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Title: Light Chain Amyloid Fibrils Cause Metabolic Dysfunction in Human Cardiomyocytes

Journal Article · · PLoS ONE
 [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [4];  [4];  [5];  [6]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Medicine
  2. Mayo Clinic, rochester, MN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nutrition
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division
  5. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Medicine; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Radiology
  6. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Medicine; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Radiology

Light chain (AL) amyloidosis is the most common form of systemic amyloid disease, and cardiomyopathy is a dire consequence, resulting in an extremely poor prognosis. AL is characterized by the production of monoclonal free light chains that deposit as amyloid fibrils principally in the heart, liver, and kidneys causing organ dysfunction. We have studied the effects of amyloid fibrils, produced from recombinant λ6 light chain variable domains, on metabolic activity of human cardiomyocytes. The data indicate that fibrils at 0.1 μM, but not monomer, significantly decrease the enzymatic activity of cellular NAD(P)H-dependent oxidoreductase, without causing significant cell death. The presence of amyloid fibrils did not affect ATP levels; however, oxygen consumption was increased and reactive oxygen species were detected. Confocal fluorescence microscopy showed that fibrils bound to and remained at the cell surface with little fibril internalization. Ultimately, these data indicate that AL amyloid fibrils severely impair cardiomyocyte metabolism in a dose dependent manner. These data suggest that effective therapeutic intervention for these patients should include methods for removing potentially toxic amyloid fibrils.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; R01DK079984
OSTI ID:
1260653
Alternate ID(s):
OSTI ID: 1265825
Journal Information:
PLoS ONE, Vol. 10, Issue 9; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (12)

Light chain amyloidosis induced inflammatory changes in cardiomyocytes and adipose-derived mesenchymal stromal cells journal December 2019
Cryo-EM structure of a light chain-derived amyloid fibril from a patient with systemic AL amyloidosis journal March 2019
Immunoglobulin light chain amyloid aggregation journal January 2018
Bifunctional amyloid-reactive peptide promotes binding of antibody 11-1F4 to diverse amyloid types and enhances therapeutic efficacy journal October 2018
Inter-assay variability in automated serum free light chain assays and their use in the clinical laboratory journal October 2019
2A4 binds soluble and insoluble light chain aggregates from AL amyloidosis patients and promotes clearance of amyloid deposits by phagocytosis journal July 2016
A functional assay to identify amyloidogenic light chains journal March 2018
What is new in diagnosis and management of light chain amyloidosis? journal July 2016
Small molecule probes of protein aggregation journal August 2017
Immunoglobulin Light Chains Form an Extensive and Highly Ordered Fibril Involving the N- and C-Termini journal February 2017
Understanding co-polymerization in amyloid formation by direct observation of mixed oligomers journal January 2017
Differential recruitment efficacy of patient-derived amyloidogenic and myeloma light chain proteins by synthetic fibrils—A metric for predicting amyloid propensity journal March 2017

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