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. 1995 Mar 14;92(6):1989–1993. doi: 10.1073/pnas.92.6.1989

Amyloid peptides are toxic via a common oxidative mechanism.

D Schubert 1, C Behl 1, R Lesley 1, A Brack 1, R Dargusch 1, Y Sagara 1, H Kimura 1
PMCID: PMC42408  PMID: 7892213

Abstract

beta-Amyloid protein (A beta) is a member of a small group of proteins that accumulate as amyloid deposits in various tissues. It has recently been demonstrated that the toxicity of A beta toward some neural cells is caused by oxidative damage. Since all of the amyloid diseases are characterized by protein deposited in the antiparallel beta-sheet conformation, it was asked whether there is a common toxic mechanism. It is shown here that the protein components of other human amyloidoses, including amylin, calcitonin, and atrial natriuretic peptide, are all toxic to clonal and primary cells. The toxicity is mediated via a free radical pathway indistinguishable from that of A beta. Experiments with synthetic peptides suggest that it is the amphiphilic nature of the peptides generated by their beta structure rather than their beta structure per se that causes toxicity. These results tend to rule out the alternative that amyloid toxicity is exclusively mediated via specific cell surface receptors.

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1989

Selected References

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