Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 305, Issue 4, Pages 964-969Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0006-291X(03)00863-5
Keywords
odorant; olfactory receptor; G-protein; calcium imaging; cAMP; zif268; mouse; HEK293; PC12h; Xenopus lacuis oocyte
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Odorant responsiveness of a mouse olfactory receptor, mOR-EG, was investigated in various heterologous cells using a variety of detection methods. Odorant-induced Ca2+ response was observed in HEK293 cells that coexpressed mOR-EG and the promiscuous G protein, Galpha15. Without Galpha15, a robust increase in cAMP level was observed upon odorant-stimulation in various mammalian cells. A luciferase reporter gene assay using zif268 promoter was adopted to amplify the cAMP signals. In Xenopus laeVis oocytes, odorant-stimulated currents were recorded when mOR-EG cRNA was co-injected with either Galpha15 or cAMP-dependent channel. These results suggest that odorant responsiveness can be monitored via a signaling pathway mediated by endogenous Galphas or transfected Galpha15 in heterologous cell systems. Various functional assays for a heterologously expressed olfactory receptor reported in this study, are potentially useful for high-throughput ligand screening and functional analyses of hundreds of olfactory receptors. (C) 2003 Elsevier Science (USA). All rights reserved.
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