Journal Article

Lucidenic acid inhibits PMA-induced invasion of human hepatoma cells through inactivating MAPK/ERK signal transduction pathway and reducing binding activities of NF-κB and AP-1

Chia-Jui Weng, Chi-Fai Chau, Yih-Shou Hsieh, Shun-Fa Yang and Gow-Chin Yen

in Carcinogenesis

Volume 29, issue 1, pages 147-156
Published in print January 2008 | ISSN: 0143-3334
Published online November 2007 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgm261
Lucidenic acid inhibits PMA-induced invasion of human hepatoma cells through inactivating MAPK/ERK signal transduction pathway and reducing binding activities of NF-κB and AP-1

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Ganoderma lucidum has been reported to be associated with suppressed motility, invasion and metastasis of several types of cancers, but its mechanism of action remains unclear. In our previous study, lucidenic acids A, B, C and N were isolated from a new strain of G.lucidum and all of them were found to have potential anti-invasive activity on phorbol-12-myristate-13-acetate (PMA)-induced HepG2 cells by suppressing the matrix metalloproteinase (MMP)-9 activity. Here, the lucidenic acid B (LAB) was used to explore its mechanisms underlying MMP-9 expression of HepG2 cells. The results showed that the LAB suppressed PMA-induced MMP-9 activity in a dose-dependent transcriptional level. The suppression of PMA-induced MMP-9 expression of HepG2 cells by LAB was through inactivating phosphorylation of extracellular signal-regulated kinase (ERK) 1/2. The treatment of mitogen-activated protein kinase kinase (MEK) inhibitors (PD98059 and U0126) and LAB to HepG2 cells could result in a synergistic reduction on the MMP-9 expression along with an inhibition on cell invasion. Moreover, LAB also strongly inhibited PMA-stimulated nuclear factor-kappa B (NF-κB) and activator protein-1 (AP-1) DNA-binding activities of HepG2 cells in dose-dependent manners. A dose-dependent inhibition on protein levels of NF-κB, c-Jun and c-Fos in nuclear by LAB treatment was further observed. In conclusion, we demonstrated that the anti-invasive effects of the LAB on the PMA-induced HepG2 cells might be through inhibiting the phosphorylation of ERK1/2 and reducing AP-1 and NF-κB DNA-binding activities, leading to downregulation of MMP-9 expression.

Journal Article.  5949 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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