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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hashimoto, Tadafumi Ohtsuki, Sumio Basak, Jacob M. Tachikawa, Masanori Yabuki, Chiori Liu, Qiang Nagae, Yusuke Holtzman, David M. Bu, Guojun Yamada, Kaoru Iwatsubo, Takeshi Strickland, Dudley K. Terasaki, Tetsuya |
| Description | Author Affiliation: Yamada K ( Department of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 113-0033, Japan.) |
| Abstract | The metabolism of amyloid beta peptide (A beta) in the brain is crucial to the pathogenesis of Alzheimer disease. A body of evidence suggests that A beta is actively transported from brain parenchyma to blood across the blood-brain barrier (BBB), although the precise mechanism remains unclear. To unravel the cellular and molecular mechanism of A beta transport across the BBB, we established a new in vitro model of the initial internalization step of A beta transport using TR-BBB cells, a conditionally immortalized endothelial cell line from rat brain. We show that TR-BBB cells rapidly internalize A beta through a receptor-mediated mechanism. We also provide evidence that A beta internalization is mediated by LRP1 (low density lipoprotein receptor-related protein 1), since administration of LRP1 antagonist, receptor-associated protein, neutralizing antibody, or small interference RNAs all reduced A beta uptake. Despite the requirement of LRP1-dependent internalization, A beta does not directly bind to LRP1 in an in vitro binding assay. Unlike TR-BBB cells, mouse embryonic fibroblasts endogenously expressing functional LRP1 and exhibiting the authentic LRP1-mediated endocytosis (e.g. of tissue plasminogen activator) did not show rapid A beta uptake. Based on these data, we propose that the rapid LRP1-dependent internalization of A beta occurs under the BBB-specific cellular context and that TR-BBB is a useful tool for analyzing the molecular mechanism of the rapid transport of A beta across BBB. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 50 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-12-12 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amyloid Beta-Peptides Chemistry Blood-Brain Barrier Gene Expression Regulation Low Density Lipoprotein Receptor-Related Protein-1 Physiology Receptors, LDL Tumor Suppressor Proteins Pharmacokinetics Animals Brain Metabolism Cell Line, Tumor Collagen Fibroblasts In Vitro Techniques Mice Models, Biological Protein Transport Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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