ITCH modulates SIRT6 and SREBP2 to influence lipid metabolism and atherosclerosis in ApoE null mice
0301 basic medicine
Ubiquitin-Protein Ligases
610
Settore MED/49 - SCIENZE TECNICHE DIETETICHE APPLICATE
Article
Mice
03 medical and health sciences
Apolipoproteins E
Animals
Sirtuins
Bone Marrow Transplantation
Inflammation
Mice, Knockout
0303 health sciences
Macrophages
Settore MED/09 - MEDICINA INTERNA
Ubiquitination
Atherosclerosis
Lipid Metabolism
Mitochondria
3. Good health
Fatty Liver
Disease Models, Animal
Cholesterol
Liver
Oxidation-Reduction
Sterol Regulatory Element Binding Protein 2
DOI:
10.1038/srep09023
Publication Date:
2015-03-17T10:49:23Z
AUTHORS (9)
ABSTRACT
AbstractAtherosclerosis is a chronic inflammatory disease characterized by the infiltration of pro-inflammatory macrophages into a lipid-laden plaque. ITCH is an E3 ubiquitin ligase that has been shown to polarize macrophages to an anti-inflammatory phenotype. We therefore investigated the effect of ITCH deficiency on the development of atherosclerosis. ApoE−/−ITCH−/− mice fed a western diet for 12 weeks showed increased circulating M2 macrophages together with a reduction in plaque formation. Bone marrow transplantation recreated the haemopoietic phenotype of increased circulating M2 macrophages but failed to affect plaque development. Intriguingly, the loss of ITCH lead to a reduction in circulating cholesterol levels through interference with nuclear SREBP2 clearance. This resulted in increased LDL reuptake through upregulation of LDL receptor expression. Furthermore, ApoE−/−ITCH−/− mice exhibit reduced hepatic steatosis, increased mitochondrial oxidative capacity and an increased reliance on fatty acids as energy source. We found that ITCH ubiquitinates SIRT6, leading to its breakdown and thus promoting hepatic lipid infiltration through reduced fatty acid oxidation. The E3 Ubiquitin Ligase ITCH modulates lipid metabolism impacting on atherosclerosis progression independently from effects on myeloid cells polarization through control of SIRT6 and SREBP2 ubiquitination. Thus, modulation of ITCH may provide a target for the treatment of hypercholesterolemia and hyperlipidemia.
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