Title |
Na,K-ATPase Isozymes in Colorectal Cancer and Liver Metastases
|
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Published in |
Frontiers in Physiology, January 2016
|
DOI | 10.3389/fphys.2016.00009 |
Pubmed ID | |
Authors |
Marc Baker Bechmann, Deborah Rotoli, Manuel Morales, María del Carmen Maeso, María del Pino García, Julio Ávila, Ali Mobasheri, Pablo Martín-Vasallo |
Abstract |
The goal of this study was to define Na,K-ATPase α and β subunit isoform expression and isozyme composition in colorectal cancer cells and liver metastases. The α1, α3, and β1 isoforms were the most highly expressed in tumor cells and metastases; in the plasma membrane of non-neoplastic cells and mainly in a cytoplasmic location in tumor cells. α1β1 and α3β1 isozymes found in tumor and metastatic cells exhibit the highest and lowest Na(+) affinity respectively and the highest K(+) affinity. Mesenchymal cell isozymes possess an intermediate Na(+) affinity and a low K(+) affinity. In cancer, these ions are likely to favor optimal conditions for the function of nuclear enzymes involved in mitosis, especially a high intra-nuclear K(+) concentration. A major and striking finding of this study was that in liver, metastasized CRC cells express the α3β1 isozyme. Thus, the α3β1 isozyme could potentially serve as a novel exploratory biomarker of CRC metastatic cells in liver. |
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