The Regulation of the Expression of ABCG2 Gene through Mitogen-Activated Protein Kinase Pathways in Canine Lymphoid Tumor Cell Lines
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概要
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Treatments for canine lymphoma often fail because tumor cells acquire multidrug resistance (MDR). MDR can develop through several mechanisms, among which the overexpression of drug transporters in tumor cells is a well-studied mechanism. ATP-binding cassette sub-family G member 2 (ABCG2) belongs to the ABC-transporters, that are representative drug efflux pumps associated with MDR in human tumor cells. However, the regulation of ABCG2 gene expression in canine tumors is not well understood. The purpose of the present study was to reveal the regulatory mechanism of ABCG2 gene expression in 4 canine lymphoid tumor cell lines, GL-1, CLBL-1, UL-1 and Ema. Treatment with phorbol 12-myristate 13-acetate (PMA), the protein kinase C (PKC) activator, stimulated MAPK/ERK pathway in GL-1, UL-1 and Ema cells and JNK pathway in UL-1 and Ema cells. When GL-1 and UL-1 cells were treated with PMA and the MAPK/ERK kinase inhibitor U0126, ABCG2 gene expression levels were elevated above those in untreated cells. Similarly, ABCG2 gene expression increased above control levels in UL-1 and Ema cells treated with PMA and the JNK inhibitor SP600125. However, ABCG2 gene expression was unaffected by U0126 exposure in CLBL-1 cells, in which activation of MAPK/ERK pathway was observed in non-treated cells. These results suggested that MAPK/ERK and JNK pathways downregulate ABCG2 gene expression, which is upregulated by unidentified but possibly PKC-dependent pathways, in several types of canine lymphoid tumor cells.
著者
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TOMIYASU Hirotaka
Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The U
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Goto-Koshino Yuko
Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The U
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Fujino Yasuhito
Department Of Veterinary Internal Medicine Graduate School Of Agricultural And Life Sciences The Uni
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Ohno Koichi
Department Of Chemical Engineering Faculty Of Engineering Niigata University
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Tsujimoto Hajime
Department Of Internal Medicine And Veterinary Hospital Division Of Veterinary Medicine The Universi
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