Linked Life Data

21190989

Source:http://linkedlifedata.com/resource/pubmed/id/21190989

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2011-2-25
pubmed:abstractText
CD8-positive/T-cell receptor-negative (CD8(+)/TCR(-)) graft facilitating cells (FCs) are a novel cell population in bone marrow that potently enhance engraftment of hemopoietic stem cells (HSCs). Previously, we showed that the CD11c(+)/B220(+)/CD11b(-) plasmacytoid-precursor dendritic cell (p-preDC) FC subpopulation plays a critical but nonredundant role in facilitation. In the present study, we investigated the mechanism of FC function. We report that FCs induce antigen-specific CD4(+)/CD25(+)/FoxP3(+) regulatory T cells (Tregs) in vivo. The majority of chimeric Tregs were recipient derived. Chimeric Tregs harvested at ? 4 weeks after transplantation significantly enhanced engraftment of donor- and recipient-derived HSCs, but not third-party HSCs, in conditioned secondary recipients, demonstrating antigen specificity. Although Tregs were present 2 and 3 weeks after transplantation, they did not enhance engraftment. In contrast, week 5 and greater Tregs potently enhanced engraftment. The function of chimeric Tregs was directly correlated with the development of FoxP3 expression. Chimeric Tregs also induced significantly stronger suppression of T-cell proliferation to donor antigen in vitro. Removal of p-preDC FCs resulted in impaired engraftment of allogeneic HSCs and failure to produce chimeric Tregs, suggesting that the CD8?(+) p-preDC subpopulation is critical in the mechanism of facilitation. These data suggest that FCs induce the production of antigen-specific Tregs in vivo, which potently enhance engraftment of allogeneic HSCs. FCs hold clinical potential because of their ability to remain tolerogenic in vivo.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1528-0020
pubmed:author
pubmed:issnType
Electronic
pubmed:day
24
pubmed:volume
117
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2494-505
pubmed:dateRevised
2011-5-16
pubmed:meshHeading
pubmed:year
2011
pubmed:articleTitle
CD8α+ plasmacytoid precursor DCs induce antigen-specific regulatory T cells that enhance HSC engraftment in vivo.
pubmed:affiliation
Institute for Cellular Therapeutics, University of Louisville, 570 S Preston St., Louisville, KY 40202, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural