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1996-01-30
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Document 0761
DOCN M9610761
TI Early cytokine production in pulmonary Cryptococcus neoformans
infections distinguishes susceptible and resistant mice.
DT 9601
AU Hoag KA; Street NE; Huffnagle GB; Lipscomb MF; Department of
Microbiology, University of Texas Southwestern; Medical Center, Dallas
75235-8576, USA.
SO Am J Respir Cell Mol Biol. 1995 Oct;13(4):487-95. Unique Identifier :
AIDSLINE MED/96025070
AB A murine pulmonary infection model utilizing intratracheal inoculation
of Cryptococcus neoformans was used to analyze cytokines produced in
response to opportunistic pathogens acquired via the respiratory tract.
The specific question asked was whether early cytokine secretion in
lung-associated lymph nodes (LALN) would predict whether this organism
would be cleared from the lung. Lung colony-forming units (CFU) were
analyzed in two strains of mice over 12 wk, and lung clearance was found
to be strain dependent. C.B-17 mice reduced their lung CFU burden
between day 7 and day 14 of infection, had significantly higher in lung
CFU than C.B-17 mice. The capacity of cells from lungs and LALN to
secrete cytokines was significantly different between the strains when
assessed at day 7 and day 14 after inoculation. When compared with
sensitive C57BL/6 mice 7 days after infection, resistant C.B-17 mice
demonstrated (1) increased interferon-gamma secretion by LALN cells in
vitro in response to media alone, heat-killed cryptococci, and the T
cell mitogen concanavalin A and (2) increased interleukin (IL)-2
secretion by both LALN and lung cells in response to concanavalin A.
IL-4 and IL-10 were comparable or undetectable in both mouse strains,
whereas IL-5 was significantly higher in all lung cell cultures of
C57BL/6 mice. Thus, an early regional Th1 immune response in C.B-17 mice
correlated with resistance to the organism, whereas the absence of this
response in C57BL/6 mice correlated with susceptibility.
DE Animal Antigens, Fungal/IMMUNOLOGY Cells, Cultured Comparative Study
Concanavalin A/PHARMACOLOGY Cryptococcosis/*IMMUNOLOGY/MICROBIOLOGY
Cryptococcus/GROWTH & DEVELOPMENT/*IMMUNOLOGY CD4 Lymphocyte Count
Disease Susceptibility Female Immunity, Natural Interferon Type
II/*BIOSYNTHESIS Interleukins/*BIOSYNTHESIS
Lung/*IMMUNOLOGY/MICROBIOLOGY Lung Diseases,
Fungal/*IMMUNOLOGY/MICROBIOLOGY Lymph Nodes/IMMUNOLOGY Lymphocyte
Transformation Mice Mice, Inbred BALB C Mice, Inbred C57BL Species
Specificity Spleen/IMMUNOLOGY 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).