Production of the soluble pattern recognition receptor PTX3 by myeloid, but not plasmacytoid, dendritic cells

Andrea Doni, Giuseppe Peri, Marcello Chieppa, Paola Allavena, Fabio Pasqualini, Luca Vago, Luigina Romani, Cecilia Garlanda, Alberto Mantovani

Research output: Contribution to journalArticle

Abstract

PTX3 is a prototypic of long pentraxin consisting of an N-terminal portion coupled to a C-terminal pentraxin domain, the latter related to short pentraxins (C-reactive protein and serum amyloid P component). PTX3 is a soluble pattern recognition receptor, which plays a non-redundant role in resistance against selected pathogens and in female fertility. The present study was designed to analyze the production of PTX3 by human dendritic cells (DC) and to define the role of different innate immunity receptors in its induction. Human monocyte-derived DC produced copious amounts of PTX3 in response to microbial ligands engaging different members of the Toll-like receptor (TLR) family (TLR1 through TLR6), whereas engagement of the mannose receptor had no substantial effect. DC were better producers of PTX3 than monocytes and macrophages. Freshly isolated peripheral blood myeloid DC produced PTX3 in response to diverse microbial stimuli. In contrast, plasmacytoid DC exposed to influenza virus or to CpG oligodeoxynucleotides engaging TLR9, did not produce PTX3. PTX3-expressing DC were present in inflammatory lymph nodes from HIV-infected patients. These results suggest that DC of myelomonocytic origin are a major source of PTX3, a molecule which facilitates pathogen recognition and subsequent activation of innate and adaptive immunity.

Original languageEnglish
Pages (from-to)2886-2893
Number of pages8
JournalEuropean Journal of Immunology
Volume33
Issue number10
DOIs
Publication statusPublished - Oct 2003

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Keywords

  • DC subsets
  • Pattern recognition receptors
  • Pentraxins
  • PTX3

ASJC Scopus subject areas

  • Immunology

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