Inhibition of antibody-dependent stimulation of lipoteichoic acid-treated human monocytes and macrophages by polyglycerolphosphate-reactive peptides

A. Gargir, I. Ofek*, D. Hasty, S. Meron-Sudai, H. Tsubery, Y. Keisari, A. Nissim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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By itself,lipoteichoic acid (LTA) obtained from S. pyogenes, S. aureus, or E. hirae poorly stimulated cytokine production by macrophages, whereas in the presence of anti-polyglycerol phosphate (PGP), the cells secreted significant amounts of IL-6. Two peptides constructed from the deduced sequence of the selected anti-PGP phage-antibody's complementary-determining region 3 of the variable heavy chain (VH-CDR3) reacted specifically with PGP. The monomeric form of the peptides markedly inhibited cytokine production by macrophages pretreated with LTA and anti-LTA. In contrast, the polyvalent form of biotinylated peptides complex with streptavidin-induced cytokine production by the LTA-treated macrophages. The data taken together support the concept that cross-linking of macrophage-bound LTA by anti-PGP is required for cytokine release by these cells. Importantly, these studies identified small, PGP-reactive peptides as potential tools in reducing this proinflammatory process.

Original languageEnglish
Pages (from-to)537-542
Number of pages6
JournalJournal of Leukocyte Biology
Issue number4
StatePublished - 2001


  • LTA
  • Macrophage stimulation
  • PGP
  • Phage display
  • Streptococci

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