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Abstract Title:

Honokiol inhibits in vitro and in vivo growth of oral squamous cell carcinoma through induction of apoptosis, cell cycle arrest and autophagy.

Abstract Source:

J Cell Mol Med. 2018 Mar ;22(3):1894-1908. Epub 2018 Jan 24. PMID: 29363886

Abstract Author(s):

Kao-Jean Huang, Chin-Ho Kuo, Shu-Hsin Chen, Ching-Yen Lin, Ying-Ray Lee

Article Affiliation:

Kao-Jean Huang

Abstract:

Honokiol, an active natural product derived from Magnolia officinalis, exerted anticancer effects through a variety of mechanisms on multiple types of cancers. In this study, the molecular mechanisms of honokiol in suppressing the human oral squamous cell carcinoma (OSCC) cells were evaluated. Treatment of two OSCC cell lines with honokiol resulted in reducing the cell proliferation and arresting the cell cycle at G1 stage which was correlated with the down-regulation of Cdk2 and Cdk4 and the up-regulation of cell cycle suppressors, p21 and p27. In addition, the caspase-dependent programmed cell death was substantially detected, and the autophagy was induced as the autophagosome formation and autophagic flux proceeded. Modulation of autophagy by autophagic inducer, rapamycin or inhibitors, 3-MA or bafilomycin, potentiated the honokiol-mediated anti-OSCC effects where honokiol exerted multiple actions in suppression of MAPK pathway and regulation of Akt/mTOR or AMPK pathways. As compared to clinical therapeutic agent, 5-FU, honokiol exhibited more potent activity against OSCC cells and synergistically enhanced the cytotoxic effect of 5-FU. Furthermore, orally administrated honokiol exerted effective antitumour activity in vivo in OSCC-xenografted mice. Thus, this study revealed that honokiol could be a promising candidate in preventing human OSCCs.

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Sayer Ji
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