Abstract
The vitamin E analog α-tocopheryl succinate (α-TOS) selectively induces apoptosis in several cancer cells, but it is sensitive to esterases present in cervical cancer cells. Magnetite nanoparticles (Nps) were prepared by a reduction–coprecipitation method; their surface was silanized and conjugated to α-TOS to enhance its resistance. Morphology, size, and crystal structure were analyzed by scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction. Chemical composition was analyzed by energy-dispersive X-ray spectroscopy; functional groups were determined by Fourier transform infrared spectroscopy; and α-TOS content was estimated by thermogravimetric analysis. The cytotoxic activity of α-TOS-Nps was evaluated in non-malignant fibroblasts and cervical cancer cells by means of the colorimetric MTT viability test. Intracellular localization was identified by confocal laser scanning microscopy. Characterization of α-TOS-Nps revealed sphere-like Nps with 15 nm average size, formed by mineral and organic constituents with high stability. α-TOS-Nps were internalized in the nucleus and selectively affected the viability of cervical cancer cells in a dose- and time-dependent manner but were biocompatible with non-malignant fibroblasts. In conclusion, functionalization of magnetite Nps protected the cytotoxic activity of α-TOS in non-sensitive cervical cancer cells.
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Acknowledgments
Authors are grateful to Francisco Ruiz for TEM support, Ma. Iracema Valeriano Arreola and Fidel Pacheco for TGA analysis, personal from CIBIOR for technical assistance. This study was supported by the SEP-CONACYT (Fondo de Investigación Científica Básica) Grant No. 154602. CIBIOR was supported by funds from the Mexican Institute for Social Security (CTFIS/10RD/12/2011). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Angulo-Molina, A., Méndez-Rojas, M.Á., Palacios-Hernández, T. et al. Magnetite nanoparticles functionalized with α-tocopheryl succinate (α-TOS) promote selective cervical cancer cell death. J Nanopart Res 16, 2528 (2014). https://doi.org/10.1007/s11051-014-2528-6
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DOI: https://doi.org/10.1007/s11051-014-2528-6