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M9550815.TXT
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1995-03-25
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Document 0815
DOCN M9550815
TI CD8 T-cell clones producing interleukin-5 and interferon-gamma in
bronchial mucosa of patients with asthma induced by toluene
diisocyanate.
DT 9505
AU Maestrelli P; Del Prete GF; De Carli M; D'Elios MM; Saetta M; Di Stefano
A; Mapp CE; Romagnani S; Fabbri LM; Institute of Occupational Medicine,
University of Padova, Italy.
SO Scand J Work Environ Health. 1994 Oct;20(5):376-81. Unique Identifier :
AIDSLINE MED/95167457
AB OBJECTIVES--The aims of the present study were to determine whether
specific in vivo stimulation of asthmatics sensitized with toluene
diisocyanate (TDI) induces the activation of T lymphocytes in bronchial
mucosa and to characterize their phenotype and cytokine secretion
profile. METHODS--Bronchial biopsies from two subjects with occupational
asthma due to TDI were obtained 48 h after an asthmatic reaction induced
by an inhalation challenge with TDI and after three months of no
exposure to TDI, at the time when the subjects had recovered from their
asthma. The fragments of bronchial mucosa were cultured in the presence
of interleukin-2 so that the in vivo activated T cells present in the
tissue would expand, and T blasts were then cloned under limiting
dilution conditions. RESULTS--From the two 48-h specimens, 65 and 63
T-cell clones were obtained. Most of the clones exhibited the CD8
phenotype (82 and 83%). All of the CD8 clones produced interferon-gamma
and 44% produced interleukin-5, but only 6% secreted interleukin-4 as
well. Three months after the cessation of exposure, growing T cells
could not be recovered from bronchial biopsies cultured in
interleukin-2. CONCLUSIONS--The results suggest that, in sensitized
subjects, exposure to TDI induces the activation of a subset of CD8
lymphocytes producing interferon-gamma and interleukin-5.
DE Adult Asthma/CHEMICALLY INDUCED/*IMMUNOLOGY Biopsy Bronchi/CYTOLOGY
Bronchial Provocation Tests Case-Control Studies Cells, Cultured
Clone Cells CD8-Positive T-Lymphocytes/*SECRETION Human
Immunophenotyping Interferon Type II/*SECRETION
Interleukin-5/*SECRETION Lymphocyte Transformation Male Middle Age
Mucous Membrane/CYTOLOGY Occupational Diseases/CHEMICALLY
INDUCED/*IMMUNOLOGY Support, Non-U.S. Gov't Toluene
2,4-Diisocyanate/*ADVERSE EFFECTS/DIAGNOSTIC USE JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).