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Related Concept Videos

Chronic Pancreatitis I: Introduction01:24

Chronic Pancreatitis I: Introduction

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The pancreas, an elongated and flat gland situated behind the stomach, serves a vital function in digesting food and managing blood sugar levels.
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Chronic Bowel Disorders: Introduction01:17

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Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
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Gastritis-II: Pathophysiology01:17

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Gastritis is marked by disruption of the mucosal barrier that usually protects the stomach tissue from digestive juices and manifests in acute and chronic forms.
In acute gastritis, the gastric mucosa becomes swollen and red and undergoes superficial erosion. Superficial ulceration may lead to bleeding.
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Acute Pancreatitis I: Introduction01:27

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Pancreatitis is inflammation of the pancreas, an organ located behind the stomach. It can be either acute or chronic.
Acute pancreatitis is characterized by rapid inflammation of the pancreas, often caused by factors like gallstone blockage or excessive alcohol consumption. Chronic pancreatitis, on the other hand, is a slow, progressive inflammation that may result from long-term alcohol abuse, obstructions in the pancreatic duct, or genetic factors.
The causes of acute pancreatitis include:
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Pathophysiology of Peptic Ulcer Disease: Injurious Factors01:22

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Peptic ulcers are sores on the stomach's inner lining and the upper small intestine, which are the result of disruptions in the mucosal layer that houses parietal cells which produce gastric acid, and chief cells which secrete pepsinogen.
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Acute Pancreatitis II: Clinical Manifestations and Management01:30

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Acute pancreatitis presents a complex medical emergency characterized by rapid onset inflammation of the pancreas, demanding timely diagnosis and management to prevent complications. The condition primarily manifests through severe upper abdominal pain that often radiates to the back. This pain intensifies following the consumption of fatty foods. Accompanying symptoms such as nausea, vomiting, abdominal distention, fever, dyspnea, cyanosis, and jaundice can vary in intensity but significantly...
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Primary biliary cholangitis: pathogenic mechanisms.

Jesús Prieto1, Jesus M Banales2,3,4, Juan F Medina5

  • 1Center for Applied Medical Research (Centro de Investigación Médica Aplicada, CIMA), University of Navarra, Pamplona.

Current Opinion in Gastroenterology
|December 17, 2020
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Summary
This summary is machine-generated.

Primary biliary cholangitis involves autoimmune damage to bile ducts, potentially linked to the Cl-/HCO3- exchanger AE2. This dysfunction may explain disease characteristics and the female predominance in primary biliary cholangitis.

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Area of Science:

  • Hepatology
  • Immunology
  • Cell Biology

Background:

  • Primary biliary cholangitis (PBC) is an autoimmune liver disease targeting intrahepatic bile ducts.
  • Its pathogenesis is unclear, with unexplained features like restricted damage to biliary epithelial cells (BECs), lack of response to immunosuppressants, and female predominance.

Purpose of the Study:

  • To present an etiological view of PBC that explains its perplexing features.
  • To elucidate the role of the Cl-/HCO3- exchanger AE2 in PBC pathogenesis.

Main Methods:

  • Review of existing literature on PBC pathogenesis.
  • Analysis of the role of AE2 dysfunction in BECs and lymphocytes.
  • Exploration of mitophagy regulation in relation to intracellular pH.

Main Results:

  • Epigenetic silencing of AE2 in cholangiocytes and lymphocytes in genetically predisposed individuals.
  • AE2 dysfunction leads to decreased biliary HCO3- secretion, BEC damage, and increased susceptibility to bile salt-induced apoptosis.
  • Altered mitophagy due to AE2 deficiency may promote mitochondrial damage and antigen presentation, potentially explaining female predominance.

Conclusions:

  • PBC can be viewed as a disorder of Cl-/HCO3- exchange in individuals with a genetic predisposition to autoimmunity.
  • AE2 dysfunction is a central mechanism in PBC, affecting BECs and immune cells.
  • Further research into AE2's role could reveal new therapeutic targets for PBC.