Identification and characterization of proteins in amniotic fluid that are differentially expressed before and after antenatal corticosteroid administration

Joon Ho Lee, Joong Shin Park, Errol R. Norwitz, Byoung Jae Kim, Chan Wook Park, Jong Kwan Jun, Hee Chul Syn

Research output: Contribution to journalArticle

9 Citations (Scopus)


Objective: We sought to examine changes in the intraamniotic proteomic environment after the administration of antenatal corticosteroids to women with impending preterm delivery. Study Design: Amniotic fluid samples were collected at the time of clinically indicated amniocentesis before and within 7 days of administration of antenatal corticosteroids for impending preterm delivery (n = 12). Proteins differentially expressed before and after corticosteroids were identified by surface-enhanced laser desorption/ionization time-of-flight mass spectrometry. They were isolated, characterized, and quantified by fast protein liquid chromatography, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, in-gel tryptic digestion, immunodepletion assays, enzyme-linked immunosorbent assay, and electrospray ionization tandem mass spectrometry. Results: Five protein peaks of interest were identified and characterized, all of which were significantly decreased after antenatal corticosteroid administration. These included 2 isoforms of transthyretin, albumin, prothrombin fragment 2, and lumican. Conclusion: Four proteins, identified and characterized in amniotic fluid, were differentially expressed with antenatal corticosteroid administration. These data may provide additional insight into the molecular mechanisms by which antenatal corticosteroids prevent neonatal complications.

Original languageEnglish
Pages (from-to)388.e1-388.e10
JournalAmerican Journal of Obstetrics and Gynecology
Issue number4
Publication statusPublished - 2010 Apr


All Science Journal Classification (ASJC) codes

  • Obstetrics and Gynaecology

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