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DOI: 10.1055/s-2000-8626
Pharmacological Effects of Urinary Products Obtained after Treatment with Saiboku-To, a Herbal Medicine for Bronchial Asthma, on Type IV Allergic Reaction
Publication History
Publication Date:
31 December 2000 (online)
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Abstract
To define the anti-allergic components in Saiboku-To, a herbal medicine for bronchial asthma, we examined the effects of 11 compounds found in post-administrative urine of Saiboku-To on concanavalin A-induced human lymphocyte blastogenesis in vitro and picryl chloride (PC)-induced mouse ear swelling in vivo. The urinary products of Saiboku-To were flavonoids and lignans derived from the constitutional herbs and their hydrogenated metabolites. Medicarpin derived from Glycyrrhiza glabra, magnolol and 8,9-dihydroxydihydromagnolol from Magnolia officinalis, baicalein, wogonin and oroxylin A from Suctellaria baicalensis inhibited lymphocyte blastogenesis in dose-dependent fashion with IC50 values ranging from 3.0 to 7.7 μg/mL, which corresponded to 20 - 100 times that of prednisolone IC50 (0.08 μg/mL). Davidigenin, dihydrowogonin and dihydrooroxylin A, which are hydrogenated metabolites of liquiritigenin, wogonin and oroxylin A, respectively, had no or little effects on lymphocyte blastogenesis. Oral administration of Saiboku-To, medicarpin, baicalein, magnolol and baicalin (100 mg/kg), inhibited PC-induced ear swelling significantly by 23.5, 40.1, 30.5, 23.6 and 20.9 %, respectively, though the effects were weaker than that of 5 mg/kg of prednisolone (52.9 %). The results suggested that flavonoids and lignans tested in the present study were implicated in anti-asthmatic effect of Saiboku-To through suppression of type IV allergic reaction.
Key words
Saiboku-To - Magnolia officinalis - Suctellaria baicalensis - Glycyrrhiza glabra - urinary products - type IV allergic reactions - lymphocyte blastogenesis - picryl chloride-induced mouse ear swelling
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D Ph Masato Homma
Department of Clinical Pharmacology Tokyo University of Pharmacy and Life Science
1432-1, Hachioji
Tokyo 192-0392
Japan
Email: masatoh-tuk@umin.ac.jp
Phone: +81-298-53-7025
Fax: +81-298-53-3859