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do Amaral SR, Amantino CF, De Annunzio SR, de Paula AV, Fontana CR, Primo FL. Advanced methylene blue - nanoemulsions for in vitro photodynamic therapy on oral and cervical human carcinoma. Lasers Med Sci 2022; 37:3443-3450. [PMID: 35819661 DOI: 10.1007/s10103-022-03603-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 06/23/2022] [Indexed: 11/28/2022]
Abstract
Photodynamic therapy (PDT) is a therapeutic modality with high contributions in the treatment of cancer. This approach is based on photophysical principles, which presents as a less invasive strategy than conventional therapies. Combined with nanotechnology, the therapy becomes more efficient because nanoparticles (NPs) have advantageous characteristics such as biocompatibility, controlled, and targeted release, promoting solubility and decreasing the toxicity and side effects involved. In this work were developed nanoemulsions containing the methylene blue photosensitizer (MB) (MB/NE) and in the empty form (unloaded/NE). Subsequently, the mentioned nanomaterials were characterized by the measurement of dynamic light scattering (DLS). The MB/NE and unloaded/NE showed appropriate physical and chemical characteristics, with particle size ≤ 200 nm, polydispersity index close to 0.3, and zeta potential exhibiting negative charge, showing stable values during the analysis. The incorporation of the MB did not cause changes in the photophysical profile of the photosensitizer. The quantification performed showed an incorporation rate of 81.9%. Viability studies showed an absence of cytotoxicity for MB/NE in the concentrations of 10-75 µmol·L-1, free MB at the concentration of 75 µmol·L-1, and unloaded NE 47.5% (v/v), presenting viability close to 90%, respectively. PDT in vitro protocols applied to OSCC and HeLa cells showed a decrease in cell viability through only one irradiation, evidencing the photodynamic activity of the formulation when applied to cancer cells. The results obtained were superior to those found in the literature where they use free MB, showing that the association between nanotechnology and PDT optimizes the proposed protocol. From the results obtained, it is possible to indicate that the NE have high stability, with satisfactory physical-chemical parameters, in addition to not presenting cytotoxicity in the tested concentrations, showing their in vitro biocompatibility, in addition to presenting satisfactory effects when combined MB/NE with PDT, showing the potential of MB/NE as a very promising nanostructured photosensitizer for the treatment of some types of cancer.
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Affiliation(s)
- Stéphanie R do Amaral
- School of Pharmaceutical Sciences, Department of Bioprocess and Biotechnology Engineering, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Camila F Amantino
- School of Pharmaceutical Sciences, Department of Bioprocess and Biotechnology Engineering, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Sarah R De Annunzio
- School of Pharmaceutical Sciences, Clinical Analysis Department, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Ariela V de Paula
- School of Pharmaceutical Sciences, Department of Bioprocess and Biotechnology Engineering, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Carla R Fontana
- School of Pharmaceutical Sciences, Clinical Analysis Department, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Fernando L Primo
- School of Pharmaceutical Sciences, Department of Bioprocess and Biotechnology Engineering, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil.
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Ramaye Y, Dabrio M, Roebben G, Kestens V. Development and Validation of Optical Methods for Zeta Potential Determination of Silica and Polystyrene Particles in Aqueous Suspensions. MATERIALS 2021; 14:ma14020290. [PMID: 33429974 PMCID: PMC7827561 DOI: 10.3390/ma14020290] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 12/28/2020] [Accepted: 01/05/2021] [Indexed: 12/19/2022]
Abstract
Zeta potential is frequently used to examine the colloidal stability of particles and macromolecules in liquids. Recently, it has been suggested that zeta potential can also play an important role for grouping and read-across of nanoforms in a regulatory context. Although the measurement of zeta potential is well established, only little information is reported on key metrological principles such as validation and measurement uncertainties. This contribution presents the results of an in-house validation of the commonly used electrophoretic light scattering (ELS) and the relatively new particle tracking analysis (PTA) methods. The performance characteristics were assessed by analyzing silica and polystyrene reference materials. The ELS and PTA methods are robust and have particle mass working ranges of 0.003 mg/kg to 30 g/kg and 0.03 mg/kg to 1.5 mg/kg, respectively. Despite different measurement principles, both methods exhibit similar uncertainties for repeatability (2%), intermediate precision (3%) and trueness (4%). These results confirm that the developed methods can accurately measure the zeta potential of silica and polystyrene particles and can be transferred to other laboratories that analyze similar types of samples. If direct implementation is impossible, the elaborated methodologies may serve as a guide to help laboratories validating their own methods.
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Varenne F, Hillaireau H, Bataille J, Smadja C, Barratt G, Vauthier C. Application of validated protocols to characterize size and zeta potential of dispersed materials using light scattering methods. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.09.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Siemer S, Westmeier D, Barz M, Eckrich J, Wünsch D, Seckert C, Thyssen C, Schilling O, Hasenberg M, Pang C, Docter D, Knauer SK, Stauber RH, Strieth S. Biomolecule-corona formation confers resistance of bacteria to nanoparticle-induced killing: Implications for the design of improved nanoantibiotics. Biomaterials 2018; 192:551-559. [PMID: 30530244 DOI: 10.1016/j.biomaterials.2018.11.028] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 11/07/2018] [Accepted: 11/20/2018] [Indexed: 12/17/2022]
Abstract
Multidrug-resistant bacterial infections are a global health threat. Nanoparticles are thus investigated as novel antibacterial agents for clinical practice, including wound dressings and implants. We report that nanoparticles' bactericidal activity strongly depends on their physical binding to pathogens, including multidrug-resistant primary clinical isolates, such as Staphylococcus aureus, Klebsiella pneumoniae or Enterococcus faecalis. Using controllable nanoparticle models, we found that nanoparticle-pathogen complex formation was enhanced by small nanoparticle size rather than material or charge, and was prevented by 'stealth' modifications. Nanoparticles seem to preferentially bind to Gram-positive pathogens, such as Listeria monocytogenes, S. aureus or Streptococcus pyrogenes, correlating with enhanced antibacterial activity. Bacterial resistance to metal-based nanoparticles was mediated by biomolecule coronas acquired in pathophysiological environments, such as wounds, the lung, or the blood system. Biomolecule corona formation reduced nanoparticles' binding to pathogens, but did not impact nanoparticle dissolution. Our results provide a mechanistic explanation why nano-sized antibiotics may show reduced activity in clinically relevant environments, and may inspire future nanoantibiotic designs with improved and potentially pathogen-specific activity.
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Affiliation(s)
- Svenja Siemer
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany
| | - Dana Westmeier
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany
| | - Matthias Barz
- Institute for Organic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, D-55099, Mainz, Germany
| | - Jonas Eckrich
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany
| | - Désirée Wünsch
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany
| | - Christof Seckert
- Institute for Medical Microbiology and Hygiene, University Medical Center Mainz, Langenbeckstr. 1, 55131 Mainz, Germany
| | - Christian Thyssen
- Biofilm Centre, University Duisburg-Essen, Universitätsstraße 5, 45117, Essen, Germany
| | - Oliver Schilling
- Institute of Institute of Surgical Pathology/Translational Proteomics, University of Freiburg, Breisacher Strasse 115a, 79106, Freiburg, Germany
| | - Mike Hasenberg
- Institute for Experimental Immunology and Imaging, University Hospital, University Duisburg-Essen, Universitätsstraße 2, 45141 Essen, Germany
| | - Chengfang Pang
- Department of Environmental Engineering, Technical University of Denmark, Miljøvej 115, 2800, Kgs. Lyngby, Denmark
| | - Dominic Docter
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany
| | - Shirley K Knauer
- Department of Molecular Biology II, Centre for Medical Biotechnology (ZMB)/CENIDE, University Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany
| | - Roland H Stauber
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany.
| | - Sebastian Strieth
- Department of Nanobiomedicine/ENT, University Medical Center of Mainz, Langenbeckstrasse 1, 55101, Mainz, Germany.
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Bossert D, Crippa F, Petri-Fink A, Balog S. Hypothesis Test of the Photon Count Distribution for Dust Discrimination in Dynamic Light Scattering. Anal Chem 2018; 90:3656-3660. [DOI: 10.1021/acs.analchem.7b04908] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David Bossert
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | - Federica Crippa
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | - Alke Petri-Fink
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
- Chemistry Department, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Sandor Balog
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
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