| SHIP negatively regulates Flt3L-derived dendritic cell generation and positively regulates MyD88-independent TLR-induced maturation. | |
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MedLine Citation:
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PMID: 20720161 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We demonstrate herein that SHIP negatively regulates the proliferation, differentiation, and survival of FL-DCs from BM precursors, as shown by a more rapid appearance and higher numbers of CD11c(+) DCs from SHIP-/- cultures as well as increased survival of mature FL-DCs in the absence of Flt3L. This increased survival, which is lost with low levels of the PI3K inhibitor, LY, correlates with an enhanced constitutive activation of the Akt pathway. Interestingly, however, these SHIP-/- FL-DCs display a less-mature phenotype after TLR ligand stimulation, as far as MHCII, CD40, and CD86 are concerned. Unexpectedly, SHIP-/- FL-DCs activated with TLR ligands, which use MyD88-independent pathways, are markedly impaired in their ability to stimulate Ag-specific T cell proliferation, and SHIP-/- FL-DCs activated by TLRs, which exclusively use the MyD88-dependent pathway, are as capable as WT FL-DCs. There is also a more pronounced T(H)1 skewing by the SHIP-/- FL-DCs than by WT FL-DCs, which is consistent with our finding that SHIP-/- FL-DCs secrete higher levels of IL-12 and TNF-α in response to LPS or dsRNA than their WT counterparts. These results suggest that SHIP negatively regulates FL-DC generation but positively regulates the maturation and function of FL-DCs induced by TLRs, which operate via MyD88-independent pathways. |
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Authors:
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Frann Antignano; Mariko Ibaraki; Jens Ruschmann; Julienne Jagdeo; Gerald Krystal |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-18 |
Journal Detail:
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Title: Journal of leukocyte biology Volume: 88 ISSN: 1938-3673 ISO Abbreviation: J. Leukoc. Biol. Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-11-02 Completed Date: 2010-11-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8405628 Medline TA: J Leukoc Biol Country: United States |
Other Details:
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Languages: eng Pagination: 925-35 Citation Subset: IM |
Affiliation:
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British Columbia Cancer Agency, 675 West 10th Avenue, Vancouver, BC, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blotting, Western Cells, Cultured Crosses, Genetic DNA Primers Dendritic Cells / cytology, immunology, physiology* Enzyme-Linked Immunosorbent Assay Female Flow Cytometry Lymphocyte Activation Male Mice Mice, Inbred C57BL Mice, Knockout Mice, Transgenic Myeloid Differentiation Factor 88 / genetics Phosphoric Monoester Hydrolases / deficiency, genetics* RNA / genetics, isolation & purification Reverse Transcriptase Polymerase Chain Reaction T-Lymphocytes / immunology |
| Chemical | |
Reg. No./Substance:
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0/DNA Primers; 0/Myd88 protein, mouse; 0/Myeloid Differentiation Factor 88; 63231-63-0/RNA; EC 3.1.3.-/Phosphoric Monoester Hydrolases; EC 3.1.3.56/inositol-1,4,5-trisphosphate 5-phosphatase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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