Abstract:
:Isolated rat hepatocytes were preincubated with egg lecithin liposomes containing [3H]dolichol and [3H]dolichyl ester, and the intracellular levels and distributions of these lipids were subsequently determined after incubation in a liposome-free medium. [3H]Dolichol was recovered initially mainly in microsomes, and no increase with time in the low level of this compound in the mitochondrial/lysosomal fraction could be observed. A small portion of the labeled dolichol was esterified in the endoplasmic reticulum and transferred to the lysosome-containing fraction. [3H]Dolichyl linoleate was initially localized in microsomes and supernatant, but later accumulated in the mitochondria/lysosomes. Dolichyl linoleate was found in the membrane of microsomes, in the membrane and lumen of lysosomes, and in the soluble cytoplasm. Exogenous dolichol recovered in microsomes was not phosphorylated to any significant extent. Liposomal phosphatidylcholine also showed preferential accumulation in microsomes after incubation with hepatocytes. These results indicate that exogenous or endogenously formed dolichyl esters are transferred from the endoplasmic reticulum to lysosomes, probably through the cytoplasm. It appears that fatty acids play a role in targeting these lipids to their intracellular locations.
journal_name
Lipidsjournal_title
Lipidsauthors
Tollbom O,Chojnacki T,Dallner Gdoi
10.1007/BF02536470subject
Has Abstractpub_date
1992-04-01 00:00:00pages
248-54issue
4eissn
0024-4201issn
1558-9307journal_volume
27pub_type
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