Abstract:
:Acquired aplastic anemia is an autoimmune-mediated bone marrow failure syndrome. The mechanism by which such an autoimmune reaction is initiated is unknown. Whether and how the genetic lesions detected in patients cause autoimmune bone marrow failure have not yet been determined. We found that mice with spontaneous deletion of the TGFβ-activated kinase-1 gene in a small subset of hematopoietic cells developed bone marrow failure which resembled the clinical manifestations of acquired aplastic anemia patients. Bone marrow failure in such mice could be reversed by depletion of CD4+ T lymphocytes or blocked by knockout of interferon-γ, suggesting a Th1-cell-mediated autoimmune mechanism. The onset and progression of bone marrow failure in such mice were significantly accelerated by the inactivation of tumor necrosis factor-α signaling. Tumor necrosis factor-α restricts autoimmune bone marrow failure by inhibiting type-1 T-cell responses and maintaining the function of myeloid-derived suppressor cells. Furthermore, we determined that necroptosis among a small subset of mutant hematopoietic cells is the cause of autoimmune bone marrow failure because such bone marrow failure can be prevented by deletion of receptor interacting protein kinase-3 Our study suggests a novel mechanism to explain the pathogenesis of autoimmune bone marrow failure.
journal_name
Haematologicajournal_title
Haematologicaauthors
Xin J,Breslin P,Wei W,Li J,Gutierrez R,Cannova J,Ni A,Ng G,Schmidt R,Chen H,Parini V,Kuo PC,Kini AR,Stiff P,Zhu J,Zhang Jdoi
10.3324/haematol.2016.151514subject
Has Abstractpub_date
2017-02-01 00:00:00pages
295-307issue
2eissn
0390-6078issn
1592-8721pii
haematol.2016.151514journal_volume
102pub_type
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