title: Interleukin-6 stimulates lipolysis in porcine adipocytes.
abstract: Interleukin (IL)-6 stimulates lipolysis in human and rodents adipocytes. However, the mechanism regulating this process is little known. In this study, we demonstrated that IL-6 increased lipolysis in differentiated porcine adipocytes by activation of extracellular signal-related kinase (ERK), which was inhibited by specific ERK inhibitor PD98059. IL-6 treatment did not elevate intracellular cAMP and specific PKA inhibitor H89 did not affect IL-6-induced lipolysis, which suggested that protein kinase A (PKA) pathway was not involved in IL-6-induced lipolysis. Also, the expressions of perilipin A and PPARgamma2 were significantly reduced in response to IL-6 treatment, but the expressions of peroxisome proliferators-activated receptor gamma coactivator-1 alpha (PGC-1alpha), carnitinepalmitoyl-transferase-1 (CPT-1), and uncoupling protein 2 (UCP2) were significantly elevated. In conclusion, these results suggested that chronic high dose of IL-6 directly stimulated lipolysis in porcine adipocytes through activation of ERK, subsequently repressing perilipin A and promoting PGC-1alpha expression.
authors.affiliation: Laboratory of Animal Fat Deposition and Muscle Development, College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi Province 712100, People's Republic of China. yyqing71@163.com
authors.forename: Yongqing
authors.initials: Y
authors.lastname: Yang
authors.forename: Dapeng
authors.initials: D
authors.lastname: Ju
authors.forename: Mingtao
authors.initials: M
authors.lastname: Zhang
authors.forename: Gongshe
authors.initials: G
authors.lastname: Yang
mesh_terms: D017667:Adipocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D002352:Carrier Proteins; D002454:Cell Differentiation; D002478:Cells, Cultured; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D050822:Cytokine Receptor gp130 / Q000235:genetics / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D005230:Fatty Acids, Nonesterified / Q000378:metabolism; D005260:Female; D005419:Flavonoids / Q000494:pharmacology; D015870:Gene Expression / Q000502:physiology; D015850:Interleukin-6 / Q000378:metabolism* / Q000494:pharmacology; D007546:Isoquinolines / Q000494:pharmacology; D008066:Lipolysis / Q000187:drug effects / Q000502:physiology*; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000502:physiology*; D008297:Male; D010084:Oxidation-Reduction; D047495:PPAR gamma / Q000235:genetics / Q000378:metabolism; D000070778:Perilipin-1; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology; D034421:Sus scrofa; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D005230:Fatty Acids, Nonesterified; D005419:Flavonoids; D015850:Interleukin-6; D007546:Isoquinolines; D047495:PPAR gamma; D000070778:Perilipin-1; D010750:Phosphoproteins; D047428:Protein Kinase Inhibitors; D013449:Sulfonamides; D014157:Transcription Factors; C111264:peroxisome-proliferator-activated receptor-gamma coactivator-1; D050822:Cytokine Receptor gp130; D017868:Cyclic AMP-Dependent Protein Kinases; D048049:Extracellular Signal-Regulated MAP Kinases; C063509:N-(2-(4-bromocinnamylamino)ethyl)-5-isoquinolinesulfonamide; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one