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Liu L, Lei Y, Chen W, Zhou Q, Zheng Z, Zeng G, Liu W, Feng P, Zhang Z, Yu L, Chen L. In vivo genome-wide CRISPR screening identifies ZNF24 as a negative NF-κB modulator in lung cancer. Cell Biosci 2022; 12:193. [PMID: 36457047 PMCID: PMC9717477 DOI: 10.1186/s13578-022-00933-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 11/21/2022] [Indexed: 12/03/2022] Open
Abstract
Systemic identification of tumor suppressor genes (TSGs) and elucidation of their signaling provide a new angle for understanding of tumorigenesis, which is important for developing successful treatment for lung cancer patients. In our current work, we conducted an in vivo screen for lung cancer TSGs through CRISPR/Cas9 mediated knockout of genes at genome-wide scale. We found that ZNF24 was a potent and clinically relevant TSG of lung cancer. Ectopic expression of ZNF24 arrested lung cancer cells in S phase. Mechanistically, ZNF24 bound to promoter region of P65 to negatively regulate its transcription and thereby the signaling activity of NF-κB pathway. This signaling cascade is clinically relevant. Importantly, we found that combinational inhibition of KRAS, NF-κB, and PD-1 effectively shrank autochthonous KrasG12D/ZNF24-/- lung cancers in transgenic mouse model. Our current work thus revealed an important role played by loss of function of ZNF24 in lung tumorigenesis and shed new light in precision medicine for a portion of lung cancer patients.
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Affiliation(s)
- Lu Liu
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Yuxi Lei
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Wensheng Chen
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Qian Zhou
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Zongyao Zheng
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Guandi Zeng
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Wanting Liu
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Pengju Feng
- grid.258164.c0000 0004 1790 3548Department of Chemistry, Jinan University, Guangzhou, 510632 China
| | - Zhiyi Zhang
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
| | - Lei Yu
- grid.24696.3f0000 0004 0369 153XBeijing Tongren Hospital, Capital Medical University, Beijing, 100730 China
| | - Liang Chen
- grid.258164.c0000 0004 1790 3548MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou, 510632 China
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Chen J, Guo J, Yuan Y, Wang Y. Zinc Finger Protein 24 is a Prognostic Factor in Ovarian Serous Carcinoma. Appl Immunohistochem Mol Morphol 2022; 30:136-144. [PMID: 34608874 DOI: 10.1097/pai.0000000000000980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Accepted: 09/06/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVE As a member of the zinc finger protein family, zinc finger protein 24 (ZNF24) contains a Cys2His2 zinc finger domain and acts as a transcription factor. ZNF24 has been reported to be downregulated in gastric cancer and breast cancer. However, little is known about its expression and function in ovarian serous carcinoma (OSC). PATIENTS AND METHODS We collected 117 OSC patients during 2011 to 2017 and retrospectively retrieved their clinicopathologic characteristics as well as their survival data. Protein level was analyzed by immunohistochemistry, mRNA level was evaluated by RT-qPCR assay, and transcriptional data was obtained from TCGA data sets. The correlations between ZNF24 expression and patients' features were assessed using χ2 test. Univariate and multivariate analyses were used to identify the prognosis predicative potential of ZNF24 in OSC. The function of ZNF24 in the epithelial ovarian cancer cells was also verified by in vitro cellular experiments. RESULTS Among the 117 cases, ZNF24 was downregulated in 52 OSC samples (44.6%) and significantly correlated with tumor stages. According to univariate and multivariate analyses, ZNF24 can act as an independent prognostic indicator for the overall survival of OSC patients, whose lower expression was associated with poorer clinical outcomes. Ectopic overexpression and knockdown assays indicated that ZNF24 can negatively regulate the OSC cell viability. CONCLUSIONS OSC patients with low level of ZNF24 have worse overall survival compared with those possess high-ZNF24 expression. Downregulated ZNF24 may be involved in the proliferation of OSC, and ZNF24 expression can serve as an independent survival predictor.
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Affiliation(s)
- Jia Chen
- Department of Obstetrics and Gynecology, Chongqing University Central Hospital, Chongqing Emergency Medical Center
| | - Juan Guo
- Department of Obstetrics and Gynecology, The Fifth People Hospital of Chongqing
| | | | - Yadong Wang
- Breast, Chongqing Traditional Chinese Medical Hospital, Chongqing, China
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Bai L, Yang G, Qin Z, Lyu J, Wang Y, Feng J, Liu M, Gong T, Li X, Li Z, Li J, Qin J, Yang W, Ding C. Proteome-Wide Profiling of Readers for DNA Modification. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2101426. [PMID: 34351703 PMCID: PMC8498917 DOI: 10.1002/advs.202101426] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 06/02/2021] [Indexed: 05/13/2023]
Abstract
DNA modifications, represented by 5-methylcytosine (5mC), 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC), play important roles in epigenetic regulation of biological processes. The specific recognition of DNA modifications by the transcriptional protein machinery is thought to be a potential mechanism for epigenetic-driven gene regulation, and many modified DNA-specific binding proteins have been uncovered. However, the panoramic view of the roles of DNA modification readers at the proteome level remains largely unclear. Here, a recently developed concatenated tandem array of consensus transcription factor (TF) response elements (catTFREs) approach is employed to profile the binding activity of TFs at DNA modifications. Modified DNA-binding activity is quantified for 1039 TFs, representing 70% of the TFs in the human genome. Additionally, the modified DNA-binding activity of 600 TFs is monitored during the mouse brain development from the embryo to the adult stages. Readers of these DNA modifications are predicted, and the hierarchical networks between the transcriptional protein machinery and modified DNA are described. It is further demonstrated that ZNF24 and ZSCAN21 are potential readers of 5fC-modified DNA. This study provides a landscape of TF-DNA modification interactions that can be used to elucidate the epigenetic-related transcriptional regulation mechanisms under physiological conditions.
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Affiliation(s)
- Lin Bai
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Guojian Yang
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Zhaoyu Qin
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Jiacheng Lyu
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Yunzhi Wang
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Jinwen Feng
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Mingwei Liu
- State Key Laboratory of ProteomicsBeijing Proteome Research CenterNational Center for Protein Sciences (The PHOENIX Center, Beijing)Institute of LifeomicsBeijing102206China
| | - Tongqing Gong
- State Key Laboratory of ProteomicsBeijing Proteome Research CenterNational Center for Protein Sciences (The PHOENIX Center, Beijing)Institute of LifeomicsBeijing102206China
| | - Xianju Li
- State Key Laboratory of ProteomicsBeijing Proteome Research CenterNational Center for Protein Sciences (The PHOENIX Center, Beijing)Institute of LifeomicsBeijing102206China
| | - Zhengyang Li
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Jixi Li
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
| | - Jun Qin
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
- State Key Laboratory of ProteomicsBeijing Proteome Research CenterNational Center for Protein Sciences (The PHOENIX Center, Beijing)Institute of LifeomicsBeijing102206China
| | - Wenjun Yang
- Department of Pediatric OrthopedicsXin Hua Hospital AffiliatedShanghai Jiao Tong University School of MedicineShanghai200092China
| | - Chen Ding
- State Key Laboratory of Genetic Engineering and Collaborative Innovation Center for Genetics and DevelopmentSchool of Life SciencesInstitute of Biomedical SciencesHuman Phenome InstituteZhongshan HospitalFudan UniversityShanghai200433China
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Du J, He H, Li Z, He J, Bai Z, Liu B, Lan Y. Integrative transcriptomic analysis of developing hematopoietic stem cells in human and mouse at single-cell resolution. Biochem Biophys Res Commun 2021; 558:161-167. [PMID: 33930817 DOI: 10.1016/j.bbrc.2021.04.058] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 04/15/2021] [Indexed: 12/14/2022]
Abstract
Current understanding of hematopoietic stem cell (HSC) development comes from mouse models is considered to be evolutionarily conserved in human. However, the cross-species comparison of the transcriptomic profiles of developmental HSCs at single-cell level is still lacking. Here, we performed integrative transcriptomic analysis of a series of key cell populations during HSC development in human and mouse, including HSC-primed hemogenic endothelial cells and pre-HSCs in mid-gestational aorta-gonad-mesonephros (AGM) region, and mature HSCs in fetal liver and adult bone marrow. We demonstrated the general similarity of transcriptomic characteristics between corresponding cell populations of the two species. Of note, one of the previously transcriptomically defined hematopoietic stem progenitor cell (HSPC) populations with certain arterial characteristics in AGM region of human embryos showed close transcriptomic similarity to pre-HSCs in mouse embryos. On the other hand, the other two HSPC populations in human AGM region displayed molecular similarity with fetal liver HSPCs, suggesting the maturation in AGM before HSCs colonizing the fetal liver in human, which was different to that in mouse. Finally, we re-clustered cells based on the integrated dataset and illustrated the evolutionarily conserved molecular signatures of major cell populations. Our results revealed transcriptomic conservation of critical cell populations and molecular characteristics during HSC development between human and mouse, providing a resource and theoretic basis for future studies on mammalian HSC development and regeneration by using mouse models.
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Affiliation(s)
- Junjie Du
- State Key Laboratory of Proteomics, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing, 100850, China
| | - Han He
- State Key Laboratory of Proteomics, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing, 100850, China
| | - Zongcheng Li
- State Key Laboratory of Experimental Hematology, Institute of Hematology, Fifth Medical Center of Chinese PLA General Hospital, Beijing, 100071, China
| | - Jian He
- State Key Laboratory of Proteomics, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing, 100850, China
| | - Zhijie Bai
- State Key Laboratory of Proteomics, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing, 100850, China
| | - Bing Liu
- State Key Laboratory of Proteomics, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing, 100850, China; State Key Laboratory of Experimental Hematology, Institute of Hematology, Fifth Medical Center of Chinese PLA General Hospital, Beijing, 100071, China; Key Laboratory for Regenerative Medicine of Ministry of Education, Institute of Hematology, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, China.
| | - Yu Lan
- Key Laboratory for Regenerative Medicine of Ministry of Education, Institute of Hematology, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, China.
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Yang H, Jin L, Sun X. A thirteen‑gene set efficiently predicts the prognosis of glioblastoma. Mol Med Rep 2019; 19:1613-1621. [PMID: 30628650 PMCID: PMC6390043 DOI: 10.3892/mmr.2019.9801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Accepted: 09/06/2018] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma multiforme (GBM) is the most common type of brain cancer; it usually recurs and patients have a short survival time. The present study aimed to construct a gene expression classifier and to screen key genes associated with GBM prognosis. GSE7696 microarray data set included samples from 10 recurrent GBM tissues, 70 primary GBM tissues and 4 normal brain tissues. Seed genes were identified by the 'survival' package in R and subjected to pathway enrichment analysis. Prognostic genes were selected from the seed genes using the 'rbsurv' package in R, unsupervised hierarchical clustering, survival analysis and enrichment analysis. Multivariate survival analysis was performed for the prognostic genes, and the GBM data set from The Cancer Genome Atlas database was utilized to validate the prognostic genes. Of the 1,785 seed genes analyzed, 13 prognostic feature genes, including collagen type XXVIII α1 chain (COL28A1), PDS5 cohesin‑associated factor A (PDS5A), zinc‑finger DHHC‑type containing 2 (ZDHHC2), zinc‑finger protein 24 (ZNF24), myosin VA (MYO5A) and myeloid/lymphoid or mixed‑lineage leukemia translocated to 4 (MLLT4), were identified. These genes performed well on sample classification and prognostic risk differentiation, and six pathways, including adherens junction, cyclic adenosine 3',5'‑monophosphate signaling and Ras signaling pathways, were enriched for these feature genes. The high‑risk group was slightly older compared with the low‑risk group. The validation data set confirmed the prognostic value of the 13 feature genes for GBM; of these, COL28A1, PDS5A, ZDHHC2, ZNF24, MYO5A and MLLT4 may be crucial. These results may aid the understanding of the pathogenesis of GBM and provide important clues for the development of novel diagnostic markers or therapeutic targets.
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Affiliation(s)
- Huyin Yang
- Department of Neurosurgery, Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu 223300, P.R. China
| | - Luhao Jin
- Department of Neurosurgery, Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu 223300, P.R. China
| | - Xiaoyang Sun
- Department of Neurosurgery, Affiliated Huaian No. 1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu 223300, P.R. China
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Novel endogenous angiogenesis inhibitors and their therapeutic potential. Acta Pharmacol Sin 2015; 36:1177-90. [PMID: 26364800 PMCID: PMC4648174 DOI: 10.1038/aps.2015.73] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 07/27/2015] [Indexed: 12/17/2022] Open
Abstract
Angiogenesis, the formation of new blood vessels from the pre-existing vasculature is essential for embryonic development and tissue homeostasis. It also plays critical roles in diseases such as cancer and retinopathy. A delicate balance between pro- and anti-angiogenic factors ensures normal physiological homeostasis. Endogenous angiogenesis inhibitors are proteins or protein fragments that are formed in the body and have the ability to limit angiogenesis. Many endogenous angiogenesis inhibitors have been discovered, and the list continues to grow. Endogenous protein/peptide inhibitors are relatively less toxic, better tolerated and have a lower risk of drug resistance, which makes them attractive as drug candidates. In this review, we highlight ten novel endogenous protein angiogenesis inhibitors discovered within the last five years, including ISM1, FKBPL, CHIP, ARHGAP18, MMRN2, SOCS3, TAp73, ZNF24, GPR56 and JWA. Although some of these proteins have been well characterized for other biological functions, we focus on their new and specific roles in angiogenesis inhibition and discuss their potential for therapeutic application.
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Li JZ, Chen X, Gong XL, Hu HY, Shi D, Lu YM, Qiu L, Lu F, Hu ZL, Zhang JP. Identification of a functional nuclear localization signal mediating nuclear import of the zinc finger transcription factor ZNF24. PLoS One 2013; 8:e79910. [PMID: 24224020 PMCID: PMC3815127 DOI: 10.1371/journal.pone.0079910] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 09/26/2013] [Indexed: 02/05/2023] Open
Abstract
ZNF24 is a member of the SCAN domain family of Krüppel-like zinc finger (ZF) transcription factors, which plays a critical role in cell proliferation and differentiation. However, how ZNF24 enters the nucleus in order to exert its function remains unclear since its nuclear localization signal(s) (NLS) has not been identified. Here, we generated a series of GFP-tagged deletion and point mutants and assessed their subcellular localization. Our results delimit the NLS to ZF1-2. Deletion of ZF1-2 caused cytoplasmic accumulation of ZNF24. Fusion of the ZF1-2 to green fluorescent protein (GFP) targeted GFP to the nucleus, demonstrating that the ZF1-2 is both necessary and sufficient for nuclear localization. ZNF24 containing histidine to leucine mutations that disrupt the structure of ZF1 or/and ZF2 retains appropriate nuclear localization, indicating that neither the tertiary structure of the zinc fingers nor specific DNA binding are necessary for nuclear localization. K286A and R290A mutation led to partial cytoplasmic accumulation. Co-immunoprecipitation demonstrated that ZNF24 interacted with importin-β and this interaction required the ZF motifs. The β-Catenin (CTNNB1) luciferase assays showed that the ZNF24 mutants defective in nuclear localization could not promote CTNNB1promoter activation as the wild-type ZNF24 did. Taken together, these results suggest that consecutive ZF1-2 is critical for the regulation of ZNF24 nuclear localization and its transactivation function.
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Affiliation(s)
- Jian-Zhong Li
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
- * E-mail: (JZL); (JPZ)
| | - Xia Chen
- Cancer Institute, Second Military Medical University, Shanghai, China
| | - Xue-Lian Gong
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
- Department of Health Toxicology, Second Military Medical University, Shanghai, China
| | - Hong-Yuan Hu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Duo Shi
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Yi-Ming Lu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Lei Qiu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Fa Lu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Zhen-Lin Hu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Jun-Ping Zhang
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
- * E-mail: (JZL); (JPZ)
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Transcriptional repression of VEGF by ZNF24: mechanistic studies and vascular consequences in vivo. Blood 2012; 121:707-15. [PMID: 23212515 DOI: 10.1182/blood-2012-05-433045] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
VEGF is a key regulator of normal and pathologic angiogenesis. Although many trans-activating factors of VEGF have been described, the transcriptional repression of VEGF remains much less understood. We have previously reported the identification of a SCAN domain-containing C2H2 zinc finger protein, ZNF24, that represses the transcription of VEGF. In the present study, we identify the mechanism by which ZNF24 represses VEGF transcription. Using reporter gene and electrophoretic mobility shift assays, we identify an 11-bp fragment of the proximal VEGF promoter as the ZNF24-binding site that is essential for ZNF24-mediated repression. We demonstrate in 2 in vivo models the potent inhibitory effect of ZNF24 on the vasculature. Expression of human ZNF24 induced in vivo vascular defects consistent with those induced by VEGF knockdown using a transgenic zebrafish model. These defects could be rescued by VEGF overexpression. Overexpression of ZNF24 in human breast cancer cells also inhibited tumor angiogenesis in an in vivo tumor model. Analyses of human breast cancer tissues showed that ZNF24 and VEGF levels were inversely correlated in malignant compared with normal tissues. These data demonstrate that ZNF24 represses VEGF transcription through direct binding to an 11-bp fragment of the VEGF proximal promoter and that it functions as a negative regulator of tumor growth by inhibiting angiogenesis.
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Ren YR, Chaerkady R, Hu S, Wan J, Qian J, Zhu H, Pandey A, Kern SE. Unbiased discovery of interactions at a control locus driving expression of the cancer-specific therapeutic and diagnostic target, mesothelin. J Proteome Res 2012; 11:5301-10. [PMID: 23025254 DOI: 10.1021/pr300797v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although significant effort is expended on identifying transcripts/proteins that are up-regulated in cancer, there are few reports on systematic elucidation of transcriptional mechanisms underlying such druggable cancer-specific targets. The mesothelin (MSLN) gene offers a promising subject, being expressed in a restricted pattern normally, yet highly overexpressed in almost one-third of human malignancies and a target of cancer immunotherapeutic trials. CanScript, a cis promoter element, appears to control MSLN cancer-specific expression; its related genomic sequences may up-regulate other cancer markers. CanScript is a 20-nt bipartite element consisting of an SP1-like motif and a consensus MCAT sequence. The latter recruits TEAD (TEA domain) family members, which are universally expressed. Exploration of the active CanScript element, especially the proteins binding to the SP1-like motif, thus could reveal cancer-specific features having diagnostic or therapeutic interest. The efficient identification of sequence-specific DNA-binding proteins at a given locus, however, has lagged in biomarker explorations. We used two orthogonal proteomics approaches--unbiased SILAC (stable isotope labeling by amino acids in cell culture)/DNA affinity-capture/mass spectrometry survey (SD-MS) and a large transcription factor protein microarray (TFM)--and functional validation to explore systematically the CanScript interactome. SD-MS produced nine candidates, and TFM, 18. The screens agreed in confirming binding by TEAD proteins and by newly identified NAB1 and NFATc. Among other identified candidates, we found functional roles for ZNF24, NAB1 and RFX1 in MSLN expression by cancer cells. Combined interactome screens yield an efficient, reproducible, sensitive, and unbiased approach to identify sequence-specific DNA-binding proteins and other participants in disease-specific DNA elements.
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Affiliation(s)
- Yunzhao R Ren
- The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21231, USA
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Li J, Chen X, He J, Li M, Liu Y, Zi H, Hu Z, Zhang J. A yeast two‐hybrid screen identifies histone H2A.Z as a transcription factor ZNF24 interactor. J Cell Biochem 2012; 113:3411-8. [DOI: 10.1002/jcb.24217] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jianzhong Li
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Xia Chen
- Cancer Institute, Second Military Medical University, Shanghai, China
| | - Jielu He
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Mengwen Li
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Ying Liu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Haiyang Zi
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Zhenlin Hu
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
| | - Junping Zhang
- Department of Biochemical Pharmacy, Second Military Medical University, Shanghai, China
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