Effects of Helicobacter Pylori Infection on the Histology, Cellular Phenotype, K-ras Mutations, and Cell Kinetics in Gastric Intestinal Metaplasia in Patients with Chronic Gastritis and Gastric Cancer PDF Download
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Author: Jiro Watari
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages :
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Book Description
Effects of Helicobacter pylori Infection on the Histology, Cellular Phenotype, K-ras Mutations, and Cell Kinetics in Gastric Intestinal Metaplasia in Patients with Chronic Gastritis and Gastric Cancer.
Author: Jiro Watari
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages :
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Book Description
Effects of Helicobacter pylori Infection on the Histology, Cellular Phenotype, K-ras Mutations, and Cell Kinetics in Gastric Intestinal Metaplasia in Patients with Chronic Gastritis and Gastric Cancer.
Author: Jiro Watari
Publisher:
ISBN: 9789533073750
Category :
Languages : en
Pages :
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Book Description
Author: Paola Tonino
Publisher: BoD – Books on Demand
ISBN: 9533073756
Category : Medical
Languages : en
Pages : 312
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Book Description
This book is a comprehensive overview of invited contributions on Helicobacter pylori infection in gastritis and gastric carcinogenesis. The first part of the book covers topics related to the pathophysiology of gastric mucosal defense system and gastritis including the gastroprotective function of the mucus, the capsaicin-sensitive afferent nerves and the oxidative stress pathway involved in inflammation, apoptosis and autophagy in H. pylori related gastritis. The next chapters deal with molecular pathogenesis and treatment, which consider the role of neuroendocrine cells in gastric disease, DNA methylation in H. pylori infection, the role of antioxidants and phytotherapy in gastric disease. The final part presents the effects of cancer risk factors associated with H. pylori infection. These chapters discuss the serum pepsinogen test, K-ras mutations, cell kinetics, and H. pylori lipopolysaccharide, as well as the roles of several bacterial genes (cagA, cagT, vacA and dupA) as virulence factors in gastric cancer, and the gastrokine-1 protein in cancer progression.
Author: Philip Sutton
Publisher: CABI
ISBN: 1845935942
Category : Medical
Languages : en
Pages : 316
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Book Description
This book provides a broad overview of the current understanding of Helicobacter pylori emphasizing its world health impacts. It includes 13 chapters organized into 3 parts: "Pathologies and Treatment", "Host Response" and "Bacterial Defence". Part I (5 chapters) reviews the epidemiology of H. pylori infection, H. pylori infection in Asia, gastric adenocarcinoma, antimicrobial resistance and approaches to treatment, and extragastric manifestations of H. pylori infection. Part II (4 chapters) describes H. pylori-induced acquired immunity and immunoregulation, host genetic factors and susceptibility to H. pylori pathogenesis, innate immune initiators and effectors in H. pylori infection, and H. pylori vaccines. Part III (4 chapters) discusses the importance of H. pylori lipopolysaccharides in gastric adaptation and pathogenesis, H. pylori virulence factors, H. pylori adhesion to the gastric surface, and helicobacteromics. This book is an essential resource for researchers, students and medics in infectious and Helicobacter-associated diseases.
Author: Alexander Sheh
Publisher:
ISBN:
Category :
Languages : en
Pages : 183
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Book Description
Gastric cancer is the 2nd leading cause of cancer death worldwide and the 4th most commonly diagnosed cancer worldwide. Helicobacter pylori infection is the major risk factor of gastric cancer, and as such, this bacterium has been classified as a type 1, or definite, carcinogen by the International Agency for Research on Cancer. H. pylori infects the gastric mucosa of more than half of the world's population and promotes gastric carcinogenesis by inducing chronic inflammation. Over decades of persistent H. pylori infection and chronic inflammation, the stomach goes through a well characterized pathological progression involving chronic gastritis, atrophy, intestinal metaplasia, dysplasia, and ultimately cancer. Interestingly, there are strong gender differences in the development of gastric cancer, as men are twice as likely to develop the disease than women. Given the importance of H. pylori and chronic inflammation in gastric carcinogenesis, this thesis investigated the role of gender in modulating host immune responses to H. pylori. The aims of this thesis explored 1) the effect of gender on H. pylori's ability to induce mutations and 2) the effect of estrogen and the anti-estrogen, Tamoxifen, on H. pyloriinduced gastric cancer. For the first aim, the gpt delta mouse model, a murine mutational analysis model, was used to study chronic infection with H. pylori. Increased frequency of point mutations was observed in infected female mice at 12 months post infection. These mutations were not observed in infected male mice. Further analysis revealed that H. pylori induced a greater immune response in female mice in this model, as measured by increased severity of gastric lesions, decreased bacterial counts and the higher levels of Th1 antibodies for H. pylori. The spectra of mutations pointed towards oxidative damage as the underlying cause of induction. This study revealed that gender differences in mutagenesis were mediated by the severity and duration of the immune response. In the second aim, 17[beta]-estradiol prevented the formation of gastric cancer in the INSGAS mouse model, which develops gastric cancer in a male-predominant manner. Unexpectedly, this study led to the discovery that Tamoxifen may act as an agonist in this model of gastric cancer, as it was able to prevent gastric cancer using mechanisms similar to 17ß- estradiol. Both compounds downregulated pathways associated with cellular movement and cancer. CXCL1, a murine homolog of IL-8, was downregulated by treatment at both local and systemic levels, which led to a decreased neutrophilic infiltrate. 17[beta]-estradiol and Tamoxifen mediated the disruption of a positive feedback loop coupling CXCL1 secretion with neutrophil recruitment, which dampened the activation of proinflammatory and oncogenic pathways, leading to protection against gastric cancer. In conclusion, these studies provide further insight into the role of gender modulation of host immune response in H. pylori-induced mutagenesis and carcinogenesis.
Author: T.C. Northfield
Publisher: Springer Science & Business Media
ISBN: 9401122164
Category : Medical
Languages : en
Pages : 187
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Book Description
Now that Helicobacter pylori is generally accepted as a key aetiological agent in gastric cancer as well as the main agent in peptic ulcer, it can claim to be the most important new discovery in clinical gastroenterology of the last decade, and yet there is no up-to-date book available on the subject that is designed primarily for the clinical gastroenterologist. This book aims to fill that niche. It should also be of interest to the basic scientist, to those providing a clinical laboratory service (microbiologists and histopathologists), and to epidemiologists and others involved in clinical research.
Author: Peter Malfertheiner
Publisher: Springer Science & Business Media
ISBN: 3642753159
Category : Medical
Languages : en
Pages : 479
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Book Description
Helieobaeter pylori has recently been recognized as a new genus according to specific taxonomic criteria; the "popular" name Campylobaeter pylori has been corrected by scientific progress. Following the discovery of the spiral microorgan ism in gastric mucosa by Marshall and Warren in 1982, it took only a few years for H. pylori to become established as a factor in the pathogenesis of gastritis and peptic ulcer disease. Interest in different aspects of H. pylori has grown continuously and has attracted scientists from various medical and biological disciplines such as gastroenterology, microbiology, pathology, immunology, and pharmacology. Indeed H. pylori provides an excellent model for interdisciplinary interaction and cooperation. To promote this concept of interdisciplinary research and exchange of knowledge, a European Campylobacter (Helicobacter) Pylori Study Group was founded in 1987 in Copenhagen. The second meeting of this expanding group was held from October 12-14,1989 in Ulm, FRG. The fact that more than 500 participants attended the conference and that 187 original contributions from all five continents were presented clearly confirmed that H. pylori has "scientifically infected" the whole world. Our understanding of the microbiological and pathogenetic aspects of H. pylori is continuously being challenged as new results follow swifthy from different research areas. This book includes an update and progress report on the various aspects of H. pylori presented and discussed in special workshops held during the meeting in Ulm.
Author: Jyh-Chin Yang
Publisher:
ISBN: 9789533073750
Category :
Languages : en
Pages :
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Book Description
Author: Bruna Maria Roesler
Publisher:
ISBN: 9789533073750
Category :
Languages : en
Pages :
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Book Description
Author: M. Priyanthi Kumarasinghe
Publisher: Springer
ISBN: 3319791176
Category : Medical
Languages : en
Pages : 340
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Book Description
The volume of endoscopic biopsies being performed continues to grow rapidly and they now represent one of the most common specimens encountered in routine surgical pathology practice. It is essential to maintain the balance between the speed and accuracy while integrating emerging sophisticated pathology techniques into endoscopic biopsies in routine practice. Microscopic appearance is virtually diagnostic of certain diseases. In others a diagnosis may be rendered only after correlating the microscopic pattern with clinical clues aided by ancillary tests. This text provides a guide to systematic approach of endoscopic biopsies to render a safe, quick and accurate pathological diagnosis in an integrated manner as well as important information that pathologists and clinicians should know to get the best value of endoscopic biopsies. The first chapter introduces the key microscopic features that are normal and abnormal in the gut mucosa as appreciated in an endoscopic biopsy. The second chapter presents a general overview highlighting the neoplastic and non-neoplastic patterns that are common to the entire tubular gut. Because some patterns are common to many sites, an overarching chapter gives the reader a generalized approach, which will be further refined in subsequent site specific chapters. The disease etiologies of each pattern are discussed, with emphasis placed on the most common causes that will be encountered in clinical practice. The subsequent chapters that follow then concentrate on patterns encountered at specific anatomical locations. Under each anatomical location (esophagus, stomach, small intestine and large intestine) site specific patterns of both neoplastic and non-neoplastic conditions are described. Conditions that affect many sites in the gastrointestinal tract are discussed in detail in the most relevant site chapter, but are referred to in other chapters as the reaction pattern/s they produce at that site is discussed. Ancillary tests that are required for a diagnosis of some diseases in particular neoplastic conditions are listed with tips for interpretation. This is presented mostly in a table format to assist day-to-day quick reference. In keeping with recent advances of using small biopsies for testing clinically relevant bio markers, important information that the pathologists and clinicians need to know is highlighted in appropriate sites. Authored by experts in the field, each chapter is presented under headings that include diagnostic features, patterns with relevant endoscopic and clinical clues, traps and overlapping features, and appropriate ancillary tests including clinically relevant molecular signatures in endoscopic biopsies.
