Abstract:
:We isolated the 4 kinds of flavonoids from strawberry 'Nohime' and examined the effect of these flavonoids on the degranulation in RBL-2H3 cells. The flavonoids were found to suppress the degranulation from Ag-stimulated RBL-2H3 cells to different extents. To disclose the inhibitory mechanism of degranulation by flavonoids, we examined their effects on the intracellular free Ca(2+) concentration ([Ca(2+)]i) and the intracellular signaling pathway such as Lyn, Syk, and PLCgammas. The intracellular free Ca(2+) concentration ([Ca(2+)]i) was elevated by Fc epsilonRI activation, but these flavonoid treatments reduced the elevation of [Ca(2+)]i by suppressing Ca(2+) influx. Kaempferol strongly suppressed the activation of Syk and PLCgammas. It was thus suggested that suppression of Ag-stimulated degranulation by the flavonoids is mainly due to suppression of [Ca(2+)]i elevation and Syk activation. These results suggested that strawberry would be of some ameliorative benefit for the allergic symptoms.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Itoh T,Ninomiya M,Yasuda M,Koshikawa K,Deyashiki Y,Nozawa Y,Akao Y,Koketsu Mdoi
10.1016/j.bmc.2009.06.050subject
Has Abstractpub_date
2009-08-01 00:00:00pages
5374-9issue
15eissn
0968-0896issn
1464-3391pii
S0968-0896(09)00620-8journal_volume
17pub_type
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