Necroptosis in spontaneously-mutated hematopoietic cells induces autoimmune bone marrow failure in mice.

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

Haematologica

journal_title

Haematologica

authors

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 J

doi

10.3324/haematol.2016.151514

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

295-307

issue

2

eissn

0390-6078

issn

1592-8721

pii

haematol.2016.151514

journal_volume

102

pub_type

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