Rol group. In addition, splenic T cells proliferative response was not altered in the presence of concanavalin-A (C). Subpopulations of leukocytes showed slight changes when compared to control subjects (D). Results are representative of three independent experiments. doi:10.1371/journal.pone.0065913.gsupernatants were 1480666 collected and assayed for cytokines (IL-4, IL-6, IL-10, IL-17, IFN-c and TNF-a) secretion using the Cytometric Bead Array (CBA, BD Biosciences, USA) according to manufacturers instructions.Analysis of Cellular Infiltration in the CNSFourteen days after EAE induction (in the prophylactic approach) and thirty days after EAE induction (in the therapeutic approach), mice were anesthetized, perfused with ice cold PBS and half of the spinal cords and brains were removed and stored at 280uC until use for RT-PCR assays; the remaining tissue was prepared for the enrichment of infiltrating leukocytes according to a AKT inhibitor 2 biological activity previously 11967625 described methodology and analyzed by flow cytometry [34].after the last dose of drug administration. Along with reduction in the total splenic cells number at higher doses (data not shown), our data showed that CQ treatment increased the numbers of regulatory T cells whereas the frequency of dendritic cells was reduced (Figure 1A and 1B, respectively). In order to evaluate whether CQ treatment promoted functional alterations in T cells, splenic lymphocytes from CQ treated-mice were cultured in the presence of concanavalin-A (Con-A) for 72 h. As depicted in figure 1C, the CQ treatment did not alter the proliferation capacity of T cells. Other subpopulations of leukocytes were also analyzed but only a slight change in the frequency of these cells was noticed compared to the control group (Figure 1D).Chloroquine Treatment Reduces the Clinical Evolution and Infiltration of the CNS in EAE MiceAn increase in regulatory T cells pool is associated with mild inflammation, whereas reduced dendritic cell numbers may impair proper antigen presentation to T cells, thus dampening adaptive immune response. In this context, the next goal was to determine whether prophylactic CQ administration was capable of modulating the course and severity of EAE. Hence, mice were subjected to CQ treatment (5 mg/kg/day) for five consecutive days, and three days after the last dose EAE was induced (Figure 2A) and the development of the disease accompanied daily. Mice that received CQ prior to EAE induction showed a significant reduction in weight loss compared with PBS-treated animals. Accordingly, the treatment was also capable to delay disease severity course (Figures 2B and 2C). As leukocytes infiltration in the CNS is directly associated with the severity of disease, we aimed to investigate whether the CQ treatment had altered brain inflammation. PBS- and CQ-treated EAE mice were killed and spinal cords were removed and stained with H/E. Corroborating results mentioned above, CQ treated-mice presented lower leukocytes infiltration in the CNS (Figure 2D). Overall, CQ administration was able to ameliorate the clinical course of EAE, most probably, because of the reduced cellular infiltration in the CNS. We next examined the profile of leukocytes that infiltrated the CNS of CQ SC66 chemical information treated-EAE mice. For that purpose brains and spinal cords were collected, minced and cellular suspensions were prepared and analyzed as described in M M section. Our results show that lymphocytes managed to overcome the blood-brain barrier and infiltrated the CNS of.Rol group. In addition, splenic T cells proliferative response was not altered in the presence of concanavalin-A (C). Subpopulations of leukocytes showed slight changes when compared to control subjects (D). Results are representative of three independent experiments. doi:10.1371/journal.pone.0065913.gsupernatants were 1480666 collected and assayed for cytokines (IL-4, IL-6, IL-10, IL-17, IFN-c and TNF-a) secretion using the Cytometric Bead Array (CBA, BD Biosciences, USA) according to manufacturers instructions.Analysis of Cellular Infiltration in the CNSFourteen days after EAE induction (in the prophylactic approach) and thirty days after EAE induction (in the therapeutic approach), mice were anesthetized, perfused with ice cold PBS and half of the spinal cords and brains were removed and stored at 280uC until use for RT-PCR assays; the remaining tissue was prepared for the enrichment of infiltrating leukocytes according to a previously 11967625 described methodology and analyzed by flow cytometry [34].after the last dose of drug administration. Along with reduction in the total splenic cells number at higher doses (data not shown), our data showed that CQ treatment increased the numbers of regulatory T cells whereas the frequency of dendritic cells was reduced (Figure 1A and 1B, respectively). In order to evaluate whether CQ treatment promoted functional alterations in T cells, splenic lymphocytes from CQ treated-mice were cultured in the presence of concanavalin-A (Con-A) for 72 h. As depicted in figure 1C, the CQ treatment did not alter the proliferation capacity of T cells. Other subpopulations of leukocytes were also analyzed but only a slight change in the frequency of these cells was noticed compared to the control group (Figure 1D).Chloroquine Treatment Reduces the Clinical Evolution and Infiltration of the CNS in EAE MiceAn increase in regulatory T cells pool is associated with mild inflammation, whereas reduced dendritic cell numbers may impair proper antigen presentation to T cells, thus dampening adaptive immune response. In this context, the next goal was to determine whether prophylactic CQ administration was capable of modulating the course and severity of EAE. Hence, mice were subjected to CQ treatment (5 mg/kg/day) for five consecutive days, and three days after the last dose EAE was induced (Figure 2A) and the development of the disease accompanied daily. Mice that received CQ prior to EAE induction showed a significant reduction in weight loss compared with PBS-treated animals. Accordingly, the treatment was also capable to delay disease severity course (Figures 2B and 2C). As leukocytes infiltration in the CNS is directly associated with the severity of disease, we aimed to investigate whether the CQ treatment had altered brain inflammation. PBS- and CQ-treated EAE mice were killed and spinal cords were removed and stained with H/E. Corroborating results mentioned above, CQ treated-mice presented lower leukocytes infiltration in the CNS (Figure 2D). Overall, CQ administration was able to ameliorate the clinical course of EAE, most probably, because of the reduced cellular infiltration in the CNS. We next examined the profile of leukocytes that infiltrated the CNS of CQ treated-EAE mice. For that purpose brains and spinal cords were collected, minced and cellular suspensions were prepared and analyzed as described in M M section. Our results show that lymphocytes managed to overcome the blood-brain barrier and infiltrated the CNS of.