Further Information:
We are interested in collaborating with research teams who are specialized in drug metabolism. In paritcular, we are interested to find out what metabolites of Rosiglitazone may be responsible for this drug's anticancer effect in vivo.
Loss of XIAP sensitizes rosiglitazone-induced growth inhibition of colon cancer in vivo.
International journal of cancer. Journal international du cancer 2008 Mar 19; In press
Dai Y Y, Qiao L L, Chan K KW, Zou B B, Ma J J, Lan H HY, Gu Q Q, Li Z Z, Wang Y Y, Wong B BL, Wong B BC
Department of Gastroenterology, Peking University First Hospital, Beijing, China.
Ligands for peroxisome proliferator-activated receptor gamma (PPARgamma) possess anticancer properties. However, the efficacy of PPARgamma ligands varies in different cancers. In colon cancer, the role of PPARgamma and its ligands is controversial. We recently showed that downregulation of X-linked inhibitor of apoptosis protein (XIAP) could sensitize colon cancer cells to troglitazone, and 15-deoxy-D12,14-prostaglandin J2 (15-PGJ2) induced cell killing. In our study, we aimed to examine whether rosiglitazone, another more clinically relevant PPARgamma ligand, has any synergistic anticancer effect with XIAP downregulation in colon cancer. Human colon cancer cell lines HCT116-XIAP(+/+) cells and HCT116-XIAP(-/-) cells were treated with various concentrations of rosiglitazone. The effects of rosiglitazone on cell proliferation, apoptosis and growth of xenograft colon cancers were studied. Rosiglitazone barely suppressed the growth and only very weakly induced apoptosis in HCT116 cells in vitro. Loss of XIAP did not sensitize HCT116 cells to rosiglitazone-induced growth inhibition or apoptosis. In vivo studies revealed that rosiglitazone strongly suppressed the growth of xenograft colon cancer, especially tumors derived from HCT116-XIAP(-/-) cells. The rosiglitazone-treated tumor had reduced expression of ki-67 and lowered mitotic rate. Downregulation of XIAP was associated with an impaired activation of PPARgamma by its ligand. Rosiglitazone induced marked upregulation of PTEN in HCT116-XIAP(-/-) cells, as well as in xenograft tumors derived from HCT116-XIAP(-/-) cells. We concluded that rosiglitazone significantly suppresses the growth of xenograft colon cancer, and downregulation of XIAP sensitizes the xenograft tumors to rosiglitazone-induced tumor suppression in vivo via upregulation of PTEN. (c) 2008 Wiley-Liss, Inc.
Keywords: XIAP PPARgamma rosiglitazone colorectal cancer apoptosis