Dominant negative MEKK1 inhibits survival of pancreatic cancer cells

50Citations
Citations of this article
41Readers
Mendeley users who have this article in their library.
Get full text

Abstract

Human pancreatic cancers harbor mutations in the K-ras gene, and these mutations convert the gene oncogenic and constitutively active forms. However, in pancreatic cancer cells little is known about the activation of the downstream pathways of Ras, MEK-ERK and MEKK1-JNK, and their roles in cell survival and proliferation. An analysis of nine pancreatic cancer tissues revealed JNK activation in all tumor samples and ERK activation in three tumor samples. Colony formation assays by transfection of dominant negative mutants of Ras, ERK or MEKK1 into pancreatic cancer cell lines (BxPC-3, PANC-1, MIAPa-Ca-2 and AsPC-1) and an amnion-derived cell line (FL) revealed that DN-MEKK strongly inhibits the survival of colonies in pancreatic cancer cells, but not in FL cells. In vitro kinase assays and luciferase assays using the Ga14c-Jun system revealed that in pancreatic cancer cells DN-MEKK fails to inhibit JNK activation. In PANC-1 cells, c-Jun was found to be a major component of protein component binding to AP-1 site and CRE, but not in FL cells. The inhibitory effect of DN-MEKK in PANC-1 cells was thought to be the result of the inhibition of c-Jun DNA-binding. The difference of suppression in pancreatic cancer cells and non-pancreatic cancer cells suggested that the MEKK1 pathway mainly contributes to cell survival in pancreatic cancer cells and may provide an advantage for the gene therapy of pancreatic cancers using DN-MEKK expression vectors.

Author supplied keywords

Cite

CITATION STYLE

APA

Hirano, T., Shino, Y., Saito, T., Komoda, F., Okutomi, Y., Takeda, A., … Shirasawa, H. (2002). Dominant negative MEKK1 inhibits survival of pancreatic cancer cells. Oncogene, 21(38), 5923–5928. https://doi.org/10.1038/sj.onc.1205643

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free