Cell Biology
The Role of SIRT6 Protein in Aging and Reprogramming of Human Induced Pluripotent Stem Cells*

https://doi.org/10.1074/jbc.M112.405928Get rights and content
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Aging is known to be the single most important risk factor for multiple diseases. Sirtuin 6, or SIRT6, has recently been identified as a critical regulator of transcription, genome stability, telomere integrity, DNA repair, and metabolic homeostasis. A knockout mouse model of SIRT6 has displayed dramatic phenotypes of accelerated aging. In keeping with its role in aging, we demonstrated that human dermal fibroblasts (HDFs) from older human subjects were more resistant to reprogramming by classic Yamanaka factors than those from younger human subjects, but the addition of SIRT6 during reprogramming improved such efficiency in older HDFs substantially. Despite the importance of SIRT6, little is known about the molecular mechanism of its regulation. We show, for the first, time posttranscriptional regulation of SIRT6 by miR-766 and inverse correlation in the expression of this microRNA in HDFs from different age groups. Our results suggest that SIRT6 regulates miR-766 transcription via a feedback regulatory loop, which has implications for the modulation of SIRT6 expression in reprogramming of aging cells.

Background:

Human dermal fibroblasts (HDFs) from older subjects are known to be more resistant to reprogramming.

Results:

Inclusion of SIRT6 can significantly improve the reprogramming efficiency.

Conclusion:

Changes in SIRT6 expression and its posttranscriptional regulation may be relevant in aging.

Significance:

MiR-766-mediated posttranscriptional regulation of SIRT6 has implications in human aging.

Aging
Embryonic Stem Cell
Gene Expression
Induced pluripotent Stem Cells
MicroRNA
Molecular Biology
Transcription Factors

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*

This work was supported, in whole or in part, by National Institutes of Health Grants DP2 OD004437, RC1 HL099117, R01 HL113006, P01 GM099130, UO1 HL099776, and CIRM RB3–05129 (to J. C. W.). This work was also supported by DFG (German Research Foundation) (to S. D.).

This article contains supplemental Figs. S1–S7, Video S1, Methods, and References.

1

Both authors contributed equally to this work.