CAS Key Laboratory of Receptor Research, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
Precise Genome Engineering Center, School of Life Sciences, Guangzhou University, Guangzhou, 510006, China.
Adv Sci (Weinh). 2023 Jun;10(17):e2205818. doi: 10.1002/advs.202205818. Epub 2023 Apr 20.
Herein, we observed that nuclear localization of phosphoglycerate dehydrogenase (PHGDH) is associated with poor prognosis in liver cancer, and Phgdh is required for liver cancer progression in a mouse model. Unexpectedly, impairment of Phgdh enzyme activity exerts a slight effect in a liver cancer model. In liver cancer cells, the aspartate kinase-chorismate mutase-tyrA prephenate dehydrogenase (ACT) domain of PHGDH binds nuclear cMyc to form a transactivation axis, PHGDH/p300/cMyc/AF9, which drives chemokine CXCL1 and IL8 gene expression. Then, CXCL1 and IL8 promote neutrophil recruitment and enhance tumor-associated macrophage (TAM) filtration in the liver, thereby advancing liver cancer. Forced cytosolic localization of PHGDH or destruction of the PHGDH/cMyc interaction abolishes the oncogenic function of nuclear PHGDH. Depletion of neutrophils by neutralizing antibodies greatly hampers TAM filtration. These findings reveal a nonmetabolic role of PHGDH with altered cellular localization and suggest a promising drug target for liver cancer therapy by targeting the nonmetabolic region of PHGDH.
在此,我们观察到磷酸甘油酸脱氢酶(PHGDH)的核定位与肝癌的预后不良有关,并且 Phgdh 在小鼠模型中是肝癌进展所必需的。出乎意料的是,PHGDH 酶活性的损伤在肝癌模型中仅产生轻微的影响。在肝癌细胞中,PHGDH 的天冬氨酸激酶-分支酸变位酶- TyrA 预苯酸脱氢酶(ACT)结构域与核 cMyc 结合形成一个反式激活轴,即 PHGDH/p300/cMyc/AF9,它驱动趋化因子 CXCL1 和 IL8 的基因表达。然后,CXCL1 和 IL8 促进中性粒细胞的募集并增强肝脏中肿瘤相关巨噬细胞(TAM)的滤过,从而促进肝癌的发展。PHGDH 的强制细胞质定位或 PHGDH/cMyc 相互作用的破坏会消除核 PHGDH 的致癌功能。通过中和抗体耗尽中性粒细胞会极大地阻碍 TAM 的滤过。这些发现揭示了 PHGDH 改变细胞定位的非代谢作用,并表明通过靶向 PHGDH 的非代谢区域,针对 PHGDH 可能成为肝癌治疗的有前途的药物靶点。