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1996-02-26
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Document 0471
DOCN M9620471
TI Interleukin 12 inhibits antigen-induced airway hyperresponsiveness,
inflammation, and Th2 cytokine expression in mice.
DT 9602
AU Gavett SH; O'Hearn DJ; Li X; Huang SK; Finkelman FD; Wills-Karp M;
Department of Environmental Health Sciences, Johns Hopkins; University,
Baltimore, Maryland 21205, USA.
SO J Exp Med. 1995 Nov 1;182(5):1527-36. Unique Identifier : AIDSLINE
MED/96042149
AB Allergic asthma is characterized by airway hyperresponsiveness and
pulmonary eosinophilia, and may be mediated by T helper (Th) lymphocytes
expressing a Th2 cytokine pattern. Interleukin (IL) 12 suppresses the
expression of Th2 cytokines and their associated responses, including
eosinophilia, serum immunoglobulin E, and mucosal mastocytosis. We have
previously shown in a murine model that antigen-induced increases in
airway hyperresponsiveness and pulmonary eosinophilia are CD4+ T cell
dependent. We used this model to determine the ability of IL-12 to
prevent antigen-induced increases in airway hyperresponsiveness,
bronchoalveolar lavage (BAL) eosinophils, and lung Th2 cytokine
expression. Sensitized A/J mice developed airway hyperresponsiveness and
increased numbers of BAL eosinophils and other inflammatory cells after
single or repeated intratracheal challenges with sheep red blood cell
antigen. Pulmonary mRNA and protein levels of the Th2 cytokines IL-4 and
IL-5 were increased after antigen challenge. Administration of IL-12 (1
microgram/d x 5 d) at the time of a single antigen challenge abolished
the airway hyperresponsiveness and pulmonary eosinophilia and promoted
an increase in interferon (IFN) gamma and decreases in IL-4 and IL-5
expression. The effects of IL-12 were partially dependent on IFN-gamma,
because concurrent treatment with IL-12 and anti-IFN-gamma monoclonal
antibody partially reversed the inhibition of airway hyperresponsiveness
and eosinophilia by IL-12. Treatment of mice with IL-12 at the time of a
second antigen challenge also prevented airway hyperresponsiveness and
significantly reduced numbers of BAL inflammatory cells, reflecting the
ability of IL-12 to inhibit responses associated with ongoing
antigen-induced pulmonary inflammation. These data show that
antigen-induced airway hyperresponsiveness and inflammation can be
blocked by IL-12, which suppresses Th2 cytokine expression. Local
administration of IL-12 may provide a novel immunotherapy for the
treatment of pulmonary allergic disorders such as atopic asthma.
DE Animal Antigens/IMMUNOLOGY/TOXICITY Asthma Biological Response
Modifiers/PHARMACOLOGY/*THERAPEUTIC USE Bronchial
Hyperreactivity/IMMUNOLOGY/*PREVENTION & CONTROL Bronchoalveolar Lavage
Fluid/CYTOLOGY Disease Models, Animal
Eosinophilia/IMMUNOLOGY/*PREVENTION & CONTROL Erythrocytes/IMMUNOLOGY
Gene Expression Regulation/*DRUG EFFECTS Inflammation Interferon Type
II/PHYSIOLOGY Interleukin-12/PHARMACOLOGY/*THERAPEUTIC USE
Interleukin-4/*BIOSYNTHESIS/GENETICS/SECRETION
Interleukin-5/*BIOSYNTHESIS/GENETICS/SECRETION
Lung/*IMMUNOLOGY/METABOLISM/PATHOLOGY Male Mice Mice, Inbred A
Respiratory Hypersensitivity/IMMUNOLOGY/*THERAPY Sheep/BLOOD Support,
U.S. Gov't, Non-P.H.S. Support, U.S. Gov't, P.H.S. Th2
Cells/*SECRETION JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).