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Assessing Energy Substrate Oxidation In Vitro with 14CO2 Trapping

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E2F transcription factor-1 regulates oxidative metabolism.

Emilie Blanchet^1,2, Jean-Sébastien Annicotte^1,2, Sylviane Lagarrigue^1,2

¹IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France; INSERM, U896, Montpellier, F-34298, France; Université de Montpellier1, Montpellier, F-34298, France; CRLC Val d'Aurelle Paul Lamarque, Montpellier, F-34298, France.

Nature Cell Biology

|August 16, 2011

Summary

The E2F1 transcription factor acts as a metabolic switch, repressing oxidative metabolism genes in basal conditions. Loss of E2F1 in mice leads to increased oxidative metabolism, highlighting its role in cellular stress response.

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Area of Science:

Cellular Metabolism
Molecular Biology
Transcriptional Regulation

Background:

Cells coordinate proliferative and metabolic pathways in response to stress.
E2F transcription factors regulate genes involved in cell proliferation and metabolism.
E2F1 influences glucose-stimulated insulin secretion and obesity resistance.

Purpose of the Study:

To investigate the role of E2F1 as a regulatory switch between cell proliferation and metabolism.
To elucidate how E2F1 coordinates cellular responses to stress.

Main Methods:

Analysis of gene expression in basal and stressed conditions.
Utilizing E2F1 knockout (E2f1(-/-)) mice and a constitutively active CDK4 (CDK4(R24C)) mouse model.
Investigating the association between E2F1 and pRB in gene repression.

Main Results:

E2F1 represses key genes for energy homeostasis and mitochondrial function in muscle and brown adipose tissue under basal conditions.
E2f1(-/-) mice exhibit a pronounced oxidative metabolic phenotype.
E2F1-pRB association is crucial for repressing oxidative metabolism genes, and this repression is relieved under conditions of high energy demand or altered CDK4 activity.

Conclusions:

E2F1 functions as a critical metabolic switch, shifting cells from oxidative to glycolytic metabolism in response to stress.
E2F1's regulation of oxidative metabolism is essential for maintaining energy homeostasis and adapting to cellular stress.