Linked Life Data

20581314

Source:http://linkedlifedata.com/resource/pubmed/id/20581314

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
2010-10-8
pubmed:abstractText
Invariant NKT (iNKT) cells are an innate type of T cells, which respond rapidly on activation. iNKT cells acquire these innate-like abilities during development; however, the signals driving development and functional maturation remain only partially understood. Because interleukin-15 (IL-15) is crucial for iNKT development and is delivered by transpresentation, we set out to identify the cell types providing IL-15 to developing iNKT cells and determine their role at the various states of development and maturation. We report here that transpresentation of IL-15 by parenchymal cells was crucial for generating normal number of iNKTs in the thymus, whereas both hematopoietic and parenchymal cells regulated iNKT cell numbers in the periphery, particularly in the liver. Specifically, dendritic cells contributed to peripheral iNKT cell numbers by up-regulating Bcl-2 expression and promoting extrathymic iNKT cell ex-pansion and their homeostatic proliferation. Whether IL-15 affects functional maturation of iNKT cells was also examined. In IL-15R?(-/-) mice, CD44(High)NK1.1(+) iNKT cells displayed decreased T-bet expression and in response to ?-galactosylceramide, had deficient interferon-? expression. Such defects could be reversed by exogenous IL-15 signals. Overall, these studies identify stage-specific functions of IL-15, which are determined by the tissue microenvironment and elucidate the importance of IL-15 in functional maturation.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1528-0020
pubmed:author
pubmed:issnType
Electronic
pubmed:day
7
pubmed:volume
116
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2494-503
pubmed:dateRevised
2011-10-7
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Thymic and peripheral microenvironments differentially mediate development and maturation of iNKT cells by IL-15 transpresentation.
pubmed:affiliation
Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural