scholarly journals Tetracycline Treatment Retards the Onset and Slows the Progression of Diabetes in Human Amylin/Islet Amyloid Polypeptide Transgenic Mice

Diabetes ◽  
2009 ◽  
Vol 59 (1) ◽  
pp. 161-171 ◽  
Author(s):  
J. F. Aitken ◽  
K. M. Loomes ◽  
D. W. Scott ◽  
S. Reddy ◽  
A. R.J. Phillips ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Islet Amyloid ◽  
Tetracycline Treatment ◽  
Human Amylin

Human islet amyloid polypeptide accumulates at similar sites in islets of transgenic mice and humans

Diabetes ◽  
1994 ◽  
Vol 43 (5) ◽  
pp. 640-644 ◽  
Author(s):  
E. J. de Koning ◽  
J. W. Hoppener ◽  
J. S. Verbeek ◽  
C. Oosterwijk ◽  
K. L. van Hulst ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

scholarly journals γ-AApeptides–based Small Molecule Ligands That Disaggregate Human Islet Amyloid Polypeptide

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Olapeju Bolarinwa ◽  
Chunpu Li ◽  
Nawal Khadka ◽  
Qi Li ◽  
Yan Wang ◽  
...  
Keyword(s):  
Type Ii Diabetes ◽  
Islet Amyloid Polypeptide ◽  
Typical Feature ◽  
Human Islet ◽  
Type Ii ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Age Related ◽  
Small Molecule Ligands ◽  
Human Amylin

AbstractThe abnormal folding and aggregation of functional proteins into amyloid is a typical feature of many age-related diseases, including Type II diabetes. Growing evidence has revealed that the prevention of aggregate formation in culprit proteins could retard the progression of amyloid diseases. Human Amylin, also known as human islet amyloid polypeptide (hIAPP), is the major factor for categorizing Type II diabetes as an amyloid disease. Specifically, hIAPP has a great aggregation potential, which always results in a lethal situation for the pancreas. Many peptide inhibitors have been constructed from the various segments of the full-length hIAPP peptide; however, only a few have their origin from the screening of combinatorial peptidomimetic library. In this study, based on HW-155, which was previously discovered from a one–bead–one compound (OBOC) library to inhibit Aβ40 aggregation, we investigated eight (8) analogues and evaluated their amyloid-prevention capabilities for inhibiting fibrillization of hIAPP. Characterization studies revealed that all analogues of HW-155, as well as HW-155, were effective inhibitors of the fibril formation by hIAPP.

scholarly journals Loss of perlecan heparan sulfate glycosaminoglycans lowers body weight and decreases islet amyloid deposition in human islet amyloid polypeptide transgenic mice

2019 ◽  
Vol 32 (2) ◽  
pp. 95-102
Author(s):  
Andrew T Templin ◽  
Mahnaz Mellati ◽  
Raija Soininen ◽  
Meghan F Hogan ◽  
Nathalie Esser ◽  
...  
Keyword(s):  
Body Weight ◽  
Transgenic Mice ◽  
Heparan Sulfate ◽  
Islet Amyloid Polypeptide ◽  
Amyloid Deposition ◽  
Secretory Product ◽  
Cell Area ◽  
Β Cell ◽  
Islet Amyloid

Abstract Islet amyloid is a pathologic feature of type 2 diabetes (T2D) that is associated with β-cell loss and dysfunction. These amyloid deposits form via aggregation of the β-cell secretory product islet amyloid polypeptide (IAPP) and contain other molecules including the heparan sulfate proteoglycan perlecan. Perlecan has been shown to bind amyloidogenic human IAPP (hIAPP) via its heparan sulfate glycosaminoglycan (HS GAG) chains and to enhance hIAPP aggregation in vitro. We postulated that reducing the HS GAG content of perlecan would also decrease islet amyloid deposition in vivo. hIAPP transgenic mice were crossed with Hspg2Δ3/Δ3 mice harboring a perlecan mutation that prevents HS GAG attachment (hIAPP;Hspg2Δ3/Δ3), and male offspring from this cross were fed a high fat diet for 12 months to induce islet amyloid deposition. At the end of the study body weight, islet amyloid area, β-cell area, glucose tolerance and insulin secretion were analyzed. hIAPP;Hspg2Δ3/Δ3 mice exhibited significantly less islet amyloid deposition and greater β-cell area compared to hIAPP mice expressing wild type perlecan. hIAPP;Hspg2Δ3/Δ3 mice also gained significantly less weight than other genotypes. When adjusted for differences in body weight using multiple linear regression modeling, we found no differences in islet amyloid deposition or β-cell area between hIAPP transgenic and hIAPP;Hspg2Δ3/Δ3 mice. We conclude that loss of perlecan exon 3 reduces islet amyloid deposition in vivo through indirect effects on body weight and possibly also through direct effects on hIAPP aggregation. Both of these mechanisms may promote maintenance of glucose homeostasis in the setting of T2D.

Differences in amyloid deposition in islets of transgenic mice expressing human islet amyloid polypeptide versus human islets implanted into nude mice

Metabolism ◽  
1999 ◽  
Vol 48 (4) ◽  
pp. 448-454 ◽  
Author(s):  
Gunilla Westermark ◽  
Per Westermark ◽  
Decio L. Eizirik ◽  
Claes Hellerström ◽  
Niles Fox ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Nude Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islets ◽  
Amyloid Deposition ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

Biologically active human islet amyloid polypeptide/amylin in transgenic mice

1997 ◽  
Vol 136 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Karen L van Hulst ◽  
Walter Born ◽  
Roman Muff ◽  
Cor Oosterwijk ◽  
Marinus A Blankenstein ◽  
...  
Keyword(s):  
Biological Activity ◽  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Cell Protein ◽  
Β Cells ◽  
Pancreatic Β Cells ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Human And Mouse

Abstract Objective: Human islet amyloid polypeptide (hIAPP), also named amylin, is a pancreatic β cell protein implicated in the pathogenesis of pancreatic islet amyloid formation and type 2 diabetes mellitus. To study the (patho)physiological roles of hIAPP, we have generated transgenic mice that overexpress hIAPP mRNA, in relation to endogenous mouse IAPP (mIAPP) mRNA, in pancreatic β cells. The biological activity of human and mouse IAPP derived from pancreatic extracts was determined. Methods: Pancreatic and plasma extracts of transgenic and control mice were analyzed by reversedphase high-performance liquid chromatography (HPLC) and radioimmunoassay, yielding a separation of hIAPP from mIAPP. Biological activity of immunoreactive human and mouse IAPP components derived from pancreatic extracts was assessed by calcitonin receptor-mediated stimulation of cyclic AMP accumulation in T47D human breast carcinoma cells. Results: The predominant immunoreactive human and mouse IAPP gene products had the retention times on HPLC analysis of the corresponding synthetic peptides. The ratio of bioactive over immunoreactive hIAPP and mIAPP was 0·93 ±0·18 and 1·19 ±0·56 respectively. In extracts of two plasma pools from 4 transgenic animals, hIAPP was 4·6- to 7-fold more abundant than mIAPP. Conclusion; This study has shown that correctly processed hIAPP produced in transgenic mouse pancreatic β cells exhibits full biological activity. The results validate these transgenic mice for the study of (patho)physiological roles of hIAPP in vivo. European Journal of Endocrinology 136 107–113

Oophorectomy promotes islet amyloid formation in human islet amyloid polypeptide transgenic mice

Diabetes ◽  
2001 ◽  
Vol 50 (Supplement 1) ◽  
pp. S184-S185 ◽  
Author(s):  
R. L. Hull ◽  
B. Verchere ◽  
S. Andrikopoulos ◽  
F. Wang ◽  
J. Vidal ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Amyloid Formation ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

Combination of human tau and islet amyloid polypeptide exacerbates metabolic dysfunction in transgenic mice

2021 ◽  
Author(s):  
Nadeeja Wijesekara ◽  
Rafaella Araujo Gonçalves ◽  
Rosemary Ahrens ◽  
Kathy Ha ◽  
Fernanda G. De Felice ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Metabolic Dysfunction ◽  
Islet Amyloid

Human Islet Amyloid Polypeptide Accumulates at Similar Sites in Islets of Transgenic Mice and Humans

Diabetes ◽  
1994 ◽  
Vol 43 (5) ◽  
pp. 640-644 ◽  
Author(s):  
E. J. P. de Koning ◽  
J. W. M. Hoppener ◽  
J. S. Verbeek ◽  
C. Oosterwijk ◽  
K. L. van Hulst ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide
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