期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1981
卷号：78
期号：6
页码：3959-3963
DOI：10.1073/pnas.78.6.3959
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The activity of serotonin N-acetyltransferase (NATase) in the rat pineal gland exhibits a large (approximately 100-fold) circadian variation, with peak activity occurring in the dark part of the light/dark cycle. Surgical removal of both superior cervical ganglia abolishes this rhythm in enzyme activity. Unilateral ganglionectomy caused a 75% decrease in NATase activity during the dark period immediately following the operation; however, by the subsequent dark period (32 hr after operation) the rhythm in NATase activity had returned to normal. Similar results were found after the internal carotid nerve was cut, and data are presented indicating that this is the postganglionic trunk by which sympathetic neurons reach the pineal gland. Denervation of one superior cervical ganglion (unilateral "decentralization") also produced a 75% decrease in NATase activity during the dark period immediately following the operation; however, after decentralization, enzyme activity did not return to normal in subsequent cycles. It is hypothesized that this recovery is due to loss of norepinephrine uptake sites in the degenerating sympathetic nerve terminals. As a result of decreased norepinephrine uptake, the effectiveness of the norepinephrine released by surviving neurons may be enhanced. This hypothesis is supported by experiments in which pharmacological blockade of norepinephrine uptake in unilaterally decentralized animals increased NATase activity to control levels. We propose that neural systems which use transmitter uptake as the mechanism of transmitter inactivation have a built-in "reserve stimulatory capacity."
