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Deciphering cellular signalling to cure graft-versus-host disease (GVHD) and leukemia relapse

Project description

Targeting immune signalling after allogeneic hematopoietic cell transplantation

Allogeneic hematopoietic cell transplantation (allo-HCT) is a procedure where patients receive hematopoietic stem cells from a healthy donor to treat aggressive blood cancers. While it can be curative, it carries major risks because the donor immune system may attack the patient’s tissues or fail to control residual leukemia. Acute graft-versus-host disease (GVHD) and leukaemia often relapse together, leading to post-transplant deaths. The goal of the ERC-funded AlloCure project is to investigate the mechanisms that trigger GVHD, sustain inflammation, and allow leukaemia cells to escape immune attack. To achieve this, researchers will employ advanced imaging, molecular profiling and experimental models. Project findings will help pave the way for personalised interventions to improve survival after transplantation.

Objective

Acute graft-versus-host disease (GVHD) and leukemia relapse cause 75% of the mortality of patients having undergone allogeneic hematopoietic cell transplantation (allo-HCT). A better understanding of signalling in immune cells, tissue specific cell types and leukemia cells is key to develop novel therapies against GVHD and leukemia relapse. The ambitious overall goal of AlloCure is to identify the pathogenic events that initiate GVHD (1), maintain therapy-refractory GVHD (2) and mediate immune escape causing leukemia relapse (3). To address these high risk/high gain questions novel methods and developments across disciplines are required. (1) I hypothesize that a loss of to date unexplored intestinal enteroendocrine cells promotes GVHD initiation. To study these small cell subsets, we will use reporter genes and novel imaging methods to systematically evaluate their fate and signalling during intestinal GVHD. (2) Signalling propagating refractory GVHD is not well-understood. Our phospho-proteomics data set from corticosteroid- and ruxolitinib-refractory GVHD patients will instruct selective analysis of kinase activation in immune cells and enterocytes by using genetic Cre-lox-based and pharmacological approaches. (3) I have shown that leukemia-derived lactic acid inhibits glycolysis and MEK/ERK signalling in T cells, thereby impairing graft-versus-leukemia (GVL) effects. Here, I will decipher which other leukemia-derived metabolites mediate pathogenic signalling in immune cells and test if oncogenic signalling in leukemia cells drives immunosuppressive metabolite production. To enhance GVL we will inhibit pathogenic kinase activation in leukemia cells and myeloid suppressor cells. Using high risk/high gain approaches in a combination of murine and human studies AlloCure aims to develop individualized therapeutic strategies to interfere with pathogenic signalling responsible for GVHD or leukemia relapse to reduce the mortality rate of patients undergoing allo-HCT.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

(opens in new window) ERC-2022-ADG

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Host institution

UNIVERSITAETSKLINIKUM FREIBURG
Net EU contribution
€ 2 498 943,00
Address
HUGSTETTER STRASSE 49
79106 Freiburg
Germany
Region
Baden-Württemberg Freiburg Freiburg im Breisgau, Stadtkreis
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 2 498 945,00

Beneficiaries (1)