Abstract Title:

Wogonin prevents immunosuppressive action but not anti-inflammatory effect induced by glucocorticoid.

Abstract Source:

Dig Dis Sci. 2008 Jul;53(7):1774-84. Epub 2008 Mar 27. PMID: 17404053

Abstract Author(s):

Riyo Enomoto, Chie Suzuki, Chika Koshiba, Takayuki Nishino, Mikiko Nakayama, Hiroyuki Hirano, Toshio Yokoi, Eibai Lee


Glucocorticoid, such as dexamethasone, has anti-inflammatory and immunosuppressive action as major pharmacological effects. The latter action caused by lymphocyte apoptosis is not only a therapeutic effect but also an adverse reaction. Wogonin, a plant flavone found in Scutellaria baicalensis Georgi, inhibited dexamethasone-induced apoptotic changes, such as DNA fragmentation, nuclear condensation, phosphatidylserine translocation, and caspase activation in rat thymocytes. Since wogonin inhibited dexamethasone-induced DNA fragmentation in a noncompetitive manner, a target of this flavone is unlikely to be an antagonist of glucocorticoid receptor. Wogonin did not only act as an inhibitor of caspases, but also protected apoptosis induced by other glucocorticoids. Since wogonin reduced one of the major pharmacological effects of dexamethasone, we examined whether this flavone diminishes the anti-inflammatory action, another pharmacological effect. The anti-inflammatory action of dexamethasone was evaluated by carrageenan-induced paw edema model. Although dexamethasone significantly suppressed paw edema induced by carrageenan, wogonin had no effect on the anti-inflammatory action of dexamethasone. These results suggest that wogonin may be a useful compound to reduce the immunosuppressive side effect of glucocorticoid.

Study Type : Animal Study

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Sayer Ji
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