title: [Expression of pulmonary surfactant-associated protein D and its significance in human fetal lung].
abstract: OBJECTIVE
  To observe the expression of pulmonary surfactant-associated protein D (SP-D) during human fetal lung development.
  
  
  METHODS
  Human fetal lung tissues from 11- to 36-week-old fetuses were assayed for lung maturity with HE staining and SP-D expression by means of immunohistochemistry.
  
  
  RESULTS
  SP-D expression was located in the bronchial epithelium and alveolar epithelial type II cells(AEC II) of the lung tissues since the 12th week, and gradually increased during the canalicular to saccular stages with fetal development, at the point of which SP-D-positivity began a shift from the proximal bronchial epithelium to AEC II , and evidently located in the alveoli from the advanced stage of lung development till postnatal stage.
  
  
  CONCLUSIONS
  SP-D expression gradually intensifies with the maturation of the fetal lungs, and SP-D-positive cells begin to be detected in the bronchial epithelium and finally in AEC II.
authors.affiliation: Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China. cwn2@sohu.com
authors.forename: Yue
authors.initials: Y
authors.lastname: Chen
authors.forename: Jiang
authors.initials: J
authors.lastname: DU
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
authors.forename: Zhi-Chun
authors.initials: ZC
authors.lastname: Feng
mesh_terms: D000328:Adult; D004847:Epithelial Cells / Q000378:metabolism; D005260:Female; D005333:Fetus; D006801:Humans; D007150:Immunohistochemistry; D008168:Lung / Q000196:embryology* / Q000378:metabolism*; D011247:Pregnancy; D011650:Pulmonary Alveoli / Q000166:cytology / Q000378:metabolism; D037663:Pulmonary Surfactant-Associated Protein D / Q000096:biosynthesis*; D011663:Pulmonary Surfactants
chemical_list: D037663:Pulmonary Surfactant-Associated Protein D; D011663:Pulmonary Surfactants