LRP/amyloid beta-peptide interaction mediates differential brain efflux of Abeta isoforms |
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Authors: | Deane Rashid Wu Zhenhua Sagare Abhay Davis Judianne Du Yan Shi Hamm Katie Xu Feng Parisi Margaret LaRue Barbra Hu Hong Wei Spijkers Patricia Guo Huang Song Xiaomei Lenting Peter J Van Nostrand William E Zlokovic Berislav V |
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Institution: | Frank P. Smith Laboratories for Neuroscience and Neurosurgical Research, Department of Neurosurgery, Arthur Kornberg Medical Research Building, University of Rochester Medical Center, Rochester, NY 14642, USA. |
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Abstract: | LRP (low-density lipoprotein receptor-related protein) is linked to Alzheimer's disease (AD). Here, we report amyloid beta-peptide Abeta40 binds to immobilized LRP clusters II and IV with high affinity (Kd = 0.6-1.2 nM) compared to Abeta42 and mutant Abeta, and LRP-mediated Abeta brain capillary binding, endocytosis, and transcytosis across the mouse blood-brain barrier are substantially reduced by the high beta sheet content in Abeta and deletion of the receptor-associated protein gene. Despite low Abeta production in the brain, transgenic mice expressing low LRP-clearance mutant Abeta develop robust Abeta cerebral accumulations much earlier than Tg-2576 Abeta-overproducing mice. While Abeta does not affect LRP internalization and synthesis, it promotes proteasome-dependent LRP degradation in endothelium at concentrations > 1 microM, consistent with reduced brain capillary LRP levels in Abeta-accumulating transgenic mice, AD, and patients with cerebrovascular beta-amyloidosis. Thus, low-affinity LRP/Abeta interaction and/or Abeta-induced LRP loss at the BBB mediate brain accumulation of neurotoxic Abeta. |
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