reagents, and drugs
used throughout this study were obtained from commercial sources and
used as received. We purchased λ-carrageenan, prostaglandin
E2 (PGE2), dextran, histamine, compound 48/80 (4-methoxy-3,5-bis[[2-methoxy-5-[2-(methylamino)ethyl]phenyl]methyl]-N-methyl-benzeneethanamine, trihydrochloride (C32H45N3O3·3HCl)), dimethylsulfoxide
(DMSO), acetic acid, and formaldehyde from Sigma-Aldrich (St Louis,
MO). Morphine, naloxene, and heparin were acquired from Merck (São
Paulo, SP, Brazil). All drugs were dissolved in sterile saline solution
(0.9%), except AA, which was solubilized in 5% DMSO, and subsequently
diluted in 0.9% NaCl (Vehicle). AA was extracted, isolated, and identified
as described by Gomes Júnior and co-workers.66 (link)