Abstract:
:Under hypoxia, most of glucose is converted to secretory lactate, which leads to the overuse of glutamine-carbon. However, under such a condition how glutamine nitrogen is disposed to avoid over-accumulating ammonia remains to be determined. Here we identify a metabolic flux of glutamine to secretory dihydroorotate, which is indispensable to glutamine-carbon metabolism under hypoxia. We found that glutamine nitrogen is necessary to nucleotide biosynthesis, but enriched in dihyroorotate and orotate rather than processing to its downstream uridine monophosphate under hypoxia. Dihyroorotate, not orotate, is then secreted out of cells. Furthermore, we found that the specific metabolic pathway occurs in vivo and is required for tumor growth. The identified metabolic pathway renders glutamine mainly to acetyl coenzyme A for lipogenesis, with the rest carbon and nitrogen being safely removed. Therefore, our results reveal how glutamine carbon and nitrogen are coordinatively metabolized under hypoxia, and provide a comprehensive understanding on glutamine metabolism.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Wang Y,Bai C,Ruan Y,Liu M,Chu Q,Qiu L,Yang C,Li Bdoi
10.1038/s41467-018-08033-9subject
Has Abstractpub_date
2019-01-14 00:00:00pages
201issue
1issn
2041-1723pii
10.1038/s41467-018-08033-9journal_volume
10pub_type
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