title: Endothelial LRP1 regulates metabolic responses by acting as a co-activator of PPARγ.
abstract: Low-density lipoprotein receptor-related protein 1 (LRP1) regulates lipid and glucose metabolism in liver and adipose tissue. It is also involved in central nervous system regulation of food intake and leptin signalling. Here we demonstrate that endothelial Lrp1 regulates systemic energy homeostasis. Mice with endothelial-specific Lrp1 deletion display improved glucose sensitivity and lipid profiles combined with increased oxygen consumption during high-fat-diet-induced obesity. We show that the intracellular domain of Lrp1 interacts with the nuclear receptor Pparγ, a central regulator of lipid and glucose metabolism, acting as its transcriptional co-activator in endothelial cells. Therefore, Lrp1 not only acts as an endocytic receptor but also directly participates in gene transcription. Our findings indicate an underappreciated functional role of endothelium in maintaining systemic energy homeostasis.
authors.affiliation: Cardiovascular Research Institute and Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Hua
authors.initials: H
authors.lastname: Mao
authors.affiliation: Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
authors.forename: Pamela
authors.initials: P
authors.lastname: Lockyer
authors.affiliation: Cardiovascular Research Institute and Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Luge
authors.initials: L
authors.lastname: Li
authors.affiliation: Center for Cardiovascular Disease Prevention, Methodist DeBakey Heart and Vascular Center, Section of Cardiovascular Research, Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Christie M
authors.initials: CM
authors.lastname: Ballantyne
authors.affiliation: New York-Presbyterian Hospital, New York, New York 10065, USA.
authors.forename: Cam
authors.initials: C
authors.lastname: Patterson
authors.affiliation: Cardiovascular Research Institute and Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Xie
authors.affiliation: Cardiovascular Research Institute and Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Xinchun
authors.initials: X
authors.lastname: Pi
mesh_terms: D054392:Adipokines / Q000097:blood; D000818:Animals; D018955:CD36 Antigens / Q000378:metabolism; D002784:Cholesterol / Q000378:metabolism; D059305:Diet, High-Fat; D004705:Endocytosis / Q000187:drug effects; D042783:Endothelial Cells / Q000187:drug effects / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects; D005951:Glucose Tolerance Test; D057809:HEK293 Cells; D006801:Humans; D007333:Insulin Resistance; D008055:Lipids / Q000097:blood; D026503:Low Density Lipoprotein Receptor-Related Protein-1 / Q000378:metabolism*; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009928:Organ Specificity / Q000187:drug effects; D047495:PPAR gamma / Q000378:metabolism*; D010805:Physical Conditioning, Animal; D000077205:Pioglitazone; D011485:Protein Binding / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D045162:Thiazolidinediones / Q000494:pharmacology; D014158:Transcription, Genetic; D015430:Weight Gain
chemical_list: D054392:Adipokines; D018955:CD36 Antigens; D008055:Lipids; D026503:Low Density Lipoprotein Receptor-Related Protein-1; D047495:PPAR gamma; D012333:RNA, Messenger; D045162:Thiazolidinediones; D002784:Cholesterol; D000077205:Pioglitazone