{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T04:52:25Z","timestamp":1787892745702,"version":"build-2784847793"},"reference-count":64,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T00:00:00Z","timestamp":1729641600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Research Foundation of Korea (NRF)","award":["2018R1D1A3B05041889"],"award-info":[{"award-number":["2018R1D1A3B05041889"]}]},{"name":"National Research Foundation of Korea (NRF)","award":["RS-2023-00240942"],"award-info":[{"award-number":["RS-2023-00240942"]}]},{"name":"National Research Foundation of Korea (NRF)","award":["RS-2024-00462450"],"award-info":[{"award-number":["RS-2024-00462450"]}]},{"name":"National Research Foundation of Korea (NRF)","award":["NRF-2022R1I1A1A01065276"],"award-info":[{"award-number":["NRF-2022R1I1A1A01065276"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Emerging evidence suggests that cancer stemness plays a crucial role in tumor progression, metastasis, and chemoresistance. Upon exposure to internal or external stress, ribosomes stand sentinel and facilitate diverse biological processes, including oncological responses. In the present study, ribosome-inactivating stress (RIS) was evaluated for its modulation of cancer cell stemness as a pivotal factor of tumor cell reprogramming. Based on the concept of stress-responsive cancer cell stemness, we addressed human intestinal cancer cell line-based off-the-shelf spheroid cultures. Intestinal cancer cell line-based spheroids exhibited heightened levels of CD44+CD133+ cancer stemness, which was improved by chemical-induced RIS. Further evaluations revealed the potential of these stress-imprinted spheroids as a platform for chemoresistance screening. Compared to adherent cells, stemness-improved spheroid cultures displayed reduced apoptosis in response to 5-fluorouracil (5-FU), a frontline chemotherapeutic agent against colorectal cancer. Moreover, serial subcultures with repeated RIS exposure maintained and even enhanced cancer stemness and chemoresistance patterns. In particular, isolated CD44+CD133+ cancer stem cells exhibited higher chemoresistance compared to unsorted cells. To elucidate the mechanisms underlying RIS-induced stemness, RNA-seq analysis identified Wnt signaling pathways and stemness-associated signals as notable features in spheroids exposed to RIS. Loss-of-function studies targeting connective tissue growth factor (CTGF), a negative regulator of Wnt signaling, revealed that CTGF-deficient spheroids exhibited improved cancer stemness and resistance to 5-FU, with RIS further enhancing these effects. In conclusion, this proof-of-concept study demonstrates the feasibility of leveraging stress-responsive cancer stemness for the development of spheroid-based platforms for chemoresistance evaluation and elucidation of pathophysiological processes of colorectal tumorigenesis under environmental stress.<\/jats:p>","DOI":"10.3390\/ijms252111383","type":"journal-article","created":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T06:00:52Z","timestamp":1729663252000},"page":"11383","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Leveraging Xenobiotic-Responsive Cancer Stemness in Cell Line-Based Tumoroids for Evaluating Chemoresistance: A Proof-of-Concept Study on Environmental Susceptibility"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2364-5875","authenticated-orcid":false,"given":"Ki-Hyung","family":"Kim","sequence":"first","affiliation":[{"name":"Laboratory of Mucosal Exposome and Biomodulation, Department of Integrative Biomedical Sciences, Pusan National University, Yangsan 50612, Republic of Korea"},{"name":"Department of Obstetrics and Gynecology, College of Medicine, Pusan National University, Busan 49241, Republic of Korea"},{"name":"Biomedical Research Institute, Pusan National University, Busan 49241, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seung Joon","family":"Lee","sequence":"additional","affiliation":[{"name":"Laboratory of Mucosal Exposome and Biomodulation, Department of Integrative Biomedical Sciences, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juil","family":"Kim","sequence":"additional","affiliation":[{"name":"Laboratory of Mucosal Exposome and Biomodulation, Department of Integrative Biomedical Sciences, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8686-8166","authenticated-orcid":false,"given":"Yuseok","family":"Moon","sequence":"additional","affiliation":[{"name":"Laboratory of Mucosal Exposome and Biomodulation, Department of Integrative Biomedical Sciences, Pusan National University, Yangsan 50612, Republic of Korea"},{"name":"Biomedical Research Institute, Pusan National University, Busan 49241, Republic of Korea"},{"name":"Graduate Program of Genomic Data Sciences, Pusan National University, Yangsan 50612, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,10,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Abbas, Z.N., Al-Saffar, A.Z., Jasim, S.M., and Sulaiman, G.M. 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