2. Academic Validation
  3. TOPK inhibits autophagy by phosphorylating ULK1 and promotes glioma resistance to TMZ

TOPK inhibits autophagy by phosphorylating ULK1 and promotes glioma resistance to TMZ

  • Cell Death Dis. 2019 Aug 5;10(8):583. doi: 10.1038/s41419-019-1805-9.
Hui Lu 1,  Juanjuan Xiao 1,  Changshu Ke 2,  Xiaofang Ni 1,  Ruijuan Xiu 1,  Qin Tian 1,  Huaxiong Pan 3,  Ling Zou 1,  Fei Wang 1,  Tengfei Ma 1,  Xinying Ji 4,  Ping Yuan 1,  Lin Liu 1,  Jianmin Zhang 1,  Wei Jia 5,  Qiuhong Duan 6,  Feng Zhu 7
Affiliations

Affiliations

  • 1 Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, 430030, Wuhan, Hubei, PR China.
  • 2 Department of Pathology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 430030, Wuhan, Hubei, PR China.
  • 3 Department of Pathology, Union Hospital, Huazhong University of Science and Technology, 430030, Wuhan, Hubei, PR China.
  • 4 Henan International Joint Laboratory of Nuclear Protein Regulation, Henan University Medical Center (HUMC), 475004, Kaifeng, Henan, PR China.
  • 5 Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, 430030, Wuhan, Hubei, PR China. jiaw005@gmail.com.
  • 6 Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, 430030, Wuhan, Hubei, PR China. duanqhwz@hust.edu.cn.
  • 7 Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, 430030, Wuhan, Hubei, PR China. fengzhu@hust.edu.cn.
PMID: 31378785 DOI: 10.1038/s41419-019-1805-9
Abstract

ULK1, the upper-most protein of the ULK1 complex, is emerging as a crucial node in Autophagy induction. However, the regulation of ULK1 is not fully understood. In this study, we identified TOPK (T-LAK cell-originated protein kinase), an oncokinase, as a novel upstream kinase to phosphorylate ULK1. We found that TOPK could directly bind with and phosphorylate ULK1 at Ser469, Ser495, and Ser533. The phosphorylation of ULK1 at Ser469, Ser495, and Ser533 by TOPK decreased the activity and stability of ULK1. In addition, we want to examine the initiation of Autophagy because the reduction activity of ULK1 reduces the occurrence of Autophagy. We demonstrated that TOPK could inhibit the initiation and progression of Autophagy in glioma cells. Furthermore, TOPK inhibition increased the sensitivity of glioma cells to temozolomide (TMZ). This discovery provides insight into the problem of TMZ-resistance in GBM treatment.

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