Measurement of Second Messengers in Signal Transduction: cAMP and Inositol Phosphates
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- Abstract
- Table of Contents
- Materials
- Literature Cited
Abstract
cAMP acts as an intracellular mediator of hormone action and the importance of accurate quantitative determination of cAMP levels in cells and tissues is widely recognized. The most utilized procedures for the determination of adenylate cyclase activity in membranes are described here for measuring the conversion of [alpha?32 P]ATP into [32 P]cAMP after a two?step chromatographic separation. Also critical in signal tranduction is phosphoinositide turnover, which is linked to receptor activation resulting from changes in cytosolic calcium concentrations. Phosphoinositide turnover can be measured as described in this unit by labeling phospholipid pools with [3 H]?inositol and then analyzing for tritiated inositol phosphates.
Table of Contents
- Basic Protocol 1: Determination of Cyclic AMP Concentration in Cultured Cells
- Basic Protocol 2: Measurement of [3H]Cyclic AMP Accumulation in Synaptoneurosomes After Prelabeling with [3H]Adenine
- Basic Protocol 3: Measurement of Phosphoinositide Turnover in Synaptoneurosomes
- Reagents and Solutions
- Commentary
- Literature Cited
Materials
Basic Protocol 1: Determination of Cyclic AMP Concentration in Cultured Cells
Materials
Basic Protocol 2: Measurement of [3H]Cyclic AMP Accumulation in Synaptoneurosomes After Prelabeling with [3H]Adenine
Materials
Basic Protocol 3: Measurement of Phosphoinositide Turnover in Synaptoneurosomes
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Literature Cited
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