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Monteiro MS, Mesquita MS, Garcia LM, Dos Santos PR, de Marangoni de Viveiros CC, da Fonseca RD, Xavier MA, de Mendonça GW, Rosa SS, Silva SL, Paterno LG, Morais PC, Báo SN. Radiofrequency driving antitumor effect of graphene oxide-based nanocomposites: a Hill model analysis. Nanomedicine (Lond) 2024; 19:397-412. [PMID: 38112257 DOI: 10.2217/nnm-2023-0312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023] Open
Abstract
Aim: This report proposes using the Hill model to assess the benchmark dose, the 50% lethal dose, the cooperativity and the dissociation constant while analyzing cell viability data using nanomaterials to evaluate the antitumor potential while combined with radiofrequency therapy. Materials & methods: A nanocomposite was synthesized (graphene oxide-polyethyleneimine-gold) and the viability was evaluated using two tumor cell lines, namely LLC-WRC-256 and B16-F10. Results: Our findings demonstrated that while the nanocomposite is biocompatible against the LLC-WRC-256 and B16-F10 cancer cell lines in the absence of radiofrequency, the application of radiofrequency enhances the cell toxicity by orders of magnitude. Conclusion: This result points to prospective studies with the tested cell lines using tumor animal models.
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Affiliation(s)
- Melissa S Monteiro
- Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | - Marina S Mesquita
- Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | - Leidiane M Garcia
- Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | - Paulo R Dos Santos
- Porto Velho Calama Campus, Federal Institute of Rondônia, Porto Velho, Rondônia, 76820-441, Brazil
| | | | - Ronei D da Fonseca
- PRC/DIMAT, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | - Mary A Xavier
- Faculty of Agronomy & Veterinary, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | | | - Suélia Srf Rosa
- Faculty of Gama, University of Brasília, Brasília, Distrito Federal, 72444-240, Brazil
| | - Saulo Lp Silva
- Institute of Chemistry, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | - Leonardo G Paterno
- Institute of Chemistry, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
| | - Paulo C Morais
- Institute of Physics, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
- Biotechnology & Genomic Sciences, Catholic University of Brasília, Brasília, Distrito Federal, 70790-160, Brazil
| | - Sônia N Báo
- Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil
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Tsukahara A, Yamaguchi T, Tanaka Y, Ueno A. FPGA-Based Processor for Continual Capacitive-Coupling Impedance Spectroscopy and Circuit Parameter Estimation. SENSORS (BASEL, SWITZERLAND) 2022; 22:4406. [PMID: 35746187 PMCID: PMC9228433 DOI: 10.3390/s22124406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 05/30/2022] [Accepted: 06/08/2022] [Indexed: 06/15/2023]
Abstract
In principle, the recently proposed capacitive-coupling impedance spectroscopy (CIS) has the capability to acquire frequency spectra of complex electrical impedance sequentially on a millisecond timescale. Even when the measured object with time-varying unknown resistance Rx is capacitively coupled with the measurement electrodes with time-varying unknown capacitance Cx, CIS can be measured. As a proof of concept, this study aimed to develop a prototype that implemented the novel algorithm of CIS and circuit parameter estimation to verify whether the frequency spectra and circuit parameters could be obtained in milliseconds and whether time-varying impedance could be measured. This study proposes a dedicated processor that was implemented as field-programmable gate arrays to perform CIS, estimate Rx and Cx, and their digital-to-analog conversions at a certain time, and to repeat them continually. The proposed processor executed the entire sequence in the order of milliseconds. Combined with a front-end nonsinusoidal oscillator and interfacing circuits, the processor estimated the fixed Rx and fixed Cx with reasonable accuracy. Additionally, the combined system with the processor succeeded in detecting a quick optical response in the resistance of the cadmium sulfide (CdS) photocell connected in series with a capacitor, and in reading out their resistance and capacitance independently as voltages in real-time.
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Affiliation(s)
- Akihiko Tsukahara
- School of Science and Engineering, Division of Electronic Engineering, Tokyo Denki, Saitama 350-0394, Japan
| | - Tomiharu Yamaguchi
- Department of Electrical and Electronic Engineering, Tokyo Denki University, Tokyo 120-8551, Japan; (T.Y.); (Y.T.); (A.U.)
| | - Yuho Tanaka
- Department of Electrical and Electronic Engineering, Tokyo Denki University, Tokyo 120-8551, Japan; (T.Y.); (Y.T.); (A.U.)
| | - Akinori Ueno
- Department of Electrical and Electronic Engineering, Tokyo Denki University, Tokyo 120-8551, Japan; (T.Y.); (Y.T.); (A.U.)
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Bühler L, Enderle MD, Kahn N, Polke M, Schneider MA, Heußel CP, Herth FJF, Linzenbold W. Establishment of a Tissue-Mimicking Surrogate for Pulmonary Lesions to Improve the Development of RFA Instruments and Algorithms. Biomedicines 2022; 10:biomedicines10051100. [PMID: 35625838 PMCID: PMC9138808 DOI: 10.3390/biomedicines10051100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/05/2022] [Accepted: 05/07/2022] [Indexed: 01/27/2023] Open
Abstract
(1) Development of radiofrequency ablation (RFA) systems for pulmonary lesions is restricted by availability of human tumor specimens and limited comparability of animal tissue. We aimed to develop a new surrogate tissue overcoming these drawbacks. (2) Reference values for electrical impedance in lung tumor tissue were collected during routine lung tumor RFA (n = 10). Subsequently, a tissue-mimicking surrogate with comparable electrical impedance and facilitating detection of the ablation margins was developed. (3) The mean electrical impedance for all patients was 103.5 ± 14.7 Ω. In the optimized surrogate tissue model consisting of 68% agar solution, 23% egg yolk, 9% thermochromic ink, and variable amounts of sodium chloride, the mean electrical impedance was adjustable from 74.3 ± 0.4 Ω to 183.2 ± 5.6 Ω and was a function (y = 368.4x + 175.2; R2 = 0.96; p < 0.001) of sodium chloride concentration (between 0 and 0.3%). The surrogate tissue achieved sufficient dimensional stability, and sample cuts revealed clear margins of color change for temperatures higher 60 °C. (4) The tissue-mimicking surrogate can be adapted to lung tumor with respect to its electrical properties. As the surrogate tissue allows for simple and cost-effective manufacturing, it is suitable for extensive laboratory testing of RFA systems for pulmonary ablation.
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Affiliation(s)
- Louisa Bühler
- Erbe Elektromedizin GmbH, 72072 Tübingen, Germany; (L.B.); (M.D.E.)
| | | | - Nicolas Kahn
- Department of Pneumology and Respiratory Care Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany; (N.K.); (M.P.); (F.J.F.H.)
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
| | - Markus Polke
- Department of Pneumology and Respiratory Care Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany; (N.K.); (M.P.); (F.J.F.H.)
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
| | - Marc A. Schneider
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany
| | - Claus Peter Heußel
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, 69120 Heidelberg, Germany
- Department of Diagnostic and Interventional Radiology with Nuclear Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany
| | - Felix J. F. Herth
- Department of Pneumology and Respiratory Care Medicine, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany; (N.K.); (M.P.); (F.J.F.H.)
- Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), University of Heidelberg, 69120 Heidelberg, Germany; (M.A.S.); (C.P.H.)
| | - Walter Linzenbold
- Erbe Elektromedizin GmbH, 72072 Tübingen, Germany; (L.B.); (M.D.E.)
- Correspondence: ; Tel.: +49-7071-755-2896
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Ashikbayeva Z, Aitkulov A, Atabaev TS, Blanc W, Inglezakis VJ, Tosi D. Green-Synthesized Silver Nanoparticle-Assisted Radiofrequency Ablation for Improved Thermal Treatment Distribution. NANOMATERIALS 2022; 12:nano12030426. [PMID: 35159771 PMCID: PMC8840672 DOI: 10.3390/nano12030426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 01/21/2022] [Accepted: 01/22/2022] [Indexed: 12/21/2022]
Abstract
Thermal ablation therapy is known as an advantageous alternative to surgery allowing the treatment of multiple tumors located in hard-to-reach locations or treating patients with medical conditions that are not compatible with surgery. Appropriate heat propagation and precise control over the heat propagation is considered a weak point of thermal ablation therapy. In this work, silver nanoparticles (AgNPs) are used to improve the heat propagation properties during the thermal ablation procedure. Green-synthesized silver nanoparticles offer several attractive features, such as excellent thermal conductivity, biocompatibility, and antimicrobial activity. A distributed multiplexed fiber optic sensing system is used to monitor precisely the temperature change during nanoparticle-assisted radiofrequency ablation. An array of six MgO-based nanoparticles doped optical fibers spliced to single-mode fibers allowed us to obtain the two-dimensional thermal maps in a real time employing optical backscattering reflectometry at 2 mm resolution and 120 sensing points. The silver nanoparticles at 5, 10, and 20 mg/mL were employed to investigate their heating effects at several positions on the tissue regarding the active electrode. In addition, the pristine tissue and tissue treated with agarose solution were also tested for reference purposes. The results demonstrated that silver nanoparticles could increase the temperature during thermal therapies by propagating the heat. The highest temperature increase was obtained for 5 mg/mL silver nanoparticles introduced to the area close to the electrode with a 102% increase of the ablated area compared to the pristine tissue.
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Affiliation(s)
- Zhannat Ashikbayeva
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave., Nur-Sultan 010000, Kazakhstan;
- Correspondence:
| | - Arman Aitkulov
- Department of Information Engineering, University of Padova, Via Gardenigo 6/A, 35131 Padova, Italy;
| | - Timur Sh. Atabaev
- Department of Chemistry, Nazarbayev University, 53 Kabanbay Batyr Ave., Nur-Sultan 010000, Kazakhstan;
| | - Wilfried Blanc
- Université Côte d’Azur, INPHYNI, UMR7010, CNRS, Parc Valrose, 06108 Nice, France;
| | - Vassilis J. Inglezakis
- Department of Chemical and Process Engineering, University of Strathclyde, 75 Montrose St., Glasgow G1 1XJ, UK;
| | - Daniele Tosi
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave., Nur-Sultan 010000, Kazakhstan;
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Ave., Nur-Sultan 010000, Kazakhstan
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Short-Time Impedance Spectroscopy Using a Mode-Switching Nonsinusoidal Oscillator: Applicability to Biological Tissues and Continuous Measurement. SENSORS 2021; 21:s21216951. [PMID: 34770258 PMCID: PMC8587290 DOI: 10.3390/s21216951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 10/13/2021] [Accepted: 10/18/2021] [Indexed: 01/04/2023]
Abstract
Herein, we propose an impedance spectroscopy method using a mode-switching nonsinusoidal oscillator and apply this method for measuring the impedance of biological tissues and continuous impedance measurement. To obtain impedance spectra over a wide frequency range, we fabricated a novel nonsinusoidal oscillator incorporating binary counters and analog switches. This oscillator could periodically switch oscillation frequency through the mode switching of the feedback resistor. From the oscillation waveform at each oscillation frequency of this circuit (oscillator), we determined the impedance spectrum of a measured object using the discrete-time Fourier transform. Subsequently, we obtained the broad impedance spectrum of the measured object by merging odd-order harmonic spectral components up to the 19th order for each oscillation frequency. From the measured spectrum, the resistive and capacitive components of the circuit simulating bioimpedance were estimated with high accuracy. Moreover, the proposed method was used to measure the impedance of porcine myocardium; changes in the impedance spectrum of the myocardial tissue due to coagulation could be measured. Furthermore, rapid variations in the resistance value of a CdS photocell could be continuously measured using the proposed method.
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