Gastrointestinal Mucosal Defense System
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Gastrointestinal Mucosal Defense System
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Author : Peter R. Kvietys
language : en
Publisher: Biota Publishing
Release Date : 2014-11-01
Gastrointestinal Mucosal Defense System written by Peter R. Kvietys and has been published by Biota Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-01 with Medical categories.
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
The Gastrointestinal Circulation
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Author : Peter R. Kvietys
language : en
Publisher: Morgan & Claypool Publishers
Release Date : 2010
The Gastrointestinal Circulation written by Peter R. Kvietys and has been published by Morgan & Claypool Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Medical categories.
The microcirculation of the gastrointestinal tract is under the control of both myogenic and metabolic regulatory systems. The myogenic mechanism contributes to basal vascular tone and the regulation of transmural pressure, while the metabolic mechanism is responsible for maintaining an appropriate balance between O2 demand and O2 delivery. In the postprandial state, hydrolytic products of food digestion elicit a hyperemia, which serves to meet the increased O2 demand of nutrient assimilation. Metabolically linked factors (e.g., tissue pO2, adenosine) are primarily responsible for this functional hyperemia. The fenestrated capillaries of the gastrointestinal mucosa are relatively permeable to small hydrolytic products of food digestion (e.g., glucose), yet restrict the transcapillary movement of larger molecules (e.g., albumin). This allows for the absorption of hydrolytic products of food digestion without compromising the oncotic pressure gradient governing transcapillary fluid movement and edema formation. The gastrointestinal microcirculation is also an important component of the mucosal defense system whose function is to prevent (and rapidly repair) inadvertent epithelial injury by potentially noxious constituents of chyme. Two pathological conditions in which the gastrointestinal circulation plays an important role are ischemia/reperfusion and chronic portal hypertension. Ischemia/reperfusion results in mucosal edema and disruption of the epithelium due, in part, to an inflammatory response (e.g., increase in capillary permeability to macromolecules and neutrophil infiltration). Chronic portal hypertension results in an increase in gastrointestinal blood flow due to an imbalance in vasodilator and vasoconstrictor influences on the microcirculation. Table of Contents: Introduction / Anatomy / Regulation of Vascular Tone and Oxygenation / Extrinsic Vasoregulation: Neural and Humoral / Postprandial Hyperemia / Transcapillary Solute Exchange / Transcapillary Fluid Exchange / Interaction of Capillary and Interstitial Forces / Gastrointestinal Circulation and Mucosal Defense / Gastrointestinal Circulation and Mucosal Pathology I: Ischemia/Reperfusion / Gastrointestinal Circulation and Mucosal Pathology II: Chronic Portal Hypertension / Summary and Conclusions / References / Author Biography
Gastrointestinal Defence Mechanisms
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Author : Gy. Mózsik
language : en
Publisher: Elsevier
Release Date : 2013-10-22
Gastrointestinal Defence Mechanisms written by Gy. Mózsik and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Health & Fitness categories.
Advances in Physiological Sciences, Volume 29: Gastrointestinal Defence Mechanisms is a collection of papers that details the findings of research studies on the theoretical and practical aspects of the gastrointestinal defense mechanisms. The title first covers circulation and mucosal defense, and then proceeds to tackling the association of gastrointestinal mechanisms with the secretory functions. Next, the selection deals with the resistance in gastric mucosa and mucosal energy provision. The text also discusses cell renewal and toxicity, along with biotransformation and nutrition. In Part VII, the title details the immunomechanisms of defense at mucosa. The last part covers the second line defense at liver and enterohepatic circulation. The book will of great interest to both researchers and practitioners of medical fields concerned with the digestive system.
Janeway S Immunobiology
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Author : Kenneth Murphy
language : en
Publisher: Garland Science
Release Date : 2010-06-22
Janeway S Immunobiology written by Kenneth Murphy and has been published by Garland Science this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-06-22 with Medical categories.
The Janeway's Immunobiology CD-ROM, Immunobiology Interactive, is included with each book, and can be purchased separately. It contains animations and videos with voiceover narration, as well as the figures from the text for presentation purposes.
Heat Shock Response And Gastrointestinal Mucosal Defense
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Author : Niku K. J. Oksala
language : en
Publisher:
Release Date : 2003
Heat Shock Response And Gastrointestinal Mucosal Defense written by Niku K. J. Oksala and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Regulation Of Gastrointestinal Mucosal Growth
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Author : Rao N. Jaladanki
language : en
Publisher: Biota Publishing
Release Date : 2016-11-30
Regulation Of Gastrointestinal Mucosal Growth written by Rao N. Jaladanki and has been published by Biota Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-30 with Medical categories.
The mammalian gastrointestinal mucosa is a rapidly self-renewing tissue in the body, and its homeostasis is preserved through the strict regulation of epithelial cell proliferation, growth arrest, and apoptosis. The control of the growth of gastrointestinal mucosa is unique and, compared with most other tissue in the body, complex. Mucosal growth is regulated by the same hormones that alter metabolism in other tissues, but the gastrointestinal mucosa also responds to host events triggered by the ingestion and presence of food within the digestive tract. These gut hormones and peptides regulate the growth of the exocrine pancreas, gallbladder epithelium, and the mucosa of the oxyntic gland region of the stomach and the small and large intestines. Luminal factors, including nutrients or other dietary factors, secretions, and microbes that occur within the lumen and distribute over a proximal-to-distal gradient, are also crucial for maintenance of normal gut mucosal regeneration and could explain the villous-height-crypt-depth gradient and variety of adaptation, since these factors are diluted, absorbed, and destroyed as they pass down the digestive tract. Recently, intestinal stem cells, cellular polyamines, and noncoding RNAs are shown to play an important role in the regulation of gastrointestinal mucosal growth under physiological and various pathological conditions. In this book, we highlight key issues and factors that control gastrointestinal mucosal growth and homeostasis, with special emphasis on the mechanisms through which epithelial renewal and apoptosis are regulated at the cellular and molecular levels.
Handbook Of Mucosal Immunology
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Author :
language : en
Publisher: Academic Press
Release Date : 2012-12-02
Handbook Of Mucosal Immunology written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Medical categories.
Researchers have recently made tremendous progress in the area of mucosal immunology, greatly increasing our understanding of the common mucosal immune system, mucosal infections, and oral immunization. However, thisresearch has not previously been made available in a single work. In its large 81/2"x 11"format, Handbook of Mucosal Immunology covers the entire spectrum of mucosal immunity and is organized in two main sections to present the basic biology of the common mucosal immune system and the immune responses of the mucosae.The first section provides an introduction and historical perspective of the mucosal immune system and includes comprehensive discussion of the development and physiology of mucosal defense. It discusses such topics as the structure and function of themucosal epithelium, characteristics of mucosal-associated lymphoid tissue (MALT), Peyers patches, and concepts of mucosal vaccines. The second section focuses on the secretory immune system with special reference to mucosal diseases in the digestive (GALT), respiratory (BALT), and genitourinary tracts. This information is especially important in light of the current interest in the mechanisms, transmission, and prevention of infectious diseases such as AIDS, hepatitis, and tuberculosis.Virtually all chapters have been authored by the original investigators responsible for key observations on which current concepts are based. This handbook will be an invaluable resource for a diverse group of both researchers and practicing clinicians.Molecular biologists, immunologists, veterinarians, public health workers, physicians in specialties from pediatrics to pulmonology, and graduate students of mucosal immunology will all find this handbook the most complete work on the subject.
Immunophysiology Of The Gut
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Author : W. Allan Walker
language : en
Publisher: Academic Press
Release Date : 2013-10-22
Immunophysiology Of The Gut written by W. Allan Walker and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Health & Fitness categories.
Bristol-Myers Squibb/Mead Johnson Nutrition Symposia, Volume 11: Immunophysiology of the Gut represents a comprehensive and systematic coverage of the immunophysiology of the gut, compiling research that integrates the mucosal immune system and intestinal physiology. This book discusses the immunological regulation of epithelial function, fibroblastic sheath, pathways of arachidonic acid metabolism, and gastric response to mucosal anaphylaxis. The implications for inflammatory diarrhea, role of breast milk in neonatal host defense, and milk-borne peptide growth factors in human and bovine milk are also elaborated. This publication likewise covers the immunopathologic features of celiac disease, immune responses in protein-energy malnutrition, and bacterial translocation. This volume is suitable for experts and clinicians from the disciplines of mucosal immunology, intestinal physiology, and enteric neurophysiology.
Principles Of Mucosal Immunology
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Author : Phillip Smith
language : en
Publisher: Garland Science
Release Date : 2020-04-21
Principles Of Mucosal Immunology written by Phillip Smith and has been published by Garland Science this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-04-21 with Medical categories.
This respected graduate-level textbook provides comprehensive and accessible coverage of the basic and clinical aspects of the mucosal immune system, addressing the major components of the mucosal barrier ̶ gastrointestinal, upper and lower respiratory, ocular, and genitourinary mucosal immune systems ̶ in a highly user-friendly style. The editors of and contributors to the book, all internationally-recognized leaders, present the current principles, concepts, and basic processes involved in mucosal immunology, mucosal diseases, and host defense at mucosal surfaces. Topics discussed include the development and structure of the mucosal immune system and its cellular constituents, host-microbe relationships, infection, mucosal diseases, and vaccines. The second edition has been carefully updated throughout to reflect the latest developments from clinical research and key literature has been fully updated.
Gastrointestinal Mucosal Protective Mechanisms
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Author : Christer Atuma
language : en
Publisher:
Release Date : 2000
Gastrointestinal Mucosal Protective Mechanisms written by Christer Atuma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.