{"id":31497,"date":"2025-04-15T15:27:46","date_gmt":"2025-04-15T15:27:46","guid":{"rendered":"https:\/\/amelie-project.eu\/?post_type=publication&#038;p=31497"},"modified":"2025-12-17T16:46:58","modified_gmt":"2025-12-17T16:46:58","slug":"des-microspheres-visibles-au-ct-permettent-le-suivi-in-vivo-du-corps-entier-des-echafaudages-injectables-dingenierie-tissulaire","status":"publish","type":"publication","link":"https:\/\/amelie-project.eu\/fr\/publication\/des-microspheres-visibles-au-ct-permettent-le-suivi-in-vivo-du-corps-entier-des-echafaudages-injectables-dingenierie-tissulaire\/","title":{"rendered":"Des microsph\u00e8res visibles par tomodensitom\u00e9trie permettent le suivi in vivo du corps entier des \u00e9chafaudages injectables d'ing\u00e9nierie tissulaire"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.21.0&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; width=&#8221;100%&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.21.0&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;]<!-- divi:paragraph --><\/p>\n<p><strong>Annalisa Bettini, Peter Stephen Patrick, Richard M. Day, Daniel J. Stuckey.<\/strong><\/p>\n<p>Advanced Healthcare Materials. 2024;13(17).<\/p>\n<p><em>R\u00e9sum\u00e9<\/em><\/p>\n<p>Cette \u00e9tude a permis de mettre au point de minuscules billes en forme d'\u00e9ponge (appel\u00e9es microporteurs) qui peuvent transporter des cellules th\u00e9rapeutiques et, surtout, \u00eatre clairement visibles sur les examens d'imagerie m\u00e9dicale. Les chercheurs ont ajout\u00e9 un produit de contraste inoffensif, le sulfate de baryum, afin que les billes apparaissent sur les tomodensitogrammes apr\u00e8s avoir \u00e9t\u00e9 inject\u00e9es dans le corps. Les m\u00e9decins peuvent ainsi savoir o\u00f9 va le mat\u00e9riel implant\u00e9, combien de temps il reste en place et si les cellules transplant\u00e9es restent vivantes. Lors de tests en laboratoire et d'\u00e9tudes sur des animaux, les billes se sont r\u00e9v\u00e9l\u00e9es s\u00fbres, ont permis la croissance de cellules et sont rest\u00e9es visibles sur les scanners pendant au moins deux semaines. Les microsph\u00e8res pourraient \u00e9galement \u00eatre administr\u00e9es par des injections peu invasives, y compris dans le c\u0153ur. Dans l'ensemble, cette technologie pourrait contribuer \u00e0 am\u00e9liorer les th\u00e9rapies r\u00e9g\u00e9n\u00e9ratives en garantissant que les \u00e9chafaudages porteurs de cellules implant\u00e9es atteignent le bon endroit et y restent, tout en donnant aux m\u00e9decins un moyen de suivre le traitement en temps r\u00e9el.<\/p>\n<p><em>R\u00e9sum\u00e9<\/em><\/p>\n<p><span style=\"font-size: 18px;\">La d\u00e9livrance et la r\u00e9tention cibl\u00e9es sont des exigences essentielles pour les produits implantables issus de l'ing\u00e9nierie tissulaire. Les m\u00e9thodes d'imagerie non invasives qui peuvent confirmer la localisation, la r\u00e9tention et la biodistribution des cellules transplant\u00e9es attach\u00e9es aux \u00e9chafaudages d'ing\u00e9nierie tissulaire implant\u00e9s seront inestimables pour l'optimisation et l'am\u00e9lioration des th\u00e9rapies r\u00e9g\u00e9n\u00e9ratives. Pour r\u00e9pondre \u00e0 ce besoin, un \u00e9chafaudage injectable d'ing\u00e9nierie tissulaire compos\u00e9 de microsph\u00e8res tr\u00e8s poreuses compatibles avec la transplantation de cellules est modifi\u00e9 pour contenir l'agent de contraste de la tomographie assist\u00e9e par ordinateur (CT), le sulfate de baryum (BaSO4). Les microsph\u00e8res tra\u00e7ables pr\u00e9sentent une forte absorption des rayons X, le contraste permettant le suivi du corps entier. Les microsph\u00e8res sont cellularis\u00e9es avec des cellules souches m\u00e9senchymateuses GFP+ Luciferase+ et pr\u00e9sentent une biocompatibilit\u00e9 in vitro. In vivo, les microsph\u00e8res cellularis\u00e9es charg\u00e9es de BaSO4 sont introduites dans le membre post\u00e9rieur de souris o\u00f9 elles restent viables pendant 14 jours. L'enregistrement conjoint de l'imagerie 3D par bioluminescence et des reconstructions \u00b5CT permet d'\u00e9valuer le mat\u00e9riau de l'\u00e9chafaudage et la colocalisation des cellules. Les microsph\u00e8res tra\u00e7ables sont \u00e9galement compatibles avec une administration mini-invasive par injections intramyocardiques transthoraciques guid\u00e9es par ultrasons chez les rats. Ces r\u00e9sultats sugg\u00e8rent que les microsph\u00e8res charg\u00e9es de BaSO4 peuvent \u00eatre utilis\u00e9es comme un nouvel outil pour optimiser les techniques d'administration et suivre la persistance et la distribution des mat\u00e9riaux d'\u00e9chafaudage implant\u00e9s. En outre, les microsph\u00e8res peuvent \u00eatre cellularis\u00e9es et ont le potentiel d'\u00eatre d\u00e9velopp\u00e9es en un produit combin\u00e9 injectable d'ing\u00e9nierie tissulaire pour la r\u00e9g\u00e9n\u00e9ration cardiaque.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><!-- \/divi:paragraph --><\/p>\n<p>Acc\u00e9der \u00e0 l'article complet ici :<\/p>\n<p><a href=\"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/full\/10.1002\/adhm.202303588\">https:\/\/advanced.onlinelibrary.wiley.com\/doi\/full\/10.1002\/adhm.202303588<\/a>\u00a0<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><!-- \/divi:paragraph -->[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>","protected":false},"excerpt":{"rendered":"<p>Annalisa Bettini, Peter Stephen Patrick, Richard M. Day, Daniel J. Stuckey. Advanced Healthcare Materials. 2024;13(17). Summary This study developed tiny sponge-like beads (called microcarriers) that can carry therapeutic cells and, importantly, can be seen clearly on medical imaging scans. The researchers added a harmless contrast material, barium sulphate, so the beads show up on computed tomography (CT) scans after they are injected into the body. This makes it possible for doctors to track where the implanted material goes, how long it stays in place, and whether the transplanted cells remain alive. In laboratory tests and in animal studies, the beads were safe, allowed cells to grow on them, and stayed visible on scans for at least two weeks. The microspheres could also be delivered through minimally invasive injections, including into the heart. Overall, this technology could help improve regenerative therapies by ensuring that implanted cell-carrying scaffolds reach the right location and stay there \u2013 while giving doctors a way to monitor the treatment in real time. Abstract Targeted delivery and retention are essential requirements for implantable tissue-engineered products. Non-invasive imaging methods that can confirm location, retention, and biodistribution of transplanted cells attached to implanted tissue engineering scaffolds will be invaluable [&hellip;]<\/p>","protected":false},"featured_media":31499,"template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"<!-- wp:paragraph -->\n<p>Charlotte Desprez, Davide Danovi, Charles H Knowles and Richard M Day.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>J. Tissue Eng. 2023;14:1\u201318.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><em>Abstract<\/em><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Skeletal muscle-derived cells (SMDC) hold tremendous potential for replenishing dysfunctional muscle lost due to disease or trauma. Current therapeutic usage of SMDC relies on harvesting autologous cells from muscle biopsies that are subsequently expanded in vitro before re-implantation into the patient. Heterogeneity can arise from multiple factors including quality of the starting biopsy, age and comorbidity affecting the processed SMDC. Quality attributes intended for clinical use often focus on minimum levels of myogenic cell marker expression. Such approaches do not evaluate the likelihood of SMDC to differentiate and form myofibres when implanted in vivo, which ultimately determines the likelihood of muscle regeneration. Predicting the therapeutic potency of SMDC in vitro prior to implantation is key to developing successful therapeutics in regenerative medicine and reducing implementation costs. Here, we report on the development of a novel SMDC profiling tool to examine populations of cells in vitro derived from different donors. We developed an image-based pipeline to quantify morphological features and extracted cell shape descriptors. We investigated whether these could predict heterogeneity in the formation of myotubes and correlate with the myogenic fusion index. Several of the early cell shape characteristics were found to negatively correlate with the fusion index. These included total area occupied by cells, area shape, bounding box area, compactness, equivalent diameter, minimum ferret diameter, minor axis length and perimeter of SMDC at 24 h after initiating culture. The information extracted with our approach indicates live cell imaging can detect a range of cell phenotypes based on cell-shape alone and preserving cell integrity could be used to predict propensity to form myotubes in vitro and functional tissue in vivo.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Access the full paper here:&nbsp;<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/36949843\/\">https:\/\/pubmed.ncbi.nlm.nih.gov\/36949843\/<\/a><\/p>\n<!-- \/wp:paragraph -->","_et_gb_content_width":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_links_to":"","_links_to_target":""},"categories":[43],"class_list":["post-31497","publication","type-publication","status-publish","has-post-thumbnail","hentry","category-publication"],"_links":{"self":[{"href":"https:\/\/amelie-project.eu\/fr\/wp-json\/wp\/v2\/publication\/31497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/amelie-project.eu\/fr\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/amelie-project.eu\/fr\/wp-json\/wp\/v2\/types\/publication"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/amelie-project.eu\/fr\/wp-json\/wp\/v2\/media\/31499"}],"wp:attachment":[{"href":"https:\/\/amelie-project.eu\/fr\/wp-json\/wp\/v2\/media?parent=31497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/amelie-project.eu\/fr\/wp-json\/wp\/v2\/categories?post=31497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}