Abstract
We hypothesized that renin-angiotensin system and neprilysin (NEP) inhibition can modulate the nociceptive parameters on hypertensive rats. The aim of this study is to assess the preventive and therapeutic effects of ramipril and sacubitril on the pain hypersensitivities, and their interaction mechanisms with high blood pressure. Antinociceptive effects of ramipril and sacubitril were compared with those of diclofenac. Threshold of pain assesments were recorded before drugs administration. After a 18 days treatment, normotensive and dexamethasone-induced hypertensive rats were evaluated on thermal hyperalgesia and mechanical allodynia tests. Blood pressure of rats were verified by mean arterial pressure measurement. Hypertensive rats showed significantly high pain threshold on thermal plantar test compared to that of normotensives. Among hypertensive rats, pain hypersensitivity was lowest in diclofenac group, followed by sacubitril group, while ramipril caused increased thermal and mechanical hypersensitivities. We found that NEP inhibition may play a role in nociception in hypertensive rats. NEP inhibitors may be suitable choice for the management of hypertension and pain because of their therapeutic and preventive effects on nociception and arterial blood pressure.
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