Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 48, Issue 3, Pages 511-517Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2011.01.014
Keywords
Phellinus linteus; Proteoglycan; Reg IV; EGFR; PIgR; Akt
Funding
- Science and Technology Department of Zhejiang Province [2008C22034]
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Proteoglycan (P1) purified from Phellinus linteus has been reported to have anti-disease activities. The objectives of our research were to determine the anti-tumor effect and possible mechanisms of P1 on human cancer cells. Cell inhibition assay showed that P1 has an antiproliferative effect on HepG2, HT-29, NCI-H 460 and MCF-7 human colon cancer cells, especially it was very effective in inhibiting HT-29 cells. When HT-29-bearing mice were treated with P1(100 mg/kg), there was relative increase in spleen and thymus weights, the plasmatic pIgR and IgA levels were significantly increased, also there was a notable decrease in plasmatic PGE2, Reg IV, EGFR and Akt concentrations measured by ELISA. RT-PCR analysis suggested that P1-induced HT-29 apoptosis appeared to be associated with a decrease in the levels of expression of Reg IV and EGFR. These results suggest that P1 might have two potential roles in treating cancer; it acts as an immunopotentiator partly through protecting T cells from escaping PGE2 attack and enhancing the mucosal IgA response, and as a direct inhibitor by disrupting the Reg IV/EGFR/Akt signaling pathway. (C) 2011 Elsevier B.V. All rights reserved.
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