Medicine and Health Sciences Commons^™

Intra-Tumoral Heterogeneity In Metastatic Potential And Survival Signaling Between Iso-Clonal Hct116 And Hct116b Human Colon Carcinoma Cell Lines., Sanjib Chowdhury, Melanie Ongchin, Elizabeth Sharratt, Ivan Dominguez, J. Wang, Michael G. Brattain, Ashwani Rajput

Journal Articles: Eppley Institute

BACKGROUND: Colorectal cancer (CRC) metastasis is a leading cause of cancer-related deaths in the United States. The molecular mechanisms underlying this complex, multi-step pathway are yet to be completely elucidated. Recent reports have stressed the importance of intra-tumoral heterogeneity in the development of a metastatic phenotype. The purpose of this study was to characterize the intra-tumoral phenotypic heterogeneity between two iso-clonal human colon cancer sublines HCT116 and HCT116b on their ability to undergo metastatic colonization and survive under growth factor deprivation stress (GFDS).

MATERIALS AND METHODS: HCT116 and HCT116b cells were transfected with green fluorescence protein and subcutaneously injected into …

Tgf-Beta Suppresses Vegfa-Mediated Angiogenesis In Colon Cancer Metastasis., Liying Geng, Anathbandhu Chaudhuri, G. Talmon, James L. Wisecarver, J. Wang

Journal Articles: Eppley Institute

The FET cell line, derived from an early stage colon carcinoma, is non-tumorigenic in athymic nude mice. Engineered FET cells that express TGF-α (FETα) display constitutively active EGFR/ErbB signaling. These cells readily formed xenograft tumors in athymic nude mice. Importantly, FETα cells retained their response to TGF-beta-mediated growth inhibition, and, like the parental FET cells, expression of a dominant negative TGF-beta type II receptor (DNRII) in FETα cells (FETα/DNRII) abrogated responsiveness to TGF-beta-induced growth inhibition and apoptosis under stress conditions in vitro and increased metastatic potential in an orthotopic model in vivo, which indicates metastasis suppressor activity of TGF-beta signaling …