scholarly journals Graphene quantum dots against human IAPP aggregation and toxicity in vivo

Nanoscale ◽  
2018 ◽  
Vol 10 (42) ◽  
pp. 19995-20006 ◽  
Author(s):  
Miaoyi Wang ◽  
Yunxiang Sun ◽  
Xueying Cao ◽  
Guotao Peng ◽  
Ibrahim Javed ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Islet Amyloid Polypeptide ◽  
Graphene Quantum Dots ◽  
Human Islet ◽  
Zebrafish Embryos ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

Graphene quantum dots are biocompatible zero-dimensional nanostructures, which displayed a potency in rescuing zebrafish embryos from the toxicity of human islet amyloid polypeptide.

scholarly journals Graphene quantum dots rescue protein dysregulation of pancreatic β-cells exposed to human islet amyloid polypeptide

Nano Research ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2827-2834 ◽  
Author(s):  
Ava Faridi ◽  
Yunxiang Sun ◽  
Monika Mortimer ◽  
Ritchlynn R. Aranha ◽  
Aparna Nandakumar ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Islet Amyloid Polypeptide ◽  
Graphene Quantum Dots ◽  
Human Islet ◽  
Β Cells ◽  
Pancreatic Β Cells ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

scholarly journals Human Islet Amyloid Polypeptide Fibril Binding to Catalase: A Transmission Electron Microscopy and Microplate Study

2010 ◽  
Vol 10 ◽  
pp. 879-893 ◽  
Author(s):  
Nathaniel G. N. Milton ◽  
J. Robin Harris
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Islet Amyloid Polypeptide ◽  
Amyloid Β ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Transmission Electron

The diabetes-associated human islet amyloid polypeptide (IAPP) is a 37-amino-acid peptide that forms fibrilsin vitroandin vivo. Human IAPP fibrils are toxic in a similar manner to Alzheimer's amyloid-β (Aβ) and prion protein (PrP) fibrils. Previous studies have shown that catalase binds to Aβ fibrils and appears to recognize a region containing the Gly-Ala-Ile-Ile sequence that is similar to the Gly-Ala-Ile-Leu sequence found in human IAPP residues 24-27. This study presents a transmission electron microscopy (TEM)—based analysis of fibril formation and the binding of human erythrocyte catalase to IAPP fibrils. The results show that human IAPP 1-37, 8-37, and 20-29 peptides form fibrils with diverse and polymorphic structures. All three forms of IAPP bound catalase, and complexes of IAPP 1-37 or 8-37 with catalase were identified by immunoassay. The binding of biotinylated IAPP to catalase was high affinity with a KDof 0.77nM, and could be inhibited by either human or rat IAPP 1-37 and 8-37 forms. Fibrils formed by the PrP 118-135 peptide with a Gly-Ala-Val-Val sequence also bound catalase. These results suggest that catalase recognizes a Gly-Ala-Ile-Leu—like sequence in amyloid fibril-forming peptides. For IAPP 1-37 and 8-37, the catalase binding was primarily directed towards fibrillar rather than ribbon-like structures, suggesting differences in the accessibility of the human IAPP 24-27 Gly-Ala-Ile-Leu region. This suggests that catalase may be able to discriminate between different structural forms of IAPP fibrils. The ability of catalase to bind IAPP, Aβ, and PrP fibrils demonstrates the presence of similar accessible structural motifs that may be targets for antiamyloid therapeutic development.

Human islet amyloid polypeptide (hIAPP) - a curse in type II diabetes mellitus: insights from structure and toxicity studies

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ajit Kumar Bishoyi ◽  
Pratiksha H. Roham ◽  
Kavitha Rachineni ◽  
Shreyada Save ◽  
M. Asrafuddoza Hazari ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Islet Amyloid Polypeptide ◽  
Peptide Hormone ◽  
Type Ii Diabetes Mellitus ◽  
Human Islet ◽  
Random Structure ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Toxicity Studies

AbstractThe human islet amyloid polypeptide (hIAPP) or amylin, a neuroendocrine peptide hormone, is known to misfold and form amyloidogenic aggregates that have been observed in the pancreas of 90% subjects with Type 2 Diabetes Mellitus (T2DM). Under normal physiological conditions, hIAPP is co-stored and co-secreted with insulin; however, under chronic hyperglycemic conditions associated with T2DM, the overexpression of hIAPP occurs that has been associated with the formation of amyloid deposits; as well as the death and dysfunction of pancreatic β-islets in T2DM. Hitherto, various biophysical and structural studies have shown that during this process of aggregation, the peptide conformation changes from random structure to helix, then to β-sheet, subsequently to cross β-sheets, which finally form left-handed helical aggregates. The intermediates, formed during this process, have been shown to induce higher cytotoxicity in the β-cells by inducing cell membrane disruption, endoplasmic reticulum stress, mitochondrial dysfunction, oxidative stress, islet inflammation, and DNA damage. As a result, several research groups have attempted to target both hIAPP aggregation phenomenon and the destabilization of preformed fibrils as a therapeutic intervention for T2DM management. In this review, we have summarized structural aspects of various forms of hIAPP viz. monomer, oligomers, proto-filaments, and fibrils of hIAPP. Subsequently, cellular toxicity caused by toxic conformations of hIAPP has been elaborated upon. Finally, the need for performing structural and toxicity studies in vivo to fill in the gap between the structural and cellular aspects has been discussed.

scholarly journals Amyloid Formation in Response to β Cell Stress Occurs In Vitro, but Not In Vivo, in Islets of Transgenic Mice Expressing Human Islet Amyloid Polypeptide

1995 ◽  
Vol 1 (5) ◽  
pp. 542-553 ◽  
Author(s):  
Gunilla Westermark ◽  
Michelle Benig Arora ◽  
Niles Fox ◽  
Raymond Carroll ◽  
Shu Jin Chan ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Cell Stress ◽  
Amyloid Formation ◽  
Β Cell ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

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 The flanking peptides issue from the maturation of the human islet amyloid polypeptide (hIAPP) slightly modulate hIAPP-fibril formation but not hIAPP-induced cell death

Biochimie ◽  
2020 ◽  
Vol 170 ◽  
pp. 26-35 ◽  
Author(s):  
Shadai Salazar Vazquez ◽  
Bertrand Blondeau ◽  
Pierre Cattan ◽  
Mathieu Armanet ◽  
Ghislaine Guillemain ◽  
...  
Keyword(s):  
Cell Death ◽  
Islet Amyloid Polypeptide ◽  
Fibril Formation ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

scholarly journals Regulation of divalent metal ions to the aggregation and membrane damage of human islet amyloid polypeptide oligomers

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12815-12825
Author(s):  
Yajie Wang ◽  
Feihong Meng ◽  
Tong Lu ◽  
Chunyun Wang ◽  
Fei Li
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Membrane Damage ◽  
Islet Amyloid Polypeptide ◽  
Divalent Metal ◽  
Human Islet ◽  
Divalent Metal Ions ◽  
Islet Amyloid ◽  
Induced Membrane ◽  
Human Islet Amyloid Polypeptide

Their is a counteraction between a decrease in the disruptive ability of metal-associated oligomer species and an increase in the quantity of oligomers promoted by the metal binding in the activity of hIAPP induced membrane damage.

scholarly journals Interactions of human islet amyloid polypeptide with lipid structure of different curvatures

2020 ◽  
Vol 10 (6) ◽  
pp. 412-418
Author(s):  
Le Mei ◽  
Wenhui Shen ◽  
Xuwei Wu ◽  
Jie Liu ◽  
Dechang Li ◽  
...  
Keyword(s):  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Lipid Structure ◽  
Human Islet Amyloid Polypeptide

scholarly journals Amyloidogenicity and Cytotoxicity of Recombinant Mature Human Islet Amyloid Polypeptide (rhIAPP)

2004 ◽  
Vol 279 (41) ◽  
pp. 42803-42810 ◽  
Author(s):  
Dahabada H. J. Lopes ◽  
Christian Colin ◽  
Theri L. Degaki ◽  
Ana Christina V. de Sousa ◽  
Marcelo N. N. Vieira ◽  
...  
Keyword(s):  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide
Sign in / Sign up

Export Citation Format

Share Document