Loss of SLC25A11 causes suppression of NSCLC and melanoma tumor formation.
BACKGROUND
Fast growing cancer cells require greater amounts of ATP than normal cells. Although glycolysis was suggested as a source of anabolic metabolism based on lactate production, the main source of ATP to support cancer cell metabolism remains unidentified.


METHODS
We have proposed that the oxoglutarate carrier SLC25A11 is important for ATP production in cancer by NADH transportation from the cytosol to mitochondria as a malate. We have examined not only changes of ATP and NADH but also changes of metabolites after SLC25A11 knock down in cancer cells.


FINDINGS
The mitochondrial electron transport chain was functionally active in cancer cells. The cytosolic to mitochondrial NADH ratio was higher in non-small cell lung cancer (NSCLC) and melanoma cells than in normal cells. This was consistent with higher levels of the oxoglutarate carrier SLC25A11. Blocking malate transport by knockdown of SLC25A11 significantly impaired ATP production and inhibited the growth of cancer cells, which was not observed in normal cells. In in vivo experiments, heterozygote of SLC25A11 knock out mice suppressed KRASLA2 lung tumor formation by cross breeding.


INTERPRETATION
Cancer cells critically depended on the oxoglutarate carrier SLC25A11 for transporting NADH from cytosol to mitochondria as a malate form for the purpose of ATP production. Therefore blocking SLC25A11 may have an advantage in stopping cancer growth by reducing ATP production. FUND: The Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science and ICT to SYK (NRF-2017R1A2B2003428).
['Lee|Jae-Seon|JS|', 'Lee|Ho|H|', 'Lee|Soohyun|S|', 'Kang|Joon Hee|JH|', 'Lee|Seon-Hyeong|SH|', 'Kim|Seul-Gi|SG|', 'Cho|Eunae Sandra|ES|', 'Kim|Nam Hee|NH|', 'Yook|Jong In|JI|', 'Kim|Soo-Youl|SY|']
D000255:Adenosine Triphosphate D000595:Amino Acid Sequence D000818:Animals D001483:Base Sequence D002289:Carcinoma, Non-Small-Cell Lung D045744:Cell Line, Tumor D049109:Cell Proliferation D002471:Cell Transformation, Neoplastic D004195:Disease Models, Animal D055785:Gene Knockdown Techniques D011905:Genes, ras D064593:Heterografts D006801:Humans D008175:Lung Neoplasms D008545:Melanoma D053078:Membrane Potential, Mitochondrial D026901:Membrane Transport Proteins D051379:Mice D018345:Mice, Knockout D008928:Mitochondria D008954:Models, Biological D009154:Mutation D021381:Protein Transport
SLC25A11 Oxoglutarate carrier Cancer metabolism Cancer therapeutic target Malate aspartate shuttle