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2004:
Durand François; Brenier-Pinchart Marie-Pierre; Berger Francois; Marche Patrice N; Grillot Renée; Pelloux Hervé
Phosphatidylcholine-specific phospholipase C but not gamma interferon regulate gene expression and secretion of CC Chemokine Ligand-2 (CCL-2) by human astrocytes during infection by Toxoplasma gondii.
Parasite immunology 2004;
26(
10):.
We have used human astrocytoma-derived cells to investigate the cellular responses of central nervous system cells to Toxoplasma gondii infection. At 24 h post inoculation, the secretion of CCL-2 (or Monocyte Chemotactic Protein-1) was augmented six-fold over the control. This secretion was down-regulated by D609, a specific inhibitor of phosphatidylcholine-dependent phospholipase C (PC-PLC), but not modulated by gamma interferon (IFN-gamma). Ribonuclease protection assay analyses showed significant down-regulation of CCL-2 mRNA production during infection by Toxoplasma gondii when cells were treated by D609. The mRNA levels of the seven other chemokines studied were not modified by D609. CCL-2 seems to contribute to the cell recruitment during human cerebral reactivation of Toxoplasma gondii. Cellular production of this CC chemokine during toxoplasmosis may be regulated by a PC-PLC-dependent pathway.
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