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Premature Aging and Reduced Cancer Incidence Associated with Body-Wide Loss of Myc

Wang, H.; Lu, J.; Stevens, T.; Roberts, A.; Mandel, J.; Avula, R.; Wu, Y.; Wang, J.; Finkel, T.; Vant Land, C.; Vockley, J. E.; Airik, M.; Airik, R.; Muzumdar, R.; Gong, Z.; Torbenson, M. S.; Prochownik, E. V.

2023-02-02 cancer biology
10.1101/2023.01.30.526354 bioRxiv
Show abstract

MYC proto-oncogene dysregulation alters metabolism, translation and other functions in ways that support tumor induction and maintenance. Although Myc+/- mice are healthier and longer-lived than control mice, the long-term ramifications of more complete Myc loss remain unknown. We now describe the chronic consequences of body-wide Myc inactivation initiated postnatally. "MycKO" mice acquire numerous features of premature aging including altered body composition and habitus, metabolic dysfunction, hepatic steatosis and the dysregulation of numerous gene sets involved in functions that normally deteriorate with aging. Yet, MycKO mice have extended life spans that correlate with a 3-4-fold lower lifetime cancer incidence. Aging tissues from normal mice and humans also down-regulate Myc and gradually deregulate many of the same Myc target gene sets that are dysregulated in MycKO mice. Normal aging and its associated cancer predisposition are thus highly linked via Myc and its target genes and can be genetically separated.

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