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RNF7 Facilitated the Tumorigenesis of Pancreatic Cancer by Activating PI3K/Akt Signaling Pathway. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2023; 2023:1728463. [PMID: 36644576 PMCID: PMC9833898 DOI: 10.1155/2023/1728463] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 12/03/2022] [Accepted: 12/14/2022] [Indexed: 01/06/2023]
Abstract
RING finger protein-7 (RNF7) functions as a positive regulator in the progression of multiple malignancies. However, the underlying mechanism by which RNF7 contributes to pancreatic cancer (PC) is lacking. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to test the level of RNF7expression in PC cell lines and tissues. The role of RNF7 in PC tumorigenesis was analyzed by Cell Counting Kit-8 (CCK-8). 5-Ethynyl-20-deoxyuridine (EdU), wound-healing/Transwell assays, as well as a subcutaneous tumorigenesis model were constructed to assess the role of RNF7 in PC cells. The association between RNF7 and PI3K/Akt signaling were assessed by western blot and further confirmed by rescue experiments. The PC patients with upregulated expression of RNF7 had poor survival. Overexpression of RNF7 significantly facilitated PC proliferative and migrative and invasive properties in vitro and vivo; however, knockdown of RNF7exhibited the opposite results. Mechanistically, RNF7 promoted PANC-1 and SW1990 cell growth through impacting the activation of the PI3K/Akt signaling pathway. Our data demonstrated that RNF7 promoted PC tumorigenesis via activating the PI3K/Akt signaling pathway and might be regarded as one of the potential therapies to PC.
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Tan M, Chang Y, Liu X, Li H, Tang Z, Nyati MK, Sun Y. The Sag-Shoc2 axis regulates conversion of mPanINs to cystic lesions in Kras pancreatic tumor model. Cell Rep 2022; 41:111837. [PMID: 36543126 DOI: 10.1016/j.celrep.2022.111837] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 10/15/2022] [Accepted: 11/24/2022] [Indexed: 12/24/2022] Open
Abstract
SAG/RBX2 is an E3 ligase, whereas SHOC2 is a RAS-RAF positive regulator. In this study, we address how Sag-Shoc2 crosstalk regulates pancreatic tumorigenesis induced by KrasG12D. Sag deletion increases the size of pancreas and causes the conversion of murine pancreatic intraepithelial neoplasms (mPanINs) to neoplastic cystic lesions with a mechanism involving Shoc2 accumulation, suggesting that Sag determines the pathological process via targeting Shoc2. Shoc2 deletion significantly inhibits pancreas growth, mPanIN formation, and acinar cell transdifferentiation, indicating that Shoc2 is essential for KrasG12D-induced pancreatic tumorigenesis. Likewise, in a primary acinar 3D culture, Sag deletion inhibits acinar-to-ductal transdifferentiation, while Shoc2 deletion significantly reduces the duct-like structures. Mechanistically, SAG is an E3 ligase that targets SHOC2 for degradation to affect both Mapk and mTorc1 pathways. Shoc2 deletion completely rescues the phenotype of neoplastic cystic lesions induced by Sag deletion, indicating physiological relevance of the Sag-Shoc2 crosstalk. Thus, the Sag-Shoc2 axis specifies the pancreatic tumor types induced by KrasG12D.
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Affiliation(s)
- Mingjia Tan
- Department of Radiation Oncology, NCRC, Building 520, University of Michigan, Ann Arbor, MI 48105, USA
| | - Yu Chang
- Department of Radiation Oncology, NCRC, Building 520, University of Michigan, Ann Arbor, MI 48105, USA
| | - Xiaoqiang Liu
- Department of Radiation Oncology, NCRC, Building 520, University of Michigan, Ann Arbor, MI 48105, USA
| | - Hua Li
- Department of Radiation Oncology, NCRC, Building 520, University of Michigan, Ann Arbor, MI 48105, USA
| | - Zaiming Tang
- Cancer Institute, The Second Affiliated Hospital, and Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China
| | - Mukesh K Nyati
- Department of Radiation Oncology, NCRC, Building 520, University of Michigan, Ann Arbor, MI 48105, USA
| | - Yi Sun
- Cancer Institute, The Second Affiliated Hospital, and Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China; Zhejiang University Cancer Center, Hangzhou 310029, China; Research Center for Life Science and Human Health, Binjiang Institute of Zhejiang University, Hangzhou, Zhejiang 310053, China.
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Huang T, Li J, Liu X, Shi B, Li S, An HX. An integrative pan-cancer analysis revealing the difference in small ring finger family of SCF E3 ubiquitin ligases. Front Immunol 2022; 13:968777. [PMID: 36059474 PMCID: PMC9434121 DOI: 10.3389/fimmu.2022.968777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 08/01/2022] [Indexed: 11/18/2022] Open
Abstract
Background The SCF (Skp1-cullin-F-box proteins) complex is the largest family of E3 ubiquitin ligases that mediate multiple specific substrate proteins degradation. Two ring-finger family members RBX1/ROC1 and RBX2/RNF7/SAG are small molecular proteins necessary for ubiquitin ligation activity of the multimeric SCF complex. Accumulating evidence indicated the involvement of RBX proteins in the pathogenesis and development of cancers, but no research using pan-cancer analysis for evaluating their difference has been directed previously. Methods We investigated RBX1/2 expression patterns and the association with clinicopathological features, and survivals of cancer patients obtained from the TCGA pan-cancer data. The binding energies of RBX1/2-CUL1 complexes were preliminarily calculated by using molecular dynamics simulations. Meanwhile, we assessed their immune infiltration level across numerous databases, including TISIDB and Timer database. Results High expression levels of RBX1/2 were observed in most cancer types and correlated with poor prognosis of patients analyzed. Nonetheless, exceptions were observed: RBX2 expression in KICH was higher than normal renal tissues and played a detrimental role in KICH. The expression of RBX1 was not associated with the prognostic risk of KICH. Moreover, the combination of RBX1 and CUL1 expression is more stable than that of RBX2 and CUL1. RBX1/2 expression showed their own specific characteristics in tumor pathological stages and grades, copy number variation and immune components. Conclusions These findings not only indicated that the difference of RBX1/2 might result in varying degrees of tumor progression, but also suggested that they might serve as biomarkers for immune infiltration in cancers, shedding new light on therapeutics of cancers.
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Affiliation(s)
- Tingting Huang
- Department of Medical Oncology, Xiang’an Hospital of Xiamen University, Xiamen, China
- Department of Medical Oncology, Xiamen Key Laboratory of Endocrine-Related Cancer Precision Medicine, Xiamen, China
| | - Jiwei Li
- Department of Respiratory, Critical Care and Sleep Medicine, Xiang’an Hospital of Xiamen University, Xiamen, China
| | - Xinli Liu
- Department of Medical Oncology, Xiang’an Hospital of Xiamen University, Xiamen, China
| | - Bingbing Shi
- Department of Critical Care Medicine, The Affiliated Hospital of Putian University, Putian, China
| | - Shiqin Li
- Department of Gastroenterology, Xiamen Branch, Zhongshan Hospital, Fudan University, Xiamen, China
| | - Han-Xiang An
- Department of Medical Oncology, Xiang’an Hospital of Xiamen University, Xiamen, China
- *Correspondence: Hanxiang An,
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Park HB, Baek KH. E3 ligases and deubiquitinating enzymes regulating the MAPK signaling pathway in cancers. Biochim Biophys Acta Rev Cancer 2022; 1877:188736. [DOI: 10.1016/j.bbcan.2022.188736] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 04/30/2022] [Accepted: 05/11/2022] [Indexed: 12/13/2022]
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Li L, Kang J, Zhang W, Cai L, Wang S, Liang Y, Jiang Y, Liu X, Zhang Y, Ruan H, Chen G, Wang M, Jia L. Validation of NEDD8-conjugating enzyme UBC12 as a new therapeutic target in lung cancer. EBioMedicine 2019; 45:81-91. [PMID: 31208947 PMCID: PMC6642072 DOI: 10.1016/j.ebiom.2019.06.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 05/31/2019] [Accepted: 06/05/2019] [Indexed: 11/18/2022] Open
Abstract
Background The neddylation pathway is overactivated in human cancers. Inhibition of neddylation pathway has emerged as an attractive anticancer strategy. The mechanisms underlying neddylation overactivation in cancer remain elusive. MLN4924/Pevonedistat, a first-in-class NEDD8-activating enzyme (NAE, E1) inhibitor, exerts significant anti-tumor effects, but its mutagenic resistance remains unresolved. Methods The expression of NEDD8-conjugating enzyme UBC12/UBE2M (E2) and NEDD8 were estimated by bioinformatics analysis and western blot in human lung cancer cell lines. The malignant phenotypes of lung cancer cells were evaluated both in vitro and in vivo upon UBC12 knockdown. Cell-cycle arrest was evaluated by quantitative proteomic analysis and propidium iodide stain and fluorescence - activated cell sorting (FACS). The growth of MLN4924 - resistant H1299 cells was also evaluated upon UBC12 knockdown. Findings The mRNA level of UBC12 in lung cancer tissues was much higher than that in normal lung tissues, increased with disease deterioration, and positively correlated with NEDD8 expression. Moreover, the overexpression of UBC12 significantly enhanced protein neddylation modification whereas the downregulation of UBC12 reduced neddylation modification of target proteins. Functionally, neddylation inactivation by UBC12 knockdown suppressed the malignant phenotypes of lung cancer cells both in vitro and in vivo. The quantitative proteomic analysis and cell cycle profiling showed that UBC12 knockdown disturbed cell cycle progression by triggering G2 phase cell-cycle arrest. Further mechanistical studies revealed that UBC12 knockdown inhibited Cullin neddylation, led to the inactivation of CRL E3 ligases and induced the accumulation of tumor-suppressive CRL substrates (p21, p27 and Wee1) to induce cell cycle arrest and suppress the malignant phenotypes of lung cancer cells. Finally, UBC12 knockdown effectively inhibited the growth of MLN4924-resistant lung cancer cells. Interpretation These findings highlight a crucial role of UBC12 in fine-tuned regulation of neddylation activation status and validate UBC12 as an attractive alternative anticancer target against neddylation pathway. Fund Chinese Minister of Science and Technology grant (2016YFA0501800), National Natural Science Foundation of China (Grant Nos. 81401893, 81625018, 81820108022, 81772470, 81572340 and 81602072), Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-10-E00056), Program of Shanghai Academic/Technology Research Leader (18XD1403800), National Thirteenth Five-Year Science and Technology Major Special Project for New Drug and Development (2017ZX09304001). The funders had no role in study design, data collection, data analysis, interpretation, writing of the report.
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Affiliation(s)
- Lihui Li
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jihui Kang
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Wenjuan Zhang
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China; Cancer Institute, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Lili Cai
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Shiwen Wang
- Department of Laboratory Medicine, Huadong Hospital, Affiliated to Fudan University, Shanghai, China
| | - Yupei Liang
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yanyu Jiang
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Xiaojun Liu
- Cancer Institute, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Yunjing Zhang
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hongfeng Ruan
- The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Traditional Chinese Medicine), Hangzhou, Zhejiang, China
| | - Guoan Chen
- School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Mingsong Wang
- Xinhua Hospital, Shanghai Jiaotong University, Shanghai, China
| | - Lijun Jia
- Cancer Institute of Traditional Chinese Medicine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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Wang Y, Tan M, Li H, Li H, Sun Y. Inactivation of SAG or ROC1 E3 Ligase Inhibits Growth and Survival of Renal Cell Carcinoma Cells: Effect of BIM. Transl Oncol 2019; 12:810-818. [PMID: 30954776 PMCID: PMC6451688 DOI: 10.1016/j.tranon.2019.03.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/13/2019] [Accepted: 03/15/2019] [Indexed: 01/28/2023] Open
Abstract
SAG (Sensitive to Apoptosis Gene) and ROC1 (Regulator of Cullin-1) are two family members of the RING component of CRL (Cullin RING ligase). Both members are essential for growth and survival of several types of human cancer cells; their role in renal cell carcinoma (RCC), however, remains elusive. Here we reported that compared to adjacent normal tissues, both SAG and ROC1 are overexpressed in RCC, which is positively correlated with poor patient survival, particularly for SAG. Depletion of SAG or ROC1 inhibited growth and survival of RCC cells by inducing G2/M arrest, senescence, and apoptosis likely due to accumulation of WEE1, p21, p27, NOXA, and BIM. Interestingly, simultaneous BIM knockdown in RCC cells partially rescues growth suppression triggered by depletion of SAG, but not ROC1, suggesting a differential role of BIM. Collectively, our study provides the proof-of-concept evidence that RING components of CRL are attractive candidates for targeted therapy of RCC.
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Affiliation(s)
- Yu Wang
- Department of Nephrology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi, China; Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, United States
| | - Mingjia Tan
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, United States
| | - Hua Li
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, United States
| | - Haomin Li
- Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310029, China
| | - Yi Sun
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109, United States; Institute of Translational Medicine and Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310029, China.
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Tan M, Xu J, Siddiqui J, Feng F, Sun Y. Depletion of SAG/RBX2 E3 ubiquitin ligase suppresses prostate tumorigenesis via inactivation of the PI3K/AKT/mTOR axis. Mol Cancer 2016; 15:81. [PMID: 27955654 PMCID: PMC5153812 DOI: 10.1186/s12943-016-0567-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 12/06/2016] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND SAG (Sensitive to Apoptosis Gene), also known as RBX2, ROC2 or RNF7, is a RING component of CRL (Cullin-RING ligase), required for its activity. Our recent study showed that SAG/RBX2 co-operated with Kras to promote lung tumorigenesis, but antagonized Kras to inhibit skin tumorigenesis, suggesting a tissue/context dependent function of Sag. However, it is totally unknown whether and how Sag would play in prostate tumorigenesis, triggered by Pten loss. METHODS Sag and Pten double conditional knockout mice were generated and prostate specific deletion of Sag and Pten was achieved by PB4-Cre, and their effect on prostate tumorigenesis was evaluated by H&E staining. The methods of immunohistochemistry (IHC) staining and Western blotting were utilized to examine expression of various proteins in prostate cancer tissues or cell lines. The effect of SAG knockdown in proliferation, survival and migration was evaluated in two prostate cancer cell lines. The poly-ubiquitylation of PHLPP1 and DEPTOR was evaluated by both in vivo and in vitro ubiquitylation assays. RESULTS SAG is overexpressed progressively from early-to-late stage of human prostate cancer with the highest expression seen in metastatic lesion. Sag deletion inhibits prostate tumorigenesis triggered by Pten loss in a mouse model as a result of suppressed proliferation. SAG knockdown in human prostate cancer cells inhibits a) proliferation in monolayer and soft agar, b) clonogenic survival, and c) migration. SAG is an E3 ligase that promotes ubiquitylation and degradation of PHLPP1 and DEPTOR, leading to activation of the PI3K/AKT/mTOR axis, whereas SAG knockdown caused their accumulation. Importantly, growth suppression triggered by SAG knockdown was partially rescued by simultaneous knockdown of PHLPP1 or DEPTOR, suggesting their causal role. Accumulation of Phlpp1 and Deptor with corresponding inactivation of Akt/mTOR was also detected in Sag-null prostate cancer tissues. CONCLUSIONS Sag is an oncogenic cooperator of Pten-loss for prostate tumorigenesis. Targeting SAG E3 ligase may, therefore, have therapeutic value for the treatment of prostate cancer associated with Pten loss.
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Affiliation(s)
- Mingjia Tan
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, 4424B MS-1, 1301 Catherine Street, Ann Arbor, 48109, MI, USA
| | - Jie Xu
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, 4424B MS-1, 1301 Catherine Street, Ann Arbor, 48109, MI, USA
| | - Javed Siddiqui
- Department of Pathology, University of Michigan, 4424B MS-1, 1301 Catherine Street, Ann Arbor, 48109, MI, USA
| | - Felix Feng
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, 4424B MS-1, 1301 Catherine Street, Ann Arbor, 48109, MI, USA.,Department of Radiation Oncology, University of San Francisco, San Francisco, CA, USA
| | - Yi Sun
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, 4424B MS-1, 1301 Catherine Street, Ann Arbor, 48109, MI, USA. .,Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, Zhejiang, People's Republic of China. .,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, People's Republic of China.
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