Reelin depletion in the entorhinal cortex of human amyloid precursor protein transgenic mice and humans with Alzheimer's disease

J Neurosci. 2007 Mar 14;27(11):2727-33. doi: 10.1523/JNEUROSCI.3758-06.2007.

Abstract

Reelin regulates nervous system development and modulates synaptic plasticity in the adult brain. Several findings suggest that alterations in Reelin signaling may contribute to neuronal dysfunction associated with Alzheimer's disease (AD). Cell surface receptors for Reelin, including integrins and very-low-density lipoprotein receptor/apolipoprotein E2 receptor, may be targets of amyloid-beta (Abeta) peptides presumed to play key roles in the pathogenesis of AD. Reelin also regulates the extent of tau phosphorylation. Finally, increased amounts of Reelin fragments have been found in CSF from AD patients, suggesting altered processing of Reelin. We therefore hypothesized that Reelin levels might be altered in the brains of human amyloid precursor protein (hAPP) transgenic mice, particularly in brain regions vulnerable to AD such as hippocampus and entorhinal cortex. Compared with nontransgenic controls, hAPP mice had significantly fewer Reelin-expressing pyramidal cells in the entorhinal cortex, the major population of glutamatergic neurons expressing Reelin in the brain. Western blot analysis of the hippocampus, which receives projections from the entorhinal cortex, revealed significant reductions in Reelin levels. In contrast, the number of Reelin-expressing GABAergic interneurons was not altered in either the entorhinal cortex or the hippocampus. Thus, neuronal expression of hAPP/Abeta is sufficient to reduce Reelin expression in a specific population of entorhinal cortical pyramidal neurons in vivo. Underscoring the relevance of these findings, we found qualitatively similar reductions of Reelin-expressing pyramidal neurons in the entorhinal cortex of AD brains. We conclude that alterations in Reelin processing or signaling may be involved in AD-related neuronal dysfunction.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alzheimer Disease / genetics
  • Alzheimer Disease / metabolism*
  • Alzheimer Disease / pathology
  • Amyloid beta-Protein Precursor / biosynthesis
  • Amyloid beta-Protein Precursor / genetics*
  • Animals
  • Cell Adhesion Molecules, Neuronal / deficiency*
  • Cell Adhesion Molecules, Neuronal / genetics*
  • Cell Adhesion Molecules, Neuronal / physiology
  • Entorhinal Cortex / metabolism*
  • Entorhinal Cortex / pathology
  • Extracellular Matrix Proteins / deficiency*
  • Extracellular Matrix Proteins / genetics*
  • Extracellular Matrix Proteins / physiology
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Nerve Tissue Proteins / deficiency*
  • Nerve Tissue Proteins / genetics*
  • Nerve Tissue Proteins / physiology
  • Neurons / pathology
  • Protein Processing, Post-Translational / genetics
  • Pyramidal Cells / metabolism
  • Pyramidal Cells / pathology
  • Serine Endopeptidases / deficiency*
  • Serine Endopeptidases / genetics*
  • Serine Endopeptidases / physiology
  • Signal Transduction / genetics

Substances

  • Amyloid beta-Protein Precursor
  • Cell Adhesion Molecules, Neuronal
  • Extracellular Matrix Proteins
  • Nerve Tissue Proteins
  • Serine Endopeptidases
  • reelin protein