Hong Yao1, Wanqun Xie1, Yuting Dai2, Yanting Liu1, Weiting Gu1, Jianfeng Li2, Liang Wu2, Jing Xie3, Weiwei Rui3, Bohan Ren4, Li Xue1, Yijun Cheng1, Shaojian Lin1, Changsheng Li1, Hao Tang1, Yu Wang5, Meiqing Lou6, Xiaobiao Zhang7, Ronggui Hu8, Hanbing Shang1, Jinyan Huang2, Zhe Bao Wu1,4. 1. Department of Neurosurgery, Center of Pituitary Tumor, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. 2. Shanghai Institute of Hematology, State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. 3. Department of Pathology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. 4. Department of Neurosurgery, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China. 5. Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. 6. Department of Neurosurgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. 7. Department of Neurosurgery, Zhongshan Hospital, Fudan University, Shanghai, China. 8. State Key Laboratory of Systems Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai,China.
Abstract
BACKGROUND: Pituitary neuroendocrine tumors (PitNETs) are common intracranial tumors that are classified into seven histological subtypes, including lactotroph, somatotroph, corticotroph, thyrotroph, gonadotroph, null cell, and plurihormonal PitNETs. However, the molecular characteristics of these types of PitNETs are not completely clear. METHODS: A total of 180 consecutive cases of PitNETs were collected to perform RNA sequencing. All subtypes of PitNETs were distinguished by unsupervised clustering analysis. We investigated the regulation of TPIT by TRIM65 and its effects on ACTH production and secretion in ACTH-secreting pituitary cell lines, as well as in murine models using biochemical analyses, confocal microscopy, and luciferase reporter assays. RESULTS: A novel subtype of PitNETs derived from TPIT lineage cells was identified as with normal TPIT transcription but with lowered protein expression. Furthermore, for the first time, TRIM65 was identified as the E3 ubiquitin ligase of TPIT. Depending on the RING domain, TRIM65 ubiquitinated and degraded the TPIT protein at multiple Lys sites. In addition, TRIM65-mediated ubiquitination of TPIT inhibited POMC transcription and ACTH production to determine the fate of the novel subtype of PitNETs in vitro and in vivo. CONCLUSION: Our studies provided a novel classification of PitNETs and revealed that the TRIM65-TPIT complex controlled the fate of the novel subtype of PitNETs, which provides a potential therapy target for Cushing's disease.
BACKGROUND: Pituitary neuroendocrine tumors (PitNETs) are common intracranial tumors that are classified into seven histological subtypes, including lactotroph, somatotroph, corticotroph, thyrotroph, gonadotroph, null cell, and plurihormonal PitNETs. However, the molecular characteristics of these types of PitNETs are not completely clear. METHODS: A total of 180 consecutive cases of PitNETs were collected to perform RNA sequencing. All subtypes of PitNETs were distinguished by unsupervised clustering analysis. We investigated the regulation of TPIT by TRIM65 and its effects on ACTH production and secretion in ACTH-secreting pituitary cell lines, as well as in murine models using biochemical analyses, confocal microscopy, and luciferase reporter assays. RESULTS: A novel subtype of PitNETs derived from TPIT lineage cells was identified as with normal TPIT transcription but with lowered protein expression. Furthermore, for the first time, TRIM65 was identified as the E3 ubiquitin ligase of TPIT. Depending on the RING domain, TRIM65 ubiquitinated and degraded the TPIT protein at multiple Lys sites. In addition, TRIM65-mediated ubiquitination of TPIT inhibited POMC transcription and ACTH production to determine the fate of the novel subtype of PitNETs in vitro and in vivo. CONCLUSION: Our studies provided a novel classification of PitNETs and revealed that the TRIM65-TPIT complex controlled the fate of the novel subtype of PitNETs, which provides a potential therapy target for Cushing's disease.
Authors: C Couture; A Saveanu; A Barlier; J C Carel; M Fassnacht; C E Flück; M Houang; M Maes; F Phan-Hug; A Enjalbert; J Drouin; T Brue; S Vallette Journal: J Clin Endocrinol Metab Date: 2011-12-14 Impact factor: 5.958
Authors: Zhong Y Yeow; Bramwell G Lambrus; Rebecca Marlow; Kevin H Zhan; Mary-Anne Durin; Lauren T Evans; Phillip M Scott; Thao Phan; Elizabeth Park; Lorena A Ruiz; Daniela Moralli; Eleanor G Knight; Luned M Badder; Daniela Novo; Syed Haider; Catherine M Green; Andrew N J Tutt; Christopher J Lord; J Ross Chapman; Andrew J Holland Journal: Nature Date: 2020-09-09 Impact factor: 49.962