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1.
Sao Paulo; s.n; 2005. 1 p. tab, graf.
Thesis in Portuguese | LILACS, Sec. Est. Saúde SP, HANSEN, Hanseníase Leprosy, SESSP-ILSLACERVO, Sec. Est. Saúde SP | ID: biblio-1241713

ABSTRACT

A hanseniase e doença infecciosa, causada pelo Mycobacterium leprae, um parasita intracelular obrigatorio nao cultivavel em meios artificiais. Esta doença pode se manifestar sob amplo espectro clinico, correspondendo a distintos padroes da resposta imunologica do hospedeiro ao M. leprae. Em um polo deste espectro, esta a forma de resistencia ao bacilo, a hanseniase tuberculoide (HT), na qual se desenvolve acentuada resposta imune celular especifica com efetivo controle da mutilaçao bacilar. O outro polo do espectro esta representado pela hanseniase virchoviana (HV), forma de baixa resistencia, em que a resposta imune celular seletivamente falha em eliminar o bacilo do organismo, resultando na disseminaçao da doença. O grupo dimorfo (HD) apresenta manifestaçoes intermediarias variaveis entre HT e HV, de acordo com o grau de resposta imune ao M. leprae. Considerando que na hanseniase existem poucos estudos avaliando os niveis sericos de anticorpos anti-PGL-I, neopterina e proteina C reativa (CRP) no momento do diagnostico e durante o tratamento poliquimioterapico, realizamos este estudo com os sguintes objetivos: A. Avaliar a resposta imune e inflamatoria de pacientes com hanseniase no momento do diagnostico e aos 2, 4, 6 e 12 meses de tratamento com poliquimioterapia (PQT) e nos estados reacionais, mediante a determinaçao dos niveis sericos de anti-PGL-I, de neopterina e de CRP....


Subject(s)
Male , Female , Humans , Adult , Middle Aged , Aged , Leprosy/immunology , Leprosy/microbiology , Leprosy/therapy , Neopterin , Neopterin/analysis , Neopterin/chemical synthesis , Protein C , Protein C/analysis , Protein C/chemistry , Drug Therapy, Combination , Nontuberculous Mycobacteria/growth & development , Nontuberculous Mycobacteria/physiology , Nontuberculous Mycobacteria/immunology
2.
Biochem Biophys Res Commun ; 275(2): 307-11, 2000 Aug 28.
Article in English | MEDLINE | ID: mdl-10964663

ABSTRACT

In vitro, interferon-gamma stimulates primate monocytes/macrophages to produce the pteridines neopterin and 7,8-dihydroneopterin. These pteridines are capable of modulating the oxidative potential of reactive species. Neopterin is pro-oxidative whereas 7, 8-dihydroneopterin is an effective antioxidant. In the presence of oxygen, 7,8-dihydroneopterin is rapidly oxidized and after loosing the side chain 7,8-dihydroxanthopterin is formed. It is considered that under physiological conditions, 7,8-dihydroneopterin cannot be a source for neopterin production. In this study it is demonstrated that hypochlorous acid is capable to oxidize 7,8-dihydroneopterin yielding neopterin. Neopterin is less affected by hypochlorous acid, and in a mixture of both pteridines similar to the in vivo situation, only 7,8-dihydroneopterin is oxidized, thereby increasing the ratio towards neopterin. The findings may beat relevance for the in vivo situation since hypochlorous acid shifts the neopterin/7, 8-dihydroneopterin ratio towards the side of neopterin, hence probably increasing the oxidative potential in a micro-environment.


Subject(s)
Hypochlorous Acid/chemistry , Neopterin/chemical synthesis , Pteridines/chemistry , Chromatography, High Pressure Liquid , Oxidation-Reduction , Radioimmunoassay
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