6533b856fe1ef96bd12b32de
RESEARCH PRODUCT
Dietary protein restriction reduces circulating VLDL triglyceride levels via CREBH-APOA5-dependent and -independent mechanisms
Beatrice BertozziEylul HarputlugilNicola VeroneseAlexander BarteltJoeerg HeerenValeria TostiSusan S. BirdRose M. GathunguRose M. GathunguKaspar TrochaPedro MejiaAlban LongchampMichael R MacarthurAlessandro ArduiniBruce S. KristalJ. Humberto Treviño-villarrealC. Keith OzakiP. Kent LangstonAndrew ThompsonJames R. MitchellLear E. BraceRobert S. FigenshauJustin S. ReynoldsGerald L. AndrioleLuigi FontanaLuigi FontanaLuigi FontanaGustavo Satoru KajitaniArnold Bullocksubject
0301 basic medicineMalemedicine.medical_specialtyVery low-density lipoproteinDietary proteinFGF21Calorie restrictionmTORC1Lipoproteins VLDLMechanistic Target of Rapamycin Complex 1Protein Serine-Threonine Kinases03 medical and health sciencesMice0302 clinical medicineRisk FactorsInternal medicinemedicineDiet Protein-RestrictedIntegrated stress responseAnimalsHumansCyclic AMP Response Element-Binding ProteinTriglyceridesRandomized Controlled Trials as TopicHypertriglyceridemiaChemistryHydrolysisHypertriglyceridemianutritional and metabolic diseasesGeneral Medicinemedicine.diseaseLipid Metabolism030104 developmental biologyEndocrinologyApolipoproteinsHypotriglyceridemiaLiverApolipoprotein A-Vlipids (amino acids peptides and proteins)Female030217 neurology & neurosurgeryLipoproteinResearch Articledescription
Hypertriglyceridemia is an independent risk factor for cardiovascular disease. Dietary interventions based on protein restriction (PR) reduce circulating triglycerides (TGs), but underlying mechanisms and clinical relevance remain unclear. Here, we show that 1 week of a protein-free diet without enforced calorie restriction significantly lowered circulating TGs in both lean and diet-induced obese mice. Mechanistically, the TG-lowering effect of PR was due, in part, to changes in very low-density lipoprotein (VLDL) metabolism both in liver and peripheral tissues. In the periphery, PR stimulated VLDL-TG consumption by increasing VLDL-bound APOA5 expression and promoting VLDL-TG hydrolysis and clearance from circulation. The PR-mediated increase in Apoa5 expression was controlled by the transcription factor CREBH, which coordinately regulated hepatic expression of fatty acid oxidation-related genes, including Fgf21 and Ppara. The CREBH-APOA5 axis activation upon PR was intact in mice lacking the GCN2-dependent amino acid-sensing arm of the integrated stress response. However, constitutive hepatic activation of the amino acid-responsive kinase mTORC1 compromised CREBH activation, leading to blunted APOA5 expression and PR-recalcitrant hypertriglyceridemia. PR also contributed to hypotriglyceridemia by reducing the rate of VLDL-TG secretion, independently of activation of the CREBH-APOA5 axis. Finally, a randomized controlled clinical trial revealed that 4-6 weeks of reduced protein intake (7%-9% of calories) decreased VLDL particle number, increased VLDL-bound APOA5 expression, and lowered plasma TGs, consistent with mechanistic conservation of PR-mediated hypotriglyceridemia in humans with translational potential as a nutraceutical intervention for dyslipidemia.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-11-02 |