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Methylcholanthrene induced murine primitive neuroectodermal tumor: ultrastructure and nuclear RNA polymerase activity

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Summary

The histology, ultrastructure, and nuclear RNA polymerase activity are described in a murine primitive neuroectodermal tumor derived by serial transplantation from a tumor originally induced with methylcholanthrene and classified as an ependymoblastoma. The light microscope and ultrastructural studies show that this tumor does not contain the distinguishing morphological features of differentiated ependymal cells which are also commonly seen in human ependymomas. One outstanding feature is the size and number of the nucleoti. The mean number of nucleoli/nucleus is 4 which is two to four times that of the normal neuroglial cell. The nucleolar diameter is about twice that found in normal neuroglial cells. The nuclear RNA synthesizing activity is the highest of the chemically induced animal tumors we have studied. The alpha amanitin inhibition is the lowest seen in any of these tumors which suggests that the RNA polymerases inhibited by alpha amanitin contribute less to the total nuclear RNA synthesis. Adriamycin significantly inhibits the nuclear RNA polymerase activity of this tumor.

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  1. Laboratory for Neurochemistry, Division of Neurosurgery, Department of Surgery, University of Kentucky College of Medicine, 40506, Lexington, KY, USA

    D. E. Slagel

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Slagel, D.E. Methylcholanthrene induced murine primitive neuroectodermal tumor: ultrastructure and nuclear RNA polymerase activity. Acta Neuropathol 44, 173–182 (1978). https://doi.org/10.1007/BF00691064

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