Abstract
Polyclonal antisera generated to peptides corresponding to the carboxy termini of the seven cloned rat P2X receptors were compared using membranes from CHO-K1 or 1321N1 cells expressing recombinant rat or human P2X receptors (rat P2X3, P2X4, and P2X5 and human P2X1, P2X2, P2X6, and P2X7). Preimmune sera failed to recognize any bands in immunoblots against the membrane fractions. Antiserum to the P2X1 receptor recognized a band of approximately 58 kDa while those to the rP2X2 and the rP2X3 receptors recognized doublets of approximately 60 and 64 kDa. The antiserum to the rP2X4 receptor recognized a similarly sized doublet as well as a higher molecular weight species at the expected size for a receptor dimer. Antiserum to the rP2X5 receptor revealed a single band at 64 kDa while antiserum to rP2X6 and rP2X7 gave single bands at 50 kDa and 95 kDa, respectively. In all cases, immunoreactivity was eliminated by preincubation of the antisera with the cognate peptide and there was no cross-reactivity of antisera with heterologous receptors. These antisera are useful reagents for the analysis of the P2X receptor subtypes in native tissues as well as for measuring receptor expression levels in transfected cell lines. Drug Dev. Res. 47:189–195, 1999. © 1999 Wiley-Liss, Inc.
Published Version
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