Targeting of peptidergic vesicles in cotransmitting terminals.
J Neurosci
; 21(3): RC127, 2001 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-11157098
ABSTRACT
In the present study, we examined the targeting of neuropeptide-containing vesicles in terminals of neurons that release both neuropeptides and classical transmitters. Single neurons were electrically stimulated with patterns of activity that were recorded in freely behaving animals. The amount of peptide release was measured biochemically using a radioimmunoassay, and the targeting of peptidergic vesicles was quantified using immunoelectronmicroscopy. Repeated electrical stimulation of single neurons produced a very large increase in peptide release. Peptide release is paralleled by a twofold increase in the number of peptidergic vesicles docked at the portion of the terminal membrane that is away from the target muscle. This is in stark contrast to cholinergic vesicles, which aggregate at, and are released from the conventional release sites in close apposition to the muscle. This differential targeting of cholinergic and peptidergic vesicles may play a significant role in the distinct release requirements and spatial and temporal characteristics of the actions of conventional and peptidergic transmitters.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Vesículas Sinápticas
/
Terminações Pré-Sinápticas
/
Transmissão Sináptica
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article