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Columbia team finds that gastrin plays significant role in helicobacter-induced stomach cancer
June 25, 2009A group led by Columbia University Medical Center's Timothy Wang, M.D., has studied the role of Helicobacter infection in the development of stomach cancer and found that the hormone gastrin, which stimulates secretion of gastric acid, plays a key role in the development of Helicobacter-induced stomach cancer, and may have distinct effects on carcinogenesis in different parts of the stomach.
More than 50 percent of the world's population is infected with Helicobacter, which causes chronic inflammation of the stomach lining and is strongly linked to the development of gastric ulcers and stomach cancer. Stomach cancer is the second leading cause of cancer-related deaths worldwide.
Helicobacter infection results in increased expression of gastrin, although its role in cancer development has been unclear. High levels of gastrin lead to the development of stomach cancer, but absence of gastrin has been shown to increase the numbers of tumors in the gastric antrum, the lower section of the stomach that empties into the small intestine.
To reconcile this apparent incongruity, a group led by Dr. Wang studied Helicobacter infection and stomach cancer in animal models with either high expression of gastrin or no gastrin at all. They found that Helicobacter infection in mice with high levels of gastrin resulted in cancer of the gastric corpus (main body of the stomach), whereas infection in gastrin-deficient mice developed cancer in the gastric antrum.
The latest research by Dr. Wang and his colleagues appears in the July 2009 issue of The American Journal of Pathology.
Dr. Wang, with CUMC's Dr. Shigeo Takaishi, and their colleagues, argue that gastrin may serve as a "rheostat" for the stomach. Gastrin likely plays a central role in the safety network for the protection from mucosal damage caused by gastric acid secretion induced by gastrin itself, and thus either too much or too little gastrin could predispose a person to stomach cancer. Therefore, clinicians in the future may need to be more careful about prescribing acid-suppressive drugs for long-term use in patients infected with Helicobacter, Dr. Wang says.
In future studies, Dr. Wang and colleagues plan to study "host factors other than gastrin that are also important for Helicobacter-associated gastric carcinogenesis." These include specific cytokines and chemokines induced by Helicobacter infection and modulated by gastrin, that link inflammation and cancer. In addition, they plan to study the role of other non-Helicobacter bacteria that colonize the stomach when acid secretion is suppressed, since bacterial overgrowth likely contributes to gastric carcinogenesis.
Columbia University Medical Center
To reconcile this apparent incongruity, a group led by Dr. Wang studied Helicobacter infection and stomach cancer in animal models with either high expression of gastrin or no gastrin at all. They found that Helicobacter infection in mice with high levels of gastrin resulted in cancer of the gastric corpus (main body of the stomach), whereas infection in gastrin-deficient mice developed cancer in the gastric antrum.
The latest research by Dr. Wang and his colleagues appears in the July 2009 issue of The American Journal of Pathology.
Dr. Wang, with CUMC's Dr. Shigeo Takaishi, and their colleagues, argue that gastrin may serve as a "rheostat" for the stomach. Gastrin likely plays a central role in the safety network for the protection from mucosal damage caused by gastric acid secretion induced by gastrin itself, and thus either too much or too little gastrin could predispose a person to stomach cancer. Therefore, clinicians in the future may need to be more careful about prescribing acid-suppressive drugs for long-term use in patients infected with Helicobacter, Dr. Wang says.
In future studies, Dr. Wang and colleagues plan to study "host factors other than gastrin that are also important for Helicobacter-associated gastric carcinogenesis." These include specific cytokines and chemokines induced by Helicobacter infection and modulated by gastrin, that link inflammation and cancer. In addition, they plan to study the role of other non-Helicobacter bacteria that colonize the stomach when acid secretion is suppressed, since bacterial overgrowth likely contributes to gastric carcinogenesis.
Columbia University Medical Center
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Three-day-old broccoli sprouts, a widely available human food, suppressed Helicobacter pylori (H. pylori) infections, according to a report in Cancer Prevention Research, a journal of the American Association for Cancer Research. H. pylori infections are one of the most common bacterial infections worldwide and are a major cause of stomach cancer.
Gutsy germs succumb to baby broccoli
A small, pilot study in 50 people in Japan suggests that eating two and a half ounces of broccoli sprouts daily for two months may confer some protection against a rampant stomach bug that causes gastritis, ulcers and even stomach cancer.
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100 Q&A About Gastric Cancer (100 Questions & Answers about . . .) (100 Questions and Answers) by Manish A. Shah (Author) About 21,700 Americans are diagnosed with stomach cancer each year and it occurs most often in people in their 60s and 70s. Whether you're a newly diagnosed patient with gastric cancer or a friend or relative of someone with cancer, this book offers help. This book is an invaluable resource for anyone coping with the physical and emotional turmoil of this disease. The author Dr. Shah is from Memorial Sloan-Kettering Cancer Center, one of the few National Cancer Institute-designated cancer centers with a specific program in treating cancers of the upper gastrointestinal tract and has made many of the major advances in the treatment of these diseases. |
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Classic Cancer Films DVD: 1940s - 1960s Lung, Stomach, & Skin Cancer And Tumors Awareness & Prevention Films Cancer awareness did not begin until the mid-20th century. This is a special compilation of cancer-related films from the 1940s, 50s & 60s. Skin cancer, stomach cancer, lung cancer and more is covered. This DVD has 6 great films and over 110 minutes of rare video about the history of cancer. Table Of Contents: (1) At the End of the Rainbow (1946) - This is a film about ultra-violet light and its health benefits. However, the footage is startling because it shows lots of people (and a baby!) being exposed, sans protection, to the harmful lights being touted as life savers. This exposure has been shown to give skin cancer since the making of this film - 24 minutes (2) Cancer (1940s) - This early cancer information film talks about many of the warning signs and treatment options for cancer.... |
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