Abstract:
PURPOSE:To identify the molecules responsible for amyloid beta-peptide (1-40) (Abeta(1-40)) uptake by the liver, which play a major role in the systemic clearance of Abeta(1-40). METHODS:The liver uptake index method was used to examine the mechanisms of Abeta(1-40) uptake by the liver in vivo. RESULTS:[125I]Abeta(1-40) uptake by the rat liver was concentration-dependent (50% saturation concentration = 302 nM). The inhibitory spectrum of Abeta fragments indicated that 17-24 in Abeta (LVFFAEDV) was the putative sequence responsible for hepatic Abeta(1-40) uptake. Receptor-associated protein (RAP) inhibited [125I]Abeta(1-40) uptake by 48%. RAP-deficient mice, in which low-density lipoprotein receptor-related protein 1 (LRP-1) expression was suppressed, showed a 46% reduction in [125I]Abeta(1-40) uptake by the liver. siRNA-mediated suppression of LRP-1 expression in the liver resulted in a reduction in [125I]Abeta(1-40) uptake by 64%. Both the expression of LRP-1 in the liver and the hepatic Abeta(1-40) uptake were significantly reduced in 13-month-old rats compared with 7-week-old rats. CONCLUSIONS:LRP-1 is the major receptor responsible for the saturable uptake of plasma free Abeta(1-40) by the liver. Reduction of LRP-1 expression will play a role in the age-related reduction in hepatic Abeta(1-40) clearance.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Tamaki C,Ohtsuki S,Iwatsubo T,Hashimoto T,Yamada K,Yabuki C,Terasaki Tdoi
10.1007/s11095-006-0208-7subject
Has Abstractpub_date
2006-07-01 00:00:00pages
1407-16issue
7eissn
0724-8741issn
1573-904Xjournal_volume
23pub_type
杂志文章abstract:PURPOSE:The specific interactions between three lectin-latex conjugates and different structures of rat intestinal mucosa have been studied ex vivo. METHODS:These systems were prepared by covalent coupling of different ligands, i.e., tomato lectin (TL), asparagus pea lectin (AL), mycoplasma gallisepticum lectin (ML), ...
journal_title:Pharmaceutical research
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journal_title:Pharmaceutical research
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更新日期:2011-12-01 00:00:00
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