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Contribution à la modélisation d’interface biologique par spectroscopie d’impédance : application au suivi de l’épithélium pigmenté de la rétine durant sa croissance et face à diverses perturbations

Abstract : This manuscript focuses on studying the interface between an electrode and epithelial cells of the retina: the Retinal Pigment Epithelium (RPE). The cells that are part of this epithelium develops until they form a monolayer of juxtaposed cells with close lateral contact involving the presence of tight junctions. A damaged epithelium is often associated with sight alterations.Impedance spectroscopy is a measurement method that allows to study materials containing both conducting and dielectric elements in a non–destructive way. We apply this technique to the RPE cells layer. Cells membranes are the dielectric part while the intra and extracellular mediums are the conductive parts of this material. In a first stage one can measure the impedance at a fixed frequency as a way to follow tissues development. As an example, the 1 KHz frequency is often considered in characterizing electrodes from implanted devices. One can also measure the impedance over a wider bandwidth and apply an electric model circuit to the data. The extracted parameters can give a better interpretation of the state of the cell layer. In this work, two part will be mainly investigated. First we will evaluate the use of a constant phase element in part of the electrical model describing the cell layer. Second, and considering the same model, we will observe the reaction of the model when the cells are subject to various perturbations
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https://tel.archives-ouvertes.fr/tel-02482728
Contributor : Abes Star :  Contact
Submitted on : Tuesday, February 18, 2020 - 11:57:15 AM
Last modification on : Tuesday, June 2, 2020 - 7:36:04 AM

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  • HAL Id : tel-02482728, version 2

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Jocelyn Boutzen. Contribution à la modélisation d’interface biologique par spectroscopie d’impédance : application au suivi de l’épithélium pigmenté de la rétine durant sa croissance et face à diverses perturbations. Optique / photonique. Université Paris-Est, 2019. Français. ⟨NNT : 2019PESC2044⟩. ⟨tel-02482728v2⟩

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