Lipidbiochemical Characterization of Various Kinds of Lysosomes

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Administration of chloroquine or 4, 4'-bis (diethylaminoethoxy) α, β-diethyldiphenylethane (DH) to rats in oral doses of 100mg/kg for 7 days causes phospholipid and cholesteryl ester accumulation in liver. We have isolated and characterized the lipids of subcellular fractions from control rats and rats treated with chloroquine, DH, and Triton WR-1339. The phospholipid content of liver is increased 1.5-fold by chloroquine or DH treatment but is unaffected by Triton WR-1339. Chloroquine and DH cause a shift of acid phosphatase from the light mitochondrial fraction (L) to the heavy mitochondrial fraction (M). Multilamellar bodies, an ultrastructural hallmark of chloroquine and DH-induced lipidosis, were isolated in a highly-purified form from the M fraction of chloroquine-or DH-treated rats. They are highly enriched in acid phosphatase indicating their lysosomal origin. In addition, they contain large amounts of phospholipid, cholesterol, and cholesteryl ester and are the sole site of bis (monoacylglycero) phosphate and the enzyme which catalyzes its synthesis from phosphatidylglycerol. Analysis of the phospholipid content shows that the entire excess phospholipid content of chloroquine-or DH-treated liver can be accounted for by the drug-induced multilamellar bodies. Triton WR-1339-induced lysosomes, which were isolated for comparison, also contain bis (monoacylglycero) phosphate and bis (monoacylglycero) phosphate synthetase. However, they differ from the drug-induced lysosomes in that their sphingomyelin content is much higher and their total phospholipid and phosphatidylinositol content much lower. The multilamellar bodies are the vrincinal intracellular site of accumulation of chloroquine and DH, respectively. Increased delivery of phospholipid to lysosomes and decreased lvsosomal catabolism of phospholipid are the factors which are thought to cause this experimental lipidosis. High levels of phosphatidylinositol in the multilamellar body may be in part responsible for the increased content of bis (monoacylglycero) phosphate since it has been identified as an acyl donor in bis (monoacylglycero) phosphate synthesis.
Japan Society of Clinical Chemistryの論文

Lipidbiochemical Characterization of Various Kinds of Lysosomes

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