Inhibition of Sirt6 suppresses tumor growth by inducing G1/S phase arrest in renal cancer cells.

: Sirt6 is a vital member of the Sirtuin family that plays a key role in cellular apoptosis, aging, DNA damage repair, telomere homeostasis and integrity, energy metabolism, glucose homeostasis, and gene regulation. In recent studies, Sirt6 is down-regulated in several cancers and predicted to be a tumor suppressor, but as a tumor oncogene in other cancers. In this study, we explored the specific role of Sirt6 in human renal cell carcinoma (RCC). We found that Sirt6 was up-expressed in renal tumor tissues and cells. Sirt6 silence in RCC led to G1/S phase arrest, a rise in apoptosis and a decrease in cell viability, as well as an enhancement of chemotherapeutic sensitivity. In conclusion, these findings suggest that Sirt6 acted as an oncogene in human RCC and it could be a potential target for RCC treatment.