Abstract
Human malignant mesotheliomas were studied by electron microscopy. Three main types of cells were seen--submesothelial epithelioid cells, epithelial lining cells and fibroblast-like cells. In submesothelial epithelioid cells prominent arrays of intermediate (10 nm) filaments were often seen attached to plasma membrane, mitochondria, nuclei and concentric whorls of rough endoplasmic reticulum. The other types of cell found in the tumors, epithelial lining cells and fibroblast-like cells, lacked such distinct filaments. The intermediate filaments were especially abundant in cells with extensive whorling of endoplasmic reticulum. The association of intermediate filaments with such deranged cytoplasmic organization suggests that they play a role in the altered behavior of malignant cells.
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