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Labeling nanoparticles: Dye leakage and altered cellular uptake.

Sofie Snipstad¹, Sjoerd Hak^1,2, Habib Baghirov¹

¹Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.

Cytometry. Part a : the Journal of the International Society for Analytical Cytology

|April 15, 2016

Summary

Evaluating fluorescent dye stability in nanoparticles (NPs) is crucial. Dye leakage or altered NP behavior can skew results, emphasizing the need for rigorous testing of every dye-NP combination for reliable biodistribution and cellular uptake studies.

Keywords:

cellular uptake flow cytometry leakage liposomes nanoemulsions polymeric nanoparticles

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Area of Science:

Nanotechnology
Biomedical Engineering
Materials Science

Background:

Fluorescent dyes are commonly used to trace nanoparticles (NPs) in vitro and in vivo.
Dye leakage can lead to inaccurate interpretations of NP biodistribution, cellular uptake, and intracellular distribution.
NP labeling should not alter their inherent properties or interactions with biological systems.

Purpose of the Study:

To develop and apply a rapid screening method for assessing dye retention and NP-cell interactions.
To evaluate the stability of various dyes incorporated into different NP platforms.
To investigate the impact of dye labeling on NP cellular uptake.

Main Methods:

Utilized a generic flow cytometry assay involving cell incubation with labeled NPs at 4°C and 37°C.
Assessed NP-cell interaction by measuring cellular fluorescence at 37°C.
Confirmed NP-dye retention by the absence of cellular fluorescence at 4°C.

Main Results:

Screened three NP platforms labeled with six different dyes, revealing significant variability in dye retention.
Observed that trace amounts of certain dyes reduced or inhibited NP uptake.
Demonstrated the critical need for thorough evaluation of each dye-NP combination.

Conclusions:

The stability and impact of fluorescent dyes on nanoparticle behavior must be carefully assessed.
A simple flow cytometry assay can effectively screen dye retention and NP-cell interactions.
Unforeseen alterations in NP properties due to dye labeling necessitate pre-application validation.