Abstract
Background
Raf-1 kinase inhibitor protein (RKIP) inhibits Raf (a key element in the ERK/MAPK pathway) and is regarded as anti-tumoral. In contrast, 14-3-3 is considered protumoral. However, the pathogenetic role of RKIP and 14-3-3ε in gastric cancer is unclear.
Aim
The purpose of this study was to examine the influence of 14-3-3ε and RKIP on SGC7901, the regulation of the ERK/MAKP pathway by both, and the interaction between the two proteins.
Methods
RKIP and 14-3-3ε genes were introduced into SGC7901 cells using gene cloning technique, then, the bioactivities including the proliferation, migration and invasion of the cells were assessed by MTT and migration assays. ERK/MAKP pathway’s activity was examined using real-time quantitative RT–PCR, western blot, immunoprecipitation and 3D-immunolocalization techniques.
Results
Our results showed that RKIP inhibited SGC7901 cells’ bioactivities whereas 14-3-3ε upregulated them through the involvement of the ERK/MAPK pathway. RKIP inactivated this pathway, but 14-3-3ε activated it. RKIP and 14-3-3ε were co-localized in the cells and interacted with each other; this attributed to their opposite influence on the ERK/MAPK pathway and the cells bioactivities.
Conclusions
The ERK/MAPK pathway is involved in the pathogenesis of gastric cancer; RKIP and 14-3-3ε exert an opposite effect on this pathway and the cells possibly via both direct and indirect reactions with the elements in this pathway. The interaction between RKIP and 14-3-3ε may also contribute to their pathogenetic roles in gastric cancer.
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (No. 81072038).
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No conflicts of interest of any kind exit in the submission of this manuscript.
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Yan, L., Gu, H., Li, J. et al. RKIP and 14-3-3ε Exert an Opposite Effect on Human Gastric Cancer Cells SGC7901 by Regulating the ERK/MAPK Pathway Differently. Dig Dis Sci 58, 389–396 (2013). https://doi.org/10.1007/s10620-012-2341-y
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DOI: https://doi.org/10.1007/s10620-012-2341-y