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10.1172/JCI182480
1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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1Division of Hematology/Oncology/Transplantation, University of Minnesota, Minneapolis, United States of America
2Division of Blood & Marrow Transplant, University of Minnesota, Minneapolis, United States of America
3Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
4Division of Hematology/Oncology, Harvard Medical School, Boston, United States of America
5Division of Hematologic Malignancies, Harvard Medical School, Boston, United States of America
6Institute of Medical Microbiology and Hygiene, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
7Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, United States of America
8Division of Molecular Medicine, University of Minnesota, Minneapolis, United States of America
9Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, United States of America
10Department of Medicine I, University Medical Centre Freiburg, Freiburg, Germany
11Kennedy Institute of Rheumatology, The University of Oxford, Oxford, United Kingdom
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Published September 30, 2025 - More info
Regulatory T-cells (Treg) are critical for maintaining immune homeostasis, and their adoptive transfer can treat murine inflammatory disorders. In patients, Treg therapies have been variably efficacious. Therefore, new strategies to enhance Treg therapeutic efficacy are needed. Treg predominantly depend upon oxidative phosphorylation (OXPHOS) for energy and suppressive function. Fatty acid oxidation (FAO) contributes to Treg OXPHOS and can be important for Treg “effector” differentiation, but FAO activity is inhibited by coordinated activity of isoenzymes acetyl-CoA Carboxylase-1 and -2 (ACC1/2). Here, we show that small molecule inhibition or Treg-specific genetic deletion of ACC1 significantly increases Treg suppressive function in vitro and in mice with established chronic GVHD. ACC1 inhibition skewed Treg towards an “effector” phenotype and enhanced FAO-mediated OXPHOS, mitochondrial function, and mitochondrial fusion. Inhibiting mitochondrial fusion diminished the effect of ACC1 inhibition. Reciprocally, promoting mitochondrial fusion, even in the absence of ACC1 modulation, resulted in a Treg functional and metabolic phenotype similar to ACC1 inhibition, indicating a key role for mitochondrial fusion in Treg suppressive potency. Ex vivo expanded, ACC1 inhibitor treated human Treg similarly augmented suppressor function as observed with murine Treg. Together, these data suggest that ACC1 manipulation may be exploited to modulate Treg function in patients.