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Journal articles
Lipid rafts and clathrin cooperate in the internalization of PrP in epithelial FRT cells.
Abstract : The cellular prion protein (PrP(C)) plays a key role in the pathogenesis of Transmissible Spongiform Encephalopathies in which the protein undergoes post-translational conversion to the infectious form (PrP(Sc)). Although endocytosis appears to be required for this conversion, the mechanism of PrP(C) internalization is still debated, as caveolae/raft- and clathrin-dependent processes have all been reported to be involved. METHODOLOGY/PRINCIPAL FINDINGS: We have investigated the mechanism of PrP(C) endocytosis in Fischer Rat Thyroid (FRT) cells, which lack caveolin-1 (cav-1) and caveolae, and in FRT/cav-1 cells which form functional caveolae. We show that PrP(C) internalization requires activated Cdc-42 and is sensitive to cholesterol depletion but not to cav-1 expression suggesting a role for rafts but not for caveolae in PrP(C) endocytosis. PrP(C) internalization is also affected by knock down of clathrin and by the expression of dominant negative Eps15 and Dynamin 2 mutants, indicating the involvement of a clathrin-dependent pathway. Notably, PrP(C) co-immunoprecipitates with clathrin and remains associated with detergent-insoluble microdomains during internalization thus indicating that PrP(C) can enter the cell via multiple pathways and that rafts and clathrin cooperate in its internalization. CONCLUSIONS/SIGNIFICANCE: These findings are of particular interest if we consider that the internalization route/s undertaken by PrP(C) can be crucial for the ability of different prion strains to infect and to replicate in different cell lines.
Cited literature [81 references]
https://hal-pasteur.archives-ouvertes.fr/pasteur-00396868
Contributor : Marie Lemesle Connect in order to contact the contributor
Submitted on : Tuesday, June 23, 2009 - 3:16:36 PM
Last modification on : Tuesday, October 19, 2021 - 10:28:49 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 5:46:05 PM
Contributor : Marie Lemesle Connect in order to contact the contributor
Submitted on : Tuesday, June 23, 2009 - 3:16:36 PM
Last modification on : Tuesday, October 19, 2021 - 10:28:49 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 5:46:05 PM
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journal_1_.pone.0005829.pdf
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