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The low density lipoprotein receptor regulates the level of central nervous system human and murine apolipoprotein E but does not modify amyloid plaque pathology in PDAPP mice.

Publication ,  Journal Article
Fryer, JD; Demattos, RB; McCormick, LM; O'Dell, MA; Spinner, ML; Bales, KR; Paul, SM; Sullivan, PM; Parsadanian, M; Bu, G; Holtzman, DM
Published in: J Biol Chem
July 8, 2005

Apolipoprotein E (apoE), a chaperone for the amyloid beta (Abeta) peptide, regulates the deposition and structure of Abeta that deposits in the brain in Alzheimer disease (AD). The primary apoE receptor that regulates levels of apoE in the brain is unknown. We report that the low density lipoprotein receptor (LDLR) regulates the cellular uptake and central nervous system levels of astrocyte-derived apoE. Cells lacking LDLR were unable to appreciably endocytose astrocyte-secreted apoE-containing lipoprotein particles. Moreover, cells overexpressing LDLR showed a dramatic increase in apoE endocytosis and degradation. We also found that LDLR knock-out (Ldlr-/-) mice had a significant, approximately 50% increase in the level of apoE in the cerebrospinal fluid and extracellular pools of the brain. However, when the PDAPP mouse model of AD was bred onto an Ldlr-/- background, we did not observe a significant change in brain Abeta levels either before or after the onset of Abeta deposition. Interestingly, human APOE3 or APOE4 (but not APOE2) knock-in mice bred on an Ldlr-/- background had a 210% and 380% increase, respectively, in the level of apoE in cerebrospinal fluid. These results demonstrate that central nervous system levels of both human and murine apoE are directly regulated by LDLR. Although the increase in murine apoE caused by LDLR deficiency was not sufficient to affect Abeta levels or deposition by 10 months of age in PDAPP mice, it remains a possibility that the increase in human apoE3 and apoE4 levels caused by LDLR deficiency will affect this process and could hold promise for therapeutic targets in AD.

Duke Scholars

Published In

J Biol Chem

DOI

ISSN

0021-9258

Publication Date

July 8, 2005

Volume

280

Issue

27

Start / End Page

25754 / 25759

Location

United States

Related Subject Headings

  • Receptors, LDL
  • Mice, Knockout
  • Mice, Inbred C57BL
  • Mice
  • Humans
  • Endocytosis
  • Disease Models, Animal
  • Brain
  • Biochemistry & Molecular Biology
  • Apolipoproteins E
 

Citation

APA
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MLA
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Fryer, J. D., Demattos, R. B., McCormick, L. M., O’Dell, M. A., Spinner, M. L., Bales, K. R., … Holtzman, D. M. (2005). The low density lipoprotein receptor regulates the level of central nervous system human and murine apolipoprotein E but does not modify amyloid plaque pathology in PDAPP mice. J Biol Chem, 280(27), 25754–25759. https://doi.org/10.1074/jbc.M502143200
Fryer, John D., Ronald B. Demattos, Lynn M. McCormick, Mark A. O’Dell, Michael L. Spinner, Kelly R. Bales, Steven M. Paul, et al. “The low density lipoprotein receptor regulates the level of central nervous system human and murine apolipoprotein E but does not modify amyloid plaque pathology in PDAPP mice.J Biol Chem 280, no. 27 (July 8, 2005): 25754–59. https://doi.org/10.1074/jbc.M502143200.
Fryer JD, Demattos RB, McCormick LM, O’Dell MA, Spinner ML, Bales KR, et al. The low density lipoprotein receptor regulates the level of central nervous system human and murine apolipoprotein E but does not modify amyloid plaque pathology in PDAPP mice. J Biol Chem. 2005 Jul 8;280(27):25754–9.
Fryer, John D., et al. “The low density lipoprotein receptor regulates the level of central nervous system human and murine apolipoprotein E but does not modify amyloid plaque pathology in PDAPP mice.J Biol Chem, vol. 280, no. 27, July 2005, pp. 25754–59. Pubmed, doi:10.1074/jbc.M502143200.
Fryer JD, Demattos RB, McCormick LM, O’Dell MA, Spinner ML, Bales KR, Paul SM, Sullivan PM, Parsadanian M, Bu G, Holtzman DM. The low density lipoprotein receptor regulates the level of central nervous system human and murine apolipoprotein E but does not modify amyloid plaque pathology in PDAPP mice. J Biol Chem. 2005 Jul 8;280(27):25754–25759.

Published In

J Biol Chem

DOI

ISSN

0021-9258

Publication Date

July 8, 2005

Volume

280

Issue

27

Start / End Page

25754 / 25759

Location

United States

Related Subject Headings

  • Receptors, LDL
  • Mice, Knockout
  • Mice, Inbred C57BL
  • Mice
  • Humans
  • Endocytosis
  • Disease Models, Animal
  • Brain
  • Biochemistry & Molecular Biology
  • Apolipoproteins E