{"id":4126,"date":"2024-09-23T15:29:19","date_gmt":"2024-09-23T15:29:19","guid":{"rendered":"https:\/\/www.sygnaturediscovery.com\/poster\/radiotherapy-sensitises-preclinical-models-to-dna-damage-response-agents\/"},"modified":"2026-01-22T15:02:48","modified_gmt":"2026-01-22T15:02:48","slug":"radiotherapy-sensitises-preclinical-models-to-dna-damage-response-agents","status":"publish","type":"poster","link":"https:\/\/www.sygnaturediscovery.com\/fr\/poster\/radiotherapy-sensitises-preclinical-models-to-dna-damage-response-agents\/","title":{"rendered":"Radiotherapy sensitises preclinical models to DNA damage response agents"},"content":{"rendered":"<p>Radiotherapy is a key treatment for various cancers often in combination with other therapies.<\/p>\n<p>In this study, we investigated whether radiotherapy enhances the effectiveness of DNA damage response (DDR) agents in the A549 and MDA-MB-436 preclinical xenograft models. Specifically, inhibitors targeting DNA-dependent protein kinase (DNA-PK) or poly-(ADP-ribose)-polymerase (PARP) were used either as monotherapy or in combination with radiotherapy.<\/p>\n<p>The evaluation of monotherapy and combination treatment regimens revealed that A549 and MDA-MB-436 xenograft models exhibit increased sensitivity to DDR agents when exposed to radiotherapy both <em>in vitro<\/em> and <em>in vivo<\/em>.<\/p>\n<p>More specifically:<\/p>\n<ul>\n<li>Combining radiotherapy with DDR inhibitors <em>in vitro<\/em> maintains \u0263H2AX levels in both cell lines and reduces cell proliferation in the A549 cells 48 hours post<\/li>\n<li>Fractionated radiotherapy combined with DDR agents significantly enhances efficacy in both the A549 and MDA-MB-436 xenograft models.<\/li>\n<li>MDA-MB 436 tumours analysed <em>ex vivo<\/em> exhibit elevated \u0263H2AX expression levels in the radiotherapy combination group two weeks after the last dose of radiotherapy.<\/li>\n<\/ul>\n<p>These findings demonstrate that radiotherapy can sensitise preclinical xenograft models to DNA damage response (DDR) agents both <em>in vitro<\/em> and <em>in vivo<\/em>. The data highlight the utility and value of the radiotherapy platform for testing the efficacy of novel therapeutic agents in combination with a clinically relevant standard of care in drug discovery research.<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":2856,"template":"","category":[740,685,738],"class_list":["post-4126","poster","type-poster","status-publish","has-post-thumbnail","hentry","category-ex-vivo-tissue-analysis","category-in-vivo-pharmacology","category-oncology-models"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Radiotherapy sensitises preclinical models to DNA damage response agents - Sygnature<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sygnaturediscovery.com\/fr\/poster\/radiotherapy-sensitises-preclinical-models-to-dna-damage-response-agents\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Radiotherapy sensitises preclinical models to DNA damage response agents - 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