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Related Concept Videos

Insulin Secretory Vesicles01:05

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...
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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...
Cells and Secretions of the Pancreas01:16

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...
Pancreatic Juice and Secretion01:26

Pancreatic Juice and Secretion

Pancreatic juice is a clear fluid produced by the pancreas, containing water, salts, sodium bicarbonate, and enzymes vital for digestion in the small intestine. It helps break down large molecules, facilitating nutrient absorption.
When acidic chyme from the stomach enters the duodenum, it triggers the release of secretin, a hormone that prompts pancreatic juice secretion. After a fatty meal, cholecystokinin, another hormone, stimulates gallbladder contraction and enhances enzyme-rich...
Acute Pancreatitis II: Pathophysiology01:21

Acute Pancreatitis II: Pathophysiology

The pathophysiology of acute pancreatitis centers on injury to pancreatic acinar cells, which initiates a cascade of harmful intracellular events.This injury leads to premature activation of trypsinogen to trypsin in the pancreas. Trypsin then activates other digestive enzymes, such as chymotrypsin, elastase, and phospholipase A2, which begin breaking down pancreatic tissue. The resulting autodigestion causes local inflammation, tissue swelling, hemorrhage, and fat necrosis.Injured acinar cells...
Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...

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Confocal Laser Scanning Microscopy of Calcium Dynamics in Acute Mouse Pancreatic Tissue Slices
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Transepithelial bicarbonate secretion: lessons from the pancreas.

Hyun Woo Park1, Min Goo Lee

  • 1Department of Pharmacology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, Korea.

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Defects in cystic fibrosis transmembrane conductance regulator (CFTR) function impair bicarbonate secretion, leading to thick mucus in organs like the lungs and pancreas. Understanding CFTR

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Area of Science:

  • Cell Physiology
  • Molecular Biology
  • Gastroenterology

Background:

  • Cystic fibrosis transmembrane conductance regulator (CFTR) is crucial for secreting bicarbonate (HCO(3)(-))-rich fluids in various epithelia.
  • Epithelial bicarbonate secretion defects are implicated in cystic fibrosis pathogenesis, causing hyperviscous mucus in the lungs and pancreas.
  • Pancreatic juice exemplifies high-bicarbonate fluids secreted by CFTR-expressing epithelia.

Purpose of the Study:

  • To elucidate the fundamental principles of transepithelial bicarbonate transport.
  • To detail the mechanisms underlying pancreatic bicarbonate secretion.
  • To highlight the variable roles of CFTR in bicarbonate secretion across different epithelial tissues.

Main Methods:

  • Review and synthesis of current knowledge on epithelial bicarbonate transport mechanisms.
  • Focus on the role of CFTR in direct and indirect bicarbonate secretion.
  • Comparative analysis of CFTR function in epithelia secreting low vs. high bicarbonate concentrations.

Main Results:

  • CFTR is a central regulator of apical membrane bicarbonate transport.
  • The specific function of CFTR (Cl(-)/HCO(3)(-) exchange vs. selective bicarbonate channel) depends on the bicarbonate concentration required.
  • High-bicarbonate fluid secretion necessitates highly selective CFTR bicarbonate channel activity.

Conclusions:

  • Understanding the molecular mechanisms of transepithelial bicarbonate transport is key.
  • Targeting CFTR's role in specific epithelia offers therapeutic potential for cystic fibrosis.
  • Restoring epithelial bicarbonate hyposecretion could alleviate cystic fibrosis symptoms.