritis

Detailed Description

Lupus is an autoimmune disease affecting mainly young women (9/1). Lupus nephritis (LN) occurs in 30% of patients and is associated with end stage renal disease (ESRD) in 17 to 25% of cases after 10 years. Overall, nearly 7% of lupus patients will develop ESRD due to LN. Historically, the 5-year survival after LN was below 20%. Nowadays, 45% of patients suffer from multiple relapses that are associated with an intermediate risk of ESRD. When ESRD occurs, lupus activity decreases progressively to reach a stable extinct state. At this stage it is possible to stop all medications to control lupus, without any flare of lupus activity. Lupus extinction following ESRD corresponds to a state of complete remission. Obtaining such a result before ESRD would prevent the damages of active lupus to several organs and side effects of immunosuppressive therapy. Understanding the mechanisms responsible for lupus extinction following ESRD is an innovative approach to decipher lupus pathophysiology.

The objective of this study is to identify the mechanisms responsible for lupus extinction in ESRD (candidate pathways) and to propose new therapeutic options targeting those candidates.

There is an important need for treatment innovation for systemic lupus and LN. A large number of biotherapies have been developed recently based on the known pathophysiology of the disease. Despite important efforts made by the medical community, many research groups, and pharmaceutical companies, randomized clinical trials (RCT) failed to validate innovative treatment strategies for several decades. This project proposes the identification of new treatment solutions through explorations in a field free of previous investigation in that aim.

A detailed knowledge of lupus extinction is required to understand its pathophysiology. This study will detail the timeframe of, and the factors associated with lupus extinction after ESRD. Moreover, previous investigations had been conducted separately in different projects and mainly provided descriptive results. Then a global and integrative strategy of research will be built in an attempt to embrace the subject as broadly as possible and maximize the opportunities to obtain successful outcome. The project will investigate specific hypotheses that were developed from the investigators' experience and based on the expertise of the consortium, both in lupus and immune dysfunction and in ESRD and uremic toxins. The addition of a "without a priori" approach by a systematic screening of gene expression associated with lupus extinction in haemodialysis will allow the investigators to propose a large panel of potential candidates to investigate further. Altogether, identifying the causes responsible for lupus extinction following ESRD is an innovative approach to discover new therapeutic targets. The investigators hypothesize that mimicking LN extinction due to ESRD provides a unique opportunity to propose new strategies to treat active lupus and LN before ESRD. The mechanisms responsible for lupus extinction are unknown. Lupus extinction depends on the duration of ESRD. Accumulation of several toxins that kidneys would normally eliminate in the urine is a hallmark of ESRD. Such toxins are called "uremic toxins" since they accumulate during "uremia" (ESRD). They affect biological systems such as fertility and immunity that are both closely related to lupus pathophysiology.

The investigators hypothesize that studying lupus extinction after ESRD will provide novel therapeutic targets to extinct lupus before ESRD. To this end, they propose to investigate several non-exclusive hypotheses based on previous findings: the sexual dysfunction hypothesis and the ESRD-associated immune cells dysfunction hypothesis. In parallel, they will conduct an open screening of new mechanisms underlying the lupus extinction through the characterization of the differential gene expression profile associated with lupus extinction in patients on chronic haemodialysis, comparing gene expression of dialysis patients with extinct lupus versus patients with still active lupus at the time of the study.

They first propose a comparison of active and extinct lupus in patients with ESRD. Lupus patients on chronic haemodialysis in Ile-de-France (n=75) will be recruited for the biological and clinical comparison between patients with persistent lupus activity to those with extinct lupus. These dialysis patients have been identified from the national REIN registry, which prospectively collects data for all incident patients undergoing renal replacement therapy (dialysis or kidney transplantation). A specific authorization was obtained from the Scientific Board of the REIN Registry at Agency of Biomedicine). Additionally, patients with active lupus prior to treatment and no ESRD will serve as a "positive control" group (n=45) for markers of cellular activation and blood transcriptomic profile during lupus nephritis.

• Study Type: Observational
• Enrollment (Actual): 87

Contacts and Locations

Study Locations

• France
  • Paris, France, 75018
    • Hopital Bichat

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

Study Population

Lupus patients on chronic haemodialysis in Ile-de-France (n=75) will be recruited for biological and clinical comparison between patients with persistent lupus activity to those with extinct lupus. These dialysis patients have been identified from the national REIN registry, which prospectively collects data for all incident patients undergoing renal replacement therapy (dialysis or kidney transplantation).

Additionally, patients with active lupus prior to treatment and no ESRD will serve as a "positive control" group (n=45) for markers of cellular activation and blood transcriptomic profile during lupus nephritis.

Healthy controls are required to establish reference values for assays specifically developed for the ELUDIAL study.

Description

INCLUSION CRITERIA

For the group of 75 patients on hemodialysis

• Age ≥ 18 years,
• History of biopsy-proven lupus nephritis (all classes of lupus nephritis)

For the group of 45 patients with active lupus, not on hemodialysis

• Age ≥ 18 years,
• Biopsy-proven ACTIVE lupus nephritis

For the group of 20 healthy individuals

• Age ≥ 18 years

EXCLUSION CRITERIA

For the group of 75 patients on hemodialysis

• No written informed consent
• Past-history of kidney transplantation
• Active infection
• Active allergy (such as hay fever)
• Pregnant or breastfeeding women
• Non-affiliation to a social security regime
• Protected adults (individuals under guardianship by court order)

For the group of 45 patients with active lupus, not on hemodialysis

• No written informed consent
• Immunosuppressive therapy (except corticosteroids)
• Corticosteroids pulse before renal biopsy
• Pregnant or breastfeeding women
• Non-affiliation to a social security regime
• Protected adults (individuals under guardianship by court order)

For the group of 20 healthy individuals

• No written informed consent
• Immunosuppressive therapy (including corticosteroids)
• History of autoimmune disease
• Pregnant or breastfeeding women
• Non-affiliation to a social security regime
• Protected adults (individuals under guardianship by court order)

Study Plan

How is the study designed?

Number of groups / cohorts

3

Cohorts and Interventions

Group / Cohort
Healthy individuals
Patients with ESRD; Patients with history of biopsy-proven lupus nephritis (all classes of lupus nephritis)
Patients with active lupus prior to treatment and no ESRD; Patients with biopsy-proven ACTIVE lupus nephritis

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Nombre of patients treated by sequential haemodialysis with lupus extinction	non-renal SELENA SLEDAI score < 4 and absence	Inclusion

Collaborators and Investigators

• Sponsor: Assistance Publique - Hôpitaux de Paris
• Collaborators: Institut National de la Santé Et de la Recherche Médicale, France
• Investigators: Principal Investigator: Eric DAUGAS, MD PhD, Assistance Publique - Hôpitaux de Paris

Study record dates

Study Major Dates

• Study Start (Actual): June 18, 2019
• Primary Completion (Actual): August 11, 2022
• Study Completion (Actual): August 11, 2022

Study Registration Dates

• First Submitted: April 16, 2019
• First Submitted That Met QC Criteria: April 16, 2019
• First Posted (Actual): April 19, 2019

Study Record Updates

• Last Update Posted (Actual): July 21, 2023
• Last Update Submitted That Met QC Criteria: July 19, 2023
• Last Verified: July 1, 2023

More Information

Terms related to this study

• Keywords: haemodialysis; Lupus nephritis
• Additional Relevant MeSH Terms: Immune System Diseases; Autoimmune Diseases; Kidney Diseases; Urologic Diseases; Connective Tissue Diseases; Glomerulonephritis; Lupus Erythematosus, Systemic; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Male Urogenital Diseases; Nephritis; Lupus Nephritis
• Other Study ID Numbers: APHP180500

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No