Abstract
The response to ATP of peritoneal macrophages from wild-type (WT) and P2X7-invalidated (KO) mice was tested. Low concentrations (1–100 μM) of ATP transiently increased the intracellular concentration of calcium ([Ca2+]i) in cells from both mice. The inhibition of the polyphosphoinositide-specific phospholipase C with U73122 inhibited this response especially in WT mice suggesting that the responses coupled to P2Y receptors were potentiated by the expression of P2X7 receptors. One millimolar ATP provoked a sustained increase in the [Ca2+]i only in WT mice. The response to 10 μM ATP was potentiated and prolonged by ivermectin in both mice. One millimolar ATP increased the influx of extracellular calcium, decreased the intracellular concentration of potassium ([K+]i) and stimulated the secretion of interleukin-1β (IL-1β) only in cells from WT mice. Ten micromolar ATP in combination with 3 μM ivermectin reproduced these responses both in WT and KO mice. The secretion of IL-1β was also increased by nigericin in WT mice and the secretory effect of a combination of ivermectin with ATP in KO mice was suppressed in a medium containing a high concentration of potassium. In WT mice, 150 μM BzATP stimulated the uptake of YOPRO-1. Incubation of macrophages from WT and KO mice with 10 μM ATP resulted in a small increase of YOPRO-1 uptake, which was potentiated by addition of 3 μM ivermectin. The uptake of this dye was unaffected by pannexin-1 blockers. In conclusion, prolonged stimulation of P2X4 receptors by a combination of low concentrations of ATP plus ivermectin produced a sustained activation of the non-selective cation channel coupled to this receptor. The ensuing variations of the [K+]i triggered the secretion of IL-1β. Pore formation was also triggered by activation of P2X4 receptors. Higher concentrations of ATP elicited similar responses after binding to P2X7 receptors. The expression of the P2X7 receptors was also coupled to a better response to P2Y receptors.
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Abbreviations
- WT:
-
wild-type
- KO:
-
knockout
- PPI-PLC:
-
polyphosphoinositide-specific phospholipase C
- HBS:
-
HEPES-buffered saline
- TEEI buffer:
-
Tris/EGTA/EDTA/protease inhibitors buffer
- LPS:
-
lipopolysaccharide
- IL-1β:
-
interleukin-1β
- NMDG:
-
N-methyl-D-glucamine
- PBS:
-
phosphate-buffered saline
- BSA:
-
bovine serum albumin
- FBS:
-
fetal bovine serum
- HRP:
-
horseradish peroxidase
- PAGE:
-
polyacrylamide gel electrophoresis
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Acknowledgment
This work was supported by grant n° 3.4.528.07 from the Fonds National de la Recherche Scientifique Médicale to JPD and by grant n° BFU/2007-62728 BMC from the Ministry of Education to AM. SP was a postdoctoral fellow from the Fonds National de la Recherche Scientifique. The authors thank Ms. S Dulanto for her skillful technical help.
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Seil, M., El Ouaaliti, M., Fontanils, U. et al. Ivermectin-dependent release of IL-1beta in response to ATP by peritoneal macrophages from P2X7-KO mice. Purinergic Signalling 6, 405–416 (2010). https://doi.org/10.1007/s11302-010-9205-8
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DOI: https://doi.org/10.1007/s11302-010-9205-8