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In vitro and in vivo effects of graphene oxide and reduced graphene oxide on glioblastoma

Authors Jaworski S, Sawosz E, Kutwin M, Wierzbicki M, Hinzmann M, Grodzik M, Winnicka A, Lipińska L, Włodyga K, Chwalibog A

Received 16 November 2014

Accepted for publication 20 December 2014

Published 25 February 2015 Volume 2015:10(1) Pages 1585—1596

DOI https://doi.org/10.2147/IJN.S77591

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Dr Thomas J Webster

Sławomir Jaworski,1 Ewa Sawosz,1 Marta Kutwin,1 Mateusz Wierzbicki,1 Mateusz Hinzmann,1 Marta Grodzik,1 Anna Winnicka,2 Ludwika Lipinska,3 Karolina Włodyga,1 Andrè Chwalibog4

1Warsaw University of Life Science, Faculty of Animal Science, Division of Biotechnology and Biochemistry of Nutrition, 2Department of Pathology and Veterinary Diagnostics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, 3Institute of Electronic Materials Technology, Warsaw, Poland; 4University of Copenhagen, Department of Veterinary Clinical and Animal Sciences, Copenhagen, Denmark

Abstract: Graphene and its related counterparts are considered the future of advanced nanomaterials owing to their exemplary properties. However, information about their toxicity and biocompatibility is limited. The objective of this study is to evaluate the toxicity of graphene oxide (GO) and reduced graphene oxide (rGO) platelets, using U87 and U118 glioma cell lines for an in vitro model and U87 tumors cultured on chicken embryo chorioallantoic membrane for an in vivo model. The in vitro investigation consisted of structural analysis of GO and rGO platelets using transmission elec­tron microscopy, evaluation of cell morphology and ultrastructure, assessment of cell viability by XTT assay, and investigation of cell proliferation by BrdU assay. Toxicity in U87 glioma tumors was evaluated by calculation of weight and volume of tumors and analyses of ultrastructure, histology, and protein expression. The in vitro results indicate that GO and rGO enter glioma cells and have different cytotoxicity. Both types of platelets reduced cell viability and proliferation with increasing doses, but rGO was more toxic than GO. The mass and volume of tumors were reduced in vivo after injection of GO and rGO. Moreover, the level of apoptotic markers increased in rGO-treated tumors. We show that rGO induces cell death mostly through apoptosis, indicating the potential applicability of graphene in cancer therapy.

Keywords: graphene oxide, reduced graphene oxide, toxicity, glioma, apoptosis

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