DC Field | Value | Language |
---|---|---|
dc.contributor.author | Porter, Meghan R. | ko |
dc.contributor.author | Kochi, Akiko | ko |
dc.contributor.author | Karty, Jonathan A. | ko |
dc.contributor.author | Lim, Mi Hee | ko |
dc.contributor.author | Zaleski, Jeffrey M. | ko |
dc.date.accessioned | 2018-02-21T06:06:31Z | - |
dc.date.available | 2018-02-21T06:06:31Z | - |
dc.date.created | 2018-02-08 | - |
dc.date.created | 2018-02-08 | - |
dc.date.created | 2018-02-08 | - |
dc.date.issued | 2015-02 | - |
dc.identifier.citation | CHEMICAL SCIENCE, v.6, no.2, pp.1018 - 1026 | - |
dc.identifier.issn | 2041-6520 | - |
dc.identifier.uri | http://hdl.handle.net/10203/240286 | - |
dc.description.abstract | Current approaches toward modulation of metal-induced A beta aggregation pathways involve the development of small molecules that bind metal ions, such as Cu(II) and Zn(II), and interact with Ab. For this effort, we present the enediyne-containing ligand (Z)-N, N'-bis[1-pyridin-2-yl-meth(E)-ylidene]oct-4-ene- 2,6-diyne-1,8-diamine (PyED), which upon chelation of Cu(II) and Zn(II) undergoes Bergmancyclization to yield diradical formation. The ability of this chelation-triggered diradical to modulate Ab aggregation is evaluated relative to the non-radical generating control pyridine-2-ylmethyl(2-{[(pyridine-2-ylmethylene)-amino]-methyl}-benzyl)-amine (PyBD). Variable-pH, ligand UV-vis titrations reveal pK(a) = 3.81(2) for PyBD, indicating it exists mainly in the neutral form at experimental pH. Lipinski's rule parameters and evaluation of blood-brain barrier (BBB) penetration potential by the PAMPA-BBB assay suggest that PyED may be CNS+ and penetrate the BBB. Both PyED and PyBD bind Zn(II) and Cu(II) as illustrated by bathochromic shifts of their UV-vis features. Speciation diagrams indicate that Cu(II)PyBD is the major species at pH 6.6 with a nanomolar K-d, suggesting the ligand may be capable of interacting with Cu(II)-A beta species. In the presence of A beta(40/42) under hyperthermic conditions (43 degrees C), the radical-generating PyED demonstrates markedly enhanced activity (2-24 h) toward the modulation of A beta species as determined by gel electrophoresis. Correspondingly, transmission electron microscopy images of these samples show distinct morphological changes to the fibril structure that are most prominent for Cu(II)-A beta cases. The loss of CO2 from the metal binding region of A beta in MALDI-TOF mass spectra further suggests that metal-ligand-A beta interaction with subsequent radical formation may play a role in the aggregation pathway modulation. | - |
dc.language | English | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.title | Chelation-induced diradical formation as an approach to modulation of the amyloid-beta aggregation pathway | - |
dc.type | Article | - |
dc.identifier.wosid | 000348147100019 | - |
dc.identifier.scopusid | 2-s2.0-84961290051 | - |
dc.type.rims | ART | - |
dc.citation.volume | 6 | - |
dc.citation.issue | 2 | - |
dc.citation.beginningpage | 1018 | - |
dc.citation.endingpage | 1026 | - |
dc.citation.publicationname | CHEMICAL SCIENCE | - |
dc.identifier.doi | 10.1039/c4sc01979b | - |
dc.contributor.localauthor | Lim, Mi Hee | - |
dc.contributor.nonIdAuthor | Porter, Meghan R. | - |
dc.contributor.nonIdAuthor | Kochi, Akiko | - |
dc.contributor.nonIdAuthor | Karty, Jonathan A. | - |
dc.contributor.nonIdAuthor | Zaleski, Jeffrey M. | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | OXYGENATED FENTON CHEMISTRY | - |
dc.subject.keywordPlus | TARGETING A-BETA | - |
dc.subject.keywordPlus | ALZHEIMERS-DISEASE | - |
dc.subject.keywordPlus | BERGMAN CYCLIZATION | - |
dc.subject.keywordPlus | HYDROGEN-PEROXIDE | - |
dc.subject.keywordPlus | MASS-SPECTROMETRY | - |
dc.subject.keywordPlus | AMINO-ACIDS | - |
dc.subject.keywordPlus | DIPHENYLPROPYNONE DERIVATIVES | - |
dc.subject.keywordPlus | PARKINSONS-DISEASES | - |
dc.subject.keywordPlus | RADICAL GENERATION | - |
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