Enzyme-linked immunosorbent assay using F(ab')2 fragment for the detection of human pulmonary surfactant protein D in sera

Clin Chim Acta. 1997 Oct 31;266(2):157-71. doi: 10.1016/s0009-8981(97)00124-1.


We developed an enzyme-linked immunosorbent assay (ELISA) for detection of SP-D in serum using recombinant SP-D as a standard and horseradish peroxidase conjugated F(ab')2 fragment of mouse monoclonal antibody IgG to avoid the interaction of serum factors including rheumatoid factor. The use of F(ab')2 fragment dramatically decreased the value of serum SP-D concentration in rheumatoid arthritis patients without pulmonary complication to the close level of healthy volunteer. In contrast, the patients with collagen disease having interstitial pulmonary pneumonia exhibited consistently elevated levels of serum SP-D. The use of new ELISA with recombinant SP-D and F(ab')2 fragment of anti-SP-D monoclonal antibody gives a greater advantage for the accurate detection of SP-D in sera from patients with idiopathic pulmonary fibrosis, interstitial pneumonia with collagen disease and pulmonary alveolar proteinosis without interference of rheumatoid factor.

MeSH terms

  • Adult
  • Animals
  • Antibodies, Monoclonal
  • Collagen Diseases / blood
  • Enzyme-Linked Immunosorbent Assay / methods*
  • Glycoproteins / blood*
  • Horseradish Peroxidase
  • Humans
  • Immunoglobulin Fragments*
  • Immunoglobulin G
  • Lung Diseases, Interstitial / blood
  • Mice
  • Middle Aged
  • Pulmonary Alveolar Proteinosis / blood
  • Pulmonary Fibrosis / blood
  • Pulmonary Surfactant-Associated Protein D
  • Pulmonary Surfactants / blood*


  • Antibodies, Monoclonal
  • Glycoproteins
  • Immunoglobulin Fragments
  • Immunoglobulin G
  • Pulmonary Surfactant-Associated Protein D
  • Pulmonary Surfactants
  • Horseradish Peroxidase