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Current Medicinal Chemistry

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Review Article

Small Molecules with Anti-Prion Activity

Author(s): Carlo Mustazza*, Marco Sbriccoli, Paola Minosi and Carla Raggi

Volume 27, Issue 33, 2020

Page: [5446 - 5479] Pages: 34

DOI: 10.2174/0929867326666190927121744

Price: $65

Abstract

Prion pathologies are fatal neurodegenerative diseases caused by the misfolding of the physiological Prion Protein (PrPC) into a β-structure-rich isoform called PrPSc. To date, there is no available cure for prion diseases and just a few clinical trials have been carried out. The initial approach in the search of anti-prion agents had PrPSc as a target, but the existence of different prion strains arising from alternative conformations of PrPSc, limited the efficacy of the ligands to a straindependent ability. That has shifted research to PrPC ligands, which either act as chaperones, by stabilizing the native conformation, or inhibit its interaction with PrPSc. The role of transition-metal mediated oxidation processes in prion misfolding has also been investigated. Another promising approach is the indirect action via other cellular targets, like membrane domains or the Protein- Folding Activity of Ribosomes (PFAR). Also, new prion-specific high throughput screening techniques have been developed. However, so far no substance has been found to be able to extend satisfactorily survival time in animal models of prion diseases. This review describes the main features of the Structure-Activity Relationship (SAR) of the various chemical classes of anti-prion agents.

Keywords: Prions, transmissible spongiform encephalopathies, scrapie, amyloid, histological dyes, Structure- Activity Relationship (SAR).

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