Des-aspartate-angiotensin I causes specific release of PGE2 and PGI2 in HUVEC via the angiotensin AT1 receptor and biased agonism
| Autor: | Kok-Onn Lee, Qiang Wen, Sai Zhen Sim, Xiao Guang Xu, M.K. Sim |
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| Rok vydání: | 2015 |
| Předmět: |
Agonist
medicine.medical_specialty Receptor complex Angiotensin receptor Time Factors medicine.drug_class Dinoprostone Receptor Angiotensin Type 1 Internal medicine Renin–angiotensin system medicine Human Umbilical Vein Endothelial Cells Humans Pharmacology Angiotensin II receptor type 1 Arachidonic Acid biology Chemistry Angiotensin-converting enzyme Angiotensin II Epoprostenol Endocrinology Losartan cardiovascular system biology.protein lipids (amino acids peptides and proteins) Angiotensin I circulatory and respiratory physiology medicine.drug |
| Zdroj: | European journal of pharmacology. 768 |
| ISSN: | 1879-0712 |
| Popis: | DAA-I (des-aspartate-angiotensin I), an endogenous angiotensin, had been shown earlier to ameliorate animal models of cardiovascular diseases via the angiotensin AT1 receptor and prostaglandins. The present study investigated further the action of DAA-I on the release of PGE2, PGI2, PGF2α and TXA2 in HUVEC. 10(-11)-10(-8)M DAA-I and 15min incubation specifically released PGE2 and PGI2. The release was inhibited by losartan and indomethacin but not by PD123319 and NS398 indicating that the angiotensin AT1 receptor and COX-1 mediate the release. At concentrations higher than 10(-7)M, DAA-I mimics the action of angiotensin II by releasing TXA2 but had no effect on the production of PGF2α. At similar concentrations and 4h incubation, DAA-I increased the release of the 4 prostaglandins via the angiotensin AT1 receptor and COX-2, again mimicking the action of angiotensin II. HUVEC that were preincubated with DAA-I or angiotensin II, released similar profiles of prostaglandins when incubated with arachidonic acid after the angiotensin had been washed off. We postulate that the internalized DAA-I/receptor complex remains active and mediates the conversion of arachidonic acid to the respective prostaglandins. The release of PGE2 and PGI2 via the angiotensin AT1 receptor and COX-1 is a novel specific action of DAA-I and is likely responsible for its beneficial effects seen in earlier studies. This specific action is definable as a biased agonism of the angiotensin AT1 receptor, which identifies DAA-I as a novel biased agonist and potential therapeutic that is able to produce specific prostaglandins at nanomolar concentrations. |
| Databáze: | OpenAIRE |
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