Effects of omapatrilat on blood pressure and insulin sensitivity in an animal model of insulin resistance

Objective: To assess the effects of omapatrilat, fosinopril and placebo on blood pressure, plasma insulin, glucose and triglycerides concentrations in Zucker rats, a model for insulin resistance. Design: Double blind, paralle l, prospective trial. Methods: Forty-two male obese Zucker (falfa) rats (ag ed 13-18 week) initially weighing 400-600 g were used for the experiments. Omapatrilat (n = 14), placebo (n = 14) or fosinopril (n = 14) were administ rated once daily at 10 mu mol/kg oral for 15 days. At baseline and at the e nd of the study, a tail-cuff blood pressure measurement was performed; an o ral glucose tolerance test was done at the end of the study. Results: Omapa trilat and fosinopril resulted in significant lower systolic blood pressure compared to the placebo group (p < 0.001). This parameter was significantl y lower in the omapatrilat group compared with fosinopril-treated rats (116 +/- 9 vs 125 +/- 4 mmHg, p < 0.05). After an overnight fast, there was no difference in the fasting glucose concentrations among treatment groups. Th e basal and post-glucose challenge insulin concentrations were lower in the omapatrilat group compared to the placebo group. No difference was observe d in the fasting triglycerides concentrations between the treatment groups. Conclusions: Compared to placebo and fosinopril treatment, omapatrilat res ults in lower arterial blood pressure in an animal model of insulin resista nce. The results suggest that omapatrilat may have a positive effect on ins ulin sensitivity.