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Charged bipolar suramin derivatives induce aggregation of the prion protein at the cell surface and inhibit PrPSc replication.

Abstract：

:The conversion of the cellular prion protein (PrPc) into a pathogenic isoform (PrP(Sc)) is one of the underlying events in the pathogenesis of the fatal transmissible spongiform encephalopathies (TSEs). Numerous compounds have been described to inhibit prion replication and PrP(Sc) accumulation in cell culture. Among these, the drug suramin induces aggregation and re-targeting of PrPc to endocytic compartments. Plasma membrane and sites of conversion into PrP(Sc) are thereby bypassed. In the present study, a library of suramin analogues was tested as a potential class of new anti-prion compounds and the molecular mechanisms underlying these effects were analysed. Treatment of prion-infected neuroblastoma cells with compounds containing symmetrical aromatic sulfonic acid substitutions inhibited de novo synthesis of PrP(Sc) and induced aggregation and reduction of the half-life of PrPc without downregulating PrPc cell surface expression. Half-molecule compounds lacking the symmetrical bipolar structure or the anionic groups had no effect on PrP(Sc) synthesis or PrPc solubility. Cell surface expression of PrPc was necessary for the activity of effective compounds. Suramin derivatives did not induce aggregation of PrPc when transport along the secretory pathway was compromised, suggesting that their effects occur at a post trans-Golgi network (TGN) site, possibly close to the compartment of conversion into PrP(Sc). In vitro studies with recombinant PrP demonstrated that the inhibitory effect correlated with direct binding to PrP and induction of insoluble PrP aggregates. Our data reveal an anti-prion effect that differs from those characterising other sulphated polyanions and is dependent on the presence of the symmetrical anionic structure of these molecules.

journal_name

J Cell Sci

journal_title

Journal of cell science

authors

Nunziante M,Kehler C,Maas E,Kassack MU,Groschup M,Schätzl HM

doi

10.1242/jcs.02609

keywords:

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

4959-73

issue

Pt 21

eissn

0021-9533

issn

1477-9137

pii

jcs.02609

journal_volume

118

pub_type

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Charged bipolar suramin derivatives induce aggregation of the prion protein at the cell surface and inhibit PrPSc replication.