Abstract：
:Endogenous prostaglandins (PGs) play an important role in modulating the mucosal integrity and various functions of the alimentary tract, and E type PGs are most effective in these actions. PGE2 protects against acid reflux esophagitis and affords gastric cytoprotection against ethanol and indomethacin. These effects are mimicked by EP1 agonists and attenuated by an EP1 antagonist. Adaptive cytoprotection induced by mild irritants is also attenuated by the EP1 antagonist as well as indomethacin. PGs contribute to capsaicin-induced gastric cytoprotection, yet this effect is mitigated by indomethacin and sensory deafferentation but not the EP1 antagonist. Similarly, PGE2 does not exhibit gastric cytoprotection in EP1-receptor knockout mice, while capsaicin-induced protection is observed in animals lacking either EP1 receptors but disappears in IP-receptor knockout mice. In the duodenum, acid perfusion produces damage in animals lacking EP3 receptors. The protective effect of PGE2 on indomethacin-induced small intestinal damage is mimicked by both EP3 and EP4 agonists. PGE2 also shows a healing-promoting effect on gastric ulcers as well as intestinal lesions via the activation of EP4 receptors. The underlying mechanisms of these actions of PGE2 in the stomach, duodenum, or small intestine are related to inhibition of stomach contraction (EP1), stimulation of duodenal HCO3- secretion (EP3/EP4), or suppression of bacterial invasion due to inhibition of intestinal contraction (EP4) and stimulation of mucus secretion (EP3/EP4) respectively, although the mechanisms related to the esophageal protection remain unknown. Furthermore, the healing-promoting effect is associated with the stimulation of angiogenesis via an increase in VEGF expression (EP4).
journal_name
Adv Clin Chemjournal_title
Advances in clinical chemistryauthors
Takeuchi Kdoi
10.1016/s0065-2423(10)51005-9subject
Has Abstractpub_date
2010-01-01 00:00:00pages
121-44eissn
0065-2423issn
2162-9471journal_volume
51pub_type
杂志文章,评审abstract：:The abnormal breakdown of circulating red blood cells (RBCs), also known as hemolysis, is a significant clinical issue that can present as a primary disorder or arise secondary to another disease process. The evaluation for pathologic hemolysis (and the establishment of a hemolytic disorder) is heavily dependent on as...
journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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journal_title：Advances in clinical chemistry
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