Matrine inhibits proliferation and induces apoptosis of human colon cancer LoVo cells by inactivating Akt pathway
The present study has investigated the anti-tumor activity and the underlying mechanisms of matrine on human colon cancer LoVo cells. Matrine inhibited the proliferation of the cells in dose- and time-dependent manners. The concentration required for 50 % inhibition (IC50) was 1.15, 0.738, and 0.414 mg/ml, when cell were incubated with matrine for 24, 48, and 72 h, respectively. Matrine induced cell cycle arrest at G1 phase by downregulating cyclin D1 and upregulating p27 and p21. Matrine induced cell apoptosis by reducing the ratio of Bcl-2/Bax and increasing the activation of caspase-9 in a dose-dependent manner. Matrine displayed its anti-tumor activity by inactivating Akt, the upstream factor of the above proteins. Matrine significantly reduced the protein levels of pAkt, and increased the protein levels of other downstream factors, pBad and pGSK-3β. Specific inhibition of pAkt induced cell apoptosis, and synergized with matrine to inhibit the proliferation of LoVo cells; whereas activation of Akt neutralized the inhibitory effect of matrine on cell proliferation. The present study has demonstrated that matrine inhibits proliferation and induces apoptosis of human colon cancer LoVo cells by inactivating Akt pathway, indicating matrine may be a potential anti-cancer agent for colon cancer.
KeywordsMatrine LoVo cells Apoptosis Cell cycle Akt pathway
This work was supported by grants from the National Natural Scientific Foundation of China (30973474 and 81272467), and Postdoctoral Foundation of Heilongjiang Provincial Government (LRB09-404). Zhang S and Cheng B contributed equally to this work.
- 22.Zhang S, Qi J, Sun L, Cheng B, Pan S, Zhou M, Sun X (2009) Matrine induces programmed cell death and regulates expression of relevant genes based on PCR array analysis in C6 glioma cells. Mol Biol Rep 35:421–429Google Scholar
- 32.Ericson K, Gan C, Cheong I, Rago C, Samuels Y, Velculescu VE, Kinzler KW, Huso DL, Vogelstein B, Papadopoulos N (2010) Genetic inactivation of AKT1, AKT2, and PDPK1 in human colorectal cancer cells clarifies their roles in tumor growth regulation. Proc Natl Acad Sci USA 107:2598–2603PubMedCentralPubMedCrossRefGoogle Scholar
- 36.Li T, Wong VK, Yi XQ, Wong YF, Zhou H, Liu L (2010) Matrine induces cell anergy in human Jurkat T cells through modulation of mitogen-activated protein kinases and nuclear factor of activated T-cells signaling with concomitant up-regulation of anergy-associated genes expression. Biol Pharm Bull 33:40–46PubMedCrossRefGoogle Scholar