What question did this study set out to answer?

The aim is to develop a sensitive enzymatic assay for measuring guanosine 3′:5′-cyclic monophosphate (cyclic GMP).

A New Enzymatic Assay for Guanosine 3′:5′-Cyclic Monophosphate and Its Application to the Ductus Deferens of the Rat

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The aim is to develop a sensitive enzymatic assay for measuring guanosine 3′:5′-cyclic monophosphate (cyclic GMP).
Developed an enzymatic procedure to convert cyclic GMP to GMP using cyclic nucleotide phosphodiesterase.
Conducted experiments in rat ductus deferens with agents carbachol and norepinephrine to observe cyclic GMP levels.
Used phosphodiesterase inhibitor 1-methyl-3-isobutylxanthine to assess changes in cyclic GMP and cyclic AMP concentrations.
Incubation with 0.1 mM carbachol caused a 3-fold increase in cyclic GMP content, peaking 2 min after addition.
0.01 mM norepinephrine increased cyclic GMP content by about 25% at 1 min and by 40% at 3 min.
Treatment with the phosphodiesterase inhibitor increased cyclic GMP content twofold and cyclic AMP by 50% after 3 min.

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Randomized trial demonstrates enzyme assay efficiency in measuring cyclic GMP in rat ductus deferens, suggesting improved methods.

Schultz et al. (1973) studied this question.

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