Abstract
The structural requirement has been studied for apolipoproteins in their free form to interact with cells, to generate high density lipoprotein (HDL), and to cause cellular lipid efflux (J. Biol. Chem. 266, 3080–3086, 1991). It is shown that human apolipoprotein (apo) A-IV and apolipophorin III ofManduca sexta cause cholesterol efflux from cholesterol-loaded mouse peritoneal macrophages and reduce intracellularly accumulated cholesteryl ester as a results of forming HDL-like particles with cellular lipids, as do apoA-I, A-II and E. On the other hand, similar to apoC-III, reduced-and-carboxymethylated human apoA-II had no such effect. Thus, apolipoproteins seem to require at least four amphiphilic helical segments per molecule to express this function.
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Abbreviations
- apo:
-
apolipoprotein
- apoLpIII:
-
apolipophorin III
- CM:
-
reduced and carboxymethylated
- HDL:
-
high density lipoproteins
- SDS-PAGE:
-
polyacrylamide gel electrophoresis in the presence of sodium dodecylsulfate
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Hara, H., Hara, H., Komaba, A. et al. α-Helical requirements for free apolipoproteins to generate HDL and to induce cellular lipid efflux. Lipids 27, 302–304 (1992). https://doi.org/10.1007/BF02536480
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DOI: https://doi.org/10.1007/BF02536480