title: Quantitative proteogenomic profiling of epidermal barrier formation in vitro.
abstract: BACKGROUND
  The barrier function of the epidermis is integral to personal well-being, and defects in the skin barrier are associated with several widespread diseases. Currently there is a limited understanding of system-level proteomic changes during epidermal stratification and barrier establishment.
  
  
  OBJECTIVE
  Here we report the quantitative proteogenomic profile of an in vitro reconstituted epidermis at three time points of development in order to characterize protein changes during stratification.
  
  
  METHODS
  The proteome was measured using data-dependent "shotgun" mass spectrometry and quantified with statistically validated label-free proteomic methods for 20 replicates at each of three time points during the course of epidermal development.
  
  
  RESULTS
  Over 3600 proteins were identified in the reconstituted epidermis, with more than 1200 of these changing in abundance over the time course. We also collected and discuss matched transcriptomic data for the three time points, allowing alignment of this new dataset with previously published characterization of the reconstituted epidermis system.
  
  
  CONCLUSIONS
  These results represent the most comprehensive epidermal-specific proteome to date, and therefore reveal several aspects of barrier formation and skin composition. The limited correlation between transcript and protein abundance underscores the importance of proteomic analysis in developing a full understanding of epidermal maturation.
authors: Institute for Systems Biology, 401 Terry Ave N., Seattle, WA 98109, USA.
authors: Jason M
authors: JM
authors: Winget
authors: Institute for Systems Biology, 401 Terry Ave N., Seattle, WA 98109, USA.
authors: Julian D
authors: JD
authors: Watts
authors: Institute for Systems Biology, 401 Terry Ave N., Seattle, WA 98109, USA.
authors: Michael R
authors: MR
authors: Hoopmann
authors: The Procter & Gamble Company, Mason Business Center, Cincinnati, OH 45040, USA.
authors: Teresa
authors: T
authors: DiColandrea
authors: The Procter & Gamble Company, Mason Business Center, Cincinnati, OH 45040, USA.
authors: Michael K
authors: MK
authors: Robinson
authors: The Procter & Gamble Company, Mason Business Center, Cincinnati, OH 45040, USA.
authors: Tom
authors: T
authors: Huggins
authors: The Procter & Gamble Company, Mason Business Center, Cincinnati, OH 45040, USA.
authors: Charles C
authors: CC
authors: Bascom
authors: The Procter & Gamble Company, Mason Business Center, Cincinnati, OH 45040, USA.
authors: Robert J
authors: RJ
authors: Isfort
authors: Institute for Systems Biology, 401 Terry Ave N., Seattle, WA 98109, USA. Electronic address: rmoritz@systemsbiology.org.
authors: Robert L
authors: RL
authors: Moritz
mesh_terms: D004817:Epidermis / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D010865:Pilot Projects; D040901:Proteomics; D019108:Tight Junctions / Q000502:physiology; D059467:Transcriptome
keywords: Barrier; Epidermal differentiation; Proteomics; Skin equivalent