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TGF-? Inhibition Rescues Hematopoietic Stem Cell Defects and Bone Marrow Failure in Fanconi Anemia #MMPMID27053300
Zhang H; Kozono DE; O?Connor KW; Vidal-Cardenas S; Rousseau A; Hamilton A; Moreau L; Gaudiano EF; Greenberger J; Bagby G; Soulier J; Grompe M; Parmar K; D?Andrea AD
Cell Stem Cell 2016[May]; 18 (5): 668-81 PMID27053300show ga
Fanconi Anemia (FA) is an inherited DNA repair disorder characterized by progressive bone marrow failure (BMF) from hematopoietic stem and progenitor cell (HSPC) attrition. A greater understanding of the pathogenesis of BMF could improve the therapeutic options for FA patients. Using a genome-wide shRNA screen in human FA fibroblasts, we identify transforming growth factor-? (TGF-?) pathway-mediated growth suppression as a cause of BMF in FA. Blocking the TGF-? pathway improves the survival of FA cells and rescues the proliferative and functional defects of HSPCs derived from FA mice and FA patients. Inhibition of TGF-? signaling in FA HSPCs results in elevated homologous recombination (HR) repair with a concomitant decrease in non-homologous end-joining (NHEJ), accounting for the improvement in cellular growth. Together, our results suggest that elevated TGF-? signaling contributes to the BMF in FA by impairing HSPC function, and may be a potential therapeutic target for the treatment of FA.