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1996-03-09
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Document 0218
DOCN M9650218
TI Interferon-gamma (IFN-gamma) treatment decreases the inflammatory
response in chronic Pseudomonas aeruginosa pneumonia in rats.
DT 9605
AU Johansen HK; Hougen HP; Rygaard J; Hoiby N; Department of Clinical
Microbiology, Rigshospitalet, Copenhagen,; Denmark.
SO Clin Exp Immunol. 1996 Feb;103(2):212-8. Unique Identifier : AIDSLINE
MED/96152667
AB In a rat model of chronic Pseudomonas aeruginosa lung infection
mimicking cystic fibrosis (CF), we studied whether the inflammatory
response could be altered by intraperitoneal treatment with recombinant
rat interferon-gamma (rrIFN-gamma). Rats were treated either before or
after intratracheal challenge with P. aeruginosa embedded in alginate
beads. Rats treated after challenge had a significant reduction in the
severity of macroscopic lung inflammation compared with rats treated
before challenge (P = 0.004) and controls (P = 0.003). The
histopathology in controls was dominated by numerous polymorphonuclear
leucocytes (PMN) (> or = 90%) surrounding the alginate beads like in CF.
This could be caused by a Th2-like response. In contrast, a complete
shift to a chronic-type inflammation dominated by mononuclear leucocytes
(> or = 90% lymphocytes and plasma cells) and granulomas was observed in
both rrIFN-gamma-treated groups of rats. This could be caused by a
Th1-like response. There was no significant difference in lethality
between the groups, and the antibody titres against P. aeruginosa
sonicate and alginate were similar in the treated rats and controls.
Since the ongoing lung tissue damage in CF patients has been shown to be
caused by elastase secreted by PMN, which dominate the P. aeruginosa
lung infection, our findings offer a possible new strategy of modifying
the inflammatory response in CF patients.
DE Animal Cystic Fibrosis/IMMUNOLOGY/PATHOLOGY/THERAPY Disease Models,
Animal Female Inflammation/*THERAPY Interferon-gamma,
Recombinant/*THERAPEUTIC USE Pneumonia,
Bacterial/IMMUNOLOGY/PATHOLOGY/*THERAPY Pseudomonas
Infections/IMMUNOLOGY/PATHOLOGY/*THERAPY Rats Rats, Inbred Lew
Support, Non-U.S. Gov't Th1 Cells/IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).