Characterization of Dopamine Receptor Subtypes Involved in Experimentally Induced Gastric and Duodenal Ulcers in Rats
| Autor: | N. S. Parmar, Jagruti K. Desai, Ramesh K. Goyal |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Atropine
Male Restraint Physical Agonist Peptic Ulcer medicine.medical_specialty Quinpirole Fenoldopam medicine.drug_class Cysteamine Pharmaceutical Science Severity of Illness Index Gastric Acid Dopamine receptor D1 Dopamine Internal medicine Dopamine receptor D2 Immersion medicine Animals Rats Wistar Ligation Pylorus Pharmacology Gastric Juice Receptors Dopamine D2 business.industry Receptors Dopamine D1 Stomach Benzazepines Pepsin A Bronchodilator Agents Rats Endocrinology Dopamine receptor Dopamine Agonists Dopamine Antagonists Female Sulpiride Gastrointestinal Hemorrhage business Histamine medicine.drug |
| Zdroj: | Journal of Pharmacy and Pharmacology. 51:187-192 |
| ISSN: | 2042-7158 0022-3573 |
| DOI: | 10.1211/0022357991772123 |
| Popis: | There are conflicting reports about the role of dopamine in gastric and duodenal ulcers. This investigation was undertaken to characterize the specific subtypes of dopamine receptor involved in gastric and duodenal ulceration. Administration of dopamine D1 agonist fenoldopam and dopamine D2 antagonist sulpiride elicited a significant decrease in acid secretion, total acid output, pepsin output and histamine content in the gastric juice, and reduced ulcer-index values, in pylorusligated rats. However, dopamine D1 receptor antagonist SCH 39166 ((-)-trans-6,7, 7a,8,9,13b-hexahydro-3-chloro-2-hydroxy-N-methyl-5H-benzo (d) naptho - (2,1-b) azepine) and the D2 receptor agonist quinpirole led to significant augmentation of these parameters compared with respective controls. In the restraint plus water-immersion stress model the score for intraluminal bleeding and the cumulative gastric lesion length was significantly lower for rats treated with fenoldopam and sulpiride. The opposite effects were observed after pretreatment of rats with SCH 39166 and quinpirole. In the cysteamine-induced duodenal ulcer model the mean ulcer area and the score for intensity were significantly lower for fenoldopam and sulpiride and higher for SCH 39166 and quinpirole. Our data suggest that the dopamine D1 and D2 receptors have opposite effects on gastric and duodenal ulcers. Whereas stimulation of dopamine D1 receptors inhibits the formation of gastric and duodenal ulcers, stimulation of dopamine D2 receptors has a pro-ulcerogenic effect. |
| Databáze: | OpenAIRE |
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