P75NTR is mainly responsible for Aβ toxicity but not for its internalization: A primary study

Huanling Yu, Miao Yang, Yanjiang Wang, Rong Xiao, Xin-Fu Zhou

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Accumulating evidence indicates that the intraneuronal accumulation of beta-amyloid peptide (Aβ) is earlier than the formation of extraneuronal amyloid plaque but the mechanism of the accumulation remains unclear. p75NTR is a receptor for Aβ and interacts with Aβ in vitro and in vivo but whether p75NTR mediates Aβ internalization and intraneuronal accumulation is not known. In this study, we aim to determine if p75NTR mediates Aβ internalization, which might provide new insights into Aβ metabolism and toxicity. FRET analysis in PC12 cells showed that internalized Aβ was close to p75NTR. Aβ1-42 could be internalized in PC12 cells in a concentrationdependent manner but the antibody to the p75NTR extracellular domain did not prevent its internalization. Aβ1-42 could also be internalized in mouse neonatal cortical neurons and the deletion of p75NTR in these neurons did not prevent its internalization but prevented Aβ neurotoxicity. Cholesterol at 10 lM significantly increased Aβ1-42 internalization in PC12 cells. Internalized Aβ1-42 is mainly co-localized with Beclin-1 (a biomarker of autophagosomes) but not with endosomal and lysomal markers. p75NTR may not play a main role in Aβ internalization at the concentrations tested but is responsible for Aβ induced toxicity in primary neurons. Internalized Aβ is mainly sorted to autophagosomes for metabolism.

    Original languageEnglish
    Pages (from-to)1043-1050
    Number of pages8
    JournalNeurological Sciences
    Volume33
    Issue number5
    DOIs
    Publication statusPublished - Oct 2012

    Keywords

    • Alzheimer's disease
    • Amyloid beta
    • Cholesterol
    • Endocytosis
    • P75NTR

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