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- W2913455564 abstract "Abstract Altered branched-chain amino acids (BCAAs) metabolism is a distinctive feature of various cancers and plays an important role in sustaining tumor proliferation and aggressiveness. Despite the therapeutic and diagnostic potentials, the role of BCAA metabolism in cancer and the activities of associated enzymes remain unclear. Due to its pivotal role in BCAA metabolism and rapid cellular transport, hyperpolarized 13 C-labeled α-ketoisocaproate (KIC), the α-keto acid corresponding to leucine, can assess both BCAA aminotransferase (BCAT) and branched-chain α-keto acid dehydrogenase complex (BCKDC) activities via production of [1- 13 C]leucine or 13 CO 2 (and thus H 13 CO 3 − ), respectively. Here, we investigated BCAA metabolism of F98 rat glioma model in vivo using hyperpolarized 13 C-KIC. In tumor regions, we observed a decrease in 13 C-leucine production from injected hyperpolarized 13 C-KIC via BCAT compared to the contralateral normal-appearing brain, and an increase in H 13 CO 3 − , a catabolic product of KIC through the mitochondrial BCKDC. A parallel ex vivo 13 C NMR isotopomer analysis following steady-state infusion of [U- 13 C]leucine to glioma-bearing rats verified the increased oxidation of leucine in glioma tissue. Both the in vivo hyperpolarized KIC imaging and the leucine infusion study indicate that KIC catabolism is upregulated through BCAT/BCKDC and further oxidized via the citric acid cycle in F98 glioma." @default.
- W2913455564 created "2019-02-21" @default.
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- W2913455564 date "2019-01-23" @default.
- W2913455564 modified "2023-10-14" @default.
- W2913455564 title "In vivo assessment of increased oxidation of branched-chain amino acids in glioblastoma" @default.
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- W2913455564 doi "https://doi.org/10.1038/s41598-018-37390-0" @default.
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