Overall Sulfation of Heparan Sulfate from Pancreatic Islet β-TC3 Cells Increases Maximal Fibril Formation but Does Not Determine Binding to the Amyloidogenic Peptide Islet Amyloid Polypeptide
| Autor: | Susan Potter Perigo, Christina K. Chan, Thomas N. Wight, Michael J. Peters, Michael G. Kinsella, Rebecca L. Hull |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Amyloid
endocrine system education Glycobiology and Extracellular Matrices Nitrous Acid Peptide macromolecular substances Plasma protein binding Biochemistry Cell Line Mice chemistry.chemical_compound Sulfation Insulin-Secreting Cells mental disorders Carbohydrate Conformation Animals Humans Benzothiazoles Molecular Biology Fluorescent Dyes Polysaccharide-Lyases chemistry.chemical_classification geography geography.geographical_feature_category Cell Biology Heparan sulfate Islet Islet Amyloid Polypeptide carbohydrates (lipids) Thiazoles Immobilized Proteins Heparin Lyase chemistry Cell culture Culture Media Conditioned Chromatography Gel Proteoglycans Heparitin Sulfate Protein Multimerization Beta cell Protein Binding |
| Zdroj: | Journal of Biological Chemistry. 287:37154-37164 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m112.409847 |
| Popis: | Islet amyloid, a pathologic feature of type 2 diabetes, contains the islet β-cell peptide islet amyloid polypeptide (IAPP) as its unique amyloidogenic component. Islet amyloid also contains heparan sulfate proteoglycans (HSPGs) that may contribute to amyloid formation by binding IAPP via their heparan sulfate (HS) chains. We hypothesized that β-cells produce HS that bind IAPP via regions of highly sulfated disaccharides. Unexpectedly, HS from the β-cell line β-TC3 contained fewer regions of highly sulfated disaccharides compared with control normal murine mammary gland (NMuMG) cells. The proportion of HS that bound IAPP was similar in both cell lines (∼65%). The sulfation pattern of IAPP-bound versus non-bound HS from β-TC3 cells was similar. In contrast, IAPP-bound HS from NMuMG cells contained frequent highly sulfated regions, whereas the non-bound material demonstrated fewer sulfated regions. Fibril formation from IAPP was stimulated equally by IAPP-bound β-TC3 HS, non-bound β-TC3 HS, and non-bound NMuMG HS but was stimulated to a greater extent by the highly sulfated IAPP-bound NMuMG HS. Desulfation of HS decreased the ability of both β-TC3 and NMuMG HS to stimulate IAPP maximal fibril formation, but desulfated HS from both cell types still accelerated fibril formation relative to IAPP alone. In summary, neither binding to nor acceleration of fibril formation from the amyloidogenic peptide IAPP is dependent on overall sulfation in HS synthesized by β-TC3 cells. This information will be important in determining approaches to reduce HS-IAPP interactions and ultimately prevent islet amyloid formation and its toxic effects in type 2 diabetes. |
| Databáze: | OpenAIRE |
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