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The Medical Implications of Gastrointestinal Vagal Afferent Pathways in Nausea and Vomiting

后脑区 医学 味觉厌恶 呕吐 恶心 麻醉 内科学 神经科学 胃排空 胃轻瘫 止吐药 心理学 中枢神经系统 品味
作者
Charles C. Horn
出处
期刊:Current Pharmaceutical Design [Bentham Science Publishers]
卷期号:20 (16): 2703-2712 被引量:33
标识
DOI:10.2174/13816128113199990568
摘要

Nausea and vomiting are biological systems for defense against food poisoning that are also provoked by numerous drugs (e.g., chemotherapy, anesthesia) and chronic diseases (e.g., cancer, diabetic gastroparesis). The sensory pathways that stimulate nausea and vomiting include vestibular, area postrema, and forebrain inputs, but gastrointestinal vagal afferent fibers arguably play the most prominent role as a first-line defense. Vagal sensory neurons detect toxins that enter the gastrointestinal lumen and transmit information to the hindbrain, leading to nausea (an unconditioned stimulus that serves to facilitate the avoidance of offending foods) and vomiting (a mechanism to clear contents from the stomach). Despite the major importance of these systems to human physiology, progress on the biological basis of nausea and vomiting has been slow – partly because laboratory rats and mice, which represent the largest thrust of preclinical biomedical research, lack a vomiting reflex (although they appear to have indices of nausea, e.g., conditioned food aversion). Several established models are a mainstay of preclinical nausea and vomiting research in academia and pharmaceutical companies, including the dog, cat, ferret, and musk shrew. An argument is made for broader testing across species since each model possesses often unique experimental advantages and sensitivity to emetic and antiemetic agents. This review focuses on the state of knowledge on the neural pathways for nausea and vomiting, behavioral indices of nausea used in preclinical models, role of vagal afferent fibers, current antiemetic and antinausea treatments, and potential future directions. Keywords: Vomiting, nausea, emesis, pica, conditioned taste aversion and vagus.
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