title: Metabolic and cellular plasticity in white adipose tissue I: effects of beta3-adrenergic receptor activation.
abstract: Selective agonists of beta(3)-adrenergic receptors (Adrb3) exhibit potent anti-diabetes properties in rodent models when given chronically, yet the mechanisms involved are poorly understood. A salient feature of chronic Adrb3 activation is pronounced remodeling of white adipose tissue (WAT), which includes mitochondrial biogenesis and elevation of metabolic rate. To gain insights into potential mechanisms underlying WAT remodeling, the time course of remodeling induced by the Adrb3 agonist CL-316,243 (CL) was analyzed using histological, physiological, and global gene profiling approaches. The results indicate that continuous CL treatment induced a transient proinflammatory response that was followed by cellular proliferation among stromal cells and multilocular adipocytes. CL treatment strongly fragmented the central lipid storage droplet of mature adipocytes and induced mitochondrial biogenesis within these cells. Mitochondrial biogenesis was correlated with the upregulation of genes involved in fatty acid oxidation and mitochondrial electron transport activity. The elevated catabolic activity of WAT was temporally correlated with upregulation of peroxisome proliferator-activated receptor-alpha and its target genes, suggesting involvement of this transcription factor in coordinating the gene program that elevates WAT catabolic activity.
authors.affiliation: Department of Psychiatry, Wayne State University School of Medicine, Detroit, MI 48201, USA. jgranne@med.wayne.edu
authors.forename: James G
authors.initials: JG
authors.lastname: Granneman
authors.forename: Pipeng
authors.initials: P
authors.lastname: Li
authors.forename: Zhengxian
authors.initials: Z
authors.lastname: Zhu
authors.forename: Yuyan
authors.initials: Y
authors.lastname: Lu
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000273:Adipose Tissue / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism*; D058667:Adrenergic beta-3 Receptor Agonists; D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D048429:Cell Size / Q000187:drug effects; D004149:Dioxoles / Q000008:administration & dosage*; D004734:Energy Metabolism / Q000502:physiology*; D020869:Gene Expression Profiling; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008928:Mitochondria / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D022702:Receptors, Adrenergic, beta-3 / Q000378:metabolism*
chemical_list: D058667:Adrenergic beta-3 Receptor Agonists; D004149:Dioxoles; D022702:Receptors, Adrenergic, beta-3; C076126:disodium (R,R)-5-(2-((2-(3-chlorophenyl)-2-hydroxyethyl)-amino)propyl)-1,3-benzodioxole-2,3-dicarboxylate