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Objective: Pharmacological effects of carvacrol such as its anti-inflammatory activities have been shows. In this study the effects of carvacrol on serum levels of total protein (TP), phospholipase A2 (PLA2) and histamine in sensitized guinea pigs was evaluated. Materials and Methods: Sensitized guinea pigs were given drinking water alone (group S), drinking water containing three concentrations of carvacrol (40, 80 and 160 µg/ml) or dexamethasone. Serum levels of TP, PLA2 and histamine were examined I all sensitized groups as well as a non-sensitized control group (n=6 for each group). Results: In sensitized animals, serum levels of TP, PLA2 and histamine were significantly increased compared to control animals (p<0.05 to p<0.001). Significant reduction in TP, PLA2 and histamine levels were observed in treated groups with the two higher concentrations of carvacrol but dexamethasone treatment only decreased serum level of PLA2 (p<0.05 to p<0.001). Although the effect of the lowest concentration of the extract was less than that of dexamethasone (p<0.05 for TP and p<0.001 for PLA2), the effects of the two higher concentrations on PLA2 were similar to dexamethasone and on TP (p<0.01) and histamine (p<0.001) were higher than those of dexamethasone. Conclusion: These results showed that carvacrol reduced serum levels of TP, PLA2 and histamine in sensitized guinea pigs which may indicate an anti-inflammatory effect of this agent in inflammatory disorders such as asthma.

Carvacrol attenuates serum levels of total protein, phospholipase A2 and histamine in asthmatic guinea pig