7 results on '"CAYRON, Hélène"'
Search Results
2. Siphon-Induced Droplet Break-Off for Enhanced Mixing on a Centrifugal Platform
- Author
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Burger, Robert, primary, Kinahan, David J, additional, Cayron, Hélène, additional, Reis, Nuno, additional, Fonseca, João, additional, and Ducrée, Jens, additional
- Published
- 2019
- Full Text
- View/download PDF
3. A novel 3D microdevice for the in vivo capture of cancer‐associated cells
- Author
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Jiménez‐Zenteno, Alejandro K., primary, Estève, Aurore, additional, Cayron, Hélène, additional, Bou, Elise, additional, Bourrier, David, additional, Sanson, Sylvain, additional, Calise, Denis, additional, Blatché, Charline, additional, Vieu, Christophe, additional, Malavaud, Bernard, additional, and Cerf, Aline, additional
- Published
- 2019
- Full Text
- View/download PDF
4. Siphon-induced droplet break-off for enhanced mixing on a centrifugal platform
- Author
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Burger, Robert, Kinahan, David J., Cayron, Hélène, Reis, Nuno, Fonseca, João, Ducrée, Jens, Burger, Robert, Kinahan, David J., Cayron, Hélène, Reis, Nuno, Fonseca, João, and Ducrée, Jens
- Abstract
We present a powerful and compact batch-mode mixing and dilution technique for centrifugal microfluidic platforms. Siphon structures are designed to discretize continuous flows into a sequence of droplets of volumes as low as 100 nL. Using a passive, self-regulating 4-step mechanism, discrete volumes of two fluids are alternatingly issued into a common intermediate chamber. At its base, a capillary valve acts as a fluidic shift register; a single droplet is held in place while two or more droplets merge and pass through the capillary stop. These merged droplets are advectively mixed as they pass through the capillary valve and into the receiving chamber. Mixing is demonstrated for various combinations of liquids such as aqueous solutions as well as saline solutions and human plasma. The mixing quality is assessed on a quantitative scale by using a colorimetric method based on the mixing of potassium thiocyanate and iron(III) chloride, and in the case of human plasma using a spectroscopic method. For instance, volumes of 5 µL have been mixed in less than 20 s. Single-step dilutions up to 1:5 of plasma in a standard phosphate buffer solution are also demonstrated. This work describes the preliminary development of the mixing method which has since been integrated into a commercially available microfluidic cartridge.
- Published
- 2019
5. Physical approaches for the selection and capture of molecular and cellular biomarkers from a complex fluid
- Author
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CAYRON, Hélène, Équipe Ingénierie pour les sciences du vivant (LAAS-ELIA), Laboratoire d'analyse et d'architecture des systèmes [Toulouse] (LAAS), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UPS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique [Toulouse] (INP)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UPS), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique [Toulouse] (INP), INSA de Toulouse, Christophe Vieu, and Aline Cerf
- Subjects
Biomarqueurs ,Lithographie 3D ,Oncology ,Liquid biopsy ,3D lithography ,Microtechnologies ,Oncologie ,Biopsie liquide ,Capillary assembly ,[SDV.BC]Life Sciences [q-bio]/Cellular Biology ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,Biomarkers ,Assemblage capillaire - Abstract
National audience; This research project focused on two technological approaches emerging from microfabrication for the selection and capture of circulating biomarkers from blood. At the molecular scale, this work was based on the automation of a directed capillary assembly protocol. A dedicated module was implemented into an automate for molecular stampin g and validated using a simple molecular model, allowing the elongation and large-scale assembly of single biomolecules in a controlled and automatized manner. The developed technology was then used for the assembly of relevant molecular biomarkers such as cell -free DNA (cf DNA) from untreated whole blood , evidencing the capabilities of this technology to single out nucleic acids from complex fluids composed of other cellular elements. At the cellular scale, an innovative concept for Circulating Tumor Cell s (CTCs) selection and capture was developed . The developed microdevice is fabricated using 30 direct laser writing and allows for a physical capture of cell s from untreated whole blood while preserving them for further recovery and analysis. After having optimized the design in vitro to maximize the capture efficiency of the system, a selective capture of cancer cell s from untreated whole blood was achieved . A first prototype for the in vivo use of this system was also developed and validated in vitro with cancer cells spiked into culture medium.; Ce travail de thèse s'est axé autour de deux approches technologiques issues du domaine de la microfabrication pour la sélection et la capture de biomarqueurs circulants dans le sang. A l'échelle moléculaire, un module d'assemblage capillaire dirigé a été implémenté dans un automate de tamponnage moléculaire puis validé en utilisant un modèle simple, permettant l'isolement et l'étirement de biomolécules individuelles de manière entièrement contrôlée et automatisée à large échelle. Nous avons ensuite appliqué cette technologie à des biomarqueurs moléculaires d'intérêt tels que les ADN libres contenus dans du sang complet, démontrant la capacité de la technique à isoler des acides nucléiques dans un fluide complexe contenant de nombreux éléments cellulaires . A l'échelle cellulaire, une approche innovante pour la sélection et la capture de Cellules Tumorales Circulantes a été développée. Le microdispositif mis au point est fabriqué par écriture laser à 3 dimensions et permet le piégeage physique de ces cellules dans du sang complet non traité tout en les préservant pour une récupération et analyse ultérieure. Après adaptation du microdispositif pour maximiser son efficacité de capture in vitro, une première preuve de concept de capture sélective de cellules cancéreuses dans du sang complet non traité a été réalisée. U n premier prototype pour une utilisation in vivo a été mi s au point et validé in vitro sur la capture de cellules cancéreuses dans du milieu de culture.
- Published
- 2016
6. 3D-microdevice for the in vivo capture of cancer-associated circulating cells.
- Author
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Cayron, Hélène, primary, Jiménez Zenteno, Alejandro Kayum, additional, Esteve, Aurore, additional, Sanson, Sylvain, additional, Vieu, Christophe, additional, Malavaud, Bernard Andre, additional, and Cerf, Aline, additional
- Published
- 2017
- Full Text
- View/download PDF
7. Microdispositif pour la capture in vivo de biomarqueurs cellulaires circulants
- Author
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Cerf, Aline, SANSON, Sylvain, CAYRON, Hélène, JIMENEZ, Alejandro Kayum, Vieu, Christophe, Malavaud, Bernard, Équipe Ingénierie pour les sciences du vivant (LAAS-ELIA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, CHU Rangueil, Toulouse, France., Institut Universitaire du Cancer de Toulouse - Oncopole (IUCT Oncopole - UMR 1037), CHU Toulouse [Toulouse]-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), ANR-15-CE19-0020,NODENS,Nouveaux Objets triDimensionnels Embarqués pour la Nano-analyse du Sang(2015), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Institut National de la Santé et de la Recherche Médicale (INSERM)
- Subjects
[SPI]Engineering Sciences [physics] ,[SDV]Life Sciences [q-bio] - Abstract
The invention relates to a device (100) for capturing cellular biomarkers circulating in an animal or human biological flow, characterised in that it can be used in vivo and in that it comprises a filtration means (104, 120) provided for retaining said cellular biomarkers, said filtration means comprising at least one through-opening (121) with dimensions suitable for retaining said cellular biomarkers and being rigidly connected to a support (105, 110), the support taking the form of a hollow part.
- Published
- 2015
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