Palmitic acid-labeled lipids selectively incorporated into platelet cytoskeleton during aggregation

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Lipids; (USA)

DOI:https://doi.org/10.1007/BF02537979· OSTI ID:6511144

Packham, M A; Guccione, M A; Bryant, N L; Livne, A ^[1]

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1. Univ. of Toronto, Ontario (Canada)

Previous experiments showed that during the early stages (20-30 seconds) of aggregation induced by adenosine diphosphate (ADP, 2 microM) or thrombin (0.1 U/mL) of rabbit or human platelets prelabeled with (3H)palmitic acid, labeled lipid became associated with the cytoskeleton isolated after lysis with 1% Triton X-100, 5 mM EGTA (ethylene glycol-bis-(beta-aminoethyl ether))-N,N,N',N'-tetra-acetic acid. The association appeared to be related to the number of sites of contact and was independent of the release of granule contents. We have now investigated the nature of the labeled lipids by thin-layer and column chromatography and found differences between the distribution of the label in intact platelets (both stimulated and unstimulated) and the isolated cytoskeletons. In both species, and with either ADP or thrombin as aggregating agent, 70-85% of the label in both intact platelets and in the cytoskeletons was in phospholipids. The distribution of label among the phospholipids in the cytoskeletons was similar to that in intact platelets except that the percentage of label in phosphatidylcholine was significantly higher in the cytoskeletons of human platelets than in the intact platelets, and the percentage of label in phosphatidylserine/phosphatidylinositol was significantly lower in the cytoskeletons of rabbit platelets and thrombin-aggregated human platelets than in intact platelets. The cytoskeletons contained a lower percentage of label in triacylglycerol, diacylglycerol, and cholesterol ester than the intact platelets. Contrary to a report in the literature, we found no evidence for the incorporation of diacylglycerol and palmitic acid into the cytoskeleton.

• OSTI ID: 6511144
• Journal Information: Lipids; (USA), Journal Name: Lipids; (USA) Vol. 25:7; ISSN LPDSA; ISSN 0024-4201
• Country of Publication: United States
• Language: English

Related Subjects

550501* -- Metabolism-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ADP
ALCOHOLS
ANIMALS
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BLOOD COAGULATION
BLOOD PLATELETS
BODY FLUIDS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHROMATOGRAPHY
COAGULANTS
DRUGS
EGTA
ENZYMES
GLYCOLS
HEMATOLOGIC AGENTS
HEMOSTATICS
HEXADECANOIC ACID
HYDROGEN COMPOUNDS
HYDROLASES
HYDROXY COMPOUNDS
ISOTOPE APPLICATIONS
LABELLING
LIPIDS
LIQUID COLUMN CHROMATOGRAPHY
MAMMALS
MAN
MATERIALS
METABOLISM
MONOCARBOXYLIC ACIDS
NUCLEOTIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
PEPTIDE HYDROLASES
PRIMATES
RABBITS
SEPARATION PROCESSES
SERINE PROTEINASES
THIN-LAYER CHROMATOGRAPHY
THROMBIN
TRACER TECHNIQUES
TRITIUM COMPOUNDS
VERTEBRATES