Specific activation of the integrated stress response uncovers regulation of central carbon metabolism and lipid droplet biogenesis, 2024, Labbé et al

Specific activation of the integrated stress response uncovers regulation of central carbon metabolism and lipid droplet biogenesis
Labbé, Katherine; LeBon, Lauren; King, Bryan; Vu, Ngoc; Stoops, Emily H.; Ly, Nina; Lefebvre, Austin E. Y. T.; Seitzer, Phillip; Krishnan, Swathi; Heo, Jin-Mi; Bennett, Bryson; Sidrauski, Carmela

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 accumulation of lipid droplets. While DGAT1 is the main driver of lipid droplet biogenesis, DGAT2 plays an essential role in buffering stress and maintaining cell survival.

Together, we demonstrate the sufficiency of the ISR in promoting a previously unappreciated metabolic state.

Link | PDF (Nature Communications) [Open Access]

 

This is galactic way over my head, but it "feels" very important. An alarm bell that can't or won't switch off in ME/CFS?
I hope the better equipped and better working minds can understand this paper in relation to ME/CFS. Please HELP!

 

With metabolic pathways such as this, I always wonder if T2 (3-5 diiodothyronine) is involved, since I had temporary remissions from that. I agree that ME may involve one of these obscure mechanisms as part of a feedback loop that can get locked into an abnormal state.