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Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems

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Potassium Sensitive Optical Nanosensors Containing Voltage Sensitive Dyes.

Xiaojiang Xie, Agustín Gutiérrez, Valentin Trofimov

|December 16, 2015

Summary

New K(+)-sensitive nanospheres incorporating voltage-sensitive dyes (VSDs) were created. These non-invasive nanosensors allow for intracellular potassium ion quantification and imaging in Dictyostelium discoideum.

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Area of Science:

Analytical Chemistry
Nanotechnology
Cell Biology

Background:

Ion-selective optical nanosensors are established analytical tools.
Voltage-sensitive dyes (VSDs) are recently integrated into nanosensors, creating novel analytical platforms.
Intracellular ion dynamics are crucial for cellular function.

Purpose of the Study:

To fabricate and characterize novel potassium ion (K(+))-sensitive nanospheres.
To incorporate a lipophilic VSD into these nanospheres for enhanced sensing capabilities.
To evaluate the non-invasive delivery and potential of these nanosensors for intracellular ion quantification and imaging in Dictyostelium discoideum.

Main Methods:

Fabrication of ion-selective nanospheres.
Incorporation of lipophilic voltage-sensitive dyes (VSDs).
Characterization of nanosensor properties.
Non-invasive delivery into Dictyostelium discoideum.

Main Results:

Successfully fabricated and characterized K(+)-sensitive nanospheres containing a lipophilic VSD.
Demonstrated non-invasive delivery of nanosensors into Dictyostelium discoideum.
Established a promising new platform for intracellular ion quantification and imaging.

Conclusions:

Developed novel K(+)-sensitive nanospheres with integrated VSDs.
Validated their utility for non-invasive intracellular ion sensing in a model organism.
Highlighted the potential of this technology for advancing cellular ion research.