Epithelial antimicrobial peptides in host defense against infection

Respir Res. 2000;1(3):141-50. doi: 10.1186/rr25. Epub 2000 Oct 20.


One component of host defense at mucosal surfaces seems to be epithelium-derived antimicrobial peptides. Antimicrobial peptides are classified on the basis of their structure and amino acid motifs. Peptides of the defensin, cathelicidin, and histatin classes are found in humans. In the airways, alpha-defensins and the cathelicidin LL-37/hCAP-18 originate from neutrophils. beta-Defensins and LL-37/hCAP-18 are produced by the respiratory epithelium and the alveolar macrophage and secreted into the airway surface fluid. Beside their direct antimicrobial function, antimicrobial peptides have multiple roles as mediators of inflammation with effects on epithelial and inflammatory cells, influencing such diverse processes as proliferation, immune induction, wound healing, cytokine release, chemotaxis, protease-antiprotease balance, and redox homeostasis. Further, antimicrobial peptides qualify as prototypes of innovative drugs that might be used as antibiotics, anti-lipopolysaccharide drugs, or modifiers of inflammation.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Amino Acid Sequence / genetics
  • Animals
  • Anti-Infective Agents / metabolism
  • Antimicrobial Cationic Peptides / metabolism
  • Cathelicidins
  • Defensins / metabolism
  • Humans
  • Immunologic Factors / genetics
  • Immunologic Factors / metabolism*
  • Molecular Sequence Data
  • Proteins / metabolism
  • Respiratory Mucosa / metabolism*
  • Respiratory Tract Infections / prevention & control*


  • Anti-Infective Agents
  • Antimicrobial Cationic Peptides
  • Cathelicidins
  • Defensins
  • Immunologic Factors
  • Proteins
  • histidine-rich proteins