(V.) braziliensis compared to those in the animals infected with L. (L.) amazonensis. Interestingly, this change was just noted when experimental infections had opposite evolvements; while BALB/c mice infected with L. (L.) amazonensis developed a severe infection, with an increase in the lesion size, high tissue parasitism, and pathological process in the skin associated

with tissue destruction, the animals infected with L. (V.) braziliensis showed minimal skin lesions, scanty parasitism and slight high throughput screening pathological events in the skin sites of infection, thus suggesting that the early response of both DCs subsets in L. (L.) amazonensis BALB/C mice infection was unable to control the infection, despite a high expression of CD4+ cells. In contrast, the increase in these DCs subsets population was correlated with the regression of the L. (V.) braziliensis infection at 8th weeks PI and the increase in the number of CD4+ and CD8+ cells in the lesion site. These experimental differences in the immunopathogenic competences of parasites belonging to the subgenus Leishmania and Viannia seem to

confirm prior evidences looked at a clinical–immunopathological level of ACL because of L. (V.) braziliensis and L. (L.) amazonensis (5). Corroborating with the above results, it is worth noting that the experiment using DCs derived from human PBMC showed that L. (L.) amazonensis

was able to abrogate Opaganib cost full DCs differentiation, decreasing the expression of co-stimulator molecules and cytokines production, and not only causing a delay in the immune response but also favouring the establishment of L. (L.) amazonensis in the human host (20). Another study showing that DCs derived from L. (L.) amazonensis-infected mice were less potent in activating the IL-12-producing CD11c DC subsets, thus preferentially activating CD4+ T cells with IFN-γlow IL-10high check phenotypes (21), should also be highlighted. In addition, DCs infected with the amastigote form of L. (L.) amazonensis were less mature and less potent antigen-presenting cells than those infected with promastigote, as jugged by the lower expression of co-stimulatory molecules, suppressed IL-12 and increased IL-10 expression under positive stimuli, and reduced effectiveness for priming CD4+ T cells from naïve and infected mice, suggesting that L. (L.) amazonensis, specially its intracellular form, has developed strategies to down-regulate early innate signalling events, resulting in impaired DCs function and Th1 inactivation (22). By the other site, DCs experimentally infected with the promastigote form of L. (V.) braziliensis up-regulated activation markers, leading to a production of IL-12 and TNF-α.