Navegando por Autor "Tamashiro, Wirla Maria da Silva Cunha"
Agora exibindo 1 - 2 de 2
Resultados por página
Opções de Ordenação
Item Adoptive transfer of dendritic cells expressing CD11c reduces the immunological response associated with experimental colitis in BALB/c mice.(2018) Paiatto, Lisiery Negrini; Silva, Fernanda Guimarães Drummond e; Yamada, Aureo Tatsumi; Tamashiro, Wirla Maria da Silva Cunha; Simioni, Patricia UcelliIntroduction In addition to conventional therapies, several new strategies have been proposed for modulating autoimmune diseases, including the adoptive transfer of immunological cells. In this context, dendritic cells (DCs) appear to be one of the most promising treatments for autoimmune disorders. The present study aimed to evaluate the effects of adoptive transfer of DCs obtained from both naïve and ovalbumin (OVA)-tolerant mice on the severity of TNBS induced colitis and analyze the eventual protective mechanisms. Methods and results To induce oral tolerance, BALB/c mice were fed 4mg/mL OVA solution for seven consecutive days. Spleen DCs were isolated from tolerant (tDC) and naïve (nDC) mice, and then adoptively transferred to syngeneic mice. Three days later, colitis was induced in DC treated mice by intrarectal instillation of 100μg2,4,6-trinitrobenzenesulfonic acid (TNBS) dissolved in 50% ethanol. Control subjects received only intrarectal instillation of either TNBS solution or a vehicle. Five days later, mice from all groups were euthanized and examined for physiological and immunological parameters. Regarding the phenotype, we observed that the frequencies of CD11+ MHC II+ and CD11+ MHCII+ CD86+ cells were significantly lower in DCs isolated from tolerant mice than in those from naive mice. However, pretreatment with both types of DCs was able to significantly reduce clinical signs of colitis such as diarrhea, rectal prolapse, bleeding, and cachexia, although only treatment with tDCs was able to prevent weight loss from instillation of TNBS. In vitro proliferation of spleen cells from mice treated with either type of DCs was significantly lower than that observed in splenic cell cultures of naïve mice. Although no significant difference was observed in the frequencies of Treg cells in the experimental groups, the frequency of Th17+CD4+cellsand the secretion of IL-17 were more reduced in the cultures of spleen cells from mice treated with either type of DCs. The levels of IL-9 and IFN-γ were lower in supernatants of cells from mice treated with nDCs. Conclusion The results allow us to conclude that the adoptive transfer of cells expressing CD11c is able to reduce the clinical and immunological signs of drug-induced colitis. Adoptive transfer of CD11c+DC isolated from both naive and tolerant mice altered the proliferative and T cell responses. To the best of our knowledge, there is no previously published data showing the protective effects of DCs from naïve or tolerant mice in the treatment of colitis.Item Intake of protein hydrolysates and phenolic fractions isolated from flaxseed ameliorates TNBS-Induced colitis.(2018) Silva, Fernanda Guimarães Drummond e; Paiatto, Lisiery Negrini; Yamada, Aureo Tatsumi; Netto, Flavia Maria; Simioni, Patricia Ucelli; Tamashiro, Wirla Maria da Silva CunhaScope In the attempt to develop new therapeutic treatments for colitis, fractions containing phenolic compound isolate (Phi) and phenolic reduced‐flaxseed protein hydrolysate (phr‐FPH) from flaxseed are evaluated for their effects on the in vitro production of pro‐inflammatory mediators and on the course of experimental colitis. Methods and results The anti‐inflammatory effects of Phi and phr‐FPH from flaxseeds are studied in RAW264.7 cells and in trinitrobenzene sulphonic acid (TNBS) colitis model. It is observed that the incubation with Phi or phr‐FPH result in lower levels of tumor necrosis factor α and nitric oxide in macrophages stimulated with bacterial lipopolysaccharide + interferon‐γ. Prophylactic and therapeutic treatments with Phi and phr‐FPH, respectively, greatly contribute to the prevention of weight loss and colon inflammation in colitic BALB/c mice. T cell proliferation, expansion of TH1 and TH17 cells, and pro‐inflammatory cytokines are lower, whereas Treg cells are higher in spleen cell cultures from Phi‐treated mice. In addition, therapeutic phr‐FPH treatment is able to reduce the expansion of TH17 in splenic cell cultures. Conclusion The consumption of phenolic and protein compounds extracted from flaxseeds has a protective effect on TNBS‐induced colitis, and may be useful in the control of other inflammatory disorders.