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Loss of GADD34 induces early age-dependent deviation to the myeloid lineage.
MedLine Citation:
PMID:  24247289     Owner:  NLM     Status:  Publisher    
Hematopoietic stem cells (HSCs) generate all known hematopoietic lineages and are capable of self-renewal. Upon aging, myeloid-biased HSCs are maintained, whereas lymphoid-biased HSCs are lost. GADD34 protein is expressed in myeloid-lineage cells and has been cloned from them. However, the function of GADD34 in the myeloid lineage has not yet been elucidated. Here, we show that early age-dependent deviation to the myeloid lineage occurs in GADD34-deficient mice. Early increases of GR-1(int)CD11b(+) and GR-1(high)CD11b(+) neutrophils were observed in the spleen, bone marrow (BM) and blood of GADD34-deficient mice. We found that BM Lin(-) c-Kit(+) Sca1(+) and Lin(-) c-Kit(+) Sca1(-)cells expressed GADD34 protein without stimulation and increased GADD34 expression following intravenous injection of Staphylococcus aureus (S.aureus). These cell populations were high in GADD34-deficient BM and were increased by the injection of S. aureus. Because of the increase in granulocyte colony-stimulating factor (G-CSF) induced by S. aureus injection, we examined the signaling pathway from the G-CSF receptor (G-CSFR). We found that phosphorylation of signal transducer and activator of transcription factor 3 was highly increased in GADD34-deficient Lin(-) BM cells by the stimulation of G-CSF. These results indicate that GADD34 binds to Lyn and inhibit G-CSFR signaling. We show here that GADD34 works to inhibit the proliferation and differentiation of HSCs or myeloid precursor cells and maintains homeostatic differentiation of neutrophil-lineage cells to avoid early immunological senescence.Immunology and Cell Biology advance online publication, 19 November 2013; doi:10.1038/icb.2013.78.
Naomi Nishio; Sachiko Ito; Ken-Ichi Isobe
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-11-19
Journal Detail:
Title:  Immunology and cell biology     Volume:  -     ISSN:  1440-1711     ISO Abbreviation:  Immunol. Cell Biol.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8706300     Medline TA:  Immunol Cell Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Immunology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
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