ABSTRACT
O Câncer de cólon é um dos tipos mais comuns de câncer no mundo e a segunda principal causa de morte relacionada a esta doença em países desenvolvidos. Até 75% dos casos estão associados com a alimentação, indicando que uma pessoa pode reduzir o seu risco simplesmente através de modificação na dieta. Estudos em animais demonstram que várias cepas de bactérias ácido lácticas protegem contra o câncer de cólon em roedores, embora os dados em humanos sejam limitados e conflitantes. O objetivo deste estudo foi investigar a eficácia das bactérias ácido lácticas no tratamento e redução do câncer de cólon em modelo animal. Foram realizadas buscas sistemáticas em bases de dados eletrônicas alcançando 1079 artigos relacionados, entretanto apenas 6 artigos foram eleitos de acordo com os critérios de elegibilidade para análise. Todos os artigos avaliados apresentaram resultados satisfatórios quanto à inibição do câncer de cólon em ratos e camundongos ao utilizarem cepas predominantemente do gênero Lactobacillus. Este estudo pode responder a hipótese de que as bactérias ácido lácticas apresentam efeito preventivo e antitumoral contra o câncer de cólon.(AU)
Colon cancer is one of the most common types of cancer in the world and the second leading cause of death related to the disease in developed countries. Up to 75% of cases are associated with eating, indicating that a person can reduce their risk simply through dietary modification. Studies in animals show that various strains of lactic acid bacteria protect against colon cancer in rodents although data in humans are limited and conflicting. The aim of this study was to investigate the efficacy of acid lactic bacteria in the treatment and reduction of colon cancer in animal models. Systematic searches were conducted in electronic databases reaching 1079 related articles, only six articles were elected according instead of to the eligibility criteria for analysis. All reviewed articles showed satisfactory results on the inhibition of colon cancer in rats and mice when using predominantly Lactobacillus strains. This study can answer hypothesis that acid lactic bacteria has antitumor effect against colon cancer.(AU)
Subject(s)
Animals , Mice , Rats , Rats, Wistar , Colonic Neoplasms/diet therapy , Lactic Acid/therapeutic use , Probiotics/therapeutic use , Mice, Inbred BALB C , Mice, Inbred C57BL , Models, Animal , Antineoplastic Agents/analysisABSTRACT
Background Streptomyces sp. DPUA 1576 from Amazon lichens was studied to protease and fibrinolytic production. A 2² factorial experimental design was applied to optimize its protease enzyme production using two independent variables, namely soybean flour and glucose concentrations. Results The optimal conditions to obtain high protease production (83.42 U/mL) were 1.26% soybean flour and 1.23% glucose concentration. A polynomial model was fitted to correlate the relationship between the two variables and protease activity. In relation to fibrinolytic activity, the highest activity of 706.5 mm² was obtained at 1.7% soybean flour and 1.0% glucose concentration, which was 33% higher than plasmin. Fibrinolytic production was not optimized in the studied conditions. Conclusions These results show that the optimization of the culture medium can enhance protease production, thus becoming a good process for further research. In addition, Streptomyces sp. DPUA 1576, isolated from Amazon lichens, might be a potential strain for fibrinolytic protease production.