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The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells

BACKGROUND: 5FU can be converted to its active metabolite fluoro-deoxyuridine monophosphate (FdUMP) through two pathways: the orotate phosphoribosyl transferase–ribonucleotide reductase (OPRT–RR) pathway and the thymidine phosphorylase–thymidine kinase (TP–TK) pathway. We investigated the mechanism...

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Autores principales: Mori, Ryutaro, Yoshida, Kazuhiro, Futamura, Manabu, Suetsugu, Tomonari, Shizu, Kaoru, Tanahashi, Toshiyuki, Tanaka, Yoshihiro, Matsuhashi, Nobuhisha, Yamaguchi, Kazuya
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Singapore 2018
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6476841/
https://www.ncbi.nlm.nih.gov/pubmed/30276573
http://dx.doi.org/10.1007/s10120-018-0881-3
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author Mori, Ryutaro
Yoshida, Kazuhiro
Futamura, Manabu
Suetsugu, Tomonari
Shizu, Kaoru
Tanahashi, Toshiyuki
Tanaka, Yoshihiro
Matsuhashi, Nobuhisha
Yamaguchi, Kazuya
author_facet Mori, Ryutaro
Yoshida, Kazuhiro
Futamura, Manabu
Suetsugu, Tomonari
Shizu, Kaoru
Tanahashi, Toshiyuki
Tanaka, Yoshihiro
Matsuhashi, Nobuhisha
Yamaguchi, Kazuya
author_sort Mori, Ryutaro
collection PubMed
description BACKGROUND: 5FU can be converted to its active metabolite fluoro-deoxyuridine monophosphate (FdUMP) through two pathways: the orotate phosphoribosyl transferase–ribonucleotide reductase (OPRT–RR) pathway and the thymidine phosphorylase–thymidine kinase (TP–TK) pathway. We investigated the mechanism underlying 5FU-resistance, focusing on the changes in the 5FU metabolisms. METHODS: MKN45 and 5FU-resistant MKN45/F2R cells were treated with 5FU or fluoro-deoxyuridine (FdU) in combination with hydroxyurea (HU) or tipiracil (TPI). The amount of FdUMP was determined by the density of the upper band of thymidylate synthase on Western blotting. RESULTS: The MKN45/F2R cells exhibited 5FU resistance (37.1-fold) and showed decreased OPRT and increased TP levels. In both cells, the FdUMP after treatment with 5FU was decreased when RR was inhibited by HU but not when TP was inhibited by TPI. A metabolome analysis revealed the loss of intracellular deoxyribose 1-phosphate (dR1P) in both cells, indicating that FdUMP was synthesized from 5FU only through the OPRT–RR pathway because of the loss of dR1P. After the knockdown of TK, the FdUMP after treatment with FdU was decreased in MKN45 cells. However, it was not changed in MKN45/F2R cells. Furthermore, TP inhibition caused an increase in FdUMP after treatment with 5FU or FdU and reversed the 5FU resistance in MKN45/F2R cells, indicating that FdUMP was reduced through the TP–TK pathway in MKN45/F2R cells. CONCLUSIONS: In MKN45/F2R cells, the reduction of FdUMP through the TP–TK pathway caused 5FU resistance, and the inhibition of TP reversed the resistance to 5FU, suggesting that the combination of 5FU and TPI is a promising cancer therapy.
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spelling pubmed-64768412019-05-14 The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells Mori, Ryutaro Yoshida, Kazuhiro Futamura, Manabu Suetsugu, Tomonari Shizu, Kaoru Tanahashi, Toshiyuki Tanaka, Yoshihiro Matsuhashi, Nobuhisha Yamaguchi, Kazuya Gastric Cancer Original Article BACKGROUND: 5FU can be converted to its active metabolite fluoro-deoxyuridine monophosphate (FdUMP) through two pathways: the orotate phosphoribosyl transferase–ribonucleotide reductase (OPRT–RR) pathway and the thymidine phosphorylase–thymidine kinase (TP–TK) pathway. We investigated the mechanism underlying 5FU-resistance, focusing on the changes in the 5FU metabolisms. METHODS: MKN45 and 5FU-resistant MKN45/F2R cells were treated with 5FU or fluoro-deoxyuridine (FdU) in combination with hydroxyurea (HU) or tipiracil (TPI). The amount of FdUMP was determined by the density of the upper band of thymidylate synthase on Western blotting. RESULTS: The MKN45/F2R cells exhibited 5FU resistance (37.1-fold) and showed decreased OPRT and increased TP levels. In both cells, the FdUMP after treatment with 5FU was decreased when RR was inhibited by HU but not when TP was inhibited by TPI. A metabolome analysis revealed the loss of intracellular deoxyribose 1-phosphate (dR1P) in both cells, indicating that FdUMP was synthesized from 5FU only through the OPRT–RR pathway because of the loss of dR1P. After the knockdown of TK, the FdUMP after treatment with FdU was decreased in MKN45 cells. However, it was not changed in MKN45/F2R cells. Furthermore, TP inhibition caused an increase in FdUMP after treatment with 5FU or FdU and reversed the 5FU resistance in MKN45/F2R cells, indicating that FdUMP was reduced through the TP–TK pathway in MKN45/F2R cells. CONCLUSIONS: In MKN45/F2R cells, the reduction of FdUMP through the TP–TK pathway caused 5FU resistance, and the inhibition of TP reversed the resistance to 5FU, suggesting that the combination of 5FU and TPI is a promising cancer therapy. Springer Singapore 2018-10-01 2019 /pmc/articles/PMC6476841/ /pubmed/30276573 http://dx.doi.org/10.1007/s10120-018-0881-3 Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Original Article
Mori, Ryutaro
Yoshida, Kazuhiro
Futamura, Manabu
Suetsugu, Tomonari
Shizu, Kaoru
Tanahashi, Toshiyuki
Tanaka, Yoshihiro
Matsuhashi, Nobuhisha
Yamaguchi, Kazuya
The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells
title The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells
title_full The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells
title_fullStr The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells
title_full_unstemmed The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells
title_short The inhibition of thymidine phosphorylase can reverse acquired 5FU-resistance in gastric cancer cells
title_sort inhibition of thymidine phosphorylase can reverse acquired 5fu-resistance in gastric cancer cells
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6476841/
https://www.ncbi.nlm.nih.gov/pubmed/30276573
http://dx.doi.org/10.1007/s10120-018-0881-3
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