Targeting TLK2 inhibits the progression of gastric cancer by reprogramming amino acid metabolism through the mTOR/ASNS axis

mTORC1型 下调和上调 基因敲除 PI3K/AKT/mTOR通路 癌症研究 泛素连接酶 泛素 化学 生物 细胞生物学 信号转导 生物化学 基因
作者
Mingliang Wang,Jing Li,Xiaodong Yang,Qiang Yan,Huizhen Wang,Xin Xu,Yida Lu,Deguan Li,Yi-Gao Wang,Ruochuan Sun,Shangxin Zhang,Yonghong Zhang,Zhen Zhang,Futao Meng,Yongxiang Li
出处
期刊:Cancer Gene Therapy [Springer Nature]
卷期号:30 (11): 1485-1497 被引量:4
标识
DOI:10.1038/s41417-023-00653-8
摘要

Several recent studies have suggested that TLKs are related to tumor progression. However, the function and mechanism of action of TLK2 in gastric cancer (GC) remain elusive. In this study, TLK2 was found to be significantly upregulated in patients with GC and was identified as an independent prognostic factor for GC. Consistently, TLK2 knockdown markedly reduced the aggressiveness of GC, whereas its overexpression had the opposite effect. IP-MS revealed that the effects of TLK2 on GC were mainly associated with metabolism reprogramming. TLK2 knockdown suppressed amino acid synthesis by downregulating the mTORC1 pathway and ASNS expression in GC cells. Mechanistically, mTORC1 directly interacts with the ASNS protein and inhibits its degradation. Further experiments validated that the ASNS protein was degraded via ubiquitination instead of autophagy. Inhibiting and activating the mTORC1 pathway can upregulate and downregulate ASNS ubiquitination, respectively, and the mTORC1 pathway can reverse the regulatory effects of TLK2 on ASNS. Furthermore, TLK2 was found to regulate the mRNA expression of ASNS. TLK2 directly interacted with ATF4, a transcription factor of ASNS, and promoted its expression. The kinase inhibitor fostamatinib significantly inhibited the proliferative, invasive, and migratory capabilities of GC cells by inhibiting TLK2 activity. Altogether, this study reveals a novel functional relationship between TLK2 and the mTORC1/ASNS axis in GC. Therefore, TLK2 may serve as a potential therapeutic target for GC.
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