Abstract
Time-lapse cinephotomicrography of mouse embryonic fibroblasts before and shortly after perfusion of tissue cultures reveals that the elongation of mitochondria caused by coenzyme A results from the terminal association of many shorter rods into a smaller number of long filaments. These are not permanent associations, but they reflect an exaggeration of the cohesive tendency of mitochondria, which in untreated cells is counterbalanced by frequent disjoinings and breakings of the anastomotic network. Our own observations and a survey of the literature suggest that elongate mitochondria with rapid movement and high metabolic activity tend to accompany proliferation in tissue cultures, and that mitotic inhibition of cultured cells may go together with short, slow mitochondria of low metabolic activity. The movement of mitochondria may be both active, reflecting metabolic exchanges with the cytoplasm, and passive, the result of hyaloplasmic currents.
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Selected References
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