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Open AccessArticle

Tetracycline-Containing MCM-41 Mesoporous Silica Nanoparticles for the Treatment of Escherichia coli

1
Department of Pharmaceutical Sciences, University of North Texas System College of Pharmacy, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX 76107, USA
2
North Texas Eye Research Institute, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX 76107, USA
3
Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE 68178, USA
4
Department of Cell Biology and Immunology, Graduate School of Biomedical Sciences, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX 76107, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work
Academic Editor: Didier Astruc
Molecules 2015, 20(11), 19690-19698; https://doi.org/10.3390/molecules201119650
Received: 14 August 2015 / Revised: 21 October 2015 / Accepted: 22 October 2015 / Published: 30 October 2015
(This article belongs to the Collection Nanomedicine)
Tetracycline (TC) is a well-known broad spectrum antibiotic, which is effective against many Gram positive and Gram negative bacteria. Controlled release nanoparticle formulations of TC have been reported, and could be beneficial for application in the treatment of periodontitis and dental bone infections. Furthermore, TC-controlled transcriptional regulation systems (Tet-on and Tet-off) are useful for controlling transgene expression in vitro and in vivo for biomedical research purposes; controlled TC release systems could be useful here, as well. Mesoporous silica nanomaterials (MSNs) are widely studied for drug delivery applications; Mobile crystalline material 41 (MCM-41), a type of MSN, has a mesoporous structure with pores forming channels in a hexagonal fashion. We prepared 41 ± 4 and 406 ± 55 nm MCM-41 mesoporous silica nanoparticles and loaded TC for controlled dug release; TC content in the TC-MCM-41 nanoparticles was 18.7% and 17.7% w/w, respectively. Release of TC from TC-MCM-41 nanoparticles was then measured in phosphate-buffered saline (PBS), pH 7.2, at 37 °C over a period of 5 h. Most antibiotic was released from both over this observation period; however, the majority of TC was released over the first hour. Efficacy of the TC-MCM-41 nanoparticles was then shown to be superior to free TC against Escherichia coli (E. coli) in culture over a 24 h period, while blank nanoparticles had no effect. View Full-Text
Keywords: tetracycline; MCM-41; E. coli; controlled drug release tetracycline; MCM-41; E. coli; controlled drug release
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Koneru, B.; Shi, Y.; Wang, Y.-C.; Chavala, S.H.; Miller, M.L.; Holbert, B.; Conson, M.; Ni, A.; Di Pasqua, A.J. Tetracycline-Containing MCM-41 Mesoporous Silica Nanoparticles for the Treatment of Escherichia coli. Molecules 2015, 20, 19690-19698.

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