1 resultado para strength and function
em ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha
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Resumo:
Analyses of low density lipoprotein receptor-related protein 1 (LRP1) mutant mouse embryonic fibroblasts (MEFs) generated from LRP1 knock-in mice revealed that inefficient maturation and premature proteasomal degradation of immature LRP1 is causing early embryonic lethality in NPxY1 and NPxY1+2 mutant mice. In MEFs, NPxY2 mutant LRP1 showed efficient maturation but, as expected, decreased endocytosis. The single proximal NPxY1 and the double mutant NPxY1+2 were unable to reach the cell surface as an endocytic receptor due to premature degradation. In conclusion, the proximal NPxY1 motif is essential for early sorting steps in the biosynthesis of mature LRP1.rnThe viable NPxY2 mouse was used to provide genetic evidence for LRP1-mediated amyloid-β (Aβ) transport across the blood-brain barrier (BBB). Here, we show that primary mouse brain capillary endothelial cells (pMBCECs) express functionally active LRP1. Moreover, demonstrate that LRP1 mediates [125I]-Aβ1-40 transcytosis across pMBCECs in both directions, whereas no role for LRP1-mediated Aβ degradation was detected. Aβ transport across pMBCECs generated from NPxY2 knock-in mice revealed a reduced Aβ clearance in both directions compared to WT derived pMBCECs. Finally, we conclude that LRP1 is a bona-fide receptor involved in bidirectional transcytosis of Aβ across the BBB.rn