Abstract:
:Experiments were carried out to determine if stimuli which augment preganglionic nerve activity to sympathetic neurons, and thereby cause trans-synaptic induction, increase the retrograde transport of nerve growth factor (NGF). It was found that nerve activity had no effect on retrograde transport of [125I]NGF. It was found, however, that reserpine decreased retrograde transport of [125I]NGF and this inhibition was characterized. Reserpine decreased the maximal accumulation of intravenously administered [125I]NGF in superior cervical ganglia (SCG) by about 60%. It also caused a distinct shift in the time course of accumulation so that maximal accumulation was seen 12 h after [125I]NGF injection rather than at 9 h as in control animals. Reserpine had no effect on retrograde transport in sensory neurons. Dose--response curves showed that maximal inhibition occurred with doses of reserpine of 2.5 mg/kg i.p. and that reserpine was not able to completely block transport at any dose. The maximal inhibition of retrograde transport was achieved within 30 min of reserpine administration and inhibitory activity was unchanged for 36 h. The ability of sympathetic neurons to transport [125I]NGF subsequently recovered and was normal 96 h after reserpine administration. The inhibitory effect of reserpine appears to be due to an action at or very near to the nerve terminal since it was effective at reducing NGF transport at very low doses (0.33 microgram) when co-administered directly into the eye with [125I]NGF. An action of reserpine at the nerve terminal was further suggested by the inability of reserpine to affect transport if the drug was given 4 h after [125I]NGF administration. Based upon these data, it is suggested that there may be two pools of retrogradely transported NGF and that only more rapidly turning over pool is reserpine-sensitive. This pool may represent the retrogradely moving synaptic vesicles or some derivative of the vesicles.
journal_name
Brain Resjournal_title
Brain researchauthors
Johnson EM Jr,Blumberg HM,Costrini NV,Bradshaw RAdoi
10.1016/0006-8993(79)90701-7subject
Has Abstractpub_date
1979-12-14 00:00:00pages
389-401issue
2-3eissn
0006-8993issn
1872-6240pii
0006-8993(79)90701-7journal_volume
178pub_type
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