Abstract:
:Alzheimer's disease (AD) is a widespread form of dementia that is estimated to affect 44.4 million people worldwide. AD pathology is closely related to the accumulation of amyloid beta (Aβ) peptides in fibrils and plagues, the small oligomeric intermediate species formed during the Aβ peptides aggregation presenting the highest neurotoxicity. This review discusses the recent advances on the Aβ peptides electrochemical characterization. The Aβ peptides oxidation at a glassy carbon electrode occurs in one or two steps, depending on the amino acid sequence, length and content. The first electron transfer reaction corresponds to the tyrosine Tyr10 amino acid residue oxidation, and the second to all three histidine (His6, His13 and His14) and one methionine (Met35) amino acid residues. The Aβ peptides aggregation and amyloid fibril formation are electrochemically detected via the electroactive amino acids oxidation peak currents decrease that occurs in a time dependent manner. The Aβ peptides redox behaviour is correlated with changes in the adsorption morphology from initially random coiled structures, corresponding to the Aβ peptide monomers in random coil or in α-helix conformations, to aggregates, protofibrils and two types of fibrils, corresponding to the Aβ peptides in a β-sheet configuration, observed by atomic force microscopy. Electrochemical studies of Aβ peptides aggregation, mediated by the interaction with metal ions, particularly zinc, copper and iron, and different methodologies concerning the detection of Aβ peptide biomarkers of AD in biological fluids, using electrochemical biosensors, are also discussed.
journal_name
Curr Med Chemjournal_title
Current medicinal chemistryauthors
Chiorcea-Paquim AM,Enache TA,Oliveira-Brett AMdoi
10.2174/0929867325666180214112536subject
Has Abstractpub_date
2018-01-01 00:00:00pages
4066-4083issue
33eissn
0929-8673issn
1875-533Xpii
CMC-EPUB-88567journal_volume
25pub_type
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journal_title:Current medicinal chemistry
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journal_title:Current medicinal chemistry
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journal_title:Current medicinal chemistry
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abstract:BACKGROUND:Chronic Liver Disorders (CLD), caused by the lifestyle patterns like alcoholism or by non-alcoholic fatty liver disease or because of virus-mediated hepatitis, affect a large population fraction across the world. CLD progresses into end-stage diseases with a high mortality rate. Liver transplant is the only ...
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abstract::A series of potential topoisomerase II-mediated anticancer 9-anilinoacridine derivatives, which are designed to avoid bio-oxidation and possessed long duration of drug action, is reviewed. Among these agents, 3-(9-acridinylamino)-5-hydroxymethylaniline (AHMA) derivatives and their alkylcarbamates have been investigate...
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journal_title:Current medicinal chemistry
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journal_title:Current medicinal chemistry
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abstract::Inflammation plays a critical role in the atherosclerotic process in various vascular beds, starting from endothelial dysfunction and counting all stages of plaque development. The significant contribution of inflammation in the initiation and progression of atherosclerosis has been documented over many years but its ...
journal_title:Current medicinal chemistry
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abstract::Physalia physalis is a marine cnidarian from which high molecular weight toxins with hemolytic and neurotoxic effects have been isolated. In the present work, two novel toxins, PpV9.4 and PpV19.3 were purified from P. physalis by bioactive guideline isolation. It involved two steps of column chromatography, gel filtra...
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更新日期:2012-01-01 00:00:00
abstract::Melatonin, a tryptophan-derived neurohormone found in animals, plants, and microbes, participates in various biological and physiological functions. Among other properties, numerous in vitro or in vivo studies have reported its therapeutic potential against many parasites, bacteria and viruses. In this concern, melato...
journal_title:Current medicinal chemistry
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abstract::Dipeptidyl peptidase 4 (DPP-4), a substrate-specific serine protease, has been validated as a promising drug target for the treatment of type 2 diabetes. DPP-4 inhibitors significantly lowered blood glucose levels in patients with type 2 diabetes without common body weight gain, hypoglycemia and gastrointestinal distu...
journal_title:Current medicinal chemistry
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abstract::Glycosaminoglycans, highly charged polycarboxylated, polysulfated polysaccharides, are an important class of therapeutic agents and investigational drug candidates. Heparin has been widely used as a clinical anticoagulant for over 60 years. Low molecular weight heparins have begun to displace heparin and recently a sy...
journal_title:Current medicinal chemistry
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更新日期:2003-10-01 00:00:00