The Correlation Between Tissue Differentiation and Production of Mammary Tumor Virus (MTV) in Transplanted Murine Mammary Tumors. Electron Microscopic Observations

Overview

Journal J Cancer Res Clin Oncol

Specialty Oncology

Date 1983 Jan 1

PMID 6298246

Authors

C Schopper

E FASSKE

R FETTING

H Themann

Affiliations

Soon will be listed here.

Abstract

The spontaneous mammary tumors of the NMRI mouse are well developed microcystic adenocarcinomas. Serial isologous transplantation of the tumors results in nearly complete dedifferentiation to a solid tumor, in which only electron-microscopically rudimentary acinus-like microlumina can be observed. The adenocarcinomas produce A and B particles in abundance, with the A particles appearing intracellularly in the adluminal cytoplasmic regions of the epithelial cells in association with typical cellular structures and the B particles being restricted to closed extracellular compartments such as vacuoles or acini alone. The loss of alveolar organization in the solid tumors is followed by an almost complete reduction in mature B particles, while A particles are still regularly observed and appear to be less reduced in number. This suggests that the production of extracellular B particles is dependent upon the secretory activity of the tumor cells and that in nonsecreting cells it is predominantly a late step in virus release that is inhibited, not the synthesis of intracellular precursors.

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