title: Decreased contents of surfactant proteins A and D in BAL fluids of healthy smokers.
abstract: Hydrophilic surfactant proteins, surfactant protein A (SP-A) and surfactant protein D (SP-D), have important roles in modulating the host defense functions in the peripheral airways. It has been reported that cigarette smoke may alter the component and function of pulmonary surfactant. In this study, we determined the contents of SP-A and SP-D in BAL fluids of healthy smokers and nonsmokers by enzyme-linked immunosorbent assay using monoclonal antibodies against each protein. The contents of SP-A and SP-D in BAL fluids were significantly (p<0.05) decreased in smokers compared to those in nonsmokers, although there was no significant difference of total phospholipid content between smokers and nonsmokers. These results suggest that the decreased levels of SP-A and SP-D in smokers may impair the host defense functions of surfactant in the peripheral airways and might have a crucial roles in the development of chronic obstructive lung disease.
authors.affiliation: Third Department of Internal Medicine, Sapporo Medical University, School of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Honda
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Kuroki
authors.forename: T
authors.initials: T
authors.lastname: Akino
authors.forename: S
authors.initials: S
authors.lastname: Abe
mesh_terms: D000293:Adolescent; D000328:Adult; D000911:Antibodies, Monoclonal; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry*; D004797:Enzyme-Linked Immunosorbent Assay; D006023:Glycoproteins / Q000032:analysis* / Q000276:immunology; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000209:etiology; D008875:Middle Aged; D010743:Phospholipids / Q000032:analysis; D010947:Plants, Toxic; D011510:Proteolipids / Q000032:analysis* / Q000276:immunology; D037662:Pulmonary Surfactant-Associated Protein A; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants / Q000032:analysis* / Q000276:immunology; D012906:Smoke / Q000009:adverse effects; D012907:Smoking / Q000276:immunology / Q000378:metabolism*; D014026:Nicotiana
chemical_list: D000911:Antibodies, Monoclonal; D006023:Glycoproteins; D010743:Phospholipids; D011510:Proteolipids; D037662:Pulmonary Surfactant-Associated Protein A; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants; D012906:Smoke