title: Serum KL-6 and surfactant proteins A and D in pediatric interstitial lung disease.
abstract: OBJECTIVE
  To determine if serum KL-6, surfactant protein A (SP-A), and surfactant protein D (SP-D) levels are elevated in pediatric interstitial lung disease (ILD) and associated with pulmonary function and disease severity score.
  
  
  METHODS
  Serum KL-6, SP-A, and SP-D levels were measured by enzyme-linked immunosorbent assay in 10 children with ILD and in 10 healthy volunteers. In the ILD group, FEV1 percentage of predicted, FVC percentage of predicted, and ILD disease severity score were measured and correlated with serum KL-6, SP-A, and SP-D levels.
  
  
  RESULTS
  For the ILD and control groups, respectively, mean serum KL-6 was 4,523 U/mL and 206 U/mL (p = 0.007), mean serum SP-A was 133 ng/mL and 21 ng/mL (p = 0.003), and mean serum SP-D was 304 ng/mL and 75 ng/mL (p = 0.004). There was an inverse relationship between SP-A and FVC (p = 0.05), and between SP-D and FEV1 (p = 0.05). There was a direct relationship between SP-D and ILD score (p = 0.05).
  
  
  CONCLUSIONS
  Serum KL-6, SP-D and SP-D levels are elevated in children with ILD. SP-A and SP-D levels appear to correlate with some measures of disease severity.
authors.affiliation: Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
authors.forename: Qasem A
authors.initials: QA
authors.lastname: Al-Salmi
authors.forename: Joseph N
authors.initials: JN
authors.lastname: Walter
authors.forename: Giuseppe N
authors.initials: GN
authors.lastname: Colasurdo
authors.forename: Marianna M
authors.initials: MM
authors.lastname: Sockrider
authors.forename: E O'brian
authors.initials: EO
authors.lastname: Smith
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takahashi
authors.forename: Leland L
authors.initials: LL
authors.lastname: Fan
mesh_terms: D000293:Adolescent; D000941:Antigens / Q000097:blood*; D000951:Antigens, Neoplasm; D002648:Child; D004797:Enzyme-Linked Immunosorbent Assay; D005541:Forced Expiratory Volume; D006023:Glycoproteins / Q000097:blood*; D006801:Humans; D017563:Lung Diseases, Interstitial / Q000097:blood* / Q000503:physiopathology; D018396:Mucin-1; D009077:Mucins; D037662:Pulmonary Surfactant-Associated Protein A / Q000097:blood*; D037663:Pulmonary Surfactant-Associated Protein D / Q000097:blood*; D014797:Vital Capacity
chemical_list: D000941:Antigens; D000951:Antigens, Neoplasm; D006023:Glycoproteins; C060192:MUC1 protein, human; D018396:Mucin-1; D009077:Mucins; D037662:Pulmonary Surfactant-Associated Protein A; D037663:Pulmonary Surfactant-Associated Protein D