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World Journal of Gastroenterology Oct 2019() is a gram-negative bacterium that infects approximately 4.4 billion individuals worldwide. However, its prevalence varies among different geographic areas, and is... (Review)
Review
() is a gram-negative bacterium that infects approximately 4.4 billion individuals worldwide. However, its prevalence varies among different geographic areas, and is influenced by several factors. The infection can be acquired by means of oral-oral or fecal-oral transmission, and the pathogen possesses various mechanisms that improve its capacity of mobility, adherence and manipulation of the gastric microenvironment, making possible the colonization of an organ with a highly acidic lumen. In addition, presents a large variety of virulence factors that improve its pathogenicity, of which we highlight cytotoxin associated antigen A, vacuolating cytotoxin, duodenal ulcer promoting gene A protein, outer inflammatory protein and gamma-glutamyl transpeptidase. The host immune system, mainly by means of a Th1-polarized response, also plays a crucial role in the infection course. Although most -positive individuals remain asymptomatic, the infection predisposes the development of various clinical conditions as peptic ulcers, gastric adenocarcinomas and mucosa-associated lymphoid tissue lymphomas. Invasive and non-invasive diagnostic methods, each of them with their related advantages and limitations, have been applied in detection. Moreover, bacterial resistance to antimicrobial therapy is a major challenge in the treatment of this infection, and new therapy alternatives are being tested to improve eradication. Last but not least, the development of effective vaccines against infection have been the aim of several research studies.
Topics: Antacids; Anti-Bacterial Agents; Bacterial Vaccines; Drug Resistance, Bacterial; Drug Therapy, Combination; Gastric Mucosa; Helicobacter Infections; Helicobacter pylori; Humans; Hydrogen-Ion Concentration; Probiotics; Proton Pump Inhibitors; Stomach Diseases; Treatment Outcome; Virulence Factors
PubMed: 31602159
DOI: 10.3748/wjg.v25.i37.5578 -
Gut Oct 2015The stomach is traditionally regarded as a hollow muscular sac that initiates the second phase of digestion. Yet this simple view ignores the fact that it is the most... (Review)
Review
The stomach is traditionally regarded as a hollow muscular sac that initiates the second phase of digestion. Yet this simple view ignores the fact that it is the most sophisticated endocrine organ with unique physiology, biochemistry, immunology and microbiology. All ingested materials, including our nutrition, have to negotiate this organ first, and as such, the stomach is arguably the most important segment within the GI tract. The unique biological function of gastric acid secretion not only initiates the digestive process but also acts as a first line of defence against food-borne microbes. Normal gastric physiology and morphology may be disrupted by Helicobacter pylori infection, the most common chronic bacterial infection in the world and the aetiological agent for most peptic ulcers and gastric cancer. In this state-of-the-art review, the most relevant new aspects of the stomach in health and disease are addressed. Topics include gastric physiology and the role of gastric dysmotility in dyspepsia and gastroparesis; the stomach in appetite control and obesity; there is an update on the immunology of the stomach and the emerging field of the gastric microbiome. H. pylori-induced gastritis and its associated diseases including peptic ulcers and gastric cancer are addressed together with advances in diagnosis. The conclusions provide a future approach to gastric diseases underpinned by the concept that a healthy stomach is the gateway to a healthy and balanced host. This philosophy should reinforce any public health efforts designed to eradicate major gastric diseases, including stomach cancer.
Topics: Gastric Mucosa; Humans; Stomach; Stomach Diseases
PubMed: 26342014
DOI: 10.1136/gutjnl-2014-307595 -
Revista Espanola de Enfermedades... Nov 2023A 47-year-old man presented with a 6-day pain in the right chest. Abdominal CT showed an elliptical homogeneous mass, which was closely related to the posterior wall of...
A 47-year-old man presented with a 6-day pain in the right chest. Abdominal CT showed an elliptical homogeneous mass, which was closely related to the posterior wall of the stomach and the lesion grew from the posterior wall of the stomach to the abdominal cavity in the wedge shape. The enhanced scan showed no enhancement in the lesion. The left adrenal gland and the upper pole, pancreas and spleen were changed due to compression. Carbohydrate antigen 72-4 (CA72-4) was 45.1U/ml (0.00~5.30 U/ml). The gastroscopy results showed that there was protruded lesion in the posterior gastric wall and atrophic gastritis in the superficial stomach. Laparoscopic exploration and partial gastrectomy were performed. An 8cm × 7cm tumor was found at the posterior wall of the fundus near the cardia, with smooth serosal surface. The cystic mass was smooth surface, filled with yellow thick liquid. Microscopically, the cystic wall tissue was lined with pseudo-stratified ciliated columnar epithelium, and mucous glands were seen under the epithelium. Pathological diagnosis showed bronchogenic cysts of the gastric submucosal. At 2-month follow-up, the postoperative recovery was good.
Topics: Male; Humans; Middle Aged; Bronchogenic Cyst; Stomach Diseases; Pancreas; Spleen
PubMed: 37882202
DOI: 10.17235/reed.2023.9964/2023 -
Development (Cambridge, England) Feb 2016The stomach, an organ derived from foregut endoderm, secretes acid and enzymes and plays a key role in digestion. During development, mesenchymal-epithelial interactions... (Review)
Review
The stomach, an organ derived from foregut endoderm, secretes acid and enzymes and plays a key role in digestion. During development, mesenchymal-epithelial interactions drive stomach specification, patterning, differentiation and growth through selected signaling pathways and transcription factors. After birth, the gastric epithelium is maintained by the activity of stem cells. Developmental signals are aberrantly activated and stem cell functions are disrupted in gastric cancer and other disorders. Therefore, a better understanding of stomach development and stem cells can inform approaches to treating these conditions. This Review highlights the molecular mechanisms of stomach development and discusses recent findings regarding stomach stem cells and organoid cultures, and their roles in investigating disease mechanisms.
Topics: Animals; Body Patterning; Endoderm; Humans; Signal Transduction; Stem Cells; Stomach; Stomach Diseases
PubMed: 26884394
DOI: 10.1242/dev.124891 -
The Oncologist Dec 2015Although the majority of gastric carcinomas are sporadic, approximately 10% show familial aggregation, and a hereditary cause is determined in 1%-3% cases. Of these,... (Review)
Review
Although the majority of gastric carcinomas are sporadic, approximately 10% show familial aggregation, and a hereditary cause is determined in 1%-3% cases. Of these, hereditary diffuse gastric cancer is the most recognized predisposition syndrome. Although rare, the less commonly known syndromes also confer a markedly increased risk for development of gastric cancer. Identification and characterization of these syndromes require a multidisciplinary effort involving oncologists, surgeons, genetic counselors, biologists, and pathologists. This article reviews the molecular genetics, clinical and pathologic features, surveillance guidelines, and preventive measures of common and less common hereditary gastric cancer predisposition syndromes.
Topics: Adenocarcinoma; Genetic Predisposition to Disease; Humans; Neoplastic Syndromes, Hereditary; Polyps; Stomach Diseases; Stomach Neoplasms
PubMed: 26424758
DOI: 10.1634/theoncologist.2015-0205 -
Chirurgia (Bucharest, Romania : 1990) 2020Post-gastrectomy complications have been the associated sequelae after curative gastrectomy for long time. They include a conundrum of symptoms ranging from serious... (Review)
Review
Post-gastrectomy complications have been the associated sequelae after curative gastrectomy for long time. They include a conundrum of symptoms ranging from serious metabolic alterations to disorders attributed to mechanical and neural factors after reconstruction of the digestive continuity. Though, with the advancement in the surgical expertise and techniques and shift towards medical and endoscopic management for benign gastro-duodenal ulcer disease, there has been a decline in the incidence of these complications; they continue to raise "red flags" after major oncologic gastric resections. Identification of these symptoms and protocol based management of the same is of utmost importance in the surgical armamentarium of trainees and practicing physicians and surgeons.
Topics: Gastrectomy; Humans; Postgastrectomy Syndromes; Stomach Diseases; Stomach Neoplasms; Treatment Outcome
PubMed: 32876015
DOI: 10.21614/chirurgia.115.4.423 -
International Journal of Molecular... Oct 2019The use of proton pump inhibitors (PPIs) over the last 30 years has rapidly increased both in the United States and worldwide. PPIs are not only very widely used both... (Review)
Review
The use of proton pump inhibitors (PPIs) over the last 30 years has rapidly increased both in the United States and worldwide. PPIs are not only very widely used both for approved indications (peptic ulcer disease, gastroesophageal reflux disease (GERD), Helicobacter pylori eradication regimens, stress ulcer prevention), but are also one of the most frequently off-label used drugs (25-70% of total). An increasing number of patients with moderate to advanced gastroesophageal reflux disease are remaining on PPI indefinitely. Whereas numerous studies show PPIs remain effective and safe, most of these studies are <5 years of duration and little data exist for >10 years of treatment. Recently, based primarily on observational/epidemiological studies, there have been an increasing number of reports raising issues about safety and side-effects with very long-term chronic treatment. Some of these safety issues are related to the possible long-term effects of chronic hypergastrinemia, which occurs in all patients taking chronic PPIs, others are related to the hypo-/achlorhydria that frequently occurs with chronic PPI treatment, and in others the mechanisms are unclear. These issues have raised considerable controversy in large part because of lack of long-term PPI treatment data (>10-20 years). Zollinger-Ellison syndrome (ZES) is caused by ectopic secretion of gastrin from a neuroendocrine tumor resulting in severe acid hypersecretion requiring life-long antisecretory treatment with PPIs, which are the drugs of choice. Because in <30% of patients with ZES, a long-term cure is not possible, these patients have life-long hypergastrinemia and require life-long treatment with PPIs. Therefore, ZES patients have been proposed as a good model of the long-term effects of hypergastrinemia in man as well as the effects/side-effects of very long-term PPI treatment. In this article, the insights from studies on ZES into these controversial issues with pertinence to chronic PPI use in non-ZES patients is reviewed, primarily concentrating on data from the prospective long-term studies of ZES patients at NIH.
Topics: Animals; Carcinoma, Neuroendocrine; Chronic Disease; Gastrinoma; Gastrins; Humans; Proton Pump Inhibitors; Risk Factors; Stomach Diseases; Time Factors; Treatment Outcome; Zollinger-Ellison Syndrome
PubMed: 31623145
DOI: 10.3390/ijms20205128 -
Gastroenterology May 2017Obesity usually is associated with morbidity related to diabetes mellitus and cardiovascular diseases. However, there are many gastrointestinal and hepatic diseases for... (Review)
Review
Obesity usually is associated with morbidity related to diabetes mellitus and cardiovascular diseases. However, there are many gastrointestinal and hepatic diseases for which obesity is the direct cause (eg, nonalcoholic fatty liver disease) or is a significant risk factor, such as reflux esophagitis and gallstones. When obesity is a risk factor, it may interact with other mechanisms and result in earlier presentation or complicated diseases. There are increased odds ratios or relative risks of several gastrointestinal complications of obesity: gastroesophageal reflux disease, erosive esophagitis, Barrett's esophagus, esophageal adenocarcinoma, erosive gastritis, gastric cancer, diarrhea, colonic diverticular disease, polyps, cancer, liver disease including nonalcoholic fatty liver disease, cirrhosis, hepatocellular carcinoma, gallstones, acute pancreatitis, and pancreatic cancer. Gastroenterologists are uniquely poised to participate in the multidisciplinary management of obesity as physicians caring for people with obesity-related diseases, in addition to their expertise in nutrition and endoscopic interventions.
Topics: Esophageal Diseases; Humans; Intestinal Diseases; Liver Diseases; Obesity; Pancreatic Diseases; Prevalence; Risk Factors; Stomach Diseases
PubMed: 28192107
DOI: 10.1053/j.gastro.2016.12.052 -
Current Opinion in Pharmacology Dec 2016The Hedgehog (Hh) signaling pathway not only plays a key part in controlling embryonic development, but in the adult stomach governs important cellular events such as... (Review)
Review
The Hedgehog (Hh) signaling pathway not only plays a key part in controlling embryonic development, but in the adult stomach governs important cellular events such as epithelial cell differentiation, proliferation, gastric disease, and regeneration. In particular, Sonic Hedgehog (Shh) signaling has been well studied for its role in gastric physiology and pathophysiology. Shh is secreted from the gastric parietal cells and contributes to the regeneration of the epithelium in response to injury, or the development of gastritis during Helicobacter pylori infection. Dysregulation of the Shh signaling pathway leads to the disruption of gastric differentiation, loss of gastric acid secretion and the development of cancer. In this chapter, we will review the most recent findings that reveal the role of Shh as a regulator of gastric physiology, regeneration, and disease.
Topics: Adult; Animals; Gastric Mucosa; Gastritis; Hedgehog Proteins; Helicobacter Infections; Helicobacter pylori; Humans; Signal Transduction; Stomach; Stomach Diseases; Stomach Neoplasms
PubMed: 27750091
DOI: 10.1016/j.coph.2016.09.003 -
Archives of Pathology & Laboratory... May 2016-The diagnosis of gastric epithelial lesions is difficult in clinical practice, even with the recent developments and advances in endoscopic modalities, owing to the... (Review)
Review
CONTEXT
-The diagnosis of gastric epithelial lesions is difficult in clinical practice, even with the recent developments and advances in endoscopic modalities, owing to the diverse morphologic features of the lesions, lack of standardized diagnostic criteria, and the high intraobserver and interobserver variabilities in the nonneoplastic (regenerative)-neoplastic spectrum.
OBJECTIVE
-To provide an overview of the current concepts and unresolved issues surrounding the diagnosis of diseases in the nonneoplastic-neoplastic spectrum, and to discuss some noteworthy properties and histologic features of gastric epithelial lesions.
DATA SOURCES
-A comprehensive assessment of the medical literature on gastric epithelial lesions was performed; we also interjected our own experiences into the discussion. Sources included original studies, review articles, and textbooks related to the field.
CONCLUSIONS
-Our literature review revealed that clear cell changes and micropapillary carcinoma components in gastric carcinomas are associated with poor clinical outcomes and should hence be included in pathologic reports. Moreover, we suggest a stepwise biopsy-endoscopic resection modality for the diagnosis of borderline neoplasia-nonneoplasia cases.
Topics: Biopsy; Carcinoma; Diagnosis, Differential; Early Detection of Cancer; Education, Medical, Continuing; Endoscopic Mucosal Resection; Gastric Mucosa; Humans; Neoplasm Grading; Pathology, Clinical; Precancerous Conditions; Stomach; Stomach Diseases; Stomach Neoplasms; Terminology as Topic; Workforce
PubMed: 27128297
DOI: 10.5858/arpa.2015-0300-RA