1. Clearance of genetic variants of amyloid β peptide by neuronal and non-neuronal cells.
- Author
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Panchal M, El Abida B, Lazar N, Fahy C, Dubost L, Friguet B, and Rholam M
- Subjects
- Amino Acid Sequence, Amyloid beta-Peptides genetics, Animals, CHO Cells, COS Cells, Chlorocebus aethiops, Circular Dichroism, Cricetinae, Cricetulus, Culture Media, Conditioned, Humans, K562 Cells, Kinetics, Molecular Sequence Data, Mutation, Peptide Fragments genetics, Protein Conformation, Rats, Sequence Alignment, Amyloid beta-Peptides chemistry, Amyloid beta-Peptides metabolism, Neurons chemistry, Neurons metabolism, Peptide Fragments chemistry, Peptide Fragments metabolism
- Abstract
The presence of senile plaques in the brain is one of the pathological hallmarks of Alzheimer's disease (AD). The biogenesis and clearance of the amyloid β peptide (A β ), the main component of the lesions, lie at the center of the pathogenesis of AD. In sporadic AD, the increase of A β levels seems to be indicative of failure of clearance mechanisms. We previously showed that the clearance of the wild type A β40 peptide by various neuronal and non-neuronal cells occurs through a same proteolytic process and that A β degradation was primarily dictated by its conformational state (Panchal et al., 2007). To gain further insights on the role of the peptide conformation in the clearance mechanism of A β , two A β40 peptides, known to be associated with amyloid angiopathy (Dutch and Flemish mutations), and the rodent A β40 peptide were catabolized by several cells by using the same experimental approach. The peptide fragments, generated by proteolytic cleavage of substrates in cell supernatants, were identified by LC-MS and the cleavage sites of proteases were deduced. In parallel, conformational states of wild type A β 40 peptide and of the three A β 40 variants were characterized by circular dichroism spectroscopy. We provide data suggesting that discrete conformational changes of A β 40 peptide regulate its clearance rate by neuronal and non-neuronal cells.
- Published
- 2013
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