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Cells and Secretions of the Pancreas

Cells and Secretions of the Pancreas

The pancreas, a vital organ within the abdominal cavity, plays dual roles in the digestive and endocrine systems, collaborating with exocrine and endocrine cells to maintain optimal digestion and blood sugar levels.
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
Concurrently, the dispersed clusters of endocrine cells throughout the...

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are co-secreted in...

Hormones Regulating Blood Glucose

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...

Type I Diabetes II: Pathophysiology

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...

Insulin Secretory Vesicles

Insulin Secretory Vesicles

Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...

Insulin: Biosynthesis, Chemistry, and Preparation

Insulin: Biosynthesis, Chemistry, and Preparation

The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment primarily uses...

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Related Experiment Video

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Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets

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Islet cell function: alpha and beta cells--partners towards normoglycaemia.

¹Department of Internal Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany. burkhard.goeke@med.uni-muenchen.de

International Journal of Clinical Practice. Supplement

|April 9, 2008

Summary

This summary is machine-generated.

In type 2 diabetes mellitus (T2DM), imbalanced insulin and glucagon hormones lead to high blood sugar. Therapies targeting the incretin hormone glucagon-like peptide-1 (GLP-1) show promise for improving glycemic control.

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Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets

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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

Published on: June 25, 2014

Area of Science:

Endocrinology
Metabolic Diseases
Diabetes Research

Background:

Insulin and glucagon are key counter-regulatory hormones maintaining normoglycaemia under normal physiological conditions.
In type 2 diabetes mellitus (T2DM), impaired pancreatic islet function leads to blunted insulin secretion and dysregulated glucagon production, contributing to hyperglycemia.
Structural and functional changes in pancreatic islets, including reduced beta-cell mass and altered beta-cell:alpha-cell ratio, are characteristic of T2DM.

Purpose of the Study:

To explore the role of incretin hormone glucagon-like peptide-1 (GLP-1) in regulating glucose homeostasis.
To investigate how GLP-1 impacts beta-cell insulin and alpha-cell glucagon secretion in the context of T2DM.
To evaluate the therapeutic potential of GLP-1-based therapies for correcting hormonal imbalances in T2DM.

Main Methods:

Analysis of hormonal regulation in normal versus T2DM states.
Investigation of pancreatic islet cell function and structure.
Review of existing and emerging GLP-1-based therapeutic strategies.

Main Results:

T2DM is characterized by impaired insulin and glucagon responses to glucose, leading to hyperglucagonaemia and hyperglycemia.
Structural changes in pancreatic islets contribute to the hormonal dysregulation observed in T2DM.
GLP-1 plays a crucial role in glucose-dependent regulation of insulin and glucagon secretion.

Conclusions:

GLP-1-based therapies offer a promising approach to address the hormonal imbalances in T2DM.
These therapies may restore more balanced insulin and glucagon actions, leading to improved glycemic control.
Understanding the intricate roles of insulin, glucagon, and GLP-1 is vital for advancing T2DM treatment.