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1996-03-09
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Document 0250
DOCN M9650250
TI Inflammatory and T-cell profile of asthmatic airways 6 hours after local
allergen provocation.
DT 9605
AU Gratziou C; Carroll M; Montefort S; Teran L; Howarth PH; Holgate ST;
University Medicine, Southampton General Hospital, United; Kingdom.
SO Am J Respir Crit Care Med. 1996 Feb;153(2):515-20. Unique Identifier :
AIDSLINE MED/96160556
AB T cells in the airways are considered to play a key role in
orchestrating the inflammatory response of asthma through the
elaboration of specific cytokines. Using flow cytometry we have
investigated the T-cell response of sensitized asthmatic airways 6 h
after local allergen provocation. Twelve subjects with atopic asthma
underwent bronchoalveolar lavage (BAL) before and 6 h after local
instillation of allergen into the right middle lobe (RML) and saline
into the right upper lobe (RUL). Allergen challenge produced a
significant 26% fall in FEV1, an increase in eosinophils in BAL at 6 h,
and at 24 h an increase in methacholine responsiveness compatible with
late-phase airway inflammation. When compared with saline challenge,
allergen produced an overall decrease in the number of BAL lymphocytes
from 21.3 +/- 2.8% to 16.0 +/- 3.08% of total cells but no change in the
proportion of CD4+, CD8+, CD25+, or HLA-DR+ cells. Allergen provocation
reduced the proportion of T cells expressing the beta 2 integrin
lymphocyte functional antigen-1 (LFA-1) from 72.5 +/- 30 to 43.9 +/- 9.1
mean fluorescent units (p < 0.01) and a similar trend in intercellular
adhesion molecule-1 (ICAM-1) (p = 0.08). These results indicate that
late-phase inflammatory events 6 h after local allergen provocation
involve the selective retention of airway T cells expressing specific
cell adhesion molecules.
DE Adult *Allergens Antigens, CD/ANALYSIS
Asthma/*IMMUNOLOGY/PATHOLOGY/PHYSIOPATHOLOGY
Bronchi/*IMMUNOLOGY/PATHOLOGY Bronchial Provocation Tests
Bronchoalveolar Lavage Fluid/IMMUNOLOGY Bronchoscopy Cell Count CD4
Lymphocyte Count CD8-Positive T-Lymphocytes Female Flow Cytometry
Forced Expiratory Volume Human HLA-DR Antigens/ANALYSIS Inflammation
Intercellular Adhesion Molecule-1/METABOLISM Lymphocyte Count Male
Support, Non-U.S. Gov't *T-Lymphocyte Subsets T-Lymphocytes/METABOLISM
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).