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Title: Pachymic acid impairs breast cancer cell invasion by suppressing nuclear factor-κB-dependent matrix metalloproteinase-9 expression
Authors: Ling, H.
Zhang, Y.
Ng, K.-Y. 
Chew, E.-H. 
Keywords: Breast cancer
Pachymic acid
Issue Date: Apr-2011
Citation: Ling, H., Zhang, Y., Ng, K.-Y., Chew, E.-H. (2011-04). Pachymic acid impairs breast cancer cell invasion by suppressing nuclear factor-κB-dependent matrix metalloproteinase-9 expression. Breast Cancer Research and Treatment 126 (3) : 609-620. ScholarBank@NUS Repository.
Abstract: Pachymic acid (PA), a lanostane-type triterpenoid derived from Poria cocos, possesses demonstrated anti-inflammatory and anti-cancer activities. Nonetheless, the biological properties and mechanism/s of action of PA remain largely undefined. In this study, the activity of PA against breast cancer cell invasion was evaluated. Invasiveness of human-derived MDA-MB-231 and MCF-7 breast carcinoma cells was suppressed by PA at non-lethal concentrations, which was associated with a decrease in matrix metalloproteinase-9 (MMP-9) secretion as a result of PA-mediated down-regulation of MMP-9 mRNA expression. In order to elucidate the underlying anti-invasive mechanism, the effect of PA on transcription factors activator protein-1 (AP-1) and nuclear factor kappaB (NF-κB) was examined using luciferase-based reporter gene assays. PA was found to bring about a reduction in phorbol 12-myristate 13-acetate (PMA)-induced transcriptional activity of NF-κB, but not that of AP-1. In accord with the luciferase activity data, western blot analysis showed that PA inhibited NF-κB signaling pathway, but did not alter the phosphorylation states of mitogen-activated protein kinases including ERK, JNK, and p38 kinase. The inhibition of PA on NF-κB signaling pathway was further attributed to PA-mediated diminution in PMA-induced degradation of inhibitor of kappaBα (IκBα) through preventing phosphorylation of the upstream signal IκB kinase (IKK). A decrease in p65 nuclear translocation was achieved, which led to attenuation of NF-κB transactivation. Taken together, it was concluded that by targeting NF-κB signaling, PA inhibited breast cancer cell invasion through decreasing MMP-9 expression. PA may thus be potentially exploited for use in tumor metastasis intervention. © Springer Science+Business Media, LLC. 2010.
Source Title: Breast Cancer Research and Treatment
ISSN: 01676806
DOI: 10.1007/s10549-010-0929-5
Appears in Collections:Staff Publications

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