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- Document 0531
- DOCN M9620531
- TI IL-7 stimulates protective immunity in mice against the intracellular
- pathogen, Toxoplasma gondii.
- DT 9602
- AU Kasper LH; Matsuura T; Khan IA; Department of Medicine, Dartmouth
- Medical School, Hanover, NH; 03755, USA.
- SO J Immunol. 1995 Nov 15;155(10):4798-804. Unique Identifier : AIDSLINE
- MED/96062298
- AB Cytokines, in particular IFN-gamma and IL-12, are important in host
- protection against infection with Toxoplasma gondii. This parasite is a
- major cause of congenital infection and morbidity in immunosuppressed
- persons, especially those with AIDS. IL-7, a monomeric protein produced
- by bone marrow stromal cells and fetal thymus, is able to induce the
- proliferation of pro-B cells and CD4+ and CD8+ T cells, and to enhance
- cytotoxicity of CTL and NK cells. Inbred mice were infected with a
- lethal dose of T. gondii and given IL-7 twice daily. Mice treated with
- IL-7 beginning at the time of infection survived, whereas mice either
- treated after infection or not treated died. Phenotypic analysis of
- splenocytes identified an expansion of NK (asialo GM1+) cells and CD8+ T
- cell populations. In vivo depletion of NK (asialo GM1+) and CD8+ T cells
- showed that cells expressing these phenotypes were important for
- maintaining protection against the parasite. IFN-gamma depletion
- resulted in complete reversal of the protective effect of IL-7
- administration. In vivo depletion of endogenous IL-7 enhanced
- susceptibility to infection. Cytokine analysis by semiquantitative
- reverse-transcriptase PCR showed that IL-7 enhances the IFN-gamma
- response and furthermore reverses the parasite-mediated down-regulatory
- response on IL-2. These observations indicate that exogenous
- administration of human rIL-7 is able to protect mice against acute
- parasite challenge by stimulating IFN-gamma production and augmenting
- the CD8+ T cell-mediated CTL response.
- DE Animal CD8-Positive T-Lymphocytes/*IMMUNOLOGY Female Human
- *Immunity, Cellular/DRUG EFFECTS Interferon Type II/IMMUNOLOGY
- Interleukin-7/*ADMINISTRATION & DOSAGE Mice Recombinant
- Proteins/ADMINISTRATION & DOSAGE Spleen/IMMUNOLOGY Support, U.S.
- Gov't, P.H.S. Toxoplasma/*IMMUNOLOGY Toxoplasmosis, Animal/DRUG
- THERAPY/*IMMUNOLOGY JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-