Background: We previously found that persimmon leaf extract contains antiallergic substances that inhibit histamine release by human basophilic cell line KU812 in response to cross-linkage of FcϵRI. Objectives: The purpose of this study was to identify substances in the persimmon leaf extract that are responsible for the effect and to examine their in vivo effects on the allergic mouse model. Methods: HPLC analysis of persimmon leaf extract was done to measure its content. Inhibitory activity of persimmon leaf extract or its major constituent of flavonoids (astragalin) on the histamine release by KU812 cells was examined. To investigate the effects of these substances in vivo, models of passive cutaneous anaphylaxis and atopic dermatitis mice (NC/Nga) were used. Results: Persimmon leaf extract or astragalin inhibited histamine release from KU812 in response to cross-linkage of FcϵRI. Oral intake of both substances dose dependently inhibited passive cutaneous reactions. Moreover, oral administration of these substances to NC/Nga atopic dermatitis–model mice led to a striking suppression of the development of dermatitis, scratching behavior, and serum IgE elevation. Histologic analyses revealed that infiltration of inflammatory cells, especially degranulated mast cells, thickening of the epidermis, and prominent hyperkeratosis, were significantly reduced. Immunologic studies showed that the capacity of spleen T cells to produce both IL-4 and IL-13, but not IFN-γ, was downregulated by means of oral intake of these substances. Conclusion: This study demonstrates a novel activity of astragalin and the dramatic effect of persimmon leaf extract and astragalin on atopic dermatitis–model mice. (J Allergy Clin Immunol 2000;106:159-66.)

Persimmon leaf extract and astragalin inhibit development of dermatitis and IgE elevation in NC/Nga mice.

Phenols from Fagus sylvatica and their role in defence against Cryptococcus fagisuga.

A molecular docking study of EGCG and theaflavin digallate with the druggable targets of SARS-CoV-2.

Alcohol extracts of fourteen plants traditionally used in India for antiallergic disorders were evaluated for their antiallergic activity. Coleusforskohlii, Nyctanthes arbortristis, Pterocarpus san...

Antiallergic Activity of Some Traditional Indian Medicinal Plants

Tea, Camellia sinensis, L (O. Kuntze), which belongs to the family Theaceae, occurs in the natural environment of South East Asia. It is a cross-breeding plantation crop (Lupton 1984). There are mainly three varieties of the plant: Assam, Camellia assamica (Masters Wight), China, C. sinensis, L (O. Kuntze) and Cam-bod, C. assamica Sp. lasiocalyx (Planchom ex Watt Wight) tea.

Colour and Flavour Characteristics of Made Tea

Caffeine, theophylline, theobromine, (+) catechin, (-) epicatechin, gallic acid and theaflavin obtained from black tea ( CAMELLIA SINENSIS) inhibit passive cutaneous anaphylactic reaction in mice without affecting acetylcholine, histamine and serotonin induced broncho-constriction in the guinea pig. Theophylline and theaflavin antagonise only prostaglandin F 2 alpha induced bronchoconstriction.

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Inhibition of passive cutaneous anaphylaxis by compounds of Camellia sinensis.