By Geoffrey Burnstock Ph.D., D.Sc., F.A.A., Marcello Costa (auth.)
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Extra info for Adrenergic Neurons: Their Organization, Function and Development in the Peripheral Nervous System
0 E :> z 5 10 15 20 25 30 35 40 Fluorescence intensit y .!!! 50 ~ u 0 .... 0 E :> z 5 10 15 20 25 30 35 40 Fluorescence intensity Figure Io. Histochemical correlates of trans-synaptic induction. The distribution of fluorescence intensities of nerve cell bodies in the rat superior cervical ganglion. In intact ganglia (filled circles) of rats kept at 5 oc for 5 or 16 days, the percentage of cell bodies showing intense fluorescence is significantly greater than in contralateral decentralized ganglia (filled squares), in intact (open circles) or decentralized (open squares) ganglia of rats kept at room temperature.
A) Changes in tyrosine hydroxylase (T-OH) activity, protein and choline acetyl transferase (ChAc) activity in adult mouse superior cervical ganglia (SCG) following surgical decentralization. (b) Same as for (a) but in adult rat superior cervical ganglion. Since T -OH activity present in adrenergic neurons is in part a reflection of their synaptic input, the larger fall in T-OH activity in the mouse suggests that the level of preganglionic activity is higher in mouse than in rat. Reproduced with permission from Hendry, Iversen and Black, 1973.
Rapid fluctuations in physiological activity of the adrenergic neuron cause fast variations in noradrenaline synthesis in a range which depends on the total amount of synthetic enzymes available. This is, in turn, determined by the long term changes in physiological activity. Noradrenaline is metabolized within the neuron mainly by monoamine oxidase, and in extraneuronal tissues mainly by catechol-a-methyl-transferase. so 5 ADRENERGIC NEUROEFFECTOR TRANSMISSION Readers are referred to a number of reviews which approach this topic from widely different points of view (see for example, Burnstock & Holman, I963, I966; Bennett & Burnstock, I968; von Euler, I969; Holman, I969, I97o; Speden, I970; Axelsson, I97I; Geffen & Livett, I97I; de Potter, Chubb & De Schaepdryver, I972; Bennett, I973a, d; Bevan & Su, I973).
Adrenergic Neurons: Their Organization, Function and Development in the Peripheral Nervous System by Geoffrey Burnstock Ph.D., D.Sc., F.A.A., Marcello Costa (auth.)