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The cholesteryl esters which make up the bulk of the core of the human low-density lipoprotein particle were removed by extraction into heptane and replaced with the fluorescent anthroyl or N-(7-nitrobenzyl-2-oxa-1,3-diazol-4-yl)aminohexanoyl esters of dolichol. The reconstituted low-density lipoproteins were efficiently internalized by normocholesterolaemic human fibroblasts but not by fibroblasts from patients lacking the low-density-lipoprotein receptor, or lacking the ability to internalize the receptor-lipoprotein complex. In normal fibroblasts, the reconstituted low-density lipoproteins were delivered to lysosomes after internalization. The results suggest that (i) dolichol intermediates in the human circulation are normally carried on low-density lipoproteins and (ii) that low-density lipoproteins are involved in the accumulation of dolichol intermediates in lysosomes during normal human aging and in certain diseases involving the lysosome. In addition, by incorporating these very hydrophobic probes into low-density lipoprotein, they can be presented to cells in culture at high concentration in a water-soluble form.

Low-density lipoprotein as a transporter of dolichol intermediates in the mammalian circulation