Myrrh and Chamomile Flower Extract Inhibit Mediator Release from IgE-stimulated Mast-Cell-Like RBL-2H3 Cells.

Recent clinical evidence supports the efficacy of a traditional medicinal product (TMP) containing a combination of myrrh ( (Nees) Engl.), coffee charcoal ( L.), and chamomile flower dry extract ( L.) in the therapy of diarrhea and inflammatory bowel disease. Mast cells seem to play a key role in the symptom generation of irritable bowel syndrome (IBS). To evaluate the use of the TMP in IBS treatment, the effects of the herbal extracts on the release of mast-cell mediators from stimulated RBL-2H3 cells were investigated. Therefore, degranulation was induced by phorbol-12-myristate-13-acetate (PMA) and calcium ionophore A13187 (CI) or IgE stimulation, and the amounts of released β-hexosaminidase and histamine were quantified. The extracts showed no effect on the mediator release of PMA- and CI-stimulated RBL-2H3 cells. Myrrh and chamomile were able to reduce the β-hexosaminidase release of IgE-stimulated cells, while myrrh showed stronger inhibition of the mediator release than chamomile, which reduced only IgE-stimulated histamine release. Thus, these results indicate a mechanistic basis for the use of the herbal combination of myrrh, coffee charcoal, and chamomile flower extract in the symptom-oriented treatment of IBS patients with diarrheal symptoms.