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J. Mol. Sci.","IJMS"],"abstract":"<jats:p>Clinical evidence suggests that vitamin C (VitC) may enhance the efficacy of cancer chemotherapy. However, its high oxidating and reducing activity results in low stability in physiological fluids, which may compromise its supportive role in cancer therapies. VitC stability improves when located in a region where water activity is reduced and exposure to a limited amount of ferrous ions. This can be achieved when VitC is encapsulated in liposomes. Here, we present a novel combinatorial effect of a liposomal formulation of vitamin C (LVC, liposomal VitC) and an ataxia-telangiectasia and Rad3-related (ATR) kinase inhibitor (ATRi, ceralasertib) on cancer cells. The cytotoxic effects of vitamin C, LVC and ATRi were evaluated using spectrophotometric and spectrofluorimetric assays, flow cytometry and Western blot. Lipid peroxidation was assessed via fluorescence microscopy and quantified by spectrofluorimetric assays. DNA damage was examined by Western blot. The combination has higher efficacy than ceralasertib alone in genetically diverse ovarian cancer cell lines. LVC offers protective effects when used as an adjuvant during anticancer therapy. We found that the inhibition of the ATR pathway in the presence of LVC results in increased intracellular calcium levels, elevated lipid peroxidation, and higher Fe2+ concentrations. The upregulation of ROS, together with the increased expression of long-chain-fatty-acid\u2014CoA ligase 4 (ACSL4) following co-treatment with ATRi and LVC, indicates the activation of ferroptotic pathways. The formation of DNA double-strand breaks suggests replication fork collapse. Our findings demonstrates that this synthetic targeted therapy, combining a novel liposomal formulation of VitC with an ATR inhibitor, not only enhances DNA damage and the cytotoxic efficacy of ceralasertib but also effectively drives ovarian cancer cells toward cell death.<\/jats:p>","DOI":"10.3390\/ijms27062630","type":"journal-article","created":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T11:12:25Z","timestamp":1773400345000},"page":"2630","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Liposomal Vitamin C as a Modulator of the Efficacy of Ceralasertib Therapy in Ovarian Cancer"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2363-7827","authenticated-orcid":false,"given":"Patrycja","family":"Gralewska-Zaj\u0105c","sequence":"first","affiliation":[{"name":"Department of Medical Biophysics, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, 141\/143 Pomorska Street, 90-236 Lodz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"conceptualization","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-1950-888X","authenticated-orcid":false,"given":"Aleksandra","family":"Przybylska","sequence":"additional","affiliation":[{"name":"Department of Medical Biophysics, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, 141\/143 Pomorska Street, 90-236 Lodz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"given":"Marek","family":"Langner","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Wroclaw University of Science and Technology, 13 Grunwaldzki Square, 50-377 Wroc\u0142aw, Poland"},{"name":"Lipid Systems Ltd., 48C Krzemieniecka Street, 54-613 Wroc\u0142aw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]},{"given":"Magdalena","family":"Przyby\u0142o","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Wroclaw University of Science and Technology, 13 Grunwaldzki Square, 50-377 Wroc\u0142aw, Poland"},{"name":"Lipid Systems Ltd., 48C Krzemieniecka Street, 54-613 Wroc\u0142aw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3439-9032","authenticated-orcid":false,"given":"Agnieszka","family":"Marczak","sequence":"additional","affiliation":[{"name":"Department of Medical Biophysics, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, 141\/143 Pomorska Street, 90-236 Lodz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4170-1693","authenticated-orcid":false,"given":"Aneta","family":"Rogalska","sequence":"additional","affiliation":[{"name":"Department of Medical Biophysics, Institute of Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, 141\/143 Pomorska Street, 90-236 Lodz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,13]]},"reference":[{"key":"ref_1","first-page":"284","article-title":"Ovarian cancer statistics, 2018","volume":"68","author":"Torre","year":"2018","journal-title":"CA Cancer J. 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