title: Preliminary proteomic analysis on the alterations in follicular fluid proteins from women undergoing natural cycles or controlled ovarian hyperstimulation.
abstract: OBJECTIVE
  To study the differences in protein expression profiles of follicular fluid (FF) between controlled ovarian hyperstimulation (COH) and natural ovulatory cycles.
  
  
  METHODS
  Twelve infertile women undergoing in vitro fertilization and embryo transfer (IVF-ET), with matched clinical information, were retrospectively recruited in the IVF center of our university hospital, including six undergoing COH and another six with natural cycles. FF was sampled from dominant follicles with mature oocytes. Protein expression profiles in each FF sample were analyzed respectively using two-dimensional gel electrophoresis. Differentially expressed proteins were identified using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and validated by western blotting. Differentially expressed proteins were further analyzed using Ingenuity Pathway Analysis (IPA) software.
  
  
  RESULTS
  Two proteins were downregulated and 11 proteins were upregulated (change ≥1.5-fold, P < 0.05) in the COH group. We identified one down-egulated and seven upregulated proteins using MALDI-TOF MS. Four differentially expressed proteins, including transferrin, complement component C3 (C3), haptoglobin and alpha-1-antitrypsin (AAT), were further validated by rate nephelometry and western blotting analyses. The IPA analysis revealed a significant network involved in the humoral immune and inflammatory responses.
  
  
  CONCLUSIONS
  The eight differentially expressed proteins were related to immune and inflammatory responses in the ovary. Our results provide new insights into the influence of COH on follicular (spp) development and IVF outcomes.
authors.affiliation: The International Peace Maternity and Child Health Hospital of China welfare Institute, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
authors.forename: Yan-Ting
authors.initials: YT
authors.lastname: Wu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.forename: Jun-Yu
authors.initials: JY
authors.lastname: Zhang
authors.forename: Ning-Ning
authors.initials: NN
authors.lastname: Hou
authors.forename: Ai-Xia
authors.initials: AX
authors.lastname: Liu
authors.forename: Jie-Xue
authors.initials: JX
authors.lastname: Pan
authors.forename: Jie-Yang
authors.initials: JY
authors.lastname: Lu
authors.forename: Jian-Zhong
authors.initials: JZ
authors.lastname: Sheng
authors.forename: He-Feng
authors.initials: HF
authors.lastname: Huang
mesh_terms: D000328:Adult; D015180:Electrophoresis, Gel, Two-Dimensional; D005260:Female; D005307:Fertilization in Vitro; D015571:Follicular Fluid / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D007247:Infertility, Female / Q000235:genetics* / Q000473:pathology; D010053:Ovary / Q000378:metabolism*; D010062:Ovulation Induction; D014176:Protein Biosynthesis; D040901:Proteomics