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. 1997 Jul;65(7):2564–2569. doi: 10.1128/iai.65.7.2564-2569.1997

Intrapulmonary response to Histoplasma capsulatum in gamma interferon knockout mice.

R Allendoerfer 1, G S Deepe Jr 1
PMCID: PMC175362  PMID: 9199420

Abstract

We examined the immunobiological responses to Histoplasma capsulatum in lungs of gamma interferon (IFN-gamma) knockout mice (GKO mice). Naive GKO mice succumbed by day 9 to intranasal challenge with 2.5 x 10(6) yeasts, whereas all wild-type (WT) mice survived for 45 days. Compared to lungs of WT mice, the lungs of acutely infected GKO mice exhibited dramatically elevated numbers of CFU in lungs and significantly higher levels of tumor necrosis factor alpha (TNF-alpha) and granulocyte-macrophage colony-stimulating factor (GM-CSF) but not interleukin-12 (IL-12) or IL-4. To determine if IFN-gamma is necessary in reexposure histoplasmosis, GKO and WT mice were inoculated with 10(4) yeasts intranasally and given amphotericin B for 3 weeks. Six weeks later, mice were rechallenged with 2.5 x 10(6) yeasts. All GKO mice died by day 6, whereas all WT mice survived for 45 days. Lungs of GKO mice contained substantially elevated numbers of CFU and higher TNF-alpha and GM-CSF levels but not IL-12 or IL-4. Thus, IFN-gamma is requisite for control of pulmonary histoplasmosis in naive and reexposed mice.

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Selected References

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