Related Experiment Video
Updated: Jun 19, 2026
08:17
Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
Published on: July 4, 2011
Visualizing sodium dynamics in isolated cardiomyocytes using fluorescent nanosensors.
J Matthew Dubach1, Saumya Das, Anthony Rosenzweig
1Biomedical Engineering Group, The Charles Stark Draper Laboratory, 555 Technology Square, Cambridge, MA 02139, USA.
Summary
Researchers developed novel fluorescent nanosensors for real-time, selective imaging of sodium (Na+) dynamics during cellular action potentials. This breakthrough enables detailed study of sodium channel function and its role in diseases.
Area of Science:
- Cellular biology
- Neuroscience
- Cardiology
Background:
- Sodium flux is crucial for action potentials and cellular excitability in neurons and cardiomyocytes.
- Dysfunctional sodium channels are linked to neurological and cardiac diseases like epilepsy and heart failure.
- Current single-cell sodium imaging is limited by a lack of suitable fluorescent indicators.
Purpose of the Study:
- To develop and validate novel fluorescent nanosensors for real-time, spatially resolved imaging of sodium dynamics.
- To overcome limitations of existing sodium indicators for cellular studies.
- To investigate the role of sodium in action potential generation and cellular excitability.
Main Methods:
- Development of reversible, cation-selective fluorescent nanosensors for sodium (Na+).
- Validation of nanosensors in vitro using heterologous cells expressing voltage-gated sodium channel Na(V)1.7.
- Imaging of spatially defined sodium activity during action potentials.
Main Results:
- Successful detection of spatially defined sodium activity during action potentials using the novel nanosensors.
- Nanosensors demonstrated high selectivity for sodium over other cations like potassium.
- Drug-induced channel activation was successfully monitored in transfected cells.
Conclusions:
- The developed fluorescent nanosensors provide a powerful new tool for real-time, high-resolution imaging of cellular sodium dynamics.
- These nanosensors offer unprecedented insight into the role of sodium in action potential generation and membrane excitability.
- This technology has significant potential for understanding sodium channelopathies and developing new therapeutic strategies.
