Transketolase attenuates the chemotherapy sensitivity of glioma cells by modulating R-loop formation

• DOI: 10.1016/j.celrep.2024.115142
• Publication Date: 2025-01-09T18:02:03Z
• Authors: Minjie Fu; Mengli Zhang; Licheng Zhang; Yuan Feng; Chao Gao; Hao Xu; Jinsen Zhang; Huaichao Zhang; Tianping Peng; Youjun Chu; Yonghe Wu; Pu Wang; Dan Ye; Ying Mao; Wei Hua
• Keywords: QH301-705.5; Biology (General); CP: Cancer

Summary: Glioblastoma (GBM) is a highly lethal malignant brain tumor with poor survival rates, and chemoresistance poses a significant challenge to the treatment of patients with GBM. Here, we show that transketolase (TKT), a metabolic enzyme in the pentose phosphate pathway (PPP), attenuates the chemotherapy sensitivity of glioma cells in a manner independent of catalytic activity. Mechanistically, chemotherapeutic drugs can facilitate the translocation of TKT protein from the cytosol into the nucleus, where TKT physically interacts with XRN2 to regulate the resolution and removal of R-loops. Depletion of TKT leads to increased R-loop accumulation and genome instability, increasing the susceptibility of glioma cells to chemotherapy. In conclusion, our study reveals a non-metabolic function of TKT in regulating R-loop dynamics, genome instability, and chemotherapy sensitivity in gliomas.