Gastrointestinal Mucosal Defense System (Colloquium Integrated Systems Physiology: From Molecule to Function to Disease)
Kvietys, Peter R.; Yaqinuddin, Ahmed; Al Kattan, Wael
ISBN 10: 1615041478 ISBN 13: 9781615041473
Published by Morgan & Claypool Life Sciences, 2014
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The gastrointestinal mucosal defense system serves to minimize mucosal injury by either ingested or endogenously produced noxious substances. The mucosal defense system is stratified into pre-epithelial (alkaline mucus), epithelial (dynamic epithelial lining), and post-epithelial (microcirculation) components. The mucus lining the epithelial surface presents a diffusional barrier to ingested material (e.g., lipids) and also serves as an unstirred layer in which a pH gradient can be established to prevent acid-induced injury. The epithelial lining prevents entrance of any toxic material to the interstitium and, should it be damaged, it is rapidly resealed by migration of adjacent viable epithelial cells to cover the defect. Any acid or other material that has entered the interstitium is washed out by an intense neurogenic hyperemia. In general, the mucosal defense system is quite effective and any adverse gastrointestinal effects associated with the normal course of nutrient assimilation are minimal. However, there are two situations in which the mucosal defense system is known to be ineffective and result in gastric mucosal injury: inadvertent ingestion of H. pylori. or intentional ingestion of NSAIDs. H. pylori can penetrate the mucus layers and cause epithelial injury and inflammation, while at the same time preventing its clearance by the host immune system. NSAIDs weaken the mucus layer and cause epithelial cell injury.
Table of Contents: Acknowledgments / Introduction / The Mucus Layer / Epithelial Lining / Gastrointestinal Circulation / Integration of Mucosal Defense / Mucosal Defense System: Physiologic / Mucosal Defense System: H. pylori / Mucosal Defense System: Nonsteroidal Anti-Inflammatory Drugs (NSAIDS) / Overall Summary and Conclusions / References / Author Biographies
About the Author: College of Medicine, Alfaisal University, Riyadh, KSA
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Title: Gastrointestinal Mucosal Defense System (...
Publisher: Morgan & Claypool Life Sciences
Publication Date: 2014
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Condition: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. The gastrointestinal mucosal defense system serves to minimize mucosal injury by either ingested or endogenously produced noxious substances. However, there are two situations in which the mucosal defense system is known to be ineffective and result in gast. Seller Inventory # 448166640
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Taschenbuch. Condition: Neu. Gastrointestinal Mucosal Defense System | Peter R. Kvietys (u. a.) | Taschenbuch | Kartoniert / Broschiert | Englisch | 2014 | Biota Publishing | EAN 9781615041473 | Verantwortliche Person für die EU: Libri GmbH, Europaallee 1, 36244 Bad Hersfeld, gpsr[at]libri[dot]de | Anbieter: preigu Print on Demand. Seller Inventory # 104987077
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Taschenbuch. Condition: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - The gastrointestinal mucosal defense system serves to minimize mucosal injury by either ingested or endogenously produced noxious substances. The mucosal defense system is stratified into pre-epithelial (alkaline mucus), epithelial (dynamic epithelial lining), and post-epithelial (microcirculation) components. The mucus lining the epithelial surface presents a diffusional barrier to ingested material (e.g., lipids) and also serves as an unstirred layer in which a pH gradient can be established to prevent acid-induced injury. The epithelial lining prevents entrance of any toxic material to the interstitium and, should it be damaged, it is rapidly resealed by migration of adjacent viable epithelial cells to cover the defect. Any acid or other material that has entered the interstitium is washed out by an intense neurogenic hyperemia. In general, the mucosal defense system is quite effective and any adverse gastrointestinal effects associated with the normal course of nutrient assimilation are minimal. However, there are two situations in which the mucosal defense system is known to be ineffective and result in gastric mucosal injury: inadvertent ingestion of H. pylori. or intentional ingestion of NSAIDs. H. pylori can penetrate the mucus layers and cause epithelial injury and inflammation, while at the same time preventing its clearance by the host immune system. NSAIDs weaken the mucus layer and cause epithelial cell injury. Table of Contents: Acknowledgments / Introduction / The Mucus Layer / Epithelial Lining / Gastrointestinal Circulation / Integration of Mucosal Defense / Mucosal Defense System: Physiologic / Mucosal Defense System: H. pylori / Mucosal Defense System: Nonsteroidal Anti-Inflammatory Drugs (NSAIDS) / Overall Summary and Conclusions / References / Author Biographies. Seller Inventory # 9781615041473
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