The Myc-Like Mlx Network Impacts Aging and Metabolism
Wang, H.; Stevens, T.; Lu, J.; Roberts, A.; Land, C.; muzumdar, r.; gong, z.; Vockley, J.; Prochownik, E. V.
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The "Mlx" and "Myc" Networks share many common gene targets. Just as Mycs activity depends upon its heterodimerization with Max, the Mlx Network requires that the Max-like factor Mlx associate with the Myc-like factors MondoA or ChREBP. We show here that body-wide Mlx inactivation, like that of Myc, accelerates numerous aging-related phenotypes pertaining to body habitus and metabolism. The deregulation of numerous aging-related Myc target gene sets is also accelerated. Among other functions, these gene sets often regulate ribosomal and mitochondrial structure and function, genomic stability and aging. Whereas "MycKO" mice have an extended lifespan because of a lower cancer incidence, "MlxKO" mice have normal lifespans and a somewhat higher cancer incidence. Like Myc, Mlx, MondoA and ChREBP expression and that of their target genes, deteriorate with age in both mice and humans, underscoring the importance of life-long and balanced cross-talk between the two Networks to maintain normal aging. TeaserInactivation of the Myc-like "Mlx Network" in mice leads to phenotypic and molecular signs of premature aging and a cancer predisposition.
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