title: Comparative proteome analysis of 3T3-L1 adipocyte differentiation using iTRAQ-coupled 2D LC-MS/MS.
abstract: Adipose tissue is critical in obesity and type II diabetes. Blocking of adipocyte differentiation is one of the anti-obesity strategies targeting on strong rise in fat storage and secretion of adipokine(s). However, the molecular basis of adipocyte differentiation and its regulation remains obscure. Therefore, we exposed 3T3-L1 cell line to appropriate hormonal inducers as adipocyte differentiation model. Using iTRAQ-coupled 2D LC-MS/MS, a successfully exploited high-throughput proteomic technology, we nearly quantitated 1,000 protein species and found 106 significantly altered proteins during adipocyte differentiation. The great majority of differentially expressed proteins were related to metabolism enzymes, structural molecules, and proteins involved in signal transduction. In addition to previously reported differentially expressed molecules, more than 20 altered proteins previously unknown to be involved with adipogenic process were firstly revealed (e.g., HEXB, DPP7, PTTG1IP, PRDX5, EPDR1, SPNB2, STEAP3, TPP1, etc.). The partially differential proteins were verified by Western blot and/or real-time PCR analysis. Furthermore, the association of PCX and VDAC2, two altered proteins, with adipocyte conversion was analyzed using siRNA method, and the results showed that they could contribute considerably to adipogenesis. In conclusion, our data provide valuable information for further understanding of adipogenesis.
authors.affiliation: Department of Histology & Embryology, Xiangya School of Medicine, Central South University, Changsha, Hunan 410078, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Ye
authors.forename: Huoming
authors.initials: H
authors.lastname: Zhang
authors.forename: Yi-Xuan
authors.initials: YX
authors.lastname: Yang
authors.forename: Huai-Dong
authors.initials: HD
authors.lastname: Hu
authors.forename: Siu Kwan
authors.initials: SK
authors.lastname: Sze
authors.forename: Wei
authors.initials: W
authors.lastname: Meng
authors.forename: Jingru
authors.initials: J
authors.lastname: Qian
authors.forename: Hong
authors.initials: H
authors.lastname: Ren
authors.forename: Bao-Lin
authors.initials: BL
authors.lastname: Yang
authors.forename: Ming-Ying
authors.initials: MY
authors.lastname: Luo
authors.forename: Xiaoqiong
authors.initials: X
authors.lastname: Wu
authors.forename: Wu
authors.initials: W
authors.lastname: Zhu
authors.forename: Wei-Jun
authors.initials: WJ
authors.lastname: Cai
authors.forename: Jian-Bin
authors.initials: JB
authors.lastname: Tong
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology* / Q000378:metabolism*; D000818:Animals; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology; D002853:Chromatography, Liquid / Q000379:methods*; D051379:Mice; D020543:Proteome / Q000378:metabolism*; D053719:Tandem Mass Spectrometry / Q000379:methods*; D000091346:Tripeptidyl-Peptidase 1
chemical_list: D020543:Proteome; C000717268:Tpp1 protein, mouse; D000091346:Tripeptidyl-Peptidase 1