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  • Title: Honokiol induces cell apoptosis in human chondrosarcoma cells through mitochondrial dysfunction and endoplasmic reticulum stress.
    Author: Chen YJ, Wu CL, Liu JF, Fong YC, Hsu SF, Li TM, Su YC, Liu SH, Tang CH.
    Journal: Cancer Lett; 2010 May 01; 291(1):20-30. PubMed ID: 19880244.
    Abstract:
    Chondrosarcoma is a malignant primary bone tumor that responds poorly to both chemotherapy and radiation therapy. In the present study, we investigated the anti-cancer effect of a honokiol, an active component isolated and purified from the Magnolia officinalis in human chondrosarcoma cells. Honokiol-induced cell apoptosis in human chondrosarcoma cell lines (including: JJ012 and SW1353) but not primary chondrocytes. Honokiol also induces upregulation of Bax and Bak, downregulation of Bcl-XL and dysfunction of mitochondria in chondrosarcoma cells. Honokiol triggered endoplasmic reticulum (ER) stress, as indicated by changes in cytosol-calcium levels. We also found that honokiol increased the expression and activities of glucose-regulated protein 78 (GRP78) and calpain. Transfection of cells with GRP78 or calpain siRNA reduced honokiol-mediated cell apoptosis in JJ012 cells. Importantly, animal studies have revealed a dramatic 53% reduction in tumor volume after 21days of treatment. This study demonstrates that honokiol may be a novel anti-cancer agent targeting chondrosarcoma cells.
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