Purified high molecular weight synthetic Aβ(1-42) and biological Aβ oligomers are equipotent in rapidly inducing MTT formazan exocytosis.

Abstract:

:Synthetic soluble Aβ oligomers are often used as a surrogate for biologic material in a number of model systems. We compared the activity of Aβ oligomers (synthetic and cell culture media derived) on the human SH-SY5Y neuroblastoma and C2C12 mouse myoblast cell lines in a novel, modified MTT assay. Separating oligomers from monomeric peptide by size exclusion chromatography produced effects at peptide concentrations approaching physiologic levels (10-100 nM). Purified oligomers, but not monomers or fibrils, elicited an increase of a detergent-insoluble form of MTT formazan within 2h as opposed to a control toxin (H(2)O(2)). This effect was comparable for biological and synthetic peptide in both cell types. Monomeric Aβ attenuated the effect of soluble oligomers. This study suggests that the activities of biological and synthetic oligomers are indistinguishable during early stages of Aβ oligomer-cell interaction.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Weidner AM,Housley M,Murphy MP,Levine H 3rd

doi

10.1016/j.neulet.2011.03.082

subject

Has Abstract

pub_date

2011-06-15 00:00:00

pages

1-5

issue

1

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(11)00406-X

journal_volume

497

pub_type

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