Antibacterial peptides in bronchoalveolar lavage fluid

D. Schnapp, A. Harris*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


Defensins and other antimicrobial peptides act in the innate host defense of epithelial surfaces. Human beta defensin 1 (hBD-1) has recently been shown to be expressed in airway epithelial cells and so has been implicated as a primary component of antibacterial activity in human lung. We attempted to purify these molecules from bronchoalveolar lavage fluid (BALF). Extraction of BALF on SepPak C-18 cartridges, followed by continuous acid-urea polyacrylamide gel electrophoresis and reverse-phase high-performance liquid chromatography yielded one fraction with antibacterial activity associated with factors of < 6.5 kD. N-terminal amino acid sequencing identified these peptides as human neutrophil defensins (HD) 1 through 3. No hBD-1 was detected. Together with lysozyme, it appears that HD-1 through -3 are the most prominent antimicrobial factors in BALF. The contribution of epithelial defensins such as hBD-1 to antibacterial defense of human airway in vivo remains to be elucidated. Schnapp, D., and A. Harris. 1998. Antibacterial peptides in bronchoalveolar lavage fluid. Am. J. Respir. Cell Mol. Biol. 19:352-356.

Original languageEnglish (US)
Pages (from-to)352-356
Number of pages5
JournalAmerican journal of respiratory cell and molecular biology
Issue number3
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry
  • Cell Biology

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