| Anticancer effect of SN-38 on colon cancer cell lines with different metastatic potential. | |
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MedLine Citation:
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PMID: 18497955 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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SN-38 is an active metabolite of the topoisomerase I inhibitor irinotecan. The mechanism behind its antitumor effect in colorectal cancer is not fully understood. In this study, we examined the response of colon cancer cell lines with different metastatic potential to SN-38. The parental human colon cancer cell line KM12C and its two highly metastatic derivatives KM12SM and KM12L4a were cultivated in 5% CO2 at 37 degrees C for 24 h and then exposed to SN-38 (2.5 microg/ml) at 37 degrees C for 4, 24 and 48 h, respectively. The cell cycle was measured by flow cytometry, apoptotic activity was determined by flow cytometry and immunocytochemistry and the expression of topoisomerase I, Bax and survivin proteins were examined by Western blot. The exposure of the cells to SN-38 induced S-phase and G2 arrest (P<0.0001) and the KM12L4a cells had the highest response in a time-dependent manner (P<0.0001). The rates of apoptosis in the KM12SM (P=0.001) and KM12L4a cell lines (P=0.01) were increased time-dependently, though there was no such change in the KM12C cells. The expression of topoisomerase I protein was decreased in each cell line tested and the expression of Bax protein was increased, especially in KM12L4a. In conclusion, the effect of SN-38 on the colon cancer cell lines was mediated via conducting S-phase and G2 arrest and apoptosis. This effect was found in the cell lines with higher metastatic potentials, indicating that SN-38 can be used to treat advanced colon cancers. |
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Authors:
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Asa Wallin; Joar Svanvik; Birgitta Holmlund; Lillianne Ferreud; Xiao-Feng Sun |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Oncology reports Volume: 19 ISSN: 1021-335X ISO Abbreviation: Oncol. Rep. Publication Date: 2008 Jun |
Date Detail:
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Created Date: 2008-05-23 Completed Date: 2008-08-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9422756 Medline TA: Oncol Rep Country: Greece |
Other Details:
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Languages: eng Pagination: 1493-8 Citation Subset: IM |
Affiliation:
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KEF, Faculty of Health Sciences, University Hospital, Linköping, Sweden. asawa@ibk.liu.se |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Antineoplastic Agents, Phytogenic
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pharmacology* Apoptosis / drug effects* Blotting, Western Camptothecin / analogs & derivatives*, pharmacology Cell Proliferation / drug effects* Colonic Neoplasms / drug therapy*, metabolism, secondary* DNA Topoisomerases, Type I / antagonists & inhibitors, metabolism Flow Cytometry G2 Phase / drug effects Humans Immunoenzyme Techniques Microtubule-Associated Proteins / metabolism Neoplasm Proteins / metabolism S Phase / drug effects Tumor Cells, Cultured bcl-2-Associated X Protein / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Antineoplastic Agents, Phytogenic; 0/BAX protein, human; 0/BIRC5 protein, human; 0/Microtubule-Associated Proteins; 0/Neoplasm Proteins; 0/bcl-2-Associated X Protein; 100286-90-6/irinotecan; 7689-03-4/Camptothecin; EC 5.99.1.2/DNA Topoisomerases, Type I |
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