Dissimilar and similar functional properties of complement receptor-3 in microglia and macrophages in combating yeast pathogens by phagocytosis

Smadar Hadas, Fanny Reichert, Shlomo Rotshenker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Central nervous system (CNS) microglia (MG) and peripheral tissue macrophages (MO) remove pathogens by phagocytosis. Zymosan, a model yeast pathogen, is a β-glucan rich particle that readily activates the complement system and then becomes C3bi-opsonized (op). Complement receptor-3 (CR3) has initially been implicated in mediating the phagocytosis of both C3bi-op and non-opsonized (nop) zymosan by MO through C3bi and β-glucan binding sites, respectively. Later, the role of CR3 as a phagocytic b-glucan receptor has been questioned and the supremacy of β-glucan receptor Dectin-1 advocated. We compare here between primary mouse CNS MG and peripheral tissue MO with respect to CR3 and Dectin-1 mediated phagocytosis of C3biop and nop zymosan. We report that MG and MO display similar as well as dissimilar functional properties in this respect. Although CR3 and Dectin-1 function both as b-glucan/ non-opsonic receptors in MG during nop zymosan phagocytosis, Dectin-1, but not CR3, does so in MO. CR3 functions also as a C3bi/opsonic receptor in MG and MO during C3bi-op zymosan phagocytosis, leading to phagocytosis which is more efficient than that of nop zymosan. Dectin-1 contributes, albeit less than CR3, to phagocytosis of C3bi-op zymosan in MG and further less in MO, suggesting that C3bi-opsonization does not block all β-glucan sites on zymosan from binding Dectin-1 on phagocytes. Thus, altogether CR3 and Dectin-1 contribute both to phagocytosis of nop and C3bi-op zymosan in MG, whereas MO switch from CR3-independent/Dectin-1- dependent phagocytosis of nop zymosan to phagocytosis of C3bi-op zymosan where CR3 dominates over Dectin-1.

Original languageEnglish
Pages (from-to)823-830
Number of pages8
JournalGLIA
Volume58
Issue number7
DOIs
StatePublished - May 2010

Keywords

  • αM/β2
  • β-glucan
  • CD11b/CD18
  • Dectin-1
  • Integrin
  • Zymosan

Fingerprint

Dive into the research topics of 'Dissimilar and similar functional properties of complement receptor-3 in microglia and macrophages in combating yeast pathogens by phagocytosis'. Together they form a unique fingerprint.

Cite this