Receptors for IgG complexes activate synthesis of monocyte chemoattractant peptide 1 and colony-stimulating factor 1

K. Hora, J. A. Satriano, A. Santiago, T. Mori, E. R. Stanley, Z. Shan, D. Schlondorff

Research output: Contribution to journalArticle

116 Scopus citations

Abstract

The chemotactic factors responsible for complement-independent macrophage accumulation in immune-complex diseases such as glomerulonephritis remain unknown. Fc receptors for IgG complexes are found on mesangial cells of the kidney, which produce the macrophage growth factor colony-stimulating factor 1 (CSF-1). We therefore investigated the possible stimulation of mesangial- cell expression of CSF-1 and the recently identified monocyte-specific chemoattractant protein 1 (MCP-1) by IgG complexes. IgG complexes, but not monomeric IgG or F(ab')2 fragments of IgG, rapidly (2-8 h) increased mRNA for both CSF-1 (10-fold) and MCP-1 (20-fold) in cultured mouse mesangial cells. The increase of mRNA for CSF-1 and MCP-1 was not reduced by either cytochalasin B or D, indicating that Fc receptor occupancy is sufficient for signaling and that phagocytosis is not required to elicit this response. IgG complexes also caused a 10-fold increase in the secretion of CSF-1 and a 3- to 5-fold increase in secretion of MCP-1 into the cell culture medium. The synthesis and release of CSF-1 and MCP-1 by mesangial cells as a consequence of Fc receptor occupancy may be responsible for macrophage recruitment and activation at sites of immune-complex deposition.

Original languageEnglish (US)
Pages (from-to)1745-1749
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume89
Issue number5
DOIs
StatePublished - Jan 1 1992

Keywords

  • glomerulonephritis
  • immune complexes
  • mesangial cells

ASJC Scopus subject areas

  • General

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