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Abstract Title:

Phellinus linteus sensitises apoptosis induced by doxorubicin in prostate cancer.

Abstract Source:

Br J Cancer. 2006 Aug 7;95(3):282-8. Epub 2006 Jul 25. PMID: 16868541

Abstract Author(s):

L Collins, T Zhu, J Guo, Z J Xiao, C-Y Chen

Article Affiliation:

Department of Pathology, K522, Boston University School of Medicine, 80 East Concord Street, Boston, MA 02118, USA.

Abstract:

It has been demonstrated that the Phellinus linteus (PL) mushroom, which mainly consists of polysaccharides, possesses antitumour activity. The mechanisms of PL against malignant growth remain unknown. The anticancer drug doxorubicin (Dox) has been shown to induce apoptosis via initiating a caspase cascade. In this investigation, we tested the effect of PL on Dox-induced apoptosis in prostate cancer LNCaP cells. We showed that PL or Dox, at relatively low doses, does not induce apoptosis in the cells. However, combination treatment with low doses of PL and Dox results in a synergistic effect on the induction of apoptosis. In this apoptotic process, caspases 8, 3 and BID are cleaved, and the addition of caspase inhibitor z-VADfmk completely blocks apoptosis. In addition, JNK is activated in response to PL or the combination treatment in LNCaP cells. The suppression of JNK partially inhibits the induction of apoptosis elicited by the co-treatment. These findings indicate that PL has a synergistic effect with Dox to activate caspases in prostate cancer LNCaP cells. Our study also suggests that PL has therapeutic potential to augment the magnitude of apoptosis induced by antiprostate cancer drugs.

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Sayer Ji
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