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Non-nuclear localization of Ki-67 in human colorectal cancer cells grown as multicellular layers

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Abstract

Multicellular layers (MCL) of cancer cells is an in vitro 3-dimensional (3D) model that mimics avascular microregions of human solid tumors and has been shown to be useful in pharmacokinetic–pharmacodynamic studies of anticancer agents. We investigated whether Ki-67, which is widely used as a proliferation marker, can be used to evaluate changes in proliferative fractions following drug exposure in MCL of HT-29 human colorectal cancer cells. Ki-67 expression was monitored and compared between cancer cells cultured as monolayers or MCL. Drug distribution and Ki-67 expression were evaluated within MCL following exposure to doxorubicin and paclitaxel. Ki-67 expression was observed in the nuclei of proliferating cells in monolayers, tumor xenograft, and multicellular spheroids. In MCL, however, Ki-67 expression was detected in the membrane/cytoplasm as well as in the nucleus throughout MCL. Neither the location nor the level of expression changed following drug exposure, whereas drug-induced apoptosis increased. Our data show that membranous/cytoplasmic Ki-67 may not be valid as a marker for the proliferative activity of cells grown as MCL. Studies for non-nuclear localization and its mechanism in 3D in vitro models of other cell lines are warranted.

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Acknowledgments

This work was supported by Mid-career Researcher Program through NRF Grant funded by the MEST (No. 2012R1A2A2A01003361) and the Nano-Biotechnology Project (Regenomics, 2011-0007745) of the Korean Science and Engineering Foundation (KOSEF). Yu-Jin Kim was sponsored by the Ministry of Knowledge Economy (MKE) and Korea Industrial Technology Foundation (KOTEF) through the Human Resource Training Project for Strategic Technology

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Correspondence to Hyo-Jeong Kuh.

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Kim, YJ., Lee, SH., Lee, J. et al. Non-nuclear localization of Ki-67 in human colorectal cancer cells grown as multicellular layers. Arch. Pharm. Res. 36, 634–640 (2013). https://doi.org/10.1007/s12272-013-0061-2

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  • DOI: https://doi.org/10.1007/s12272-013-0061-2

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