NK-lysin, structure and function of a novel effector molecule of porcine T and NK cells

M. Andersson, H. Gunne, B. Agerberth, A. Boman, T. Bergman, B. Olsson, Å Dagerlind, H. Wigzell, H. G. Boman, G. H. Gudmundsson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

NK-lysin (NKL), a 78-residue antimicrobial peptide, was isolated from pig small intestine. Standard methods identified the peptide as basic, with six half-cystine residues in three intrachain disulphide bonds. The sequence showed 33% identity with a part of a putative gene product (NKG5) from activated T and NK cells. NK-lysin showed antibacterial activity against Escherichia coli and Bacillus megaterium and marked lytic activity against YAC-1, a NK sensitive tumour cell line, while sheep red blood cells were unaffected. The cDNA clone corresponding to NK-lysin has been characterized. We have also analyzed the cell and tissue specific expression and the induction of the gene. A lymphocyte fraction enriched in T and NK cells, stimulated by human interleukin-2 (IL-2), showed a 30-fold increase of the NKL transcript. NK-lysin specific mRNA is also detectable in spleen, bone marrow and colon. Immunostaining showed NKL to be present in different types of lymphocytes. Our results strongly suggest that NK-lysin is involved in the inducible cytotoxicity of T and NK cells.

Original languageEnglish
Pages (from-to)123-126
Number of pages4
JournalVeterinary Immunology and Immunopathology
Volume54
Issue number1-4
DOIs
Publication statusPublished - Nov 1996

Other keywords

  • antibacterial peptide
  • cDNA cloning
  • cytotoxic peptide
  • IL-2 induction

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