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Research article - Peer-reviewed, 2021

Enhanced detection of ATTR amyloid using a nanofibril-based assay

Rahman, M. Mahafuzur; Schmuck, Benjamin; Hansson, Henrik; Hard, Torleif; Westermark, Gunilla T.; Sandgren, Mats;

Abstract

More than 30 proteins and peptides have been found to form amyloid fibrils in human diseases. Fibrils formed by transthyretin (TTR) are associated with ATTR amyloidosis, affecting many vital organs, including the heart and peripheral nervous system. Congo red staining is the gold standard method for detection of amyloid deposits in tissue. However, Congo red staining and amyloid typing methods such as immunofluorescence labelling are limited to relatively large deposits. Detection of small ATTR deposits present at an early stage of the disease could enable timely treatment and prevent severe tissue damage. In this study, we developed an enhanced ATTR amyloid detection method that uses functionalised protein nanofibrils. Using this method, we achieved sensitive detection of monomeric TTR in a microplate immunoassay and immunofluorescence labelling of ex vivo tissue from two patients containing ATTR aggregates. The system's utility was confirmed on sections from a patient with AA amyloidosis and liver sections from inflamed mouse. These results suggest that the detection system constitutes important new technology for highly sensitive detection of microscopic amounts of ATTR amyloid deposited in tissue.

Keywords

ATTR amyloid; AA amyloid; enhanced detection; functional protein nanofibril; immunoassay

Published in

Amyloid

2021, volume: 28, number: 3, pages: 158-167
Publisher: TAYLOR AND FRANCIS LTD

Authors' information

Rahman, Mahafuzur
Swedish University of Agricultural Sciences, Department of Molecular Sciences
Swedish University of Agricultural Sciences, Department of Molecular Sciences
Swedish University of Agricultural Sciences, Department of Molecular Sciences
Swedish University of Agricultural Sciences, Department of Molecular Sciences
Westermark, Gunilla T.
Uppsala University
Swedish University of Agricultural Sciences, Department of Molecular Sciences

UKÄ Subject classification

Biomedical Laboratory Science/Technology

Publication Identifiers

DOI: https://doi.org/10.1080/13506129.2021.1886072

URI (permanent link to this page)

https://res.slu.se/id/publ/110983