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Infection and Immunity, April 1999, p. 1659-1665, Vol. 67, No. 4
Laboratory of Host
Defenses1 and Laboratory of Parasitic
Diseases,2 National Institute of Allergy and
Infectious Diseases, National Institutes of Health, Bethesda,
Maryland 20892
Received 11 September 1998/Returned for modification 19 October
1998/Accepted 19 January 1999
Chronic granulomatous disease (CGD) is a genetic disorder of NADPH
oxidase in which phagocytes are defective in generating reactive
oxidants. CGD patients suffer from recurrent infections and exuberant
and persistent tissue granuloma formation. We hypothesized that
abnormal granulomata in CGD may result from aberrant T-cell-mediated cytokine responses. To assess Th-1-type cytokine responses and granulomata, we challenged p47phox
0019-9567/99/$04.00+0
The p47phox
/
Mouse Model of Chronic
Granulomatous Disease Has Normal Granuloma Formation and Cytokine
Responses to Mycobacterium avium and Schistosoma
mansoni Eggs
/
and
wild-type mice with avirulent (SmD) or virulent (SmT) variants of
Mycobacterium avium 2-151. To assess Th-2-type cytokine
responses and granulomata, we used Schistosoma mansoni eggs
(SME). Mononuclear cells were harvested, and cytokine responses were
determined by enzyme-linked immunosorbent assay or reverse
transcriptase PCR. Following SmD or SmT challenge, splenocytes from
p47phox
/
and wild-type mice generated
similar polar Th-1 responses (increased levels of gamma interferon and
basal levels of interleukin 4 [IL-4] and IL-5). By 8 weeks after SmT
challenge, exuberant splenic granulomata developed in
p47phox
/
and wild-type mice. After SME
challenge, thoracic lymph node mononuclear cells from
p47phox
/
and wild-type mice generated
similar mixed Th-1 and Th-2 cytokine responses to SME antigen and
concanavalin A. Peak lung granuloma sizes and rates of regression were
similar in p47phox
/
and wild-type mice.
These results suggest that exuberant granulomatous inflammation in CGD
is probably not the result of skewing of T-cell responses toward the
Th-1 or Th-2 pole. Appropriate regression of established tissue
granulomata in p47phox
/
mice challenged
with SME suggests that abnormal granuloma formation in CGD is stimulus
dependent and is not an invariant feature of the disease.
*
Corresponding author. Mailing address: Laboratory of
Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 10 Center Dr., Dr. MSc. 1886, Bethesda, MD 20892. Phone: (301) 402-7684. Fax: (301) 402-4369. E-mail: smh{at}nih.gov.
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