The expression of voltage-dependent calcium channel beta subunits in human hippocampus.
Brain Res Mol Brain Res
; 60(2): 259-69, 1998 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-9757060
ABSTRACT
The beta subunits of voltage-dependent calcium channels (VDCC) modulate the electrophysiology and cell surface expression of pore-forming alpha1 subunits. In the present study we have investigated the distribution of beta1,beta2,beta3 and beta4 in the human hippocampus using in situ hybridization (ISH) and immunohistochemistry. ISH studies showed a similar distribution of expression of beta1,beta2 and beta3 subunit mRNAs, including labelling of the dentate granule cell layer, all CA pyramidal regions, and the subiculum. Relatively low levels of expression of beta1 and beta2 subunit mRNAs correlated with low protein expression in the immunocytochemical (ICC) studies. There was a relative lack of beta4 expression by both ISH and ICC in the CA1 region, compared with high levels of expression in the subiculum. Immunostaining for beta1 and beta2 subunits was weak and relatively homogeneous throughout the hippocampus. The beta3 and beta4 subunits appeared to be more discretely localized. In general, beta3-immunoreactivity was moderate both in cell bodies, and as diffuse staining in the surrounding neuropil. Strongest staining was observed in mossy fibres and their terminal region in the CA3 stratum lucidum. In contrast, beta4-immunoreactivity in the neuropil showed intense dendritic localisation. Unlike the other subunits, beta4-immunoreactivity was absent from CA1 pyramidal neurones but was present in a small population of interneurone-like cells. The localisation of beta3 and beta4 may represent presynaptic and postsynaptic compartments in some populations of hippocampal neurones. Comparison of beta subunit distribution with previously published data on alpha1 subunits indicates certain neuronal groups and subcellular compartments in which the subunit composition of native pre- and postsynaptic VDCC can be predicted.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Transcripción Genética
/
Canales de Calcio
/
Canales de Calcio Tipo N
/
Hipocampo
/
Neuronas
Límite:
Aged
/
Humans
/
Middle aged
Idioma:
En
Revista:
Brain Res Mol Brain Res
Asunto de la revista:
BIOLOGIA MOLECULAR
/
CEREBRO
Año:
1998
Tipo del documento:
Article
País de afiliación:
Reino Unido