Abstract:
:The anti-allergic activity of the 50% methanol extract of Citrus unshiu powder (MEC) was examined. Fifty percent methanol extract of MEC powder showed potent inhibitory activity against histamine release from basophils of patients suffering from seasonal allergic rhinitis to ceder pollen. To examine this anti-allergic mechanism in detail, we next used rat basophlilic leukemia RBL-2H3 cells. MEC significantly inhibited IgE-induced histamine and beta-hexosaminidase release from RBL-2H3 cells. Since MEC contains a variety of flavonoids, we selected nobiletin, hesperetin, and hesperidin (hesperetin glycoside) as representative compounds, and further evaluated these inhibitory activities. Among the flavonoids tested, hesperetin was the most potent, while hesperidin had far less, if any, inhibitory activity. The mechanism by which flavonoids inhibited the degranulation process was then examined. As a result, hesperetin and nobiletin suppressed the phosphorylation of Akt-1, direct downstream effector of phosphatidylinositol 3-kinase (PI3-K). Thus, it was assumed that these flavonoids suppressed IgE-mediated stimulation of basophils through PI3-K pathway and that proper intake of Citrus unshiu would be favorable for managing seasonal allergic rhinitis to ceder pollen.
journal_name
Int J Mol Medjournal_title
International journal of molecular medicineauthors
Kobayashi S,Tanabe Ssubject
Has Abstractpub_date
2006-03-01 00:00:00pages
511-5issue
3eissn
1107-3756issn
1791-244Xjournal_volume
17pub_type
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