Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells
Abstract Thymidine phosphorylase (TP) is a rate-limiting enzyme in the thymidine catabolic pathway. TP is identical to platelet-derived endothelial cell growth factor and contributes to tumour angiogenesis. TP induces the generation of reactive oxygen species (ROS) and enhances the expression of oxi...
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Nature Portfolio
2018
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oai:doaj.org-article:032a6e04b06a4f58b3f4b74ff4b3e6392021-12-02T11:41:14ZThymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells10.1038/s41598-018-25189-y2045-2322https://doaj.org/article/032a6e04b06a4f58b3f4b74ff4b3e6392018-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25189-yhttps://doaj.org/toc/2045-2322Abstract Thymidine phosphorylase (TP) is a rate-limiting enzyme in the thymidine catabolic pathway. TP is identical to platelet-derived endothelial cell growth factor and contributes to tumour angiogenesis. TP induces the generation of reactive oxygen species (ROS) and enhances the expression of oxidative stress-responsive genes, such as interleukin (IL)-8. However, the mechanism underlying ROS induction by TP remains unclear. In the present study, we demonstrated that TP promotes NADPH oxidase-derived ROS signalling in cancer cells. NADPH oxidase inhibition using apocynin or small interfering RNAs (siRNAs) abrogated the induction of IL-8 and ROS in TP-expressing cancer cells. Meanwhile, thymidine catabolism induced by TP increased the levels of NADPH and intermediates of the pentose phosphate pathway (PPP). Both siRNA knockdown of glucose 6-phosphate dehydrogenase (G6PD), a rate-limiting enzyme in PPP, and a G6PD inhibitor, dihydroepiandrosterone, reduced TP-induced ROS production. siRNA downregulation of 2-deoxy-D-ribose 5-phosphate (DR5P) aldolase, which is needed for DR5P to enter glycolysis, also suppressed the induction of NADPH and IL-8 in TP-expressing cells. These results suggested that TP-mediated thymidine catabolism increases the intracellular NADPH level via the PPP, which enhances the production of ROS by NADPH oxidase and activates its downstream signalling.Sho TabataMasatatsu YamamotoHisatsugu GotoAkiyoshi HirayamaMaki OhishiTakuya KuramotoAtsushi MitsuhashiRyuji IkedaMisako HaraguchiKohichi KawaharaYoshinari ShinsatoKentaro MinamiAtsuro SaijoYuko ToyodaMasaki HanibuchiYasuhiko NishiokaSaburo SoneHiroyasu EsumiMasaru TomitaTomoyoshi SogaTatsuhiko FurukawaShin-ichi AkiyamaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018) |
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Medicine R Science Q Sho Tabata Masatatsu Yamamoto Hisatsugu Goto Akiyoshi Hirayama Maki Ohishi Takuya Kuramoto Atsushi Mitsuhashi Ryuji Ikeda Misako Haraguchi Kohichi Kawahara Yoshinari Shinsato Kentaro Minami Atsuro Saijo Yuko Toyoda Masaki Hanibuchi Yasuhiko Nishioka Saburo Sone Hiroyasu Esumi Masaru Tomita Tomoyoshi Soga Tatsuhiko Furukawa Shin-ichi Akiyama Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells |
| description |
Abstract Thymidine phosphorylase (TP) is a rate-limiting enzyme in the thymidine catabolic pathway. TP is identical to platelet-derived endothelial cell growth factor and contributes to tumour angiogenesis. TP induces the generation of reactive oxygen species (ROS) and enhances the expression of oxidative stress-responsive genes, such as interleukin (IL)-8. However, the mechanism underlying ROS induction by TP remains unclear. In the present study, we demonstrated that TP promotes NADPH oxidase-derived ROS signalling in cancer cells. NADPH oxidase inhibition using apocynin or small interfering RNAs (siRNAs) abrogated the induction of IL-8 and ROS in TP-expressing cancer cells. Meanwhile, thymidine catabolism induced by TP increased the levels of NADPH and intermediates of the pentose phosphate pathway (PPP). Both siRNA knockdown of glucose 6-phosphate dehydrogenase (G6PD), a rate-limiting enzyme in PPP, and a G6PD inhibitor, dihydroepiandrosterone, reduced TP-induced ROS production. siRNA downregulation of 2-deoxy-D-ribose 5-phosphate (DR5P) aldolase, which is needed for DR5P to enter glycolysis, also suppressed the induction of NADPH and IL-8 in TP-expressing cells. These results suggested that TP-mediated thymidine catabolism increases the intracellular NADPH level via the PPP, which enhances the production of ROS by NADPH oxidase and activates its downstream signalling. |
| format |
article |
| author |
Sho Tabata Masatatsu Yamamoto Hisatsugu Goto Akiyoshi Hirayama Maki Ohishi Takuya Kuramoto Atsushi Mitsuhashi Ryuji Ikeda Misako Haraguchi Kohichi Kawahara Yoshinari Shinsato Kentaro Minami Atsuro Saijo Yuko Toyoda Masaki Hanibuchi Yasuhiko Nishioka Saburo Sone Hiroyasu Esumi Masaru Tomita Tomoyoshi Soga Tatsuhiko Furukawa Shin-ichi Akiyama |
| author_facet |
Sho Tabata Masatatsu Yamamoto Hisatsugu Goto Akiyoshi Hirayama Maki Ohishi Takuya Kuramoto Atsushi Mitsuhashi Ryuji Ikeda Misako Haraguchi Kohichi Kawahara Yoshinari Shinsato Kentaro Minami Atsuro Saijo Yuko Toyoda Masaki Hanibuchi Yasuhiko Nishioka Saburo Sone Hiroyasu Esumi Masaru Tomita Tomoyoshi Soga Tatsuhiko Furukawa Shin-ichi Akiyama |
| author_sort |
Sho Tabata |
| title |
Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells |
| title_short |
Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells |
| title_full |
Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells |
| title_fullStr |
Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells |
| title_full_unstemmed |
Thymidine catabolism promotes NADPH oxidase-derived reactive oxygen species (ROS) signalling in KB and yumoto cells |
| title_sort |
thymidine catabolism promotes nadph oxidase-derived reactive oxygen species (ros) signalling in kb and yumoto cells |
| publisher |
Nature Portfolio |
| publishDate |
2018 |
| url |
https://doaj.org/article/032a6e04b06a4f58b3f4b74ff4b3e639 |
| work_keys_str_mv |
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