氧化应激
胃粘膜
炎症
活性氧
胃肠道
细胞凋亡
免疫学
医学
抗氧化剂
药理学
癌症研究
胃
生物
内科学
细胞生物学
生物化学
作者
Martha Lucinda Contreras-Zentella,Marisela Olguín-Martínez,Lourdes Sánchez-Sevilla,Rolando Hernández‐Muñoz
出处
期刊:Elsevier eBooks
[Elsevier]
日期:2017-01-01
卷期号:: 65-79
被引量:3
标识
DOI:10.1016/b978-0-12-805377-5.00005-9
摘要
Gastric and intestinal mucosa are continuously exposed to external and internal oxidants, such as cigarette smoking, alcohol, nonsteroidal antiinflammatory drugs, ischemia-reperfusion injury, chronic infections, and inflammatory disorders, making the gastrointestinal (GI) tract quite susceptible to ROS attack. In the normal cellular aerobic metabolism, the GI tract, can produce these reactive species as intermediates. Nonetheless, the cells from the gastric mucosa, having enzymatic or nonenzymatic antioxidant systems, protect them from the deleterious effects of ROS. Moreover, despite the protective barrier provided by the mucosa, microbial pathogens can induce oxidative injury and GI inflammatory responses, where the hypersecretion of gastric acid plays a relevant role. Nevertheless, it has also been shown that the timing and the magnitude of the lipoperoxidative events derived from ROS, could synchronize the cell proliferative and apoptotic events in the gastric mucosa. Probably, this is fundamental for the progression of the cell proliferation in the human gastric adenocarcinoma.
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