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He B, Bie Q, Zhao R, Yan Y, Dong G, Zhang B, Wang S, Xu W, Tian D, Hao Y, Zhang Y, Zhao M, Xiong H, Zhang B. Arachidonic acid released by PIK3CA mutant tumor cells triggers malignant transformation of colonic epithelium by inducing chromatin remodeling. Cell Rep Med 2024; 5:101510. [PMID: 38614093 PMCID: PMC11148513 DOI: 10.1016/j.xcrm.2024.101510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 02/07/2024] [Accepted: 03/20/2024] [Indexed: 04/15/2024]
Abstract
Key gene mutations are essential for colorectal cancer (CRC) development; however, how the mutated tumor cells impact the surrounding normal cells to promote tumor progression has not been well defined. Here, we report that PIK3CA mutant tumor cells transmit oncogenic signals and result in malignant transformation of intestinal epithelial cells (IECs) via paracrine exosomal arachidonic acid (AA)-induced H3K4 trimethylation. Mechanistically, PIK3CA mutations sustain SGK3-FBW7-mediated stability of the cPLA2 protein, leading to the synthetic increase in AA, which is transported through exosome and accumulated in IECs. Transferred AA directly binds Menin and strengthens the interactions of Menin and MLL1/2 methyltransferase. Finally, the combination of VTP50469, an inhibitor of the Menin-MLL interaction, and alpelisib synergistically represses PDX tumors harboring PIK3CA mutations. Together, these findings unveil the metabolic link between PIK3CA mutant tumor cells and the IECs, highlighting AA as the potential target for the treatment of patients with CRC harboring PIK3CA mutations.
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Affiliation(s)
- Baoyu He
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China; School of Integrative Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
| | - Qingli Bie
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China; School of Integrative Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
| | - Rou Zhao
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Yugang Yan
- School of Medical Engineering, Jining Medical University, Jining, Shandong 272067, China
| | - Guanjun Dong
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, China
| | - Baogui Zhang
- Department of Gastrointestinal Surgery, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Sen Wang
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Wenrong Xu
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212000, China
| | - Dongxing Tian
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Yujun Hao
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Yanhua Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Mingsheng Zhao
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, China
| | - Huabao Xiong
- Institute of Immunology and Molecular Medicine, Jining Medical University, Jining, Shandong 272067, China.
| | - Bin Zhang
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China.
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Guo Y, Cheng R, Wang Y, Gonzalez ME, Zhang H, Liu Y, Kleer CG, Xue L. Regulation of EZH2 protein stability: new mechanisms, roles in tumorigenesis, and roads to the clinic. EBioMedicine 2024; 100:104972. [PMID: 38244292 PMCID: PMC10835131 DOI: 10.1016/j.ebiom.2024.104972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/13/2023] [Accepted: 01/04/2024] [Indexed: 01/22/2024] Open
Abstract
The importance of EZH2 as a key methyltransferase has been well documented theoretically. Practically, the first EZH2 inhibitor Tazemetostat (EPZ6438), was approved by FDA in 2020 and is used in clinic. However, for most solid tumors it is not as effective as desired and the scope of clinical indications is limited, suggesting that targeting its enzymatic activity may not be sufficient. Recent technologies focusing on the degradation of EZH2 protein have drawn attention due to their potential robust effects. This review focuses on the molecular mechanisms that regulate EZH2 protein stability via post-translational modifications (PTMs), mainly including ubiquitination, phosphorylation, and acetylation. In addition, we discuss recent advancements of multiple proteolysis targeting chimeras (PROTACs) strategies and the latest degraders that can downregulate EZH2 protein. We aim to highlight future directions to expand the application of novel EZH2 inhibitors by targeting both EZH2 enzymatic activity and protein stability.
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Affiliation(s)
- Yunyun Guo
- Cancer Center of Peking University Third Hospital, Beijing, China; Center of Basic Medical Research, Institute of Medical Innovation and Research, Peking University Third Hospital, Beijing, China
| | - Rui Cheng
- Cancer Center of Peking University Third Hospital, Beijing, China; Center of Basic Medical Research, Institute of Medical Innovation and Research, Peking University Third Hospital, Beijing, China
| | - Yuqing Wang
- Center of Basic Medical Research, Institute of Medical Innovation and Research, Peking University Third Hospital, Beijing, China
| | - Maria E Gonzalez
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Hongshan Zhang
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Yang Liu
- Cancer Center of Peking University Third Hospital, Beijing, China; Center of Basic Medical Research, Institute of Medical Innovation and Research, Peking University Third Hospital, Beijing, China.
| | - Celina G Kleer
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI, 48109, USA.
| | - Lixiang Xue
- Cancer Center of Peking University Third Hospital, Beijing, China; Center of Basic Medical Research, Institute of Medical Innovation and Research, Peking University Third Hospital, Beijing, China.
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Kim CW, Lee JM, Park SW. Divergent roles of the regulatory subunits of class IA PI3K. Front Endocrinol (Lausanne) 2024; 14:1152579. [PMID: 38317714 PMCID: PMC10839044 DOI: 10.3389/fendo.2023.1152579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 12/11/2023] [Indexed: 02/07/2024] Open
Abstract
The regulatory subunit of phosphatidylinositol 3-kinase (PI3K), known as p85, is a critical component in the insulin signaling pathway. Extensive research has shed light on the diverse roles played by the two isoforms of p85, namely p85α and p85β. The gene pik3r1 encodes p85α and its variants, p55α and p50α, while pik3r2 encodes p85β. These isoforms exhibit various activities depending on tissue types, nutrient availability, and cellular stoichiometry. Whole-body or liver-specific deletion of pik3r1 have shown to display increased insulin sensitivity and improved glucose homeostasis; however, skeletal muscle-specific deletion of p85α does not exhibit any significant effects on glucose homeostasis. On the other hand, whole-body deletion of pik3r2 shows improved insulin sensitivity with no significant impact on glucose tolerance. Meanwhile, liver-specific double knockout of pik3r1 and pik3r2 leads to reduced insulin sensitivity and glucose tolerance. In the context of obesity, upregulation of hepatic p85α or p85β has been shown to improve glucose homeostasis. However, hepatic overexpression of p85α in the absence of p50α and p55α results in increased insulin resistance in obese mice. p85α and p85β have distinctive roles in cancer development. p85α acts as a tumor suppressor, but p85β promotes tumor progression. In the immune system, p85α facilitates B cell development, while p85β regulates T cell differentiation and maturation. This review provides a comprehensive overview of the distinct functions attributed to p85α and p85β, highlighting their significance in various physiological processes, including insulin signaling, cancer development, and immune system regulation.
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Affiliation(s)
- Cho-Won Kim
- Division of Endocrinology, Boston Children’s Hospital, Boston, MA, United States
- Department of Pediatrics, Harvard Medical School, Boston, MA, United States
| | - Junsik M. Lee
- Division of Endocrinology, Boston Children’s Hospital, Boston, MA, United States
| | - Sang Won Park
- Division of Endocrinology, Boston Children’s Hospital, Boston, MA, United States
- Department of Pediatrics, Harvard Medical School, Boston, MA, United States
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4
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Li Y, Wu S, Zhao Y, Dinh T, Jiang D, Selfridge JE, Myers G, Wang Y, Zhao X, Tomchuck S, Dubyak G, Lee RT, Estfan B, Shapiro M, Kamath S, Mohamed A, Huang SCC, Huang AY, Conlon R, Krishnamurthi S, Eads J, Willis JE, Khorana AA, Bajor D, Wang Z. Neutrophil extracellular traps induced by chemotherapy inhibit tumor growth in murine models of colorectal cancer. J Clin Invest 2024; 134:e175031. [PMID: 38194275 PMCID: PMC10904055 DOI: 10.1172/jci175031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 01/05/2024] [Indexed: 01/10/2024] Open
Abstract
Neutrophil extracellular traps (NETs), a web-like structure of cytosolic and granule proteins assembled on decondensed chromatin, kill pathogens and cause tissue damage in diseases. Whether NETs can kill cancer cells is unexplored. Here, we report that a combination of glutaminase inhibitor CB-839 and 5-FU inhibited the growth of PIK3CA-mutant colorectal cancers (CRCs) in xenograft, syngeneic, and genetically engineered mouse models in part through NETs. Disruption of NETs by either DNase I treatment or depletion of neutrophils in CRCs attenuated the efficacy of the drug combination. Moreover, NETs were present in tumor biopsies from patients treated with the drug combination in a phase II clinical trial. Increased NET levels in tumors were associated with longer progression-free survival. Mechanistically, the drug combination induced the expression of IL-8 preferentially in PIK3CA-mutant CRCs to attract neutrophils into the tumors. Further, the drug combination increased the levels of ROS in neutrophils, thereby inducing NETs. Cathepsin G (CTSG), a serine protease localized in NETs, entered CRC cells through the RAGE cell surface protein. The internalized CTSG cleaved 14-3-3 proteins, released BAX, and triggered apoptosis in CRC cells. Thus, our studies illuminate a previously unrecognized mechanism by which chemotherapy-induced NETs kill cancer cells.
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Affiliation(s)
- Yamu Li
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
| | - Sulin Wu
- Department of Genetics and Genome Sciences
- Department of Internal Medicine
- Department of Medical Genetics, Case Western Reserve University, Cleveland, Ohio. USA
| | - Yiqing Zhao
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
| | - Trang Dinh
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
| | - Dongxu Jiang
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
| | - J. Eva Selfridge
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
- Department of Internal Medicine
- Seidman Cancer Center, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | | | - Yuxiang Wang
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
| | - Xuan Zhao
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
| | | | - George Dubyak
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio. USA
| | - Richard T. Lee
- Department of Internal Medicine
- Seidman Cancer Center, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | - Bassam Estfan
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Marc Shapiro
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Suneel Kamath
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Amr Mohamed
- Department of Internal Medicine
- Seidman Cancer Center, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | | | | | | | | | - Jennifer Eads
- Department of Internal Medicine
- Seidman Cancer Center, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Alok A. Khorana
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - David Bajor
- Department of Internal Medicine
- Seidman Cancer Center, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | - Zhenghe Wang
- Department of Genetics and Genome Sciences
- Case Comprehensive Cancer Center
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5
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He B, Liang J, Qin Q, Zhang Y, Shi S, Cao J, Zhang Z, Bie Q, Zhao R, Wei L, Zhang B, Zhang B. IL-13/IL-13RA2 signaling promotes colorectal cancer stem cell tumorigenesis by inducing ubiquitinated degradation of p53. Genes Dis 2024; 11:495-508. [PMID: 37588218 PMCID: PMC10425805 DOI: 10.1016/j.gendis.2023.01.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 01/03/2023] [Accepted: 01/17/2023] [Indexed: 08/18/2023] Open
Abstract
Cancer stem cells (CSCs) are considered tumor-initiating cells and the main drivers of disease progression. Targeting these rare cancer cells, however, remains challenging with respect to therapeutic benefit. Here, we report the up-regulation of IL-13RA2 expression in colorectal cancer (CRC) tissues and spheroid cells. The expression of IL-13RA2 was positively correlated with canonical stemness markers in CRC. We further demonstrated that the level of IL-13 was up-regulated in the serum of CRC patients. Biologically, recombinant IL-13 (rIL-13) stimulation promoted the sphere formation, proliferation, and migration of CRC cells in vitro and enhanced tumorigenesis in vivo. This phenotype could be reversed by knocking down IL-13RA2. Mechanistically, IL-13 activated autophagy by inducing LC3I/LC3II transformation in CRC-CSCs, which was crucial for the biological functions of IL-13. We further demonstrated that IL-13RA2 acted as a modular link of the E3 ligase UBE3C and the substrate p53 protein, enhancing the interaction of UBE3C and p53, thereby inducing the K48-linked ubiquitination of p53. In conclusion, the IL-13/IL-13RA2 signaling cascade promotes CRC-CSC self-renewal and tumorigenesis by inducing p53 ubiquitination, adding an important layer to the connection between IL-13 and p53, which can be translated into novel targeted therapies.
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Affiliation(s)
- Baoyu He
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
- Postdoctoral Mobile Station of Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
| | - Jing Liang
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Qianqian Qin
- Department of Reproductive Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Yuqin Zhang
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Shuo Shi
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Jinghe Cao
- Department of Reproductive Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Zhixin Zhang
- Department of Gastrointestinal Surgery, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Qingli Bie
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
- Postdoctoral Mobile Station of Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
| | - Rou Zhao
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Li Wei
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Baogui Zhang
- Department of Gastrointestinal Surgery, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
| | - Bin Zhang
- Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272000, China
- Postdoctoral Mobile Station of Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, China
- Institute of Forensic Medicine and Laboratory Medicine, Jining Medical University, Jining, Shandong 272067, China
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6
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Madsen RR, Toker A. PI3K signaling through a biochemical systems lens. J Biol Chem 2023; 299:105224. [PMID: 37673340 PMCID: PMC10570132 DOI: 10.1016/j.jbc.2023.105224] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 08/25/2023] [Accepted: 08/28/2023] [Indexed: 09/08/2023] Open
Abstract
Following 3 decades of extensive research into PI3K signaling, it is now evidently clear that the underlying network does not equate to a simple ON/OFF switch. This is best illustrated by the multifaceted nature of the many diseases associated with aberrant PI3K signaling, including common cancers, metabolic disease, and rare developmental disorders. However, we are still far from a complete understanding of the fundamental control principles that govern the numerous phenotypic outputs that are elicited by activation of this well-characterized biochemical signaling network, downstream of an equally diverse set of extrinsic inputs. At its core, this is a question on the role of PI3K signaling in cellular information processing and decision making. Here, we review the determinants of accurate encoding and decoding of growth factor signals and discuss outstanding questions in the PI3K signal relay network. We emphasize the importance of quantitative biochemistry, in close integration with advances in single-cell time-resolved signaling measurements and mathematical modeling.
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Affiliation(s)
- Ralitsa R Madsen
- MRC-Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee, Scotland, United Kingdom.
| | - Alex Toker
- Department of Pathology and Cancer Center, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.
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Zhou M, Gao Y, Wu S, Chen J, Ding J, Wang Y, Yang J. Ubiquitin-specific protease 7 prevents recurrent spontaneous abortion by targeting enhancer of zeste homolog 2 to regulate trophoblast proliferation, apoptosis, migration, and invasion through the Wnt/β-catenin pathway†. Biol Reprod 2023; 109:204-214. [PMID: 37249558 DOI: 10.1093/biolre/ioad053] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 04/11/2023] [Accepted: 05/11/2023] [Indexed: 05/31/2023] Open
Abstract
Trophoblasts are significant components of the placenta and play crucial roles in maternal-fetal crosstalk. Adequate trophoblast migration and invasion are essential for embryo implantation and healthy pregnancy. Ubiquitin-specific protease 7 (USP7), a member of the deubiquitinating enzyme family, regulates the processes of migration and invasion in multiple tumor cells. However, the effects of USP7 on trophoblasts and its possible mechanism in the development of recurrent spontaneous abortion (RSA) are still unclear. In this study, we analyzed the expression of USP7 in villous tissues obtained from RSA patients and healthy controls, and then GNE-6776 (a USP7-specific inhibitor) and USP7 siRNA were used in a trophoblast cell line, HTR-8/SVneo, to further assess the effect of USP7 on the biological function of trophoblasts. Our results provide convincing evidence that USP7 is downregulated in the placental villous tissues of RSA patients. USP7 was found to have a crucial role in the proliferation, apoptosis, migration, invasion, and epithelial-mesenchymal transition (EMT) process of trophoblast cells. Further experiments revealed that USP7 directly interacted with the enhancer of zeste homolog 2 (EZH2) and regulated the Wnt/β-catenin signaling pathway in trophoblasts. Taken together, these findings indicate the vital role of USP7 in regulating trophoblast proliferation, migration and invasion, thus affecting the pathogenesis of RSA, providing new insights into the important role of USP7 in the maternal-fetal interface.
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Affiliation(s)
- Mengqi Zhou
- Department of Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, Hubei, China
| | - Yue Gao
- Department of Reproductive Medicine, Maternal and Child Health Hospital of Hubei Province, Wuhan, Hubei, China
| | - Shujuan Wu
- Department of Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, Hubei, China
| | - Jiao Chen
- Department of Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, Hubei, China
| | - Jinli Ding
- Department of Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, Hubei, China
| | - Yaqin Wang
- Department of Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, Hubei, China
| | - Jing Yang
- Department of Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, Hubei, China
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8
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Li Y, Liu Z, Zhao Y, Yang J, Xiao TS, Conlon RA, Wang Z. PD-L1 expression is regulated by ATP-binding of the ERBB3 pseudokinase domain. Genes Dis 2023; 10:1702-1713. [PMID: 37397533 PMCID: PMC10311099 DOI: 10.1016/j.gendis.2022.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/02/2022] [Accepted: 11/05/2022] [Indexed: 12/13/2022] Open
Abstract
How PD-L1 expression is regulated in cancer is poorly understood. Here, we report that the ATP-binding activity of ERBB3 pseudokinase regulates PD-L1 gene expression in colorectal cancers (CRCs). ERBB3 is one of the four members of the EGF receptor family, all with protein tyrosine kinase domains. ERBB3 is a pseudokinase with a high binding affinity to ATP. We showed that ERBB3 ATP-binding inactivation mutant reduces tumorigenicity in genetically engineered mouse models and impairs xenograft tumor growth of CRC cell lines. The ERBB3 ATP-binding mutant cells dramatically reduce IFN-γ-induced PD-L1 expression. Mechanistically, ERBB3 regulates IFN-γ-induced PD-L1 expression through the IRS1-PI3K-PDK1-RSK-CREB signaling axis. CREB is the transcription factor that regulates PD-L1 gene expression in CRC cells. Knockin of a tumor-derived ERBB3 mutation located in the kinase domain sensitizes mouse colon cancers to anti-PD1 antibody therapy, suggesting that ERBB3 mutations could be predictive biomarkers for tumors amenable to immune checkpoint therapy.
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Affiliation(s)
- Yamu Li
- Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH 44106, USA
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Zhonghua Liu
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Yiqing Zhao
- Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH 44106, USA
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Jie Yang
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Tsan Sam Xiao
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Ronald A. Conlon
- Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH 44106, USA
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Zhenghe Wang
- Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH 44106, USA
- Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44106, USA
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9
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Zhang Y, He B, Zhang D, Zhang Y, Chen C, Zhang W, Yang S, Yao M, Cui G, Gu J, Wang T, Lin Z, Fan Y, Xiong Z, Hao Y. FAK-mediated phosphorylation at Y464 regulates p85β nuclear translocation to promote tumorigenesis of ccRCC by repressing RB1 expression. Cell Rep 2023; 42:112188. [PMID: 36857183 DOI: 10.1016/j.celrep.2023.112188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 01/20/2023] [Accepted: 02/13/2023] [Indexed: 03/02/2023] Open
Abstract
PI3K regulatory subunit p85s normally stabilizes and regulates catalytic subunit p110s in the cytoplasm. Recent studies show that p110-free p85s in the nucleus plays important roles in biological processes. However, the mechanisms by which p85s translocate into the nucleus remain elusive. Here, we describe the mechanism by which p85β translocates into the nucleus to promote ccRCC tumorigenesis. Phosphorylation of p85β at the Y464 by FAK facilitates its nuclear translocation in the kidney through enhancing the binding of p85β to KPNA1. PIK3R2/p85β is highly expressed in ccRCC samples and associated with overall survival of ccRCC patients. Nuclear but not cytoplasmic p85β performs oncogenic functions by repressing RB1 expression and regulating the G1/S cell cycle transition. Nuclear p85β represses RB1 expression by stabilizing histone methyltransferase EZH1/EZH2 proteins. Last, the FAK inhibitor defactinib significantly suppresses the tumor growth of ccRCC with high p85β Y464 levels.
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Affiliation(s)
- Yanhua Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Baoyu He
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China; Department of Laboratory Medicine, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, China
| | - Dong Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Yifan Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Chengkun Chen
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Wenye Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China; Department of Urology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Shiyi Yang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Meilian Yao
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Gaoping Cui
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Jun Gu
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Ting Wang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Zhang Lin
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Youben Fan
- Department of Thyroid-Breast-Hernia Surgery, Thyroid and Parathyroid Center, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Zuquan Xiong
- Department of Urology, Huashan Hospital, Fudan University, Shanghai 200040, China.
| | - Yujun Hao
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China.
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He B, Hao Y. Targeting p85β nuclear translocation for the tumors with PIK3CA helical domain mutations. Genes Dis 2022; 9:1391-1393. [PMID: 36157480 PMCID: PMC9485267 DOI: 10.1016/j.gendis.2022.05.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 05/16/2022] [Indexed: 11/27/2022] Open
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Pozo FM, Hunter T, Zhang Y. The 'New (Nu)-clear' evidence for the tumor-driving role of PI3K. ACTA MATERIA MEDICA 2022; 1:193-196. [PMID: 37200937 PMCID: PMC10191166 DOI: 10.15212/amm-2022-0013] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The classical phosphatidylinositol 3-kinases (PI3Ks) are heterodimers of p110 and p85. PIK3CA, the gene encoding the catalytic p110α subunit, is one of the most frequently mutated oncogenes in human cancers with hot spot mutations occurring in the helical domain or in the kinase domain. Tumors with these two types of PIK3CA mutations show overlapping yet distinct phenotypes; however, the underlying mechanisms remain unclear. In a recent publication [1], Hao et al revealed exciting findings about the PI3K p85β regulatory subunit in promoting PIK3CA helical domain mutation-driven cancer progression. The authors found that p85β disassociated from the PI3K complex and translocated into the nucleus only in cancer cells harboring PIK3CA helical domain mutations. Disrupting nuclear localization of p85β suppressed mouse tumor growth of cancer cells with PIK3CA helical domain mutation. Mechanistically, they elegantly showed that nuclear p85β recruited the deubiquitinase USP7 to stabilize the histone methyltransferases EZH1/2, leading to enhanced H3K27 trimethylation and gene transcription. Combining an EZH inhibitor with a PI3K inhibitor specifically resulted in regression of mouse xenograft tumors with PIK3CA helical domain mutations. These findings illustrate a previously uncharacterized function of p85β in tumor development and suggest an effective approach to target tumors with PIK3CA helical mutations.
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Affiliation(s)
- Franklin Mayca Pozo
- Department of Pharmacology, Case Comprehensive Cancer Center, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Tony Hunter
- Molecular & Cell Biology Laboratory, The Salk Institute, La Jolla, CA 92037, USA
| | - Youwei Zhang
- Department of Pharmacology, Case Comprehensive Cancer Center, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Correspondence: Youwei Zhang: Department of Pharmacology, Case Western Reserve University, 2123 Adelbert Road, Wood Building W343A, Cleveland, OH 44106, USA. Tel.: +1-216-368-7588; Fax: +1-216-368-1300;
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