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Objective: Inflammation underlies the pathological basis of most diseases. Substance-P is a key mediator that participates in various inflammatory processes and painful conditions. Mast cells (MCs) have a key role in inflammatory processes via mediators released from their granules. The experimental models for the investigation of pathogenesis and treatment of inflammatory diseases represent merely certain characteristics of inflammatory cases, therefore, more comprehensive models are required. We aimed to compare effects of administrations of the compound-48/80 and mast cell mediator suspension (MCMS) obtained from peritoneal MCs on the inflammation in rats. Methods: Rats were divided into five groups (n=6): Intraperitoneally, Control group received 0.2 ml saline; C-48/80 group received 2 mg/kg compound-48/80; MCMS group received 0.2 ml MCMS; Cr+C-48/80 group received 10 mg/kg cromolyn plus compound-48/80; Cr+MCMS group received cromolyn plus MCMS. Potent inflammatory markers, plasma substance-P levels, and number and degranulation of dural MCs were measured. Data were analyzed using one-way ANOVA followed by Dunnett’s post hoc test. Results: Compound-48/80 increased plasma substance-P levels (p<0.05) and dural MC-degranulation (p<0.001). Likewise, MCMS increased substance-P levels and dural MC-degranulation (p<0.001) as well as number of dural MCs (p<0.01). MC stabilizer cromolyn inhibited increases in the parameters induced by compound-48/80 and MCMS (p<0.01 and p<0.05, respectively). Conclusion: MCMS administration had greater impact to increase the plasma substance-P levels and number and degranulation of dural MCs than that of the compound-48/80 administration. The results demonstrate the potent inflammatory effect of MCMS treatment over the compund-48/80 administration. Administration of MCMS could be a useful tool to study inflammatory conditions.

clinical and experimental health sciences

The comparison of effects of applications of compound 48/80 and mast cell mediator suspension on inflammation in rats: A methodological study for acute inflammatory pain