PMID- 24781822 OWN - NLM STAT- MEDLINE DCOM- 20140819 LR - 20211021 IS - 2045-2322 (Electronic) IS - 2045-2322 (Linking) VI - 4 DP - 2014 Apr 30 TI - Role of SLC6A6 in promoting the survival and multidrug resistance of colorectal cancer. PG - 4852 LID - 10.1038/srep04852 [doi] LID - 4852 AB - The treatment of colorectal cancer (CRC) might be improved by the identification of a signalling pathway that could be targeted with novel therapeutics. The results of this study indicate that the taurine transporter SLC6A6 is highly expressed in CRC cells compared with normal colonocytes. SLC6A6 knockdown (KD) attenuated cell survival and was accompanied by enhanced drug sensitivity to 5-fluorouracil (5-FU), doxycycline (DOX) and SN-38. Both the population frequency of the side population (SP) cells and their cancer stem cell (CSC)-like properties (such as tumour initiation, differentiation and chemoresistance) were abrogated by SLC6A6-KD. Conversely, SLC6A6 overexpression increased cell survival and the proportion of SP cells, enhancing multidrug resistance (MDR). Additionally, SLC6A6-siRNA treatment enhanced the cytotoxic effects of all 3 drugs, whereas the efficacy of ABCG2-siRNA treatment was limited to its 2 substrate drugs, DOX and SN-38. This study indicates that SLC6A6 plays an important role in the maintenance of CSC characteristics, thus promoting cell survival signalling and chemoresistance. Therefore, SLC6A6 inhibition may be a promising therapeutic strategy for refractory CRC. FAU - Yasunaga, Masahiro AU - Yasunaga M AD - Division of Developmental Therapeutics, Research Center for Innovative Oncology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan. FAU - Matsumura, Yasuhiro AU - Matsumura Y AD - Division of Developmental Therapeutics, Research Center for Innovative Oncology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba 277-8577, Japan. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20140430 PL - England TA - Sci Rep JT - Scientific reports JID - 101563288 RN - 0 (ABCG2 protein, human) RN - 0 (ATP Binding Cassette Transporter, Subfamily G, Member 2) RN - 0 (ATP-Binding Cassette Transporters) RN - 0 (Membrane Glycoproteins) RN - 0 (Membrane Transport Proteins) RN - 0 (Neoplasm Proteins) RN - 148686-53-7 (taurine transporter) RN - U3P01618RT (Fluorouracil) SB - IM MH - ATP Binding Cassette Transporter, Subfamily G, Member 2 MH - ATP-Binding Cassette Transporters/genetics/metabolism MH - Animals MH - Cell Line, Tumor MH - Cell Survival/genetics MH - Colorectal Neoplasms/*genetics/metabolism/pathology MH - Disease Models, Animal MH - Drug Resistance, Multiple/*genetics MH - Drug Resistance, Neoplasm/*genetics MH - Female MH - Fluorouracil/metabolism/pharmacology MH - Gene Expression MH - Gene Expression Profiling MH - Gene Knockdown Techniques MH - Heterografts MH - Humans MH - Membrane Glycoproteins/*genetics/metabolism MH - Membrane Transport Proteins/*genetics/metabolism MH - Mice MH - Neoplasm Proteins/genetics/metabolism MH - Neoplastic Stem Cells/drug effects/metabolism MH - Phenotype MH - Side-Population Cells/drug effects/metabolism MH - Signal Transduction PMC - PMC4004982 EDAT- 2014/05/02 06:00 MHDA- 2014/08/20 06:00 PMCR- 2014/04/30 CRDT- 2014/05/01 06:00 PHST- 2014/02/07 00:00 [received] PHST- 2014/04/14 00:00 [accepted] PHST- 2014/05/01 06:00 [entrez] PHST- 2014/05/02 06:00 [pubmed] PHST- 2014/08/20 06:00 [medline] PHST- 2014/04/30 00:00 [pmc-release] AID - srep04852 [pii] AID - 10.1038/srep04852 [doi] PST - epublish SO - Sci Rep. 2014 Apr 30;4:4852. doi: 10.1038/srep04852.