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Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
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Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets
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Published on: May 11, 2015

Islet amyloid polypeptide and diabetes.

Gunilla T Westermark1, Per Westermark

  • 1Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden.

Current Protein & Peptide Science
|June 11, 2013
PubMed
Summary
This summary is machine-generated.

Islet amyloid polypeptide (IAPP) is a hormone linked to type 2 diabetes. Research explores its role in pancreatic cells and the central nervous system, and how it forms amyloid plaques.

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Area of Science:

  • Endocrinology
  • Neuroscience
  • Molecular Biology

Background:

  • Islet amyloid polypeptide (IAPP), also known as amylin, is a hormone primarily produced by pancreatic beta cells.
  • IAPP has diverse experimental effects, with physiological relevance suggested in the central nervous system and pancreatic endocrine cells.
  • High-affinity IAPP receptors, formed by calcitonin receptors and receptor activity-modifying proteins (RAMPs) 1 and 3, are present in these tissues.

Purpose of the Study:

  • To investigate the physiological roles of IAPP in the central nervous system and pancreatic endocrine cells.
  • To understand the regulation of IAPP receptor complex components and downstream signaling pathways.
  • To explore the interplay between IAPP amyloid formation and IAPP receptor complex function.

Main Methods:

  • Identification of IAPP receptor components (calcitonin receptors and RAMPs) in relevant tissues.
  • Investigation of IAPP's effects on cellular function in experimental systems.
  • Analysis of IAPP amyloid formation in pancreatic islets and its potential impact on cellular interactions.

Main Results:

  • IAPP receptors, composed of calcitonin receptors and RAMPs 1 and 3, are identified in the central nervous system and pancreatic endocrine cells.
  • IAPP aggregation into amyloid fibrils is strongly associated with type 2 diabetes and beta cell loss.
  • Amyloid deposition disrupts cellular interactions within pancreatic islets, but the effect on IAPP receptor complexes remains unknown.

Conclusions:

  • IAPP plays a significant role in both endocrine and neural functions, with its receptors being key mediators.
  • The aggregation of IAPP into amyloid is a critical pathological event in type 2 diabetes, leading to beta cell dysfunction.
  • Further research is needed to elucidate the mechanisms of IAPP receptor regulation, signaling, and the reciprocal interactions with IAPP amyloid formation.