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Proc Natl Acad Sci U S A. 2011 Oct 4;108(40):16663-8. doi: 10.1073/pnas.1106123108. Epub 2011 Sep 19.

CD147 subunit of lactate/H+ symporters MCT1 and hypoxia-inducible MCT4 is critical for energetics and growth of glycolytic tumors.

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  • 1Institute of Developmental Biology and Cancer, Centre National de la Recherche Scientifique Unité Mixte de Recherche 6543, University of Nice, 06189 Nice, France.

Erratum in

  • Proc Natl Acad Sci U S A. 2012 Dec 4;109(49):20166. Naïken, Tanesha [corrected to Naiken, Tanesha]; Ilk, Karine [corrected to Ilc, Karine].

Abstract

Malignant tumors exhibit increased dependence on glycolysis, resulting in abundant export of lactic acid, a hypothesized key step in tumorigenesis. Lactic acid is mainly transported by two H(+)/lactate symporters, MCT1/MCT4, that require the ancillary protein CD147/Basigin for their functionality. First, we showed that blocking MCT1/2 in Ras-transformed fibroblasts with AR-C155858 suppressed lactate export, glycolysis, and tumor growth, whereas ectopic expression of MCT4 in these cells conferred resistance to MCT1/2 inhibition and reestablished tumorigenicty. A mutant-derivative, deficient in respiration (res(-)) and exclusively relying on glycolysis for energy, displayed low tumorigenicity. These res(-) cells could develop resistance to MCT1/2 inhibition and became highly tumorigenic by reactivating their endogenous mct4 gene, highlighting that MCT4, the hypoxia-inducible and tumor-associated lactate/H(+) symporter, drives tumorigenicity. Second, in the human colon adenocarcinoma cell line (LS174T), we showed that combined silencing of MCT1/MCT4 via inducible shRNA, or silencing of CD147/Basigin alone, significantly reduced glycolytic flux and tumor growth. However, both silencing approaches, which reduced tumor growth, displayed a low level of CD147/Basigin, a multifunctional protumoral protein. To gain insight into CD147/Basigin function, we designed experiments, via zinc finger nuclease-mediated mct4 and basigin knockouts, to uncouple MCTs from Basigin expression. Inhibition of MCT1 in MCT4-null, Basigin(high) cells suppressed tumor growth. Conversely, in Basigin-null cells, in which MCT activity had been maintained, tumorigenicity was not affected. Collectively, these findings highlight that the major protumoral action of CD147/Basigin is to control the energetics of glycolytic tumors via MCT1/MCT4 activity and that blocking lactic acid export provides an efficient anticancer strategy.

PMID:
21930917
[PubMed - indexed for MEDLINE]
PMCID:
PMC3189052
Free PMC Article

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