Botulinum neurotoxin C initiates two different programs for neurite degeneration and neuronal apoptosis.
J Cell Biol
; 168(4): 607-18, 2005 Feb 14.
Article
em En
| MEDLINE
| ID: mdl-15716378
ABSTRACT
Clostridial neurotoxins are bacterial endopeptidases that cleave the major SNARE proteins in peripheral motorneurons. Here, we show that disruption of synaptic architecture by botulinum neurotoxin C1 (BoNT/C) in central nervous system neurons activates distinct neurodegenerative programs in the axo-dendritic network and in the cell bodies. Neurites degenerate at an early stage by an active caspase-independent fragmentation characterized by segregation of energy competent mitochondria. Later, the cell body mitochondria release cytochrome c, which is followed by caspase activation, apoptotic nuclear condensation, loss of membrane potential, and, finally, cell swelling and lysis. Recognition and scavenging of dying processes by glia also precede the removal of apoptotic cell bodies, in line with a temporal and spatial segregation of different degenerative processes. Our results suggest that, in response to widespread synaptic damage, neurons first dismantle their connections and finally undergo apoptosis, when their spatial relationships are lost.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Toxinas Botulínicas
/
Apoptose
/
Mitocôndrias
/
Neurônios
Limite:
Animals
Idioma:
En
Revista:
J Cell Biol
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Reino Unido