Time filter

Source Type

Yanggu, South Korea

Lee H.,Sogang University | Kim J.B.,Real Cosmetic Surgery Clinic | Park S.Y.,Seoul National University | Kim S.-S.,Real Cosmetic Surgery Clinic | Kim H.,Sogang University
Journal of Biomedical Nanotechnology

Cancer recurrence is the main cause of chemotherapeutic treatment failure. The mechanisms driving cancer recurrence may be due to very rare subpopulation cells, cancer stem-like cells (CSCs). Therefore, the early detection and better treatment of cancer stem-like cells are of great interest. In this study, we investigated how to eliminate the side population cells (SP), which have the characteristics of cancer stem-like cells, and also show chemotherapy resistance. Fluorescenceactivated cell sorting (FACS) were used to sort SP and non-SP cells from human liver cancers, Huh-7 Hyaluronic acid (HA), which is an abundant component in the extracellular matrix, is known to involve in proliferation of normal and cancer cells. Herein, we investigated the effect of HA component on chemotherapy against SP cells. Cell growth inhibitory effects of the paclitaxel (PTX) chemotherapy combined with the HA component on SP cells of Huh-7 was determined using the trypan blue dye exclusion test. PTX combined with HA was found to show more increased inhibition of cell growth in both SP and non-SP cells, compared to free PTX treatment. In conclusion, SP cells of Huh-7 shows chemotherapeutic drug resistance due to the over-expressed efflux pumps. HA proposed one of possibilities to overcome the limitation of chemotherapy against cancer stem-like cells. Copyright © 2013 American Scientific Publishers All rights reserved. Source

Sung J.H.,Seoul National University | Kim J.B.,Real Cosmetic Surgery Clinic | Park S.H.,Korea University | Park S.Y.,Seoul National University | And 3 more authors.
Journal of the Korean Society for Applied Biological Chemistry

Berberine has been reported to inhibit tumor growth in lung cancer. Thus, the effects of berberine on cancer cells as well as the cancer stem cell (side population; SP) fraction were investigated in the H460 lung cancer cell line, and the effects of berberine treatment on cell growth, cell cycle, and cell death were evaluated. Changes in the SP fraction were examined after treatment with berberine, 5-fluorouracil (5-FU), and co-treatment. Berberine inhibited cancer cell growth in a dose-dependent manner. Treatment of the cells with berberine resulted in a 4% increase in cell death and an 8% increase in the number of cells of G0/G1 phase, compared to the untreated control. To examine the relationship between berberine and cancer stem cells, the SP fraction was analyzed. Surprisingly, the SP cell fraction was increased upon berberine treatment and further increased after cotreatment with 5-FU. These results are in contrast to the study of Kim et al. (2008) with MCF-7 breast cancer cells, in which berberine inhibited the growth of both cancer cells and the corresponding cancer stem cells. Results of the present study suggest that berberine should be used with caution in the treatment of various cancers, despite its positive effect on cancer cell growth inhibition. © 2012 The Korean Society for Applied Biological Chemistry. Source

Lee H.,Sogang University | Park S.,Sogang University | Kim J.B.,Real Cosmetic Surgery Clinic | Kim J.,Sogang University | Kim H.,Sogang University
Cancer Letters

Metastasized and chemoresistant secondary breast cancer treatment commonly shows very low efficacy. A new efficient treatment method is required to overcome the limitation against the secondary breast cancer. In this study, anoikis-resistant breast cancer cells, MDA-MB-231 and MCF-7 were developed as models of chemoresistant and metastatic breast cancer. Doxorubicin encapsulating human serum albumin nanoparticles (HSA. +. DOX NPs) were fabricated to confirm the benefits of nanoparticles at the treatment of anoikis-resistant breast cancer cells. The side population (SP) fraction in the anoikis-resistant cancer cells was higher than the parental cells. HSA. +. DOX NPs were more cytotoxic to anoikis-resistant cancer cells than free doxorubicin. The confocal microscope images demonstrated HSA. +. DOX NPs to deliver more doxorubicin into cells compared to the free doxorubicin by bypassing the drug efflux pump systems of anoikis-resistant cancer cells. In this study, a nanomedicine-based drug delivery carrier shows a potential in treating a metastasized and chemoresistant breast cancer. © 2013 Elsevier Ireland Ltd. Source

Discover hidden collaborations