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Medical Oncology

, 36:5 | Cite as

The c-MYC/NAMPT/SIRT1 feedback loop is activated in early classical and serrated route colorectal cancer and represents a therapeutic target

  • Lydia Brandl
  • Nina Kirstein
  • Jens Neumann
  • Andrea Sendelhofert
  • Michael Vieth
  • Thomas Kirchner
  • Antje MenssenEmail author
Original Paper
  • 202 Downloads

Abstract

We have recently identified a positive feedback loop in which c-MYC increases silent information regulator 1 (SIRT1) protein level and activity through transcriptional activation of nicotinamide phosphoribosyltransferase (NAMPT) and NAD+ increase. Here, we determined the relevance of the c-MYC–NAMPT–SIRT1 feedback loop, including the SIRT1 inhibitor deleted in breast cancer 1 (DBC1), for the development of conventional and serrated colorectal adenomas. Immunohistochemical analyses of 104 conventional adenomas with low- and high-grade dysplasia and of 157 serrated lesions revealed that elevated expression of c-MYC, NAMPT, and SIRT1 characterized all conventional and serrated adenomas, whereas DBC1 was not differentially regulated. Analyzing publicly available pharmacogenomic databases from 43 colorectal cancer cell lines demonstrated that responsiveness towards a NAMPT inhibitor was significantly associated with alterations in PTEN and TGFBR2, while features such as BRAF or RNF43 alterations, or microsatellite instability typical for serrated route colorectal cancer, showed increased sensitivities for inhibition of NAMPT and SIRT1. Our findings suggest an activation of the c-MYC–NAMPT–SIRT1 feedback loop that may crucially contribute to initiation and development of both routes to colorectal cancer. Targeting of NAMPT or SIRT1 may represent novel therapeutic strategies with putative higher sensitivity of the serrated route colorectal cancer subtype.

Keywords

c-MYC NAMPT SIRT1 Colorectal carcinogenesis Analysis of pharmacogenomics databases 

Notes

Acknowledgements

This study was supported by the German Research Foundation (Deutsche Forschungsgemeinschaft) Grant (# Me1719/3-1) (support to AM). We thank A. Heier for her expert support and experimental assistance.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Research involving human participants

Data and specimens were anonymized, and the need for consent was waived by the institutional ethics committee of the Medical Faculty of the Ludwig-Maximilians University.

Supplementary material

12032_2018_1225_MOESM1_ESM.pdf (1.8 mb)
Supplementary material 1 (PDF 1853 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of PathologyLudwig-Maximilians University (LMU)MunichGermany
  2. 2.Research group “Signaling pathways in colorectal cancer”, Department of Pathology, Ludwig-Maximilians University (LMU)MunichGermany
  3. 3.Department of PathologyKlinikum BayreuthBayreuthGermany
  4. 4.German Consortium for Translational Cancer Research (DKTK), DKTK site Munich, DKFZHeidelbergGermany

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