title: Clara cell secretory protein. Levels in BAL fluid after smoking cessation.
abstract: OBJECTIVE
  The bronchiolar Clara cell is a major target for tobacco smoke exposure. To improve our understanding of the putative regenerative/repair mechanism(s) in the bronchiolar epithelium, we measured the levels of the Clara cell secretory protein (CCSP) in BAL fluid in healthy volunteers following smoking cessation.
  
  
  METHODS
  BAL was performed before smoking cessation, and at 1, 3, 6, 9, and 15 months following smoking cessation, in eight healthy volunteers with a previous mean cigarette consumption of 19 pack-years. The levels of CCSP in BAL fluid were assessed in immunoblotting experiments using an antibody against human CCSP.
  
  
  RESULTS
  Significantly (p < 0.05) higher levels of CCSP in BAL fluid were observed at 3, 6, and 9 months after smoking cessation, while the levels of CCSP in BAL fluid at 15 months after smoking cessation were the same as those before smoking cessation.
  
  
  CONCLUSIONS
  Despite the long history of smoking among patients in the present study group, signs of early regeneration in the bronchiolar epithelium were noted, in that the levels of CCSP in BAL fluid were elevated at the indicated time points following smoking cessation. Furthermore, we propose that the insult to the bronchiolar epithelium made by cigarette smoking caused the levels of CCSP in the BAL fluid at 15 months after smoking cessation to return to the levels noted before smoking cessation. The present study suggests a role for CCSP as a marker for nonciliated bronchiolar cell function.
authors.affiliation: Department of Lung Medicine, Karolinska Institute, Huddinge, Sweden. olle.andersson@mednut.ki.se
authors.forename: O
authors.initials: O
authors.lastname: Andersson
authors.forename: T N
authors.initials: TN
authors.lastname: Cassel
authors.forename: C M
authors.initials: CM
authors.lastname: Sköld
authors.forename: A
authors.initials: A
authors.lastname: Eklund
authors.forename: J
authors.initials: J
authors.lastname: Lund
authors.forename: M
authors.initials: M
authors.lastname: Nord
mesh_terms: D000328:Adult; D001980:Bronchi / Q000166:cytology*; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry*; D004727:Endothelium / Q000166:cytology; D004791:Enzyme Inhibitors / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011506:Proteins / Q000032:analysis*; D013997:Time Factors; D020340:Tobacco Use Cessation; D014598:Uteroglobin
chemical_list: D004791:Enzyme Inhibitors; D011506:Proteins; C556389:SCGB1A1 protein, human; D014598:Uteroglobin