Monocytic Expression of HLA-DR After Liver Transplantation (EdMonHG)
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|ClinicalTrials.gov Identifier: NCT03995537|
Recruitment Status : Recruiting
First Posted : June 24, 2019
Last Update Posted : March 2, 2020
A defect of the immune response has been described in patients with severe liver disease. This immune-paresis is partly driven by a compensatory anti-inflammatory response following a systemic inflammatory response syndrome and affects the innate immune response. The innate immune defect has been described in patients with advanced cirrhosis and more significantly in patients with acute liver failure or acute on chronic liver failure (ACLF). The monocytes/macrophages pro-inflammatory response and finally the antimicrobial response are thus strongly impaired, leading to higher sepsis risk. The monocytes/macrophages phenotype associated with these functional alterations has been widely described, with a weaker expression of Human Leukocyte Antigen - DR isotype (HLA-DR) on the monocytes surface, correlated with poor outcomes. The low monocytic expression of HLA-DR, its functional and clinical impact has been widely described in the context of septic shock with similar pathophysiological mechanisms.
Liver transplantation (LT) is often the only therapeutic option for patients with advanced liver failure. Post-transplant survival of the most severe patients is similar to the survival in the whole population of LT patients, but the complication rate remains higher, with a major risk of infection. Currently used immunosuppression protocols do not take into account the quality of pre-transplant immune response. Some treatments, such as corticosteroids, which are widely used for the induction of post-transplant immunosuppression, may affect the innate immune response. However, it has been shown that low expression of post-transplant monocyte HLA-DR was associated with a greater risk of septic complication.
The general objective of this study is to focus on the evolution of a robust marker of immune dysfunction, HLA-DR monocyte expression, before and following LT, and to analyse its post LT expression depending on the level of pre-transplant expression as well as its association with post-transplant complications. This study will bring new insights for the design of a prospective study on the relevance of adapting post-transplant immunosuppression protocols to HLA-DR expression on monocytes surface, which is a robust marker of the innate immune response.
Evaluation of innate immune dysfunction pre-LT by quantification of monocytic HLA-DR expression and monitoring of its post-LT kinetics may be relevant for assessing post-transplant immune status and adapting immunosuppressive therapy. A descriptive, observational study associating clinical and biological data is needed to confirm the relevance of HLA-DR expression quantification on the surface of monocytes in a population of selected patients, before and after LT. These data will allow setting up a prospective interventional study reporting the possible benefit of post-transplant immunosuppressive treatment modulation, according to the HLA-DR monocyte dosage and its kinetics evolution.
The main objective of this study is to describe the association between evolution of monocytic HLA-DR expression on monocytes/macrophages surface during the first month after LT and the occurrence of one of the 2 following clinical events reflecting a post LT immune dysfunction (acute cell rejection and sepsis).
|Condition or disease||Intervention/treatment|
|Liver Diseases Liver Transplantation Cirrhosis, Liver||Biological: blood sample|
|Study Type :||Observational|
|Estimated Enrollment :||100 participants|
|Official Title:||Monocytic Expression of HLA-DR After Liver Transplantation|
|Actual Study Start Date :||February 26, 2020|
|Estimated Primary Completion Date :||September 26, 2021|
|Estimated Study Completion Date :||September 26, 2021|
Patients with severe liver disease waiting liver transplant
Only patients with the most frequent LT indications will be eligible: complicated cirrhosis of hepatocellular carcinoma (HCC), acute or chronic decompensation of cirrhosis, with or without multi-visceral failure and fulminant hepatitis.
Biological: blood sample
Samples will be collected at the inclusion and repeated if necessary before LT, including one 4 mL EDTA sample and one 4 mL Heparin sample and one 2.5 mL PAXgene® sample, allowing the HLA-DR assay to be performed with also plasma aliquots and messenger RNAs.
Same samples will also be collected :
Biological data will be collected at those different times.
- number of receptors expressed by monocytes [ Time Frame: 7 months ]
Primary outcome will be the kinetics of HLA-DR expression on the monocytes / macrophages surface during the first month after LT as a function of pre-LT status (Nadir, normalization delay of HLA-DR expression) and its association with 2 clinical events reflecting post-LT immune dysfunction (acute cell rejection and sepsis).
Expression of HLA-DR is measured by the number of receptors expressed by monocytes and measured by flow cytometry at different times: at inclusion (D0), the day of LT and twice a week for 1 month in post LT.
Biospecimen Retention: Samples Without DNA
One samples of Ethylenediaminetetraacetic acid (EDTA) (4 millilitre (mL)), one Heparin sample (4mL) and one PAXgene® sample (2.5mL) will be collected:
- at inclusion
- between inclusion and LT in case of major clinical change
- During the pre-transplant follow-up 3 months after inclusion, for patients who have not been transplanted within 3 months following inclusion. At 6 months post-inclusion, non-transplanted patients will terminate the study prematurely
- at day 1 after LT
- 2 times a week after the LT for a maximum of 1 month
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03995537
|Contact: Fanny Lebossé, MD,PhD||04 26 10 93 39 ext +firstname.lastname@example.org|
|Centre Hospitalier de la Croix Rousse||Recruiting|
|Lyon, France, 69004|
|Contact: Fanny LEBOSSE, MD,PhD 04 26 10 93 39 ext +33 email@example.com|
|Principal Investigator: Fanny LEBOSSE, MD,PhD|