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4 results on '"Valentin Gensbittel"'

1. Platelets favor the outgrowth of established metastases

Author

Maria J. Garcia-Leon, Cristina Liboni, Vincent Mittelheisser, Louis Bochler, Gautier Follain, Clarisse Mouriaux, Ignacio Busnelli, Annabel Larnicol, Florent Colin, Marina Peralta, Naël Osmani, Valentin Gensbittel, Catherine Bourdon, Rafael Samaniego, Angélique Pichot, Nicodème Paul, Anne Molitor, Raphaël Carapito, Martine Jandrot-Perrus, Olivier Lefebvre, Pierre H. Mangin, and Jacky G. Goetz

Subjects
Science
Abstract

Abstract Despite abundant evidence demonstrating that platelets foster metastasis, anti-platelet agents have low therapeutic potential due to the risk of hemorrhages. In addition, whether platelets can regulate metastasis at the late stages of the disease remains unknown. In this study, we subject syngeneic models of metastasis to various thrombocytopenic regimes to show that platelets provide a biphasic contribution to metastasis. While potent intravascular binding of platelets to tumor cells efficiently promotes metastasis, platelets further support the outgrowth of established metastases via immune suppression. Genetic depletion and pharmacological targeting of the glycoprotein VI (GPVI) platelet-specific receptor in humanized mouse models efficiently reduce the growth of established metastases, independently of active platelet binding to tumor cells in the bloodstream. Our study demonstrates therapeutic efficacy when targeting animals bearing growing metastases. It further identifies GPVI as a molecular target whose inhibition can impair metastasis without inducing collateral hemostatic perturbations.

Published
2024
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2. Impairing flow-mediated endothelial remodeling reduces extravasation of tumor cells

Author

Gautier Follain, Naël Osmani, Valentin Gensbittel, Nandini Asokan, Annabel Larnicol, Luc Mercier, Maria Jesus Garcia-Leon, Ignacio Busnelli, Angelique Pichot, Nicodème Paul, Raphaël Carapito, Seiamak Bahram, Olivier Lefebvre, and Jacky G. Goetz

Subjects
Medicine, Science
Abstract

Abstract Tumor progression and metastatic dissemination are driven by cell-intrinsic and biomechanical cues that favor the growth of life-threatening secondary tumors. We recently identified pro-metastatic vascular regions with blood flow profiles that are permissive for the arrest of circulating tumor cells. We have further established that such flow profiles also control endothelial remodeling, which favors extravasation of arrested CTCs. Yet, how shear forces control endothelial remodeling is unknown. In the present work, we aimed at dissecting the cellular and molecular mechanisms driving blood flow-dependent endothelial remodeling. Transcriptomic analysis of endothelial cells revealed that blood flow enhanced VEGFR signaling, among others. Using a combination of in vitro microfluidics and intravital imaging in zebrafish embryos, we now demonstrate that the early flow-driven endothelial response can be prevented upon specific inhibition of VEGFR tyrosine kinase and subsequent signaling. Inhibitory targeting of VEGFRs reduced endothelial remodeling and subsequent metastatic extravasation. These results confirm the importance of VEGFR-dependent endothelial remodeling as a driving force of CTC extravasation and metastatic dissemination. Furthermore, the present work suggests that therapies targeting endothelial remodeling might be a relevant clinical strategy in order to impede metastatic progression.

Published
2021
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4. Near infra-red light responsive carbon nanotubes@mesoporous silica for photothermia and drug delivery to cancer cells

Author

Sylvie Begin-Colin, C.J.R. Wells, Damien Mertz, Valentin Gensbittel, O. Bringel, Jacky G. Goetz, B. Li, Sébastien Harlepp, Mariana Tasso, Dominique Begin, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Institut de chimie et procédés pour l'énergie, l'environnement et la santé (ICPEES), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg (UNISTRA), Universidad Nacional de la Plata [Argentine] (UNLP), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Mertz, Damien, Immuno-Rhumatologie Moléculaire, Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM), and Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Polymers and Plastics, [CHIM.THER] Chemical Sciences/Medicinal Chemistry, Nanotechnology, [SDV.CAN]Life Sciences [q-bio]/Cancer, 02 engineering and technology, Carbon nanotube, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, 010402 general chemistry, 01 natural sciences, Catalysis, law.invention, Nanomaterials, Biomaterials, Colloid and Surface Chemistry, [SDV.CAN] Life Sciences [q-bio]/Cancer, law, Materials Chemistry, medicine, Doxorubicin, Mesoporous Silica Coatings, [CHIM.MATE] Chemical Sciences/Material chemistry, Nanocomposite, Chemistry, technology, industry, and agriculture, Nanocomposite Hydrogels, [CHIM.MATE]Chemical Sciences/Material chemistry, Mesoporous silica, Photothermal therapy, Phototherapy, [SDV.SP]Life Sciences [q-bio]/Pharmaceutical sciences, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Cancer Cells, [SDV.SP] Life Sciences [q-bio]/Pharmaceutical sciences, Drug delivery, Nanomedicine, NIR-Light Induced Drug Delivery, Carbon Nanotubes, [CHIM.OTHE]Chemical Sciences/Other, 0210 nano-technology, medicine.drug
Abstract

Among smart activable nanomaterials used for nanomedicine applications, carbon-based nano composites are well known to ensure phototherapy while their use for controlled drug delivery is still rarely investigated. In this work, original hybrid mesoporous silica (MS)-coated carbon nanotubes (CNTs) nanoplatforms have been designed to provide phototherapy combined with drug release mediated by NIR laser excitation. The responsive CNT@MS are chemically modified with original isobutyramide (IBAM) grafts acting as non-covalent binders, which ensure a very high drug loading capacity (>to 80 wt%) of the antitumor drug doxorubicin (DOX) as well as the final adsorption of a human serum albumin (HSA) shell as biocompatible interface and drug gate-keeping. The drug is demonstrated to unbind from the nanocomposite only upon photothermal excitation and to release in the solution. Such smart platforms are further shown to deliver drug upon several pulsatile NIR excitations with controlled temperature profiles. Regarding antitumor action, we demonstrate here that the NIR light induced photothermic effect from the nanocomposites is the main effect accounting for cancer cell toxicity and that DOX delivery mediated by the NIR light brings an additional toxicity allowing a synergistic effect to efficiently kill tumor cells. Finally, when our nanocomposites are embedded within a hydrogel mimicking extracellular matrix, the resulting smart responsive scaffolds efficiently release DOX upon NIR light to the cells localized above the composite hydrogel. These results demonstrate that such nanocomposites are highly promising as new components of implantable antitumor scaffolds that are able to respond to external stimuli in time and location for a better disease management. (c) 2020 Elsevier Ltd. All rights reserved.

Published
2020
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