Title |
Distinct Tumor Necrosis Factor Alpha Receptors Dictate Stem Cell Fitness Versus Lineage Output in Dnmt3a-Mutant Clonal Hematopoiesis
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Published in |
Cancer Discovery, September 2022
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DOI | 10.1158/2159-8290.cd-22-0086 |
Pubmed ID | |
Authors |
Jennifer M. SanMiguel, Elizabeth Eudy, Matthew A. Loberg, Kira A. Young, Jayna J. Mistry, Kristina D. Mujica, Logan S. Schwartz, Timothy M. Stearns, Grant A. Challen, Jennifer J. Trowbridge |
Abstract |
Clonal hematopoiesis resulting from enhanced fitness of mutant hematopoietic stem cells (HSCs) associates with both favorable and unfavorable health outcomes related to the types of mature mutant blood cells produced, but how this lineage output is regulated is unclear. Using a mouse model of a clonal hematopoiesis-associated mutation, DNMT3AR882/+ (Dnmt3aR878H/+), aging-induced TNFα signaling was found to promote the selective advantage of mutant HSCs and stimulate production of mutant B lymphoid cells. Genetic loss of TNFα receptor TNFR1 ablated the selective advantage of mutant HSCs without altering their lineage output, while loss of TNFR2 resulted in overproduction of mutant myeloid cells without altering HSC fitness. These results nominate TNFR1 as a target to reduce clonal hematopoiesis and risk of associated diseases, and support a model wherein clone size and mature blood lineage production can be independently controlled to modulate favorable and unfavorable CH outcomes. |
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