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ZIRC
ZFIN ID: ZDB-PUB-141002-3
TNF-mediated inflammation represses GATA1 and activates p38 MAP kinase in RPS19-deficient hematopoietic progenitors
Bibikova, E., Youn, M.Y., Danilova, N., Ono-Uruga, Y., Konto-Ghiorghi, Y., Ochoa, R., Narla, A., Glader, B., Lin, S., Sakamoto, K.M.
Date: 2014
Source: Blood   124(25): 3791-8 (Journal)
Registered Authors: Danilova, Nadia, Lin, Shuo
Keywords: none
MeSH Terms:
  • Animals
  • Blotting, Western
  • Cells, Cultured
  • Embryo, Nonmammalian/embryology
  • Embryo, Nonmammalian/metabolism
  • Enzyme Activation
  • Erythroid Cells/metabolism
  • Erythropoiesis/drug effects
  • Erythropoiesis/genetics
  • Etanercept
  • GATA1 Transcription Factor/genetics
  • GATA1 Transcription Factor/metabolism*
  • Gene Expression
  • Hematopoietic Stem Cells/metabolism*
  • Humans
  • Immunoglobulin G/pharmacology
  • Inflammation/genetics
  • Inflammation/metabolism*
  • RNA Interference
  • Receptors, Tumor Necrosis Factor
  • Reverse Transcriptase Polymerase Chain Reaction
  • Ribosomal Proteins/genetics
  • Ribosomal Proteins/metabolism*
  • Tumor Necrosis Factor-alpha/genetics
  • Tumor Necrosis Factor-alpha/metabolism*
  • Tumor Suppressor Protein p53/genetics
  • Tumor Suppressor Protein p53/metabolism
  • Zebrafish/embryology
  • Zebrafish/genetics
  • Zebrafish/metabolism
  • p38 Mitogen-Activated Protein Kinases/genetics
  • p38 Mitogen-Activated Protein Kinases/metabolism*
PubMed: 25270909 Full text @ Blood
FIGURES
ABSTRACT
Diamond-Blackfan Anemia (DBA) is an inherited disorder, characterized by defects in erythropoiesis, congenital abnormalities, and predisposition to cancer. Approximately 25% of DBA patients have a mutation in RPS19, which encodes a component of the 40S ribosomal subunit. Upregulation of p53 contributes to the pathogenesis of DBA, but the link between ribosomal protein mutations and erythropoietic defects is not well understood. We found that RPS19 deficiency in hematopoietic progenitor cells leads to decreased GATA1 expression in the erythroid progenitor population and p53-dependent upregulation of TNF-α in non-erythroid cells. The decrease in GATA1 expression was mediated, at least in part, by activation of p38 MAPK in erythroid cells and rescued by inhibition of TNF-α or p53. The anemia phenotype in RPS19 deficient zebrafish was reversed by treatment with the TNF-α inhibitor etanercept. Our data reveal that RPS19 deficiency leads to inflammation, p53-dependent increase in TNF-α, activation of p38 MAPK, and decreased GATA1 expression, suggesting a novel mechanism for the erythroid defects observed in DBA.
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