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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | O'yang, Counde Srinivasan, Dinesh Bley, Keith R. Bhattacharya, Anindya Ford, Anthony P. D. W. Jahangir, Alam Smith, Steven Daniels, Don V. Gever, Joel Jett, Mary-frances |
| Description | Author Affiliation: Bley KR ( Roche Palo Alto, Palo Alto, CA 94304, USA.) |
| Abstract | Prostacyclin (PGI2) possesses various physiological functions, including modulation of nociception, inflammation and cardiovascular activity. Elucidation of these functions has been hampered by the absence of selective IP receptor antagonists. Two structurally distinct series of IP receptor antagonists have been developed: 4,5-dihydro-1H-imidazol-2-yl)-[4-(4-isopropoxy-benzyl)-phenyl]-amine (RO1138452) and R-3-(4-fluoro-phenyl)-2-[5-(4-fluoro-phenyl)-benzofuran-2-ylmethoxycarbonylamino]-propionic acid (RO3244794).RO1138452 and RO3244794 display high affinity for IP receptors. In human platelets, the receptor affinities (pKi) were 9.3 +/- 0.1 and 7.7 +/- 0.03, respectively; in a recombinant IP receptor system, pKi values were 8.7 +/- 0.06 and 6.9 +/- 0.1, respectively. Functional antagonism of RO1138452 and RO3244794 was studied by measuring inhibition of carbaprostacyclin-induced cAMP accumulation in CHO-K1 cells stably expressing the human IP receptor. The antagonist affinities (pKi) of RO1138452 and RO3244794 were 9.0 +/- 0.06 and 8.5 +/- 0.11, respectively. Selectivity profiles for RO1138452 and RO3244794 were determined via a panel of receptor binding and enzyme assays. RO1138452 displayed affinity at I2 (8.3) and PAF (7.9) receptors, while RO3244794 was highly selective for the IP receptor: pKi values for EP1 (< 5), EP3 (5.38), EP4 (5.74) and TP (5.09). RO1138452 (1-10 mg kg(-1), i.v.) and RO3244794 (1-30 mg kg(-1), i.v.) significantly reduced acetic acid-induced abdominal constrictions. RO1138452 (3-100 mg kg(-1), p.o.) and RO3244794 (0.3-30 mg kg(-1), p.o.) significantly reduced carrageenan-induced mechanical hyperalgesia and edema formation. RO3244794 (1 and 10 mg kg(-1), p.o.) also significantly reduced chronic joint discomfort induced by monoiodoacetate. These data suggest that RO1138452 and RO3244794 are potent and selective antagonists for both human and rat IP receptors and that they possess analgesic and anti-inflammatory potential. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 3 |
| Volume Number | 147 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 2006-02-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Benzofurans Pharmacology Benzyl Compounds Imidazoles Propionates Receptors, Epoprostenol Antagonists & Inhibitors Animals CHO Cells Cricetinae Cyclic AMP Metabolism Dinoprostone Dose-Response Relationship, Drug Epoprostenol Hyperalgesia Drug Therapy Rats, Sprague-Dawley |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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