Abstract:
:Advanced Bladder Cancer (BLCA) remains a clinical challenge that lacks effective therapeutic measures. Here, we show that distinct, stage-wise metabolic alterations in BLCA are associated with the loss of function of aldehyde oxidase (AOX1). AOX1 associated metabolites have a high predictive value for advanced BLCA and our findings demonstrate that AOX1 is epigenetically silenced during BLCA progression by the methyltransferase activity of EZH2. Knockdown (KD) of AOX1 in normal bladder epithelial cells re-wires the tryptophan-kynurenine pathway resulting in elevated NADP levels which may increase metabolic flux through the pentose phosphate (PPP) pathway, enabling increased nucleotide synthesis, and promoting cell invasion. Inhibition of NADP synthesis rescues the metabolic effects of AOX1 KD. Ectopic AOX1 expression decreases NADP production, PPP flux and nucleotide synthesis, while decreasing invasion in cell line models and suppressing growth in tumor xenografts. Further gain and loss of AOX1 confirm the EZH2-dependent activation, metabolic deregulation, and tumor growth in BLCA. Our findings highlight the therapeutic potential of AOX1 and provide a basis for the development of prognostic markers for advanced BLCA.
journal_name
Oncogenejournal_title
Oncogeneauthors
Vantaku V,Putluri V,Bader DA,Maity S,Ma J,Arnold JM,Rajapakshe K,Donepudi SR,von Rundstedt FC,Devarakonda V,Dubrulle J,Karanam B,McGuire SE,Stossi F,Jain AK,Coarfa C,Cao Q,Sikora AG,Villanueva H,Kavuri SM,Lotan Ydoi
10.1038/s41388-019-0902-7subject
Has Abstractpub_date
2020-10-01 00:00:00pages
6265-6285issue
40eissn
0950-9232issn
1476-5594pii
10.1038/s41388-019-0902-7journal_volume
39pub_type
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