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| | Vasoreactivity in Rat Mesenteric Arteries In Vitro |
| Description: | Male rats (Sprague-Dawley; 200-250 g) were stunned and killed by cervical dislocation. The mesentery was removed and third-order arteries mounted in an automated tension myograph (Danish Myotechnology). After an equilibration period of 45 min, vessels were normalized and diameter determined. Following normalization, each vessel was contracted repeatedly with the thromboxane A2-mimetic 9,11-dideoxy-11α,9α-epoxymethano-prostaglandin F2α (U46619; 1 μM) until the response was reproducible. The vessels were then washed to restore basal tone before contracting to approximately 50% of the maximum U46619-induced response. Once a stable response to U46619 was achieved, cumulative concentration-response curves were constructed with a variety of NPR-C agonists of the invention at varying concentrations (0.001-30 μM), or vehicle (DMSO). In some studies, concentration-response curves to NPR-C agonists were conducted in the presence of the NPR-C antagonist M372049 (10 μM). Only one curve to any one agonist was constructed in any single tissue. |
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