Mitochondrial YBX1 promotes cancer cell metastasis by inhibiting pyruvate uptake

Abstract

Pyruvate is an essential fuel for maintaining the tricarboxylic acid (TCA) cycle in the mitochondria. However, the precise molecular mechanism of pyruvate uptake by mitochondrial pyruvate carrier (MPC) is largely unknown. Here, we report that the DNA/RNA-binding protein Y-box binding protein 1 (YBX1) is localized to the mitochondrial inter-membrane space by its C-terminal domain (CTD) in cancer cells. In mitochondria, YBX1 inhibits pyruvate uptake by associating with MPC1/2, thereby suppressing pyruvate-dependent TCA cycle flux. This association, in turn, promotes MPC-mediated glutaminolysis and histone lactylation. Our findings reveal that the YBX1-MPC axis exhibits a positive correlation with metastatic potential, while does not affect cell proliferation in both cultured cells and tumor xenografts. Therefore, the restricted pyruvate uptake into mitochondria potentially represents a hallmark of metastatic capacity, suggesting that the YBX1-MPC axis is a therapeutic target for combating cancer metastasis.

Key words： mitochondria; YBX1; pyruvate metabolism; MPC1/2; metastasis

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