Specific activation of the integrated stress response uncovers regulation of central carbon metabolism and lipid droplet biogenesis.

ABSTRACT: The integrated stress response (ISR) enables cells to cope with a variety of insults, but its specific contribution to downstream cellular outputs remains unclear. Using a synthetic tool, we selectively activate the ISR without co-activation of parallel pathways and define the resulting cellular state with multi-omics profiling. We identify time- and dose-dependent gene expression modules, with ATF4 driving only a small but sensitive subgroup that includes amino acid metabolic enzymes. This ATF4 response affects cellular bioenergetics, rerouting carbon utilization towards amino acid production and away from the tricarboxylic acid cycle and fatty acid synthesis. We also find an ATF4-independent reorganization of the lipidome that promotes DGAT-dependent triglyceride synthesis and accumulati

SUBMITTER: Labbe K 

PROVIDER: S-EPMC11436933 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature