1
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Shao Y, Zhou L, Li F, Zhao L, Zhang BL, Shao F, Chen JW, Chen CY, Bi X, Zhuang XL, Zhu HL, Hu J, Sun Z, Li X, Wang D, Rivas-González I, Wang S, Wang YM, Chen W, Li G, Lu HM, Liu Y, Kuderna LFK, Farh KKH, Fan PF, Yu L, Li M, Liu ZJ, Tiley GP, Yoder AD, Roos C, Hayakawa T, Marques-Bonet T, Rogers J, Stenson PD, Cooper DN, Schierup MH, Yao YG, Zhang YP, Wang W, Qi XG, Zhang G, Wu DD. Phylogenomic analyses provide insights into primate evolution. Science 2023; 380:913-924. [PMID: 37262173 DOI: 10.1126/science.abn6919] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 01/26/2023] [Indexed: 06/03/2023]
Abstract
Comparative analysis of primate genomes within a phylogenetic context is essential for understanding the evolution of human genetic architecture and primate diversity. We present such a study of 50 primate species spanning 38 genera and 14 families, including 27 genomes first reported here, with many from previously less well represented groups, the New World monkeys and the Strepsirrhini. Our analyses reveal heterogeneous rates of genomic rearrangement and gene evolution across primate lineages. Thousands of genes under positive selection in different lineages play roles in the nervous, skeletal, and digestive systems and may have contributed to primate innovations and adaptations. Our study reveals that many key genomic innovations occurred in the Simiiformes ancestral node and may have had an impact on the adaptive radiation of the Simiiformes and human evolution.
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Affiliation(s)
- Yong Shao
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
| | - Long Zhou
- Center of Evolutionary & Organismal Biology, and Women's Hospital at Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Fang Li
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, DK-2100 Copenhagen, Denmark
- Institute of Animal Sex and Development, ZhejiangWanli University, Ningbo 315100, China
| | - Lan Zhao
- Shaanxi Key Laboratory for Animal Conservation, College of Life Sciences, Northwest University, Xi'an 710069, China
| | - Bao-Lin Zhang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
| | - Feng Shao
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Sciences, Chongqing 400715, China
| | | | - Chun-Yan Chen
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710072, China
| | - Xupeng Bi
- Center of Evolutionary & Organismal Biology, and Women's Hospital at Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Xiao-Lin Zhuang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
- Kunming College of Life Science, University of the Chinese Academy of Sciences, Kunming 650204, China
| | | | - Jiang Hu
- Grandomics Biosciences, Beijing 102206, China
| | - Zongyi Sun
- Grandomics Biosciences, Beijing 102206, China
| | - Xin Li
- Grandomics Biosciences, Beijing 102206, China
| | - Depeng Wang
- Grandomics Biosciences, Beijing 102206, China
| | | | - Sheng Wang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
| | - Yun-Mei Wang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
| | - Wu Chen
- Guangzhou Zoo & Guangzhou Wildlife Research Center, Guangzhou 510070, China
| | - Gang Li
- College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China
| | - Hui-Meng Lu
- School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yang Liu
- College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China
| | - Lukas F K Kuderna
- Institute of Evolutionary Biology (UPF-CSIC), PRBB, 08003 Barcelona, Spain
- Illumina Artificial Intelligence Laboratory, Illumina Inc, San Diego, CA 92122, USA
| | - Kyle Kai-How Farh
- Illumina Artificial Intelligence Laboratory, Illumina Inc, San Diego, CA 92122, USA
| | - Peng-Fei Fan
- School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
| | - Li Yu
- State Key Laboratory for Conservation and Utilization of Bio-Resource in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
| | - Ming Li
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Zhi-Jin Liu
- College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - George P Tiley
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Anne D Yoder
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Christian Roos
- Gene Bank of Primates and Primate Genetics Laboratory, German Primate Center, Leibniz Institute for Primate Research, 37077 Göttingen, Germany
| | - Takashi Hayakawa
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
- Japan Monkey Centre, Inuyama, Aichi 484-0081, Japan
| | - Tomas Marques-Bonet
- Institute of Evolutionary Biology (UPF-CSIC), PRBB, 08003 Barcelona, Spain
- Catalan Institution of Research and Advanced Studies (ICREA), Passeig de Lluís Companys, 23, 08010 Barcelona, Spain
- CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain
- Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, c/ Columnes s/n, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Jeffrey Rogers
- Human Genome Sequencing Center, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Peter D Stenson
- Institute of Medical Genetics, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - David N Cooper
- Institute of Medical Genetics, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | | | - Yong-Gang Yao
- Kunming College of Life Science, University of the Chinese Academy of Sciences, Kunming 650204, China
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650201, China
- National Resource Center for Non-Human Primates, Kunming Primate Research Center, and National Research Facility for Phenotypic & Genetic Analysis of Model Animals (Primate Facility), Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650107, China
| | - Ya-Ping Zhang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650201, China
- National Resource Center for Non-Human Primates, Kunming Primate Research Center, and National Research Facility for Phenotypic & Genetic Analysis of Model Animals (Primate Facility), Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650107, China
| | - Wen Wang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710072, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650201, China
| | - Xiao-Guang Qi
- Shaanxi Key Laboratory for Animal Conservation, College of Life Sciences, Northwest University, Xi'an 710069, China
| | - Guojie Zhang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
- Center of Evolutionary & Organismal Biology, and Women's Hospital at Zhejiang University School of Medicine, Hangzhou 310058, China
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, DK-2100 Copenhagen, Denmark
- Liangzhu Laboratory, Zhejiang University Medical Center, Hangzhou 311121, China
| | - Dong-Dong Wu
- State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650201, China
- National Resource Center for Non-Human Primates, Kunming Primate Research Center, and National Research Facility for Phenotypic & Genetic Analysis of Model Animals (Primate Facility), Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650107, China
- KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650204, China
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2
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Martins-da-Silva A, Baroni M, Salomão KB, das Chagas PF, Bonfim-Silva R, Geron L, Cruzeiro GAV, da Silva WA, Corrêa CAP, Carlotti CG, de Paula Queiroz RG, Marie SKN, Brandalise SR, Yunes JA, Scrideli CA, Valera ET, Tone LG. Clinical Prognostic Implications of Wnt Hub Genes Expression in Medulloblastoma. Cell Mol Neurobiol 2023; 43:813-826. [PMID: 35366170 DOI: 10.1007/s10571-022-01217-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 03/22/2022] [Indexed: 11/03/2022]
Abstract
Medulloblastoma is the most common type of pediatric malignant primary brain tumor, and about one-third of patients die due to disease recurrence and most survivors suffer from long-term side effects. MB is clinically, genetically, and epigenetically heterogeneous and subdivided into at least four molecular subgroups: WNT, SHH, Group 3, and Group 4. We evaluated common differentially expressed genes between a Brazilian RNA-seq GSE181293 dataset and microarray GSE85217 dataset cohort of pediatric MB samples using bioinformatics methodology in order to identify hub genes of the molecular subgroups based on PPI network construction, survival and functional analysis. The main finding was the identification of five hub genes from the WNT subgroup that are tumor suppressors, and whose lower expression is related to a worse prognosis for MB patients. Furthermore, the common genes correlated with the five tumor suppressors participate in important pathways and processes for tumor initiation and progression, as well as development and differentiation, and some of them control cell stemness and pluripotency. These genes have not yet been studied within the context of MB, representing new important elements for investigation in the search for therapeutic targets, prognostic markers or for understanding of MB biology.
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Affiliation(s)
- Andrea Martins-da-Silva
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil.
| | - Mirella Baroni
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Karina Bezerra Salomão
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Pablo Ferreira das Chagas
- Department of Genetics, Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Ricardo Bonfim-Silva
- Department of Surgery and Anatomy, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Lenisa Geron
- Department of Genetics, Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Gustavo Alencastro Veiga Cruzeiro
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil.,Department of Pediatric Oncology, Harvard Medical School - Dana-Farber Cancer Institute, Boston, MA, USA
| | - Wilson Araújo da Silva
- Department of Genetics, Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Carolina Alves Pereira Corrêa
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Carlos Gilberto Carlotti
- Department of Surgery and Anatomy, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Rosane Gomes de Paula Queiroz
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | | | | | | | - Carlos Alberto Scrideli
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil.,Department of Genetics, Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Elvis Terci Valera
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
| | - Luiz Gonzaga Tone
- Department of Pediatrics, University Hospital - Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil.,Department of Genetics, Ribeirão Preto Medical School - University of São Paulo, Ribeirão Preto, Brazil
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3
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Bai J, Shi J, Zhang Y, Li C, Xiong Y, Koka H, Wang D, Zhang T, Song L, Luo W, Zhu B, Hicks B, Hutchinson A, Kirk E, Troester MA, Li M, Shen Y, Ma T, Wang J, Liu X, Wang S, Gui S, McMaster ML, Chanock SJ, Parry DM, Goldstein AM, Yang XR. Gene Expression Profiling Identifies Two Chordoma Subtypes Associated with Distinct Molecular Mechanisms and Clinical Outcomes. Clin Cancer Res 2023; 29:261-270. [PMID: 36260525 DOI: 10.1158/1078-0432.ccr-22-1865] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 07/30/2022] [Accepted: 10/17/2022] [Indexed: 02/07/2023]
Abstract
PURPOSE Chordoma is a rare bone tumor with a high recurrence rate and limited treatment options. The aim of this study was to identify molecular subtypes of chordoma that may improve clinical management. EXPERIMENTAL DESIGN We conducted RNA sequencing in 48 tumors from patients with Chinese skull-base chordoma and identified two major molecular subtypes. We then replicated the classification using a NanoString panel in 48 patients with chordoma from North America. RESULTS Tumors in one subtype were more likely to have somatic mutations and reduced expression in chromatin remodeling genes, such as PBRM1 and SETD2, whereas the other subtype was characterized by the upregulation of genes in epithelial-mesenchymal transition and Sonic Hedgehog pathways. IHC staining of top differentially expressed genes between the two subtypes in 312 patients with Chinese chordoma with long-term follow-up data showed that the expression of some markers such as PTCH1 was significantly associated with survival outcomes. CONCLUSIONS Our findings may improve the understanding of subtype-specific tumorigenesis of chordoma and inform clinical prognostication and targeted options.
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Affiliation(s)
- Jiwei Bai
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.,Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Jianxin Shi
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Yazhuo Zhang
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.,Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China.,Beijing Institute for Brain Disorders Brain Tumor Center, Beijing, China
| | - Chuzhong Li
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.,Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China.,Beijing Institute for Brain Disorders Brain Tumor Center, Beijing, China
| | - Yujia Xiong
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Hela Koka
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Difei Wang
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Tongwu Zhang
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Lei Song
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Wen Luo
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Bin Zhu
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Belynda Hicks
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Amy Hutchinson
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Erin Kirk
- Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, North Carolina
| | - Melissa A Troester
- Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, North Carolina
| | - Mingxuan Li
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Yutao Shen
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Tianshun Ma
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Junmei Wang
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China.,Beijing Institute for Brain Disorders Brain Tumor Center, Beijing, China
| | - Xing Liu
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China.,Beijing Institute for Brain Disorders Brain Tumor Center, Beijing, China
| | - Shuai Wang
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Songbai Gui
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Mary L McMaster
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Stephen J Chanock
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Dilys M Parry
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Alisa M Goldstein
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
| | - Xiaohong R Yang
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, DHHS, Bethesda, Maryland
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4
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Zhang J, Chen Y, Yan L, Zhang X, Zheng X, Qi J, Yang F, Li J. EphA3 deficiency in hypothalamus promotes high fat diet-induced obesity in mice. J Biomed Res 2022; 37:179-193. [PMID: 37013864 DOI: 10.7555/jbr.36.20220168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Erythropoietin-producing hepatocellular carcinoma A3 (EphA3) is a member of the largest subfamily of tyrosine kinase receptors-Eph receptors. Previous studies have shown that EphA3 is associated with tissue development. Recently, we have found that the expression of EphA3 is elevated in the hypothalamus of mice with diet-induced obesity (DIO). However, the role of EphA3 in hypothalamic-controlled energy metabolism remains unclear. In the current study, we demonstrated that the deletion of EphA3 in the hypothalamus by CRISPR/Cas9-mediated gene editing promotes obesity in male mice with high-fat diet feeding rather than those with normal chow diet feeding. Moreover, the deletion of hypothalamic EphA3 promotes high-fat DIO by increasing food intake and reducing energy expenditure. Knockdown of EphA3 leads to smaller intracellular vesicles in GT1-7 cells. The current study reveals that hypothalamic EphA3 plays important roles in promoting DIO.
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Affiliation(s)
- Jubiao Zhang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Yang Chen
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Lihong Yan
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xin Zhang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xiaoyan Zheng
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Junxia Qi
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Fen Yang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
| | - Juxue Li
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing Medical University, Nanjing, Jiangsu 211166, China
- The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China
- The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210011, China
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5
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Yoshinaga S, Shin M, Kitazawa A, Ishii K, Tanuma M, Kasai A, Hashimoto H, Kubo KI, Nakajima K. Comprehensive characterization of migration profiles of murine cerebral cortical neurons during development using FlashTag labeling. iScience 2021; 24:102277. [PMID: 33851097 PMCID: PMC8022222 DOI: 10.1016/j.isci.2021.102277] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 12/30/2020] [Accepted: 03/01/2021] [Indexed: 11/26/2022] Open
Abstract
In the mammalian cerebral neocortex, different regions have different cytoarchitecture, neuronal birthdates, and functions. In most regions, neuronal migratory profiles are speculated similar based on observations using thymidine analogs. Few reports have investigated regional migratory differences from mitosis at the ventricular surface. In this study, we applied FlashTag technology, in which dyes are injected intraventricularly, to describe migratory profiles. We revealed a mediolateral regional difference in the migratory profiles of neurons that is dependent on developmental stage; for example, neurons labeled at embryonic day 12.5–15.5 reached their destination earlier dorsomedially than dorsolaterally, even where there were underlying ventricular surfaces, reflecting sojourning below the subplate. This difference was hardly recapitulated by thymidine analogs, which visualize neurogenic gradients, suggesting a biological significance different from the neurogenic gradient. These observations advance our understanding of cortical development and the power of FlashTag in studying migration and are thus resources for future neurodevelopmental studies. FlashTag visualized mediolateral regional differences of cortical migratory profiles Mediolateral differences were observed when neurons were labeled at E12.5–15.5 Late-born neurons transiently sojourned below the dorsolateral subplate (SP) cells The difference was unclear in reeler cortex, where SP cells position superficially
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Affiliation(s)
- Satoshi Yoshinaga
- Department of Anatomy, Keio University School of Medicine, Shinjuku, Tokyo 160-8582, Japan
| | - Minkyung Shin
- Department of Anatomy, Keio University School of Medicine, Shinjuku, Tokyo 160-8582, Japan
| | - Ayako Kitazawa
- Department of Anatomy, Keio University School of Medicine, Shinjuku, Tokyo 160-8582, Japan
| | - Kazuhiro Ishii
- Department of Anatomy, Keio University School of Medicine, Shinjuku, Tokyo 160-8582, Japan
| | - Masato Tanuma
- Laboratory of Molecular Neuropharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Atsushi Kasai
- Laboratory of Molecular Neuropharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hitoshi Hashimoto
- Laboratory of Molecular Neuropharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan.,Molecular Research Center for Children's Mental Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University, and University of Fukui, Suita, Osaka 565-0871, Japan.,Division of Bioscience, Institute for Datability Science, Osaka University, Suita, Osaka 565-0871, Japan.,Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka 565-0871, Japan.,Department of Molecular Pharmaceutical Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Ken-Ichiro Kubo
- Department of Anatomy, Keio University School of Medicine, Shinjuku, Tokyo 160-8582, Japan.,Department of Anatomy, The Jikei University School of Medicine, Minato, Tokyo 105-8461, Japan
| | - Kazunori Nakajima
- Department of Anatomy, Keio University School of Medicine, Shinjuku, Tokyo 160-8582, Japan
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6
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London M, Gallo E. Critical role of EphA3 in cancer and current state of EphA3 drug therapeutics. Mol Biol Rep 2020; 47:5523-5533. [PMID: 32621117 DOI: 10.1007/s11033-020-05571-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 06/05/2020] [Indexed: 12/14/2022]
Abstract
The erythropoietin-producing human hepatocellular (Eph) receptors are transmembrane glycoprotein members of the tyrosine kinase receptors family. The Ephs may bind to various ephrin ligands resulting in the phosphorylation of their tyrosine kinase domain and the activation of the Eph receptor. In this review we focus on EphA3, one receptor of the 14 different Ephs, as it carries out both redundant and restricted functions in the germline development of mammals and in the maintenance of various adult tissues. The loss of EphA3 regulation is correlated with various human malignancies, the most notable being cancer. This receptor is overexpressed and/or mutated in multiple tumors, and is also associated with poor prognosis and decreased survival in patients. Here we highlight the role of EphA3 in normal and malignant tissues that are specific to cancer; these include hematologic disorders, gastric cancer, glioblastoma multiforme, colorectal cancer, lung cancer, renal cell carcinoma, and prostate cancer. Moreover, various anticancer agents against EphA3 have been developed to either inhibit its kinase domain activity or to function as agonists. Thus, we examine the most potent small molecule drugs and mAb-based therapeutics against EphA3 that are currently in pre-clinical or clinical stages.
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Affiliation(s)
- Max London
- Department of Molecular Genetics, Donnelly Centre, University of Toronto, 160 College Street, Toronto, ON, M5S 3E1, Canada
| | - Eugenio Gallo
- Department of Molecular Genetics, Donnelly Centre, University of Toronto, 160 College Street, Toronto, ON, M5S 3E1, Canada.
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7
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Javier-Torrent M, Marco S, Rocandio D, Pons-Vizcarra M, Janes PW, Lackmann M, Egea J, Saura CA. Presenilin/γ-secretase-dependent EphA3 processing mediates axon elongation through non-muscle myosin IIA. eLife 2019; 8:43646. [PMID: 31577226 PMCID: PMC6774734 DOI: 10.7554/elife.43646] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 09/18/2019] [Indexed: 01/08/2023] Open
Abstract
EphA/ephrin signaling regulates axon growth and guidance of neurons, but whether this process occurs also independently of ephrins is unclear. We show that presenilin-1 (PS1)/γ-secretase is required for axon growth in the developing mouse brain. PS1/γ-secretase mediates axon growth by inhibiting RhoA signaling and cleaving EphA3 independently of ligand to generate an intracellular domain (ICD) fragment that reverses axon defects in PS1/γ-secretase- and EphA3-deficient hippocampal neurons. Proteomic analysis revealed that EphA3 ICD binds to non-muscle myosin IIA (NMIIA) and increases its phosphorylation (Ser1943), which promotes NMIIA filament disassembly and cytoskeleton rearrangement. PS1/γ-secretase-deficient neurons show decreased phosphorylated NMIIA and NMIIA/actin colocalization. Moreover, pharmacological NMII inhibition reverses axon retraction in PS-deficient neurons suggesting that NMIIA mediates PS/EphA3-dependent axon elongation. In conclusion, PS/γ-secretase-dependent EphA3 cleavage mediates axon growth by regulating filament assembly through RhoA signaling and NMIIA, suggesting opposite roles of EphA3 on inhibiting (ligand-dependent) and promoting (receptor processing) axon growth in developing neurons.
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Affiliation(s)
- Míriam Javier-Torrent
- Institut de Neurociències, Department de Bioquímica i Biologia Molecular, Facultat de Medicina, Centro de Investigación Biomédica en Red Enfermedades Neurodegenerativas (CIBERNED), Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Sergi Marco
- Institut de Neurociències, Department de Bioquímica i Biologia Molecular, Facultat de Medicina, Centro de Investigación Biomédica en Red Enfermedades Neurodegenerativas (CIBERNED), Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Daniel Rocandio
- Institut de Recerca Biomédica de Lleida, Universitat de Lleida, Lleida, Spain
| | - Maria Pons-Vizcarra
- Institut de Neurociències, Department de Bioquímica i Biologia Molecular, Facultat de Medicina, Centro de Investigación Biomédica en Red Enfermedades Neurodegenerativas (CIBERNED), Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Peter W Janes
- Department of Biochemistry and Molecular Biology, Monash University, Victoria, Australia
| | - Martin Lackmann
- Department of Biochemistry and Molecular Biology, Monash University, Victoria, Australia
| | - Joaquim Egea
- Institut de Recerca Biomédica de Lleida, Universitat de Lleida, Lleida, Spain
| | - Carlos A Saura
- Institut de Neurociències, Department de Bioquímica i Biologia Molecular, Facultat de Medicina, Centro de Investigación Biomédica en Red Enfermedades Neurodegenerativas (CIBERNED), Universitat Autònoma de Barcelona, Barcelona, Spain
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8
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Martin-Lopez E, Meller SJ, Greer CA. Development of piriform cortex interhemispheric connections via the anterior commissure: progressive and regressive strategies. Brain Struct Funct 2018; 223:4067-4085. [PMID: 30141078 DOI: 10.1007/s00429-018-1741-y] [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: 05/30/2018] [Accepted: 08/21/2018] [Indexed: 12/27/2022]
Abstract
The anterior commissure (AC) is a phylogenetically conserved inter-hemispheric connection found among vertebrates with bilateral symmetry. The AC connects predominantly olfactory areas but many aspects of its development and structure are unknown. To fill this gap, we investigated the embryonic and postnatal development of the AC by tracing axons with DiI and the piggyback transposon multicolor system. With this strategy, we show that axon growth during establishment of the AC follows a strictly regulated timeline of events that include waiting periods ("regressive strategies") as well as periods of active axon outgrowth ("progressive strategies"). We also provide evidence that these processes may be regulated in the midline via overexpression of chondroitin sulfate proteoglycans. Additionally, we demonstrate that the ipsi- and contralateral innervation of piriform cortex occurs simultaneously. Morphologically, we found that 20% of axons were myelinated by postnatal day (P) 22, in a process that occurred fundamentally around P14. By immunohistochemistry, we described the presence of glial cells and two new subtypes of neurons: one expressing a calretinin (CR)-/MAP2+ phenotype, distributed homogeneously inside the AC; and the other expressing a CR+/MAP2+ phenotype that lies beneath the bed nucleus of the stria terminalis. Our results are consistent with the notion that the AC follows a strictly regulated program during the embryonic and postnatal development similarly to other distal targeting axonal tracts.
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Affiliation(s)
- Eduardo Martin-Lopez
- Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA.,Department of Neurosurgery, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA
| | - Sarah J Meller
- Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA.,Department of Neurosurgery, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA
| | - Charles A Greer
- Department of Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA. .,Department of Neurosurgery, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA. .,The Interdepartmental Neuroscience Graduate Program, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520, USA.
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9
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Lahtela J, Pradhan B, Närhi K, Hemmes A, Särkioja M, Kovanen PE, Brown A, Verschuren EW. The putative tumor suppressor gene EphA3 fails to demonstrate a crucial role in murine lung tumorigenesis or morphogenesis. Dis Model Mech 2015; 8:393-401. [PMID: 25713296 PMCID: PMC4381338 DOI: 10.1242/dmm.019257] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 02/12/2015] [Indexed: 01/04/2023] Open
Abstract
Treatment of non-small cell lung cancer (NSCLC) is based on histological analysis and molecular profiling of targetable driver oncogenes. Therapeutic responses are further defined by the landscape of passenger mutations, or loss of tumor suppressor genes. We report here a thorough study to address the physiological role of the putative lung cancer tumor suppressor EPH receptor A3 (EPHA3), a gene that is frequently mutated in human lung adenocarcinomas. Our data shows that homozygous or heterozygous loss of EphA3 does not alter the progression of murine adenocarcinomas that result from Kras mutation or loss of Trp53, and we detected negligible postnatal expression of EphA3 in adult wild-type lungs. Yet, EphA3 was expressed in the distal mesenchyme of developing mouse lungs, neighboring the epithelial expression of its Efna1 ligand; this is consistent with the known roles of EPH receptors in embryonic development. However, the partial loss of EphA3 leads only to subtle changes in epithelial Nkx2-1, endothelial Cd31 and mesenchymal Fgf10 RNA expression levels, and no macroscopic phenotypic effects on lung epithelial branching, mesenchymal cell proliferation, or abundance and localization of CD31-positive endothelia. The lack of a discernible lung phenotype in EphA3-null mice might indicate lack of an overt role for EPHA3 in the murine lung, or imply functional redundancy between EPHA receptors. Our study shows how biological complexity can challenge in vivo functional validation of mutations identified in sequencing efforts, and provides an incentive for the design of knock-in or conditional models to assign the role of EPHA3 mutation during lung tumorigenesis.
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Affiliation(s)
- Jenni Lahtela
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki FI-00014, Finland
| | - Barun Pradhan
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki FI-00014, Finland
| | - Katja Närhi
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki FI-00014, Finland
| | - Annabrita Hemmes
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki FI-00014, Finland
| | - Merja Särkioja
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki FI-00014, Finland
| | - Panu E Kovanen
- Department of Pathology, HUSLAB and Haartman Institute, Helsinki University Central Hospital and University of Helsinki FI-00014, Finland
| | - Arthur Brown
- Spinal Cord Injury Team, Robarts Research Institute, University of Western Ontario, London, ON N6A 5K8, Canada
| | - Emmy W Verschuren
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki FI-00014, Finland.
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10
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Ono K, Clavairoly A, Nomura T, Gotoh H, Uno A, Armant O, Takebayashi H, Zhang Q, Shimamura K, Itohara S, Parras CM, Ikenaka K. Development of the prethalamus is crucial for thalamocortical projection formation and is regulated by Olig2. Development 2014; 141:2075-84. [PMID: 24803655 DOI: 10.1242/dev.097790] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Thalamocortical axons (TCAs) pass through the prethalamus in the first step of their neural circuit formation. Although it has been supposed that the prethalamus is an intermediate target for thalamocortical projection formation, much less is known about the molecular mechanisms of this targeting. Here, we demonstrated the functional implications of the prethalamus in the formation of this neural circuit. We show that Olig2 transcription factor, which is expressed in the ventricular zone (VZ) of prosomere 3, regulates prethalamus formation, and loss of Olig2 results in reduced prethalamus size in early development, which is accompanied by expansion of the thalamic eminence (TE). Extension of TCAs is disorganized in the Olig2-KO dorsal thalamus, and initial elongation of TCAs is retarded in the Olig2-KO forebrain. Microarray analysis demonstrated upregulation of several axon guidance molecules, including Epha3 and Epha5, in the Olig2-KO basal forebrain. In situ hybridization showed that the prethalamus in the wild type excluded the expression of Epha3 and Epha5, whereas loss of Olig2 resulted in reduction of this Ephas-negative area and the corresponding expansion of the Ephas-positive TE. Dissociated cultures of thalamic progenitor cells demonstrated that substrate-bound EphA3 suppresses neurite extension from dorsal thalamic neurons. These results indicate that Olig2 is involved in correct formation of the prethalamus, which leads to exclusion of the EphA3-expressing region and is crucial for proper TCA formation. Our observation is the first report showing the molecular mechanisms underlying how the prethalamus acts on initial thalamocortical projection formation.
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Affiliation(s)
- Katsuhiko Ono
- Department of Biology, Kyoto Prefectural University of Medicine, Kyoto 603-8334, Japan
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11
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Keane N, Freeman C, Swords R, Giles FJ. EPHA3 as a novel therapeutic target in the hematological malignancies. Expert Rev Hematol 2014; 5:325-40. [DOI: 10.1586/ehm.12.19] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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12
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Axon guidance mechanisms for establishment of callosal connections. Neural Plast 2013; 2013:149060. [PMID: 23533817 PMCID: PMC3595665 DOI: 10.1155/2013/149060] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 12/30/2012] [Accepted: 01/21/2013] [Indexed: 01/03/2023] Open
Abstract
Numerous studies have investigated the formation of interhemispheric connections which are involved in high-ordered functions of the cerebral cortex in eutherian animals, including humans. The development of callosal axons, which transfer and integrate information between the right/left hemispheres and represent the most prominent commissural system, must be strictly regulated. From the beginning of their growth, until reaching their targets in the contralateral cortex, the callosal axons are guided mainly by two environmental cues: (1) the midline structures and (2) neighboring? axons. Recent studies have shown the importance of axona guidance by such cues and the underlying molecular mechanisms. In this paper, we review these guidance mechanisms during the development of the callosal neurons. Midline populations express and secrete guidance molecules, and "pioneer" axons as well as interactions between the medial and lateral axons are also involved in the axon pathfinding of the callosal neurons. Finally, we describe callosal dysgenesis in humans and mice, that results from a disruption of these navigational mechanisms.
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13
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Passmore MR, Nataatmadja M, Fraser JF. Assessment of control tissue for gene and protein expression studies: a comparison of three alternative lung sources. ScientificWorldJournal 2012; 2012:523840. [PMID: 22593690 PMCID: PMC3346271 DOI: 10.1100/2012/523840] [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: 10/14/2011] [Accepted: 11/24/2011] [Indexed: 11/23/2022] Open
Abstract
The use of an appropriate control group in human research is essential in investigating the level of a pathological disorder. This study aimed to compare three alternative sources of control lung tissue and to determine their suitability for gene and protein expression studies. Gene and protein expression levels of the vascular endothelial growth factor (VEGF) and gelatinase families and their receptors were measured using real-time reverse transcription polymerase chain reaction (RT-PCR) and immunohistochemistry. The gene expression levels of VEGFA, placental growth factor (PGF), and their receptors, fms-related tyrosine kinase 1 (FLT1), and kinase insert domain receptor (KDR) as well as matrix metalloproteinase-2 (MMP-2) and the inhibitors, tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) and TIMP-2 were significantly higher in lung cancer resections. The gene expression level of MMP-9 was significantly lower in the corresponding samples. Altered protein expression was also detected, depending on the area assessed. The results of this study show that none of the three control groups studied are completely suitable for gene and protein studies associated with the VEGF and gelatinase families, highlighting the need for researchers to be selective in which controls they opt for.
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Affiliation(s)
- Margaret R Passmore
- Critical Care Research Group, University of Queensland, Prince Charles Hospital, Brisbane, Australia.
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14
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Antypa M, Faux C, Eichele G, Parnavelas JG, Andrews WD. Differential gene expression in migratory streams of cortical interneurons. Eur J Neurosci 2012; 34:1584-94. [PMID: 22103416 PMCID: PMC3401901 DOI: 10.1111/j.1460-9568.2011.07896.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Cortical interneurons originate in the ganglionic eminences of the subpallium and migrate into the cortex in well-defined tangential streams. At the start of corticogenesis, two streams of migrating neurons are evident: a superficial one at the level of the preplate (PPL), and a deeper one at the level of the intermediate zone (IZ). Currently, little is known about the signalling mechanisms that regulate interneuron migration, and almost nothing is known about the molecules that may be involved in their choice of migratory stream. Here, we performed a microarray analysis, comparing the changes in gene expression between cells migrating in the PPL and those migrating in the IZ at embryonic day 13.5. This analysis identified genes, many of them novel, that were upregulated in one of the two streams. Moreover, polymerase chain reaction, in situ hybridization experiments and immunohistochemistry showed the expression of these genes in interneurons migrating within the PPL or IZ, suggesting that they play a role in their migration and choice of stream.
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Affiliation(s)
- Mary Antypa
- Department of Cell and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK
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15
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Abstract
The corpus callosum, composed of callosal axons, is the largest structure among commissural connections in eutherian animals. Axon pathfinding of callosal neurons has been shown to be guided by intermediate targets, such as midline glial structures. However, it has not yet been understood completely how axon-axon interactions, another major mechanism for axon pathfinding, are involved in the pathfinding of callosal neurons. Here, we show that callosal axons from the medial and lateral regions of the mouse cerebral cortex pass through the dorsal and ventral parts, respectively, of the corpus callosum. Using an explant culture system, we observed that the axons from the medial and lateral cortices were segregated from each other in vitro, and that this segregation was attenuated by inhibition of EphA3 signaling. We also found that knockdown of EphA3, which is preferentially expressed in the lateral cortex, resulted in disorganized segregation of the callosal axons and disrupted axon pathfinding in vivo. These results together suggest the role of axonal segregation in the corpus callosum, mediated at least in part by EphA3, in correct pathfinding of callosal neurons.
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16
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Oeschger FM, Wang WZ, Lee S, García-Moreno F, Goffinet AM, Arbonés ML, Rakic S, Molnár Z. Gene expression analysis of the embryonic subplate. ACTA ACUST UNITED AC 2011; 22:1343-59. [PMID: 21862448 PMCID: PMC4972418 DOI: 10.1093/cercor/bhr197] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The subplate layer of the cerebral cortex is comprised of a heterogeneous population of cells and contains some of the earliest-generated neurons. In the embryonic brain, subplate cells contribute to the guidance and areal targeting of thalamocortical axons. At later developmental stages, they are predominantly involved in the maturation and plasticity of the cortical circuitry and the establishment of functional modules. We aimed to further characterize the embryonic murine subplate population by establishing a gene expression profile at embryonic day (E) 15.5 using laser capture microdissection and microarrays. The microarray identified over 300 transcripts with higher expression in the subplate compared with the cortical plate at this stage. Using quantitative reverse transcription-polymerase chain reaction, in situ hybridization (ISH), and immunohistochemistry (IHC), we have confirmed specific expression in the E15.5 subplate for 13 selected genes, which have not been previously associated with this compartment (Abca8a, Cdh10, Cdh18, Csmd3, Gabra5, Kcnt2, Ogfrl1, Pls3, Rcan2, Sv2b, Slc8a2, Unc5c, and Zdhhc2). In the reeler mutant, the expression of the majority of these genes (9 of 13) was shifted in accordance with the altered position of subplate. These genes belong to several functional groups and likely contribute to synapse formation and axonal growth and guidance in subplate cells.
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Affiliation(s)
- Franziska M Oeschger
- Department of Physiology, Anatomy and Genetics, Oxford University, Oxford OX1 3QX, UK
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17
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Deschamps C, Morel M, Janet T, Page G, Jaber M, Gaillard A, Prestoz L. EphrinA5 protein distribution in the developing mouse brain. BMC Neurosci 2010; 11:105. [PMID: 20738842 PMCID: PMC2941684 DOI: 10.1186/1471-2202-11-105] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Accepted: 08/25/2010] [Indexed: 12/22/2022] Open
Abstract
Background EphrinA5 is one of the best-studied members of the Eph-ephrin family of guidance molecules, known to be involved in brain developmental processes. Using in situ hybridization, ephrinA5 mRNA expression has been detected in the retinotectal, the thalamocortical, and the olfactory systems; however, no study focused on the distribution of the protein. Considering that this membrane-anchored molecule may act far from the neuron soma expressing the transcript, it is of a crucial interest to localize ephrinA5 protein to better understand its function. Results Using immunohistochemistry, we found that ephrinA5 protein is highly expressed in the developing mouse brain from E12.5 to E16.5. The olfactory bulb, the cortex, the striatum, the thalamus, and the colliculi showed high intensity of labelling, suggesting its implication in topographic mapping of olfactory, retinocollicular, thalamocortical, corticothalamic and mesostriatal systems. In the olfactory nerve, we found an early ephrinA5 protein expression at E12.5 suggesting its implication in the guidance of primary olfactory neurons into the olfactory bulb. In the thalamus, we detected a dynamic graduated protein expression, suggesting its role in the corticothalamic patterning, whereas ephrinA5 protein expression in the target region of mesencephalic dopaminergic neurones indicated its involvement in the mesostriatal topographic mapping. Following E16.5, the signal faded gradually and was barely detectable at P0, suggesting a main role for ephrinA5 in primary molecular events in topographic map formation. Conclusion Our work shows that ephrinA5 protein is expressed in restrictive regions of the developing mouse brain. This expression pattern points out the potential sites of action of this molecule in the olfactory, retinotectal, thalamocortical, corticothalamic and mesostriatal systems, during development. This study is essential to better understand the role of ephrinA5 during developmental topographic mapping of connections and to further characterise the mechanisms involved in pathway restoration following cell transplantation in the damaged brain.
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Affiliation(s)
- Claire Deschamps
- Institut de Physiologie et Biologie Cellulaires, Université de Poitiers, CNRS, France
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18
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Demyanenko GP, Siesser PF, Wright AG, Brennaman LH, Bartsch U, Schachner M, Maness PF. L1 and CHL1 Cooperate in Thalamocortical Axon Targeting. ACTA ACUST UNITED AC 2010; 21:401-12. [PMID: 20576928 DOI: 10.1093/cercor/bhq115] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Neural cell adhesion molecule close homolog of L1 (CHL1) is a regulator of topographic targeting of thalamic axons to the somatosensory cortex (S1) but little is known about its cooperation with other L1 class molecules. To investigate this, CHL1(-/-)/L1(-/y) double mutant mice were generated and analyzed for thalamocortical axon topography. Double mutants exhibited a striking posterior shift of axons from motor thalamic nuclei to the visual cortex (V1), which was not observed in single mutants. In wild-type (WT) embryos, L1 and CHL1 were coexpressed in the dorsal thalamus (DT) and on fibers along the thalamocortical projection in the ventral telencephalon and cortex. L1 and CHL1 colocalized on growth cones and neurites of cortical and thalamic neurons in culture. Growth cone collapse assays with WT and mutant neurons demonstrated a requirement for L1 and CHL1 in repellent responses to EphrinA5, a guidance factor for thalamic axons. L1 coimmunoprecipitated with the principal EphrinA5 receptors expressed in the DT (EphA3, EphA4, and EphA7), whereas CHL1 associated selectively with EphA7. These results implicate a novel mechanism in which L1 and CHL1 interact with individual EphA receptors and cooperate to guide subpopulations of thalamic axons to distinct neocortical areas essential for thalamocortical connectivity.
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Affiliation(s)
- Galina P Demyanenko
- Department of Biochemistry and Biophysics, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA
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19
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Eto K, Kawauchi T, Osawa M, Tabata H, Nakajima K. Role of dual leucine zipper-bearing kinase (DLK/MUK/ZPK) in axonal growth. Neurosci Res 2009; 66:37-45. [PMID: 19808064 DOI: 10.1016/j.neures.2009.09.1708] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Revised: 08/27/2009] [Accepted: 09/27/2009] [Indexed: 01/30/2023]
Abstract
In developing cerebral cortices, post-mitotic neurons migrate toward the pial surface, elongating their axons concurrently. It has been reported that targeted-deletion of the dual leucine zipper-bearing kinase (DLK)/mitogen-activated protein kinase upstream protein kinase (MUK)/leucine-zipper protein kinase (ZPK) gene, which encodes a MAP kinase kinase kinase (MAPKKK) for c-Jun N-terminal kinase (JNK), leads to a neuronal migration-defect and hypoplasia of axonal fiber tracts including those of the anterior commissure and corpus callosum. However, there is no evidence that DLK directly regulates axonal development, because another possibility, i.e. that the defective axonal development in the DLK mutant might be caused secondary to migration failure cannot be ruled out. In this study, we first examined the distributions of DLK mRNA and its protein in the developing cerebral cortex, and found that major portion of DLK proteins appear to be transported into axons. Using dissociated cortical neurons and PC12 cells, we provide direct evidence that DLK regulates axonal elongation. Furthermore, knock-down of DLK decreased the phosphorylation of JNK and its substrate, microtubule-associated protein 1B (MAP1B), which is known to be involved in axonal elongation. These results suggest that the DLK/MUK/ZPK-JNK pathway directly regulates axonal growth through phosphorylation of MAP1B.
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Affiliation(s)
- Kaoru Eto
- Department of Anatomy, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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20
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Deschamps C, Faideau M, Jaber M, Gaillard A, Prestoz L. Expression of ephrinA5 during development and potential involvement in the guidance of the mesostriatal pathway. Exp Neurol 2009; 219:466-80. [DOI: 10.1016/j.expneurol.2009.06.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2008] [Revised: 06/18/2009] [Accepted: 06/24/2009] [Indexed: 01/12/2023]
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21
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Hu T, Shi G, Larose L, Rivera GM, Mayer BJ, Zhou R. Regulation of process retraction and cell migration by EphA3 is mediated by the adaptor protein Nck1. Biochemistry 2009; 48:6369-78. [PMID: 19505147 DOI: 10.1021/bi900831k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The Eph family of tyrosine kinase receptors and their ligands, the ephrins, participates in the regulation of a wide variety of biological functions under normal and pathological conditions. During embryonic development, interactions between the ligands and receptors define tissue boundaries, guide migrating axons, and regulate angiogenesis, as well as bone morphogenesis. These molecules have also been shown to modify neural activity in the adult nervous system and influence tumor progression. However, the molecular mechanisms underlying these diverse functions are not completely understood. In this study, we conducted a yeast two-hybrid screen to identify molecules that physically interact with Eph receptors using the cytoplasmic domain of EphA3 as "bait". This study identified Nck1 as a strong binding partner of EphA3 as assayed using both GST fusion protein pull down and co-immunoprecipitation techniques. The interaction is mediated through binding of the Nck1 SH2 domain to the phosphotyrosine residue at position 602 (Y602) of the EphA3 receptor. The removal of the SH2 domain or the mutation of the Y602 residue abolishes the interaction. We further demonstrated that EphA3 activation inhibits cell migration and process outgrowth, and these inhibiting effects are partially alleviated by dominant-negative Nck1 mutants that lack functional SH2 or SH3 domains, but not by the wild-type Nck1 gene. These results suggest that Nck1 interacts with EphA3 to regulate cell migration and process retraction.
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Affiliation(s)
- Tianjing Hu
- Department of Chemical Biology, College of Pharmacy, Rutgers University, Piscataway, New Jersey 08854, USA
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22
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Ho S, Kovačević N, Henkelman R, Boyd A, Pawson T, Henderson J. EphB2 and EphA4 receptors regulate formation of the principal inter-hemispheric tracts of the mammalian forebrain. Neuroscience 2009; 160:784-95. [DOI: 10.1016/j.neuroscience.2009.03.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2008] [Revised: 02/25/2009] [Accepted: 03/05/2009] [Indexed: 11/25/2022]
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Hatanaka Y, Matsumoto T, Yanagawa Y, Fujisawa H, Murakami F, Masu M. Distinct roles of neuropilin 1 signaling for radial and tangential extension of callosal axons. J Comp Neurol 2009; 514:215-25. [PMID: 19296474 DOI: 10.1002/cne.22021] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Cortical excitatory neurons migrate from their origin in the ventricular zone (VZ) toward the pial surface. During migration, these neurons exhibit a stellate shape in the intermediate zone (IZ), transform into bipolar cells, and then initiate radial migration, extending a trailing process, which may lead to an axon. Here we examined the role of neuropilin 1 (NRP1) in these developmental events. Both NRP1 mRNA and protein were highly expressed in the IZ, where stellate-shaped cells were located. DiI labeling experiments showed that neuronal migration occurred normally in Nrp1 mutant mice up to embryonic day (E) 14.5, the latest day to which the mutant survives, with only subtle axonal defasciculation. However, interference with Nrp1 signaling at a later stage caused pathfinding errors: when a dominant negative form of Nrp1 was electroporated into the cortical VZ cells at E12.5 or E15.5 and examined perinatally, guidance errors were found in tangential axonal extension toward the midline. In contrast, no significant effect was noted on the migration of cortical excitatory neurons. These findings indicate that NRP1 plays an important role in the guidance of callosal axons originating from cortical excitatory neurons but does not support a role in their migration. Moreover, insofar as radial axonal extension within the cortical plate was unaffected, the present findings imply that molecular mechanisms for the axonal extension of excitatory neurons within the cortical plate are distinct from those in the white matter.
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Affiliation(s)
- Yumiko Hatanaka
- Department of Molecular Neurobiology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.
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24
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Wolf LV, Yang Y, Wang J, Xie Q, Braunger B, Tamm ER, Zavadil J, Cvekl A. Identification of pax6-dependent gene regulatory networks in the mouse lens. PLoS One 2009; 4:e4159. [PMID: 19132093 PMCID: PMC2612750 DOI: 10.1371/journal.pone.0004159] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Accepted: 11/21/2008] [Indexed: 11/20/2022] Open
Abstract
Lineage-specific DNA-binding transcription factors regulate development by activating and repressing particular set of genes required for the acquisition of a specific cell type. Pax6 is a paired domain and homeodomain-containing transcription factor essential for development of central nervous, olfactory and visual systems, as well as endocrine pancreas. Haploinsufficiency of Pax6 results in perturbed lens development and homeostasis. Loss-of-function of Pax6 is incompatible with lens lineage formation and results in abnormal telencephalic development. Using DNA microarrays, we have identified 559 genes expressed differentially between 1-day old mouse Pax6 heterozygous and wild type lenses. Of these, 178 (31.8%) were similarly increased and decreased in Pax6 homozygous embryonic telencephalon [Holm PC, Mader MT, Haubst N, Wizenmann A, Sigvardsson M, Götz M (2007) Loss- and gain-of-function analyses reveals targets of Pax6 in the developing mouse telencephalon. Mol Cell Neurosci 34: 99–119]. In contrast, 381 (68.2%) genes were differently regulated between the lens and embryonic telencephalon. Differential expression of nine genes implicated in lens development and homeostasis: Cspg2, Igfbp5, Mab21l2, Nrf2f, Olfm3, Spag5, Spock1, Spon1 and Tgfb2, was confirmed by quantitative RT-PCR, with five of these genes: Cspg2, Mab21l2, Olfm3, Spag5 and Tgfb2, identified as candidate direct Pax6 target genes by quantitative chromatin immunoprecipitation (qChIP). In Mab21l2 and Tgfb2 promoter regions, twelve putative individual Pax6-binding sites were tested by electrophoretic mobility shift assays (EMSAs) with recombinant Pax6 proteins. This led to the identification of two and three sites in the respective Mab21l2 and Tgfb2 promoter regions identified by qChIPs. Collectively, the present studies represent an integrative genome-wide approach to identify downstream networks controlled by Pax6 that control mouse lens and forebrain development.
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Affiliation(s)
- Louise V. Wolf
- The Departments of Ophthalmology and Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Ying Yang
- The Departments of Ophthalmology and Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Jinhua Wang
- NYU Cancer Institute, New York University Langone Medical Center, New York, New York, United States of America
| | - Qing Xie
- The Departments of Ophthalmology and Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, New York, United States of America
| | - Barbara Braunger
- Institute of Human Anatomy and Embryology, University of Regensburg, Regensburg, Germany
| | - Ernst R. Tamm
- Institute of Human Anatomy and Embryology, University of Regensburg, Regensburg, Germany
| | - Jiri Zavadil
- NYU Cancer Institute, New York University Langone Medical Center, New York, New York, United States of America
- Department of Pathology, New York University Langone Medical Center, New York, New York, United States of America
| | - Ales Cvekl
- The Departments of Ophthalmology and Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, New York, United States of America
- * E-mail:
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25
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Hevner RF. Layer-specific markers as probes for neuron type identity in human neocortex and malformations of cortical development. J Neuropathol Exp Neurol 2007; 66:101-9. [PMID: 17278994 DOI: 10.1097/nen.0b013e3180301c06] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Malformations of cortical development (MCDs) are heterogeneous disorders caused by abnormalities of cell proliferation, apoptosis, cell migration, cortical organization, and axon pathfinding. In severe MCDs, the cerebral cortex can appear completely disorganized, or may be replaced by aberrant laminar patterns, as in "4-layered" types of lissencephaly and polymicrogyria. Little is known about the abnormal layers in MCDs and whether they bear any relation to normal cortical layers or how MCDs affect specific neuron types. Normally, each layer contains a defined mixture of different types of pyramidal and nonpyramidal neurons. The neuron types are distinguished by molecular expression as well as morphologic, neurochemical, and electrophysiologic criteria. Patterns of layer-specific mRNA and protein expression reflect the segregation of different neuron types into different layers (e.g. corticospinal projection neurons in layer V). Numerous layer-specific markers have been described in rodent cortex, and increasing numbers are being documented in human and monkey cortex. Applied to MCDs, layer-specific markers have the potential to reveal new insights on pathogenesis, treatment possibilities, and genotype-phenotype correlations. However, much work remains before layer-specific markers become practical tools in diagnostic neuropathology. Additional markers, more extensive documentation of normal expression, and better antibodies compatible with paraffin-embedded tissues will be necessary.
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Affiliation(s)
- Robert F Hevner
- Department of Pathology, University of Washington, Seattle, Washington, USA.
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26
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Auger N, Thillet J, Wanherdrick K, Idbaih A, Legrier ME, Dutrillaux B, Sanson M, Poupon MF. Genetic alterations associated with acquired temozolomide resistance in SNB-19, a human glioma cell line. Mol Cancer Ther 2006; 5:2182-92. [PMID: 16985051 DOI: 10.1158/1535-7163.mct-05-0428] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Gliomas are highly lethal neoplasms that cannot be cured by currently available therapies. Temozolomide is a recently introduced alkylating agent that has yielded a significant benefit in the treatment of high-grade gliomas. However, either de novo or acquired chemoresistance occurs frequently and has been attributed to increased levels of O6-methylguanine-DNA methyltransferase or to the loss of mismatch repair capacity. However, very few gliomas overexpress O6-methylguanine-DNA methyltransferase or are mismatch repair-deficient, suggesting that other mechanisms may be involved in the resistance to temozolomide. The purpose of the present study was to generate temozolomide-resistant variants from a human glioma cell line (SNB-19) and to use large-scale genomic and transcriptional analyses to study the molecular basis of acquired temozolomide resistance. Two independently obtained temozolomide-resistant variants exhibited no cross-resistance to other alkylating agents [1,3-bis(2-chloroethyl)-1-nitrosourea and carboplatin] and shared genetic alterations, such as loss of a 2p region and loss of amplification of chromosome 4 and 16q regions. The karyotypic alterations were compatible with clonal selection of preexistent resistant cells in the parental SNB-19 cell line. Microarray analysis showed that 78 out of 17,000 genes were differentially expressed between parental cells and both temozolomide-resistant variants. None are implicated in known resistance mechanisms, such as DNA repair, whereas interestingly, several genes involved in differentiation were down-regulated. The data suggest that the acquisition of resistance to temozolomide in this model resulted from the selection of less differentiated preexistent resistant cells in the parental tumor.
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Affiliation(s)
- Nathalie Auger
- INSERM U612, Research Section, Institut Curie, 26 rue d'Ulm, 75248 Paris Cedex 05, France
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27
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Miller K, Kolk SM, Donoghue MJ. EphA7-ephrin-A5 signaling in mouse somatosensory cortex: developmental restriction of molecular domains and postnatal maintenance of functional compartments. J Comp Neurol 2006; 496:627-42. [PMID: 16615124 DOI: 10.1002/cne.20926] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Members of the Eph family of receptor tyrosine kinases and their ligands, the ephrins, are expressed in distinct patterns in the forming cortex. EphA7 is expressed early in cortical development, becoming concentrated in anterior and posterior domains, whereas ephrin-A5 is expressed later in corticogenesis, highest in the middle region that has low levels of EphA7. The EphA7 gene produces full-length and truncated isoforms, which are repulsive and adhesive, respectively. Analysis of cortical RNA expression demonstrates that proportions of these isoforms change with time, from a more repulsive mix during embryogenesis to a more permissive mix postnatally. To examine how EphA7 and ephrin-A5 influence the formation of cortical regions, EphA7-/- mice were analyzed. Within the cortex of EphA7-/- mice, the distribution of ephrin-A5 was more extensive, encompassing its usual medial domain but also extending more posteriorly toward the occipital pole. Moreover, relative levels of ephrin-A5 along the cortex's anatomical axes changed in EphA7-/- animals, creating less striking shifts in ligand abundance. Furthermore, in vivo functional studies revealed that EphA7 exerts a repulsive influence on ephrin-A5-expressing cells during corticogenesis. In contrast, EphA7 appears to mediate permissive interactions in the postnatal cortex: the area of somatosensory cortex was significantly reduced in EphA7-/- mice. A similar reduction was present in ephrin-A5-/- animals and a more pronounced decrease was observed in EphA7/ephrin-A5-/- cortex. Taken together, this study supports a role for EphA7 and ephrin-A5 in the establishment and maintenance of certain cortical domains and suggests that the nature of their interactions changes with cortical maturity.
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Affiliation(s)
- Katherine Miller
- Department of Neurobiology, Yale University School of Medicine, New Haven, CT 06520, USA
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28
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Mendes SW, Henkemeyer M, Liebl DJ. Multiple Eph receptors and B-class ephrins regulate midline crossing of corpus callosum fibers in the developing mouse forebrain. J Neurosci 2006; 26:882-92. [PMID: 16421308 PMCID: PMC6675355 DOI: 10.1523/jneurosci.3162-05.2006] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Agenesis of the corpus callosum (CC) is a rare birth defect that occurs in isolated conditions and in combination with other developmental cerebral abnormalities. Recent identification of families of growth and guidance molecules has generated interest in the mechanisms that regulate callosal growth. One family, ephrins and Eph receptors, has been implicated in mediating midline pathfinding decisions; however, the complexity of these interactions has yet to be unraveled. Our studies shed light on which B-class ephrins and Eph receptors function to regulate CC midline growth and how these molecules interact with important guideposts during development. We show that multiple Eph receptors (B1, B2, B3, and A4) and B-class ephrins (B1, B2, and B3) are present and function in developing forebrain callosal fibers based on both spatial and temporal expression patterns and analysis of gene-targeted knock-out mice. Defects are most pronounced in the combination double knock-out mice, suggesting that compensatory mechanisms exist for several of these family members. Furthermore, these CC defects range from mild hypoplasia to complete agenesis and Probst's bundle formation. Further analysis revealed that Probst's bundle formation may reflect aberrant glial formations and/or altered sensitivity of CC axons to other guidance cues. Our results support a significant role for ephrins and Eph receptors in CC development and may provide insight to possible mechanisms involved in axon midline crossing and human disorder.
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Affiliation(s)
- Shannon W Mendes
- Neuroscience Program, University of Miami Miller School of Medicine, Miami, Florida 33136, USA
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29
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Ajioka I, Nakajima K. Switching of alpha-catenin from alphaE-catenin in the cortical ventricular zone to alphaN-catenin II in the intermediate zone. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 2005; 160:106-11. [PMID: 16185771 DOI: 10.1016/j.devbrainres.2005.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2005] [Revised: 08/05/2005] [Accepted: 08/07/2005] [Indexed: 10/25/2022]
Abstract
Although cadherins and catenins are known to play important roles during neural development, the types of alpha-catenin present in the developing telencephalon are still unknown. Here, we show that the ventricular zones (VZ) of the cortex and the ganglionic eminences express alphaE-catenin and alphaN-catenin, respectively, in a complementary manner. In the cortex, alpha-catenin is switched from alphaE-catenin in the VZ to alphaN-catenin II in the intermediate zone (IMZ).
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Affiliation(s)
- Itsuki Ajioka
- Department of Anatomy, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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30
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Ajioka I, Nakajima K. Birth-date-dependent segregation of the mouse cerebral cortical neurons in reaggregation cultures. Eur J Neurosci 2005; 22:331-42. [PMID: 16045486 DOI: 10.1111/j.1460-9568.2005.04214.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cerebral cortical neurons form a six-layered structure in which their position depends on their birth date. This developmental process requires the presence of Reelin, which is secreted by Cajal-Retzius cells in the cortical marginal zone (MZ). However, it is still unclear whether the migration from the ventricular zone (VZ) to beneath the MZ is essential for the neurons to segregate into layers. Previous transplantation studies of ferret cerebral cortical neurons suggested that their ultimate laminar fate is, at least to some extent, determined in the VZ but it is unknown how 'laminar fate' eventually positions cells in a specific layer. To explore the segregation properties of mouse cortical cells that have not yet arrived beneath the MZ, embryonic day (E)16 VZ and intermediate zone (IMZ) cells were dissociated and allowed to reaggregate for 1-4 days in vitro. The results suggested that the migrating neurons in the IMZ at E16 preferentially located near the centre of the aggregates, more than did the proliferative cells from the VZ. The birth-date labelling followed by the dissociation-reaggregation culture suggested that the segregation properties of the E16 IMZ was characteristic of the E14-born cells, which were migrating in the IMZ at E16, but they were not general properties of migrating IMZ cells. This birth-date-dependent segregation mechanism was also observed in the Reelin signalling-deficient yotari cells. These findings suggest that cortical neurons acquire a birth-date-dependent segregation mechanism before their somas reach the MZ.
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Affiliation(s)
- Itsuki Ajioka
- Department of Anatomy, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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