• Preclinical development
  • ALL
  • AML
  • Cell therapy
  • Immunotherapy
  • Preclinical research (TRL 4-5)

Mouse models of allogenic transplantation for the study of new treatments to prevent or treat graft-versus-host disease (GvHD) or stimulate the antitumor response induced by the donor’s T-cells (Graft-versus-leukemia (GVL) effect).

The model can be used to study new therapeutic solutions, from target identification to the validation of drug candidates.


Description

Scope of research activities

In vivo preclinical research using a mouse model mimicking patients with leukemia (AML and ALL) or lymphoma, treated by allogeneic transplantation, in the case of graft-versus-host disease or relapse: 

  • Action mechanisms
  • Targets identification and validation
  • Drug screening
  • Evaluation of therapeutic potential (i.e. efficacy) 
  • Toxicity assessment (pre-regulatory)

Conduct of studies

Steps:

  • Identification of relevant animal models according to the question raised, including models of acute or chronic GVH induced by major or minor antigenic incompatibilities, choice of the most relevant model of hematologic malignancies. 
  • Definition of experimental conditions to test the hypothesis or scientific question, including the use of syngeneic controls or allogeneic T-cell-free transplants, and definition of response assessment modalities (small animal imaging, bioluminescence, conventional, confocal or biphotonic microscopy, flow or mass cytometry, global or single-cell transcriptomics) and relevant response markers.
  • Preparation of regulatory applications for the implementation of animal experimentation after detailed writing of the experimental plan.
  • Implementation of experiments following study planning, organization of interim meetings to monitor project progress and results.
  • Final analysis and communication of results and conclusions

Research infrastructure 

Experimental and analytical platforms:

  • Animal facility
  • Cytometry, imaging and sequencing platform
  • Cytometer and cell sorter available in the team
  • Single-cell RNA sequencing using 10X genomics technology (CITE-seq, scRNA-seq, scATAC-seq, TCR-seq)
  • A bioinformatics engineer to analyze results

Specifications

The platform

Preclinical mouse models of allogeneic transplantation.

Studies

Model of acute GVH due to major incompatibility (Balb/c in C57Bl/6 or C3H in C57Bl/6):

  • Clinical GVH score
  • Histological score of damaged tissue 
  • Blood or tissue immunophenotyping (cytometry)
  • Confocal or immunofluorescence microscopy

Model of acute GVH due to multiple (C3H/SW in C57Bl/6) or single (Matahari in C57Bl/6) minor incompatibility:

  • Clinical GVH score
  • Histological score of damaged tissue 
  • Blood or tissue immunophenotyping (cytometry)
  • Confocal or immunofluorescence microscopy

Model of anti-tumor response by injection of leukemic cells µMyc (ALL B) in the above allograft models:

  • Evaluation of tumor infiltration by cytometry (bone marrow, lymph node, spleen)
  • Evaluation of tumor infiltration by microscopy 
  • Measurement of tumor cell apoptosis by caspase 3 activity reporter probe (µMyc-DEVD)

Examples of partnerships

TNFR2 blockade for modulation of antitumor immune response after hematopoietic stem-cell transplantation – Blocking the tumor necrosis factor receptor-type 2 (TNFR2) pathway induces the complete loss of the protective function of regulatory T cells (Tregs) in a model of graft-versus-host disease (GVHD) prevention that relies on Treg-based cell therapy. In this study, we tested the possibility of amplifying the antitumor response by targeting TNFR2 in a model of tumor relapse following hematopoietic stem-cell transplantation, a clinical situation for which the need for efficient therapeutic options is still unmet.

Partners: IMRB, Inserm - Université Paris-Est Créteil Val de Marne, Créteil (Pr José Cohen)


Terms

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