Summary
Chick embryo heart fragments in primary hanging-drop culture were treated with sodium fluoroacetate to induce inhibition of aconitate hydratase, a mitochondrial enzyme of the tricarboxylic acid cycle. The mitochondria were analyzed in the living myoblasts by phase-contrast time-lapse cinemicrography. The results were recorded in a 16 mm film. After 20–30 minutes contact of the cells with the inhibitor some mitochondria became thickened and swollen. The swelling was polymorphous, asynchronous and reversible; the same mitochondrion could swell and shrink many times. Some mitochondria seemed not to respond to fluoroacetate and remained rod-like. Mitochondria appeared the only cell components to be morphologically affected by fluoroacetate and the changes were specifically caused by the inhibitor. The type of mitochondrial swelling differed from the large-amplitude respiration-dependent swelling of the isolated mitochondria in vitro and from the configurational changes of isolated mitochondria associated with the respiratory states. The evidence pointed to a specific connection between the biochemical lesion caused by fluoroacetate and the configurational changes of the mitochondria. The mitochondrial swelling was to a large extent reversed by washing the cultures with Tyrode physiological saline solution and the reversal was further accentuated by incubation of the cultures in fresh nutrient medium.
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This work was supported by grants of the Consiglio Nazionale delle Richerce of Italy to both Institutes.
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Barasa, A., Godina, G., Buffa, P. et al. Biochemical lesions of respiratory enzymes and configurational changes of mitochondria in vivo . Z.Zellforsch 138, 187–210 (1973). https://doi.org/10.1007/BF00306607
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DOI: https://doi.org/10.1007/BF00306607