title: Developmental lung expression and transcriptional regulation of claudin-6 by TTF-1, Gata-6, and FoxA2.
abstract: BACKGROUND
  Claudins are transmembrane proteins expressed in tight junctions that prevent paracellular transport of extracellular fluid and a variety of other substances. However, the expression profile of Claudin-6 (Cldn6) in the developing lung has not been characterized.
  
  
  RESULTS
  Cldn6 expression was determined during important periods of lung organogenesis by microarray analysis, qPCR and immunofluorescence. Expression patterns were confirmed to peak at E12.5 and diminish as lung development progressed. Immunofluorescence revealed that Cldn6 was detected in cells that also express TTF-1 and FoxA2, two critical transcriptional regulators of pulmonary branching morphogenesis. Cldn6 was also observed in cells that express Sox2 and Sox9, factors that influence cell differentiation in the proximal and distal lung, respectively. In order to assess transcriptional control of Cldn6, 0.5, 1.0, and 2.0-kb of the proximal murine Cldn6 promoter was ligated into a luciferase reporter and co-transfected with expression vectors for TTF-1 or two of its important transcriptional co-regulators, FoxA2 and Gata-6. In almost every instance, TTF-1, FoxA2, and Gata-6 activated gene transcription in cell lines characteristic of proximal airway epithelium (Beas2B) and distal alveolar epithelium (A-549).
  
  
  CONCLUSIONS
  These data revealed for the first time that Cldn6 might be an important tight junctional component expressed by pulmonary epithelium during lung organogenesis. Furthermore, Cldn6-mediated aspects of cell differentiation may describe mechanisms of lung perturbation coincident with impaired cell junctions and abnormal membrane permeability.
authors: Felix R
authors: FR
authors: Jimenez
authors: Joshua B
authors: JB
authors: Lewis
authors: Samuel T
authors: ST
authors: Belgique
authors: Tyler T
authors: TT
authors: Wood
authors: Department of Physiology and Developmental Biology, Brigham Young University, 3054 Life Sciences Building, Provo, UT 84602, USA. paul_reynolds@byu.edu.
authors: Paul R
authors: PR
authors: Reynolds
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D057167:Claudins / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000502:physiology*; D050993:GATA6 Transcription Factor / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental; D051542:Hepatocyte Nuclear Factor 3-beta / Q000502:physiology*; D008168:Lung / Q000196:embryology / Q000254:growth & development* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D020545:Respiratory Mucosa / Q000254:growth & development / Q000378:metabolism; D014157:Transcription Factors; D014158:Transcription, Genetic / Q000502:physiology*
chemical_list: D057167:Claudins; D004268:DNA-Binding Proteins; C496503:Foxa2 protein, mouse; D050993:GATA6 Transcription Factor; D014157:Transcription Factors; C504004:Ttf1 protein, mouse; D051542:Hepatocyte Nuclear Factor 3-beta; C122101:claudin 6