Summary
Synthesized 1-(3H)-linoleoyl-2-(14C) linoleoyl glycerophosphoryl choline (PC) served as substrate for postheparin human plasma phospholipase activity. Essentially, no enzymatic activity could be found in pre-heparin plasma. Following i.v. heparin injection, however, the time course of phospholipase activity coincided with triglyceride lipase, diglyceride hydrolase and monoglyceride hydrolase activity which have been demonstrated in post-heparin plasma before. With double labelled PC it could be shown that there was no absolute positional specificity for either the α1 or β position in the lecithin molecule, but both fatty acid moieties are hydrolyzed with post-heparin plasma. This may be due to one single phospholipase or two separate phospholipases A1 and A2. Both enzymatic activities were found to be normal in patients with familial hyperlipoproteinemia type I (genetic deficiency of post-heparin plasma triglyceride lipase), type II, type III and type IV.
Zusammenfassung
Mit synthetisiertem 1-(3H)-linoleoyl-2-(14C) linoleoyl glycerophosphorylcholin (Lecithin) als Substrat wurde Phospholipase Aktivität in Post-Heparin Plasma bestimmt. Prä-Heparinplasma enthielt keine Phospholipase Aktivität. Mit doppelt radioaktiv markiertem Lecithin konnte gezeigt werden, daß sowohl die α1 als auch die β-Position hydrolytisch gespalten wird. Phospholipase A1 als auch Phospholipase A2 Aktivitäten unterschieden sich gegenüber anderen lipolytischen Enzymen im Plasma durch unterschiedliches Verhalten gegenüber Inhibitoren und Temperaturen. Patienten mit familiären Hyperlipoproteinämien der Typen I, II, III und IV besaßen normale Phospholipase Aktivitäten.
Similar content being viewed by others
References
Shore, B., Shore, V.: Heparin released lipolytic and esterolytic activities of human and rabbit plasmas. Amer. J. Physiol.201, 915 (1961).
Greten, H., Levy, R. I., Fredrickson, D. S.: Evidence for separate monoglyceride hydrolase and triglyceride lipase in post-heparin human plasma. J. Lipid Res.10, 326 (1969).
Vogel, W. C., Bierman, E. L.: Post-heparin human lecithinase in man and its positional specificity J. Lipid Res.8, 46 (1967).
—— —— Correlation between post-heparin lipase and phospholipase activities in human plasma. Lipids4, 385 (1969).
Fredrickson, D. S., Levy, R. I., Lees, R. S.: Fat transport in lipoproteins-an integrated approach to mechanisms and disorders. New Engl. J. Med.276, 32–44, 94–103, 148–156, 215–226, 273–281 (1967).
—— Ono, K., Davis, L.: Lipolytic activity of post-heparin plasma in hypertriglyceridemia J. Lipid Res.1, 24 (1963).
Greten, H., Levy, R. I., Fredrickson, D. S.: A further characterisation of lipoprotein lipase Biochim. biophys. Acta (Amst.)164, 185 (1968).
—— —— Fales, H., Fredrickson, D. S.: Hydrolysis of diglyceride and glycerylmonoester diethers with “lipoprotein lipase”. Biochim. biophys. Acta (Amst.)210, 39 (1970).
Haas, G. H. De, Postema, N. M., Neuwenhuizen, W., Deenen, L. L. M. van: Purification and properties of phospholipase A from porcine pancreas. Biochim. biophys. Acta (Amst.)159, 103 (1968).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Greten, H. Post-heparin plasma phospholipases in normals and patients with hyperlipoproteinemia. Klin Wochenschr 50, 39–41 (1972). https://doi.org/10.1007/BF01487774
Issue Date:
DOI: https://doi.org/10.1007/BF01487774