A distribuição dos eosinófilos nas diferentes fases de evolução do granuloma hepático em camundongos infectados pelo Schistosoma mansoni / Distribution of eosinophils at different stages of hepatic granuloma evolution in mice infected with Schistosoma mansoni

No presente estudo, avaliou-se a distribuição dos eosinófilos nas diferentes fases da formação do granuloma hepático de camundongos infectados pelo Schistosoma mansoni. A partir dos resultados obtidos sugerimos uma nova classificação para a evolução do granuloma hepático em camundongos montada a partir de fases descritas por outros autores. Em cada fase há um padrão diferente de distribuição dos eosinófilos. Na fase necrótico-exudativa os eosinófilos encontram-se concentrados na periferia e no centro do granuloma e na área de necrose eles são escassos; na "produtiva" os eosinófilos estão ainda distribuídos de maneira difusa por todo o granuloma; na de cura por fibrose se concentram na periferia e no centro do granuloma. Os eosinófilos estavam em contato direto com os ovos em todos os estágios de evolução dos granulomas. Conclui-se então que a dinâmica dos eosinófilos possui papel importante na formação da reação granulomatosa do hospedeiro e resolução do processo inflamatório causado pelo ovo do parasita, além de acrescentar novos dados na classificação dos granulomas hepáticos.

In the present study, the distribution of eosinophils at different stages of the formation of hepatic granuloma in mice infected with Schistosoma mansoni was evaluated. From the results obtained, we suggest a new classification for the evolution of hepatic granuloma in mice, constructed from the phases described by other authors. In each phase, there is a different pattern of eosinophil distribution. In the exudative-necrotic phase, the eosinophils are concentrated in the periphery and center of the granuloma, and are scarce in the necrotic area; in the productive phase, the eosinophils are dispersed throughout the granuloma; and in the cure due to fibrosis phase, the eosinophils are concentrated in the periphery and center of the granuloma. Eosinophils were found in direct contact with the eggs at all stages of evolution of the granuloma. It was concluded that the dynamics of eosinophils have an important role in forming the granulomatous reaction of the host and in resolving the inflammatory process caused by the parasite egg, as well as adding new data regarding hepatic granuloma classification.

The Electron Microscopic Study of Enzymes in Eosinophils

The author has made the electron microscopic study of enzymes in eosinophils in order to clearify the influence of hyposensitization in allergic rhinitis to the activity of enzymes in eosinophilic granules and the following results were obtained. 1. In all 3 control, hyposensitization and allergic groups, eosinophilic granules with matrix and crystalloid core in circulating blood and tissue was observed. 2. In all 3 groups, activity of acid phosphatase was not found in neutrophil, basophil, macrophage and glands as a form of coagulated activating colony of acid phosphatase. 3. In control and hyposensitizing groups, number of eosinophils were smaller than that was counted in allergic group. Activity of peroxidase in granule was weak and granular out flowing and rupture of cell membrane were not observed. 4. In allergic group, eosinophil count was high, activity of peroxidase in granule was strong and granular out flowing and rupture of cell membrane were severe. At the same time, many vacuoles, which were suspected to be the result of phagocyte the protein as foreign substance, wag observed. Judging from the fact that eosinophil has a specific relation to allergic diseases and the activity of peroxidase that exist as an enzyme in eosinophilic granule is strong, it is believed that the major function of eosinophil is phagocytosis of antigen, or antigen-antibody complex. On the other hand, the fact that activity of peroxidase was weak in hyposensitizing group lead us to believe that the activity of peroxidase may be used as an indicator for detecting hyposensitizing status in the treatment of allergic disease.