Visualizing sodium dynamics in isolated cardiomyocytes using fluorescent nanosensors.
Proc Natl Acad Sci U S A
; 106(38): 16145-50, 2009 Sep 22.
Article
em En
| MEDLINE
| ID: mdl-19805271
ABSTRACT
Regulation of sodium flux across the cell membrane plays a vital role in the generation of action potentials and regulation of membrane excitability in cells such as cardiomyocytes and neurons. Alteration of sodium channel function has been implicated in diseases such as epilepsy, long QT syndrome, and heart failure. However, single cell imaging of sodium dynamics has been limited due to the narrow selection of fluorescent sodium indicators available to researchers. Here we report, the detection of spatially defined sodium activity during action potentials. Fluorescent nanosensors that measure sodium in real-time, are reversible and are completely selective over other cations such as potassium that were used to image sodium. The use of the nanosensors in vitro was validated by determining drug-induced activation in heterologous cells transfected with the voltage-gated sodium channel Na(V)1.7. Spatial information of sodium concentrations during action potentials will provide insight at the cellular level on the role of sodium and how slight changes in sodium channel function can affect the entirety of an action potential.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sódio
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Técnicas Biossensoriais
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Nanotecnologia
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Miócitos Cardíacos
Limite:
Animals
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Humans
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article