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The binding of the calcium transport inhibitors reserpine, chlorpromazine and prenylamine to the lipids of the membranes of the sarcoplasmic reticulum

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Zusammenfassung

1. Reserpin, Chlorpromazin, Prenylamin und Imipramin werden sowohl von den isolierten Vesikeln des sarkoplasmatischen Reticulums (quergestreifte Muskulatur von Kaninchen) als auch von den aus diesen mit Chloro-form-Methanol (2:1) extrahierten Lipiden gebunden.

2. Bei einer Konzentration von 10−4 M werden Reserpin, Chlorpromazin und Prenylamin von dem intakten Lipoproteinkomplex der Vesikelmembran in Mengen von 0,1 μmol/mg Vesikelprotein, von 0,2 μmol/mg vesikulärem Total-Lipid und von ∼0,4 μmol/mg Phosphatidylcholin (Lecithin) gebunden. Lipidfreies Vesikelprotein hat keine Bindungsfähigkeit.

3. Die Bindung der Pharmaka ist reversibel und temperaturunabhängig.

4. Die Bindungsfähigkeit der Phospholipide ist nicht beeinträchtigt, wenn diese durch Phospholipase A, C oder D hydrolysiert werden. Sie wird jedoch aufgehoben durch Hydrierung der isolierten bzw. der membrangebundenen Lipide. Nach Hydrierung ist auch die Calcium-Aufnahme, die ATP-Extraspaltung und die Phosphatübertragung aufgehoben.

5. Die lipidfreien Proteine Myokinase und Actin werden durch den Hydrierungsvorgang funktionell nicht beeinflußt.

Summary

1. Reserpine, chlorpromazine, prenylamine and imipramine are bound to vesicles isolated from the sarcoplasmic reticulum of rabbit striated muscle cells as well as by the lipids which can be extracted from the vesicular preparations.

2. At concentrations of 5×10−7 M reserpine, chlorpromazine and prenylamine, drug binding can just be detected. At drug concentrations of 10−4 M the drug uptake amounts to 0.1 μmol per mg vesicular protein, 0.2 μmol drug per mg vesicular lipid and ∼0.4 μmol drug per mg phosphatidylcholine.

3. Drug binding is reversible and temperature independent.

4. Drug binding is not diminished when the phospholipids are hydrolysed by phospholipase A, C or D.

5. Drug binding is abolished by hydrogenation of the isolated lipids as well as of the lipids bound to the membranes.

6. In addition calcium uptake the Ca++ induced increase in ATP breakdown and the phosphate transfer reaction are inhibited when the lipids in the membranes are hydrogenated.

7. The normal ATPase as well as the lipid free proteins myokinase and actin are not affected by hydrogenation.

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This work was presented at the common meeting of the Deutsche Pharmakologische Gesellschaft and the British Pharmacological Society Cambridge 1967 (Balzer and Makinose, 1968).

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Balzer, H., Makinose, M., Fiehn, W. et al. The binding of the calcium transport inhibitors reserpine, chlorpromazine and prenylamine to the lipids of the membranes of the sarcoplasmic reticulum. Naunyn-Schmiedebergs Arch. Pharmak. u. Exp. Path. 260, 456–473 (1968). https://doi.org/10.1007/BF00537360

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  • DOI: https://doi.org/10.1007/BF00537360

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