Abstract
Intracellular localization of gallium-67 was investigated in Morris hepatoma-7316A and Shionogi mammary carcinoma-115 cells by the cell fractionation method 48 hr after an intraperitoneal injection of the nuclide. When lysosomes were purified from both tumors by discontinuous sucrose density gradient centrifugation, they had a strikingly high relative specific activity of the nuclide. From these results it was confirmed that gallium-67 is concentrated most specifically in the lysosomes of both tumor cells, which consist chiefly of phagolysosomes and can engulf only limited amount of foreign materials such as Triton and gallium-67.
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