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The βA4 Amyloid Peptide Enhances Cellular Uptake of Apolipoprotein E-Containing Lipoproteins by the Low-Density Lipoprotein Receptor-Related Protein/α 2-Macroglobulin Receptor

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Book cover Apolipoprotein E and Alzheimer’s Disease

Summary

We incubated β-very low density lipoprotein (β-VLDL) from cholesterol-fed rabbits with βA4 amyloid peptide (43mer). βA4 associated with the apolipoprotein E moiety of the βVLDL. The binding of βA4 to apolipoprotein E could not be dissociated with sodium dodecyl sulphate. Unlike native βVLDL, the βA4/βVLDL complexes bound to the low-density lipoprotein (LDL) receptor-related protein of normal and familial hypercholesterolemia fibroblasts in culture. The βA/βVLDL complexes were taken up into the cells, but escaped proteolytic degradation. The cellular uptake of βA4/βVLDL com plexes was independent from the LDL receptor pathway; it was inhibited by an excess of unlabelled, activated α 2-macroglobulin. βA4 competed with the binding and the uptake, but not the degradation, of 125I-labelled α 2-macroglobulin in fibroblasts. Considered together, the data suggest that the association of βA4 with apolipoprotein E-containing lipoproteins gives rise to complexes that are endocytosed through the LDL receptor-related protein but fails to undergo proteolytic degradation in the lysosomes. These findings may be relevant to the pathobiochemistry of Alzheimer’s disease.

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© 1996 Springer-Verlag Berlin Heidelberg

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Scharnagl, H. et al. (1996). The βA4 Amyloid Peptide Enhances Cellular Uptake of Apolipoprotein E-Containing Lipoproteins by the Low-Density Lipoprotein Receptor-Related Protein/α 2-Macroglobulin Receptor. In: Roses, A.D., Weisgraber, K., Christen, Y. (eds) Apolipoprotein E and Alzheimer’s Disease. Research and Perspectives in Alzheimer’s Disease. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-80109-9_11

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  • DOI: https://doi.org/10.1007/978-3-642-80109-9_11

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-80111-2

  • Online ISBN: 978-3-642-80109-9

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