To determine if NO production was required for the development of COMT-dependent pain, individual groups of animals received i.p L-NAME (30 mg/kg) or vehicle 30 min before i.p. Results showed that animals receiving OR486 exhibited higher levels of NO derivatives, tumor necrosis factor (TNF), interleukin-1 (IL-1), interleukin-6 (IL-6), and chemokine […]