Abstract
Low density lipoprotein receptor-related protein (LRP) polymorphisms have recently been associated with an increased susceptibility of Alzheimer's disease (AD). Furthermore, LRP has been linked to molecules that confer susceptibility to AD (apolipoprotein E, alpha-2-macroglobulin, amyloid precursor protein), previously with the exception of the presenilins. Here we report that aberrant presenilin-1 expression in vivo and in vitro downregulates LRP. Specifically, transgenic mice overexpressing the M146L or L286V presenilin-1 mutation show decreased levels of LRP expression in neuronal populations where presenilin-1 and LRP are closely colocalized or coexpressed. Moreover, cell lines transfected with presenilin-1 also expressed decreased levels of LRP. These findings suggest that LRP may be central to AD pathogenesis since all proteins genetically associated with AD can now be linked via a single pathway to LRP.
Copyright 1999 Academic Press.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Alzheimer Disease / pathology
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Alzheimer Disease / physiopathology*
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Animals
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Crosses, Genetic
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Gene Expression Regulation*
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Hippocampus / cytology
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Hippocampus / metabolism*
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Humans
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Interneurons / cytology
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Interneurons / metabolism
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Low Density Lipoprotein Receptor-Related Protein-1
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Membrane Proteins / analysis
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Membrane Proteins / genetics*
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Membrane Proteins / metabolism
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Mice
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Mice, Inbred C57BL
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Mice, Inbred Strains
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Mice, Transgenic
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Neocortex / cytology
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Neocortex / metabolism*
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Neurons / cytology
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Neurons / metabolism*
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Presenilin-1
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Pyramidal Cells / cytology
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Pyramidal Cells / metabolism
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RNA, Messenger / genetics
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Receptors, Immunologic / analysis
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Receptors, Immunologic / genetics*
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Receptors, LDL / metabolism
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Somatostatin / analysis
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Transcription, Genetic*
Substances
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Low Density Lipoprotein Receptor-Related Protein-1
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Membrane Proteins
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PSEN1 protein, human
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Presenilin-1
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RNA, Messenger
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Receptors, Immunologic
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Receptors, LDL
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Somatostatin