1
|
Wu XH, Lin SZ, Liu ZX, Qi YF, Wang WQ, Li JY, Chen QD, Yang LL. A case of West syndrome and global developmental delay in a child with a heterozygous mutation in the TBL1XR1 gene: A case report. Medicine (Baltimore) 2023; 102:e33744. [PMID: 37171308 PMCID: PMC10174347 DOI: 10.1097/md.0000000000033744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/13/2023] Open
Abstract
BACKGROUND TBL1XR1, also known as IRA1 or TBLR1, encodes a protein that is localized in the nucleus and is expressed in most tissues. TBL1XR1 binds to histones H2B and H4 in vitro and functions in nuclear receptor-mediated transcription. TBL1XR1 is also involved in the regulation of the Wnt-β-catenin signaling pathway. Mutations in the TBL1XR1 gene impair the Wnt-β-catenin signaling pathway's ability to recruit Wnt-responsive element chromatin, affecting brain development. Mutations in this gene cause various clinical phenotypes, including Pierpont syndrome, autism spectrum disorder, speech and motor delays, mental retardation, facial dysmorphism, hypotonia, microcephaly, and hearing impairment. CASE SUMMARY A 5-month-old female child was admitted with "episodic limb tremors for more than 1 month." At the time of admission, the child had recurrent episodes of limb tremors with motor retardation and a partially atypical and hypsarrhythmic video electroencephalogram. It was determined that a heterozygous mutation in the TBL1XR1 gene caused West syndrome and global developmental delay. Recurrent episodes persisted for 6 months following oral treatment with topiramate; the addition of oral treatment with vigabatrin did not show any significant improvement, and the disease continued to recur. The child continued to have recurrent episodes of limb tremors at follow-up until 1 year and 3 months of age. Additionally, she developed poor eye contact and a poor response to name-calling. CONCLUSION We report the case of a child with West syndrome and a global developmental delay caused by a heterozygous mutation in the TBL1XR1 gene. This study adds to our understanding of the clinical phenotype of TBL1XR1 mutations and provides a realistic and reliable basis for clinicians.
Collapse
Affiliation(s)
- Xiao-Hui Wu
- Quanzhou Children's Hospital, Quanzhou, Fujian Province, China
| | - Shuang-Zhu Lin
- Diagnosis and Treatment Center for Children, Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Zhen-Xian Liu
- Diagnosis and Treatment Center for Children, Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Yang-Fan Qi
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Wan-Qi Wang
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Jia-Yi Li
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Qian-Dui Chen
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Lu-Lu Yang
- Emergency Department, The Changchun Hospital of Traditional Chinese Medicine, Changchun, Jilin Province, China
| |
Collapse
|
2
|
Abramenko IV, Bilous NI, Chumak AA, Diagil IS, Martina ZV. THE EXPRESSION OF THE MAIN AND ALTERNATIVE TRANSCRIPT (SORL1 Delta2) OF THE SORL1 GENE IN CHRONIC LYMPHOCYTIC LEUKEMIA PATIENTS AFFECTED BY THE CHORNOBYL ACCIDENT. PROBLEMY RADIATSIINOI MEDYTSYNY TA RADIOBIOLOHII 2021; 26:273-283. [PMID: 34965554 DOI: 10.33145/2304-8336-2021-26-273-283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Indexed: 06/14/2023]
Abstract
OBJECTIVE to study clinical-hematological data and expression of the main and alternative transcripts of SORL1 genein chronic lymphocytic leukemia (CLL) patients affected by the Chornobyl catastrophe. METHODS Analysis was performed in the main group of 34 CLL patients irradiated due to the Chornobyl NPP acci-dent (30 clean-up workers, and 4 evacuees) and in the control group of 27 non-irradiated CLL patients. Groups ofpatients were comparable by age, sex, stage of disease, mutational status of IGHV genes. Expression of the main andalternative transcripts of SORL1 gene was evaluated by Quantitative Real-time polymerase chain reaction (PCR). TheIGHV gene mutational status, TP53 and SF3B1 mutations were studied by PCR followed by direct sequencing. Data wereanalyzed with the SPSS software package, version 20.0. RESULTS Relative expression level of the main transcript of SORL1 gene was low (mean 1.71 ± 0.55, median 0.57),did not correlate with the IGHV gene mutational status, TP53 and SF3B1 mutations, stage of disease. The expressionof B transcript was not detected, F transcript was expressed at a very low level in 9 patients. The average relativeexpression level of SORL1-Δ2 transcript was 14.1 ± 6.04 (median 3.48; range 0.01-90.51). The expression of SORL1-Δ2transcript above the median was more frequent among patients on C stage (p = 0.001), and in patients with unmu-tated IGHV genes was associated with an extremely negative course of CLL (median of overall survival 9 months vs61 months at low expression). Relative expression levels of the main and alternative transcripts of SORL1 gene inpatients of the main and the control groups did not differ. CONCLUSIONS Our preliminary data suggest that increased expression of SORL1-Δ2 transcript in CLL patients withunmutated IGHV genes can be considered as a negative prognostic marker.
Collapse
MESH Headings
- Adult
- Aged
- Chernobyl Nuclear Accident
- Female
- Gene Expression Regulation, Leukemic
- Humans
- LDL-Receptor Related Proteins/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/physiopathology
- Leukemia, Radiation-Induced/genetics
- Leukemia, Radiation-Induced/physiopathology
- Male
- Membrane Transport Proteins/genetics
- Middle Aged
- Mutation
- Occupational Exposure/adverse effects
- Radiation Exposure/adverse effects
- Radioactive Hazard Release
- Transcription, Genetic
- Ukraine
Collapse
Affiliation(s)
- I V Abramenko
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - N I Bilous
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - A A Chumak
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - I S Diagil
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| | - Z V Martina
- State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Yuriia Illienka Str., Kyiv, 04050, Ukraine
| |
Collapse
|
3
|
Zhou Q, Xu M, Wang X, Yu M, Chen X, Lu J, Zhou R, Zhang J, Ling X, Ji J. Deficiency of TBL1XR1 causes asthenozoospermia. Andrologia 2021; 53:e13980. [PMID: 33528066 DOI: 10.1111/and.13980] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 12/20/2020] [Accepted: 01/04/2021] [Indexed: 12/29/2022] Open
Abstract
Transducin (β)-like 1 X-linked receptor 1 (TBL1XR1) is an evolutionarily conserved protein related to spermatozoa. To clarify its role and mechanism of action in spermatozoa, qRT-PCR was used to analyse the expression of TBL1XR1 in human spermatozoa and mouse testes. The mice were established as an animal model by injecting the mice testes with small interfering RNA against TBL1XR1 or control siRNA. Our results indicated that deficiency of TBL1XR1 in mice reduced the motility of spermatozoa and disrupted the histone-to-protamine transition. We also found the decreased expression of TBL1XR1 in the spermatozoa of human patients with asthenozoospermia (AZ) compared with that in the spermatozoa of healthy males. Moreover, we carried out chromatin immunoprecipitation analyses and found that genes downstream of TBL1XR1 were related to sperm motility. Thus, TBL1XR1 might be related to sperm motility and might function through its downstream genes. Our data highlight the role of TBL1XR1 involved in spermatozoa and provide new molecular insights into the intricate systems required for male fertility.
Collapse
Affiliation(s)
- Qiao Zhou
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Miaofei Xu
- Cellular and Molecular Pathology Branch, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Xin Wang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Department of Histology and Embryology, Nanjing Medical University, Nanjing, China
| | - Mingming Yu
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Xiaojiao Chen
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Jing Lu
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Ran Zhou
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Junqiang Zhang
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Xiufeng Ling
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Juan Ji
- The Affiliated Obstetrics and Gynecology Hospital with Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| |
Collapse
|
4
|
TBL1XR1-JAK2: a novel fusion in a pediatric T cell acute lymphoblastic leukemia patient with increased absolute eosinophil count. J Hematop 2020. [DOI: 10.1007/s12308-020-00413-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
5
|
Gu JF, Fu W, Qian HX, Gu WX, Zong Y, Chen Q, Lu L. TBL1XR1 induces cell proliferation and inhibit cell apoptosis by the PI3K/AKT pathway in pancreatic ductal adenocarcinoma. World J Gastroenterol 2020; 26:3586-3602. [PMID: 32742128 PMCID: PMC7366057 DOI: 10.3748/wjg.v26.i25.3586] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/09/2020] [Accepted: 05/26/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Pancreatic ductal adenocarcinoma (PDAC) is one of the deadliest solid tumors. Identification of diagnostic and therapeutic biomarkers for PDAC is urgently needed. Transducin (β)-like 1 X-linked receptor 1 (TBL1XR1) has been linked to the progression of various human cancers. Nevertheless, the function and role of TBL1XR1 in pancreatic cancers are unclear.
AIM To elucidate the function and potential mechanism of TBL1XR1 in the development of PDAC.
METHODS Ninety patients with histologically-confirmed PDAC were included in this study. PDAC tumor samples and cell lines were used to determine the expression of TBL1XR1. CCK-8 assays and colony formation assays were carried out to assess PDAC cell viability. Flow cytometry was performed to measure the changes in the cell cycle and cell apoptosis. Changes in related protein expression were measured by western blot analysis. Animal analysis was conducted to confirm the impact of TBL1XR1 in vivo.
RESULTS Patients with TBL1XR1-positive tumors had worse overall survival than those with TBL1XR1-negative tumors. Moreover, we found that TBL1XR1 strongly promoted PDAC cell proliferation and inhibited PDAC cell apoptosis. Moreover, knockdown of TBL1XR1 induced G0/G1 phase arrest. In vivo animal studies confirmed that TBL1XR1 accelerated tumor cell growth. The results of western blot analysis showed that TBL1XR1 might play a key role in regulating PDAC cell proliferation and apoptosis via the PI3K/AKT pathway.
CONCLUSION TBL1XR1 promoted PDAC cell progression and might be an effective diagnostic and therapeutic marker for pancreatic cancer.
Collapse
Affiliation(s)
- Jian-Feng Gu
- Department of General Surgery, Changshu No. 1 People’s Hospital Affiliated to Soochow University, Changshu 215500, Jiangsu Province, China
| | - Wei Fu
- Department of Oncology, Changshu No. 1 People’s Hospital Affiliated to Soochow University, Changshu 215500, Jiangsu Province, China
| | - Hai-Xin Qian
- Department of General Surgery, the First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China
| | - Wen-Xiu Gu
- Department of General Surgery, Changshu No. 1 People’s Hospital Affiliated to Soochow University, Changshu 215500, Jiangsu Province, China
| | - Yang Zong
- Department of General Surgery, Changshu No. 1 People’s Hospital Affiliated to Soochow University, Changshu 215500, Jiangsu Province, China
| | - Qian Chen
- Department of General Surgery, Changshu No. 1 People’s Hospital Affiliated to Soochow University, Changshu 215500, Jiangsu Province, China
| | - Long Lu
- Department of Oncology, Changshu No. 1 People’s Hospital Affiliated to Soochow University, Changshu 215500, Jiangsu Province, China
| |
Collapse
|
6
|
Wang L, Zhao H, Zhang L, Luo H, Chen Q, Zuo X. HSP90AA1, ADRB2, TBL1XR1 and HSPB1 are chronic obstructive pulmonary disease-related genes that facilitate squamous cell lung cancer progression. Oncol Lett 2020; 19:2115-2122. [PMID: 32194709 PMCID: PMC7039115 DOI: 10.3892/ol.2020.11318] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 06/12/2019] [Indexed: 12/28/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) and squamous cell lung carcinoma (SCC) are smoking-related diseases. However, the connection between the two is poorly understood. Microarray gene expression profiles in bronchial epithelium from patients with SCC with or without COPD were downloaded from the Gene Expression Omnibus repository. Differentially expressed genes associated with COPD and SCC were identified and visualized using the Advanced Network Merger module in Cytoscape. COPD-associated genes in SCC progression were further identified using the BisoGenet plug-in in Cytoscape. The genetic interaction network was predicted using the Network Analysis function. Heat shock protein 90 α family class A member 1 (HSP90AA1), adrenoceptor β2 (ADRB2), transducin β like 1 X-linked receptor 1 (TBL1XR1) and heat shock protein family B (small) member 1 (HSPB1) were identified to be differentially expressed in SCC and COPD cases. The overall survival rate associated with the gene signatures was investigated using clinical samples from patients with SCC and COPD from the PROGgene database. The results suggest that the pathogenesis of SCC caused by COPD is regulated by HSP90AA1, ADRB2, TBL1XR1 and HSPB1. These genes may serve as potential therapeutic targets for the treatment of patients with COPD-related SCC.
Collapse
Affiliation(s)
- Lijing Wang
- Department of Gerontology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Hongjun Zhao
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Lemeng Zhang
- Department of Thoracic Oncology, Hunan Cancer Hospital, Central South University, Changsha, Hunan 410008, P.R. China.,Department of Thoracic Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410008, P.R. China
| | - Hui Luo
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Qiong Chen
- Department of Gerontology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Xiaoxia Zuo
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| |
Collapse
|
7
|
Talbot H, Saada S, Naves T, Gallet PF, Fauchais AL, Jauberteau MO. Regulatory Roles of Sortilin and SorLA in Immune-Related Processes. Front Pharmacol 2019; 9:1507. [PMID: 30666202 PMCID: PMC6330335 DOI: 10.3389/fphar.2018.01507] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 12/10/2018] [Indexed: 12/25/2022] Open
Abstract
Sortilin, also known as Neurotensin Receptor-3, and the sorting-related receptor with type-A repeats (SorLA) are both members of the Vps10p domain receptor family. Initially identified in CNS cells, they are expressed in various other cell types where they exert multiple functions. Although mostly studied for its involvement in Alzheimer’s disease, SorLA has recently been shown to be implicated in immune response by regulating IL-6-mediated signaling, as well as driving monocyte migration. Sortilin has been shown to act as a receptor, as a co-receptor and as an intra- and extracellular trafficking regulator. In the last two decades, deregulation of sortilin has been demonstrated to be involved in many human pathophysiologies, including neurodegenerative disorders (Alzheimer and Parkinson diseases), type 2 diabetes and obesity, cancer, and cardiovascular pathologies such as atherosclerosis. Several studies highlighted different functions of sortilin in the immune system, notably in microglia, pro-inflammatory cytokine regulation, phagosome fusion and pathogen clearance. In this review, we will analyze the multiple roles of sortilin and SorLA in the human immune system and how their deregulation may be involved in disease development.
Collapse
Affiliation(s)
- Hugo Talbot
- Faculty of Medicine, University of Limoges, Limoges, France
| | - Sofiane Saada
- Faculty of Medicine, University of Limoges, Limoges, France
| | - Thomas Naves
- Faculty of Medicine, University of Limoges, Limoges, France
| | | | - Anne-Laure Fauchais
- Faculty of Medicine, University of Limoges, Limoges, France.,Department of Internal Medicine, University Hospital Limoges Dupuytren Hospital, Limoges, France
| | - Marie-Odile Jauberteau
- Faculty of Medicine, University of Limoges, Limoges, France.,Department of Immunology, University Hospital Limoges Dupuytren Hospital, Limoges, France
| |
Collapse
|
8
|
Zhao Y, Lin H, Jiang J, Ge M, Liang X. TBL1XR1 as a potential therapeutic target that promotes epithelial-mesenchymal transition in lung squamous cell carcinoma. Exp Ther Med 2018; 17:91-98. [PMID: 30651768 PMCID: PMC6307521 DOI: 10.3892/etm.2018.6955] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 08/22/2018] [Indexed: 12/22/2022] Open
Abstract
Transducin (β)-like 1 X-linked receptor 1 (TBL1XR1) has been demonstrated to serve a vital role in tumor progression. However, the biological role and molecular mechanisms of TBL1XR1 in lung squamous cell carcinoma (SCC) remain largely unknown. The purpose of the present study was to investigate the biological role of TBL1XR1 and its mechanism in lung SCC. TBL1XR1 was expressed in a human bronchial epithelial cell line and in lung SCC cell lines. The present study analyzed TBL1XR1-induced proliferation, invasion and migration abilities in vitro using the cell counting kit-8 assay, cell invasion assay and wound healing assay, respectively. This study examined the effects of TBL1XR1 on epithelial-mesenchymal transition (EMT) in lung SCC cells and activation of the transforming growth factor (TGF)-β/mothers against decapentaplegic homolog (Smad) signaling pathway by western blotting. The results indicated that TBL1XR1 was upregulated in lung SCC cells. Overexpression of TBL1XR1 increased the rate of cell proliferation compared with the control group. In vitro, overexpression of TBL1XR1 promoted cell invasion and migration ability compared with the control group. In addition, overexpression of TBL1XR1 produced a mesenchymal phenotype, while cells with downregulated TBL1XR1 produced an epithelial phenotype. Overexpression of TBL1XR1 significantly increased E-cadherin protein expression whilst snail family transcriptional repressor 1 (SNAI1), zinc finger E-box binding homebox 1 (ZEB1), p-Smad2/3, Smad2 and Smad3 protein expression was significantly reduced, compared with the control group. Downregulation of TBL1XR1 produced the opposite results. The present study indicated that TBL1XR1 contributed to lung SCC development and progression, and therefore TBL1XR1 may be a potential therapeutic target. TBL1XR1 may induce EMT of lung SCC cells through activation of the TGF-β/Smad signaling pathway.
Collapse
Affiliation(s)
- Yuehua Zhao
- Department of Oncology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China.,Department of Oncology, Shanghai Medical College of Fudan University, Shanghai 200040, P.R. China
| | - Hao Lin
- Department of Oncology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China.,Department of Oncology, Shanghai Medical College of Fudan University, Shanghai 200040, P.R. China
| | - Jingwei Jiang
- Department of Oncology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China.,Department of Oncology, Shanghai Medical College of Fudan University, Shanghai 200040, P.R. China
| | - Mengxi Ge
- Department of Oncology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China.,Department of Oncology, Shanghai Medical College of Fudan University, Shanghai 200040, P.R. China
| | - Xiaohua Liang
- Department of Oncology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China.,Department of Oncology, Shanghai Medical College of Fudan University, Shanghai 200040, P.R. China
| |
Collapse
|
9
|
Lemattre C, Thevenon J, Duffourd Y, Nambot S, Haquet E, Vuadelle B, Genevieve D, Sarda P, Bruel AL, Kuentz P, Wells CF, Faivre L, Willems M. TBL1XR1 mutations in Pierpont syndrome are not restricted to the recurrent p.Tyr446Cys mutation. Am J Med Genet A 2018; 176:2813-2818. [PMID: 30365874 DOI: 10.1002/ajmg.a.40510] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 07/02/2018] [Accepted: 07/23/2018] [Indexed: 02/02/2023]
Abstract
Pierpont syndrome is a rare and sporadic syndrome, including developmental delay, facial characteristics, and abnormal extremities. Recently, a recurrent de novo TBL1XR1 variant (c.1337A > G; p.Tyr446Cys) has been identified in eight patients by whole-exome sequencing. A dominant-negative effect of this mutation is strongly suspected, since patients with TBL1XR1 deletion and other variants predicting loss of function do not share the same phenotype. We report two patients with typical Pierpont-like syndrome features. Exome sequencing allowed identifying a de novo heterozygous missense TBL1XR1 variant in both patients, different from those already reported: p.Cys325Tyr and p.Tyr446His. The localization of these mutations and clinical features of Pierpont-like syndrome suggest that their functional consequences are comparable with the recurrent mutation previously described, and provided additional data to understand molecular mechanisms of TBL1XR1 anomalies.
Collapse
Affiliation(s)
- C Lemattre
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, Montpellier, France
| | - J Thevenon
- Equipe GAD, UMR1231, Université de Bourgogne Franche Comté, Dijon, France.,Département de Génétique et Procréation, Hôpital Couple-Enfant, CHU, Grenoble, France
| | - Y Duffourd
- Equipe GAD, UMR1231, Université de Bourgogne Franche Comté, Dijon, France.,Orphanomix, SATT Grand Est, Dijon, France.,UF Innovation en Diagnostic Génomique des Maladies Rares, Centre Hospitalier Universitaire de Dijon, Dijon, France.,Centre de Référence Anomalies du Développement et Syndromes Malformatifs et FHU TRANSLAD, Hôpital d'enfants, CHU, Dijon, France
| | - S Nambot
- Equipe GAD, UMR1231, Université de Bourgogne Franche Comté, Dijon, France
| | - E Haquet
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, Montpellier, France
| | | | - D Genevieve
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, Montpellier, France
| | - P Sarda
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, Montpellier, France
| | - A L Bruel
- Equipe GAD, UMR1231, Université de Bourgogne Franche Comté, Dijon, France
| | - P Kuentz
- Equipe GAD, UMR1231, Université de Bourgogne Franche Comté, Dijon, France.,Laboratoire de Biologie Moléculaire, CHRU Saint-Jacques, Besançon, France
| | - C F Wells
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, Montpellier, France
| | - L Faivre
- Equipe GAD, UMR1231, Université de Bourgogne Franche Comté, Dijon, France.,Centre de Référence Anomalies du Développement et Syndromes Malformatifs et FHU TRANSLAD, Hôpital d'enfants, CHU, Dijon, France
| | - M Willems
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, Montpellier, France
| |
Collapse
|
10
|
Liu F, Gao H, Zhao Y, Zhu Z. Transducin (β)-like 1 X-linked receptor 1 correlates with clinical prognosis and clinicopathological characteristics in human solid carcinomas. Oncotarget 2017; 8:61626-61636. [PMID: 28977891 PMCID: PMC5617451 DOI: 10.18632/oncotarget.18650] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 05/15/2017] [Indexed: 12/13/2022] Open
Abstract
Transducin (β)-like 1 X-linked receptor 1(TBL1XR1) has been reported to be overexpressed in various human cancers, as well as contributing to carcinogenesis and progression. This synthetic analysis was performed to assess whether TBL1XR1 protein could act as a potential prognostic molecular marker for human cancers. Several online databases (PubMed, Web of Science, Embase together with Wanfang and China National Knowledge Internet database) were retrieved to identify TBL1XR1-related publications. A total of ten studies with 1837 cancer patients were included in this meta-analysis. Hazard ratios (HR) with 95% confidence intervals (CI) were applied to assess the association between TBL1XR1 expression and cancer prognosis. Odds ratios (OR) were calculated to determine the relationship between TBL1XR1 expression and clinicopathological characteristics. The overall results revealed that the overexpression of TBL1XR1 was correlated with poorer overall survival (OS) (HR: 1.77, 95% CI: 1.49–2.06, p < 0.001) and worse disease-free survival (DFS) (HR: 1.51, 95% CI: 1.19–1.84, p < 0.001) in human solid cancers. Statistical significance for OS was also found in subgroup analysis stratified by the cancer type, analysis method and follow-up time. Furthermore, elevated TBL1XR1 was associated with unfavorable clinicopathological characteristics including tumor size, depth of invasion, lymph node metastasis and TNM stage. Our meta-analysis suggested that TBL1XR1 might be served as a novel and promising biomarker to predict prognosis and clinicopathologic characteristic for cancer patients.
Collapse
Affiliation(s)
- Fangteng Liu
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, P. R. China
| | - Hui Gao
- The Children's Hospital of Zhejiang University School of Medicine, Hangzhou 310052, Zhejiang Province, P. R. China
| | - Yang Zhao
- Nanchang University School of Public Health, Nanchang 330031, Jiangxi Province, P. R. China
| | - Zhengming Zhu
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, P. R. China
| |
Collapse
|
11
|
Sugita Y, Ohwada C, Kawaguchi T, Muto T, Tsukamoto S, Takeda Y, Mimura N, Takeuchi M, Sakaida E, Shimizu N, Tanaka H, Abe D, Fukazawa M, Sugawara T, Aotsuka N, Nishiwaki K, Shono K, Ebinuma H, Fujimura K, Bujo H, Yokote K, Nakaseko C. Prognostic impact of serum soluble LR11 in newly diagnosed diffuse large B-cell lymphoma: A multicenter prospective analysis. Clin Chim Acta 2016; 463:47-52. [DOI: 10.1016/j.cca.2016.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 10/05/2016] [Accepted: 10/06/2016] [Indexed: 12/13/2022]
|
12
|
Zhou Q, Wang X, Yu Z, Wu X, Chen X, Li J, Zhu Z, Liu B, Su L. Transducin (β)-like 1 X-linked receptor 1 promotes gastric cancer progression via the ERK1/2 pathway. Oncogene 2016; 36:1873-1886. [PMID: 27694893 PMCID: PMC5378934 DOI: 10.1038/onc.2016.352] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 08/17/2016] [Accepted: 08/19/2016] [Indexed: 02/06/2023]
Abstract
Gastric cancer (GC) is one of the most common types of cancer worldwide, and it involves extensive local tumour invasion, metastasis and poor prognosis. Understanding the mechanisms regulating the progression of GC is necessary for the development of effective therapeutic strategies. Transducin (β)-like 1 X-linked receptor 1 (TBL1XR1) is an important regulator controlling gene activation and repression, which has been thought to be involved in tumorigenesis. However, the role of TBL1XR1 in human GC remains largely unknown. Here, we find that TBL1XR1 is aberrantly expressed in human GC tissues, and TBL1XR1 levels are highly correlated with local tumour invasion, late tumor, lymph node, metastasis (TNM) stage and poor prognosis. Knockdown of TBL1XR1 by shRNA inhibits GC cell proliferation, migration, invasion, epithelial-mesenchymal transition (EMT) in vitro, as well as tumorigenesis and peritoneal metastasis in vivo, whereas overexpression of TBL1XR1 produces the opposite effects. These effects are mediated by activation of the ERK1/2 signalling pathway, and inhibition of this pathway with a specific ERK1/2 inhibitor (U0126) significantly impairs the tumour-promoting effects induced by TBL1XR1. Moreover, TBL1XR1 mediated ERK1/2 activation is dependent on the β-catenin/MMP7/EGFR signalling pathway. In conclusion, TBL1XR1 contributes to GC tumorigenesis and progression through the activation of the β-catenin/MMP7/EGFR/ERK signalling pathway and may act as a new therapeutic target for GC.
Collapse
Affiliation(s)
- Q Zhou
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - X Wang
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Z Yu
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - X Wu
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - X Chen
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - J Li
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Z Zhu
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - B Liu
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - L Su
- Department of Surgery, Shanghai Key Laboratory of Gastric Neoplasms, Shanghai Institute of Digestive Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| |
Collapse
|
13
|
Jiang L, Konishi H, Nurwidya F, Satoh K, Takahashi F, Ebinuma H, Fujimura K, Takasu K, Jiang M, Shimokawa H, Bujo H, Daida H. Deletion of LR11 Attenuates Hypoxia-Induced Pulmonary Arterial Smooth Muscle Cell Proliferation With Medial Thickening in Mice. Arterioscler Thromb Vasc Biol 2016; 36:1972-9. [PMID: 27493099 DOI: 10.1161/atvbaha.116.307900] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 07/19/2016] [Indexed: 11/16/2022]
Abstract
OBJECTIVE We aimed to determine whether LR11 (low-density lipoprotein receptor with 11 binding repeats) is a potential key regulator of smooth muscle cell (SMC) proliferation during the progression of hypoxia-induced medial thickening in mice and whether sLR11 (soluble LR11) can serve as a biomarker in patients with pulmonary arterial hypertension. APPROACH AND RESULTS The role of LR11 in pulmonary arterial hypertension was investigated using mouse and cell models of induced hypoxia. The expression of LR11 and of hypoxia-inducible factor-1α was significantly increased in lung tissues from C57Bl/6 mice after 3 weeks of exposure to hypoxia compared with normoxia. Serum sLR11 levels were also increased. Physiological and histochemical analyses showed that increased right ventricular systolic pressure, right ventricular hypertrophy, and medial thickening induced under hypoxia in wild-type mice were attenuated in LR11(-/-) mice. The proliferation rates stimulated by hypoxia or platelet-derived growth factor-BB were attenuated in SMC derived from LR11(-/-) mice, compared with those from wild-type mice. Exogenous sLR11 protein increased the proliferation rates of SMC from wild-type mice. The expression of LR11 and hypoxia-inducible factor-1α was increased in cultured SMC under hypoxic conditions, and hypoxia-inducible factor-1α knockdown almost abolished the induction of LR11. Serum sLR11 levels were significantly higher in patients with, rather than without, pulmonary arterial hypertension. sLR11 levels positively correlated with pulmonary vascular resistance and mean pulmonary arterial pressure. CONCLUSIONS LR11 regulated SMC proliferation during the progression of hypoxia-induced medial thickening in mice. The findings obtained from mice, together with those in humans, indicate that sLR11 could serve as a novel biomarker that reflects the pathophysiology of proliferating medial SMC in pulmonary arterial hypertension.
Collapse
Affiliation(s)
- Le Jiang
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Hakuoh Konishi
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.).
| | - Fariz Nurwidya
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Kimio Satoh
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Fumiyuki Takahashi
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Hiroyuki Ebinuma
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Kengo Fujimura
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Kiyoshi Takasu
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Meizi Jiang
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Hiroaki Shimokawa
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Hideaki Bujo
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| | - Hiroyuki Daida
- From the Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (L.J., H.K., K.T., H.D.); Department of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan (F.N., F.T.); Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.S., H.S.); Tsukuba Research Institute, Sekisui Medical Co Ltd, Ryugasaki, Japan (H.E., K.F.); and Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University Sakura Medical Center, Sakura, Japan (M.J., H.B.)
| |
Collapse
|
14
|
A new syndrome of intellectual disability with dysmorphism due toTBL1XR1deletion. Am J Med Genet A 2014; 167A:164-8. [DOI: 10.1002/ajmg.a.36759] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 07/08/2014] [Indexed: 11/07/2022]
|
15
|
TBLR1 fuses to retinoid acid receptor α in a variant t(3;17)(q26;q21) translocation of acute promyelocytic leukemia. Blood 2014; 124:936-45. [PMID: 24782508 DOI: 10.1182/blood-2013-10-528596] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The majority of acute promyelocytic leukemia (APL) cases are characterized by the PML-RARα fusion gene. Although the PML-RARα fusion gene can be detected in >98% of APL cases, RARα is also found to be fused with other partner genes, which are also related to all-trans retinoic acid (ATRA)-dependent transcriptional activity and cell differentiation. In this study, we identified a novel RARα fusion gene, TBLR1-RARα (GenBank KF589333), in a rare case of APL with a t(3;17)(q26;q21),t(7;17)(q11.2;q21) complex chromosomal rearrangement. To our knowledge, TBLR1-RARα is the 10th RARα chimeric gene that has been reported up to now. TBLR1-RARα contained the B-F domains of RARα and exhibited a distinct subcellular localization. It could form homodimers and also heterodimers with retinoid X receptor α. As a result, TBLR1-RARα exhibited diminished transcriptional activity by recruitment of more transcriptional corepressors compared with RARα. In the presence of pharmacologic doses of ATRA, TBLR1-RARα could be degraded, and its homodimerization was abrogated. Moreover, when treated with ATRA, TBLR1-RARα could mediate the dissociation and degradation of transcriptional corepressors, consequent transactivation of RARα target genes, and cell differentiation induction in a dose- and time-dependent manner.
Collapse
|
16
|
Shimizu N, Nakaseko C, Jiang M, Nishii K, Yokote K, Iseki T, Higashi M, Tamaru J, Schneider WJ, Bujo H. G-CSF induces the release of the soluble form of LR11, a regulator of myeloid cell mobilization in bone marrow. Ann Hematol 2014; 93:1111-22. [DOI: 10.1007/s00277-014-2033-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 02/06/2014] [Indexed: 12/21/2022]
|
17
|
Kawaguchi T, Ohwada C, Takeuchi M, Shimizu N, Sakaida E, Takeda Y, Sakai S, Tsukamoto S, Yamazaki A, Sugita Y, Jiang M, Higashi M, Yokote K, Tamaru JI, Bujo H, Nakaseko C. LR11: a novel biomarker identified in follicular lymphoma. Br J Haematol 2013; 163:277-80. [PMID: 23848957 DOI: 10.1111/bjh.12467] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
18
|
Nishii K, Nakaseko C, Jiang M, Shimizu N, Takeuchi M, Schneider WJ, Bujo H. The soluble form of LR11 protein is a regulator of hypoxia-induced, urokinase-type plasminogen activator receptor (uPAR)-mediated adhesion of immature hematological cells. J Biol Chem 2013; 288:11877-86. [PMID: 23486467 DOI: 10.1074/jbc.m112.442491] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A key property of hematopoietic stem and progenitor cells (HSPCs) regarding differentiation from the self-renewing quiescent to the proliferating stage is their adhesion to the bone marrow (BM) niche. An important molecule involved in proliferation and pool size of HSPCs in the BM is the hypoxia-induced urokinase-type plasminogen activator receptor (uPAR). Here, we show that the soluble form (sLR11) of LR11 (also called SorLA or SORL1) modulates the uPAR-mediated attachment of HSPCs under hypoxic conditions. Immunohistochemical and mRNA expression analyses revealed that hypoxia increased LR11 expression in hematological c-Kit(+) Lin(-) cells. In U937 cells, hypoxia induced a transient rise in LR11 transcription, production of cellular protein, and release of sLR11. Attachment to stromal cells of c-Kit(+) Lin(-) cells of lr11(-/-) mice was reduced by hypoxia much more than of lr11(+/+) animals. sLR11 induced the adhesion of U937 and c-Kit(+) Lin(-) cells to stromal cells. Cell attachment was increased by sLR11 and reduced in the presence of anti-uPAR antibodies. Furthermore, the fraction of uPAR co-immunoprecipitated with LR11 in membrane extracts of U937 cells was increased by hypoxia. CoCl2, a chemical inducer of HIF-1α, enhanced the levels of LR11 and sLR11 in U937 cells. The decrease in hypoxia-induced attachment of HIF-1α-knockdown cells was largely prevented by exogenously added sLR11. Finally, hypoxia induced HIF-1α binding to a consensus binding site in the LR11 promoter. Thus, we conclude that sLR11 regulates the hypoxia-enhanced adhesion of HSPCs via an uPAR-mediated pathway that stabilizes the hematological pool size by controlling cell attachment to the BM niche.
Collapse
Affiliation(s)
- Keigo Nishii
- Department of Genome Research and Clinical Application, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan
| | | | | | | | | | | | | |
Collapse
|
19
|
Sakai S, Nakaseko C, Takeuchi M, Ohwada C, Shimizu N, Tsukamoto S, Kawaguchi T, Jiang M, Sato Y, Ebinuma H, Yokote K, Iwama A, Fukamachi I, Schneider WJ, Saito Y, Bujo H. Circulating soluble LR11/SorLA levels are highly increased and ameliorated by chemotherapy in acute leukemias. Clin Chim Acta 2012; 413:1542-8. [DOI: 10.1016/j.cca.2012.06.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 06/21/2012] [Accepted: 06/21/2012] [Indexed: 01/30/2023]
|
20
|
Liu CL, Yu IS, Pan HW, Lin SW, Hsu HC. L2dtl Is Essential for Cell Survival and Nuclear Division in Early Mouse Embryonic Development. J Biol Chem 2007; 282:1109-18. [PMID: 17107960 DOI: 10.1074/jbc.m606535200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
l(2)dtl (lethal (2) denticleless), is an embryonic lethal homozygous mutation initially identified in Drosophila melanogaster that produces embryos that lack ventral denticle belts. In addition to nucleotide sequence, bioinformatic analysis has revealed a conservation of critical functional motifs among the human L2DTL, mouse L2dtl, and Drosophila l(2)dtl proteins. The function of the L2DTL protein in the development of mammalian embryos was studied using targeted disruption of the L2dtl gene in mice. The knock-out resulted in early embryonic lethality. L2dtl-/- embryos were deformed and terminated development at the 4-8-cell stage. Microinjection of a small interfering RNA (siRNA) vector (siRNA-L2dtl) into the two-cell stage nuclei of wild-type mouse embryos led to cell cycle progression failure, termination of cell division, and, eventually, embryonic death during the preimplantation stage. Morphological studies of the embryos 54 h after injection showed fragmentation of mitotic chromosomes and chromosomal lagging, hallmarks of mitotic catastrophe. The siRNA-L2dtl-treated embryos eventually lysed and failed to develop into blastocysts after 72 h of in vitro culturing. However, the embryos developed normally after they were microinjected into one nucleus of the two-celled embryos. The siRNA studies in HeLa cells showed that L2dtl protein depletion results in multinucleation and down-regulation of phosphatidylinositol 3-kinase, proliferating cell nuclear antigen, and PTTG1/securin, which might partially explain the mitotic catastrophe observed in L2dtl-depleted mouse embryos. Based on these findings, we conclude that L2dtl gene expression is essential for very early mouse embryonic development.
Collapse
Affiliation(s)
- Chao-Lien Liu
- Graduate Institute of Pathology and Department of Clinical Laboratory Sciences and Medical Biotechnology, College of Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | | | | | | | | |
Collapse
|
21
|
Tsinkalovsky O, Filipski E, Rosenlund B, Sothern RB, Eiken HG, Wu MW, Claustrat B, Bayer J, Lévi F, Laerum OD. Circadian expression of clock genes in purified hematopoietic stem cells is developmentally regulated in mouse bone marrow. Exp Hematol 2006; 34:1249-61. [PMID: 16939818 DOI: 10.1016/j.exphem.2006.05.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2006] [Revised: 04/11/2006] [Accepted: 05/01/2006] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Clock genes are known to mediate circadian rhythms in the central nervous system and peripheral organs. Although they are expressed in mouse hematopoietic progenitor and stem cells, it is unknown if they are related to circadian rhythms in these cells. We therefore investigated the 24-hour patterns in the activity of several clock genes in the bone marrow (BM) side population (SP) primitive stem cells, and compared these 24-hour patterns to clock gene variations in the whole BM and liver. METHODS Cells were obtained from 84 B6D2F(1) mice in three replicate experiments on the second day after release into constant darkness from a standardizing light-dark schedule. mRNA expression of clock genes was measured with quantitative reverse transcriptase polymerase chain reaction. RESULTS mPer2 displayed circadian rhythms in SP cells, whole BM, and liver cells. mPer1 and mRev-erb alpha showed a circadian rhythm in whole BM and liver, but not SP cells. mBmal1 was not expressed rhythmically in SP cells, nor in the whole BM, contrary to rhythms observed in the liver. CONCLUSIONS With the exception of mPer2, most clock genes studied in primitive hematopoietic SP stem cells were not oscillating in a fully organized circadian manner, which is similar to immature cells in rapidly proliferating organs, such as the testis and thymus. These findings indicate that circadian clock gene expression variations in BM are developmentally regulated.
Collapse
Affiliation(s)
- Oleg Tsinkalovsky
- Stem Cell Research Group, The Gade Institute, Department of Pathology, Haukeland University Hospital, Bergen, Norway
| | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Zhang XM, Chang Q, Zeng L, Gu J, Brown S, Basch RS. TBLR1 regulates the expression of nuclear hormone receptor co-repressors. BMC Cell Biol 2006; 7:31. [PMID: 16893456 PMCID: PMC1555579 DOI: 10.1186/1471-2121-7-31] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2005] [Accepted: 08/07/2006] [Indexed: 12/02/2022] Open
Abstract
Background Transcription is regulated by a complex interaction of activators and repressors. The effectors of repression are large multimeric complexes which contain both the repressor proteins that bind to transcription factors and a number of co-repressors that actually mediate transcriptional silencing either by inhibiting the basal transcription machinery or by recruiting chromatin-modifying enzymes. Results TBLR1 [GenBank: NM024665] is a co-repressor of nuclear hormone transcription factors. A single highly conserved gene encodes a small family of protein molecules. Different isoforms are produced by differential exon utilization. Although the ORF of the predominant form contains only 1545 bp, the human gene occupies ~200 kb of genomic DNA on chromosome 3q and contains 16 exons. The genomic sequence overlaps with the putative DC42 [GenBank: NM030921] locus. The murine homologue is structurally similar and is also located on Chromosome 3. TBLR1 is closely related (79% homology at the mRNA level) to TBL1X and TBL1Y, which are located on Chromosomes X and Y. The expression of TBLR1 overlaps but is distinct from that of TBL1. An alternatively spliced form of TBLR1 has been demonstrated in human material and it too has an unique pattern of expression. TBLR1 and the homologous genes interact with proteins that regulate the nuclear hormone receptor family of transcription factors. In resting cells TBLR1 is primarily cytoplasmic but after perturbation the protein translocates to the nucleus. TBLR1 co-precipitates with SMRT, a co-repressor of nuclear hormone receptors, and co-precipitates in complexes immunoprecipitated by antiserum to HDAC3. Cells engineered to over express either TBLR1 or N- and C-terminal deletion variants, have elevated levels of endogenous N-CoR. Co-transfection of TBLR1 and SMRT results in increased expression of SMRT. This co-repressor undergoes ubiquitin-mediated degradation and we suggest that the stabilization of the co-repressors by TBLR1 occurs because of a novel mechanism that protects them from degradation. Transient over expression of TBLR1 produces growth arrest. Conclusion TBLR1 is a multifunctional co-repressor of transcription. The structure of this family of molecules is highly conserved and closely related co-repressors have been found in all eukaryotic organisms. Regulation of co-repressor expression and the consequent alterations in transcriptional silencing play an important role in the regulation of differentiation.
Collapse
Affiliation(s)
- Xin-Min Zhang
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
| | - Qing Chang
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
| | - Lin Zeng
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
| | - Judy Gu
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
| | - Stuart Brown
- Department of Cell Biology, New York University School of Medicine, New York, NY 10016, USA
| | - Ross S Basch
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
- NYU Cancer Institute, New York University Medical Center, New York, NY 10016, USA
| |
Collapse
|
23
|
Larderet G, Fortunel NO, Vaigot P, Cegalerba M, Maltère P, Zobiri O, Gidrol X, Waksman G, Martin MT. Human side population keratinocytes exhibit long-term proliferative potential and a specific gene expression profile and can form a pluristratified epidermis. Stem Cells 2005; 24:965-74. [PMID: 16282445 DOI: 10.1634/stemcells.2005-0196] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of the present study was to characterize human side population (SP) epidermal keratinocytes isolated from primary cell cultures. For that purpose, keratinocytes were isolated from normal adult breast skin samples and the Hoechst 33342 exclusion assay described for hematopoietic cells was adapted to keratinocytes. Three types of keratinocytes were studied: the SP, the main population (MP), and the unsorted initial population. SP keratinocytes represented 0.16% of the total population. In short-term cultures, they exhibited an increased colony-forming efficiency and produced more actively growing colonies than did unsorted and MP keratinocytes. In long-term cultures, SP cells exhibited an extensive expansion potential, performing a mean of 44 population doublings for up to 12 successive passages after cell sorting. Moreover, even in long-term cultures, SP keratinocytes were able to form a pluristratified epidermis when seeded on a dermal substrate. Unsorted and MP keratinocytes promoted a reduced expansion: mean values of 14 population doublings for five passages and 12 population doublings for four successive passages, respectively. To further characterize SP cells, cDNA microarrays were used to identify their molecular signature. Transcriptome profiling showed that 41 genes were differentially expressed in SP (vs. MP) cells, with 37 upregulated genes and only four downregulated genes in SP cells. The majority of these genes were functionally related to the regulation of transcription and cell signaling. In conclusion, SP human keratinocytes isolated from primary cultures exhibited both short- and long-term high proliferative potential, formed a pluristratified epidermis, and were characterized by a specific gene expression profile.
Collapse
|
24
|
Gratenstein K, Heggestad AD, Fortun J, Notterpek L, Pestov DG, Fletcher BS. The WD-repeat protein GRWD1: potential roles in myeloid differentiation and ribosome biogenesis. Genomics 2005; 85:762-73. [PMID: 15885502 DOI: 10.1016/j.ygeno.2005.02.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Revised: 02/15/2005] [Accepted: 02/17/2005] [Indexed: 11/27/2022]
Abstract
A cDNA fragment originally identified in U-937 cells as a vitamin D(3)-regulated gene is here designated the glutamate-rich WD-repeat (GRWD1) gene. WD-repeat proteins are a class of functionally divergent molecules that cooperate with other proteins to regulate cellular processes. GRWD1 encodes a 446-amino-acid protein containing a glutamate-rich region followed by four WD repeats. The yeast homologue of GRWD1, Rrb1, has been shown to be an essential protein involved in ribosome biogenesis. Northern analysis of GRWD1 message levels in the myeloid cell line HL-60 undergoing differentiation induced by vitamin D(3) or retinoic acid demonstrate downregulation coincident with slowing of cellular proliferation. A siRNA designed to downregulate GRWD1 similarly results in a decrease in cellular proliferation within 293 cells. Metabolic labeling of cells expressing the siRNA to GRWD1 shows a decrease in global protein synthesis. Finally, nuclear fractionation studies show cosedimentation of GRWD1 with preribosomal complexes, as well as the WD-repeat-containing protein Bop1, which has previously been implicated in ribosome biogenesis. These studies suggest that within mammalian cells GRWD1 plays a role in ribosome biogenesis and during myeloid differentiation its levels are regulated.
Collapse
Affiliation(s)
- Kim Gratenstein
- Department of Pharmacology and Therapeutics, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | | | | | | | | | | |
Collapse
|
25
|
Kawakami M, Kimura T, Kishimoto Y, Tatekawa T, Baba Y, Nishizaki T, Matsuzaki N, Taniguchi Y, Yoshihara S, Ikegame K, Shirakata T, Nishida S, Masuda T, Hosen N, Tsuboi A, Oji Y, Oka Y, Ogawa H, Sonoda Y, Sugiyama H, Kawase I, Soma T. Preferential expression of the vasoactive intestinal peptide (VIP) receptor VPAC1 in human cord blood-derived CD34+CD38- cells: possible role of VIP as a growth-promoting factor for hematopoietic stem/progenitor cells. Leukemia 2004; 18:912-21. [PMID: 14999295 DOI: 10.1038/sj.leu.2403330] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Primitive hematopoietic progenitor cells such as severe combined immunodeficiency- repopulating cells and long-term culture-initiating cells are enriched in CD34+CD38- cells derived from various stem cell sources. In this study, to elucidate the features of such primitive cells at the molecular level, we tried to isolate genes that were preferentially expressed in umbilical cord blood (CB)-derived CD34+CD38- cells by subtractive hybridization. The gene for VPAC1 receptor, a receptor for the neuropeptide vasoactive intestinal peptide (VIP), was thereby isolated and it was shown that this gene was expressed in both CD34+CD38- and CD34+CD38+ CB cells and that the expression levels were higher in CD34+CD38- CB cells. Next, we assessed the effects of VIP on the proliferation of CD34+ CB cells using in vitro culture systems. In serum-free single-cell suspension culture, VIP enhanced clonal growth of CD34+ CB cells in synergy with FLT3 ligand (FL), stem cell factor (SCF), and thrombopoietin (TPO). In serum-free clonogenic assays, VIP promoted myeloid (colony-forming unit-granulocyte/macrophage (CFU-GM)) and mixed (CFU-Mix) colony formations. Furthermore, in Dexter-type long-term cultures, VIP increased colony-forming cells at week 5 of culture. These results suggest that VIP functions as a growth-promoting factor of CB-derived hematopoetic progenitor cells.
Collapse
Affiliation(s)
- M Kawakami
- Department of Cancer Immunotherapy, Osaka University Graduate School of Medicine, Osaka, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Staal FJT, Weerkamp F, Baert MRM, van den Burg CMM, van Noort M, de Haas EFE, van Dongen JJM. Wnt Target Genes Identified by DNA Microarrays in Immature CD34+Thymocytes Regulate Proliferation and Cell Adhesion. THE JOURNAL OF IMMUNOLOGY 2004; 172:1099-108. [PMID: 14707084 DOI: 10.4049/jimmunol.172.2.1099] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The thymus is seeded by very small numbers of progenitor cells that undergo massive proliferation before differentiation and rearrangement of TCR genes occurs. Various signals mediate proliferation and differentiation of these cells, including Wnt signals. Wnt signals induce the interaction of the cytoplasmic cofactor beta-catenin with nuclear T cell factor (TCF) transcription factors. We identified target genes of the Wnt/beta-catenin/TCF pathway in the most immature (CD4-CD8-CD34+) thymocytes using Affymetrix DNA microarrays in combination with three different functional assays for in vitro induction of Wnt signaling. A relatively small number (approximately 30) of genes changed expression, including several proliferation-inducing transcription factors such as c-fos and c-jun, protein phosphatases, and adhesion molecules, but no genes involved in differentiation to mature T cell stages. The adhesion molecules likely confine the proliferating immature thymocytes to the appropriate anatomical sites in the thymus. For several of these target genes, we validated that they are true Wnt/beta-catenin/TCF target genes using real-time quantitative PCR and reporter gene assays. The same core set of genes was repressed in Tcf-1-null mice, explaining the block in early thymocyte development in these mice. In conclusion, Wnt signals mediate proliferation and cell adhesion, but not differentiation of the immature thymic progenitor pool.
Collapse
Affiliation(s)
- Frank J T Staal
- Department of Immunology, Erasmus MC, University Medical Center Rotterdam, Dr. Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
| | | | | | | | | | | | | |
Collapse
|
27
|
Ng YY, van Kessel B, Lokhorst HM, Baert MRM, van den Burg CMM, Bloem AC, Staal FJT. Gene-expression profiling of CD34+cells from various hematopoietic stem-cell sources reveals functional differences in stem-cell activity. J Leukoc Biol 2003; 75:314-23. [PMID: 14634063 DOI: 10.1189/jlb.0603287] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The replacement of bone marrow (BM) as a conventional source of stem cell (SC) by umbilical cord blood (UCB) and granulocyte-colony stimulating factor-mobilized peripheral blood SC (PBSC) has brought about clinical advantages. However, several studies have demonstrated that UCB CD34(+) cells and PBSC significantly differ from BM CD34(+) cells qualitatively and quantitatively. Here, we quantified the number of SC in purified BM, UCB CD34(+) cells, and CD34(+) PBSC using in vitro and in vivo assays for human hematopoietic SC (HSC) activity. A cobblestone area-forming cell (CAFC) assay showed that UCB CD34(+) cells contained the highest frequency of CAFC(wk6) (3.6- to tenfold higher than BM CD34(+) cells and PBSC, respectively), and the engraftment capacity in vivo by nonobese diabetic/severe combined immunodeficiency repopulation assay was also significantly greater than BM CD34(+), with a higher proportion of CD45(+) cells detected in the recipients at a lower cell dose. To understand the molecular characteristics underlying these functional differences, we performed several DNA microarray experiments using Affymetrix gene chips, containing 12,600 genes. Comparative analysis of gene-expression profiles showed differential expression of 51 genes between BM and UCB CD34(+) SC and 64 genes between BM CD34(+) cells and PBSC. These genes are involved in proliferation, differentiation, apoptosis, and engraftment capacity of SC. Thus, the molecular expression profiles reported here confirmed functional differences observed among the SC sources. Moreover, this report provides new insights to describe the molecular phenotype of CD34(+) HSC and leads to a better understanding of the discrepancy among the SC sources.
Collapse
Affiliation(s)
- Yuk Yin Ng
- Erasmus University Medical Center Rotterdam, Dr. Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
| | | | | | | | | | | | | |
Collapse
|
28
|
Gregorio-King CC, McLeod JL, Collier FM, Collier GR, Bolton KA, Van Der Meer GJ, Apostolopoulos J, Kirkland MA. MERP1: a mammalian ependymin-related protein gene differentially expressed in hematopoietic cells. Gene 2002; 286:249-57. [PMID: 11943480 DOI: 10.1016/s0378-1119(02)00434-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We have utilized differential display polymerase chain reaction to investigate the gene expression of hematopoietic progenitor cells from adult bone marrow and umbilical cord blood. A differentially expressed gene was identified in CD34+ hematopoietic progenitor cells, with low expression in CD34- cells. We have obtained the full coding sequence of this gene which we designated human mammalian ependymin-related protein 1 (MERP1). Expression of MERP1 was found in a variety of normal human tissues, and is 4- and 10-fold higher in adult bone marrow and umbilical cord blood CD34+ cells, respectively, compared to CD34- cells. Additionally, MERP1 expression in a hematopoietic stem cell enriched population was down-regulated with proliferation and differentiation. Conceptual translation of the MERP1 open reading frame reveals significant homology to two families of glycoprotein calcium-dependant cell adhesion molecules: ependymins and protocadherins.
Collapse
Affiliation(s)
- Claudia C Gregorio-King
- Stem Cell Laboratory, The Douglas Hocking Research Institute, Barwon Health, The Geelong Hospital, Geelong, VIC, 3220, Australia.
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Zhang J, Kalkum M, Chait BT, Roeder RG. The N-CoR-HDAC3 nuclear receptor corepressor complex inhibits the JNK pathway through the integral subunit GPS2. Mol Cell 2002; 9:611-23. [PMID: 11931768 DOI: 10.1016/s1097-2765(02)00468-9] [Citation(s) in RCA: 337] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The corepressors N-CoR and SMRT partner with histone deacetylases (HDACs) in diverse repression pathways. We report here that GPS2, a protein involved in intracellular signaling, is an integral subunit of the N-CoR-HDAC3 complex. We have determined structural motifs that direct the formation of a highly stable and active deacetylase complex. GPS2 and TBL1, another component of the N-CoR-HDAC3 complex, interact cooperatively with repression domain 1 of N-CoR to form a heterotrimeric structure and are indirectly linked to HDAC3 via an extended N-CoR SANT domain that also activates latent HDAC3 activity. More importantly, we show here that the N-CoR-HDAC3 complex inhibits JNK activation through the associated GPS2 subunit and thus could potentially provide an alternative mechanism for hormone-mediated antagonism of AP-1 function.
Collapse
Affiliation(s)
- Jinsong Zhang
- Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA
| | | | | | | |
Collapse
|
30
|
Apostolopoulos J, Sparrow RL, McLeod JL, Collier FM, Darcy PK, Slater HR, Ngu C, Gregorio-King CC, Kirkland MA. Identification and characterization of a novel family of mammalian ependymin-related proteins (MERPs) in hematopoietic, nonhematopoietic, and malignant tissues. DNA Cell Biol 2001; 20:625-35. [PMID: 11749721 DOI: 10.1089/104454901753340613] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Evidence is presented for a family of mammalian homologs of ependymin, which we have termed the mammalian ependymin-related proteins (MERPs). Ependymins are secreted glycoproteins that form the major component of the cerebrospinal fluid in many teleost fish. We have cloned the entire coding region of human MERP-1 and mapped the gene to chromosome 7p14.1 by fluorescence in situ hybridization. In addition, three human MERP pseudogenes were identified on chromosomes 8, 16, and X. We have also cloned the mouse MERP-1 homolog and an additional family member, mouse MERP-2. Then, using bioinformatics, the mouse MERP-2 gene was localized to chromosome 13, and we identified the monkey MERP-1 homolog and frog ependymin-related protein (ERP). Despite relatively low amino acid sequence conservation between piscine ependymins, toad ERP, and MERPs, several amino acids (including four key cysteine residues) are strictly conserved, and the hydropathy profiles are remarkably alike, suggesting the possibilities of similar protein conformation and function. As with fish ependymins, frog ERP and MERPs contain a signal peptide typical of secreted proteins. The MERPs were found to be expressed at high levels in several hematopoietic cell lines and in nonhematopoietic tissues such as brain, heart, and skeletal muscle, as well as several malignant tissues and malignant cell lines. These findings suggest that MERPs have several potential roles in a range of cells and tissues.
Collapse
Affiliation(s)
- J Apostolopoulos
- Research Unit, Australian Red Cross Blood Service-Victoria, Southbank, Victoria, Australia.
| | | | | | | | | | | | | | | | | |
Collapse
|