Fibronectin in human bronchopulmonary lavage fluid. Elevation in patients with interstitial lung disease

S. I. Rennard, R. G. Crystal

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


Fibronectin is a major adhesive and opsonic glycoprotein found in plasma and tissues. Because this molecule appears to mediate a number of interactions between cells and extracellular matrix, and because the interstitial lung diseases are characterized by marked derangements of the pulmonary extracellular matrix, we evaluated fibronectin in the lower respiratory tract in patients with these disorders. Fibronectin could be detected in the bronchoalveolar lavage fluid of normals (11/11), as well as those with noninterstitial lung diseases (18/18), idiopathic pulmonary fibrosis (21/21), sarcoidosis (20/20), and other interstitial lung diseases (22/22). Compared with normal and those with noninterstitial lung disease, the levels in bronchoalveolar lavage of patients with interstitial disease were significantly higher (P < 0.01, all comparisons). This was true only for bronchoalveolar lavage fibronectin; plasma levels were similar in all study groups (P > 0.2, all comparisons). The lavage fluid fibronectin was intact antigenically and retained collagen binding capability, although in some cases of interstitial disease, the presence of lower molecular weight fragments suggested some degradation. Thus, fibronectin is a normal constituent of the epithelial fluid of the lower respiratory tract and is present in increased amounts in a significant number of individuals with interstitial lung disease.

Original languageEnglish (US)
Pages (from-to)113-122
Number of pages10
JournalJournal of Clinical Investigation
Issue number1
StatePublished - 1982

ASJC Scopus subject areas

  • Medicine(all)

Fingerprint Dive into the research topics of 'Fibronectin in human bronchopulmonary lavage fluid. Elevation in patients with interstitial lung disease'. Together they form a unique fingerprint.

Cite this