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ome publications have described the pharmacological properties of latices proteins. Thus, in the present study proteins from Plumeria pudica Jacq., Apocynaceae, latex were evaluated for anti-inflammatory and antinociceptive activities. Obtained data showed that an intraperitoneal administration of different doses of latex was able to reduce the paw edema induced by carrageenan in a dose-dependent manner (better dose 40 mg/kg; 72.7% inhibition at 3rd and 78.7% at 4th hour) and the edema induced by dextran (40 mg/kg; 51.5% inhibition at 30 min and 93.0% at 1st hour). Inhibition of edema induced by carrageenan was accompanied by a reduction of myeloperoxidase activity. Pre-treating animals with latex (40 mg/kg) also inhibited the paw edema induced by histamine, serotonin, bradykinin, prostaglandin E2, compound 48/80. Additionally, the latex (40 mg/kg) reduced the leukocyte peritoneal migration induced by carrageenan and this event was followed by reduction of IL-1β and TNF-α in peritoneal fluid. The latex-treatment (40 mg/kg) reduced the animal abdominal constrictions induced by acetic acid and the first phase on paw licking model induced by formalin. When latex was treated with heat (at 100 °C for 30 min), anti-edematogenic and myeloperoxidase activities were significantly reduced, indicating the involvement of heat-sensitive proteins on anti-inflammatory effect. Our results evidence that latex fluids are a source of proteins with pharmacological properties

revista brasileira de farmacognosia

Laticifer proteins from Plumeria pudica inhibit the inflammatory and nociceptive responses by decreasing the action of inflammatory mediators and pro-inflammatory cytokines