Journal of Materials Science

, Volume 53, Issue 9, pp 6665–6680 | Cite as

Cytotoxicity, genotoxicity and uptake detection of folic acid-functionalized green upconversion nanoparticles Y2O3/Er3+, Yb3+ as biolabels for cancer cells

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Abstract

Upconversion nanoparticles (UCNPs) have been used as biolabels for cancer cells due to their ability to absorb near-infrared photons and upconvert them into visible radiation. We reported the synthesis of UCNPs Y2O3/Yb3+, Er3+ (1, 1 mol%), which upon excitation with infrared photons (λ = 980 nm) emit green color with a maximum peak centered at λ = 550 nm. UCNPs were functionalized with folic acid (UCNPs-NH2-FA) and analyzed by transmission electron microscopy, Fourier transform infrared spectroscopy, XRD, DLS and photoluminescence measurements. UCNPs-NH2-FA had a particle size of 70 ± 10 nm and exhibit a good luminescence spectrum in comparison with bare UCNPs. Cytotoxicity of different concentrations of bare and functionalized UCNPs was measured with the MTT assay in three cancer cell lines: human cervical adenocarcinoma (HeLa) and human breast adenocarcinoma cells (MDA-MB-231 and MCF-7). Some concentrations of bare UCNPs were cytotoxic for cells; however, after been functionalized, UCNPs resulted to be non-cytotoxic. Genotoxicity of bare and functionalized UCNPs was performed by the comet assay, and no DNA damage was found for any concentration. The internalization of UCNPs-NH2-FA into cancer cells was confirmed by confocal microscopy showing a cytoplasmic fluorescence signal. UCNPs-NH2-FA were used to detect cancer cells in suspension by flow cytometry, with a specific green fluorescent signal for effective detection of cells. These results confirm that functionalized UCNPs can be used without any cytotoxic or genotoxic effects for bioimaging to detect and visualize cancer cells.

Notes

Acknowledgements

The authors wish to acknowledge financial support from DGAPA-UNAM Grant No. 109913 and CONACYT Project No. 269071. DGAPA-UNAM Grant No. 111017 and CONACYT Project Nos. 269071 and 232608. The authors acknowledge the technical support provided by E. Aparicio, F. Ruiz. M. Ponce, Dr. Katrin Quester, Dr. F. Castillón and Dr. Ruben D. Cadena Nava. The authors are grateful with the facilities provided by Dr. Rosa Mouriño at the Centro de Microscopía Avanzada (CEMIAD) of CICESE in the use of confocal microscopy and Dr. Olga Callejas for her technical assistance in imaging capture. Karla Juarez-Moreno is a member of the International Network of Bionanotechnology with impact in Biomedicine, Food and Biosafety (Funded by CONACYT Project 279889).

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflicts of interest.

Supplementary material

10853_2017_1946_MOESM1_ESM.docx (96 kb)
Supplementary material 1 (DOCX 96 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Centro de Enseñanza Técnica y SuperiorEnsenadaMexico
  2. 2.Center of Nanosciences and NanotechnologyAutonomus National University of MexicoEnsenadaMexico
  3. 3.Centro de Nanociencias y NanotecnologíaUniversidad Nacional Autónoma de MéxicoEnsenadaMexico
  4. 4.Facultad de Ciencias QuímicasUniversidad de ConcepciónConcepciónChile
  5. 5.Departamento de FisicoquímicaCentro de Nanociencias y Nanotecnología UNAMEnsenadaMexico

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