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12.02.2020 | original article | Ausgabe 7-8/2020

Wiener Medizinische Wochenschrift 7-8/2020

Orally administered gadolinium orthovanadate GdVO4:Eu3+ nanoparticles do not affect the hydrophobic region of cell membranes of leukocytes

Zeitschrift:
Wiener Medizinische Wochenschrift > Ausgabe 7-8/2020
Autoren:
PhD Associate Professor Anton S. Tkachenko, PhD Vladimir K. Klochkov, DSc, PhD Vladimir N. Lesovoy, DSc, PhD Valeriy V. Myasoedov, PhD Nataliya S. Kavok, PhD Anatolii I. Onishchenko, DSc, PhD Svetlana L. Yefimova, DSc, PhD Yevgen O. Posokhov
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Summary

Aim

To assess the phospholipid bilayer of white blood cells (WBCs) and the ability of leukocytes to generate reactive oxygen species (ROS) in rats orally exposed to GdVO4:Eu3+ nanoparticle (VNP) solution for 2 weeks by fluorescent probes—ortho-hydroxy derivatives of 2,5-diaryl‑1,3‑oxazole.

Methods

Steady-state fluorescence spectroscopy, i.e., a study by the environment-sensitive fluorescent probes 2‑(2′-OH-phenyl)-5-(4′-phenyl-phenyl)-1,3-oxazole (probe O6O) and 2‑(2′-OH-phenyl)-phenanthro[9,10]-1,3-oxazole (probe PH7), and flow cytometry, i.e., analysis of 2′,7′-dichlorofluorescein (DCF), a product of a dye 2′,7′-dichlorodihydrofluorescein diacetate (H2DCFDA), fluorescence in CD45+/7-aminoactinomycin D (7-AAD) cells, were used to evaluate the state of cell membranes and reactive oxygen species (ROS) generation in leukocytes of rats orally exposed to gadolinium orthovanadate nanoparticles(VNPs).

Results

No significant changes were detected in the spectra of the fluorescent probes bound to the WBCs from the rats orally exposed to nanoparticles in comparison with the corresponding spectra of the probes bound to the cells from the control group of animals. This indicates that in the case of the rats orally exposed to nanoparticles, no noticeable changes in physicochemical properties (i.e., in the polarity and the proton-donor ability) are observed in the lipid membranes of WBCs in the region where the probes locate. There was no statistically significant difference in the amount of ROShigh viable leukocytes in rats treated with VNPs and control samples.

Conclusion

Neither changes in the physical and chemical properties of the leukocyte membranes nor in ROS generation by WBCs are detected in the rats orally exposed to VNP solution for 2 weeks.

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