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  • Deficiency in mTORC1-controlled C/EBPβ-mRNA translation improves metabolic health in mice.

Deficiency in mTORC1-controlled C/EBPβ-mRNA translation improves metabolic health in mice.

EMBO reports (2015-06-27)
Laura M Zidek, Tobias Ackermann, Götz Hartleben, Sabrina Eichwald, Gertrud Kortman, Michael Kiehntopf, Achim Leutz, Nahum Sonenberg, Zhao-Qi Wang, Julia von Maltzahn, Christine Müller, Cornelis F Calkhoven
ABSTRACT

The mammalian target of rapamycin complex 1 (mTORC1) is a central regulator of physiological adaptations in response to changes in nutrient supply. Major downstream targets of mTORC1 signalling are the mRNA translation regulators p70 ribosomal protein S6 kinase 1 (S6K1p70) and the 4E-binding proteins (4E-BPs). However, little is known about vertebrate mRNAs that are specifically controlled by mTORC1 signalling and are engaged in regulating mTORC1-associated physiology. Here, we show that translation of the CCAAT/enhancer binding protein beta (C/EBPβ) mRNA into the C/EBPβ-LIP isoform is suppressed in response to mTORC1 inhibition either through pharmacological treatment or through calorie restriction. Our data indicate that the function of 4E-BPs is required for suppression of LIP. Intriguingly, mice lacking the cis-regulatory upstream open reading frame (uORF) in the C/EBPβ-mRNA, which is required for mTORC1-stimulated translation into C/EBPβ-LIP, display an improved metabolic phenotype with features also found under calorie restriction. Thus, our data suggest that translational adjustment of C/EBPβ-isoform expression is one of the key processes that direct metabolic adaptation in response to changes in mTORC1 activity.

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