Pulmonary surfactant protein D in sera and bronchoalveolar lavage fluids.
Pulmonary surfactant protein D (SP-D) is a hydrophilic glycoprotein with a reduced molecular mass of 43 kDa and a member of the C-type lectin superfamily, along with mannose-binding proteins and surfactant protein A (SP-A). We have recently prepared monoclonal antibodies against human SP-D and developed an enzyme-linked immunosorbent assay (ELISA). In this study, the levels of SP-D in sera and bronchoalveolar lavage (BAL) fluids of patients with lung diseases were determined by ELISA, using human recombinant SP-D as a standard. We demonstrated that the concentrations of SP-D in sera are prominently increased in patients with idiopathic pulmonary fibrosis (IPF), interstitial pneumonia with collagen disease (IPCD), and pulmonary alveolar proteinosis (PAP). Patients with IPF, IPCD, and PAP exhibited levels of serum SP-D 5.1-fold, 7.2-fold, and 7.0-fold, respectively, of those in healthy volunteers; 91.5% of the patients with IPF, 81.3% with IPCD, and 100% with PAP exhibited serum SP-D levels that exceeded the cut-off value (mean + 2 SD of control value). Serum SP-D levels appeared to reflect the disease activity of IPF and IPCD and the disease severity of PAP. High levels of SP-D in BAL fluids were shown in patients with PAP, but not with IPF and IPCD. We conclude that measurement of SP-D in sera can provide an easily identifiable and useful clinical marker for the diagnosis of IPF, IPCD, and PAP, and can predict the disease activity of IPF and IPCD and the disease severity of PAP.
Third Department of Internal Medicine, Sapporo Medical University School of Medicine, Japan.
Y
Y
Honda
Y
Y
Kuroki
E
E
Matsuura
H
H
Nagae
H
H
Takahashi
T
T
Akino
S
S
Abe
D000328:Adult; D015415:Biomarkers / Q000032:analysis*; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry*; D002352:Carrier Proteins / Q000032:analysis / Q000097:blood; D003095:Collagen Diseases / Q000150:complications; D004797:Enzyme-Linked Immunosorbent Assay; D006023:Glycoproteins / Q000032:analysis* / Q000097:blood; D006801:Humans; D008171:Lung Diseases / Q000378:metabolism* / Q000628:therapy; D017563:Lung Diseases, Interstitial / Q000150:complications / Q000378:metabolism; D008875:Middle Aged; D011649:Pulmonary Alveolar Proteinosis / Q000378:metabolism; D011658:Pulmonary Fibrosis / Q000378:metabolism; D037663:Pulmonary Surfactant-Associated Protein D; D011663:Pulmonary Surfactants / Q000032:analysis* / Q000097:blood
D015415:Biomarkers; D002352:Carrier Proteins; D006023:Glycoproteins; D037663:Pulmonary Surfactant-Associated Protein D; D011663:Pulmonary Surfactants