In:
American Journal of Physiology-Endocrinology and Metabolism, American Physiological Society, Vol. 318, No. 5 ( 2020-05-01), p. E636-E645
Kurzfassung:
Protein deprivation has been shown to induce fatty liver in humans and animals, but the molecular mechanisms underlying such induction are largely unknown. Our previous studies have shown that a low-protein diet increases eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) protein and triglyceride (TG) levels in rat liver. 4E-BP1 is known to repress translation by binding to eIF4E. There is also evidence indicating that 4E-BP1 regulates lipid metabolism. Here, we examined the role of 4E-BP1 on TG accumulation in the livers of rats under protein deprivation. The low-protein diet rapidly increased the hepatic 4E-BP1 mRNA level within 1 day, followed by the induction of hepatic TG accumulation. The knockdown of hepatic 4E-BP1 attenuated the TG accumulation in rat liver induced by the low-protein diet. 4E-BP1 knockdown also increased the protein level of carnitine palmitoyltransferase 1A (CPT1A), a regulator of fatty acid oxidation, in the liver of rats fed a low-protein diet. These results indicate that a low-protein diet increases the amount of 4E-BP1, leading to TG accumulation in rat liver. We thus conclude that 4E-BP1 plays an important role in inducing hepatic steatosis under protein deprivation.
Materialart:
Online-Ressource
ISSN:
0193-1849
,
1522-1555
DOI:
10.1152/ajpendo.00464.2019
Sprache:
Englisch
Verlag:
American Physiological Society
Publikationsdatum:
2020
ZDB Id:
1477331-4
SSG:
12
Bookmarklink