Summary
Some characteristics of the mitochondria of hepatocytes and of three hepatoma cell lines have been compared. By means of stereologic analysis of electron micrographs of cross-sections through cells the volume of mitochondria per unit volume of cell cytoplasm and the surface areas of the mitochondrial envelope and cristae membranes have been measured. The relative mitochondrial volume in the cytoplasm decreases with increasing growth rate but the surface area of outer and cristae membranes per unit volume of mitochondria is not altered. The internal organization of hepatoma mitochondria, however, differs distinctly from that of normal liver mitochondria as evident from electron micrographs ; the hepatoma cells contain mitochondria in which parallel cristae appear to cross the whole mitochondrial profile unlike the irregular, short cristae seen in normal liver mitochondria. Furthermore, in the fast-growing hepatoma cells the mitochondrial matrix appears less dense than in the hepatocyte. Hepatoma cells contain less organized rough endoplasmic reticulum than normal liver cells and the spatial relationship of the mitochondria to the rough cisternae, seen in the hepatocyte, is absent in the fast-growing hepatoma cell lines. It is concluded that hepatoma cells have fewer mitochondria than normal liver cells, but that the organelles have a normal content of inner membranes.
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Volman, H. A morphologic and morphometric study of the mitochondria in several hepatoma cell lines and in isolated hepatocytes. Virchows Arch. B Cell Path. 26, 249–259 (1978). https://doi.org/10.1007/BF02889552
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DOI: https://doi.org/10.1007/BF02889552