Branched-chain amino acids sustain pancreatic cancer growth by regulating lipid metabolism
이지현, 조용락, 김지혜, 김종욱, Nam Hae-Yun, 김승후, 손재경,
소속 상세정보
이지현 ( Lee Ji-Hyeon )
University of Ulsan College of Medicine Asan Medical Center Department of Biomedical Sciences
조용락 ( Cho Young-Rak )
University of Ulsan College of Medicine Asan Medical Center Department of Biomedical Sciences
김지혜 ( Kim Ji-Hye )
University of Ulsan College of Medicine Asan Medical Center Department of Biomedical Sciences
김종욱 ( Kim Jong-Wook )
University of Ulsan College of Medicine Asan Medical Center Department of Biomedical Sciences
( Nam Hae-Yun )
University of Ulsan College of Medicine Asan Medical Center Department of Biochemistry and Molecular Biology
김승후 ( Kim Seong-Who )
University of Ulsan College of Medicine Asan Medical Center Department of Biochemistry and Molecular Biology
손재경 ( Son Jae-Kyoung )
University of Ulsan College of Medicine Asan Medical Center Department of Biomedical Sciences
Abstract
Branched-chain amino acid (BCAA) catabolism and high levels of enzymes in the BCAA metabolic pathway have recently been shown to be associated with cancer growth and survival. However, the precise roles of BCAA metabolism in cancer growth and survival remain largely unclear. Here, we found that BCAA metabolism has an important role in human pancreatic ductal adenocarcinoma (PDAC) growth by regulating lipogenesis. Compared with nontransformed human pancreatic ductal (HPDE) cells, PDAC cells exhibited significantly elevated BCAA uptake through solute carrier transporters, which were highly upregulated in pancreatic tumor tissues compared with normal tissues. Branched-chain amino-acid transaminase 2 (BCAT2) knockdown markedly impaired PDAC cell proliferation, but not HPDE cell proliferation, without significant alterations in glutamate or reactive oxygen species levels. Furthermore, PDAC cell proliferation, but not HPDE cell proliferation, was substantially inhibited upon knockdown of branched-chain α-keto acid dehydrogenase a (BCKDHA). Interestingly, BCKDHA knockdown had no significant effect on mitochondrial metabolism; that is, neither the level of tricarboxylic acid cycle intermediates nor the oxygen consumption rate was affected. However, BCKDHA knockdown significantly inhibited fatty-acid synthesis, indicating that PDAC cells may utilize BCAAs as a carbon source for fatty-acid biosynthesis. Overall, our findings show that the BCAA metabolic pathway may provide a novel therapeutic target for pancreatic cancer.
키워드
Cancer; Cell growth
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SCI(E)
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KoreaMed
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