Linked Life Data

8473745

Source:http://linkedlifedata.com/resource/pubmed/id/8473745

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1993-5-20
pubmed:abstractText
Spleen cells from scid mice produce high levels of IFN-gamma when exposed to either live tachyzoites of Toxoplasma gondii or a soluble parasite extract. Small numbers of parasites are sufficient to stimulate this response, which is also induced by cell-free supernatants of cultured tachyzoites. The parasite molecules responsible for triggering IFN-gamma production are heat-labile but resistant to freezing and thawing. Depletion of NK cells or adherent cells from the splenocyte population abolishes the response. Moreover, cultured bone marrow-derived NK cells are stimulated by Toxoplasma to produce IFN-gamma, but only when supplemented with adherent peritoneal washout or thioglycollate-induced exudate cells. Supernatants of macrophages preincubated with T. gondii extract also induce IFN-gamma synthesis by cultured NK cells. Addition of neutralizing mAb against TNF-alpha abolishes the IFN-gamma response of scid spleen cells exposed to the parasite or of NK cells incubated with supernatants of adherent cells stimulated with T. gondii extract. Moreover, splenic adherent cells produce low levels of TNF-alpha in response to the parasite. Nevertheless, TNF-alpha alone is not sufficient to trigger IFN-gamma production from purified NK cell populations. These findings provide the first example of the stimulation of T-independent IFN-gamma production by a protozoan. The ability of T. gondii to trigger this pathway may underlie its induction of strong IFN-gamma-dependent nonspecific and specific cell-mediated immunity.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-1767
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
150
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3982-9
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Toxoplasma gondii induces a T-independent IFN-gamma response in natural killer cells that requires both adherent accessory cells and tumor necrosis factor-alpha.
pubmed:affiliation
Immunology and Cell Biology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.
pubmed:publicationType
Journal Article