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Effects of microsporidia on the striated parietal muscle of rhynchosciara angelae diptera sciaridae



Effects of microsporidia on the striated parietal muscle of rhynchosciara angelae diptera sciaridae



Journal of Invertebrate Pathology 30(3): 422-428



Nuclear hypertrophy and RNA synthesis were studied in the multinucleated striated muscle of R. angelae infected by the microsporidia Thelohania sp. Infection varied from fibers with few microsporidian cells to fibers completely occupied by the infective agent. Usually the terminal portions of the fibers were free of microsporida. Host-cell nuclei located in these regions (OM nuclei) were less affected than the nuclei of the same fiber that were completely surrounded by the cells of the parasite (IM). There was a correlation between the volume attained by the OM nuclei and their location in the fiber: the closer the nuclei to the microsporidia the higher the nuclear hypertrophy. Despite the errors peculiar to autoradiography, grain counting showed that the nuclei of infected fibers were more active in the incorporation of RNA precursor than the normal noninfected fibers. Two additive mechanisms are suggested through which the microsporidia could influence the host-cell nucleus: enhancement of the metabolism induced by juvenile hormone and a further increased in the overall metabolism to repair the disruption imposed by the microsporidian development.

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Accession: 005314400

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