Correction: Oh et al. Enhanced Effect of Polyethyleneimine-Modified Graphene Oxide and Simvastatin on Osteogenic Differentiation of Murine Bone Marrow-Derived Mesenchymal Stem Cells. Biomedicines 2021, 9, 501

Addition of an Author

Jeong-Sun Park was not included as an author in the original publication [1]. The corrected Author Contributions Statement appears here.

Author Contributions: Conceptualization, E.-J.L.; methodology, E.-J.L. and J.-S.O.; investigation, E.-J.L., J.-S.P. and J.-S.O.; validation, J.-S.P. and J.-S.O.; writing—original draft preparation, E.-J.L. and J.-S.O.; writing—review and editing, E.-J.L. and J.-S.O.; supervision, E.-J.L.; project administration, E.-J.L.; funding acquisition, E.-J.L. All authors have read and agreed to the published version of the manuscript.

Missing Citation

In the original publication [1], Park (2018) was not cited. The citation has now been inserted in the legends of figures and references’ order has also been adjusted.

29.

Park, J.-S. Carbon-Based Graphene as a Drug Carrier for Use in Tissue Engineering. Master’s Thesis, Dankook University, Cheonan, Korea, 8 January 2018. (In Korean)

Figure Legend

In the original publication [1], there was a mistake in the legends of all figures. This study is based on Jeong-Sun Park’s Master thesis [29], so the Master thesis has to be cited in the legends of those figures.

Figure 1. Schematic representation of the formation of polyethyleneimine-modified graphene oxide/simvastatin complexes. EDC: ethyl (dimethylaminopropyl) carbodiimide; NHS: N-hydroxysuccinimide. Modified from [29].

Figure 2. Fourier transform infrared spectrum of graphene oxide (GO), polyethyleneimine (PEI), and GO-PEI product. Modified from [29].

Figure 3. The electrical characteristics of graphene oxide (GO), GO-polyethyleneimine (GP), simvastatin (Sim), and GP/Sim (GS1–GS4) measured with zeta potential. Modified from [29].

Figure 4. In vitro cell test results. Cell attachment revealed by CLSM (A). Proliferation of MSCs for 7 days of culturing (B). CLSM images were taken at 100× magnification. Error bars represent +/− standard deviations (n ≥ 3). *** p < 0.001. Modified from [29].

Figure 5. Alkaline phosphatase activity of mesenchymal stem cells on graphene oxide–polyethyleneimine–simvastatin complexes with different simvastatin content after 7 days and 14 days of culturing. Error bars represent +/− standard deviations (n ≥ 3). *** p < 0.001. Modified from [29].

Figure 6. Alizarin Red S assay result for mesenchymal stem cells after 21 days of culturing. Error bars represent +/− standard deviations (n ≥ 3). ** p < 0.01. Modified from [29].

Figure 7. Real-time polymerase chain reaction following in vitro mesenchymal stem cell culturing with culture plate (control), and concentration of graphene oxide–polyethyleneimine–simvastatin complex treatment after 7 and 14 days of culturing. Early marker runt-related transcription factor 2 (A) and late markers osteopontin (B) and osteocalcin (C). Error bars represent +/− standard deviations (n ≥ 3). ** p < 0.01 and *** p < 0.001. Modified from [29].

The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.