Metabolic shift to serine biosynthesis through 3-PG accumulation and PHGDH induction promotes tumor growth in pancreatic cancer

被引：27

作者：

Itoyama, Rumi ^{[1
,2
]}

Yasuda-Yoshihara, Noriko ^{[1
,2
]}

Kitamura, Fumimasa ^{[1
,2
]}

Yasuda, Tadahito ^{[1
,2
]}

Bu, Luke ^{[1
,2
]}

Yonemura, Atsuko ^{[1
,2
]}

Uchihara, Tomoyuki ^{[1
,2
]}

Arima, Kota ^{[1
,2
]}

Hu, Xichen ^{[1
,2
]}

Jun, Zhang ^{[1
,2
]}

Okamoto, Yuya ^{[1
,2
]}

Akiyama, Takahiko ^{[1
,2
]}

Yamashita, Kohei ^{[1
]}

Nakao, Yosuke ^{[1
]}

Yusa, Toshihiko ^{[1
]}

Kitano, Yuki ^{[1
]}

Higashi, Takaaki ^{[1
]}

Miyata, Tatsunori ^{[1
]}

Imai, Katsunori ^{[1
]}

Hayashi, Hiromitsu ^{[1
]}

Yamashita, Yo-ichi ^{[1
]}

Mikawa, Takumi ^{[3
]}

Kondoh, Hiroshi ^{[3
]}

Baba, Hideo ^{[1
]}

Ishimoto, Takatsugu ^{[1
,2
]}

机构：

[1] Kumamoto Univ, Grad Sch Med Sci, Dept Gastroenterol Surg, Kumamoto, Japan

[2] Kumamoto Univ, Int Res Ctr Med Sci IRCMS, Gastrointestinal Canc Biol, Kumamoto, Japan

[3] Kyoto Univ, Grad Sch Med, Geriatr Unit, Sakyo Ku, Kyoto, Japan

来源：

CANCER LETTERS | 2021年 / 523卷

基金：

日本学术振兴会;

关键词：

Cancer metabolism; Pancreatic cancer; Serine biosynthesis; Glycolysis; Nutrient microenvironment; PROLIFERATION; CONTRIBUTES; GLYCINE; PATHWAY; ENZYMES; FLUX;

D O I：

10.1016/j.canlet.2021.09.007

中图分类号：

R73 [肿瘤学];

学科分类号：

100214 ;

摘要：

Cancer cells craftily adapt their energy metabolism to their microenvironment. Nutrient deprivation due to hypovascularity and fibrosis is a major characteristic of pancreatic ductal adenocarcinoma (PDAC); thus, PDAC cells must produce energy intrinsically. However, the enhancement of energy production via activating Kras mutations is insufficient to explain the metabolic rewiring of PDAC cells. Here, we investigated the molecular mechanism underlying the metabolic shift in PDAC cells under serine starvation. Amino acid analysis revealed that the concentrations of all essential amino acids and most nonessential amino acids were decreased in the blood of PDAC patients. In addition, the plasma serine concentration was significantly higher in PDAC patients with PHGDH-high tumors than in those with PHGDH-low tumors. Although the growth and tumorigenesis of PK59 cells with PHGDH promoter hypermethylation were significantly decreased by serine starvation, these activities were maintained in PDAC cell lines with PHGDH promoter hypomethylation by serine biosynthesis through PHGDH induction. In fact, DNA methylation analysis by pyrosequencing revealed that the methylation status of the PHGDH promoter was inversely correlated with the PHGDH expression level in human PDAC tissues. In addition to PHGDH induction by serine starvation, PDAC cells showed enhanced serine biosynthesis under serine starvation through 3-PG accumulation via PGAM1 knockdown, resulting in enhanced PDAC cell growth and tumor growth. However, PHGDH knockdown efficiently suppressed PDAC cell growth and tumor growth under serine starvation. These findings provide evidence that targeting the serine biosynthesis pathway by inhibiting PHGDH is a potent therapeutic approach to eliminate PDAC cells in nutrient-deprived microenvironments.

引用

页码：29 / 42

页数：14

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