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논문 기본 정보

자료유형
학술저널
저자정보
Fei Xiaowei (Air Force Military Medical University) Dou Ya-nan (Air Force Military Medical University) Sun Kai (Third Military Medical University) Wei Jialiang (Air Force Military Medical University) Guo Qingdong (Air Force Military Medical University) Wang Li (Air Force Military Medical University) Wu Xiuquan (Air Force Military Medical University) Lv Weihao (Air Force Military Medical University) Jiang Xiaofan (Air Force Military Medical University) Fei Zhou (Air Force Military Medical University)
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제55권
발행연도
2023.6
수록면
1,203 - 1,217 (15page)
DOI
10.1038/s12276-023-01007-y

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The tripartite motif (TRIM) 22 and mitogen-activated protein kinase (MAPK) signaling pathways play critical roles in the growth of glioblastoma (GBM). However, the molecular mechanism underlying the relationship between TRIM22 and MAPK signaling remains unclear. Here, we found that TRIM22 binds to exon 2 of the sphingosine kinase 2 (SPHK2) gene. An ERK1/2-driven luciferase reporter construct identified TRIM22 as a potential activator of MAPK signaling. Knockout and overexpression of TRIM22 regulate the inhibition and activation of MAPK signaling through the RING-finger domain. TRIM22 binds to Raf-1, a negative regulator of MAPK signaling, and accelerates its degradation by inducing K48-linked ubiquitination, which is related to the CC and SPRY domains of TRIM22 and the C1D domain of Raf-1. In vitro and in vivo, an SPHK2 inhibitor (K145), an ERK1/2 inhibitor (selumetinib), and the nonphosphorylated mutant Raf-1S338A inhibited GBM growth. In addition, deletion of the RING domain and the nuclear localization sequence of TRIM22 significantly inhibited TRIM22-induced proliferation of GBM cells in vivo and in vitro. In conclusion, our study showed that TRIM22 regulates SPHK2 transcription and activates MAPK signaling through posttranslational modification of two critical regulators of MAPK signaling in GBM cells.

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