RESUMO
Schistosomiasis is a major public health problem with 207 million people infected and more than 779 million at risk. The drug of choice for treating schistosomiasis is praziquantel (PZQ); however, it is inefficient against immature forms of schistosomes. The aim of this study was to test new imidazolidine derivatives LPSF/PT09 and LPSF/PT10 against adult Schistosoma mansoni worms. IC50, cytotoxicity, immune response and cell viability assays were also available for these imidazolidines. Different concentrations of imidazolidine, from 32 to 320 »M, promoted motor abnormalities in breeding and unpaired worms, and death in 24 hours at higher concentrations. Although LPSF/PT09 and LPSF/PT10 did not affect IFN-³ and IL-10 production, they induced nitric oxide production and showed a similar behavior to praziquantel on cell death test. Thus, these new imidazolidine derivatives should undergo further study to develop schistosomiasis drugs.
Assuntos
Animais , Feminino , Ratos , Imidazolidinas/imunologia , Schistosoma mansoni/imunologia , Saúde PúblicaRESUMO
Fernando de Noronha Island, because of its ecological characteristics,has virtually no atmospheric pollution that could cause asthma. Nevertheless, asthma prevalence in children younger than 6 years old is 11.22%. 17 asthmatic children and 68 healthy ones were included in this case control study (1:4 case/controls) conducted in a closed community free from atmosphere pollution. Maternal asthma and exposure to smoking were more frequently associated with asthmatic children than with controls, the risk of asthmatic syndrome being respectively 6.9 and 4.6 times bigger. As for breastfeeding no protective effect was found in both cases and controls.