Calcium-activated membrane interaction of the islet amyloid polypeptide: Implications in the pathogenesis of type II diabetes mellitus

2008 ◽  
Vol 477 (2) ◽  
pp. 291-298 ◽  
Author(s):  
Michele F.M. Sciacca ◽  
Matteo Pappalardo ◽  
Danilo Milardi ◽  
Domenico M. Grasso ◽  
Carmelo La Rosa
Keyword(s):  
Diabetes Mellitus ◽  
Type Ii Diabetes ◽  
Islet Amyloid Polypeptide ◽  
Type Ii Diabetes Mellitus ◽  
Type Ii ◽  
Islet Amyloid ◽  
Membrane Interaction

Amyloid protein in somatostatinoma differs from human islet amyloid polypeptide

1991 ◽  
Vol 124 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Haruhiko Ohsawa ◽  
Azuma Kanatsuka ◽  
Yoshiharu Tokuyama ◽  
Takahide Yamaguchi ◽  
Hideichi Makino ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Type Ii Diabetes ◽  
Islet Amyloid Polypeptide ◽  
Type Ii Diabetes Mellitus ◽  
Pancreatic Tissue ◽  
Type Ii ◽  
Pancreatic Hormones ◽  
Islet Amyloid ◽  
Electron Microscopic ◽  
Amyloid Deposits

Abstract. Amyloid deposits in somatostatinomas are rare observations. To examine the characteristics of this amyloid, we compared amyloid deposits in a somatostatinoma to those found in pancreatic tissue in patients with Type II diabetes mellitus and in insulinomas, using immunohistochemical techniques and specific antibodies to islet amyloid polypeptide or other pancreatic hormones, as well as electron-microscopy. Antibodies to islet amyloid polypeptide regions 8-17 or 25-37 were confirmed to be specific. Amyloid deposits in patients with Type II diabetes mellitus and in insulinomas, but not those in the somatostatinoma strongly reacted with these antibodies, or to an antibody to amyloid P component. Amyloid deposits in the somatostatinoma were not reactive with antibodies to somatostatin or to other pancreatic hormones. Electron-microscopic examinations revealed that amyloid fibrils in the somatostatinoma were thinner and more randomly distributed than were those in islets from patients with Type II diabetes mellitus. As amyloid in somatostatinomas is unlike that consisting of islet amyloid polypeptide or other mature pancreatic hormones, it may be a novel type of local amyloid in pancreatic islets.

scholarly journals Brazilin inhibits fibrillogenesis of human islet amyloid polypeptide, disassembles mature fibrils, and alleviates cytotoxicity

RSC Advances ◽  
2017 ◽  
Vol 7 (69) ◽  
pp. 43491-43501 ◽  
Author(s):  
Jingjing Guo ◽  
Wanqi Sun ◽  
Li Li ◽  
Fufeng Liu ◽  
Wenyu Lu
Keyword(s):  
Diabetes Mellitus ◽  
Molecular Simulation ◽  
Type Ii Diabetes ◽  
Islet Amyloid Polypeptide ◽  
Type Ii Diabetes Mellitus ◽  
Inhibitory Effect ◽  
Human Islet ◽  
Type Ii ◽  
Islet Amyloid ◽  
Simulation Experiments

Inhibitory effect of brazilin on the fibrillogenesis of hIAPP was explored using biochemical, biophysical, cytobiological and molecular simulation experiments. Brazilin was a potential compound for therapeutic treatment of type II diabetes mellitus.

scholarly journals Influence of a curcumin derivative on hIAPP aggregation in the absence and presence of lipid membranes

2016 ◽  
Vol 52 (5) ◽  
pp. 942-945 ◽  
Author(s):  
Amit S. Pithadia ◽  
Anirban Bhunia ◽  
Rajendran Sribalan ◽  
Vediappen Padmini ◽  
Carol A. Fierke ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Lipid Membranes ◽  
Type Ii Diabetes ◽  
Islet Amyloid Polypeptide ◽  
Type Ii Diabetes Mellitus ◽  
Human Islet ◽  
Type Ii ◽  
Β Cells ◽  
Islet Amyloid ◽  
Curcumin Derivative

The deposition of aggregates of human islet amyloid polypeptide (hIAPP) has been correlated with the death of β-cells in type II diabetes mellitus.

scholarly journals Mechanistic Contributions of Biological Cofactors in Islet Amyloid Polypeptide Amyloidogenesis

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Phuong Trang Nguyen ◽  
Nagore Andraka ◽  
Carole Anne De Carufel ◽  
Steve Bourgault
Keyword(s):  
Type Ii Diabetes ◽  
Amyloid Fibrils ◽  
Driving Forces ◽  
Islet Amyloid Polypeptide ◽  
Type Ii Diabetes Mellitus ◽  
Major Protein ◽  
Local Concentration ◽  
Amyloid Formation ◽  
Type Ii ◽  
Islet Amyloid

Type II diabetes mellitus is associated with the deposition of fibrillar aggregates in pancreatic islets. The major protein component of islet amyloids is the glucomodulatory hormone islet amyloid polypeptide (IAPP). Islet amyloid fibrils are virtually always associated with several biomolecules, including apolipoprotein E, metals, glycosaminoglycans, and various lipids. IAPP amyloidogenesis has been originally perceived as a self-assembly homogeneous process in which the inherent aggregation propensity of the peptide and its local concentration constitute the major driving forces to fibrillization. However, over the last two decades, numerous studies have shown a prominent role of amyloid cofactors in IAPP fibrillogenesis associated with the etiology of type II diabetes. It is increasingly evident that the biochemical microenvironment in which IAPP amyloid formation occurs and the interactions of the polypeptide with various biomolecules not only modulate the rate and extent of aggregation, but could also remodel the amyloidogenesis process as well as the structure, toxicity, and stability of the resulting fibrils.

scholarly journals Extensive islet amyloid formation is induced by development of Type II diabetes mellitus and contributes to its progression: pathogenesis of diabetes in a mouse model

Diabetologia ◽  
1999 ◽  
Vol 42 (4) ◽  
pp. 427-434 ◽  
Author(s):  
J. W. M. Höppener ◽  
C. Oosterwijk ◽  
M. G. Nieuwenhuis ◽  
G. Posthuma ◽  
J. H. H. Thijssen ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Mouse Model ◽  
Type Ii Diabetes ◽  
Type Ii Diabetes Mellitus ◽  
Amyloid Formation ◽  
Type Ii ◽  
Islet Amyloid
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