Serotonin reinnervation of the rat organum vasculosum laminae terminalis (OVLT) after 5,7-dihydroxytryptamine deafferentation.
The time course and pattern of serotonin (5-HT) reinnervation in the rat organum vasculosum laminae terminalis (OVLT) following intracerebroventricular administration of 5,7-dihydroxytryptamine were examined by means of [3H]5-HT uptake radioautography. 5-HT axonal varicosities reappeared in the OVLT within 3 months post-lesion. Six months later, they were found to have preferentially reinvested the neurohemal contact area (juxtavascular zone) of the organ. Regenerated terminals further increased in number. At the end of a 16-month survival time, they displayed normal-looking distributional patterns, similar to those of age-matched control animals, and formed new synaptic junctions in the juxtaventricular zone. The cellular mechanisms possibly responsible for 5-HT recovery in the OVLT are discussed.
Saïdi
H
H
Equipe de Neuromorphologie Fonctionnelle, Laboratoire de Neurobiologie, C.N.R.S., Marseille, France.
Bosler
O
O
D015116:5,7-Dihydroxytryptamine / Q000494:pharmacology*; D000818:Animals; D002552:Cerebral Ventricles / Q000187:drug effects / Q000502:physiology*; D003714:Denervation / Q000379:methods; D008297:Male; D009416:Nerve Regeneration / Q000502:physiology*; D009475:Neurons, Afferent / Q000187:drug effects*; D051381:Rats; D011919:Rats, Inbred Strains; D012701:Serotonin / Q000502:physiology*; D013495:Supraoptic Nucleus / Q000187:drug effects / Q000502:physiology*
D015116:5,7-Dihydroxytryptamine; D012701:Serotonin