Effect of alkaloidal fraction of aqueous extract of T. malabarica (Tm) was studied on humoral antibody responses in rats and guineapigs. The anti-SRBC haemagglutination titre was found to be enhanced in rats pretreated with Tm (2.5 mg/kg). Passive cutaneous anaphylaxis (PCA) in rats was also increased in Tm treated group. In vitro experiments with sensitized rat peritoneal mast cells showed a significant decrease in antigen-induced various spasmogens on isolated guineapig ileum.
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