Chronic hypoxia inhibits Na+/Ca2+ exchanger expression in cortical astrocytes.
Neuroreport
; 17(6): 649-52, 2006 Apr 24.
Article
en En
| MEDLINE
| ID: mdl-16603928
ABSTRACT
Ca signalling is central to many diverse functions of astrocytes. Of the numerous proteins involved in Ca homeostasis, the Na(+)/Ca(2+) exchanger is of particular importance in signalling regulation. We have shown that Ca signaling is dramatically remodelled in astrocytes by periods of chronic hypoxia, in part by inhibition of Na(+)/Ca(2+) exchanger. Here, we demonstrate that bepridil-sensitive Ca extrusion (indicative of Na(+)/Ca(2+) exchanger activity) is suppressed following 24 h hypoxia (2.5 or 1% O2) owing to a loss of Na(+)/Ca(2+) exchanger expression, as determined using immunocytochemistry and Western blots. Hypoxic Na(+)/Ca(2+) exchanger 1 inhibition occurs at the level of transcription, as mRNA for Na(+)/Ca(2+) exchanger 1 was significantly suppressed by hypoxia. Our results show hypoxia perturbs Ca homeostasis in astrocytes via the suppression of Na(+)/Ca(2+) exchanger 1 expression.
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Bases de datos:
MEDLINE
Asunto principal:
Hipoxia de la Célula
/
Corteza Cerebral
/
Astrocitos
/
Intercambiador de Sodio-Calcio
Límite:
Animals
Idioma:
En
Revista:
Neuroreport
Asunto de la revista:
NEUROLOGIA
Año:
2006
Tipo del documento:
Article
País de afiliación:
Reino Unido