Pelegrin P, Surprenant A. Pannexin-1 mediates large pore formation and interleukin-1beta release by the ATP-gated P2X7 receptor.
EMBO J 2006;
25:5071-82. [PMID:
17036048 PMCID:
PMC1630421 DOI:
10.1038/sj.emboj.7601378]
[Citation(s) in RCA: 1144] [Impact Index Per Article: 63.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Accepted: 09/08/2006] [Indexed: 12/24/2022] Open
Abstract
P2X(7) receptors are ATP-gated cation channels; their activation in macrophage also leads to rapid opening of a membrane pore permeable to dyes such as ethidium, and to release of the pro-inflammatory cytokine, interleukin-1beta (IL-1beta). It has not been known what this dye-uptake path is, or whether it is involved in downstream signalling to IL-1beta release. Here, we identify pannexin-1, a recently described mammalian protein that functions as a hemichannel when ectopically expressed, as this dye-uptake pathway and show that signalling through pannexin-1 is required for processing of caspase-1 and release of mature IL-1beta induced by P2X(7) receptor activation.
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