Distribution of soluble N-ethylmaleimide fusion protein attachment proteins (SNAPs) in the rat nervous system.
Neuroscience
; 107(3): 363-71, 2001.
Article
em En
| MEDLINE
| ID: mdl-11718992
ABSTRACT
Soluble N-ethylmaleimide-sensitive fusion protein (NSF) attachment protein (SNAP) plays an essential role in vesicular transport and the release of neurotransmitters and hormones through associations with NSF and SNAP receptors (SNAREs). Three isoforms (alpha, beta and gamma) of SNAP are expressed in mammals. We have generated isoform-specific antibodies and studied the expression and distribution of these SNAP isoforms in the rat nervous system. Each antibody specifically recognized alpha-, beta- or gamma-SNAP in an isoform-specific manner in immunoblots of brain homogenate. Alpha- and gamma-SNAP were ubiquitously expressed in various tissues, whereas beta-SNAP was expressed only in brain. After subcellular fractionation of brain homogenates, all three isoforms were recovered in both soluble and particulate fractions. Immunohistochemistry revealed that alpha- and beta-SNAP were generally differentially distributed both in synaptic and non-synaptic regions, including brain white matter. The presynaptic location of both alpha- and beta-SNAP was confirmed by immunoelectron microscopy. At the neuromuscular junction, immunoreactive alpha-SNAP was identified in synaptic vesicles, while in the cerebellum, beta-SNAP was present in the presynaptic membranes of basket neuron and mossy fiber terminals. From these results we suggest that both alpha- and beta-SNAP may play an important role in neurotransmitter release as well as in constitutive vesicular transport.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Transporte
/
Proteínas de Transporte Vesicular
/
Proteínas de Membrana
/
Sistema Nervoso
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Neuroscience
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Japão