Abstract
The shape, distribution, and content of mitochondria in individual cells were examined during the cell cycle phases (G(0)/G(1), S, G(2) mitosis) in living human fibroblasts by static cytofluorometry and fluorescence microscopy. The morphocytochemical evaluations were performed in cell cultures submitted to double supravital fluorochrome staining with Hoechst 33342 and DiOC(6) to label DNA and mitochondria, respectively. The staining modalities were based on the stability of mitochondrial labeling. The G(1) to early S phases were characterized by the presence of filamentous mitochondria, except during the early postmitotic period. During late S, G(2), and mitotic phases, mitochondrial mass reached its highest value and mitochondria became short and numerous. During the last stage of mitosis, mitochondria were distributed among daughter cells through a cytoplasmic bridge.
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