title: Inhibition of adipogenic differentiation of bone marrow mesenchymal stem cells by erythropoietin via activating ERK and P38 MAPK.
abstract: We examined whether erythropoietin (EPO) can inhibit adipogenic differentiation of mesenchymal stem cells (MSCs) in the mouse bone marrow and its underlying mechanism. We separated and extracted mouse bone marrow MSCs and induced adipogenic differen-tiation using 3-isobutyl-1-methylxanthine, insulin, and dexamethasone. Different concentrations of EPO were added to the cells and observed by Oil Red O staining on the 20th day to quantitatively analyze the degree of cell differentiation. mRNA expression levels of peroxysome proliferator-activated receptor γ (PPARγ), CCAAT enhancer binding protein α, and adiponectin were analyzed by real-time quantitative polymerase chain reaction, and the activity of PPARγ, extracellular sig-nal-regulated kinase (ERK), and p38 mitogen-activated protein kinase (p38 MAPK) were determined by western blotting. EPO significantly inhibited adipogenic differentiation of MSCs after 20 days and reduced absorbance values by Oil Red O staining without affecting proliferation activity. EPO downregulated the mRNA expression of PPARγ, CCAAT enhancer binding protein α, fatty acid binding protein 4, and adiponec-tin during adipogenesis and increased protein phosphorylation of ERK, p38 MAPK, and PPARγ during differentiation. EPO downregulated the mRNA expression of PPARγ, CCAAT enhancer binding protein α, fatty acid binding protein 4, and adiponectin by increasing protein phosphor-ylation of ERK, p38 MAPK, and PPARγ during differentiation, which inhibited adipogenic differentiation of MSCs.
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China.
authors.forename: G X
authors.initials: GX
authors.lastname: Liu
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China.
authors.forename: J C
authors.initials: JC
authors.lastname: Zhu
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Chen
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China.
authors.forename: A Z
authors.initials: AZ
authors.lastname: Zhu
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China.
authors.forename: C C
authors.initials: CC
authors.lastname: Liu
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Lai
authors.affiliation: Hematology Institute of Ji'nan University, Guangzhou City,Guangdong Province, China liugexiu_lgx@163.com.
authors.forename: S T
authors.initials: ST
authors.lastname: Chen
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000037:antagonists & inhibitors / Q000494:pharmacology; D017667:Adipocytes / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D052242:Adiponectin / Q000235:genetics / Q000378:metabolism; D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D022762:CCAAT-Enhancer-Binding Proteins / Q000235:genetics / Q000378:metabolism; D002454:Cell Differentiation; D003907:Dexamethasone / Q000037:antagonists & inhibitors / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D004921:Erythropoietin / Q000494:pharmacology*; D050556:Fatty Acid-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation; D007328:Insulin / Q000494:pharmacology; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000235:genetics / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3 / Q000235:genetics / Q000378:metabolism*; D047495:PPAR gamma / Q000235:genetics / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D061251:Primary Cell Culture; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D048051:p38 Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism*
chemical_list: D052242:Adiponectin; C499919:Adipoq protein, mouse; D022762:CCAAT-Enhancer-Binding Proteins; C530718:CEBPA protein, mouse; C493411:Fabp4 protein, mouse; D050556:Fatty Acid-Binding Proteins; D007328:Insulin; D047495:PPAR gamma; D012333:RNA, Messenger; D004921:Erythropoietin; D003907:Dexamethasone; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048051:p38 Mitogen-Activated Protein Kinases; D015056:1-Methyl-3-isobutylxanthine