Inhibitory effects of adlay bran (Coix lachryma-jobi L. var. ma-yuen Stapf) on chemical mediator release and cytokine production in rat basophilic leukemia cells

Feb 23, 2012Journal of ethnopharmacology

Adlay bran reduces chemical signals and immune responses in rat allergy-like cells

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Abstract

A concentration of 40.8μg/mL of the ethyl acetate fraction of adlay bran effectively inhibited mast cell degranulation.

The ethyl acetate fraction of adlay bran inhibited histamine release with an IC(50) of 71-87μg/mL.
Adlay bran suppressed the secretion of interleukins IL-4, IL-6, and tumor necrosis factor-α in RBL-2H3 cells.
It reduced intracellular production of reactive oxygen species and inhibited the phosphorylation of Akt.
The extract decreased the expression of protein kinase C.
Luteolin, one of the isolated compounds, exhibited potent inhibitory activity with an IC(50) of 1.5μg/mL.

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ETHNOPHARMACOLOGICAL RELEVANCE: Adlay (Job's tears, Coix lachryma-jobi L. var. ma-yuen Stapf) has long been used in China to treat rheumatism.

AIM OF THE STUDY: We investigated the anti-allergic effects of adlay bran on rat basophilic leukemia (RBL)-2H3 cells.

MATERIALS AND METHODS: To evaluate the anti-allergic effects of adlay bran, the release of histamines and cytokines were measured using ELISA. To explore the mechanism of these effects, the protein expression levels were determined using western blotting.

RESULTS: A 40.8μg/mL concentration of the ethyl acetate fraction of the ethanolic extracts of adlay bran (ABE-EtOAc) effectively inhibited mast cell degranulation. The 40-100% EtOAc/Hex subfractions of ABE-EtOAc inhibited histamine release with an IC(50) of 71-87μg/mL. Moreover, the ABE-EtOAc subfractions suppressed the secretion of interleukin (IL)-4, IL-6 and tumor necrosis factor-α in the RBL-2H3 cells, indicating that adlay bran can inhibit cytokine secretion in the late phase of the allergic reaction. In addition, adlay bran reduced the intracellular production of reactive oxygen species, inhibited the phosphorylation of Akt and decreased the expression of protein kinase C. Furthermore, six phenolic acids and one flavone were isolated. Of these compounds, luteolin showed the most potent inhibitory activity (IC(50)=1.5μg/mL).

CONCLUSION: Adlay bran extract reduced the release of histamines and cytokines and suppressed the production of Akt. These combined effects influenced the signal transduction in RBL-2H3 cells, thereby revealing the mechanisms of the anti-allergic effects of adlay.

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Inhibitory effects of adlay bran (Coix lachryma-jobi L. var. ma-yuen Stapf) on chemical mediator release and cytokine production in rat basophilic leukemia cells

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