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TGF-beta is important in determining the in vivo patterns of susceptibility or resistance in mice infected with Candida albicans

TGF-beta is important in determining the in vivo patterns of susceptibility or resistance in mice infected with Candida albicans

Journal of Immunology 155(3): 1349-1360

ISSN/ISBN: 0022-1767

PMID: 7636200

Resistance and susceptibility of mice to systemic infection with the fungus Candida albicans are associated with the preferential expansion of Th1 and Th2 cells, respectively. In this study, endogenous production of TGF-beta was found to be increased soon after infection of healer mice with a live vaccine strain of the fungus, but down-regulated in nonhealer mice with virulent yeast challenge. Although not affecting the outcome of primary challenge, serologic ablation of TGF-beta in the former animals abrogated development of acquired resistance and resulted in impaired production of IL-1 2/IFN-gamma and higher expression of IL-4/IL-10 at the time of reinfection with virulent yeast. A CD4+ population expressing the memory phenotype, CD44-highMEL-14-low, which appeared to be expanded by yeast infection of nonhealer mice, was similarly increased in the healer mice by anti-TGF-beta treatment. In vitro rTGF-beta impaired the candidacidal function of IFN-gamma-activated macrophages. Yet in nonhealer mice infected with virulent C. albicans, administration of rTGF-beta delayed progression of the disease, which was concomitant with the detection of lower levels of IL-4. In addition to previous evidence for an obligatory role of IFN-gamma and IL-12 in Candida-driven Th1 cell differentiation in vivo, the present data establish TGF-beta as a third cytokine, the presence of which may be required for optimal Th1 development leading to long-lived anticandidal resistance.

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Accession: 009515024

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