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Acyl-carnitine effects on isolated cardiac mitochondria and erythrocytes

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Summary

The effects of various long-chain acyl-carnitines (AC) on mitochondrial functions and red cell membrane stability were studied. Lower concentrations slightly stimulate respiration-dependent functions such as phosphorylation rate and Ca++ uptake velocity, whereas higher concentrations inhibit these functions with concomitant depression of the ATP/O ratio. The order of effectiveness among the AC is very similar for different mitochondrial function. The differences among AC in their actions on red cell stability in hypotonic media and their differences in influence on mitochondiral functions exhibit less resemblance. The relative order of erythrolytic concentrations of AC follows the order of their critical micellar concentration. Model calculations indicate that the concentrations of AC found in ischemic hearts are below those which exhibit inhibitory effects in vitro. Ultrastructural changes in mitochondria incubated with AC are different from those found in ischemic tissue. From this, it seems questionable whether the elevated AC levels in ischemic hearts are indeed as importan for the development of membrane damage as is often supposed.

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Author notes

  1. M. H. Piper

    Present address: Zentrum Physiologie und Pathophysiologie, Universität Göttingen, Abteilung Herzstoffwechsel und Physiologie der Wiederbelebung, Humboldtallee 7, D-3400, Göttingen, FRG

Authors and Affiliations

  1. Zentrum Physiologie und Pathophysiologie, Universität Göttingen, Abteilung Herzstoffwechsel und Physiologie der Wiederbelebung, Humboldtallee 7, D-3400, Göttingen, FRG

    O. Sezer, P. Schwartz, J. F. Hütter, C. Schweickhardt & P. G. Spieckermann

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  1. M. H. Piper
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  2. O. Sezer
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  4. J. F. Hütter
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Supported by the Deutsche Forschungsgemeinschaft, SFB 89, Kardiologie Göttingen.

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Piper, M.H., Sezer, O., Schwartz, P. et al. Acyl-carnitine effects on isolated cardiac mitochondria and erythrocytes. Basic Res Cardiol 79, 186–198 (1984). https://doi.org/10.1007/BF01908305

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  • DOI: https://doi.org/10.1007/BF01908305

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