Several studies have demonstrated that different clinical manifestations of human Chagas' disease are associated with distinct and complex host-parasite relationships directly involving the immune system. In this context, it has been proposed that tissue damage might be more severe in the absence of regulatory mechanisms that involve both innate and adaptive immune responses. Herein, we describe a descriptive phenotypic profile focusing on the frequency of major regulatory T cells [CD4
Snake venom is a complex biological mixture used for immobilization and killing of prey for alimentation. Many effects are inflicted by this venom, such as coagulation, necrosis, bleeding, inflammation, and shock. This study aimed to evaluate the inflammatory activity promoted by Bothrops erythromelas and Crotalus durissus cascavella snake venom. It was observed that both B. erythromelas and C. d. cascavella venom induced higher interferon-gamma and interleukin-6 production. Nitric oxide (NO) was significantly produced only by B. erythromelas venom, which also showed a higher rate of cell death induction when compared with C. d. cascavella. Results showed that B. erythromelas and C. d. cascavella venom induced distinct response in vitro through cytokines and NO production. However, B. erythromelas induces a proinflammatory response and a higher rate of cell death in relation to C. d. cascavella venom.
Introduction: Snake envenomings are a health problem in rural areas of tropical and subtropical countries, but little is known regarding the immune response presented by bitten individuals. The IgM production of patients bitten by Bothrops erythromelas snake was analyzed to identify the effectiveness of treatment in this type of envenomation. Methods: Bothrops erythromelas venom was submitted to electrophoresis and transferred to a nitrocellulose sheet, following incubation with patients' sera. Results: A 38 KDa protein was detected before and 24 h after therapy. Conclusions: The result suggests that this protein could be used as a marker for individuals envenomed by Bothrops. erythromelas.
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