title: Insights into the multifactorial nature of preterm birth: proteomic profiling of the maternal serum glycoproteome and maternal serum peptidome among women in preterm labor.
abstract: OBJECTIVE
  The purpose of this study was to identify peptide classifiers that predict spontaneous preterm birth (SPTB) among women in preterm labor (PTL) and to demonstrate specific protein pathways that are activated in PTL.
  
  
  METHODS
  Serum from 110 women with PTL between 20 weeks and 33 weeks 6 days of gestation was subjected to glycoprotein purification, matrix-assisted laser desorption ionization time-of-flight mass spectrometry peptide profiling, 2-dimensional liquid chromatography tandem mass spectrometry, and pathway analysis. Women were divided into 2 groups: delivery at <34 weeks' gestation (SPTB group) and delivery at > or =34 weeks' gestation (PTL group).
  
  
  RESULTS
  Twenty-three peptide masses were identified that discriminated PTL from SPTB in 97% of cases. Fifty-two proteins were present differentially between PTL and SPTB; 48 of 52 proteins were classified into 1 of 4 functional pathways that were involved with PTL: (1) complement/coagulation cascade, (2) inflammation/immune response, (3) fetal-placental development, and (4) extracellular matrix proteins.
  
  
  CONCLUSIONS
  Among women in PTL, proteomic analysis of serum peptides and glycoproteins classifies women who will deliver preterm and identifies specific protein pathways at work among individuals with "idiopathic" PTL.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, OR, USA. pereiral@ohsu.edu
authors.forename: Leonardo
authors.initials: L
authors.lastname: Pereira
authors.forename: Ashok P
authors.initials: AP
authors.lastname: Reddy
authors.forename: Amanda L
authors.initials: AL
authors.lastname: Alexander
authors.forename: Xinfang
authors.initials: X
authors.lastname: Lu
authors.forename: Jodi A
authors.initials: JA
authors.lastname: Lapidus
authors.forename: Michael G
authors.initials: MG
authors.lastname: Gravett
authors.forename: Srinivasa R
authors.initials: SR
authors.lastname: Nagalla
mesh_terms: D000328:Adult; D016009:Chi-Square Distribution; D002853:Chromatography, Liquid; D015180:Electrophoresis, Gel, Two-Dimensional; D005260:Female; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D007752:Obstetric Labor, Premature / Q000378:metabolism*; D011247:Pregnancy; D047928:Premature Birth / Q000378:metabolism*; D020543:Proteome / Q000378:metabolism*; D040901:Proteomics; D053719:Tandem Mass Spectrometry
chemical_list: D006023:Glycoproteins; D020543:Proteome