Routes of acetylcholine leakage from cytosolic and vesicular compartments of rat motor nerve terminals.
Neurosci Lett
; 135(1): 5-9, 1992 Jan 20.
Article
em En
| MEDLINE
| ID: mdl-1542437
ABSTRACT
Acetylcholine efflux at the rat neuromuscular junction was assayed following blockage of ACh transport into synaptic vesicles by 2-(4-phenylpiperidino) cyclohexanol (AH5183). [2H4]Choline was used as a labeled precursor. AH5183 completely blocked ACh efflux from the cytosolic compartment but had comparatively less effect on release from the unlabeled vesicular pool. Tissue [2H4]ACh levels increased after AH5183 addition due to cytosolic ACh retention. Thus, ACh in the non-vesicular pool (calculated to be 34% of the total ACh) may efflux solely via the AH5183-sensitive ACh transporter inserted into the terminal membrane. ACh released from the vesicular fraction was about 100-fold more than could be accounted for by miniature end-plate potentials; possible causes of this overestimate are discussed.
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Base de dados:
MEDLINE
Assunto principal:
Piperidinas
/
Acetilcolina
/
Neurônios Motores
/
Terminações Nervosas
/
Fármacos Neuromusculares Despolarizantes
Idioma:
En
Ano de publicação:
1992
Tipo de documento:
Article