title: Gene expression profiling of human bone marrow-derived mesenchymal stem cells during adipogenesis.
abstract: BACKGROUND
  Adipogenesis comprises multiple processes by which mesenchymal stem cells differentiate into adipocytes. To increase our knowledge of the mechanism underlying adipogenic differentiation of human bone marrow mesenchymal stem cells (hMSCs), we performed full-genome gene expression microarray and gene ontology analyses of induced differentiation of hMSCs.
  
  
  METHODS
  Adipogenic differentiation of hMSCs was induced by an adipogenic medium, and total RNA was extracted from undifferentiated hMSCs (day 0) and differentiated adipocytes (day 14). Then microarray hybridization of RNA samples was performed. The GeneChip Operating Software was used to analyze the hybridization data to identify differentially expressed genes, which were performed Gene Ontology categorization and pathway analysis. Pathway-act-network and genes-act-network were built according to the Kyoto Encyclopedia of Genes and Genomes database. Some differentially expressed genes were subjected to qRT-PCR to verify the microarray data.
  
  
  RESULTS
  We detected a total of 3,821 differentially expressed genes, of which 753 were upregulated and 3,068 downregulated. These genes were well represented in a variety of functional categories, including collagen fibril organization, brown fat cell differentiation, cell division, and S phase of mitotic cell cycle. Subsequently, pathway analysis was conducted, and significant pathways (from top 50) were selected for pathway-act-network analysis, which indicated that the mitogen-activated protein kinase (MAPK) pathway and cell cycle were of high degrees (> 10). Gene-act-network analysis showed that insulin-like growth factor 1 receptor (IGF1R), histone deacetylase 1 (HDAC1), HDAC2, MAPK13, MAPK8, phosphoinositide-3-kinase regulatory subunit 1 (PI3KR1), and PI3KR2 also had high degrees (> 18).
  
  
  CONCLUSIONS
  Collectively, these data provide novel information and could serve as a basis for future study to clarify the mechanisms underlying adipocyte differentiation of hMSCs.
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Xu
authors.forename: Xingnuan
authors.initials: X
authors.lastname: Li
authors.forename: Ruiqiao
authors.initials: R
authors.lastname: Yan
authors.forename: He
authors.initials: H
authors.lastname: Jiang
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.forename: Lili
authors.initials: L
authors.lastname: Fan
authors.forename: Jianfang
authors.initials: J
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Cao
authors.affiliation: Key Laboratory of System Bio-medicine of Jiangxi Province, Jiujiang University, Jiujiang, PR China. liweidong@outlook.com.
authors.forename: Weidong
authors.initials: W
authors.lastname: Li
mesh_terms: D017667:Adipocytes / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D052437:Adipocytes, Brown / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D050156:Adipogenesis / Q000235:genetics*; D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D002454:Cell Differentiation; D002478:Cells, Cultured; D020869:Gene Expression Profiling; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D012313:RNA / Q000235:genetics / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction
chemical_list: D012313:RNA
keywords: adipogenic differentiation; gene microarray; human bone marrow mesenchymal stem cells; pathway analysis; qRT-PCR