Abstract
A convenient, inexpensive assay was developed for measuring relative changes in cyclic GMP in whole mouse neuroblastoma cells (clone NIE 115) based on labelling the cellular GTP pool with [8(-3)H]guanine. The time course of cell labelling and the distribution of radioactivity among possible products were studied; GTP is the only major labelled species. Radioactive cyclic GMP produced from the radioactive GTP on cell stimulation is isolated by column chromatography nad its identity has been rigorously established by paper chromatography and ion-exchange chromatography. The assay was used to study the time course of the cyclic GMP changes that occur after stimulation of neuroblastoma cells with carbamoylcholine and the dependence of the cyclic GMP changes on the carbamoylcholine concentration. The assay gives results comparable with those obtained by using a radioimmunoassay for cyclic GMP and should be applicable to other whole-cell and tissue-slice systems.
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Selected References
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