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1994-08-27
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Document 0717
DOCN M9480717
TI Experimental murine pulmonary cryptococcosis. Differences in pulmonary
inflammation and lymphocyte recruitment induced by two encapsulated
strains of Cryptococcus neoformans.
DT 9410
AU Curtis JL; Huffnagle GB; Chen GH; Warnock ML; Gyetko MR; McDonald RA;
Scott PJ; Toews GB; Pulmonary Section, Department of Veterans Affairs
Medical Center,; Ann Arbor, MI.
SO Lab Invest. 1994 Jul;71(1):113-26. Unique Identifier : AIDSLINE
MED/94315861
AB BACKGROUND: Cryptococcus neoformans, the most common cause of lethal
mycosis in AIDS, usually causes only subclinical pneumonitis in normal
hosts. However, cryptococcosis can induce various pulmonary inflammatory
reactions, and pulmonary cellular immunity is postulated to prevent
dissemination. We hypothesized that cryptococcal strains possess
different capacities to induce recruitment to the lungs of inflammatory
cells, especially lymphocytes, which are necessary for cryptococcal
clearance. EXPERIMENTAL DESIGN: We examined the pulmonary response of
CBA/J mice to intratracheal inoculation with C. neoformans of either of
two strains: 52D (ATCC 24067), which rarely kills immunocompetent mice;
and 145A (ATCC 62070), which is uniformly fatal. From 2-42 days after
inoculation, lungs were either examined grossly and microscopically or
were enzymatically digested and inflammatory cells counted and analyzed
by flow cytometry. At 42 days, organism burden in lung and brain was
quantified by colony-forming unit assay. RESULTS: Pulmonary inflammation
differed greatly between the two strains. Strain 52D induced dense
perivascular and alveolar inflammation; infection progressed to day 21
and then waned. In contrast, strain 145A induced delayed, meager
lymphocytic infiltration and slight alveolitis; organisms grew
progressively. Recovery of inflammatory cells increased by day 13 with
strain 52D, but not until day 31 with strain 145A. Although all
lymphocyte subsets were greater in 52D infection, the disparity was
greatest for CD4+ T cells. Nevertheless, lymphocytes from paratracheal
nodes of infected mice proliferated in vitro to heat-killed cryptococci,
indicating immune recognition of both strains. At day 42, strain 52D
lightly infected lungs but not brain, whereas strain 145A heavily
infected lungs and brain. CONCLUSIONS; Cryptococcal strains differ in
their capacity to induce pulmonary cellular inflammation, especially
CD4+ T cell recruitment. Our results suggest that strain-specific
difference in the organism's ability to induce (or evade) pulmonary
inflammation contributes to the outcome of infection.
DE Animal Brain/MICROBIOLOGY Cell Movement
*Cryptococcosis/MICROBIOLOGY/PATHOLOGY *Cryptococcus
neoformans/ISOLATION & PURIF Flow Cytometry Immunity
Lung/MICROBIOLOGY/*PATHOLOGY Lymphocytes/*PHYSIOLOGY Mice Mice,
Inbred CBA Phenotype Pneumonia/*MICROBIOLOGY/PATHOLOGY Support,
Non-U.S. Gov't Support, U.S. Gov't, Non-P.H.S. Support, U.S. Gov't,
P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).