Silibinin Inhibits LPS-Induced Macrophage Activation by Blocking p38 MAPK in RAW 264.7 Cells
Biomolecules & Therapeutics
;
: 258-263, 2013.
Article
in English
| WPRIM
| ID: wpr-59935
ABSTRACT
We demonstrate herein that silibinin, a polyphenolic flavonoid compound isolated from milk thistle (Silybum marianum), inhibits LPS-induced activation of macrophages and production of nitric oxide (NO) in RAW 264.7 cells. Western blot analysis showed silibinin inhibits iNOS gene expression. RT-PCR showed that silibinin inhibits iNOS, TNF-alpha, and IL1beta. We also showed that silibinin strongly inhibits p38 MAPK phosphorylation, whereas the ERK1/2 and JNK pathways are not inhibited. The p38 MAPK inhibitor abrogated the LPS-induced nitrite production, whereas the MEK-1 inhibitor did not affect the nitrite production. A molecular modeling study proposed a binding pose for silibinin targeting the ATP binding site of p38 MAPK (1OUK). Collectively, this series of experiments indicates that silibinin inhibits macrophage activation by blocking p38 MAPK signaling.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Phosphorylation
/
Binding Sites
/
Models, Molecular
/
Gene Expression
/
Adenosine Triphosphate
/
Blotting, Western
/
Tumor Necrosis Factor-alpha
/
Silybum marianum
/
MAP Kinase Signaling System
/
P38 Mitogen-Activated Protein Kinases
Type of study:
Prognostic study
Language:
English
Journal:
Biomolecules & Therapeutics
Year:
2013
Type:
Article
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