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Incorporation of radioiodinated fatty acids into cardiac phospholipids of normoxic canine myocardium

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Abstract

The aim of this study was to assess the phospholipid distribution of radioiodinated 17-iodoheptadecanoic acid (IHDA), 15-(p-iodophenyl)pentadecanoic acid (p-IPPA) and 15-(p-iodophenyl)-3,3-dimethylpentadecanoic acid (DMIPPA) under normoxic conditions and to compare these data with the fatty acid composition of the phospholipid classes. After simultaneous i.v. injection of the radioiodinated fatty acids (1-123-IHDA; 1-131-p-IPPA; 1-125 DMIPPA) in open-chest dogs seven myocardial biopsies were taken over 40 min (n = 26). After lipid extraction of the biopsies the organic phase was analyzed for both neutral and polar lipids by two different TLC systems. The following polar lipid fractions were analyzed: lysophopshatidylcholine (LPC), sphingomyelin (SPH), phosphatidy1choline (PC; lecithin), phosphatidylinositol (PI), phosphatidylserine (PS), phosphatidylethanolamine (PE), diphosphatidylglycerol (DPG; cardiolipin) and neutral lipids. Fractions were counted in a gamma well counter and corrected for cross-over and recovery. Results of the polar phospholipids analysis showed that IHDA has the highest incorporation into the phospholipids. The IHDA was mainly incorporated into PI (45.6%) followed by PC (30.9%), PE (14.0%) and PS (5.6%). The p-IPPA was predominantly incorporated incorporated into PC (37.2%), followed by PS (20.1%) and PE (13.7%). In contrast to IHDA, incorporation of p-IPPA into PI was small (6.4%). The DMIPPA analogue was incorporated into phopsholipids to only a very small degree, compared to IHDA and p-IPPA. PS (27.4%) was the only considerable phospholipid fraction into which DMIPPA was incorporated.

The results clearly demonstrated that these radioiodinated fatty acid analogues have entirely different patterns of phospholipid incorporation. Major resemblances have been found between the incorporation into phospholipids of IHDA and the phospholipid distribution of the natural counterpart: stearic acid. The p—IPPA phospholipid incorporation only partly resembles the phospholipid distribution of palmitic acid. DMIPPA is because of its modified structure, incorporated into phospholipids to a low extent, mainly into PS. (Mol Cell Biochem116: 79–87, 1992)

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Authors and Affiliations

  1. Dept. of Cardiology, Metabolic Laboratory, Free University Hospital Amsterdam, Amsterdam, The Netherlands

    T. Teerlink

  2. Dept. of Physiology, University of Limburg, The Netherlands

    G. J. van der Vusse

  3. Nuclear Medicine Group, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee, USA

    F. F. Knapp Jr.

  4. Dept of Cardiology, Free University Hospital, De Boelelaan 1117, 1007 MB, Amsterdam, The Netherlands

    G. W. Sloof

Authors
  1. G. W. Sloof
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  2. F. C. Visser
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  3. T. Teerlink
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  4. E. F. I. Comans
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  5. M. J. van Eenige
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  6. G. J. van der Vusse
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  7. F. F. Knapp Jr.
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Sloof, G.W., Visser, F.C., Teerlink, T. et al. Incorporation of radioiodinated fatty acids into cardiac phospholipids of normoxic canine myocardium. Mol Cell Biochem 116, 79–87 (1992). https://doi.org/10.1007/BF01270573

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