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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Low-density lipoprotein (LDL) receptor family members play roles in endocytosis, signal transduction, and amyloid precursor protein (APP) processing.
  • Apolipoprotein E Receptor 2 (ApoER2/LRP8) is crucial for synaptic plasticity and is cleaved upon reelin binding, releasing an intracellular domain (ApoER2-ICD).
  • The function of LRP3, a less-studied LDL receptor family member, remains largely unknown.

Purpose of the Study:

  • To investigate whether ApoER2-ICD regulates the expression of other LDL receptors, specifically LRP3.
  • To analyze LRP3 expression in middle-aged (MA) individuals and those with Alzheimer's disease (AD)-related pathology.
  • To determine the relationship between LRP3 and APP processing.

Main Methods:

  • Overexpression of full-length ApoER2 and ApoER2-ICD in SH-SY5Y cells to assess effects on protein levels via microarray, qRT-PCR, and western blot.
  • Analysis of LRP3 mRNA and protein levels in human frontal cortex extracts from MA and AD subjects using qRT-PCR and western blot.
  • Assessment of LRP3 interaction with other proteins via immunoprecipitation and evaluation of APP levels in LRP3-overexpressing CHO cells.

Main Results:

  • ApoER2 and ApoER2-ICD overexpression significantly increased LRP3 expression, even after reelin stimulation.
  • LRP3 mRNA and protein levels were found to be lower in subjects with AD-related pathology compared to MA subjects.
  • LRP3 transfection in CHO cells reduced full-length APP and APP-CTF levels, decreasing secreted APP fragments and Aβ peptides.

Conclusions:

  • ApoER2/reelin signaling modulates LRP3 expression, with altered LRP3 levels observed in Alzheimer's disease.
  • LRP3 plays a role in regulating APP levels, suggesting a potential therapeutic target for AD.