Journal
FEBS JOURNAL
Volume 274, Issue 12, Pages 3021-3033Publisher
WILEY
DOI: 10.1111/j.1742-4658.2007.05830.x
Keywords
alveolar epithelium; Caveolin-1; mouse lung; P2X7 receptor
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The P2X(7) receptor has recently been described as a marker for lung alveolar epithelial type I cells. Here, we demonstrate both the expression of P2X(7) protein and its partition into lipid rafts in the mouse lung alveolar epithelial cell line E10. A significant degree of colocalization was observed between P2X(7) and the raft marker protein Caveolin-1; also, P2X(7) protein was associated with caveolae. A marked reduction in P2X(7) immunoreactivity was observed in lung sections prepared from Caveolin-1-knockout mice, indicating that Caveolin-1 expression was required for full expression of P2X(7) protein. Indeed, suppression of Caveolin-1 protein expression in E10 cells using short hairpin RNAs resulted in a large reduction in P2X(7) protein expression. Our data demonstrate a potential interaction between P2X(7) protein and Caveolin-1 in lipid rafts, and provide a basis for further functional and biochemical studies to probe the physiologic significance of this interaction.
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