A specific nanobody prevents amyloidogenesis of D76N β2- microglobulin in vitro and modifies its tissue distribution in vivo

Sara Raimondi, Riccardo Porcari, P. Patrizia Mangione, Guglielmo Verona, Julien Marcoux, Sofia Giorgetti, Graham W. Taylor, Stephan Ellmerich, Maurizio Ballico, Stefano Zanini, Els Pardon, Raya Al-Shawi, J. Paul Simons, Alessandra Corazza, Federico Fogolari, Manuela Leri, Massimo Stefani, Monica Bucciantini, Julian D. Gillmore, Philip N. HawkinsMaurizia Valli, Monica Stoppini, Carol V. Robinson, Jan Steyaert, Gennaro Esposito, Vittorio Bellotti

Research output: Contribution to journalArticle

Abstract

Systemic amyloidosis is caused by misfolding and aggregation of globular proteins in vivo for which effective treatments are urgently needed. Inhibition of protein self-aggregation represents an attractive therapeutic strategy. Studies on the amyloidogenic variant of β2-microglobulin, D76N, causing hereditary systemic amyloidosis, have become particularly relevant since fibrils are formed in vitro in physiologically relevant conditions. Here we compare the potency of two previously described inhibitors of wild type β2-microglobulin fibrillogenesis, doxycycline and single domain antibodies (nanobodies). The β2-microglobulin -binding nanobody, Nb24, more potently inhibits D76N β2-microglobulin fibrillogenesis than doxycycline with complete abrogation of fibril formation. In β2-microglobulin knock out mice, the D76N β2-microglobulin/Nb24 pre-formed complex, is cleared from the circulation at the same rate as the uncomplexed protein; however, the analysis of tissue distribution reveals that the interaction with the antibody reduces the concentration of the variant protein in the heart but does not modify the tissue distribution of wild type β2-microglobulin. These findings strongly support the potential therapeutic use of this antibody in the treatment of systemic amyloidosis.

Original languageEnglish (US)
Article number46711
JournalScientific reports
Volume7
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • General

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