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PublicationIn vitro antiamyloidogenic properties of 1,4-naphthoquinones( 2010-09-01)
;Bermejo-Bescós P. ;Martín-Aragón S. ;Ortega A. ;Molina M.T. ;Buxaderas E. ;Orellana G.Csákÿ A.G.The aim of this study is to find out whether several 1,4-naphthoquinones (1,4-NQ) can interact with the amyloidogenic pathway of the amyloid precursor protein processing, particularly targeting at β-secretase (BACE), as well as at β-amyloid peptide (Aβ) aggregation and disaggregating preformed Aβ fibrils. Compounds bearing hydroxyl groups at the quinoid (2) or benzenoid rings (5, 6) as well as some 2- and 3-aryl derivatives (11-15) showed BACE inhibitory activity, without effect on amyloid aggregation or disaggregation. The halogenated compounds 8 and 10 were selective for the inhibition of amyloid aggregation. On the other hand, 1,4-naphthoquinone (1), 6-hydroxy-1,4-naphthoquinone (4) and 2-(3,4-dichlorophenyl)-1,4-naphthoquinone (26) did not show any BACE inhibitory activity but were active on amyloid aggregation and disaggregation preformed Aβ fibrils. Juglone (5-hydroxy-1,4-naphthoquinone (3), and 3-(p-hydroxyphenyl)-5-methoxy-1,4-napththoquinone (19) were active on all the three targets. Therefore, we suggest that 1,4-NQ derivatives, specially 3 and 19, should be explored as possible drug candidates or lead compounds for the development of drugs to prevent amyloid aggregation and neurotoxicity in Alzheimer's disease. © 2010 Elsevier Inc. -
PublicationSpin conversion detected by Mössbauer spectroscopy and μSR on a 1D FeII paramagnetic chain(Kluwer Academic Publishers, 2014-01-01)
;Garcia Y. ;Campbell S.J. ;Lord J.S. ;Dîrtu M.M. ;Vendrell Pérez A. ;Boland Y. ;Ksenofontov V.Gütlich P.While magnetic properties of the 1D chain [Fe(hyetrz)3](4-bromophenylsulfonate)2 investigated over the temperature range from 300 K to 2 K show paramagnetic behavior, detailed 57Fe Mössbauer and muon spin relaxation measurements reveal an unexpected spin conversion. Approximately ~14 % of the high-spin ions are found to convert to the low-spin state with a transition temperature T 1/2 ~ 120 K. © 2013 Springer Science+Business Media Dordrecht.