Amyloid peptide channels: Blockade by zinc and inhibition by Congo red (amyloid channel block)
| Autor: | Wendy W. Yiu, Bruce L. Kagan, Andrew Yamamoto, Yutaka Hirakura |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Amyloid
Prions Lipid Bilayers Amylin Peptide Models Biological Ion Channels Protein Structure Secondary Amyloid disease chemistry.chemical_compound mental disorders Internal Medicine Humans Magnesium Senile plaques Phospholipids chemistry.chemical_classification Ion Transport Chemistry P3 peptide Congo Red Peptide Fragments Islet Amyloid Polypeptide Biochemistry of Alzheimer's disease Congo red Zinc Biochemistry Biophysics Calcium |
| Zdroj: | Amyloid. 7:194-199 |
| ISSN: | 1744-2818 1350-6129 |
| Popis: | Amyloid peptides are the major constituents of amyloid deposits in various amyloid diseases including Alzheimer's disease, type II diabetes mellitus, prion diseases and others. The hallmark of amyloid is the binding of the dye, Congo red, which creates characteristic staining due to the dye's ability to bind the beta sheet aggregates referred to as amyloid. Previous reports have demonstrated that several cytotoxic, amyloidogenic peptides can form ion channels in planar phospholipid bilayer membranes and have suggested that these channels may represent the pathogenic mechanism of cell and tissue destruction in amyloid disease. Furthermore, zinc and Congo red can ameliorate or prevent the pathogenic effect of certain amyloidpeptides. We report here that zinc at micromolar concentrations caused a reversible blockade of islet amyloid polypeptide (IAPP, amylin) and PrP 106-126 channels whereas calcium and magnesium did not. Congo red completely inhibited channel formation if preincubated with amyloid peptides, but had no effect on IAPP or PrP 106-126 channels once formed. These results suggest a requirement for aggregation for the formation of amyloid peptide channels and are consistent with the "channel hypothesis" of amyloid disease. They also suggest potential avenues for ameliorative therapy of these illnesses. |
| Databáze: | OpenAIRE |
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