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Different clinical parameters which included cell-mediated immune (CMI) response, were evaluated in a model of disseminated cryptococcosis in rats. The experimental animals were pretreated four days prior to their exposure to Cryptococcus neoformans var. grubii with either heat killed cells of this yeastlike pathogen (HKC) or capsular polysaccharide (CPS) emulsified in complete Freund adjuvant (CFA). Rats treated with HKC-CFA and intraperitoneally infected with C. neoformans var. grubii had significantly better clearance of yeasts from tissues, a lower concentration of the cryptococcal capsular polysaccharide, glucuronoxylomannan (GXM), in serum and tissues, and better histopathological parameters compared to unpretreated infected rats. In contrast, rats treated with CPS-CFA presented an exacerbation of infection with a significantly higher fungal burden in tissues, a higher concentration of GXM in serum, and worse histopathological parameters compared to similar unpretreated infected rats. In addition, HKC-CFA treatment produced a T helper 1 (Th1) profile with improvements in the spleen cell proliferative response, in the level of INFgamma production by CD4 T cells, and in the nitric oxide (NO) production by peritoneal cells. On the other hand, rats treated with CPS-CFA showed an increased level of the immunoregulatory cytokine IL10 production by CD4 T cells, but no modification in the NO production by peritoneal cells.

Heat killed cells ofCryptococcus neoformansvar.grubiiinduces protective immunity in rats: immunological and histopathological parameters