1
|
Ma Y, Deng X, Shen R, Zhang H, Qian Y. Unveiling immune tolerance pathways in preeclampsia placenta: implications for molecular targets and discovery of potential biomarkers. Front Endocrinol (Lausanne) 2024; 15:1385154. [PMID: 38894741 PMCID: PMC11182985 DOI: 10.3389/fendo.2024.1385154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 05/13/2024] [Indexed: 06/21/2024] Open
Abstract
During pregnancy, there is a link between disruption of maternal immune tolerance and preeclampsia, but the molecular mechanisms that regulate maternal and fetal immune tolerance remain unclear. This study employs bioinformatics to identify new markers related to placental immune tolerance and explore their potential role in predicting preeclampsia. Analyzing preeclampsia-related gene expression profiles in the Gene Expression Omnibus (GEO) dataset reveals 211 differentially expressed genes (DEGs) in the placenta, mainly influencing immune cell differentiation and response pathways. Employing weighted gene co-expression network analysis (WGCNA) and lasso regression, four potential target genes (ANKRD37, CRH, LEP, SIGLEC6) are identified for potential prediction of preeclampsia. Validation using the GSE4707 dataset confirmed the diagnostic and predictive potential of these candidate genes. RT-qPCR verified up-regulation in the placenta, while ELISA showed their correlation with immune tolerance factors associated with placental immune tolerance. As a result of this study, identifies potential biomarkers associated with placental immunity and contributes to understanding the molecular mechanism of preeclampsia.
Collapse
Affiliation(s)
- Yantuanjin Ma
- Institute of Biomedical Engineering, Kunming Medical University, Kunming, China
- Kunming Medical University, Kunming, China
| | - Xingli Deng
- Kunming Medical University, Kunming, China
- Department of Neurosurgery, The First Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Ru Shen
- Kunming Medical University, Kunming, China
| | - Hongqing Zhang
- Kunming Medical University, Kunming, China
- Clinical Medical Research Center for Obstetrics and Gynecology (Yunnan Joint Key Laboratory), Kunming City of Maternal and Child Health Hospital, Kunming City of Women and Children, Kunming, China
| | - Yuan Qian
- Kunming Medical University, Kunming, China
- Clinical Medical Research Center for Obstetrics and Gynecology (Yunnan Joint Key Laboratory), Kunming City of Maternal and Child Health Hospital, Kunming City of Women and Children, Kunming, China
| |
Collapse
|
2
|
Tan W, Fu H, Zhou X, Duan Y, Yin N, Huang J, Liu X. ANKRD37 inhibits trophoblast migration and invasion by regulating NF-κB pathway in preeclampsia. J Gene Med 2022; 24:e3416. [PMID: 35218282 DOI: 10.1002/jgm.3416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/30/2022] [Accepted: 02/23/2022] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Inadequate trophoblast invasion is associated with preeclampsia (PE). Ankyrin repeat domain protein 37 (ANKRD37) has been reported to be abnormally expressed in PE placentas. However, the role of ANKRD37 in trophoblasts has not been investigated. We aimed to determine the functions of ANKRD37 in PE and to explore the molecular mechanisms. METHODS Here, fluorescence in situ hybridization, immunohistochemistry, Western blotting and quantitative real-time PCR were used to detect protein and mRNA expression levels. Cell Counting Kit-8 (CCK-8), EdU assay, flow cytometry, wound healing assay, Transwell assay and RNA sequencing were performed to study the role of ANKRD37 and the underlying mechanism in HTR8/SVneo and JEG-3 cells, and extravillous explant cultures were used to evaluate the migration and invasion abilities of extravillous cytotrophoblasts (EVTs). RESULTS We found that ANKRD37 expression was upregulated in PE placentas compared to normal pregnancy placentas. ANKRD37 knockdown enhanced trophoblast migration and invasion, promoted extravillous explant outgrowth, and regulated the expression of key invasion proteins, while ANKRD37 overexpression exerted the opposite effects. RNA sequencing indicated that NF-κB was the potential downstream pathway of ANKRD37, which was confirmed by the change in p-p65 and p-IκBα expression in JEG-3 and HTR8/SVneo cells. CONCLUSIONS Our findings suggest that high expression of ANKRD37 inhibits trophoblast cell migration and invasion possibly via NF-κB pathway, and may be related to the development of PE.
Collapse
Affiliation(s)
- Wang Tan
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.,The Chongqing Key Laboratory of Translational Medicine in Major Metabolic Diseases, Chongqing, China
| | - Huijia Fu
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.,The Chongqing Key Laboratory of Translational Medicine in Major Metabolic Diseases, Chongqing, China
| | - Xiaobo Zhou
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yuhan Duan
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.,The Chongqing Key Laboratory of Translational Medicine in Major Metabolic Diseases, Chongqing, China
| | - Nanlin Yin
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jiayu Huang
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiru Liu
- Reproductive Medicine Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| |
Collapse
|
3
|
Zhao Z, Chen L, Cao M, Chen T, Huang Y, Wang N, Zhang B, Li F, Chen K, Yuan C, Li C, Zhou X. Comparison of lncRNA Expression in the Uterus between Periods of Embryo Implantation and Labor in Mice. Animals (Basel) 2022; 12:ani12030399. [PMID: 35158722 PMCID: PMC8833358 DOI: 10.3390/ani12030399] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/25/2022] [Accepted: 02/03/2022] [Indexed: 12/11/2022] Open
Abstract
Simple Summary Progesterone has been proven to play an important role in female mammals during pregnancy. In this study, the uteri of pregnant mice were collected to compare mRNA and lncRNA expression between periods of embryo implantation and labor. The results show that 19 known differentially expressed lncRNAs and 31 novel differentially lncRNAs were commonly expressed between the two stages, indicating that these lncRNAs’ function is related to progesterone. Abstract Uterine function during pregnancy is regulated mainly by progesterone (P4) and estrogen (E2). Serum P4 levels are known to fluctuate significantly over the course of pregnancy, especially during embryo implantation and labor. In this study, pregnant mice at E0.5, E4.5, E15.5, and E18.5 (n = 3/E) were used for an RNA-Seq-based analysis of mRNA and lncRNA expression. In this analysis, 1971 differentially expressed (DE) mRNAs, 493 known DE lncRNAs, and 1041 novel DE lncRNAs were found between E0.5 and E4.5 at the embryo implantation stage, while 1149 DE mRNAs, 192 known DE lncRNAs, and 218 novel DE lncRNAs were found between E15.5 and E18.5 at the labor stage. The expression level of lncRNA-MMP11 was significantly downregulated by P4 treatment on MSM cells, while lncRNA-ANKRD37 was significantly upregulated. Notably, 117 DE mRNAs, 19 known DE lncRNAs, and 31 novel DE lncRNAs were commonly expressed between the two stages, indicating that these mRNAs and lncRNAs may be directly or indirectly regulated by P4.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Xu Zhou
- Correspondence: (C.L.); (X.Z.)
| |
Collapse
|
4
|
Tamai K, Nakamura-Shima M, Shibuya-Takahashi R, Kanno SI, Yasui A, Mochizuki M, Iwai W, Wakui Y, Abue M, Yamamoto K, Miura K, Mizuma M, Unno M, Kawamura S, Sato I, Yasuda J, Yamaguchi K, Sugamura K, Satoh K. BEX2 suppresses mitochondrial activity and is required for dormant cancer stem cell maintenance in intrahepatic cholangiocarcinoma. Sci Rep 2020; 10:21592. [PMID: 33299012 PMCID: PMC7725823 DOI: 10.1038/s41598-020-78539-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 10/23/2020] [Indexed: 02/06/2023] Open
Abstract
Cancer stem cells (CSCs) define a subpopulation of cancer cells that are resistant to therapy. However, little is known of how CSC characteristics are regulated. We previously showed that dormant cancer stem cells are enriched with a CD274low fraction of cholangiocarcinoma cells. Here we found that BEX2 was highly expressed in CD274low cells, and that BEX2 knockdown decreased the tumorigenicity and G0 phase of cholangiocarcinoma cells. BEX2 was found to be expressed predominantly in G0 phase and starvation induced the USF2 transcriptional factor, which induced BEX2 transcription. Comprehensive screening of BEX2 binding proteins identified E3 ubiquitin ligase complex proteins, FEM1B and CUL2, and a mitochondrial protein TUFM, and further demonstrated that knockdown of BEX2 or TUFM increased mitochondria-related oxygen consumption and decreased tumorigenicity in cholangiocarcinoma cells. These results suggest that BEX2 is essential for maintaining dormant cancer stem cells through the suppression of mitochondrial activity in cholangiocarcinoma.
Collapse
Affiliation(s)
- Keiichi Tamai
- Division of Cancer Stem Cell, Miyagi Cancer Center Research Institute, 47-1 Nodayama, Medeshima-Shiode, Natori, Miyagi, 981-1293, Japan.
| | - Mao Nakamura-Shima
- Division of Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Rie Shibuya-Takahashi
- Division of Cancer Stem Cell, Miyagi Cancer Center Research Institute, 47-1 Nodayama, Medeshima-Shiode, Natori, Miyagi, 981-1293, Japan
| | - Shin-Ichiro Kanno
- IDAC Fellow Research Group for DNA Repair and Dynamic Proteome Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, 980-8575, Japan
| | - Akira Yasui
- IDAC Fellow Research Group for DNA Repair and Dynamic Proteome Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, 980-8575, Japan
| | - Mai Mochizuki
- Division of Cancer Stem Cell, Miyagi Cancer Center Research Institute, 47-1 Nodayama, Medeshima-Shiode, Natori, Miyagi, 981-1293, Japan
| | - Wataru Iwai
- Department of Gastroenterology, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Yuta Wakui
- Department of Gastroenterology, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Makoto Abue
- Department of Gastroenterology, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Kuniharu Yamamoto
- Department of Surgery, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan.,Division of Hepatobiliary and Pancreatic Surgery, Tohoku Medical and Pharmaceutical University, 1-15-1, Fukumuro, Miyagino-ku, Sendai, Miyagi, Japan
| | - Koh Miura
- Department of Surgery, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Masamichi Mizuma
- Department of Surgery, Tohoku University Graduate School of Medicine, 1-1, Seiryo-cho, Aoba-ku, Sendai, Miyagi, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University Graduate School of Medicine, 1-1, Seiryo-cho, Aoba-ku, Sendai, Miyagi, Japan
| | - Sadafumi Kawamura
- Department of Urology, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Ikuro Sato
- Department of Pathology, Miyagi Cancer Center, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Jun Yasuda
- Division of Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Kazunori Yamaguchi
- Division of Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Kazuo Sugamura
- Division of Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, 47-1, Medeshima-Shiode, Natori, Miyagi, Japan
| | - Kennichi Satoh
- Division of Cancer Stem Cell, Miyagi Cancer Center Research Institute, 47-1 Nodayama, Medeshima-Shiode, Natori, Miyagi, 981-1293, Japan.,Division of Gastroenterology, Tohoku Medical and Pharmaceutical University, 1-15-1, Fukumuro, Miyagino-ku, Sendai, Miyagi, Japan
| |
Collapse
|
5
|
Deng M, Zhang W, Yuan L, Tan J, Chen Z. HIF-1a regulates hypoxia-induced autophagy via translocation of ANKRD37 in colon cancer. Exp Cell Res 2020; 395:112175. [PMID: 32679233 DOI: 10.1016/j.yexcr.2020.112175] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/24/2020] [Accepted: 07/08/2020] [Indexed: 01/01/2023]
Abstract
Autophagy is a basic catabolic response that eukaryotic cells use to degrade unnecessary or dysfunctional cellular components in an orderly and regulated manner. It plays important roles in maintaining cellular homeostasis, energy homeostasis, response to environmental stimuli, and the development of cancer. In solid tumors, hypoxia induces an increased HIF-1a that activates autophagy. However, the exact mechanism by which induced HIF-1a stimulates autophagy in cancer cells remains elusive. In the present study, we confirmed that ANKRD37 is upregulated in colon cancer tissue. Moreover, the higher expression level of ANKRD37 is related to a poorer survival rate. Using RNA interference, immunoblot, and immunofluorescence, we discovered that in cancer cell line RKO, hypoxia-induced HIF-1a regulates autophagy activity by increasing ANKRD37 level. In addition, intranuclear ANKRD37 played an important role in the regulation of hypoxia-induced autophagy. The translocation of ANKRD37 into cell nuclear is required for promoting cell growth and HIF-1a induced autophagy. These findings provide new insights to understand the hypoxia regulation mechanisms and the role of autophagy in cancer development.
Collapse
Affiliation(s)
- Minzi Deng
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Weizhi Zhang
- Department of Cardiovascular Surgery, The Second Xiangya Hospital of CentralSouth University, Changsha, Hunan, China
| | - Lingling Yuan
- Taihe Hospital, Hubei University of Medicine, Hubei, 442000, China
| | - Jieqiong Tan
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
| | - Zhihong Chen
- Department of Pathology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China.
| |
Collapse
|
6
|
Liu X, Zurlo G, Zhang Q. The Roles of Cullin-2 E3 Ubiquitin Ligase Complex in Cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1217:173-186. [PMID: 31898228 DOI: 10.1007/978-981-15-1025-0_11] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Posttranslational protein modifications play an important role in regulating protein stability and cellular function. There are at least eight Cullin family members. Among them, Cullin-2 forms a functional E3 ligase complex with elongin B, elongin C, RING-box protein 1 (RBX1, also called ROC1), as well as the substrate recognition subunit (SRS) to promote the substrate ubiquitination and degradation. In this book chapter, we will review Cullin-2 E3 ligase complexes that include various SRS proteins, including von Hippel Lindau (pVHL), leucine-rich repeat protein-1 (LRR-1), preferentially expressed antigen of melanoma (PRAME), sex-determining protein FEM-1 and early embryogenesis protein ZYG-11. We will focus on the VHL signaling pathway in clear cell renal cell carcinoma (ccRCC), which may reveal various therapeutic avenues in treating this lethal cancer.
Collapse
Affiliation(s)
- Xijuan Liu
- Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - Giada Zurlo
- Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC, USA.,Department of Pathology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Qing Zhang
- Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC, USA. .,Department of Pharmacology, University of North Carolina, Chapel Hill, NC, USA. .,Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC, USA. .,Department of Pathology, UT Southwestern Medical Center, Dallas, TX, USA.
| |
Collapse
|
7
|
Hernández-Montiel W, Collí-Dula RC, Ramón-Ugalde JP, Martínez-Núñez MA, Zamora-Bustillos R. RNA-seq Transcriptome Analysis in Ovarian Tissue of Pelibuey Breed to Explore the Regulation of Prolificacy. Genes (Basel) 2019; 10:E358. [PMID: 31083386 PMCID: PMC6562736 DOI: 10.3390/genes10050358] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 04/18/2019] [Accepted: 04/26/2019] [Indexed: 12/31/2022] Open
Abstract
The Pelibuey sheep (Ovis aries) is an indigenous breed distributed in the tropical regions of Mexico. The prolificacy of this sheep is on average from 1 to 1.5 lambs, being an important breeding characteristic that owners seek to increase with the purpose of economic improvements. New-generation RNA sequencing technology has been used to identify the genes that are expressed in the ovarian tissue of sheep that have two or more lambs per parturition, as well as to elucidate the metabolic pathways that are affected by the expression of these genes, with the purpose of better understanding the prolificacy in the sheep. In the present study, the transcriptional expression of multiparous and uniparous sheep was compared using RNA sequencing. Multiparous (M group) and uniparous (U group) sheep that had a genealogical record for three generations (M, n = 5 and U, n = 5) were selected. RNA was extracted from ovarian tissue and subsequently used to prepare the libraries that were sequenced using the Illumina NextSeq500 platform. A total of 31,575 genes were detected from the transcriptomic analysis of which 4908 were significantly expressed (p-value ≤ 0.001) in the ovary of sheep. Subsequently, a second filter was carried out to evaluate the false discovery rate (FDR) and select those genes with p-values ≤ 0.05 and values of expression ≥ 1 (log2), obtaining 354 differential expressed genes (DEG): 120 genes up-regulated and 234 genes down-regulated in the group M with respect to the group U. Through Gene Ontology (GO) and metabolic analysis, we obtained information on the function of differentially expressed genes, and its importance in the reproduction of multiparous sheep. This result suggest that genes identified in the present study participate in the development of the final stages of follicles.
Collapse
Affiliation(s)
- Wilber Hernández-Montiel
- División de Estudios de Posgrado e Investigación, TecNM/Instituto Tecnológico de Conkal, Av. Tecnológico S/N, Conkal, Yucatán 97345, Mexico.
| | | | - Julio Porfirio Ramón-Ugalde
- División de Estudios de Posgrado e Investigación, TecNM/Instituto Tecnológico de Conkal, Av. Tecnológico S/N, Conkal, Yucatán 97345, Mexico.
| | - Mario Alberto Martínez-Núñez
- UMDI-Sisal, Facultad de Ciencias, Universidad Nacional Autónoma de México, Sierra Papacal-Chuburna Km 5, Mérida, Yucatán 97302, Mexico.
| | - Roberto Zamora-Bustillos
- División de Estudios de Posgrado e Investigación, TecNM/Instituto Tecnológico de Conkal, Av. Tecnológico S/N, Conkal, Yucatán 97345, Mexico.
| |
Collapse
|
8
|
Jang SM, Redon CE, Aladjem MI. Chromatin-Bound Cullin-Ring Ligases: Regulatory Roles in DNA Replication and Potential Targeting for Cancer Therapy. Front Mol Biosci 2018; 5:19. [PMID: 29594129 PMCID: PMC5859106 DOI: 10.3389/fmolb.2018.00019] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 02/12/2018] [Indexed: 12/14/2022] Open
Abstract
Cullin-RING (Really Interesting New Gene) E3 ubiquitin ligases (CRLs), the largest family of E3 ubiquitin ligases, are functional multi-subunit complexes including substrate receptors, adaptors, cullin scaffolds, and RING-box proteins. CRLs are responsible for ubiquitination of ~20% of cellular proteins and are involved in diverse biological processes including cell cycle progression, genome stability, and oncogenesis. Not surprisingly, cullins are deregulated in many diseases and instances of cancer. Recent studies have highlighted the importance of CRL-mediated ubiquitination in the regulation of DNA replication/repair, including specific roles in chromatin assembly and disassembly of the replication machinery. The development of novel therapeutics targeting the CRLs that regulate the replication machinery and chromatin in cancer is now an attractive therapeutic strategy. In this review, we summarize the structure and assembly of CRLs and outline their cellular functions and their diverse roles in cancer, emphasizing the regulatory functions of nuclear CRLs in modulating the DNA replication machinery. Finally, we discuss the current strategies for targeting CRLs against cancer in the clinic.
Collapse
Affiliation(s)
| | | | - Mirit I. Aladjem
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States
| |
Collapse
|
9
|
Wang S, Xia W, Qiu M, Wang X, Jiang F, Yin R, Xu L. Atlas on substrate recognition subunits of CRL2 E3 ligases. Oncotarget 2018; 7:46707-46716. [PMID: 27107416 PMCID: PMC5216831 DOI: 10.18632/oncotarget.8732] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 04/02/2016] [Indexed: 12/16/2022] Open
Abstract
The Cullin2-type ubiquitin ligases belong to the Cullin-Ring Ligase (CRL) family, which is a crucial determinant of proteasome-based degradation processes in eukaryotes. Because of the finding of von Hippel-Lindau tumor suppressor (VHL), the Cullin2-type ubiquitin ligases gain focusing in the research of many diseases, especially in tumors. These multisubunit enzymes are composed of the Ring finger protein, the Cullin2 scaffold protein, the Elongin B&C linker protein and the variant substrate recognition subunits (SRSs), among which the Cullin2 scaffold protein is the determining factor of the enzyme mechanism. Substrate recognition of Cullin2-type ubiquitin ligases depends on SRSs and results in the degradation of diseases associated substrates by intracellular signaling events. This review focuses on the diversity and the multifunctionality of SRSs in the Cullin2-type ubiquitin ligases, including VHL, LRR-1, FEM1b, PRAME and ZYG11. Recently, as more SRSs are being discovered and more aspects of substrate recognition have been illuminated, insight into the relationship between Cul2-dependent SRSs and substrates provides a new area for cancer research.
Collapse
Affiliation(s)
- Siwei Wang
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China.,The Fourth Clinical College of Nanjing Medical University, Nanjing, China
| | - Wenjia Xia
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China.,The Fourth Clinical College of Nanjing Medical University, Nanjing, China
| | - Mantang Qiu
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China.,The Fourth Clinical College of Nanjing Medical University, Nanjing, China
| | - Xin Wang
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China.,The Fourth Clinical College of Nanjing Medical University, Nanjing, China
| | - Feng Jiang
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China
| | - Rong Yin
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China
| | - Lin Xu
- Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Key Laboratory of Molecular and Translational Cancer Research, Cancer Institute of Jiangsu Province, Nanjing, China
| |
Collapse
|
10
|
Tang WH, Zhuang XJ, Song SD, Wu H, Zhang Z, Yang YZ, Zhang HL, Mao JM, Liu DF, Zhao LM, Lin HC, Hong K, Ma LL, Qiao J, Qin W, Tang Y, Jiang H. Ran-binding protein M is associated with human spermatogenesis and oogenesis. Mol Med Rep 2017; 17:2257-2262. [PMID: 29207172 PMCID: PMC5783472 DOI: 10.3892/mmr.2017.8147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Accepted: 10/06/2017] [Indexed: 12/02/2022] Open
Abstract
The aim of the present study was to explore the underlying mechanism and diagnostic potential of Ran-binding protein M (RanBPM) in human spermatogenesis and oogenesis. RanBPM expression in human testis and ovaries was analysed using polymerase chain reaction (PCR) and western blotting, and immunofluorescence was performed on testis and ovary tissue sections during different developmental stages of spermatogenesis and oogenesis using RanBPM antibodies. Interactions with a variety of functional proteins were also investigated. RanBPM mRNA and protein expression levels were determined by PCR and western blotting in the tissue sections. Results revealed that the mRNA expression levels were highest in the testis followed by the ovary. The RanBPM protein was predominantly localized in the nucleus of germ cells, and the expression levels were highest in pachytene spermatocytes and cells surrounding spermatids in testis tissue. In ovary cells, RanBPM was localized in the nucleus and cytoplasm. In conclusion, the results suggested that RanBPM may have multiple roles in the regulation of germ cell proliferation during human spermatogenesis and oogenesis. This research may provide a novel insight into the underlying molecular mechanism of RanBPM and may have implications for the clinical diagnosis and treatment of human infertility.
Collapse
Affiliation(s)
- Wen-Hao Tang
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Xin-Jie Zhuang
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Shi-De Song
- Department of Urology, Rizhao People's Hospital, Rizhao, Shandong 276500, P.R. China
| | - Han Wu
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Zhe Zhang
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Yu-Zhuo Yang
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Hong-Liang Zhang
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Jia-Ming Mao
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital, Beijing 100191, P.R. China
| | - De-Feng Liu
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Lian-Ming Zhao
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Hao-Cheng Lin
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Kai Hong
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Lu-Lin Ma
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| | - Jie Qiao
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Weibing Qin
- Key Laboratory of Male Reproduction and Genetics, National Health and Family Planning Commission, Family Planning Research Institute of Guangdong Province, Guangzhou, Guangdong 510600, P.R. China
| | - Yunge Tang
- Key Laboratory of Male Reproduction and Genetics, National Health and Family Planning Commission, Family Planning Research Institute of Guangdong Province, Guangzhou, Guangdong 510600, P.R. China
| | - Hui Jiang
- 1Department of Urology, The Third Hospital of Peking University, Beijing 100191, P.R. China
| |
Collapse
|
11
|
Dankert JF, Pagan JK, Starostina NG, Kipreos ET, Pagano M. FEM1 proteins are ancient regulators of SLBP degradation. Cell Cycle 2017; 16:556-564. [PMID: 28118078 DOI: 10.1080/15384101.2017.1284715] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
FEM1A, FEM1B, and FEM1C are evolutionarily-conserved VHL-box proteins, the substrate recognition subunits of CUL2-RING E3 ubiquitin ligase complexes. Here, we report that FEM1 proteins are ancient regulators of Stem-Loop Binding Protein (SLBP), a conserved protein that interacts with the stem loop structure located in the 3' end of canonical histone mRNAs and functions in mRNA cleavage, translation and degradation. SLBP levels are highest during S-phase coinciding with histone synthesis. The ubiquitin ligase complex SCFcyclin F targets SLBP for degradation in G2 phase; however, the regulation of SLBP during other stages of the cell cycle is poorly understood. We provide evidence that FEM1A, FEM1B, and FEM1C interact with and mediate the degradation of SLBP. Cyclin F, FEM1A, FEM1B and FEM1C all interact with a region in SLBP's N-terminus using distinct degrons. An SLBP mutant that is unable to interact with all 4 ligases is expressed at higher levels than wild type SLBP and does not oscillate during the cell cycle. We demonstrate that orthologues of SLBP and FEM1 proteins interact in C. elegans and D. melanogaster, suggesting that the pathway is evolutionarily conserved. Furthermore, we show that FEM1 depletion in C. elegans results in the upregulation of SLBP ortholog CDL-1 in oocytes. Notably, cyclin F is absent in flies and worms, suggesting that FEM1 proteins play an important role in SLBP targeting in lower eukaryotes.
Collapse
Affiliation(s)
- John F Dankert
- a Department of Biochemistry and Molecular Pharmacology , New York University, School of Medicine , New York , NY , USA.,b Perlmutter NYU Cancer Center , New York University, School of Medicine , New York , NY , USA
| | - Julia K Pagan
- a Department of Biochemistry and Molecular Pharmacology , New York University, School of Medicine , New York , NY , USA.,b Perlmutter NYU Cancer Center , New York University, School of Medicine , New York , NY , USA.,c Howard Hughes Medical Institute, New York University School of Medicine , New York , NY , USA
| | | | - Edward T Kipreos
- d Department of Cellular Biology , University of Georgia , Athens , GA , USA
| | - Michele Pagano
- a Department of Biochemistry and Molecular Pharmacology , New York University, School of Medicine , New York , NY , USA.,b Perlmutter NYU Cancer Center , New York University, School of Medicine , New York , NY , USA.,c Howard Hughes Medical Institute, New York University School of Medicine , New York , NY , USA
| |
Collapse
|
12
|
Zhuang XJ, Tang WH, Feng X, Liu CY, Zhu JL, Yan J, Liu DF, Liu P, Qiao J. Trim27 interacts with Slx2, is associated with meiotic processes during spermatogenesis. Cell Cycle 2016; 15:2576-2584. [PMID: 27612028 DOI: 10.1080/15384101.2016.1174796] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
ABSTARCT Formation of the XY body is believed to prevent recombination between X and Y chromosomes during meiosis. We recently demonstrated that SYCP3-like X-linked 2 (Slx2) could be involved in synaptonemal complex formation as well as XY body maintenance during meiosis. In order to further investigate the role and composition of XY body protein complexes in meiotic processes and spermatogenesis, a yeast 2-hybrid screening was performed, and the tripartite motif protein 27(Trim27) was found to interact with Slx2 and co-localized in the XY body. Trim27 has a tripartite motif (TRIM) consisting of a RING finger, B-box and coiled-coil domains, and is a transcriptional regulator that is expressed in various tumor cell lines. In this study, we showed that Slx2 and Trim27 were highly expressed in meiosis of mouse testis. And the Slx2/Trim27 interaction was confirmed in vivo by co-immunoprecipitation and mammalian 2-hybrid interaction assays. Moreover, cytoimmuno localization experiments revealed that Slx2/Trim27 was co-localized to the XY body of spermatocytes during meiosis, and immunohistochemical results revealed co-localization of Trim27 and γ-H2AX in the XY body of primary spermatocytes in the mouse testis. Trim27 may therefore be a transcriptional regulation protein connecting Slx2 and γ-H2AX, thereby promoting the formation of a more potent XY body protein complex in meiotic processes and spermatogenesis. In conclusion, Trim27 connecting Slx2 may regulate meiotic processes in multiple ways by influencing XY body formation and germ cell proliferation during spermatogenesis.
Collapse
Affiliation(s)
- Xin-Jie Zhuang
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| | - Wen-Hao Tang
- b Department of Urology , the Third Hospital of Peking University , Beijing , PR China
| | - Xue Feng
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| | - Chang-Yu Liu
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| | - Jin-Liang Zhu
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| | - Jie Yan
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| | - De-Feng Liu
- b Department of Urology , the Third Hospital of Peking University , Beijing , PR China
| | - Ping Liu
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| | - Jie Qiao
- a Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Key Laboratory of Assisted Reproduction, Ministry of Education, Peking University Third Hospital , Beijing , PR China
| |
Collapse
|
13
|
Cai W, Yang H. The structure and regulation of Cullin 2 based E3 ubiquitin ligases and their biological functions. Cell Div 2016; 11:7. [PMID: 27222660 PMCID: PMC4878042 DOI: 10.1186/s13008-016-0020-7] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 05/11/2016] [Indexed: 11/23/2022] Open
Abstract
Background Cullin-RING E3 ubiquitin ligase complexes play a central role in targeting cellular proteins for ubiquitination-dependent protein turnover through 26S proteasome. Cullin-2 is a member of the Cullin family, and it serves as a scaffold protein for Elongin B and C, Rbx1 and various substrate recognition receptors to form E3 ubiquitin ligases. Main body of the abstract First, the composition, structure and the regulation of Cullin-2 based E3 ubiquitin ligases were introduced. Then the targets, the biological functions of complexes that use VHL, Lrr-1, Fem1b, Prame, Zyg-11, BAF250, Rack1 as substrate targeting subunits were described, and their involvement in diseases was discussed. A small molecule inhibitor of Cullins as a potential anti-cancer drug was introduced. Furthermore, proteins with VHL box that might bind to Cullin-2 were described. Finally, how different viral proteins form E3 ubiquitin ligase complexes with Cullin-2 to counter host viral defense were explained. Conclusions Cullin-2 based E3 ubiquitin ligases, using many different substrate recognition receptors, recognize a number of substrates and regulate their protein stability. These complexes play critical roles in biological processes and diseases such as cancer, germline differentiation and viral defense. Through the better understanding of their biology, we can devise and develop new therapeutic strategies to treat cancers, inherited diseases and viral infections.
Collapse
Affiliation(s)
- Weijia Cai
- Department of Pathology and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107 USA
| | - Haifeng Yang
- Department of Pathology and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107 USA
| |
Collapse
|
14
|
Ma KY, Liu ZQ, Lin JY, Li JL, Qiu GF. Molecular characterization of a novel ovary-specific gene fem-1 homolog from the oriental river prawn, Macrobrachium nipponense. Gene 2015; 575:244-52. [PMID: 26367327 DOI: 10.1016/j.gene.2015.08.070] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Revised: 08/16/2015] [Accepted: 08/31/2015] [Indexed: 01/23/2023]
Abstract
The feminization-1 (fem-1) gene is characterized by one of the most common protein-protein interaction motifs, ankyrin repeat motifs, displays many expression patterns in vertebrates and invertebrates, and plays an essential role in the sex-determination/differentiation pathway in Caenorhabditis elegans. In this study, a fem-1 homolog, designated as Mnfem-1, was first cloned from the oriental river prawn Macrobrachium nipponense. The prawn Mnfem-1 gene consists of six exons and five introns. The full-length cDNA (2603bp) of Mnfem-1 contains an open reading frame (ORF) encoding a protein of 622 amino acids. The Mnfem-1 RNA and protein are exclusively expressed in the ovary in adult prawns as revealed by RT-PCR and immunofluorescence analysis, respectively. In situ hybridization results showed that strong positive signals were concentrated at the edge of the previtellogenic and vitellogenic oocyte. During embryogenesis, Mnfem-1 is highly expressed in both unfertilized eggs and embryos at cleavage stage and thereafter dropped to a low level from blastula to zoea, indicating that the Mnfem-1 in early embryos is maternal. After hatching, the Mnfem-1 expression significantly increased in the larvae at length of 2cm, an important stage of sex differentiation. Yeast two hybridization results showed that the Mnfem-1 protein can be potentially interactive with cathepsin L and proteins containing the domains of insulinase, ankyrin or ubiquitin. Our results suggested that Mnfem-1 could have roles in prawn ovarian development and sex determination/differentiation.
Collapse
Affiliation(s)
- Ke-Yi Ma
- Key Laboratory of Freshwater Aquatic Genetic Resources Certificated by Ministry of Agriculture, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, PR China
| | - Zhi-Qiang Liu
- Key Laboratory of Freshwater Aquatic Genetic Resources Certificated by Ministry of Agriculture, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, PR China
| | - Jing-Yun Lin
- Key Laboratory of Freshwater Aquatic Genetic Resources Certificated by Ministry of Agriculture, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, PR China
| | - Jia-Le Li
- Key Laboratory of Freshwater Aquatic Genetic Resources Certificated by Ministry of Agriculture, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, PR China; E-Institute of Shanghai Universities, Shanghai Ocean University, Shanghai 201306, PR China.
| | - Gao-Feng Qiu
- Key Laboratory of Freshwater Aquatic Genetic Resources Certificated by Ministry of Agriculture, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, PR China; E-Institute of Shanghai Universities, Shanghai Ocean University, Shanghai 201306, PR China.
| |
Collapse
|
15
|
Identification and Characterization of Xlr5c as a Novel Nuclear Localization Protein in Mouse Germ Cells. PLoS One 2015; 10:e0130087. [PMID: 26075718 PMCID: PMC4468186 DOI: 10.1371/journal.pone.0130087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 05/15/2015] [Indexed: 11/19/2022] Open
Abstract
Background Spermatogenesis is the complex process by which diploid stem cells generate haploid germ cells in gamete production. Members of the Xlr (X-chromosome linked, lymphocyte regulated) superfamily play essential roles in spermatogenesis. The expression, localization and role in spermatogenesis of one such member, Xlr5c, has not been reported previously. Methodology/Principal Findings Xlr5c mRNA and protein levels in murine testes and other tissues were investigated using RT-PCR and Western blotting. Xlr5c was abundantly transcribed in mouse testes, particularly during the early stages of spermatogenesis and throughout prophase I in the nuclei of spermatocytes. Xlr5c was specifically localized at synaptonemal complexes(SCs) region in preleptotene and pachytene spermatocytes, as was the homologous Xlr protein Sycp3. Conclusions/Significance These results suggest that Xlr5c was abundantly transcribed in germ cells, localized at SCs region, where it may play a potential role during the early stages of spermatogenesis. Identification and characterization of this novel testis protein may offer a new perspective for understanding of the molecular mechanisms involved in germ cell differentiation.
Collapse
|
16
|
Zhuang XJ, Shi YQ, Xu B, Chen L, Tang WH, Huang J, Lian Y, Liu P, Qiao J. SLX2 interacting with BLOS2 is differentially expressed during mouse oocyte meiotic maturation. Cell Cycle 2014; 13:2231-7. [PMID: 24870619 DOI: 10.4161/cc.29265] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Gametogenesis is a complex biological process of producing cells for sexual reproduction. Xlr super family members containing a conserved COR1 domain play essential roles in gametogenesis. In the present study, we identified that Slx2, a novel member of Xlr super family, is specifically expressed in the meiotic oocytes, which is demonstrated by western blotting and immunohistochemistry studies. In the first meiotic prophase, SLX2 is unevenly distributed in the nuclei of oocytes, during which phase SLX2 is partly co-localized with SYCP3 in synaptonemal complex and γH2AX in the nucleus of oocytes. Interestingly, the localization of SLX2 was found to be switched into the cytoplasm of oocytes after prometaphase I during oocyte maturation. Furthermore, yeast two-hybrid and coimmunoprecipitation studies demonstrated that SLX2 interacts with BLOS2, which is a novel centrosome-associated protein, and co-localized with γ-Tubulin, which is a protein marker of chromosome segregation in meiosis. These results indicated that SLX2 might get involved in chromosomes segregation during meiosis by interaction with BLOS2. In conclusion, SLX2 might be a novel gametogenesis-related protein that could play multiple roles in regulation of meiotic processes including synaptonemal complex assembly and chromosome segregation.
Collapse
Affiliation(s)
- Xin-Jie Zhuang
- Center for Reproductive Medicine; Department of Obstetrics and Gynecology; Key Laboratory of Assisted Reproduction; Ministry of Education; Peking University Third Hospital; Beijing, PR China
| | - Yu-Qiang Shi
- College of Bio-Engineering; Weifang University; Weifang, PR China
| | - Bo Xu
- Center for Reproductive Medicine; Anhui Provincial Hospital Affiliated to Anhui Medical University; Hefei, PR China
| | - Lei Chen
- Reproductive Medical Centre; First Affiliated Hospital of Zhengzhou University; Zhengzhou, PR China
| | - Wen-Hao Tang
- Department of Urology; the Third Hospital of Peking University; Beijing, PR China
| | - Jin Huang
- Center for Reproductive Medicine; Department of Obstetrics and Gynecology; Key Laboratory of Assisted Reproduction; Ministry of Education; Peking University Third Hospital; Beijing, PR China
| | - Ying Lian
- Center for Reproductive Medicine; Department of Obstetrics and Gynecology; Key Laboratory of Assisted Reproduction; Ministry of Education; Peking University Third Hospital; Beijing, PR China
| | - Ping Liu
- Center for Reproductive Medicine; Department of Obstetrics and Gynecology; Key Laboratory of Assisted Reproduction; Ministry of Education; Peking University Third Hospital; Beijing, PR China
| | - Jie Qiao
- Center for Reproductive Medicine; Department of Obstetrics and Gynecology; Key Laboratory of Assisted Reproduction; Ministry of Education; Peking University Third Hospital; Beijing, PR China
| |
Collapse
|
17
|
Gilder AS, Chen YB, Jackson RJ, Jiang J, Maher JF. Fem1b promotes ubiquitylation and suppresses transcriptional activity of Gli1. Biochem Biophys Res Commun 2013; 440:431-6. [PMID: 24076122 DOI: 10.1016/j.bbrc.2013.09.090] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 09/17/2013] [Indexed: 02/07/2023]
Abstract
The mammalian Fem1b gene encodes a homolog of FEM-1, a protein in the sex-determination pathway of the nematode Caenorhabditis elegans. Fem1b and FEM-1 proteins each contain a VHL-box motif that mediates their interaction with certain E3 ubiquitin ligase complexes. In C. elegans, FEM-1 negatively regulates the transcription factor TRA-1, and functions as an E3 ubiquitin ligase substrate recognition subunit to target TRA-1 for ubiquitylation. TRA-1 is homologous to the mammalian Gli1 protein, a transcription factor that mediates Hedgehog signaling as well as having Hedgehog-independent functions. Whether the interaction between nematode FEM-1 and TRA-1 proteins is conserved, between corresponding mammalian homologs, has not been reported. Herein, we show that Fem1b interacts with Gli1 within cells, and directly binds Gli1. Fem1b also promotes ubiquitylation of Gli1, suppresses transcriptional activation by Gli1, and attenuates an oncogenic Gli1 autoregulatory loop in cancer cells, all dependent on the VHL-box of Fem1b. These findings have implications for understanding the cellular functions of Fem1b, and the regulation of Gli1 oncoprotein activity.
Collapse
Affiliation(s)
- Andrew S Gilder
- Cancer Institute and Department of Medicine, University of Mississippi Medical Center, Jackson, MS 39216, United States
| | | | | | | | | |
Collapse
|
18
|
Okumura F, Matsuzaki M, Nakatsukasa K, Kamura T. The Role of Elongin BC-Containing Ubiquitin Ligases. Front Oncol 2012; 2:10. [PMID: 22649776 PMCID: PMC3355856 DOI: 10.3389/fonc.2012.00010] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 01/17/2012] [Indexed: 02/06/2023] Open
Abstract
The Elongin complex was originally identified as a positive regulator of RNA polymerase II and is composed of a transcriptionally active subunit (A) and two regulatory subunits (B and C). The Elongin BC complex enhances the transcriptional activity of Elongin A. “Classical” SOCS box-containing proteins interact with the Elongin BC complex and have ubiquitin ligase activity. They also interact with the scaffold protein Cullin (Cul) and the RING domain protein Rbx and thereby are members of the Cullin RING ligase (CRL) superfamily. The Elongin BC complex acts as an adaptor connecting Cul and SOCS box proteins. Recently, it was demonstrated that classical SOCS box proteins can be further divided into two groups, Cul2- and Cul5-type proteins. The classical SOCS box-containing protein pVHL is now classified as a Cul2-type protein. The Elongin BC complex containing CRL family is now considered two distinct protein assemblies, which play an important role in regulating a variety of cellular processes such as tumorigenesis, signal transduction, cell motility, and differentiation.
Collapse
Affiliation(s)
- Fumihiko Okumura
- Division of Biological Science, Graduate School of Science, Nagoya University Nagoya, Aichi, Japan
| | | | | | | |
Collapse
|