Pool size estimations for dense-core vesicles in mammalian CNS neurons.
EMBO J
; 37(20)2018 10 15.
Article
en En
| MEDLINE
| ID: mdl-30185408
ABSTRACT
Neuropeptides are essential signaling molecules transported and secreted by dense-core vesicles (DCVs), but the number of DCVs available for secretion, their subcellular distribution, and release probability are unknown. Here, we quantified DCV pool sizes in three types of mammalian CNS neurons in vitro and in vivo Super-resolution and electron microscopy reveal a total pool of 1,400-18,000 DCVs, correlating with neurite length. Excitatory hippocampal and inhibitory striatal neurons in vitro have a similar DCV density, and thalamo-cortical axons in vivo have a slightly higher density. Synapses contain on average two to three DCVs, at the periphery of synaptic vesicle clusters. DCVs distribute equally in axons and dendrites, but the vast majority (80%) of DCV fusion events occur at axons. The release probability of DCVs is 1-6%, depending on the stimulation. Thus, mammalian CNS neurons contain a large pool of DCVs of which only a small fraction can fuse, preferentially at axons.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Axones
/
Sinapsis
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Neuritas
/
Cuerpo Estriado
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Vesículas Secretoras
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Hipocampo
Límite:
Animals
Idioma:
En
Revista:
EMBO J
Año:
2018
Tipo del documento:
Article
País de afiliación:
Países Bajos