Blocking VLDL secretion causes hepatic steatosis but does not affect peripheral lipid stores or insulin sensitivity in mice

Détails

ID Serval
serval:BIB_07B785837DC7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Blocking VLDL secretion causes hepatic steatosis but does not affect peripheral lipid stores or insulin sensitivity in mice
Périodique
Journal of Lipid Research
Auteur(s)
Minehira  K., Young  S. G., Villanueva  C. J., Yetukuri  L., Oresic  M., Hellerstein  M. K., Farese, R. V., Jr. , Horton  J. D., Preitner  F., Thorens  B., Tappy  L.
ISSN
0022-2275
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
49
Numéro
9
Pages
2038-2044
Langue
anglais
Résumé
The liver secretes triglyceride-rich VLDLs, and the triglycerides in these particles are taken up by peripheral tissues, mainly heart, skeletal muscle, and adipose tissue. Blocking hepatic VLDL secretion interferes with the delivery of liver-derived triglycerides to peripheral tissues and results in an accumulation of triglycerides in the liver. However, it is unclear how interfering with hepatic triglyceride secretion affects adiposity, muscle triglyceride stores, and insulin sensitivity. To explore these issues, we examined mice that cannot secrete VLDL [due to the absence of microsomal triglyceride transfer protein (Mttp) in the liver]. These mice exhibit markedly reduced levels of apolipoprotein B-100 in the plasma, along with reduced levels of triglycerides in the plasma. Despite the low plasma triglyceride levels, triglyceride levels in skeletal muscle were unaffected. Adiposity and adipose tissue triglyceride synthesis rates were also normal, and body weight curves were unaffected. Even though the blockade of VLDL secretion caused hepatic steatosis accompanied by increased ceramides and diacylglycerols in the liver, the mice exhibited normal glucose tolerance and were sensitive to insulin at the whole-body level, as judged by hyperinsulinemic euglycemic clamp studies. Normal hepatic glucose production and insulin signaling were also maintained in the fatty liver induced by Mttp deletion. Thus, blocking VLDL secretion causes hepatic steatosis without insulin resistance, and there is little effect on muscle triglyceride stores or adiposity
Mots-clé
Adipose Tissue , Animals , blood , Body Weight , Carrier Proteins , chemistry , etiology , Fatty Liver , genetics , Glucose , Heart , Insulin , Insulin Resistance , Lipid Metabolism , Lipids , Lipoproteins,VLDL , metabolism , Mice , Muscle,Skeletal , Proteins , secretion , Triglycerides
Pubmed
Web of science
Open Access
Oui
Création de la notice
29/01/2009 23:12
Dernière modification de la notice
08/05/2019 14:02
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