1
|
Wu F, Huang F, Jiang N, Su J, Yao S, Liang B, Li W, Yan T, Zhou S, Zhou Q. Identification of ferroptosis related genes and pathways in prostate cancer cells under erastin exposure. BMC Urol 2024; 24:78. [PMID: 38575966 PMCID: PMC10996193 DOI: 10.1186/s12894-024-01472-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 03/31/2024] [Indexed: 04/06/2024] Open
Abstract
BACKGROUND Few studies are focusing on the mechanism of erastin acts on prostate cancer (PCa) cells, and essential ferroptosis-related genes (FRGs) that can be PCa therapeutic targets are rarely known. METHODS In this study, in vitro assays were performed and RNA-sequencing was used to measure the expression of differentially expressed genes (DEGs) in erastin-induced PCa cells. A series of bioinformatic analyses were applied to analyze the pathways and DEGs. RESULTS Erastin inhibited the expression of SLC7A11 and cell survivability in LNCaP and PC3 cells. After treatment with erastin, the concentrations of malondialdehyde (MDA) and Fe2+ significantly increased, whereas the glutathione (GSH) and the oxidized glutathione (GSSG) significantly decreased in both cells. A total of 295 overlapping DEGs were identified under erastin exposure and significantly enriched in several pathways, including DNA replication and cell cycle. The percentage of LNCaP and PC3 cells in G1 phase was markedly increased in response to erastin treatment. For four hub FRGs, TMEFF2 was higher in PCa tissue and the expression levels of NRXN3, CLU, and UNC5B were lower in PCa tissue. The expression levels of SLC7A11 and cell survivability were inhibited after the knockdown of TMEFF2 in androgen-dependent cell lines (LNCaP and VCaP) but not in androgen-independent cell lines (PC3 and C4-2). The concentration of Fe2+ only significantly increased in TMEFF2 downregulated LNCaP and VCaP cells. CONCLUSION TMEFF2 might be likely to develop into a potential ferroptosis target in PCa and this study extends our understanding of the molecular mechanism involved in erastin-affected PCa cells.
Collapse
Affiliation(s)
- Fan Wu
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China
| | - Fei Huang
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China
| | - Nili Jiang
- Life Sciences Institute, Guangxi Medical University, Nanning, China
| | - Jinfeng Su
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China
| | - Siyi Yao
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China
| | - Boying Liang
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China
| | - Wen Li
- Life Sciences Institute, Guangxi Medical University, Nanning, China
| | - Tengyue Yan
- Life Sciences Institute, Guangxi Medical University, Nanning, China
| | - Sufang Zhou
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China.
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China.
| | - Qingniao Zhou
- Department of Biochemistry and Molecular Biology, School of Pre-Clinical Medicine, Guangxi Medical University, Nanning, China.
- Key Laboratory of Biological Molecular Medicine Research, Education Department of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China.
| |
Collapse
|
2
|
Prajapati K, Yan C, Yang Q, Arbitman S, Fitzgerald DP, Sharee S, Shaik J, Bosiacki J, Myers K, Paucarmayta A, Johnson DM, O’Neill T, Kundu S, Cusumano Z, Langermann S, Langenau DM, Patel S, Flies DB. The FLRT3-UNC5B checkpoint pathway inhibits T cell-based cancer immunotherapies. Sci Adv 2024; 10:eadj4698. [PMID: 38427724 PMCID: PMC10906930 DOI: 10.1126/sciadv.adj4698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 01/25/2024] [Indexed: 03/03/2024]
Abstract
Cancers exploit coinhibitory receptors on T cells to escape tumor immunity, and targeting such mechanisms has shown remarkable clinical benefit, but in a limited subset of patients. We hypothesized that cancer cells mimic noncanonical mechanisms of early development such as axon guidance pathways to evade T cell immunity. Using gain-of-function genetic screens, we profiled axon guidance proteins on human T cells and their cognate ligands and identified fibronectin leucine-rich transmembrane protein 3 (FLRT3) as a ligand that inhibits T cell activity. We demonstrated that FLRT3 inhibits T cells through UNC5B, an axon guidance receptor that is up-regulated on activated human T cells. FLRT3 expressed in human cancers favored tumor growth and inhibited CAR-T and BiTE + T cell killing and infiltration in humanized cancer models. An FLRT3 monoclonal antibody that blocked FLRT3-UNC5B interactions reversed these effects in an immune-dependent manner. This study supports the concept that axon guidance proteins mimic T cell checkpoints and can be targeted for cancer immunotherapy.
Collapse
Affiliation(s)
| | - Chuan Yan
- Molecular Pathology and Cancer Center, Massachusetts General Hospital Research Institute, Charlestown, MA 02129, USA
- Harvard Stem Cell Institute, Cambridge, MA 02139, USA
| | - Qiqi Yang
- Molecular Pathology and Cancer Center, Massachusetts General Hospital Research Institute, Charlestown, MA 02129, USA
- Harvard Stem Cell Institute, Cambridge, MA 02139, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | - David M. Langenau
- Molecular Pathology and Cancer Center, Massachusetts General Hospital Research Institute, Charlestown, MA 02129, USA
- Harvard Stem Cell Institute, Cambridge, MA 02139, USA
| | | | | |
Collapse
|
3
|
He Y, Huang X, Ma Y, Yang G, Cui Y, Lv X, Zhao R, Jin H, Tong Y, Zhang X, Li J, Peng M. A novel aging-associated lncRNA signature for predicting prognosis in osteosarcoma. Sci Rep 2024; 14:1386. [PMID: 38228673 PMCID: PMC10791644 DOI: 10.1038/s41598-024-51732-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 01/09/2024] [Indexed: 01/18/2024] Open
Abstract
Osteosarcoma (OS) is one of the most prevalent bone tumors in adolescents, and the correlation between aging and OS remains unclear. Currently, few accurate and reliable biomarkers have been determined for OS prognosis. To address this issue, we carried out a detailed bioinformatics analysis based on OS with data from the Cancer Genome Atlas data portal and Human Aging Genomic Resources database, as well as in vitro experiments. A total of 88 OS samples with gene expression profiles and corresponding clinical characteristics were obtained. Through univariate Cox regression analysis and survival analysis, 10 aging-associated survival lncRNAs (AASRs) were identified to be associated with the overall survival of OS patients. Based on the expression levels of the 10 AASRs, the OS patients were classified into two clusters (Cluster A and Cluster B). Cluster A had a worse prognosis, while Cluster B had a better prognosis. Then, 5 AASRs were ultimately included in the signature through least absolute shrinkage and selection operator-Cox regression analysis. Kaplan‒Meier survival analysis verified that the high-risk group exhibited a worse prognosis than the low-risk group. Furthermore, univariate and multivariate Cox regression analyses confirmed that the riskScore was an independent prognostic factor for OS patients. Subsequently, we discovered that the risk signature was correlated with the properties of the tumor microenvironment and immune cell infiltration. Specifically, there was a positive association between the risk model and naïve B cells, resting dendritic cells and gamma delta T cells, while it was negatively related to CD8+ T cells. Finally, in vitro experiments, we found that UNC5B-AS1 inhibited OS cells from undergoing cellular senescence and apoptosis, thereby promoting OS cells proliferation. In conclusion, we constructed and verified a 5 AASR-based signature, that exhibited excellent performance in evaluating the overall survival of OS patients. In addition, we found that UNC5B-AS1 might inhibit the senescence process, thus leading to the development and progression of OS. Our findings may provide novel insights into the treatment of OS patients.
Collapse
Affiliation(s)
- Yi He
- Department of Mini-Invasive Spinal Surgery, The Third People's Hospital of Henan Province, Zhengzhou, 450006, Henan, China
| | - Xiao Huang
- Department of Clinical Laboratory, Luohe Central Hospital, Luohe, 462300, Henan, China
| | - Yajie Ma
- Department of Medical Affair, The Third People's Hospital of Henan Province, Zhengzhou, 450006, Henan, China
| | - Guohui Yang
- Department of Emergency Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Yuqing Cui
- General ICU, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Xuefeng Lv
- Department of Clinical Laboratory, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Rongling Zhao
- Department of Clinical Laboratory, The Third People's Hospital of Henan Province, Zhengzhou, 450006, Henan, China
| | - Huifang Jin
- Department of Blood Transfusion, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Yalin Tong
- Department of Digestion, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Xinyu Zhang
- Department of Medical Affair, The Third People's Hospital of Henan Province, Zhengzhou, 450006, Henan, China
| | - Jitian Li
- Henan Luoyang Orthopedic Hospital (Henan Provincial Orthopedic Hospital), Henan Provincial Orthopedic Institute, Henan University of Chinese Medicine, 100 Yongping Road, Zhengzhou, 450000, Henan, China.
| | - Mengle Peng
- Department of Clinical Laboratory, The Third People's Hospital of Henan Province, Zhengzhou, 450006, Henan, China.
| |
Collapse
|
4
|
Vennela J, Pottakkat B, Vairappan BS, Verma SK, Mukherjee V. Hepatic Expression of NTN4 and Its Receptors in Patients with Hepatocellular Carcinoma. Asian Pac J Cancer Prev 2023; 24:4285-4292. [PMID: 38156865 PMCID: PMC10909082 DOI: 10.31557/apjcp.2023.24.12.4285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 12/09/2023] [Indexed: 01/03/2024] Open
Abstract
BACKGROUND Angiogenesis contributes to hepatocellular carcinoma (HCC) progression by promoting tumor growth and metastasis. Netrin-4 (NTN4) is a secreted glycoprotein that has been reported to control angiogenesis and preserve endothelial homeostasis. Macrovascular invasion of the portal vein, referred to as portal vein invasion (PVI) is associated with poor prognosis in HCC patients. In this work, we sought to understand more about the systemic and hepatic level expression of NTN4 and its receptors in HCC patients with and without portal vein invasion. METHODS A total of 154 patients with HCC, and 90 healthy volunteers were recruited in this case-control study. Patients with HCC were further subdivided into those with portal vein invasion (PVI) (n=68), and those without portal vein invasion (NPVI) (n=86). Clinical characteristics and liver function parameters were recorded among the study subjects PVI and NPVI. The serum levels of NTN4 (pg/ml) were estimated by ELISA. HCC tissues and normal non-tumorous liver tissues (controls) were collected for gene expression analysis of NTN4 and its receptors. RESULTS ALT, ALP, and GGT levels were significantly elevated in the serum of HCC patients with PVI compared to NPVI and control subjects. Systemic NTN4 was significantly reduced in both PVI and NPVI patients compared to control subjects. At the tissue level, the hepatic NTN4 followed a similar trend with significantly lower mRNA expression in both patients with PVI and NPVI compared to control subjects. CONCLUSIONS Systemic and hepatic NTN4 levels were reduced in both PVI and NPVI subjects. The hepatic expression of NTN4 receptors Neogenin and UNC5B were markedly elevated in patients with HCC with PVI compared to NPVI. Future experimental studies might shed the role of NTN4 and its receptors in the development of PVI in HCC.
Collapse
Affiliation(s)
- Jyothi Vennela
- Department of Surgical Gastroenterology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.
| | - Biju Pottakkat
- Department of Surgical Gastroenterology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.
| | - Bala subramaniyan Vairappan
- Department of Biochemistry, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.
| | - Surendra Kumar Verma
- Department of Pathology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.
| | - Victor Mukherjee
- Department of Biochemistry, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.
| |
Collapse
|
5
|
Dudgeon C, Casabianca A, Harris C, Ogier C, Bellina M, Fiore S, Bernet A, Ducarouge B, Goldschneider D, Su X, Pitarresi J, Hezel A, De S, Narrow W, Soliman F, Shields C, Vendramini-Costa DB, Prela O, Wang L, Astsaturov I, Mehlen P, Carpizo DR. Netrin-1 feedforward mechanism promotes pancreatic cancer liver metastasis via hepatic stellate cell activation, retinoid, and ELF3 signaling. Cell Rep 2023; 42:113369. [PMID: 37922311 DOI: 10.1016/j.celrep.2023.113369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 09/04/2023] [Accepted: 10/18/2023] [Indexed: 11/05/2023] Open
Abstract
The biology of metastatic pancreatic ductal adenocarcinoma (PDAC) is distinct from that of the primary tumor due to changes in cell plasticity governed by a distinct transcriptome. Therapeutic strategies that target this distinct biology are needed. We detect an upregulation of the neuronal axon guidance molecule Netrin-1 in PDAC liver metastases that signals through its dependence receptor (DR), uncoordinated-5b (Unc5b), to facilitate metastasis in vitro and in vivo. The mechanism of Netrin-1 induction involves a feedforward loop whereby Netrin-1 on the surface of PDAC-secreted extracellular vesicles prepares the metastatic niche by inducing hepatic stellate cell activation and retinoic acid secretion that in turn upregulates Netrin-1 in disseminated tumor cells via RAR/RXR and Elf3 signaling. While this mechanism promotes PDAC liver metastasis, it also identifies a therapeutic vulnerability, as it can be targeted using anti-Netrin-1 therapy to inhibit metastasis using the Unc5b DR cell death mechanism.
Collapse
Affiliation(s)
- Crissy Dudgeon
- Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, USA
| | - Anthony Casabianca
- Department of Surgery, Division of Surgical Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA; Wilmot Cancer Center, University of Rochester, Rochester, NY, USA
| | - Chris Harris
- Department of Surgery, Division of Surgical Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA; Wilmot Cancer Center, University of Rochester, Rochester, NY, USA
| | - Charline Ogier
- Department of Medical Oncology, Fox Chase Cancer Center, Philadelphia, PA, USA
| | - Mélanie Bellina
- Apoptosis, Cancer and Development Laboratory - Equipe labellisée "La Ligue," LabEx DEVweCAN, Institut Convergence PLAsCAN, Centre de Recherche en Cancérologie de Lyon (CRCL), INSERM U1052-CNRS UMR5286, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, 69008 Lyon, France; Netris Pharma, 69008 Lyon, France
| | - Stephany Fiore
- Apoptosis, Cancer and Development Laboratory - Equipe labellisée "La Ligue," LabEx DEVweCAN, Institut Convergence PLAsCAN, Centre de Recherche en Cancérologie de Lyon (CRCL), INSERM U1052-CNRS UMR5286, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, 69008 Lyon, France
| | - Agnes Bernet
- Apoptosis, Cancer and Development Laboratory - Equipe labellisée "La Ligue," LabEx DEVweCAN, Institut Convergence PLAsCAN, Centre de Recherche en Cancérologie de Lyon (CRCL), INSERM U1052-CNRS UMR5286, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, 69008 Lyon, France; Netris Pharma, 69008 Lyon, France
| | | | | | - Xiaoyang Su
- Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, USA
| | - Jason Pitarresi
- Department of Medicine, Division of Hematology/Oncology, University of Massachusetts, Worcester, MA, USA
| | - Aram Hezel
- Department of Medicine, Division of Medical Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
| | - Subhajyoti De
- Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, USA
| | - Wade Narrow
- Department of Surgery, Division of Surgical Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA; Wilmot Cancer Center, University of Rochester, Rochester, NY, USA
| | - Fady Soliman
- Rutgers Robert Wood-Johnson Medical School, New Brunswick, NJ, USA
| | - Cory Shields
- Wilmot Cancer Center, University of Rochester, Rochester, NY, USA
| | | | - Orjola Prela
- Department of Surgery, Division of Surgical Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
| | - Lan Wang
- Department of Pathology and Laboratory Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
| | - Igor Astsaturov
- Department of Medical Oncology, Fox Chase Cancer Center, Philadelphia, PA, USA
| | - Patrick Mehlen
- Apoptosis, Cancer and Development Laboratory - Equipe labellisée "La Ligue," LabEx DEVweCAN, Institut Convergence PLAsCAN, Centre de Recherche en Cancérologie de Lyon (CRCL), INSERM U1052-CNRS UMR5286, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, 69008 Lyon, France; Netris Pharma, 69008 Lyon, France
| | - Darren R Carpizo
- Department of Surgery, Division of Surgical Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA; Wilmot Cancer Center, University of Rochester, Rochester, NY, USA.
| |
Collapse
|
6
|
Jensen ET, Langefeld CD, Howard TD, Dellon ES. Validation of Epigenetic Markers for the Prediction of Response to Topical Corticosteroid Treatment in Eosinophilic Esophagitis. Clin Transl Gastroenterol 2023; 14:e00622. [PMID: 37439560 PMCID: PMC10522102 DOI: 10.14309/ctg.0000000000000622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/07/2023] [Accepted: 07/06/2023] [Indexed: 07/14/2023] Open
Abstract
INTRODUCTION We previously identified 18 CpG methylation biomarkers associated with treatment response to topical corticosteroids (tCS) in eosinophilic esophagitis (EoE). In this study, in an independent cohort, we assessed the validity of these CpG sites as treatment response biomarkers. METHODS DNA was extracted from prospectively biobanked esophageal biopsies from patients with newly diagnosed EoE enrolled in a randomized trial of 2 tCS formulations. Histologic response was defined as <15 eosinophils per high-power field. Pretreatment DNA methylation was assayed on the Illumina Human MethylationEPIC BeadChip. Logistic regression and area under the receiver operating characteristic curve analyses, adjusting for chip, position on the chip, age, sex, and baseline eosinophil count, were computed to test for an association between DNA methylation and treatment response at the 18 previously identified CpG sites. RESULTS We analyzed 88 patients (58 histologic responders, 30 nonresponders), with a mean age of 38 ± 16 years, 64% male, 97% White race. Of the 18 CpG sites, 13 met quality control criteria, and 3 were associated with responder status ( P < 0.012), including sites within UNC5B (cg26152017), ITGA6 (cg01044293), and LRRC8A (cg13962589). All 3 showed evidence of reduced methylation in treatment responders, consistent with the original discovery associations. The predictive probability for nonresponse with all 3 CpG sites was strong (area under the receiver operating characteristic curve = 0.79). DISCUSSION We validated epigenetic biomarkers (CpG methylation sites) for the prediction of tCS response in patients with EoE in an independent population. While not all previously identified markers replicated, 3 demonstrated a relatively high predictive probability for response to treatment and hold promise for guiding tCS treatment in EoE.
Collapse
Affiliation(s)
- Elizabeth T. Jensen
- Department of Epidemiology and Prevention, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- Division of Gastroenterology and Hepatology, Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - Carl D. Langefeld
- Department of Biostatistics and Data Science, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- Wake Forest University School of Medicine, Center for Precision Medicine, Winston-Salem, North Carolina USA
| | - Timothy D. Howard
- Wake Forest University School of Medicine, Center for Precision Medicine, Winston-Salem, North Carolina USA
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - Evan S. Dellon
- Division of Gastroenterology and Hepatology, Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| |
Collapse
|
7
|
Al-Janabi A, Eyre S, Foulkes AC, Khan AR, Dand N, Burova E, DeSilva B, Makrygeorgou A, Davies E, Smith CH, Griffiths CEM, Morris AP, Warren RB. Atopic Polygenic Risk Score Is Associated with Paradoxical Eczema Developing in Patients with Psoriasis Treated with Biologics. J Invest Dermatol 2023; 143:1470-1478.e1. [PMID: 36804406 DOI: 10.1016/j.jid.2023.01.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 02/17/2023]
Abstract
Biologic therapies for psoriasis can cause paradoxical eczema. The role of genetic factors in its pathogenesis is unknown. To identify risk variants, we conducted a GWAS of 3,212 patients with psoriasis, of whom 88 developed paradoxical eczema. Two lead SNPs reached genome-wide significance (P ≤ 5 × 10-8) for association with paradoxical eczema: rs192705221 (near UNC5B, P = 9.52 × 10-10) and rs72925168 (within SLC1A2, P = 1.66 × 10-9). Genome-wide significant SNPs from published GWAS were used to generate polygenic risk scores (PRSs) for atopic eczema, general atopic disease, or a combination, which were tested for association with paradoxical eczema. Improvement over a clinical risk model was assessed by the area under the curve. All three atopy polygenic risk scores were associated with paradoxical eczema (P < 0.05); polygenic risk score for a combination of atopic eczema and general atopic disease had the strongest association (OR = 1.83, 95% CI = 1.17-2.84, P = 0.0078). Including atopic polygenic risk scores in the multivariable model, which included age, sex, atopic background, and psoriatic arthritis history, increased the area under the curve from 0.671 to 0.681-0.686. Atopic genetic burden is associated with paradoxical eczema occurring in biologic-treated patients with psoriasis, indicating shared underlying mechanisms. Incorporating genetic risk may improve treatment outcome prediction models for psoriasis.
Collapse
Affiliation(s)
- Ali Al-Janabi
- Centre for Dermatology Research, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical Research Centre, The University of Manchester, Manchester, United Kingdom.
| | - Steve Eyre
- Centre for Dermatology Research, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical Research Centre, The University of Manchester, Manchester, United Kingdom; Centre for Genetics & Genomics Versus Arthritis, The University of Manchester, Manchester, United Kingdom; Centre for Musculoskeletal Research, The University of Manchester, Manchester, United Kingdom
| | - Amy C Foulkes
- Centre for Dermatology Research, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical Research Centre, The University of Manchester, Manchester, United Kingdom
| | | | - Nick Dand
- Department of Medical & Molecular Genetics, Faculty of Life Sciences and Medicine, School of Basic & Medical Biosciences, King's College London, London, United Kingdom
| | - Ekaterina Burova
- Dermatology, Bedfordshire Hospitals NHS Trust, Bedford, United Kingdom
| | - Bernadette DeSilva
- Department of Dermatology, Luton and Dunstable University Hospital, Luton, United Kingdom
| | - Areti Makrygeorgou
- Dermatology Department, West Ambulatory Care Hospital, Glasgow, United Kingdom
| | - Emily Davies
- Department of Dermatology, Gloucester Royal Hospital, Gloucester, United Kingdom
| | - Catherine H Smith
- St. John's Institute of Dermatology, Faculty of Life Sciences and Medicine, School of Basic and Medical Biosciences, King's College London, London, United Kingdom; St. John's Institute of Dermatology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Christopher E M Griffiths
- Centre for Dermatology Research, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical Research Centre, The University of Manchester, Manchester, United Kingdom
| | - Andrew P Morris
- Centre for Genetics & Genomics Versus Arthritis, The University of Manchester, Manchester, United Kingdom; Centre for Musculoskeletal Research, The University of Manchester, Manchester, United Kingdom
| | - Richard B Warren
- Centre for Dermatology Research, Salford Royal NHS Foundation Trust, NIHR Manchester Biomedical Research Centre, The University of Manchester, Manchester, United Kingdom
| |
Collapse
|
8
|
Gabir H, Gupta M, Meier M, Heide F, Koch M, Stetefeld J, Demeler B. Investigation of dynamic solution interactions between NET-1 and UNC-5B by multi-wavelength analytical ultracentrifugation. Eur Biophys J 2023; 52:473-481. [PMID: 36939874 PMCID: PMC10509325 DOI: 10.1007/s00249-023-01644-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 02/27/2023] [Accepted: 03/03/2023] [Indexed: 03/21/2023]
Abstract
NET-1 is a key chemotropic ligand that signals commissural axon migration and change in direction. NET-1 and its receptor UNC-5B switch axon growth cones from attraction to repulsion. The biophysical properties of the NET-1 + UNC-5B complex have been poorly characterized. Using multi-wavelength-AUC by adding a fluorophore to UNC-5B, we were able to separate the UNC-5B sedimentation from NET-1. Using both multi-wavelength- and single-wavelength AUC, we investigated NET-1 and UNC-5B hydrodynamic parameters and complex formation. The sedimentation velocity experiments show that NET-1 exists in a monomer-dimer equilibrium. A close study of the association shows that NET-1 forms a pH-sensitive dimer that interacts in an anti-parallel orientation. UNC-5B can form equimolar NET-1 + UNC-5B heterocomplexes with both monomeric and dimeric NET-1.
Collapse
Affiliation(s)
- Haben Gabir
- Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada
| | | | - Markus Meier
- Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada
| | - Fabian Heide
- Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada
| | - Manuel Koch
- Medical Faculty, Institute for Dental Research and Oral Musculoskeletal Biology, University of Cologne, Cologne, Germany
| | - Joerg Stetefeld
- Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada
| | - Borries Demeler
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, AB, Canada.
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT, USA.
| |
Collapse
|
9
|
Bourojeni FB, Zeilhofer HU, Kania A. Netrin-1 receptor DCC is required for the contralateral topography of lamina I anterolateral system neurons. Pain 2021; 162:161-175. [PMID: 32701653 PMCID: PMC7737868 DOI: 10.1097/j.pain.0000000000002012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 07/08/2020] [Accepted: 07/13/2020] [Indexed: 12/30/2022]
Abstract
Anterolateral system (AS) neurons relay nociceptive information from the spinal cord to the brain, protecting the body from harm by evoking a variety of behaviours and autonomic responses. The developmental programs that guide the connectivity of AS neurons remain poorly understood. Spinofugal axons cross the spinal midline in response to Netrin-1 signalling through its receptor deleted in colorectal carcinoma (DCC); however, the relevance of this canonical pathway to AS neuron development has only been demonstrated recently. Here, we disrupted Netrin-1:DCC signalling developmentally in AS neurons and assessed the consequences on the path finding of the different classes of spinofugal neurons. Many lamina I AS neurons normally innervate the lateral parabrachial nucleus and periaqueductal gray on the contralateral side. The loss of DCC in the developing spinal cord resulted in increased frequency of ipsilateral projection of spinoparabrachial and spinoperiaqueductal gray neurons. Given that contralateral spinofugal projections are largely associated with somatotopic representation of the body, changes in the laterality of AS spinofugal projections may contribute to reduced precision in pain localization observed in mice and humans carrying Dcc mutations.
Collapse
Affiliation(s)
- Farin B. Bourojeni
- Research Unit in Neural Circuit Development, Institut de Recherches Cliniques de Montréal (IRCM), Montréal, QC, Canada
- Integrated Program in Neuroscience, McGill University, Montréal, QC, Canada
| | - Hanns Ulrich Zeilhofer
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
- Institute of Pharmaceutical Sciences, Swiss Federal Institute of Technology (ETH) Zurich, Switzerland
| | - Artur Kania
- Research Unit in Neural Circuit Development, Institut de Recherches Cliniques de Montréal (IRCM), Montréal, QC, Canada
- Integrated Program in Neuroscience, McGill University, Montréal, QC, Canada
- Division of Experimental Medicine, Department of Anatomy and Cell Biology, McGill University, Montréal, QC, Canada
| |
Collapse
|
10
|
Bruikman CS, Vreeken D, Zhang H, van Gils MJ, Peter J, van Zonneveld AJ, Hovingh GK, van Gils JM. The identification and function of a Netrin-1 mutation in a pedigree with premature atherosclerosis. Atherosclerosis 2020; 301:84-92. [PMID: 32151395 DOI: 10.1016/j.atherosclerosis.2020.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/24/2019] [Accepted: 02/20/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIMS Neuroimmune guidance cues have been shown to play a role in atherosclerosis, but their exact role in human pathophysiology is largely unknown. In the current study, we investigated the role of a c.1769G > T variant in Netrin-1 in (premature) atherosclerosis. METHODS To determine the effect of the genetic variation, purified Netrin-1, either wild type (wtNetrin-1) or the patient observed variation (mutNetrin-1), was used for migration, adhesion, endothelial barrier function and bindings assays. Expression of adhesion molecules and transcription proteins was analyzed by RT-PCR, Western blot or ELISA. To further delineate how mutNetrin-1 mediates its effect on cell migration, lenti-viral knockdown of UNC5B or DCC was used. RESULTS Bindings assays revealed a decreased binding capacity of mutNetrin-1 to the receptors UNC5B, DCC and β3-integrin and an increased binding capacity to neogenin, heparin and heparan sulfate compared to wtNetrin-1. Exposure of endothelial cells to mutNetrin-1 resulted in enhanced monocyte adhesion and expression of IL-6, CCL2 and ICAM-1 compared to wtNetrin-1. In addition, mutNetrin-1 lacks the inhibitory effect on the NF-κB pathway that is observed for wtNetrin-1. Moreover, the presence of mutNetrin-1 diminished migration of macrophages and smooth muscle cells. Importantly, UNC5B or DCC specific knockdown showed that mutNetrin-1 is unable to act through DCC resulting in enhanced inhibition of migration. CONCLUSIONS Our data demonstrates that mutNetrin-1 fails to exert anti-inflammatory effects on endothelial cells and more strongly blocks macrophage migration compared to wtNetrin-1, suggesting that the carriers of this genetic molecular variant may well be at risk for premature atherosclerosis.
Collapse
Affiliation(s)
- Caroline S Bruikman
- Amsterdam UMC, University of Amsterdam, Department of Vascular Medicine, Amsterdam Cardiovascular Sciences, Meibergdreef 9, Amsterdam, the Netherlands
| | - Dianne Vreeken
- Leiden University Medical Center, Department of Internal Medicine (Nephrology), Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden, the Netherlands
| | - Huayu Zhang
- Leiden University Medical Center, Department of Internal Medicine (Nephrology), Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden, the Netherlands
| | - Marit J van Gils
- Amsterdam UMC, University of Amsterdam, Department of Medical Microbiology, Meibergdreef 9, Amsterdam, the Netherlands
| | - Jorge Peter
- Amsterdam UMC, University of Amsterdam, Department of Experimental Vascular Medicine, Meibergdreef 9, Amsterdam, the Netherlands
| | - Anton Jan van Zonneveld
- Leiden University Medical Center, Department of Internal Medicine (Nephrology), Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden, the Netherlands
| | - G Kees Hovingh
- Amsterdam UMC, University of Amsterdam, Department of Vascular Medicine, Amsterdam Cardiovascular Sciences, Meibergdreef 9, Amsterdam, the Netherlands
| | - Janine M van Gils
- Leiden University Medical Center, Department of Internal Medicine (Nephrology), Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden, the Netherlands.
| |
Collapse
|
11
|
White CC, Yang HS, Yu L, Chibnik LB, Dawe RJ, Yang J, Klein HU, Felsky D, Ramos-Miguel A, Arfanakis K, Honer WG, Sperling RA, Schneider JA, Bennett DA, De Jager PL. Identification of genes associated with dissociation of cognitive performance and neuropathological burden: Multistep analysis of genetic, epigenetic, and transcriptional data. PLoS Med 2017; 14:e1002287. [PMID: 28441426 PMCID: PMC5404753 DOI: 10.1371/journal.pmed.1002287] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 03/17/2017] [Indexed: 12/14/2022] Open
Abstract
INTRODUCTION The molecular underpinnings of the dissociation of cognitive performance and neuropathological burden are poorly understood, and there are currently no known genetic or epigenetic determinants of the dissociation. METHODS AND FINDINGS "Residual cognition" was quantified by regressing out the effects of cerebral pathologies and demographic characteristics on global cognitive performance proximate to death. To identify genes influencing residual cognition, we leveraged neuropathological, genetic, epigenetic, and transcriptional data available for deceased participants of the Religious Orders Study (n = 492) and the Rush Memory and Aging Project (n = 487). Given that our sample size was underpowered to detect genome-wide significance, we applied a multistep approach to identify genes influencing residual cognition, based on our prior observation that independent genetic and epigenetic risk factors can converge on the same locus. In the first step (n = 979), we performed a genome-wide association study with a predefined suggestive p < 10-5, and nine independent loci met this threshold in eight distinct chromosomal regions. Three of the six genes within 100 kb of the lead SNP are expressed in the dorsolateral prefrontal cortex (DLPFC): UNC5C, ENC1, and TMEM106B. In the second step, in the subset of participants with DLPFC DNA methylation data (n = 648), we found that residual cognition was related to differential DNA methylation of UNC5C and ENC1 (false discovery rate < 0.05). In the third step, in the subset of participants with DLPFC RNA sequencing data (n = 469), brain transcription levels of UNC5C and ENC1 were evaluated for their association with residual cognition: RNA levels of both UNC5C (estimated effect = -0.40, 95% CI -0.69 to -0.10, p = 0.0089) and ENC1 (estimated effect = 0.0064, 95% CI 0.0033 to 0.0096, p = 5.7 × 10-5) were associated with residual cognition. In secondary analyses, we explored the mechanism of these associations and found that ENC1 may be related to the previously documented effect of depression on cognitive decline, while UNC5C may alter the composition of presynaptic terminals. Of note, the TMEM106B allele identified in the first step as being associated with better residual cognition is in strong linkage disequilibrium with rs1990622A (r2 = 0.66), a previously identified protective allele for TDP-43 proteinopathy. Limitations include the small sample size for the genetic analysis, which was underpowered to detect genome-wide significance, the evaluation being limited to a single cortical region for epigenetic and transcriptomic data, and the use of categorical measures for certain non-amyloid-plaque, non-neurofibrillary-tangle neuropathologies. CONCLUSIONS Through a multistep analysis of cognitive, neuropathological, genomic, epigenomic, and transcriptomic data, we identified ENC1 and UNC5C as genes with convergent genetic, epigenetic, and transcriptomic evidence supporting a potential role in the dissociation of cognition and neuropathology in an aging population, and we expanded our understanding of the TMEM106B haplotype that is protective against TDP-43 proteinopathy.
Collapse
Affiliation(s)
- Charles C. White
- Program in Translational NeuroPsychiatric Genomics, Institute for the Neurosciences, Departments of Neurology and Psychiatry, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts, United States of America
| | - Hyun-Sik Yang
- Program in Translational NeuroPsychiatric Genomics, Institute for the Neurosciences, Departments of Neurology and Psychiatry, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts, United States of America
- Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Lei Yu
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Lori B. Chibnik
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts, United States of America
- Harvard T.H. Chan School of Public Health, Boston, Massachusetts, United States of America
| | - Robert J. Dawe
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Diagnostic Radiology and Nuclear Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Jingyun Yang
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Hans-Ulrich Klein
- Program in Translational NeuroPsychiatric Genomics, Institute for the Neurosciences, Departments of Neurology and Psychiatry, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Daniel Felsky
- Program in Translational NeuroPsychiatric Genomics, Institute for the Neurosciences, Departments of Neurology and Psychiatry, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Alfredo Ramos-Miguel
- Department of Psychiatry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Konstantinos Arfanakis
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Diagnostic Radiology and Nuclear Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, Illinois, United States of America
| | - William G. Honer
- Department of Psychiatry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Reisa A. Sperling
- Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
| | - Julie A. Schneider
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, United States of America
| | - David A. Bennett
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Philip L. De Jager
- Program in Translational NeuroPsychiatric Genomics, Institute for the Neurosciences, Departments of Neurology and Psychiatry, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
- Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts, United States of America
- Center for Translational & Systems Neuroimmunology, Department of Neurology, Columbia University Medical Center, New York, New York, United States of America
- * E-mail:
| |
Collapse
|
12
|
Prieto CP, Ortiz MC, Villanueva A, Villarroel C, Edwards SS, Elliott M, Lattus J, Aedo S, Meza D, Lois P, Palma V. Netrin-1 acts as a non-canonical angiogenic factor produced by human Wharton's jelly mesenchymal stem cells (WJ-MSC). Stem Cell Res Ther 2017; 8:43. [PMID: 28241866 PMCID: PMC5330133 DOI: 10.1186/s13287-017-0494-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 01/16/2017] [Accepted: 02/08/2017] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Angiogenesis, the process in which new blood vessels are formed from preexisting ones, is highly dependent on the presence of classical angiogenic factors. Recent evidence suggests that axonal guidance proteins and their receptors can also act as angiogenic regulators. Netrin, a family of laminin-like proteins, specifically Netrin-1 and 4, act via DCC/Neogenin-1 and UNC5 class of receptors to promote or inhibit angiogenesis, depending on the physiological context. METHODS Mesenchymal stem cells secrete a broad set of classical angiogenic factors. However, little is known about the expression of non-canonical angiogenic factors such as Netrin-1. The aim was to characterize the possible secretion of Netrin ligands by Wharton's jelly-derived mesenchymal stem cells (WJ-MSC). We evaluated if Netrin-1 presence in the conditioned media from these cells was capable of inducing angiogenesis both in vitro and in vivo, using human umbilical vein endothelial cells (HUVEC) and chicken chorioallantoic membrane (CAM), respectively. In addition, we investigated if the RhoA/ROCK pathway is responsible for the integration of Netrin signaling to control vessel formation. RESULTS The paracrine angiogenic effect of the WJ-MSC-conditioned media is mediated at least in part by Netrin-1 given that pharmacological blockage of Netrin-1 in WJ-MSC resulted in diminished angiogenesis on HUVEC. When HUVEC were stimulated with exogenous Netrin-1 assayed at physiological concentrations (10-200 ng/mL), endothelial vascular migration occurred in a concentration-dependent manner. In line with our determination of Netrin-1 present in WJ-MSC-conditioned media we were able to obtain endothelial tubule formation even in the pg/mL range. Through CAM assays we validated that WJ-MSC-secreted Netrin-1 promotes an increased angiogenesis in vivo. Netrin-1, secreted by WJ-MSC, might mediate its angiogenic effect through specific cell surface receptors on the endothelium, such as UNC5b and/or integrin α6β1, expressed in HUVEC. However, the angiogenic response of Netrin-1 seems not to be mediated through the RhoA/ROCK pathway. CONCLUSIONS Thus, here we show that stromal production of Netrin-1 is a critical component of the vascular regulatory machinery. This signaling event may have deep implications in the modulation of several processes related to a number of diseases where angiogenesis plays a key role in vascular homeostasis.
Collapse
Affiliation(s)
- Catalina P. Prieto
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - María Carolina Ortiz
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - Andrea Villanueva
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - Cynthia Villarroel
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - Sandra S. Edwards
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - Matías Elliott
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - José Lattus
- Campus Oriente, Department of Obstetrics and Gynecology, Faculty of Medicine, University of Chile, Santiago de Chile, Chile
| | - Sócrates Aedo
- Campus Oriente, Department of Obstetrics and Gynecology, Faculty of Medicine, University of Chile, Santiago de Chile, Chile
| | - Daniel Meza
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - Pablo Lois
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| | - Verónica Palma
- Laboratory of Stem Cells and Developmental Biology, Faculty of Sciences, University of Chile, Santiago de Chile, Chile
| |
Collapse
|
13
|
Gopal AA, Rappaz B, Rouger V, Martyn IB, Dahlberg PD, Meland RJ, Beamish IV, Kennedy TE, Wiseman PW. Netrin-1-Regulated Distribution of UNC5B and DCC in Live Cells Revealed by TICCS. Biophys J 2017; 110:623-634. [PMID: 26840727 DOI: 10.1016/j.bpj.2015.12.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 12/16/2015] [Accepted: 12/21/2015] [Indexed: 01/01/2023] Open
Abstract
Netrins are secreted proteins that direct cell migration and adhesion during development. Netrin-1 binds its receptors deleted in colorectal cancer (DCC) and the UNC5 homologs (UNC5A-D) to activate downstream signaling that ultimately directs cytoskeletal reorganization. To investigate how netrin-1 regulates the dynamic distribution of DCC and UNC5 homologs, we applied fluorescence confocal and total internal reflection fluorescence microscopy, and sliding window temporal image cross correlation spectroscopy, to measure time profiles of the plasma membrane distribution, aggregation state, and interaction fractions of fluorescently tagged netrin receptors expressed in HEK293T cells. Our measurements reveal changes in receptor aggregation that are consistent with netrin-1-induced recruitment of DCC-enhanced green fluorescent protein (EGFP) from intracellular vesicles to the plasma membrane. Netrin-1 also induced colocalization of coexpressed full-length DCC-EGFP with DCC-T-mCherry, a putative DCC dominant negative that replaces the DCC intracellular domain with mCherry, consistent with netrin-1-induced receptor oligomerization, but with no change in aggregation state with time, providing evidence that signaling via the DCC intracellular domain triggers DCC recruitment to the plasma membrane. UNC5B expressed alone was also recruited by netrin-1 to the plasma membrane. Coexpressed DCC and UNC5 homologs are proposed to form a heteromeric netrin-receptor complex to mediate a chemorepellent response. Application of temporal image cross correlation spectroscopy to image series of cells coexpressing UNC5B-mCherry and DCC-EGFP revealed a netrin-1-induced increase in colocalization, with both receptors recruited to the plasma membrane from preexisting clusters, consistent with vesicular recruitment and receptor heterooligomerization. Plasma membrane recruitment of DCC or UNC5B was blocked by application of the netrin-1 VI-V peptide, which fails to activate chemoattraction, or by pharmacological block of Src family kinase signaling, consistent with receptor recruitment requiring netrin-1-activated signaling. Our findings reveal a mechanism activated by netrin-1 that recruits DCC and UNC5B to the plasma membrane.
Collapse
Affiliation(s)
- Angelica A Gopal
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Benjamin Rappaz
- McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Vincent Rouger
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Iain B Martyn
- Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Peter D Dahlberg
- Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Rachel J Meland
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Ian V Beamish
- McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Timothy E Kennedy
- McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Paul W Wiseman
- Department of Chemistry, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; McGill Program in Neuroengineering, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Physics, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.
| |
Collapse
|
14
|
Raza Q, Jacobs JR. Guidance signalling regulates leading edge behaviour during collective cell migration of cardiac cells in Drosophila. Dev Biol 2016; 419:285-297. [PMID: 27618756 DOI: 10.1016/j.ydbio.2016.09.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 09/04/2016] [Accepted: 09/05/2016] [Indexed: 01/31/2023]
Abstract
Collective cell migration is the coordinated movement of cells, which organize tissues during morphogenesis, repair and some cancers. The motile cell membrane of the advancing front in collective cell migration is termed the Leading Edge. The embryonic development of the vertebrate and Drosophila hearts are both characterized by the coordinated medial migration of a bilateral cluster of mesodermal cells. In Drosophila, the cardioblasts form cohesive bilateral rows that migrate collectively as a unit towards the dorsal midline to form the dorsal vessel. We have characterized the collective cell migration of cardioblasts as an in vivo quantitative model to study the behaviour of the Leading Edge. We investigated whether guidance signalling through Slit and Netrin pathways plays a role in cell migration during heart development. Through time-lapse imaging and quantitative assessment of migratory behaviour of the cardioblasts in loss-of-function mutants, we demonstrate that both Slit and Netrin mediated signals are autonomously and concomitantly required to maximize migration velocity, filopodial and lamellipodial activities. Additionally, we show that another Slit and Netrin receptor, Dscam1, the role of which during heart development was previously unknown, is required for both normal migration of cardioblasts and luminal expansion. Leading edge behaviour analysis revealed a dosage dependent genetic interaction between Slit and Netrin receptors suggesting that downstream signalling through these receptors converge on a common output that increases leading edge activity of the cardioblasts. Finally, we found that guidance signalling maintains the balance between epithelial and mesenchymal characteristics of the migrating cardioblasts.
Collapse
Affiliation(s)
- Qanber Raza
- Department of Biology, McMaster University, 1280 Main St W, Hamilton, ON, Canada L8S 4L8
| | - J Roger Jacobs
- Department of Biology, McMaster University, 1280 Main St W, Hamilton, ON, Canada L8S 4L8.
| |
Collapse
|
15
|
Ridge PG, Hoyt KB, Boehme K, Mukherjee S, Crane PK, Haines JL, Mayeux R, Farrer LA, Pericak-Vance MA, Schellenberg GD, Kauwe JSK. Assessment of the genetic variance of late-onset Alzheimer's disease. Neurobiol Aging 2016; 41:200.e13-200.e20. [PMID: 27036079 PMCID: PMC4948179 DOI: 10.1016/j.neurobiolaging.2016.02.024] [Citation(s) in RCA: 151] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/27/2016] [Accepted: 02/20/2016] [Indexed: 11/21/2022]
Abstract
Alzheimer's disease (AD) is a complex genetic disorder with no effective treatments. More than 20 common markers have been identified, which are associated with AD. Recently, several rare variants have been identified in Amyloid Precursor Protein (APP), Triggering Receptor Expressed On Myeloid Cells 2 (TREM2) and Unc-5 Netrin Receptor C (UNC5C) that affect risk for AD. Despite the many successes, the genetic architecture of AD remains unsolved. We used Genome-wide Complex Trait Analysis to (1) estimate phenotypic variance explained by genetics; (2) calculate genetic variance explained by known AD single nucleotide polymorphisms (SNPs); and (3) identify the genomic locations of variation that explain the remaining unexplained genetic variance. In total, 53.24% of phenotypic variance is explained by genetics, but known AD SNPs only explain 30.62% of the genetic variance. Of the unexplained genetic variance, approximately 41% is explained by unknown SNPs in regions adjacent to known AD SNPs, and the remaining unexplained genetic variance outside these regions.
Collapse
Affiliation(s)
- Perry G Ridge
- Department of Biology, Brigham Young University, Provo, UT, USA
| | - Kaitlyn B Hoyt
- Department of Biology, Brigham Young University, Provo, UT, USA
| | - Kevin Boehme
- Department of Biology, Brigham Young University, Provo, UT, USA
| | | | - Paul K Crane
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Jonathan L Haines
- Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, OH, USA
| | - Richard Mayeux
- Department of Neurology and the Taub Institute on Alzheimer's Disease and the Aging Brain, Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA
| | - Lindsay A Farrer
- Department of Biostatistics, Boston University, Boston, MA, USA; Department of Epidemiology, Boston University, Boston, MA, USA; Department of Medicine (Genetics Program), Boston University, Boston, MA, USA; Department of Neurology, Boston University, Boston, MA, USA; Department of Ophthalmology, Boston University, Boston, MA, USA
| | - Margaret A Pericak-Vance
- Dr. John T. Macdonald Foundation Department of Human Genetics, and The John P. Hussman Institute for Human Genomics, University of Miami, Miami, FL, USA
| | - Gerard D Schellenberg
- Department of Pathology and Laboratory Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - John S K Kauwe
- Department of Biology, Brigham Young University, Provo, UT, USA.
| |
Collapse
|
16
|
Grandin M, Meier M, Delcros JG, Nikodemus D, Reuten R, Patel TR, Goldschneider D, Orriss G, Krahn N, Boussouar A, Abes R, Dean Y, Neves D, Bernet A, Depil S, Schneiders F, Poole K, Dante R, Koch M, Mehlen P, Stetefeld J. Structural Decoding of the Netrin-1/UNC5 Interaction and its Therapeutical Implications in Cancers. Cancer Cell 2016; 29:173-85. [PMID: 26859457 DOI: 10.1016/j.ccell.2016.01.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 09/02/2015] [Accepted: 01/05/2016] [Indexed: 12/17/2022]
Abstract
Netrin-1 has been shown to be up-regulated in a fraction of human cancers as a mechanism to allow these tumors to escape the pro-apoptotic activity of some of its main dependence receptors, the UNC5 homologs (UNC5H). Here we identify the V-2 domain of netrin-1 to be important for its interaction with the Ig1/Ig2 domains of UNC5H2. We generate a humanized anti-netrin-1 antibody that disrupts the interaction between netrin-1 and UNC5H2 and triggers death of netrin-1-expressing tumor cells in vitro. We also present evidence that combining the anti-netrin-1 antibody with epidrugs such as decitabine could be effective in treating tumors showing no or modest netrin-1 expression. These results support that this antibody is a promising drug candidate.
Collapse
Affiliation(s)
- Mélodie Grandin
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France
| | - Markus Meier
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, MB RT3 2N2, Canada
| | - Jean Guy Delcros
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France
| | - Denise Nikodemus
- Center for Biochemistry, Institute for Dental Research and Oral Musculoskeletal Research, University of Cologne, 50931 Cologne, Germany; Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Lisbon 1749-016, Portugal
| | - Raphael Reuten
- Center for Biochemistry, Institute for Dental Research and Oral Musculoskeletal Research, University of Cologne, 50931 Cologne, Germany
| | - Trushar R Patel
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, MB RT3 2N2, Canada; Department of Microbiology, University of Manitoba, 144 Dysart Road, Winnipeg, MB RT3 2N2, Canada
| | - David Goldschneider
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France; Netris Pharma, Centre Léon Bérard, 69008 Lyon, France
| | - George Orriss
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, MB RT3 2N2, Canada
| | - Natalie Krahn
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, MB RT3 2N2, Canada
| | - Amina Boussouar
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France
| | - Riad Abes
- Netris Pharma, Centre Léon Bérard, 69008 Lyon, France
| | - Yann Dean
- Netris Pharma, Centre Léon Bérard, 69008 Lyon, France
| | - David Neves
- Netris Pharma, Centre Léon Bérard, 69008 Lyon, France
| | - Agnes Bernet
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France; Netris Pharma, Centre Léon Bérard, 69008 Lyon, France
| | | | - Fiona Schneiders
- Center for Biochemistry, Institute for Dental Research and Oral Musculoskeletal Research, University of Cologne, 50931 Cologne, Germany
| | - Kate Poole
- Department of Neuroscience, Max-Delbrück Center for Molecular Medicine, Robert-Rössle Straβe 10, Berlin 13092, Germany
| | - Robert Dante
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France
| | - Manuel Koch
- Center for Biochemistry, Institute for Dental Research and Oral Musculoskeletal Research, University of Cologne, 50931 Cologne, Germany; Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Lisbon 1749-016, Portugal
| | - Patrick Mehlen
- Apoptosis, Cancer and Development Laboratory, Equipe labellisée 'La Ligue', LabEx DEVweCAN, Centre de Recherche en Cancérologie de Lyon, INSERM U1052-CNRS UMR5286, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France.
| | - Jörg Stetefeld
- Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, MB RT3 2N2, Canada.
| |
Collapse
|
17
|
Visser JJ, Cheng Y, Perry SC, Chastain AB, Parsa B, Masri SS, Ray TA, Kay JN, Wojtowicz WM. An extracellular biochemical screen reveals that FLRTs and Unc5s mediate neuronal subtype recognition in the retina. eLife 2015; 4:e08149. [PMID: 26633812 PMCID: PMC4737655 DOI: 10.7554/elife.08149] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 12/01/2015] [Indexed: 12/25/2022] Open
Abstract
In the inner plexiform layer (IPL) of the mouse retina, ~70 neuronal subtypes organize their neurites into an intricate laminar structure that underlies visual processing. To find recognition proteins involved in lamination, we utilized microarray data from 13 subtypes to identify differentially-expressed extracellular proteins and performed a high-throughput biochemical screen. We identified ~50 previously-unknown receptor-ligand pairs, including new interactions among members of the FLRT and Unc5 families. These proteins show laminar-restricted IPL localization and induce attraction and/or repulsion of retinal neurites in culture, placing them in an ideal position to mediate laminar targeting. Consistent with a repulsive role in arbor lamination, we observed complementary expression patterns for one interaction pair, FLRT2-Unc5C, in vivo. Starburst amacrine cells and their synaptic partners, ON-OFF direction-selective ganglion cells, express FLRT2 and are repelled by Unc5C. These data suggest a single molecular mechanism may have been co-opted by synaptic partners to ensure joint laminar restriction.
Collapse
Affiliation(s)
- Jasper J Visser
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| | - Yolanda Cheng
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| | - Steven C Perry
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| | - Andrew Benjamin Chastain
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| | - Bayan Parsa
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| | - Shatha S Masri
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| | - Thomas A Ray
- Department of Neurobiology, Duke University School of Medicine, Durham, United States
- Department of Opthalmology, Duke University School of Medicine, Durham, United States
| | - Jeremy N Kay
- Department of Neurobiology, Duke University School of Medicine, Durham, United States
- Department of Opthalmology, Duke University School of Medicine, Durham, United States
| | - Woj M Wojtowicz
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
| |
Collapse
|
18
|
Zuo Y, Yang J, He Y, Zhao Y. [Preparation of a uncoordinated-5 homolog B monoclonal antibody and its effect on melanoma cell migration in vitro]. Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi 2015; 31:1259-1262. [PMID: 26359108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To prepare and characterize the monoclonal antibody (mAb) against uncoordinated-5 homolog B (UNC5B) and analyze its effect on the migration of melanoma cells. METHODS UNC5B gene fragment was cloned into the prokaryotic expression vector pET-32a. The recombinant UNC5B protein was expressed in E.coli BL21 (DE3) and purified by affinity chromatography. BALB/c mice were immunized with the recombinant protein and the hybridoma cell clones stably secreting UNC5B antibody were screened by traditional hybridoma technique. ELISA, Western blotting and flow cytometry were used to characterize the specificity of the antibodies. In addition, the effect of the mAb on melanoma cell migration was analyzed by wound healing assay. RESULTS The recombinant UNC5B protein was expressed and purified. One high-titer antibody 2C9 was obtained. ELISA, Western blotting and flow cytometry all demonstrated that 2C9 antibody specifically recognized the UNC5B protein. Wound healing assay indicated that the UNC5B mAb could promote melanoma cell migration at the presence of netrin-1. CONCLUSION A UNC5B-specific monoclonal antibody was prepared and proved to have the ability of promoting melanoma cell migration at the presence of netrin-1.
Collapse
Affiliation(s)
- Yuanling Zuo
- Jiangsu Institute of Hematology, First Affiliated Hospital, Soochow University, Ministry of Health Key Laboratory of Thrombosis and Hemostasis, Suzhou 215006; Cyrus Tang Hematology Center, Soochow University, Suzhou 215123, China
| | - Jianfeng Yang
- Cyrus Tang Hematology Center, Soochow University, Suzhou 215123, China
| | - Yang He
- Jiangsu Institute of Hematology, First Affiliated Hospital, Soochow University, Ministry of Health Key Laboratory of Thrombosis and Hemostasis, Suzhou 215006; Cyrus Tang Hematology Center, Soochow University, Suzhou 215123, China
| | - Yiming Zhao
- Jiangsu Institute of Hematology, First Affiliated Hospital, Soochow University, Ministry of Health Key Laboratory of Thrombosis and Hemostasis, Suzhou 215006, China
| |
Collapse
|
19
|
Abstract
Understanding how axons are guided to target locations within the brain is of fundamental importance for neuroscience, and is a widely studied area of research. Biologists have an unmet need for reliable and easily accessible methods that generate stable, soluble molecular gradients for the investigation of axon guidance. Here we developed a microfluidic device with contiguous media-filled compartments that uses gravity-driven flow to generate a stable and highly reproducible gradient within a viewing compartment only accessible to axons. This device uses high-resistance microgrooves to both direct the growth of axons into an isolated region and to generate a stable gradient within the fluidically isolated axon viewing compartment for over 22 h. Establishing a stable gradient relies on a simple and quick pipetting procedure with no external pump or tubing. Since the axons extend into the axonal compartment through aligned microgrooves, the analysis of turning is simplified. Further, the multiple microgrooves in parallel alignment serve to increase sample sizes, improving statistical analyses. We used this method to examine growth cone turning in response to the secreted axon guidance cue netrin-1. We report the novel finding that growth cones of embryonic mouse cortical axons exhibited attractive turning in the lower concentrations of netrin-1, but were repulsed when exposed to higher concentrations. We also performed immunocytochemistry in growth cones exposed to a netrin-1 gradient within the axon viewing compartment and show that netrin receptors associated with both attraction and repulsion, DCC and UNC5H, localized to these growth cones. Together, we developed an accessible gradient chamber for higher throughput axon guidance studies and demonstrated its capabilities.
Collapse
Affiliation(s)
- A. M. Taylor
- UNC/NCSU Joint Department of Biomedical Engineering, UNC-Chapel Hill, Campus Box 7575, Chapel Hill NC 27599-7575, USA
- UNC Neuroscience Center, USA
- Carolina Institute for Developmental Disabilities, USA
| | - S. Menon
- UNC Department of Cell Biology and Physiology, UNC-Chapel Hill, Campus Box 7545, Chapel Hill, NC 27599-7545, USA
| | - S. L. Gupton
- UNC Department of Cell Biology and Physiology, UNC-Chapel Hill, Campus Box 7545, Chapel Hill, NC 27599-7545, USA
- UNC Neuroscience Center, USA
- UNC Lineberger Comprehensive Cancer Center, USA
| |
Collapse
|
20
|
Ranganathan P, Mohamed R, Jayakumar C, Brands MW, Ramesh G. Deletion of UNC5B in Kidney Epithelium Exacerbates Diabetic Nephropathy in Mice. Am J Nephrol 2015; 41:220-30. [PMID: 25896231 DOI: 10.1159/000381428] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/03/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND Guidance cue netrin-1 was shown to have protective effects in diabetic nephropathy. However, the role of its receptor UNC5B in diabetic kidney disease is unknown. Moreover, whether netrin-1 is protective against diabetic kidney disease in a genetic model of nephropathy and in the nephropathy prone DBA background is also unknown. The aim of this study was to determine the significance of UNC5B in tubular epithelial cells in chronic kidney disease due to diabetes and evaluate whether netrin-1 is also protective in the case of a nephropathy-prone mouse. METHODS Proximal tubular epithelium-specific UNC5B knockout mice as well as heterozygous UNC5B knockout mice were used to determine the roles of UNC5B in nephropathy. Diabetes was induced in these tissue-specific knockout, heterozygous and WT mice, and albuminuria was then monitored. RESULTS WT and heterozygous diabetic mice developed significant albuminuria at 8 weeks after induction of diabetes as compared to buffer-treated control mice. However, albuminuria was significantly more pronounced in mice with proximal tubule specific deletion of UNC5B. Transgenic overexpression of netrin-1 in proximal tubules in the DBA background and administration of recombinant netrin-1 to Ins2Akita mice also significantly reduced diabetes-induced albuminuria and suppressed glomerular and interstitial lesions. CONCLUSION Our data suggested that netrin-1 signaling in proximal tubular epithelium may play a critical role in the protection of kidney against diabetic kidney disease.
Collapse
Affiliation(s)
- Punithavathi Ranganathan
- Department of Medicine and Vascular Biology Center, Georgia Regents University, Augusta, Ga., USA
| | | | | | | | | |
Collapse
|
21
|
Yamagishi S. [FLRT family proteins act as repulsive guidance cues for Unc5-positive neurons]. Seikagaku 2014; 86:493-497. [PMID: 25255634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
|
22
|
Huang F, Ben Aissa M, Magron A, Huard CC, Godin C, Lévesque G, Carreau M. The Fanconi anemia group C protein interacts with uncoordinated 5A and delays apoptosis. PLoS One 2014; 9:e92811. [PMID: 24676280 PMCID: PMC3968024 DOI: 10.1371/journal.pone.0092811] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 02/25/2014] [Indexed: 11/19/2022] Open
Abstract
The Fanconi anemia group C protein (FANCC) is one of the several proteins that comprise the Fanconi anemia (FA) network involved in genomic surveillance. FANCC is mainly cytoplasmic and has many functions, including apoptosis suppression through caspase-mediated proteolytic processing. Here, we examined the role of FANCC proteolytic fragments by identifying their binding partners. We performed a yeast two-hybrid screen with caspase-mediated FANCC cleavage products and identified the dependence receptor uncoordinated-5A (UNC5A) protein. Here, we show that FANCC physically interacts with UNC5A, a pro-apoptotic dependence receptor. FANCC interaction occurs through the UNC5A intracellular domain, specifically via its death domain. FANCC modulates cell sensitivity to UNC5A-mediated apoptosis; we observed reduced UNC5A-mediated apoptosis in the presence of FANCC and increased apoptosis in FANCC-depleted cells. Our results show that FANCC interferes with UNC5A's functions in apoptosis and suggest that FANCC may participate in developmental processes through association with the dependence receptor UNC5A.
Collapse
Affiliation(s)
- FengFei Huang
- Department of Pediatrics, Centre Hospitalier Universitaire de Québec, Québec, Québec, Canada
| | - Manel Ben Aissa
- Department of Pediatrics, Centre Hospitalier Universitaire de Québec, Québec, Québec, Canada
| | - Audrey Magron
- Department of Pediatrics, Centre Hospitalier Universitaire de Québec, Québec, Québec, Canada
| | - Caroline C. Huard
- Department of Pediatrics, Centre Hospitalier Universitaire de Québec, Québec, Québec, Canada
| | - Chantal Godin
- Department of Psychiatry and Neurosciences, Université Laval, Cité Universitaire, Québec, Canada
| | - Georges Lévesque
- Department of Psychiatry and Neurosciences, Université Laval, Cité Universitaire, Québec, Canada
| | - Madeleine Carreau
- Department of Pediatrics, Centre Hospitalier Universitaire de Québec, Québec, Québec, Canada
- * E-mail:
| |
Collapse
|
23
|
Küry S, Garrec C, Airaud F, Breheret F, Guibert V, Frenard C, Jiao S, Bonneau D, Berthet P, Bossard C, Ingster O, Cauchin E, Bezieau S. Evaluation of the colorectal cancer risk conferred by rare UNC5C alleles. World J Gastroenterol 2014; 20:204-213. [PMID: 24415873 PMCID: PMC3886009 DOI: 10.3748/wjg.v20.i1.204] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 08/07/2013] [Accepted: 09/17/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate the risk associated with variants of the UNC5C gene recently suspected to predispose to familial colorectal cancer (CRC).
METHODS: We screened patients with familial CRC forms as well as patients with sporadic CRCs. In a first time, we analyzed exon 11 of the UNC5C gene in 120 unrelated patients with suspected hereditary CRC, 58 patients with suspected Lynch-associated cancer or polyposis, and 132 index cases of Lynch syndrome families with a characterized mutation in a DNA mismatch repair (MMR). Next, 1023 patients with sporadic CRC and 1121 healthy individuals were screened for the variants identified in patients with familial cancer.
RESULTS: Of 120 patients with familial CRC of unknown etiology, one carried the previously reported mis-sense mutation p.Arg603Cys (R603C) and another exhibited the unreported variant of unknown significance p.Thr617Ile (T617I). The p.Ala628Lys (A628K) mutation previously described as the main UNC5C risk variant for familial CRC was not detected in any cases of familial CRC of unknown etiology, but was present in a patient with familial gastric cancer and in two Lynch syndrome patients in co-occurrence with MMR mutations. A statistically non-significant increase in cancer risk was identified in familial CRC and/or other Lynch-associated cancers (1/178 patients vs 2/1121 healthy controls, OR = 3.2, 95%CI: 0.29-35.05, P = 0.348) and in sporadic CRCs (4/1023 patients vs 2/1121 healthy controls, OR = 2.2, 95%CI: 0.40-12.02, P = 0.364).
CONCLUSION: We confirm that UNC5C mutations are very rare in familial and sporadic CRCs, but further investigations are needed to justify routine UNC5C testing for diagnostic purposes.
Collapse
|
24
|
Liu J, Kong CZ. [Expressions of netrin-1 and UNC5B in prostate cancer and their clinical significance]. Zhonghua Nan Ke Xue 2013; 19:1072-1076. [PMID: 24432616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To search for a new diagnostic biomarker for prostate cancer by comparing the differences in the expressions of netrin-1 and UNC5B in prostate cancer cells with different invasive abilities. METHODS We examined the expressions of netrin-1 and UNC5B in five prostate cancer cell lines DU145, 22RV1, PC3, PC3M and RWPE-1 using RT-PCR and Western blot, and positioned the ligands netrin-1 and its receptor UNC5B in the prostate cancer cells by immunofluorescence. RESULTS Both netrin-1 and UNC5B were expressed in the prostate cancer cells, and the expression of netrin-1 was significantly increased in highly invasive cells (P < 0.05), while that of UNC5B in RWPE-1 (normal) cells (P < 0.05). CONCLUSION The expressions of netrin-1 and UNC5B are closely related to the infiltration and progression of prostate cancer, and expected to be as potential biomarkers for predicting the malignancy degree of prostate cancer.
Collapse
Affiliation(s)
- Jiao Liu
- Department of Urology, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning 110001, China
| | - Chui-Ze Kong
- Department of Urology, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning 110001, China
| |
Collapse
|
25
|
Duff G, Argaw A, Cecyre B, Cherif H, Tea N, Zabouri N, Casanova C, Ptito M, Bouchard JF. Cannabinoid receptor CB2 modulates axon guidance. PLoS One 2013; 8:e70849. [PMID: 23951024 PMCID: PMC3739758 DOI: 10.1371/journal.pone.0070849] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 06/28/2013] [Indexed: 01/29/2023] Open
Abstract
Navigation of retinal projections towards their targets is regulated by guidance molecules and growth cone transduction mechanisms. Here, we present in vitro and in vivo evidences that the cannabinoid receptor 2 (CB2R) is expressed along the retino-thalamic pathway and exerts a modulatory action on axon guidance. These effects are specific to CB2R since no changes were observed in mice where the gene coding for this receptor was altered (cnr2 (-/-)). The CB2R induced morphological changes observed at the growth cone are PKA dependent and require the presence of the netrin-1 receptor, Deleted in Colorectal Cancer. Interfering with endogenous CB2R signalling using pharmacological agents increased retinal axon length and induced aberrant projections. Additionally, cnr2 (-/-) mice showed abnormal eye-specific segregation of retinal projections in the dorsal lateral geniculate nucleus (dLGN) indicating CB2R's implication in retinothalamic development. Overall, this study demonstrates that the contribution of endocannabinoids to brain development is not solely mediated by CB1R, but also involves CB2R.
Collapse
MESH Headings
- Animals
- Axons/metabolism
- Axons/ultrastructure
- Cyclic AMP-Dependent Protein Kinases/genetics
- Cyclic AMP-Dependent Protein Kinases/metabolism
- Embryo, Mammalian
- Endocannabinoids/metabolism
- Gene Expression Regulation, Developmental
- Geniculate Bodies/cytology
- Geniculate Bodies/growth & development
- Geniculate Bodies/metabolism
- Mice
- Mice, Knockout
- Netrin Receptors
- Neurogenesis/physiology
- Primary Cell Culture
- Receptor, Cannabinoid, CB1/genetics
- Receptor, Cannabinoid, CB1/metabolism
- Receptor, Cannabinoid, CB2/deficiency
- Receptor, Cannabinoid, CB2/genetics
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Retinal Ganglion Cells/cytology
- Retinal Ganglion Cells/metabolism
- Visual Pathways/physiology
Collapse
Affiliation(s)
- Gabriel Duff
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
- Faculty of Pharmacy, University of Montreal, Montreal, Quebec, Canada
| | - Anteneh Argaw
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
- Department of Biomedical Science, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada
| | - Bruno Cecyre
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
| | - Hosni Cherif
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
| | - Nicolas Tea
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
| | - Nawal Zabouri
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
| | | | - Maurice Ptito
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
| | - Jean-François Bouchard
- School of Optometry, University of Montreal, Montreal, Quebec, Canada
- Faculty of Pharmacy, University of Montreal, Montreal, Quebec, Canada
- * E-mail:
| |
Collapse
|
26
|
Low VF, Fiorini Z, Fisher L, Jasoni CL. Netrin-1 stimulates developing GnRH neurons to extend neurites to the median eminence in a calcium- dependent manner. PLoS One 2012; 7:e46999. [PMID: 23056554 PMCID: PMC3467286 DOI: 10.1371/journal.pone.0046999] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 09/11/2012] [Indexed: 11/23/2022] Open
Abstract
Hypothalamic gonadotropin-releasing hormone (GnRH) neurons are required for fertility in all mammalian species studied to date. In rodents, GnRH neuron cell bodies reside in the rostral hypothalamus, and most extend a single long neuronal process in the caudal direction to terminate at the median eminence (ME), the site of hormone secretion. The molecular cues that GnRH neurites use to grow and navigate to the ME during development, however, remain poorly described. Reverse transcription-PCR (RT-PCR) identified mRNAs encoding Netrin-1, and its receptor, DCC, in the fetal preoptic area (POA) and mediobasal hypothalamus (MBH), respectively, from gestational day 12.5 (GD12.5), a time when the first GnRH neurites extend toward the MBH. Moreover, a subpopulation of GnRH neurons from GD14.5 through GD18.5 express the Netrin-1 receptor, DCC, suggesting a role for Netrin-1/DCC signaling in GnRH neurite growth and/or guidance. In support of this notion, when GD15.5 POA explants, containing GnRH neurons actively extending neurites, were grown in three-dimensional collagen gels and challenged with exogenous Netrin-1 (100 ng/ml or 400 ng/ml) GnRH neurite growth was stimulated. In addition, Netrin-1 provided from a fixed source was able to stimulate outgrowth, although it did not appear to chemoattract GnRH neurites. Finally, the effects of Netrin-1 on the outgrowth of GnRH neurites could be inhibited by blocking either L-type voltage-gated calcium channels (VGCCs) with nifedipine (10 µM), or ryanodine receptors with ryanodine (10 µM). This is consistent with the role of Ca2+ from extra- and intracellular sources in Netrin-1/DCC-dependent growth cone motility in other neurons. These results indicate that Netrin-1 directly stimulates the growth of a subpopulation of GnRH neurites that express DCC, provide further understanding of the mechanisms by which GnRH nerve terminals arrive at their site of hormone secretion, and identify an additional neuronal population whose neurites utilize Netrin-1/DCC signaling for their development.
Collapse
Affiliation(s)
- Victoria F. Low
- Centre for Neuroendocrinology, Department of Anatomy, University of Otago, School of Medical Sciences, Dunedin, New Zealand
| | - Zeno Fiorini
- Centre for Neuroendocrinology, Department of Anatomy, University of Otago, School of Medical Sciences, Dunedin, New Zealand
| | - Lorryn Fisher
- Centre for Neuroendocrinology, Department of Anatomy, University of Otago, School of Medical Sciences, Dunedin, New Zealand
| | - Christine L. Jasoni
- Centre for Neuroendocrinology, Department of Anatomy, University of Otago, School of Medical Sciences, Dunedin, New Zealand
- * E-mail:
| |
Collapse
|
27
|
König K, Köhler D, Granja T, Jennewein C, Tran N, Mirakaj V, Kröhnert F, Rosenberger P. The uncoordinated-5 homolog B receptor affects hepatic ischemia reperfusion injury. PLoS One 2012; 7:e41085. [PMID: 22848430 PMCID: PMC3405071 DOI: 10.1371/journal.pone.0041085] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 06/17/2012] [Indexed: 11/18/2022] Open
Abstract
Recent evidence has demonstrated additional roles for the neuronal guidance protein receptor UNC5B outside the nervous system. Given the fact that ischemia reperfusion injury (IRI) of the liver is a common source of liver dysfunction and the role of UNC5B during an acute inflammatory response we investigated the role of UNC5B on acute hepatic IRI. We report here that UNC5B(+/-) mice display reduced hepatic IRI and neutrophil (PMN) infiltration compared to WT controls. This correlated with serum levels of lactate dehydrogenase (LDH), aspartate- (AST) and alanine- (ALT) aminotransferase, the presence of PMN within ischemic hepatic tissue, and serum levels of inflammatory cytokines. Moreover, injection of an anti-UNC5B antibody resulted in a significant reduction of hepatic IR injury. This was associated with reduced parameters of liver injury (LDH, ALT, AST) and accumulation of PMN within the injured hepatic tissue. In conclusion our studies demonstrate a significant role for UNC5B in the development of hepatic IRI and identified UNC5B as a potential drug target to prevent liver dysfunction in the future.
Collapse
Affiliation(s)
- Klemens König
- Department of Anaesthesiology and Intensive Care Medicine, Tübingen University Hospital, Eberhard-Karls University Tübingen, Tübingen, Germany
- Clinic of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt am Main, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - David Köhler
- Department of Anaesthesiology and Intensive Care Medicine, Tübingen University Hospital, Eberhard-Karls University Tübingen, Tübingen, Germany
| | - Tiago Granja
- Department of Anaesthesiology and Intensive Care Medicine, Tübingen University Hospital, Eberhard-Karls University Tübingen, Tübingen, Germany
- Clinic of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt am Main, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Carla Jennewein
- Clinic of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt am Main, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Nguyen Tran
- Clinic of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt am Main, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Valbona Mirakaj
- Department of Anaesthesiology and Intensive Care Medicine, Tübingen University Hospital, Eberhard-Karls University Tübingen, Tübingen, Germany
- Department of Anaesthesiology, Perioperative, and Pain Medicine, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital Harvard Medical School, Boston, Massachusetts, United States of America
| | - Friedemann Kröhnert
- Department of Anaesthesiology and Intensive Care Medicine, Tübingen University Hospital, Eberhard-Karls University Tübingen, Tübingen, Germany
| | - Peter Rosenberger
- Department of Anaesthesiology and Intensive Care Medicine, Tübingen University Hospital, Eberhard-Karls University Tübingen, Tübingen, Germany
- * E-mail:
| |
Collapse
|
28
|
Affiliation(s)
- Robert E Gerszten
- Massachusetts General Hospital and Harvard Medical School, Boston, USA
| | | |
Collapse
|
29
|
Hale LA, Fowler DK, Eisen JS. Netrin signaling breaks the equivalence between two identified zebrafish motoneurons revealing a new role of intermediate targets. PLoS One 2011; 6:e25841. [PMID: 22003409 PMCID: PMC3189217 DOI: 10.1371/journal.pone.0025841] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Accepted: 09/12/2011] [Indexed: 12/11/2022] Open
Abstract
Background We previously showed that equivalence between two identified zebrafish motoneurons is broken by interactions with identified muscle fibers that act as an intermediate target for the axons of these motoneurons. Here we investigate the molecular basis of the signaling interaction between the intermediate target and the motoneurons. Principal Findings We provide evidence that Netrin 1a is an intermediate target-derived signal that causes two equivalent motoneurons to adopt distinct fates. We show that although these two motoneurons express the same Netrin receptors, their axons respond differently to Netrin 1a encountered at the intermediate target. Furthermore, we demonstrate that when Netrin 1a is knocked down, more distal intermediate targets that express other Netrins can also function to break equivalence between these motoneurons. Significance Our results suggest a new role for intermediate targets in breaking neuronal equivalence. The data we present reveal that signals encountered during axon pathfinding can cause equivalent neurons to adopt distinct fates. Such signals may be key in diversifying a neuronal population and leading to correct circuit formation.
Collapse
Affiliation(s)
- Laura A. Hale
- Institute of Neuroscience, University of Oregon, Eugene, Oregon, United States of America
| | - Daniel K. Fowler
- Institute of Neuroscience, University of Oregon, Eugene, Oregon, United States of America
| | - Judith S. Eisen
- Institute of Neuroscience, University of Oregon, Eugene, Oregon, United States of America
- * E-mail:
| |
Collapse
|
30
|
Yang YHC, Szabat M, Bragagnini C, Kott K, Helgason CD, Hoffman BG, Johnson JD. Paracrine signalling loops in adult human and mouse pancreatic islets: netrins modulate beta cell apoptosis signalling via dependence receptors. Diabetologia 2011; 54:828-42. [PMID: 21212933 DOI: 10.1007/s00125-010-2012-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 11/08/2010] [Indexed: 01/08/2023]
Abstract
AIMS/HYPOTHESIS Adult pancreatic islets contain multiple cell types that produce and secrete well characterised hormones, including insulin, glucagon and somatostatin. Although it is increasingly apparent that islets release and respond to more secreted factors than previously thought, systematic analyses are lacking. We therefore sought to identify potential autocrine and/or paracrine islet growth factor loops, and to characterise the function of the netrin family of islet-secreted factors and their receptors, which have been previously unreported in adult islets. METHODS Gene expression databases, islet-specific tag sequencing libraries and microarray datasets of FACS purified beta cells were used to compile a list of secreted factors and receptors present in mouse or human islets. Netrins and their receptors were further assessed using RT-PCR, Western blot analysis and immunofluorescence staining. The roles of netrin-1 and netrin-4 in beta cell function, apoptosis and proliferation were also examined. RESULTS We identified 233 secreted factors and 234 secreted factor receptors in islets. The presence of netrins and their receptors was further confirmed. Downregulation of caspase-3 activation was observed when MIN6 cells were exposed to exogenous netrin-1 and netrin-4 under hyperglycaemic conditions. Reduction in caspase-3 cleavage was linked to the decrease in dependence receptors, neogenin and unc-5 homologue A, as well as the activation of Akt and extracellular signal-regulated protein kinase (ERK) signalling. CONCLUSIONS/INTERPRETATION Our results highlight the large number of potential islet growth factors and point to a context-dependent pro-survival role for netrins in adult beta cells. Since diabetes results from a deficiency in functional beta cell mass, these studies are important steps towards developing novel therapies to improve beta cell survival.
Collapse
Affiliation(s)
- Y H C Yang
- Department of Cellular and Physiological Sciences, University of British Columbia, 5358 Life Sciences Building, 2350 Health Sciences Mall, Vancouver, BC, Canada
| | | | | | | | | | | | | |
Collapse
|
31
|
Clemons A, Haugen M, Le C, Mori A, Tomchaney M, Severson DW, Duman-Scheel M. siRNA-mediated gene targeting in Aedes aegypti embryos reveals that frazzled regulates vector mosquito CNS development. PLoS One 2011; 6:e16730. [PMID: 21304954 PMCID: PMC3031613 DOI: 10.1371/journal.pone.0016730] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Accepted: 12/25/2010] [Indexed: 01/03/2023] Open
Abstract
Although mosquito genome projects uncovered orthologues of many known developmental regulatory genes, extremely little is known about the development of vector mosquitoes. Here, we investigate the role of the Netrin receptor frazzled (fra) during embryonic nerve cord development of two vector mosquito species. Fra expression is detected in neurons just prior to and during axonogenesis in the embryonic ventral nerve cord of Aedes aegypti (dengue vector) and Anopheles gambiae (malaria vector). Analysis of fra function was investigated through siRNA-mediated knockdown in Ae. aegypti embryos. Confirmation of fra knockdown, which was maintained throughout embryogenesis, indicated that microinjection of siRNA is an effective method for studying gene function in Ae. aegypti embryos. Loss of fra during Ae. aegypti development results in thin and missing commissural axons. These defects are qualitatively similar to those observed in Dr. melanogaster fra null mutants. However, the Aa. aegypti knockdown phenotype is stronger and bears resemblance to the Drosophila commissureless mutant phenotype. The results of this investigation, the first targeted knockdown of a gene during vector mosquito embryogenesis, suggest that although Fra plays a critical role during development of the Ae. aegypti ventral nerve cord, mechanisms regulating embryonic commissural axon guidance have evolved in distantly related insects.
Collapse
Affiliation(s)
- Anthony Clemons
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, South Bend, Indiana, United States of America
| | - Morgan Haugen
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, South Bend, Indiana, United States of America
| | - Christy Le
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - Akio Mori
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - Michael Tomchaney
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - David W. Severson
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, South Bend, Indiana, United States of America
| | - Molly Duman-Scheel
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, South Bend, Indiana, United States of America
- * E-mail:
| |
Collapse
|
32
|
Wang J, Valo Z, Bowers CW, Smith DD, Liu Z, Singer-Sam J. Dual DNA methylation patterns in the CNS reveal developmentally poised chromatin and monoallelic expression of critical genes. PLoS One 2010; 5:e13843. [PMID: 21079792 PMCID: PMC2973945 DOI: 10.1371/journal.pone.0013843] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Accepted: 10/15/2010] [Indexed: 11/30/2022] Open
Abstract
As a first step towards discovery of genes expressed from only one allele in the CNS, we used a tiling array assay for DNA sequences that are both methylated and unmethylated (the MAUD assay). We analyzed regulatory regions of the entire mouse brain transcriptome, and found that approximately 10% of the genes assayed showed dual DNA methylation patterns. They include a large subset of genes that display marks of both active and silent, i.e., poised, chromatin during development, consistent with a link between differential DNA methylation and lineage-specific differentiation within the CNS. Sixty-five of the MAUD hits and 57 other genes whose function is of relevance to CNS development and/or disorders were tested for allele-specific expression in F1 hybrid clonal neural stem cell (NSC) lines. Eight MAUD hits and one additional gene showed such expression. They include Lgi1, which causes a subtype of inherited epilepsy that displays autosomal dominance with incomplete penetrance; Gfra2, a receptor for glial cell line-derived neurotrophic factor GDNF that has been linked to kindling epilepsy; Unc5a, a netrin-1 receptor important in neurodevelopment; and Cspg4, a membrane chondroitin sulfate proteoglycan associated with malignant melanoma and astrocytoma in human. Three of the genes, Camk2a, Kcnc4, and Unc5a, show preferential expression of the same allele in all clonal NSC lines tested. The other six genes show a stochastic pattern of monoallelic expression in some NSC lines and bi-allelic expression in others. These results support the estimate that 1–2% of genes expressed in the CNS may be subject to allelic exclusion, and demonstrate that the group includes genes implicated in major disorders of the CNS as well as neurodevelopment.
Collapse
Affiliation(s)
- Jinhui Wang
- Division of Biology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Zuzana Valo
- Division of Biology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Chauncey W. Bowers
- Division of Computational Biology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - David D. Smith
- Division of Biostatistics, City of Hope National Medical Center, Duarte, California, United States of America
| | - Zheng Liu
- Bioinformatics Core Facility, Department of Molecular Medicine, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Judith Singer-Sam
- Division of Biology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
- * E-mail:
| |
Collapse
|
33
|
Manitt C, Labelle-Dumais C, Eng C, Grant A, Mimee A, Stroh T, Flores C. Peri-pubertal emergence of UNC-5 homologue expression by dopamine neurons in rodents. PLoS One 2010; 5:e11463. [PMID: 20628609 PMCID: PMC2900213 DOI: 10.1371/journal.pone.0011463] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2010] [Accepted: 06/11/2010] [Indexed: 01/01/2023] Open
Abstract
Puberty is a critical period in mesocorticolimbic dopamine (DA) system development, particularly for the medial prefrontal cortex (mPFC) projection which achieves maturity in early adulthood. The guidance cue netrin-1 organizes neuronal networks by attracting or repelling cellular processes through DCC (deleted in colorectal cancer) and UNC-5 homologue (UNC5H) receptors, respectively. We have shown that variations in netrin-1 receptor levels lead to selective reorganization of mPFC DA circuitry, and changes in DA-related behaviors, in transgenic mice and in rats. Significantly, these effects are only observed after puberty, suggesting that netrin-1 mediated effects on DA systems vary across development. Here we report on the normal expression of DCC and UNC5H in the ventral tegmental area (VTA) by DA neurons from embryonic life to adulthood, in both mice and rats. We show a dramatic and enduring pubertal change in the ratio of DCC:UNC5H receptors, reflecting a shift toward predominant UNC5H function. This shift in DCC:UNC5H ratio coincides with the pubertal emergence of UNC5H expression by VTA DA neurons. Although the distribution of DCC and UNC5H by VTA DA neurons changes during puberty, the pattern of netrin-1 immunoreactivity in these cells does not. Together, our findings suggest that DCC:UNC5H ratios in DA neurons at critical periods may have important consequences for the organization and function of mesocorticolimbic DA systems.
Collapse
Affiliation(s)
- Colleen Manitt
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, Canada
| | - Cassandre Labelle-Dumais
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, Canada
| | - Conrad Eng
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, Canada
| | - Alanna Grant
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, Canada
| | - Andrea Mimee
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, Canada
| | - Thomas Stroh
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Cecilia Flores
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, Canada
| |
Collapse
|
34
|
Mrkusich EM, Osman ZB, Bates KE, Marchingo JM, Duman-Scheel M, Whitington PM. Netrin-guided accessory cell morphogenesis dictates the dendrite orientation and migration of a Drosophila sensory neuron. Development 2010; 137:2227-35. [PMID: 20530550 PMCID: PMC2882139 DOI: 10.1242/dev.047795] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/27/2010] [Indexed: 11/20/2022]
Abstract
Accessory cells, which include glia and other cell types that develop in close association with neurons, have been shown to play key roles in regulating neuron development. However, the underlying molecular and cellular mechanisms remain poorly understood. A particularly intimate association between accessory cells and neurons is found in insect chordotonal organs. We have found that the cap cell, one of two accessory cells of v'ch1, a chordotonal organ in the Drosophila embryo, strongly influences the development of its associated neuron. As it projects a long dorsally directed cellular extension, the cap cell reorients the dendrite of the v'ch1 neuron and tows its cell body dorsally. Cap cell morphogenesis is regulated by Netrin-A, which is produced by epidermal cells at the destination of the cap cell process. In Netrin-A mutant embryos, the cap cell forms an aberrant, ventrally directed process. As the cap cell maintains a close physical connection with the tip of the dendrite, the latter is dragged into an abnormal position and orientation, and the neuron fails to undergo its normal dorsal migration. Misexpression of Netrin-A in oenocytes, secretory cells that lie ventral to the cap cell, leads to aberrant cap cell morphogenesis, suggesting that Netrin-A acts as an instructive cue to direct the growth of the cap cell process. The netrin receptor Frazzled is required for normal cap cell morphogenesis, and mutant rescue experiments indicate that it acts in a cell-autonomous fashion.
Collapse
Affiliation(s)
- Eli M. Mrkusich
- Department of Anatomy and Cell Biology, University of Melbourne, VIC 3010, Australia
| | - Zalina B. Osman
- Department of Anatomy and Cell Biology, University of Melbourne, VIC 3010, Australia
| | - Karen E. Bates
- Department of Anatomy and Cell Biology, University of Melbourne, VIC 3010, Australia
- Department of Zoology, University of Hawaii, Honolulu, HI 96822, USA
| | - Julia M. Marchingo
- Department of Anatomy and Cell Biology, University of Melbourne, VIC 3010, Australia
| | - Molly Duman-Scheel
- Department of Medical and Molecular Genetics, Indiana University School of Medicine-South Bend and Department of Biological Sciences, University of Notre Dame, Raclin-Carmichael Hall, 1234 Notre Dame Avenue, South Bend, IN 45517, USA
| | - Paul M. Whitington
- Department of Anatomy and Cell Biology, University of Melbourne, VIC 3010, Australia
| |
Collapse
|
35
|
Ghosal K, Naples SP, Rabe AR, Killian KA. Agonistic behavior and electrical stimulation of the antennae induces Fos-like protein expression in the male cricket brain. Arch Insect Biochem Physiol 2010; 74:38-51. [PMID: 20422717 DOI: 10.1002/arch.20360] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Immediate early genes (IEG) such as c-Fos and Fos-related antigens (FRA) have been used as markers of neuronal activation. In this study, we determined whether the expression of c-Fos/FRAs is increased in the brains of adult male Acheta domesticus crickets following agonistic interactions. We looked for c-Fos/FRA proteins in the brain of un-fought, control male crickets and of dominant and subordinate male crickets sacrificed at different time periods following an agonistic interaction. Using immunoblot analysis, we found four different c-Fos/FRA-like proteins in the adult cricket brain. Continuous agonistic interaction increased c-Fos/FRA protein expression in the brains of subordinate males compared to control and dominant males. In addition, direct electrical stimulation of the male cricket antennae increased c-Fos/FRA-like protein in the brain. We identified the specific brain regions that exhibit c-Fos/FRA-like immunoreactivity in crickets. We detected c-Fos/FRA-like cellular immunoreactivity in different functional regions of the adult brain including the pars intercerebralis, protocerebrum, deutocerebrum, and the cortex of the mushroom bodies.
Collapse
Affiliation(s)
- Kaushik Ghosal
- Department of Zoology and Center for Neuroscience, Miami University, Oxford, Ohio 45056, USA
| | | | | | | |
Collapse
|
36
|
Dorsten JN, Varughese BE, Karmo S, Seeger MA, VanBerkum MFA. In the absence of frazzled over-expression of Abelson tyrosine kinase disrupts commissure formation and causes axons to leave the embryonic CNS. PLoS One 2010; 5:e9822. [PMID: 20352105 PMCID: PMC2843715 DOI: 10.1371/journal.pone.0009822] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Accepted: 02/27/2010] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND In the Drosophila embryonic nerve cord, the formation of commissures require both the chemoattractive Netrin receptor Frazzled (Fra) and the Abelson (Abl) cytoplasmic tyrosine kinase. Abl binds to the cytoplasmic domain of Fra and loss-of-function mutations in abl enhance fra-dependent commissural defects. To further test Abl's role in attractive signaling, we over-expressed Abl in Fra mutants anticipating rescue of commissures. METHODOLOGY/PRINCIPAL FINDINGS The Gal4-UAS system was used to pan-neurally over-express Abl in homozygous fra embryos. Surprisingly, this led to a significant decrease in both posterior and anterior commissure formation and induced some commissural and longitudinal axons to project beyond the CNS/PNS border. Re-expressing wild-type Fra, or Fra mutants with a P-motif deleted, revert both commissural and exiting phenotypes, indicating that Fra is required but not a specific P-motif. This is supported by S2 cell experiments demonstrating that Abl binds to Fra independent of any specific P-motif and that Fra continues to be phosphorylated when individual P-motifs are removed. Decreasing midline repulsion by reducing Robo signaling had no effect on the Abl phenotype and the phenotypes still occur in a Netrin mutant. Pan-neural over-expression of activated Rac or Cdc42 in a fra mutant also induced a significant loss in commissures, but axons did not exit the CNS. CONCLUSION/SIGNIFICANCE Taken together, these data suggest that Fra activity is required to correctly regulate Abl-dependent cytoskeletal dynamics underlying commissure formation. In the absence of Fra, increased Abl activity appears to be incorrectly utilized downstream of other guidance receptors resulting in a loss of commissures and the abnormal projections of some axons beyond the CNS/PNS border.
Collapse
Affiliation(s)
- Joy N. Dorsten
- Department of Biological Sciences, Wayne State University, Detroit, Michigan, United States of America
| | - Bridget E. Varughese
- Department of Biological Sciences, Wayne State University, Detroit, Michigan, United States of America
| | - Stephanie Karmo
- Department of Biological Sciences, Wayne State University, Detroit, Michigan, United States of America
| | - Mark A. Seeger
- Department of Molecular Genetics and Center for Molecular Neurobiology, Ohio State University, Columbus, Ohio, United States of America
| | - Mark F. A. VanBerkum
- Department of Biological Sciences, Wayne State University, Detroit, Michigan, United States of America
| |
Collapse
|
37
|
Hibi K, Goto T, Mizukami H, Kitamura Y, Sakata M, Saito M, Ishibashi K, Kigawa G, Nemoto H, Sanada Y. MGMT gene is aberrantly methylated from the early stages of colorectal cancers. Hepatogastroenterology 2009; 56:1642-1644. [PMID: 20214209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
BACKGROUND/AIMS Recently, Herfarth et al. reported that a subset of colorectal cancers was characterized by a specific methylation pattern in the MGMT promoter associated with reduced MGMT expression. METHODOLOGY Methylation status of the MGMT gene was examined in primary carcinomas and the corresponding normal tissues derived from 48 patients with colorectal cancer using quantitative methylation-specific PCR (qMSP) and the correlation between the methylation status and the clinicopathological findings was evaluated. RESULTS Aberrant methylation of the MGMT gene was detected in 10 out of the 48 (21%) primary colorectal cancers. The present study results suggested that the aberrant methylation of the MGMT gene was specific and frequently observed in colorectal cancers. The clinicopathological data were correlated with the methylation results. No significant correlations were observed between the presentation of abnormal methylation in the colorectal carcinomas and patient gender or age, maximal tumor size, tumor extent, tumor site, histology, lymph node metastasis, and Dukes stage. CONCLUSION All stages of colorectal cancers presented MGMT methylation, indicating that the MGMT gene has been methylated from the early stages of colorectal cancers.
Collapse
Affiliation(s)
- Kenji Hibi
- Department of Surgery, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-ku, Yokohama 227-8501, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Hibi K, Sakata M, Sakuraba K, Kitamura YH, Shirahata A, Goto T, Mizukami H, Saito M, Ishibashi K, Kigawa G, Nemoto H, Sanada Y. Changes in UNC5C gene methylation during human gastric carcinogenesis. Anticancer Res 2009; 29:4397-4399. [PMID: 20032384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
BACKGROUND UNC5C, one of the netrin-1 receptors, belongs to the functional dependence receptor family, members of which share the ability to induce apoptosis in the absence of their ligands. Recently, aberrant methylation of the UNC5C gene was found in 34 out of 49 (69%) primary colon carcinomas. MATERIALS AND METHODS The methylation status of the UNC5C gene was examined in primary carcinomas and the corresponding normal tissues derived from 36 patients with gastric cancer using quantitative methylation-specific polymerase chain reaction, and the correlation between the methylation status and the clinicopathological findings was evaluated. RESULTS Aberrant methylation of the UNC5C gene was detected in 9 out of the 36 (25%) primary gastric carcinomas. A significant difference was observed in regard to the TNM stage (p=0.0455). CONCLUSION UNC5C methylation was observed in the course of gastric carcinogenesis and disappeared in highly advanced gastric carcinomas.
Collapse
Affiliation(s)
- Kenji Hibi
- Department of Surgery, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama 227-8501, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Zhang H, Wu F, Tao YM, Yang LY. [Down-regulated expression of UNC5b related to hepatocellular carcinoma angiogenesis]. Zhonghua Wai Ke Za Zhi 2009; 47:1569-1573. [PMID: 20092749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To investigate the relationship between UNC5b gene expression and angiogenesis of hepatocellular carcinoma (HCC). METHODS In situ hybridization was performed to detect the expression of UNC5b mRNA in HCC samples, paracarcinomatous liver tissues samples and normal liver samples. The relationship between UNC5b mRNA expression and the HCC clinicopathological features were also analyzed. Human umbilical artery endothelial cells were isolated and stimulated with HCC tissues homogenate, vascular endothelial growth factor and basic fibroblast growth factor. Then RT-PCR was employed to detect the expression of UNC5b mRNA in normal HUAEC as well as activated HUAEC. RESULTS In situ hybridization results showed that UNC5b mRNA expression was detected majorly in endothelial cells of all normal liver tissues, and partial PCLTs but was weak or even undetectable in endothelial cells of the corresponding HCC tissues. The expression levels of UNC5b gene in PCLTs were significantly correlated with capsular formation of HCC. Furthermore, RT-PCR results showed that the expression levels of UNC5b mRNA in activated HUAEC were significantly higher than those in normal HUAEC. CONCLUSIONS Down-regulation of UNC5b gene expression is related to angiogenesis of HCC, which may be associated with the progression of HCC.
Collapse
Affiliation(s)
- Hua Zhang
- Department of Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | | | | | | |
Collapse
|
40
|
Brierley DJ, Blanc E, Reddy OV, VijayRaghavan K, Williams DW. Dendritic targeting in the leg neuropil of Drosophila: the role of midline signalling molecules in generating a myotopic map. PLoS Biol 2009; 7:e1000199. [PMID: 19771147 PMCID: PMC2737123 DOI: 10.1371/journal.pbio.1000199] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Accepted: 08/12/2009] [Indexed: 01/19/2023] Open
Abstract
Neural maps are emergent, highly ordered structures that are essential for organizing and presenting synaptic information. Within the embryonic nervous system of Drosophila motoneuron dendrites are organized topographically as a myotopic map that reflects their pattern of innervation in the muscle field. Here we reveal that this fundamental organizational principle exists in adult Drosophila, where the dendrites of leg motoneurons also generate a myotopic map. A single postembryonic neuroblast sequentially generates different leg motoneuron subtypes, starting with those innervating proximal targets and medial neuropil regions and producing progeny that innervate distal muscle targets and lateral neuropil later in the lineage. Thus the cellular distinctions in peripheral targets and central dendritic domains, which make up the myotopic map, are linked to the birth-order of these motoneurons. Our developmental analysis of dendrite growth reveals that this myotopic map is generated by targeting. We demonstrate that the medio-lateral positioning of motoneuron dendrites in the leg neuropil is controlled by the midline signalling systems Slit-Robo and Netrin-Fra. These results reveal that dendritic targeting plays a major role in the formation of myotopic maps and suggests that the coordinate spatial control of both pre- and postsynaptic elements by global neuropilar signals may be an important mechanism for establishing the specificity of synaptic connections.
Collapse
Affiliation(s)
- David J. Brierley
- Medical Research Council (MRC) Centre for Developmental Neurobiology, King's College London, London, United Kingdom
| | - Eric Blanc
- Medical Research Council (MRC) Centre for Developmental Neurobiology, King's College London, London, United Kingdom
| | - O. Venkateswara Reddy
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
| | - K. VijayRaghavan
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
| | - Darren W. Williams
- Medical Research Council (MRC) Centre for Developmental Neurobiology, King's College London, London, United Kingdom
| |
Collapse
|
41
|
Mauss A, Tripodi M, Evers JF, Landgraf M. Midline signalling systems direct the formation of a neural map by dendritic targeting in the Drosophila motor system. PLoS Biol 2009; 7:e1000200. [PMID: 19771146 PMCID: PMC2736389 DOI: 10.1371/journal.pbio.1000200] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Accepted: 08/12/2009] [Indexed: 12/30/2022] Open
Abstract
A fundamental strategy for organising connections in the nervous system is the formation of neural maps. Map formation has been most intensively studied in sensory systems where the central arrangement of axon terminals reflects the distribution of sensory neuron cell bodies in the periphery or the sensory modality. This straightforward link between anatomy and function has facilitated tremendous progress in identifying cellular and molecular mechanisms that underpin map development. Much less is known about the way in which networks that underlie locomotion are organised. We recently showed that in the Drosophila embryo, dendrites of motorneurons form a neural map, being arranged topographically in the antero-posterior axis to represent the distribution of their target muscles in the periphery. However, the way in which a dendritic myotopic map forms has not been resolved and whether postsynaptic dendrites are involved in establishing sets of connections has been relatively little explored. In this study, we show that motorneurons also form a myotopic map in a second neuropile axis, with respect to the ventral midline, and they achieve this by targeting their dendrites to distinct medio-lateral territories. We demonstrate that this map is "hard-wired"; that is, it forms in the absence of excitatory synaptic inputs or when presynaptic terminals have been displaced. We show that the midline signalling systems Slit/Robo and Netrin/Frazzled are the main molecular mechanisms that underlie dendritic targeting with respect to the midline. Robo and Frazzled are required cell-autonomously in motorneurons and the balance of their opposite actions determines the dendritic target territory. A quantitative analysis shows that dendritic morphology emerges as guidance cue receptors determine the distribution of the available dendrites, whose total length and branching frequency are specified by other cell intrinsic programmes. Our results suggest that the formation of dendritic myotopic maps in response to midline guidance cues may be a conserved strategy for organising connections in motor systems. We further propose that sets of connections may be specified, at least to a degree, by global patterning systems that deliver pre- and postsynaptic partner terminals to common "meeting regions."
Collapse
Affiliation(s)
- Alex Mauss
- Department of Zoology, University of Cambridge, Cambridge, United Kingdom
| | - Marco Tripodi
- Friedrich Miescher Institut and Biozentrum, Department of Cell Biology, University of Basel, Basel, Switzerland
| | - Jan Felix Evers
- Department of Zoology, University of Cambridge, Cambridge, United Kingdom
| | - Matthias Landgraf
- Department of Zoology, University of Cambridge, Cambridge, United Kingdom
| |
Collapse
|
42
|
Karaulanov E, Böttcher RT, Stannek P, Wu W, Rau M, Ogata S, Cho KWY, Niehrs C. Unc5B interacts with FLRT3 and Rnd1 to modulate cell adhesion in Xenopus embryos. PLoS One 2009; 4:e5742. [PMID: 19492039 PMCID: PMC2683942 DOI: 10.1371/journal.pone.0005742] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Accepted: 04/27/2009] [Indexed: 12/29/2022] Open
Abstract
The FLRT family of transmembrane proteins has been implicated in the regulation of FGF signalling, neurite outgrowth, homotypic cell sorting and cadherin-mediated adhesion. In an expression screen we identified the Netrin receptors Unc5B and Unc5D as high-affinity FLRT3 interactors. Upon overexpression, Unc5B phenocopies FLRT3 and both proteins synergize in inducing cell deadhesion in Xenopus embryos. Morpholino knock-downs of Unc5B and FLRT3 synergistically affect Xenopus development and induce morphogenetic defects. The small GTPase Rnd1, which transmits FLRT3 deadhesion activity, physically and functionally interacts with Unc5B, and mediates its effect on cell adhesion. The results suggest that FLRT3, Unc5B and Rnd1 proteins interact to modulate cell adhesion in early Xenopus development.
Collapse
Affiliation(s)
- Emil Karaulanov
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany
| | - Ralph T. Böttcher
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany
| | - Peter Stannek
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany
| | - Wei Wu
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany
| | - Marlene Rau
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany
| | - Souichi Ogata
- Department of Developmental and Cell Biology, Developmental Biology Center, University of California Irvine, Irvine, California, United States of America
| | - Ken W. Y. Cho
- Department of Developmental and Cell Biology, Developmental Biology Center, University of California Irvine, Irvine, California, United States of America
| | - Christof Niehrs
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, German Cancer Research Center, Heidelberg, Germany
- * E-mail:
| |
Collapse
|
43
|
Liu QX, Hiramoto M, Ueda H, Gojobori T, Hiromi Y, Hirose S. Midline governs axon pathfinding by coordinating expression of two major guidance systems. Genes Dev 2009; 23:1165-70. [PMID: 19451216 PMCID: PMC2685537 DOI: 10.1101/gad.1774209] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Accepted: 03/31/2009] [Indexed: 01/31/2023]
Abstract
Formation of the neural network requires concerted action of multiple axon guidance systems. How neurons orchestrate expression of multiple guidance genes is poorly understood. Here, we show that Drosophila T-box protein Midline controls expression of genes encoding components of two major guidance systems: Frazzled, ROBO, and Slit. In midline mutant, expression of all these molecules are reduced, resulting in severe axon guidance defects, whereas misexpression of Midline induces their expression. Midline is present on the promoter regions of these genes, indicating that Midline controls transcription directly. We propose that Midline controls axon pathfinding through coordinating the two guidance systems.
Collapse
Affiliation(s)
- Qing-Xin Liu
- Department of Developmental Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
- Center for Information Biology and DNA Data Bank of Japan, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
| | - Masaki Hiramoto
- Department of Developmental Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
| | - Hitoshi Ueda
- Department of Developmental Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
- The Graduate School of Natural Science and Technology, and Department of Biology, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Takashi Gojobori
- Center for Information Biology and DNA Data Bank of Japan, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
- Department of Genetics, Graduate University for Advanced Studies (SOKENDAI), Mishima, Shizuoka 411-8540, Japan
| | - Yasushi Hiromi
- Department of Developmental Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
- Department of Genetics, Graduate University for Advanced Studies (SOKENDAI), Mishima, Shizuoka 411-8540, Japan
| | - Susumu Hirose
- Department of Developmental Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
- Department of Genetics, Graduate University for Advanced Studies (SOKENDAI), Mishima, Shizuoka 411-8540, Japan
| |
Collapse
|
44
|
Abstract
Precise wiring of the nervous system depends on coordinating the action of conserved families of proteins that direct axons to their appropriate targets. Slit-roundabout repulsion and netrin-deleted in colorectal cancer (DCC) (frazzled) attraction must be tightly regulated to control midline axon guidance in vertebrates and invertebrates, but the mechanism mediating this regulation is poorly defined. Here, we show that the Fra receptor has two genetically separable functions in regulating midline guidance in Drosophila. First, Fra mediates canonical chemoattraction in response to netrin, and, second, it functions independently of netrin to activate commissureless transcription, allowing attraction to be coupled to the down-regulation of repulsion in precrossing commissural axons.
Collapse
Affiliation(s)
- Long Yang
- Department of Neuroscience, University of Pennsylvania School of Medicine, 1113 BRB2/3, 421 Curie Blvd., Philadelphia, PA 19104
| | - David S. Garbe
- Department of Neuroscience, University of Pennsylvania School of Medicine, 1113 BRB2/3, 421 Curie Blvd., Philadelphia, PA 19104
| | - Greg J. Bashaw
- Department of Neuroscience, University of Pennsylvania School of Medicine, 1113 BRB2/3, 421 Curie Blvd., Philadelphia, PA 19104
| |
Collapse
|
45
|
Abstract
The vascular system of vertebrates consists of an organized, branched network of arteries, veins, and capillaries that penetrates all the tissues of the body. One of the most striking features of the vascular system is that its branching pattern is highly stereotyped, with major and secondary branches forming at specific sites and developing highly conserved organ-specific vascular patterns. The factors controlling vascular patterning are not yet completely understood. Recent studies have highlighted the anatomic and structural similarities between blood vessels and nerves. The 2 networks are often aligned, with nerve fibers and blood vessels following parallel routes. Furthermore, both systems require precise control over their guidance and growth. Several molecules with attractive and repulsive properties have been found to modulate the proper guidance of both nerves and blood vessels. These include the Semaphorins, the Slits, and the Netrins and their receptors. In this review, we describe the molecular mechanisms by which blood vessels and axons achieve proper path finding and the molecular cues that are involved in their guidance.
Collapse
Affiliation(s)
- Bruno Larrivée
- Institut National de la Santé et de la Recherche Médicale, U833 and Collège de France, Paris, France
| | | | | | | | | |
Collapse
|
46
|
|
47
|
Yang Y, Wang Y, DU Y, Zhu JW, Gao H, Zou L. [Correlation of netrin-1 expression with invasion of extra villous trophoblasts]. Zhonghua Fu Chan Ke Za Zhi 2009; 44:131-134. [PMID: 19570425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To investigate mechanism of netrin-1 regulating invasion of extra villous trophoblasts. METHODS RT-PCR was used to detect six receptors expression including UNC5A, UNC5B, UNC5C, UNC5D, DCC and neogenin in extra villous trophoblast cell line TEV-1. The TEV-1 cells were cultured and devided into seven groups according to the concentration of netrin-1 adding into the medium, which include 10 microg/L, 50 microg/L, 100 microg/L, 500 microg/L, 1000 microg/L, 5000 microg/L and the control (the concentration of netrin-1 was 0 microg/L)groups. The proliferation and invasion of TEV-1 induced by netrin-1 were determined by CCK-8 assay and transwell invasion assay respectively. RESULTS (1) Only neogenin and UNC5B were found to be expressed on TEV-1 by RT-PCR method. (2) In CCK-8 proliferation assay, after 72 hours culture, the proliferation of TEV-1 were 1.55 +/- 0.29 in 10 microg/L, 1.72 +/- 0.31 in 50 microg/L, 2.15 +/- 0.35 in 100 microg/L, 1.42 +/- 0.25 in 500 microg/L, 1.50 +/- 0.27 in 1000 microg/L, and 1.38 +/- 0.23 in 5000 microg/L group, which were all higher than 1.00 +/- 0.16 in control group significantly (P < 0.05). (3) In matrigel invasion assay, after 6 hours culture, the number of the trans-membrane cells in various netrin-1 group, including 41 +/- 4 in 10 microg/L, 47 +/- 5 in 50 microg/L, 55 +/- 6 in 100 microg/L, 44 +/- 5 in 500 microg/L, 43 +/- 5 in 1000 microg/L and 42 +/- 5 in 5000 microg/L group, were all higher than 30 +/- 4 in control group with statistical significance (P < 0.05). (4) The fold changes of neogenin were 1.50 +/- 0.16 in 10 microg/L, 1.83 +/- 0.19 in 50 microg/L, 2.24 +/- 0.25 in 100 microg/L, 2.12 +/- 0.24 in 500 microg/L, 2.12 +/- 0.23 in 1000 microg/L and 2.13 +/- 0.23 in 5000 microg/L group, which were all higher than 1.00 +/- 0.11 in control group significantly (P < 0.05). There were significant difference between group 10 microg/L and 50 microg/L, group 50 microg/L and 100 microg/L (P < 0.05). There were no significant difference between group 100 microg/L and 500 microg/L, group 1000 microg/L and 5000 microg/L (P > 0.05). (5) The fold changes of UNC5B 1.09 +/- 0.11 in 10 microg/L, 1.47 +/- 0.14 in 50 microg/L, 1.61 +/- 0.16 in 100 microg/L, 1.85 +/- 0.19 in 500 microg/L, 2.21 +/- 0.21 in 1000 microg/L and 2.42 +/- 0.23 in 5000 microg/L group, were all higher significantly when compared with 1.00 +/- 0.07 in control group (P < 0.05). There were significant difference between all groups (P < 0.05). CONCLUSION Netrin-1 can promote the potential of proliferation and invasion of extravillous trophoblasts in vitro through its receptors including neogenin and UNC5B.
Collapse
Affiliation(s)
- Yun Yang
- Department of Obstetrics and Gynecology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | | | | | | | | | | |
Collapse
|
48
|
Abstract
BACKGROUND/AIMS Netrin-1 plays a key role in the prevention of ischemia reperfusion induced kidney injury by suppressing apoptosis and increasing epithelial cell proliferation. Netrin-1 binds to cell-surface receptors, which include members of the deleted in colorectal cancer (DCC and neogenin), UNC5 homologue and integrin families, to mediate its actions. Kidney is known to express three netrin-1 receptors mRNA (UNC5B, UNC5C and neogenin) abundantly. However, the intrarenal localization of these receptors is unknown. METHODS We analyzed netrin-1 receptor expression in normal kidney and after ischemia reperfusion injury by real-time RT-PCR and immunohistochemistry. RESULTS We show that UNC5B expression is restricted to S3 segments of proximal tubules, whereas UNC5C expression is restricted to distal tubules. There was no expression of UNC5B and UNC5C in the glomerulus. Neogenin is expressed in all segments of the nephron including the glomerulus. Neogenin expression was restricted to the basolateral membrane in tubular epithelial cells. The expression patterns of UNC5B, UNC5C and neogenin were not altered after ischemia reperfusion injury. In contrast to protein expression, mRNA expression was significantly down-regulated after ischemia reperfusion injury of the kidney. CONCLUSION Netrin-1 receptors were expressed in specific segments and may have differential functions in different segments of the nephron.
Collapse
Affiliation(s)
- Weiwei Wang
- Division of Nephrology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | | |
Collapse
|
49
|
Hibi K, Mizukami H, Shirahata A, Goto T, Sakata M, Saito M, Ishibashi K, Kigawa G, Nemoto H, Sanada Y. Aberrant methylation of the UNC5C gene is frequently detected in advanced colorectal cancer. Anticancer Res 2009; 29:271-273. [PMID: 19331160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
BACKGROUND UNC5C, one of the Netrin-1 receptors, belongs to the functional dependence receptor family, members of which share the ability to induce apoptosis in the absence of their ligands. Recently, two reports indicated that UNC5C methylation was closely associated with loss of gene expression in colorectal cancer. MATERIALS AND METHODS The methylation status of the UNC5C gene was examined in primary carcinomas and the corresponding normal tissues derived from 49 patients with colorectal cancer using quantitative methylation-specific polymerase chain reaction (qMSP) and the correlation between the methylation status and the clinicopathological findings was evaluated. RESULTS Aberrant methylation of the UNC5C gene was detected in 34 out of the 49 (69%) primary colon carcinomas, suggesting that the aberrant methylation of UNC5C was frequent in colorectal cancer. The clinicopathological data were then tested for correlation with this result. A significantly greater proportion of cases with methylated UNC5C was found in Dukes' stage C (p = 0.0380) than in earlier stages. CONCLUSION UNC5C might act as a tumor suppressor and UNC5C methylation might present a malignant potential in colorectal cancer.
Collapse
Affiliation(s)
- Kenji Hibi
- Department of Surgery, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-ku, Yokohama 227-8501, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Abstract
MAGE genes were first described as cancer-testis antigens, which are silenced in normal adult tissues but aberrantly expressed in tumor cells. The short peptides, derived from the degradation of MAGE transcripts, are the source of antigens that cause tumor rejection reactions when presented in the context of major histocompatibility complex. The recent discovery of a subset of genes that contain the structurally conserved MAGE homology domain (MHD) has accelerated the investigation into the normal function of MAGE genes. This new type of MAGE gene is normally expressed in embryonal and adult tissue, especially the brain. MAGE-D1, also known as NRAGE or Dlxin-1, functions as an adaptor protein that mediates multiple signaling pathways, including NGFR (p75NTR) and UNC5H1-induced apoptosis and Dlx/Msx-mediated transcription. Loss of a different MAGE family member, Necdin, which works as a cell cycle regulator, may play a role in the pathogenesis of Prader-Willi syndrome, a neurobehavioral disorder. In this article, the authors discuss recent findings concerning the structure and function of new MAGE genes, primarily focusing on MAGE-D1. Because some MAGE-D subfamily proteins share significant homology within the MHD, these recent discoveries on MAGE-D1 may give insight into the function of other MAGE-D proteins.
Collapse
Affiliation(s)
- Aya Sasaki
- Division of the Clinical Pathology, Sapporo Medical University Hospital, Hokkaido, Japan
| | | | | |
Collapse
|