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      • Akt3 knockdown induces mitochondrial dysfunction in human cancer cells

        Kim, Minjee,Kim, Young Yeon,Jee, Hye Jin,Bae, Sun Sik,Jeong, Na Young,Um, Jee-Hyun,Yun, Jeanho Oxford University Press 2016 Acta biochimica et biophysica Sinica Vol.48 No.5

        <P>Akt/PKB plays a pivotal role in cell proliferation and survival. However, the isotype-specific roles of Akt in mitochondrial function have not been fully addressed. In this study, we explored the role of Akt in mitochondrial function after stable knockdown of the Akt isoforms in EJ human bladder cancer cells. We found that the mitochondrial mass was significantly increased in the Akt1-and Akt3-knockdown cells, and this increase was accompanied by an increase in TFAM and NRF1. Akt2 knockdown did not cause a similar effect. Interestingly, Akt3 knockdown also led to severe structural defects in the mitochondria, an increase in doxorubicin-induced senescence, and impairment of cell proliferation in galactose medium. Consistent with these observations, the mitochondrial oxygen consumption rate was significantly reduced in the Akt3-knockdown cells. An Akt3 deficiency-induced decrease in mitochondrial respiration was also observed in A549 lung cancer cells. Collectively, these results suggest that the Akt isoforms play distinct roles in mitochondrial function and that Akt3 is critical for proper mitochondrial respiration in human cancer cells.</P>

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