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1996-03-09
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Document 0090
DOCN M9650090
TI Sequential involvement of NK cells and CD8+ T cells in granuloma
formation of Rhodococcus aurantiacus-infected mice.
DT 9605
AU Asano M; Nakane A; Kohanawa M; Minagawa T; Department of Microbiology,
Hokkaido University School of; Medicine, Japan.
SO Microbiol Immunol. 1995;39(7):499-507. Unique Identifier : AIDSLINE
MED/96025420
AB We investigated the effect of in vivo administration of antibodies
against T-cell subsets and natural killer (NK) cells on endogenous gamma
interferon (IFN-gamma) production and granuloma formation in Rhodococcus
aurantiacus-infected mice. High titers of endogenous IFN-gamma were
detected in the extracts of the livers and spleens during 24 hr of the
infection, reaching the peak at 8 hr, and the IFN-gamma production was
reduced by in vivo administration of anti-NK 1.1 monoclonal antibody
(MAb) or antibody against asialo GM1+ cells. Endogenous IFN-gamma
declined until 2 days of the infection, then reappeared from 1 week and
peaked at 3 weeks. Endogenous IFN-gamma at 1 and 3 weeks was reduced by
in vivo administration of anti-CD8 MAb, but not by anti-CD4 MAb or
anti-NK 1.1 MAb. Granulomatous lesions in the livers and spleens began
to appear from 1 week of the infection and developed in 3 weeks. In vivo
administration of rat anti-IFN-gamma MAb reduced the development of
granulomas. In addition, granuloma formation was reduced by depletion of
NK cells prior to the infection or depletion of CD8+ T cells at 1 week
of the infection. Based on these findings, it is presumed that the
biphasic production of IFN-gamma is attributable to NK cells in the
early phase of the infection and CD8+ T cells in the phase of granuloma
formation, and that granuloma formation is regulated by NK cells and
CD8+ T cells through the secretion of endogenous IFN-gamma.
DE Actinomycetales Infections/*COMPLICATIONS Animal Antibodies,
Monoclonal/PHARMACOLOGY Colony Count, Microbial CD4-Positive
T-Lymphocytes/PHYSIOLOGY CD8-Positive T-Lymphocytes/*PHYSIOLOGY Female
Granuloma/*ETIOLOGY/PATHOLOGY Interferon Type
II/BIOSYNTHESIS/IMMUNOLOGY Killer Cells, Natural/*PHYSIOLOGY
Liver/METABOLISM/MICROBIOLOGY Liver Diseases/*ETIOLOGY/PATHOLOGY
Lymphocyte Depletion Mice Mice, Inbred C57BL *Rhodococcus
Spleen/METABOLISM/MICROBIOLOGY Splenic Diseases/*ETIOLOGY/PATHOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).