SUCCINATE DEHYDROGENASE ACTIVITY IN UNEMBRYONATED EGGS, EMBRYONATED EGGS, MIRACIDIA AND METACERCARIAE OF SOME FLUKES

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The authors examined the activity of succinate dehydrogenase (S D) in Fasciola hepatica and Paragonimus westermani with the stages in development from cell division egg to metacercaria. As a result of this experiment, in the unicellular stages and miracidium stages of F. hepatica and P. westermani, a very slight SD activity was detected. However, in the miracidium formation stages of these flukes, the activity was very strong. Thus, it was clear that the reduction of methylene blue decreased suddenly from the highest value when metamorphosis occurred. It was suggested that respiratory metabolism rises with the progress of development and ability to decolorize methylene blue in creases. In the metacercaria stages of F. hepatica, P. westermani, Metagonimus yokogawai, the ability to decolorize methylene blue was persistent, but it was not so strong. During the time, so called hibernation time, when metacercaria invades into final host, metacercaria keeps metabolism of respiration as low as possible, and saves consumption of energy for maintenance of life. Metacercaria has biological function for parasitism.
久留米大学医学部 The Kurume Medical Journal 編集部の論文