Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

B-Raf inhibitors induce epithelial differentiation in BRAF mutant colorectal cancer cells

ABSTRACT: Mutations in the BRAF proto-oncogene, which encodes the B-Raf kinase, are associated with more aggressive, less-differentiated and therapy-resistant colorectal cancers (CRC). However, the molecular mechanisms responsible for these correlations remain unknown. Here, we report the characterization of human isogenic CRC cell line models (Caco-2, HT29, Colo-205) in which we modulate the expression of the B-RafV600E oncoprotein either by conditional cDNA or shRNA expression. Using these models in conventional and three dimensional tissue culture systems, we demonstrate that genetic depletion of endogenous B-RafV600E decreases cellular motility and invasion, while it induces hallmarks of differentiated epithelia such as the formation of functional adherens and tight junctions. Importantly, these effects are recapitulated by exposing these lines to B-Raf (PLX4720, vemurafenib, dabrafenib) or MEK inhibitors (trametinib). Furthermore, loss of endogenous B-RafV600E in HT29 xenografts does not only stall tumor growth, but also induces epithelial structures with marked expression of Cdx-2, a prognostic marker and master regulator of intestinal morphogenesis. By performing the first transcriptome profiles of B-Raf inhibitor treated 3D cultures of a primary adenocarcinoma and a metastasis derived CRC cell line, we establish functional links between B-RafV600E and proteins of known and potentially new prognostic relevance. We propose that B-Raf/MEK/ERK pathway inhibitors could be used to induce CRC differentiation and thereby to limit metastatic disease. To measure the time resolved gene responses, RNA was isolated from PLX4720 or DMSO treated Colo-205 and HT29 3D culture cell lysates at days 1,3 and 10 and days 1,3, and 8, respectively. The time points for HT29 cells were taken in biological duplicates.

ORGANISM(S): Homo sapiens

SUBMITTER: Hauke Busch

PROVIDER: E-GEOD-50791 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

B-Raf inhibitors induce epithelial differentiation in BRAF-mutant colorectal cancer cells.

Herr Ricarda R Köhler Martin M Andrlová Hana H Weinberg Florian F Möller Yvonne Y Halbach Sebastian S Lutz Lisa L Mastroianni Justin J Klose Martin M Bittermann Nicola N Kowar Silke S Zeiser Robert R Olayioye Monilola A MA Lassmann Silke S Busch Hauke H Boerries Melanie M Brummer Tilman T

Cancer research 20141107 1

BRAF mutations are associated with aggressive, less-differentiated and therapy-resistant colorectal carcinoma. However, the underlying mechanisms for these correlations remain unknown. To understand how oncogenic B-Raf contributes to carcinogenesis, in particular to aspects other than cellular proliferation and survival, we generated three isogenic human colorectal carcinoma cell line models in which we can dynamically modulate the expression of the B-Raf(V600E) oncoprotein. Doxycyclin-inducible ...[more]

PMID: 25381152

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Dataset Information

B-Raf inhibitors induce epithelial differentiation in BRAF mutant colorectal cancer cells

Publications

B-Raf inhibitors induce epithelial differentiation in BRAF-mutant colorectal cancer cells.

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