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- Title
BAX inhibitor-1 enhances cancer metastasis by altering glucose metabolism and activating the sodium-hydrogen exchanger: the alteration of mitochondrial function.
- Authors
Lee, G.-H.; Yan, C.; Shin, S.-J.; Hong, S.-C.; Ahn, T.; Moon, A.; Park, S. J.; Lee, Y. C.; Yoo, W. H.; Kim, H.-T.; Kim, D.-S.; Chae, S.-W.; Kim, H.-R.; Chae, H.-J.
- Abstract
The anti-apoptotic protein, BAX inhibitor-1 (BI-1), has a role in cancer/tumor progression. BI-1-overexpressing HT1080 and B16F10 cells produced higher lung weights and tumor volumes after injection into the tail veins of mice. Transfection of BI-1 siRNA into cells before injection blocked lung metastasis. in vitro, the overexpression of BI-1 increased cell mobility and invasiveness, with highly increased glucose consumption and cytosolic accumulation of lactate and pyruvate, but decreased mitochondrial O2 consumption and ATP production. Glucose metabolism-associated extracellular pH also decreased as cells excreted more H+, and sodium hydrogen exchanger (NHE) activity increased, probably as a homeostatic mechanism for intracellular pH. These alterations activated MMP 2/9 and cell mobility and invasiveness, which were reversed by the NHE inhibitor, 5-(N-ethyl-N-isopropyl) amiloride (EIPA), suggesting a role for NHE in cancer metastasis. In both in vitro and in vivo experiments, C-terminal deleted (CΔBI-1) cells showed similar results to control cells, suggesting that the C-terminal motif is required for BI-1-associated alterations of glucose metabolism, NHE activation and cancer metastasis. These findings strongly suggest that BI-1 reduces extracellular pH and regulates metastasis by altering glucose metabolism and activating NHE, with the C-terminal tail having a pivotal role in these processes.
- Subjects
METASTASIS; CANCER invasiveness; CELLULAR mechanics; MONOSACCHARIDES; PATHOLOGY
- Publication
Oncogene, 2010, Vol 29, Issue 14, p2130
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/onc.2009.491