Andrographolide Inhibits Nuclear Factor-kappa B Activation through JNK-Akt-p65 Signaling Cascade in Tumor Necrosis Factor-alpha-Stimulated Vascular Smooth Muscle Cells

doi:10.1155/2014/130381

CNU IR > Pharmacy and Science > Dept. of Pharmacy > Periodical Articles > Item 310902800/28502

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Title:	Andrographolide Inhibits Nuclear Factor-kappa B Activation through JNK-Akt-p65 Signaling Cascade in Tumor Necrosis Factor-alpha-Stimulated Vascular Smooth Muscle Cells
Authors:	Chen, Yu-Ying Hsu, Ming-Jen Hsieh, Cheng-Ying Lee, Lin-Wen Chen, Zhih-Cherng Sheu, Joen-Rong
Contributors:	藥學系
Keywords:	PATHWAY ATHEROSCLEROSIS DISEASE PROTEIN TNF AKT PHOSPHORYLATION PROLIFERATION INFLAMMATION SUPPRESSION
Date:	2014
Issue Date:	2015-05-06 21:18:35 (UTC+8)
Publisher:	Hindawi Publishing Corporation
Abstract:	Critical vascular inflammation leads to vascular dysfunction and cardiovascular diseases, including abdominal aortic aneurysms, hypertension, and atherosclerosis. Andrographolide is the most active and critical constituent isolated from the leaves of Andrographis paniculata, a herbal medicine widely used for treating anti-inflammation in Asia. In this study, we investigated the mechanisms of the inhibitory effects of andrographolide in vascular smooth muscle cells (VSMCs) exposed to a proinflammatory stimulus, tumor necrosis factor-alpha (TNF-alpha). Treating TNF-alpha-stimulated VSMCs with andrographolide suppressed the expression of inducible nitric oxide synthase in a concentration-dependent manner. A reduction in TNF-alpha-induced c-Jun N-terminal kinase (JNK), Akt, and p65 phosphorylation was observed in andrographolide-treated VSMCs. However, andrographolide affected neither I kappa B alpha degradation nor p38 mitogen-activated protein kinase or extracellular signal-regulated kinase 1/2 phosphorylation under these conditions. Both treatment with LY294002, a phosphatidylinositol 3-kinase/Akt inhibitor, and treatment with SP600125, a JNK inhibitor, markedly reversed the andrographolide-mediated inhibition of p65 phosphorylation. In addition, LY294002 and SP600125 both diminished Akt phosphorylation, whereas LY294002 had no effects on JNK phosphorylation. These results collectively suggest that therapeutic interventions using andrographolide can benefit the treatment of vascular inflammatory diseases, and andrographolide-mediated inhibition of NF-kappa B activity in TNF-alpha-stimulated VSMCs occurs through the JNK-Akt-p65 signaling cascade, an I kappa B alpha-independent mechanism.
Relation:	Scientific World Journal, 130381
Appears in Collections:	[Dept. of Pharmacy] Periodical Articles

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