Abstract
The concentration of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) was measured in developing chick ciliary (CG) and dorsal root ganglia (DRG) as a function of embryonic age from day 8 through day 18 using radioimmunoassays. The concentration of cAMP and cGMP increased in both ganglia from day 8 through day 14. cAMP levels were nearly two-fold higher in DRG than in CG. Normalization of the data for ciliary ganglia to the number of cells per ganglion and calculation of their molar concentrations indicates a 48% increase in cGMP and a 3.2-fold increase in cAMP during the developmental process of natural neuronal cell death.
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