Abstract
The midbody is a singular organelle formed between daughter cells during cytokinesis and required for their final separation. Midbodies persist in cells long after division as midbody derivatives (MBds), but their fate is unclear. Here we show that MBds are inherited asymmetrically by the daughter cell with the older centrosome. They selectively accumulate in stem cells, induced pluripotent stem cells and potential cancer ‘stem cells’ in vivo and in vitro. MBd loss accompanies stem-cell differentiation, and involves autophagic degradation mediated by binding of the autophagic receptor NBR1 to the midbody protein CEP55. Differentiating cells and normal dividing cells do not accumulate MBds and possess high autophagic activity. Stem cells and cancer cells accumulate MBds by evading autophagosome encapsulation and exhibit low autophagic activity. MBd enrichment enhances reprogramming to induced pluripotent stem cells and increases the in vitro tumorigenicity of cancer cells. These results indicate unexpected roles for MBds in stem cells and cancer ‘stem cells’.
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Change history
15 November 2011
In the version of this article initially published online, the first sentence in the Acknowledgements section was incorrect. This error has been corrected in the HTML and PDF versions of the article.
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Acknowledgements
We thank E. Baehrecke for critical reading of the manuscript, T. Schlaeger and colleagues for assistance with H1-OGN and associated cell lines, the University of Massachusetts Medical School (UMMS) Flow Facility for assistance with MBd enrichment, P. Furcinitti of UMMS Digital Light Microscopy Core Facility for assistance with imaging, the UMMS DERC Morphology Core for assistance with immunohistochemitry, D. Guertin and C. Sparks for assistance with SMP preparation, S. Lyle and C. Powers for sample preparation and H-L. Liu for assistance with clone construction. We thank N. Mizushima for GFP–LC3-expressing Atg5−/− and matchedwild-type MEFs, M. Komatsu and T. Ishii for p 62−/− and matched wild-type MEFs, S. Jones for ex vivo C57BL/6 MEFs, B. Lewis for mouse hepatocellular cancer lines, S. Pino for in vitro activated T cells, W. Jiang for MKLP1–GFP plasmid, K. Khanna for CEP55–eGFP plasmid, J. Lippincott-Schwartz and G. Gaietta for plasmids for FPP assay, B. Levine (UT Southwestern) for Flag-tagged BECN1-expressing plasmid, A. Khodjakov for CETN1–GFP-expressing plasmids, K. Lee for hCenexin1 antibody and the Progeria Society for cell lines. The α6F antibody to Na/K-ATPase developed by D. M. Fambrough and the H4B4 antibody to LAMP2 developed by J.T. August and J. E. K. Hildreth were obtained from the Developmental Studies Hybridoma Bank developed under the auspices of the National Institute of Child Health and Human Development and maintained by The University of Iowa, Department of Biology. This work was supported by funding from the National Institutes of Health (GM051994 to S.D. and F32 GM084660-02 to D.B.), the W.M. Keck Foundation to S.D., the Ellison Foundation (AG-SS-1918-07) to S.D., the Department of Defense (W81XWH-08-1-0457 to S.D. and W81XWH-06-1-0140 to C-T.C.) and the Diabetes and Endocrine Resource Center (5P30DK3252025). Core resources supported by the Diabetes Endocrinology Research Center grant DK32520 were also used.
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C-T.C. and S.D. conceived the project and wrote the manuscript with the help of T-C.K. and D.B. The experiments on the inheritance and localization of MBds as well as some for MBd degradation were conducted by C-T.C. The experiments on MBd accumulation were conducted by C-T.C. with the help of T-C.K. and C.M.W. Investigation of the mechanisms for MBd degradation was conceived by T-C.K. and S.D., and much of the work executed by T-C.K. Autophagic flux assay, soft-agar assay of FACS-isolated cells and MBd localization in neural progenitors were conducted by D.B., who contributed substantially to the work and intellectual input on multiple aspects of this project. The reprogramming assay was conducted and analysed by T-C.K., T.T.O and S.L. The preparation of hESCs for live imaging was conducted by S.A. Tissue preparation was assisted by P.X. and J.M.H.
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Kuo, TC., Chen, CT., Baron, D. et al. Midbody accumulation through evasion of autophagy contributes to cellular reprogramming and tumorigenicity. Nat Cell Biol 13, 1214–1223 (2011). https://doi.org/10.1038/ncb2332
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DOI: https://doi.org/10.1038/ncb2332
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