Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency
Despite the use of therapeutic ultrasound in the treatment of soft tissue pathologies, there remains some controversy regarding its efficacy. In order to develop new treatment protocols, it is a common practice to carry out in vitro studies in cell cultures before conducting animal tests. The lack o...
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doaj-34d3d4cfc385481684bdd6e0c6db12752021-08-06T15:31:15ZengMDPI AGSensors1424-82202021-07-01215040504010.3390/s21155040Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition FrequencySilvia Ronda Peñacoba0Mar Fernández Gutiérrez1Julio San Román del Barrio2Francisco Montero de Espinosa3ITEFI-CSIC, Institute of Physics and Communication Technologies, 28006 Madrid, SpainICTP-CSIC, Institute of Polymer Science and Technology, 28006 Madrid, SpainICTP-CSIC, Institute of Polymer Science and Technology, 28006 Madrid, SpainITEFI-CSIC, Institute of Physics and Communication Technologies, 28006 Madrid, SpainDespite the use of therapeutic ultrasound in the treatment of soft tissue pathologies, there remains some controversy regarding its efficacy. In order to develop new treatment protocols, it is a common practice to carry out in vitro studies in cell cultures before conducting animal tests. The lack of reproducibility of the experimental results observed in the literature concerning in vitro experiments motivated us to establish a methodology for characterizing the acoustic field in culture plate wells. In this work, such acoustic fields are fully characterized in a real experimental configuration, with the transducer being placed in contact with the surface of a standard 12-well culture plate. To study the non-thermal effects of ultrasound on fibroblasts, two different treatment protocols are proposed: long pulse (200 cycles) signals, which give rise to a standing wave in the well with the presence of cavitation (I<sub>SPTP</sub> <sub>max</sub> = 19.25 W/cm<sup>2</sup>), and a short pulse (five cycles) of high acoustic pressure, which produces a number of echoes in the cavity (I<sub>SPTP</sub> = 33.1 W/cm<sup>2</sup>, with P<sub>max</sub> = 1.01 MPa). The influence of the acoustic intensity, the number of pulses, and the pulse repetition frequency was studied. We further analyzed the correlation of these acoustic parameters with cell viability, population, occupied surface, and cell morphology. Lytic effects when cavitation was present, as well as mechanotransduction reactions, were observed.https://www.mdpi.com/1424-8220/21/15/5040ultrasoundcell mechanotransductionfibroblasts culture |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Silvia Ronda Peñacoba Mar Fernández Gutiérrez Julio San Román del Barrio Francisco Montero de Espinosa |
spellingShingle |
Silvia Ronda Peñacoba Mar Fernández Gutiérrez Julio San Román del Barrio Francisco Montero de Espinosa Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency Sensors ultrasound cell mechanotransduction fibroblasts culture |
author_facet |
Silvia Ronda Peñacoba Mar Fernández Gutiérrez Julio San Román del Barrio Francisco Montero de Espinosa |
author_sort |
Silvia Ronda Peñacoba |
title |
Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency |
title_short |
Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency |
title_full |
Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency |
title_fullStr |
Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency |
title_full_unstemmed |
Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency |
title_sort |
effects of non-thermal ultrasound on a fibroblast monolayer culture: influence of pulse number and pulse repetition frequency |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2021-07-01 |
description |
Despite the use of therapeutic ultrasound in the treatment of soft tissue pathologies, there remains some controversy regarding its efficacy. In order to develop new treatment protocols, it is a common practice to carry out in vitro studies in cell cultures before conducting animal tests. The lack of reproducibility of the experimental results observed in the literature concerning in vitro experiments motivated us to establish a methodology for characterizing the acoustic field in culture plate wells. In this work, such acoustic fields are fully characterized in a real experimental configuration, with the transducer being placed in contact with the surface of a standard 12-well culture plate. To study the non-thermal effects of ultrasound on fibroblasts, two different treatment protocols are proposed: long pulse (200 cycles) signals, which give rise to a standing wave in the well with the presence of cavitation (I<sub>SPTP</sub> <sub>max</sub> = 19.25 W/cm<sup>2</sup>), and a short pulse (five cycles) of high acoustic pressure, which produces a number of echoes in the cavity (I<sub>SPTP</sub> = 33.1 W/cm<sup>2</sup>, with P<sub>max</sub> = 1.01 MPa). The influence of the acoustic intensity, the number of pulses, and the pulse repetition frequency was studied. We further analyzed the correlation of these acoustic parameters with cell viability, population, occupied surface, and cell morphology. Lytic effects when cavitation was present, as well as mechanotransduction reactions, were observed. |
topic |
ultrasound cell mechanotransduction fibroblasts culture |
url |
https://www.mdpi.com/1424-8220/21/15/5040 |
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