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Wang YC, Chen RF, Liu KF, Chen WY, Lee CC, Kuo YR. Adipose-derived stem cell modulate tolerogenic dendritic cell-induced T cell regulation is correlated with activation of Notch-NFκB signaling. Cytotherapy 2024; 26:890-898. [PMID: 38625070 DOI: 10.1016/j.jcyt.2024.03.482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 03/01/2024] [Accepted: 03/22/2024] [Indexed: 04/17/2024]
Abstract
BACKGROUND Adipose-derived stem cells (ASCs) are recognized for their potential immunomodulatory properties. In the immune system, tolerogenic dendritic cells (DCs), characterized by an immature phenotype, play a crucial role in inducing regulatory T cells (Tregs) and promoting immune tolerance. Notch1 signaling has been identified as a key regulator in the development and function of DCs. However, the precise involvement of Notch1 pathway in ASC-mediated modulation of tolerogenic DCs and its impact on immune modulation remain to be fully elucidated. This study aims to investigate the interplay between ASCs and DCs, focusing the role of Notch1 signaling and downstream pathways in ASC-modulated tolerogenic DCs. METHODS Rat bone marrow-derived myeloid DCs were directly co-cultured with ASCs to generate ASC-treated DCs (ASC-DCs). Notch signaling was inhibited using DAPT, while NFκB pathways were inhibited by NEMO binding domain peptide and si-NIK. Flow cytometry assessed DC phenotypes. Real-time quantitative PCR, Western blotting and immunofluorescence determined the expression of Notch1, Jagged1 and the p52/RelB complex in ASC- DCs. RESULTS Notch1 and Jagged1 were highly expressed on both DCs and ASCs. ASC-DCs displayed significantly reduced levels of CD80, CD86 and MHC II compared to mature DCs. Inhibiting the Notch pathway with DAPT reversed the dedifferentiation effects. The percentage of induced CD25+/FOXP3+/CD4+ Tregs decreased when ASC-DCs were treated with DAPT (inhibition of the Notch pathway) and si-NIK (inhibition of the non-canonical NFκB pathway). CONCLUSIONS ASCs induce DC tolerogenicity by inhibiting maturation and promoting downstream Treg generation, involving the Notch and NFκB pathways. ASC-induced tolerogenic DCs can be a potential immunomodulatory tool for clinical application.
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Affiliation(s)
- Yu-Chi Wang
- Division of Plastic and Reconstruction Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Rong-Fu Chen
- Division of Plastic and Reconstruction Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Keng-Fan Liu
- Division of Plastic and Reconstruction Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Wei-Yu Chen
- Division of Plastic and Reconstruction Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Chia-Chun Lee
- Division of Plastic and Reconstruction Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Yur-Ren Kuo
- Division of Plastic and Reconstruction Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Faculty of Medicine, College of Medicine, Orthopaedic Research Center, Regenerative Medicine, and Cell Therapy Research Center; Department of Surgery, Kaohsiung Ta-Tong Municipal Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan; SingHealth Duke-NUS Musculoskeletal Sciences Academic Clinical Programme, Singapore.
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Abstract
Cancer stem cells (CSCs) are a subpopulation of cancer that can self-renew and differentiate into large tumor masses. Evidence accumulated to date shows that CSCs affect tumor proliferation, recurrence, and resistance to chemotherapy. Recent studies have shown that, like stem cells, CSCs maintain cells with self-renewal capacity by means of asymmetric division and promote cell proliferation by means of symmetric division. This cell division is regulated by fate determinants, such as the NUMB protein, which recently has also been confirmed as a tumor suppressor. Loss of NUMB expression leads to uncontrolled proliferation and amplification of the CSC pool, which promotes the Notch signaling pathway and reduces the expression of the p53 protein. NUMB genes are alternatively spliced to produce six functionally distinct isoforms. An interesting recent discovery is that the protein NUMB isoform produced by alternative splicing of NUMB plays an important role in promoting carcinogenesis. In this review, we summarize the known functions of NUMB and NUMB isoforms related to the proliferation and generation of CSCs.
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Affiliation(s)
- Hye Yeon Choi
- Department of Molecular Microbiology and Immunology, University of Southern California, Los Angeles, CA 90033, USA
| | - Jaekwon Seok
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
| | - Geun-Ho Kang
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
| | - Kyung Min Lim
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
| | - Ssang-Goo Cho
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
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3
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Choi HY, Seok J, Kang GH, Lim KM, Cho SG. The role of NUMB/NUMB isoforms in cancer stem cells. BMB Rep 2021; 54:335-343. [PMID: 34078527 PMCID: PMC8328821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/04/2021] [Accepted: 05/17/2021] [Indexed: 12/17/2023] Open
Abstract
Cancer stem cells (CSCs) are a subpopulation of cancer that can self-renew and differentiate into large tumor masses. Evidence accumulated to date shows that CSCs affect tumor proliferation, recurrence, and resistance to chemotherapy. Recent studies have shown that, like stem cells, CSCs maintain cells with self-renewal capacity by means of asymmetric division and promote cell proliferation by means of symmetric division. This cell division is regulated by fate determinants, such as the NUMB protein, which recently has also been confirmed as a tumor suppressor. Loss of NUMB expression leads to uncontrolled proliferation and amplification of the CSC pool, which promotes the Notch signaling pathway and reduces the expression of the p53 protein. NUMB genes are alternatively spliced to produce six functionally distinct isoforms. An interesting recent discovery is that the protein NUMB isoform produced by alternative splicing of NUMB plays an important role in promoting carcinogenesis. In this review, we summarize the known functions of NUMB and NUMB isoforms related to the proliferation and generation of CSCs. [BMB Reports 2021; 54(7): 335-343].
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Affiliation(s)
- Hye Yeon Choi
- Department of Molecular Microbiology and Immunology, University of Southern California, Los Angeles, CA 90033, USA, Seoul 05029, Korea
| | - Jaekwon Seok
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
| | - Geun-Ho Kang
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
| | - Kyung Min Lim
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
| | - Ssang-Goo Cho
- Department of Stem Cell and Regenerative Biotechnology, Molecular & Cellular Reprogramming Center (MCRC), Konkuk University, Seoul 05029, Korea
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4
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Bertrand FE. The cross-talk of NOTCH and GSK-3 signaling in colon and other cancers. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2020; 1867:118738. [PMID: 32389646 DOI: 10.1016/j.bbamcr.2020.118738] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/01/2020] [Accepted: 05/03/2020] [Indexed: 12/14/2022]
Abstract
The GSK-3 kinases, GSK-3α and GSK-3β, have a central role in regulating multiple cellular processes such as glycogen synthesis, insulin signaling, cell proliferation and apoptosis. GSK-3β is the most well studied, and was originally described for its role in regulating glycogen synthase. GSK-3β has been studied as a participant in the oncogenic process in a variety of cancers due to its intersection with the PTEN/PI3K/AKT and RAS/RAF/MEK/ERK pathways. Dysregulated signaling through the Notch family of receptors can also promote oncogenesis. Normal Notch receptor signaling regulates cell fate determination in stem cell pools. GSK-3β and Notch share similar targets such β-catenin and the WNT pathway. WNT and β-catenin are involved in several oncogenic processes including those of the colon. In addition, GSK-3β may directly regulate aspects of Notch signaling. This review describes how crosstalk between GSK-3β and Notch can promote oncogenesis, using colon cancer as the primary example.
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Affiliation(s)
- Fred E Bertrand
- Department of Nutrition Sciences, School of Health Professions, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
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5
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Reynolds ER, Himmelwright R, Sanginiti C, Pfaffmann JO. An agent-based model of the Notch signaling pathway elucidates three levels of complexity in the determination of developmental patterning. BMC SYSTEMS BIOLOGY 2019; 13:7. [PMID: 30642357 PMCID: PMC6332573 DOI: 10.1186/s12918-018-0672-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 12/17/2018] [Indexed: 01/15/2023]
Abstract
BACKGROUND The Notch signaling pathway is involved in cell fate decision and developmental patterning in diverse organisms. A receptor molecule, Notch (N), and a ligand molecule (in this case Delta or Dl) are the central molecules in this pathway. In early Drosophila embryos, these molecules determine neural vs. skin fates in a reproducible rosette pattern. RESULTS We have created an agent-based model (ABM) that simulates the molecular components for this signaling pathway as agents acting within a spatial representation of a cell. The model captures the changing levels of these components, their transition from one state to another, and their movement from the nucleus to the cell membrane and back to the nucleus again. The model introduces stochastic variation into the system using a random generator within the Netlogo programming environment. The model uses these representations to understand the biological systems at three levels: individual cell fate, the interactions between cells, and the formation of pattern across the system. Using a set of assessment tools, we show that the current model accurately reproduces the rosette pattern of neurons and skin cells in the system over a wide set of parameters. Oscillations in the level of the N agent eventually stabilize cell fate into this pattern. We found that the dynamic timing and the availability of the N and Dl agents in neighboring cells are central to the formation of a correct and stable pattern. A feedback loop to the production of both components is necessary for a correct and stable pattern. CONCLUSIONS The signaling pathways within and between cells in our model interact in real time to create a spatially correct field of neurons and skin cells. This model predicts that cells with high N and low Dl drive the formation of the pattern. This model also be used to elucidate general rules of biological self-patterning and decision-making.
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Affiliation(s)
- Elaine R. Reynolds
- Biology Department, Lafayette College, Easton, PA 18042 USA
- Neuroscience Program, Lafayette College, Easton, PA 18042 USA
| | - Ryan Himmelwright
- Neuroscience Program, Lafayette College, Easton, PA 18042 USA
- Present address: 530 Foster Street, Apt #512, Durham, NC 27701 USA
| | - Christopher Sanginiti
- Neuroscience Program, Lafayette College, Easton, PA 18042 USA
- Present address: 780 Richie Hwy, Suite S-30, Severna Park, MD 21146 USA
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6
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Scavuzzo MA, Chmielowiec J, Yang D, Wamble K, Chaboub LS, Duraine L, Tepe B, Glasgow SM, Arenkiel BR, Brou C, Deneen B, Borowiak M. Pancreatic Cell Fate Determination Relies on Notch Ligand Trafficking by NFIA. Cell Rep 2018; 25:3811-3827.e7. [PMID: 30590051 DOI: 10.1016/j.celrep.2018.11.078] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 09/28/2018] [Accepted: 11/20/2018] [Indexed: 12/24/2022] Open
Abstract
Notch is activated globally in pancreatic progenitors; however, for progenitors to differentiate into endocrine cells, they must escape Notch activation to express Neurogenin-3. Here, we find that the transcription factor nuclear factor I/A (NFIA) promotes endocrine development by regulating Notch ligand Dll1 trafficking. Pancreatic deletion of NFIA leads to cell fate defects, with increased duct and decreased endocrine formation, while ectopic expression promotes endocrine formation in mice and human pancreatic progenitors. NFIA-deficient mice exhibit dysregulation of trafficking-related genes including increased expression of Mib1, which acts to target Dll1 for endocytosis. We find that NFIA binds to the Mib1 promoter, with loss of NFIA leading to an increase in Dll1 internalization and enhanced Notch activation with rescue of the cell fate defects after Mib1 knockdown. This study reveals NFIA as a pro-endocrine factor in the pancreas, acting to repress Mib1, inhibit Dll1 endocytosis and thus promote escape from Notch activation.
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Affiliation(s)
- Marissa A Scavuzzo
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jolanta Chmielowiec
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital, and Houston Methodist Hospital, Houston, TX 77030, USA; Stem Cell and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Diane Yang
- Molecular and Cellular Biology Department, Baylor College of Medicine, Houston, TX 77030, USA
| | - Katrina Wamble
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital, and Houston Methodist Hospital, Houston, TX 77030, USA; Stem Cell and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Lesley S Chaboub
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Lita Duraine
- Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA
| | - Burak Tepe
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Stacey M Glasgow
- Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital, and Houston Methodist Hospital, Houston, TX 77030, USA; Stem Cell and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Benjamin R Arenkiel
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA; McNair Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Christel Brou
- Department of Cell Biology and Infection, Institute Pasteur, 25 rue du Docteur Roux, 75724 Paris Cedex 15, France
| | - Benjamin Deneen
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA; Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital, and Houston Methodist Hospital, Houston, TX 77030, USA; Stem Cell and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA
| | - Malgorzata Borowiak
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA; Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital, and Houston Methodist Hospital, Houston, TX 77030, USA; Stem Cell and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX 77030, USA; Molecular and Cellular Biology Department, Baylor College of Medicine, Houston, TX 77030, USA; Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030, USA; McNair Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA.
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7
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Mollen EWJ, Ient J, Tjan-Heijnen VCG, Boersma LJ, Miele L, Smidt ML, Vooijs MAGG. Moving Breast Cancer Therapy up a Notch. Front Oncol 2018; 8:518. [PMID: 30515368 PMCID: PMC6256059 DOI: 10.3389/fonc.2018.00518] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 10/22/2018] [Indexed: 12/11/2022] Open
Abstract
Breast cancer is the second most common malignancy, worldwide. Treatment decisions are based on tumor stage, histological subtype, and receptor expression and include combinations of surgery, radiotherapy, and systemic treatment. These, together with earlier diagnosis, have resulted in increased survival. However, initial treatment efficacy cannot be guaranteed upfront, and these treatments may come with (long-term) serious adverse effects, negatively affecting a patient's quality of life. Gene expression-based tests can accurately estimate the risk of recurrence in early stage breast cancers. Disease recurrence correlates with treatment resistance, creating a major need to resensitize tumors to treatment. Notch signaling is frequently deregulated in cancer and is involved in treatment resistance. Preclinical research has already identified many combinatory therapeutic options where Notch involvement enhances the effectiveness of radiotherapy, chemotherapy or targeted therapies for breast cancer. However, the benefit of targeting Notch has remained clinically inconclusive. In this review, we summarize the current knowledge on targeting the Notch pathway to enhance current treatments for breast cancer and to combat treatment resistance. Furthermore, we propose mechanisms to further exploit Notch-based therapeutics in the treatment of breast cancer.
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Affiliation(s)
- Erik W J Mollen
- Department of Radiotherapy, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, Netherlands.,Department of Radiation Oncology (MAASTRO), Maastricht University Medical Centre+, Maastricht, Netherlands.,Division of Medical Oncology, Department of Surgery, Maastricht University Medical Centre+, Maastricht, Netherlands
| | - Jonathan Ient
- Department of Radiotherapy, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, Netherlands
| | - Vivianne C G Tjan-Heijnen
- Department of Radiotherapy, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, Netherlands.,Division of Medical Oncology, Department of Internal Medicine, Maastricht University Medical Centre+, Maastricht, Netherlands
| | - Liesbeth J Boersma
- Department of Radiotherapy, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, Netherlands.,Department of Radiation Oncology (MAASTRO), Maastricht University Medical Centre+, Maastricht, Netherlands
| | - Lucio Miele
- Department of Genetics, Louisiana State University Health Sciences Center, New Orleans, LA, United States.,Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Marjolein L Smidt
- Department of Radiotherapy, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, Netherlands.,Division of Medical Oncology, Department of Surgery, Maastricht University Medical Centre+, Maastricht, Netherlands
| | - Marc A G G Vooijs
- Department of Radiotherapy, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, Netherlands.,Department of Radiation Oncology (MAASTRO), Maastricht University Medical Centre+, Maastricht, Netherlands
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8
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Boccalini G, Sassoli C, Bani D, Nistri S. Relaxin induces up-regulation of ADAM10 metalloprotease in RXFP1-expressing cells by PI3K/AKT signaling. Mol Cell Endocrinol 2018; 472:80-86. [PMID: 29180109 DOI: 10.1016/j.mce.2017.11.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 10/16/2017] [Accepted: 11/23/2017] [Indexed: 12/24/2022]
Abstract
ADAM10 metalloprotease is required for activation of Notch-1, a transmembrane receptor regulating cell differentiation, proliferation and apoptosis, whose intracellular proteolytic fragment NICD mediates some key cardiovascular effects of the hormone relaxin (RLX). This study demonstrates the involvement of ADAM10 and PI3K/Akt signaling in mediating RLX-induced Notch-1 activation. H9c2 cardiomyocytes and NIH3T3 fibroblasts were incubated with human RLX-2 (17 nmol/l, 24 h) in presence or absence of the PI3K or Akt inhibitors wortmannin (WT, 100 nmol/l) and triciribine (TCN, 1 μmol/l). Cyclohexanedione-inactivated RLX (iRLX) served as negative control. RLX significantly increased Akt phosphorylation, ADAM10 and NICD expression, which were abolished by WT or TCN and did not occur with iRLX. These findings highlight a new receptor-specific signal transduction pathway of RLX.
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Affiliation(s)
- Giulia Boccalini
- Research Unit of Histology & Embryology, Dept. Experimental & Clinical Medicine, University of Florence, Viale G.Pieraccini 6, 50139 Florence, Italy
| | - Chiara Sassoli
- Section of Anatomy & Histology, Dept. Experimental & Clinical Medicine, University of Florence, Largo Brambilla 3, 50134 Florence, Italy
| | - Daniele Bani
- Research Unit of Histology & Embryology, Dept. Experimental & Clinical Medicine, University of Florence, Viale G.Pieraccini 6, 50139 Florence, Italy
| | - Silvia Nistri
- Research Unit of Histology & Embryology, Dept. Experimental & Clinical Medicine, University of Florence, Viale G.Pieraccini 6, 50139 Florence, Italy.
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9
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Luo X, Jiang Y, Bi R, Jiang N, Zhu S. Inhibition of notch signaling pathway temporally postpones the cartilage degradation progress of temporomandibular joint arthritis in mice. J Craniomaxillofac Surg 2018; 46:1132-1138. [PMID: 29779621 DOI: 10.1016/j.jcms.2018.04.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/26/2018] [Accepted: 04/25/2018] [Indexed: 02/05/2023] Open
Abstract
PURPOSE The aim of this study is to explore the role of Notch signaling pathway in the initiation and progression of temporomandibular joint osteoarthritis (TMJOA). METHODS 48 mice were divided into DAPT-TMJOA, Control-TMJOA and Control-Sham groups. Animals received discectomy/Sham surgery in their right TMJ, following the DAPT/saline intra-articular injections every week. Mice were sacrificed at 1/4/8 weeks post-surgery. Safranin-O and H&E staining were performed on the TMJ sections for the modified Mankin's score. qPCR and immunohistochemistry were used to evaluate Notch1, Jagged1 and Hes5 expressions. RESULTS The mRNA expressions of Notch1, Jagged1 and Hes5 were significantly increased in Control-TMJOA group compared with Control-Sham group. Immunostaining revealed a dramatic elevation of Notch1, Jagged1 and Hes5 signals distributed in the cartilage at 1 and 4 weeks after discectomy. However, the increased number of those immuno-positive cells turned down at 8 weeks after surgery. DAPT treatment partially rescued the elevated mRNA expression and immuno-positive cell numbers of Notch1, Jagged1 and Hes5. More importantly, the cartilage destruction during TMJOA was delayed by DAPT treatment, analyzed by modified Mankin's score. CONCLUSION Notch signaling participates in the onset and development of TMJOA. Inhibiting Notch signaling activation by DAPT can partially delay the progress of TMJOA.
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Affiliation(s)
- Xueting Luo
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yangmei Jiang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Ruiye Bi
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Nan Jiang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Songsong Zhu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
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10
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Lan L, Jiang Y, Zhang W, Li T, Ying B, Zhu S. Expression of Notch signaling pathway during osteoarthritis in the temporomandibular joint. J Craniomaxillofac Surg 2017; 45:1338-1348. [PMID: 28684076 DOI: 10.1016/j.jcms.2017.05.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/28/2017] [Accepted: 05/29/2017] [Indexed: 02/05/2023] Open
Abstract
PURPOSE Our study aim was to characterize the expression of Notch molecules during temporomandibular joint osteoarthritis (TMJOA), thus exploring the mechanism and roles that Notch signaling possibly plays in the initiation and progression of TMJOA. MATERIALS AND METHODS A total of 126 mice were divided randomly into experimental groups, a sham-surgery group and a normal control group. In the experimental group, total discectomy was performed in the right temporomandibular joint (TMJ) to induce TMJOA; the sham-operation group underwent the same procedure without disc removal, and the normal control group was left undisturbed. Fourteen mice in each group were sacrificed in batches respectively at 1, 2, and 4 weeks postoperatively. Histology was performed to examine TMJOA in eight condyles each group, and a modified Mankin scoring system was used for evaluation. Immunohistochemistry was carried out to characterize the expression of the Notch markers Notch1, Jagged1, Hes1, and Hes5. Real-time polymerase chain reaction (RT-PCR) was performed for further detection and analysis of Notch markers in six condyles in each group. RESULTS Notch1, Jagged1, and Hes5 were activated in the experimental group, with expression levels that increased dramatically over time, whereas the control group showed no fluctuation. Hes1 expression was suppressed at the beginning but was up-regulated afterward. CONCLUSIONS Our data suggest that Notch signaling is activated in TMJOA with a much more abundant expression in osteoarthritis cartilage.
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Affiliation(s)
- Lingli Lan
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Yangmei Jiang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Weina Zhang
- Department of Stomatology, Ningbo First Hospital, Ningbo 315000, China
| | - Ting Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Binbin Ying
- Department of Stomatology, Ningbo First Hospital, Ningbo 315000, China
| | - Songsong Zhu
- Centre of Orthognathic and TMJ Surgery, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
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11
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Zhou W, He Q, Zhang C, He X, Cui Z, Liu F, Li W. BLOS2 negatively regulates Notch signaling during neural and hematopoietic stem and progenitor cell development. eLife 2016; 5. [PMID: 27719760 PMCID: PMC5094856 DOI: 10.7554/elife.18108] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 10/04/2016] [Indexed: 12/28/2022] Open
Abstract
Notch signaling plays a crucial role in controling the proliferation and differentiation of stem and progenitor cells during embryogenesis or organogenesis, but its regulation is incompletely understood. BLOS2, encoded by the Bloc1s2 gene, is a shared subunit of two lysosomal trafficking complexes, biogenesis of lysosome-related organelles complex-1 (BLOC-1) and BLOC-1-related complex (BORC). Bloc1s2-/- mice were embryonic lethal and exhibited defects in cortical development and hematopoiesis. Loss of BLOS2 resulted in elevated Notch signaling, which consequently increased the proliferation of neural progenitor cells and inhibited neuronal differentiation in cortices. Likewise, ablation of bloc1s2 in zebrafish or mice led to increased hematopoietic stem and progenitor cell production in the aorta-gonad-mesonephros region. BLOS2 physically interacted with Notch1 in endo-lysosomal trafficking of Notch1. Our findings suggest that BLOS2 is a novel negative player in regulating Notch signaling through lysosomal trafficking to control multiple stem and progenitor cell homeostasis in vertebrates.
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Affiliation(s)
- Wenwen Zhou
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Qiuping He
- University of Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Chunxia Zhang
- University of Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Xin He
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Zongbin Cui
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Beijing, China
| | - Feng Liu
- University of Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Wei Li
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.,Center for Medical Genetics, Beijing Children's Hospital, Capital Medical University, Beijing, China.,Center of Alzheimer's Disease, Beijing Institute for Brain Disorders, Beijing, China.,MOE Key Laboratory of Major Diseases in Children, Beijing, China.,Beijing Pediatric Research Institute, Beijing, China
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12
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Liu J, Shen JX, Wen XF, Guo YX, Zhang GJ. Targeting Notch degradation system provides promise for breast cancer therapeutics. Crit Rev Oncol Hematol 2016; 104:21-9. [PMID: 27263934 DOI: 10.1016/j.critrevonc.2016.05.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 04/18/2016] [Accepted: 05/19/2016] [Indexed: 02/05/2023] Open
Abstract
Notch receptor signaling pathways play an important role, not only in normal breast development but also in breast cancer development and progression. As a group of ligand-induced proteins, different subtypes of mammalian Notch (Notch1-4) are sensitive to subtle changes in protein levels. Thus, a clear understanding of mechanisms of Notch protein turnover is essential for understanding normal and pathological mechanisms of Notch functions. It has been suggested that there is a close relationship between the carcinogenesis and the dysregulation of Notch degradation. However, this relationship remains mostly undefined in the context of breast cancer, as protein degradation is mediated by numerous signaling pathways as well as certain molecule modulators (activators/inhibitors). In this review, we summarize the published data regarding the regulation of Notch family member degradation in breast cancer, while emphasizing areas that are likely to provide new therapeutic modalities for mechanism-based anti-cancer drugs.
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Affiliation(s)
- Jing Liu
- Chang Jiang Scholar's Laboratory, Shantou University Medical College, Shantou, Guangdong Province, PR China; Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Breast Cancer, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China.
| | - Jia-Xin Shen
- Chang Jiang Scholar's Laboratory, Shantou University Medical College, Shantou, Guangdong Province, PR China; Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Breast Cancer, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China; The Breast Center, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China.
| | - Xiao-Fen Wen
- Chang Jiang Scholar's Laboratory, Shantou University Medical College, Shantou, Guangdong Province, PR China; Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Breast Cancer, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China; The Breast Center, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China.
| | - Yu-Xian Guo
- Chang Jiang Scholar's Laboratory, Shantou University Medical College, Shantou, Guangdong Province, PR China; Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Breast Cancer, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China; The Breast Center, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China.
| | - Guo-Jun Zhang
- Chang Jiang Scholar's Laboratory, Shantou University Medical College, Shantou, Guangdong Province, PR China; Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Breast Cancer, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China; The Breast Center, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong Province, PR China.
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13
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Sturgeon M, Davis D, Albers A, Beatty D, Austin R, Ferguson M, Tounsel B, Liebl FLW. The Notch ligand E3 ligase, Mind Bomb1, regulates glutamate receptor localization in Drosophila. Mol Cell Neurosci 2015; 70:11-21. [PMID: 26596173 DOI: 10.1016/j.mcn.2015.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 11/09/2015] [Accepted: 11/16/2015] [Indexed: 12/29/2022] Open
Abstract
The postsynaptic density (PSD) is a protein-rich network important for the localization of postsynaptic glutamate receptors (GluRs) and for signaling downstream of these receptors. Although hundreds of PSD proteins have been identified, many are functionally uncharacterized. We conducted a reverse genetic screen for mutations that affected GluR localization using Drosophila genes that encode homologs of mammalian PSD proteins. 42.8% of the mutants analyzed exhibited a significant change in GluR localization at the third instar larval neuromuscular junction (NMJ), a model synapse that expresses homologs of AMPA receptors. We identified the E3 ubiquitin ligase, Mib1, which promotes Notch signaling, as a regulator of synaptic GluR localization. Mib1 positively regulates the localization of the GluR subunits GluRIIA, GluRIIB, and GluRIIC. Mutations in mib1 and ubiquitous expression of Mib1 that lacks its ubiquitin ligase activity result in the loss of synaptic GluRIIA-containing receptors. In contrast, overexpression of Mib1 in all tissues increases postsynaptic levels of GluRIIA. Cellular levels of Mib1 are also important for the structure of the presynaptic motor neuron. While deficient Mib1 signaling leads to overgrowth of the NMJ, ubiquitous overexpression of Mib1 results in a reduction in the number of presynaptic motor neuron boutons and branches. These synaptic changes may be secondary to attenuated glutamate release from the presynaptic motor neuron in mib1 mutants as mib1 mutants exhibit significant reductions in the vesicle-associated protein cysteine string protein and in the frequency of spontaneous neurotransmission.
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Affiliation(s)
- Morgan Sturgeon
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Dustin Davis
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Amanda Albers
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Derek Beatty
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Rik Austin
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Matt Ferguson
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Brittany Tounsel
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Faith L W Liebl
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States.
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14
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Vinson KE, George DC, Fender AW, Bertrand FE, Sigounas G. The Notch pathway in colorectal cancer. Int J Cancer 2015; 138:1835-42. [PMID: 26264352 DOI: 10.1002/ijc.29800] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 07/23/2015] [Accepted: 07/28/2015] [Indexed: 12/19/2022]
Abstract
Colorectal cancer (CRC) is the third leading cause of cancer death worldwide. It is also the third most common cancer diagnosis among men, and the second most common cancer diagnosis among women. Globally, CRC can account for nearly 694,000 annual deaths. It is widely appreciated that CRC is the result of dysregulated cellular pathways that promote an inappropriate stem-cell-like phenotype, apoptotic resistance, unchecked proliferation and metastatic spread. While no single pathway is responsible for all of these attributes, an array of recent studies suggests a pivotal role for abnormal Notch-1 signaling in CRC, in part due to interconnectivity of Notch with other pathways. This review will summarize recent evidence for a role of Notch signaling in CRC, will consider interconnectivity between Notch and other pathways involved in CRC and will discuss the possible utility of targeting Notch as a CRC therapeutic.
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Affiliation(s)
- Kaitlyn E Vinson
- Department of Internal Medicine, Brody School of Medicine, East Carolina University, Greenville, NC
| | - Dennis C George
- Department of Internal Medicine, Brody School of Medicine, East Carolina University, Greenville, NC
| | - Alexander W Fender
- Department of Internal Medicine, Brody School of Medicine, East Carolina University, Greenville, NC
| | - Fred E Bertrand
- Department of Clinical and Diagnostic Sciences, School of Health Professions, University of Alabama at Birmingham, Birmingham, AL.,Department of Nutrition Sciences, School of Health Professions, University of Alabama at Birmingham, Birmingham, AL
| | - George Sigounas
- Department of Internal Medicine, Brody School of Medicine, East Carolina University, Greenville, NC
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15
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Gomez-Lamarca MJ, Snowdon LA, Seib E, Klein T, Bray SJ. Rme-8 depletion perturbs Notch recycling and predisposes to pathogenic signaling. J Cell Biol 2015; 210:303-18. [PMID: 26169355 PMCID: PMC4508892 DOI: 10.1083/jcb.201411001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 06/11/2015] [Indexed: 02/07/2023] Open
Abstract
The retromer-associated DNAJ protein Rme-8 is necessary for normal Notch recycling, and reductions in Rme-8 sensitize cells so that additional loss-of-sorting retromer or ESCRT-0 components have catastrophic effects. Notch signaling is a major regulator of cell fate, proliferation, and differentiation. Like other signaling pathways, its activity is strongly influenced by intracellular trafficking. Besides contributing to signal activation and down-regulation, differential fluxes between trafficking routes can cause aberrant Notch pathway activation. Investigating the function of the retromer-associated DNAJ protein Rme-8 in vivo, we demonstrate a critical role in regulating Notch receptor recycling. In the absence of Rme-8, Notch accumulated in enlarged tubulated Rab4-positive endosomes, and as a consequence, signaling was compromised. Strikingly, when the retromer component Vps26 was depleted at the same time, Notch no longer accumulated and instead was ectopically activated. Likewise, depletion of ESCRT-0 components Hrs or Stam in combination with Rme-8 also led to high levels of ectopic Notch activity. Together, these results highlight the importance of Rme-8 in coordinating normal endocytic recycling route and reveal that its absence predisposes toward conditions in which pathological Notch signaling can occur.
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Affiliation(s)
- Maria J Gomez-Lamarca
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, England, UK
| | - Laura A Snowdon
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, England, UK
| | - Ekatarina Seib
- Institute of Genetics, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Thomas Klein
- Institute of Genetics, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Sarah J Bray
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, England, UK
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16
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Chou MH, Hsieh YC, Huang CW, Chen PH, Chan SP, Tsao YP, Lee HH, Wu JT, Chen SL. BCAS2 Regulates Delta-Notch Signaling Activity through Delta Pre-mRNA Splicing in Drosophila Wing Development. PLoS One 2015; 10:e0130706. [PMID: 26091239 PMCID: PMC4475048 DOI: 10.1371/journal.pone.0130706] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 05/23/2015] [Indexed: 11/19/2022] Open
Abstract
Previously, we showed that BCAS2 is essential for Drosophila viability and functions in pre-mRNA splicing. In this study, we provide strong evidence that BCAS2 regulates the activity of Delta-Notch signaling via Delta pre-mRNA splicing. Depletion of dBCAS2 reduces Delta mRNA expression and leads to accumulation of Delta pre-mRNA, resulting in diminished transcriptions of Delta-Notch signaling target genes, such as cut and E(spl)m8. Furthermore, ectopic expression of human BCAS2 (hBCAS2) and Drosophila BCAS2 (dBCAS2) in a dBCAS2-deprived fly can rescue dBCAS2 depletion-induced wing damage to the normal phenotypes. These rescued phenotypes are correlated with the restoration of Delta pre-mRNA splicing, which affects Delta-Notch signaling activity. Additionally, overexpression of Delta can rescue the wing deformation by deprivation of dBCAS2; and the depletion of dBCAS2 can restore the aberrant eye associated with Delta-overexpressing retinas; providing supporting evidence for the regulation of Delta-Notch signaling by dBCAS2. Taken together, dBCAS2 participates in Delta pre-mRNA splicing that affects the regulation of Delta-Notch signaling in Drosophila wing development.
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Affiliation(s)
- Meng-Hsuan Chou
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Yi-Chen Hsieh
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Chu-Wei Huang
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Po-Han Chen
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Shih-Peng Chan
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Yeou-Ping Tsao
- Department of Ophthalmology, Mackay Memorial Hospital, Taipei, 104, Taiwan
| | - Hsiu-Hsiang Lee
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - June-Tai Wu
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
- Department of Medical Research, National Taiwan University Hospital, Taipei, 100, Taiwan
- * E-mail: (SLC); (JTW)
| | - Show-Li Chen
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
- * E-mail: (SLC); (JTW)
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17
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Boccalini G, Sassoli C, Formigli L, Bani D, Nistri S. Relaxin protects cardiac muscle cells from hypoxia/reoxygenation injury: involvement of the Notch-1 pathway. FASEB J 2014; 29:239-49. [PMID: 25342127 DOI: 10.1096/fj.14-254854] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In animal models, the cardiotropic hormone relaxin has been shown to protect the heart against ischemia and reperfusion-induced damage, acting by multiple mechanisms that primarily involve the coronary vessels. This in vitro study evaluates whether relaxin also has a direct protective action on cardiac muscle cells. H9c2 rat cardiomyoblasts and primary mouse cardiomyocytes were subjected to hypoxia and reoxygenation. In some experiments, relaxin was added preventatively before hypoxia; in others, at reoxygenation. To elucidate its mechanisms of action, we focused on Notch-1, which is involved in heart pre- and postconditioning to ischemia. Inactivated RLX was used as negative control. Relaxin (17 nmol/L, EC50 4.7 nmol/L), added 24 h before hypoxia or at reoxygenation, protected against cardiomyocyte injury. In fact, relaxin significantly increased cell viability (assayed by trypan blue and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide), decreased apoptosis (assayed by TUNEL and bax/bcl-2 ratio), and reduced nitroxidative damage (assayed by nitrotyrosine expression and 8-hydroxy-deoxyguanosine levels). These effects were partly attributable to the ability of relaxin to upregulate Notch-1 signaling; indeed, blockade of Notch-1 activation with the specific inhibitor DAPT reduced relaxin-induced cardioprotection during hypoxia and reoxygenation. This study adds new mechanistic insights on the cardioprotective role of relaxin on ischemic and oxidative damage.
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Affiliation(s)
- Giulia Boccalini
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Research Unit of Histology and Embryology, University of Florence, Florence, Italy
| | - Chiara Sassoli
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Research Unit of Histology and Embryology, University of Florence, Florence, Italy
| | - Lucia Formigli
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Research Unit of Histology and Embryology, University of Florence, Florence, Italy
| | - Daniele Bani
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Research Unit of Histology and Embryology, University of Florence, Florence, Italy
| | - Silvia Nistri
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Research Unit of Histology and Embryology, University of Florence, Florence, Italy
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18
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Belle VA, McDermott N, Meunier A, Marignol L. NUMB inhibition of NOTCH signalling as a therapeutic target in prostate cancer. Nat Rev Urol 2014; 11:499-507. [PMID: 25134838 PMCID: PMC5240474 DOI: 10.1038/nrurol.2014.195] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Prostate cancer is among the most prevalent life-threatening cancers diagnosed in the male population today. Various methods have been exploited in an attempt to treat this disease but these treatments, alongside preventative tactics, have been insufficient to control mortality rates and have usually resulted in detrimental adverse events. An opportunity to devise more-specific and potentially more-effective approaches for the eradication of prostate tumours can be found by targeting specific biological pathways. NUMB (protein numb homologue), a key regulator of cell fate, represents an attractive, actionable target in prostate cancer. NUMB participates in the observed deregulation of NOTCH (neurogenic locus notch homologue protein) signalling in prostate tumours, and the NUMB-NOTCH interaction regulates cell fate. NUMB has potential both as a target for control of prostate tumorigenesis and as a biomarker for identification of patients with prostate cancer who are likely to benefit from NOTCH inhibition.
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Affiliation(s)
| | - Niamh McDermott
- Radiation and Urologic Oncology, Applied Radiation Therapy Trinity and Prostate Molecular Oncology Research Group, Trinity College Dublin, Trinity Centre for Health Sciences, James's Street, Dublin 8, Ireland
| | - Armelle Meunier
- Radiation and Urologic Oncology, Applied Radiation Therapy Trinity and Prostate Molecular Oncology Research Group, Trinity College Dublin, Trinity Centre for Health Sciences, James's Street, Dublin 8, Ireland
| | - Laure Marignol
- Radiation and Urologic Oncology, Applied Radiation Therapy Trinity and Prostate Molecular Oncology Research Group, Trinity College Dublin, Trinity Centre for Health Sciences, James's Street, Dublin 8, Ireland
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19
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Zacharioudaki E, Bray SJ. Tools and methods for studying Notch signaling in Drosophila melanogaster. Methods 2014; 68:173-82. [PMID: 24704358 PMCID: PMC4059942 DOI: 10.1016/j.ymeth.2014.03.029] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 03/23/2014] [Accepted: 03/25/2014] [Indexed: 01/08/2023] Open
Abstract
Notch signaling involves a highly conserved pathway that mediates communication between neighboring cells. Activation of Notch by its ligands, results in the release of the Notch intracellular domain (NICD), which enters the nucleus and regulates transcription. This pathway has been implicated in many developmental decisions and diseases (including cancers) over the past decades. The simplicity of the Notch pathway in Drosophila melanogaster, in combination with the availability of powerful genetics, make this an attractive model for studying fundamental principles of Notch regulation and function. In this article we present some of the established and emerging tools that are available to monitor and manipulate the Notch pathway in Drosophila and discuss their strengths and weaknesses.
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Affiliation(s)
- Evanthia Zacharioudaki
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Sarah J Bray
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK.
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20
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Smolarkiewicz M, Skrzypczak T, Wojtaszek P. The very many faces of presenilins and the γ-secretase complex. PROTOPLASMA 2013; 250:997-1011. [PMID: 23504135 PMCID: PMC3788181 DOI: 10.1007/s00709-013-0494-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Accepted: 03/01/2013] [Indexed: 05/02/2023]
Abstract
Presenilin is a central, catalytic component of the γ-secretase complex which conducts intramembrane cleavage of various protein substrates. Although identified and mainly studied through its role in the development of amyloid plaques in Alzheimer disease, γ-secretase has many other important functions. The complex seems to be evolutionary conserved throughout the Metazoa, but recent findings in plants and Dictyostelium discoideum as well as in archeons suggest that its evolution and functions might be much more diversified than previously expected. In this review, a selective survey of the multitude of functions of presenilins and the γ-secretase complex is presented. Following a brief overview of γ-secretase structure, assembly and maturation, three functional aspects are analyzed: (1) the role of γ-secretase in autophagy and phagocytosis; (2) involvement of the complex in signaling related to endocytosis; and (3) control of calcium fluxes by presenilins.
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Affiliation(s)
- Michalina Smolarkiewicz
- Department of Molecular and Cellular Biology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
| | - Tomasz Skrzypczak
- Department of Molecular and Cellular Biology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
| | - Przemysław Wojtaszek
- Department of Molecular and Cellular Biology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
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21
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Heuss SF, Tarantino N, Fantini J, Ndiaye-Lobry D, Moretti J, Israël A, Logeat F. A glycosphingolipid binding domain controls trafficking and activity of the mammalian notch ligand delta-like 1. PLoS One 2013; 8:e74392. [PMID: 24069306 PMCID: PMC3771905 DOI: 10.1371/journal.pone.0074392] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 08/01/2013] [Indexed: 01/12/2023] Open
Abstract
The activity of Notch ligands is tightly regulated by trafficking events occurring both before and after ligand-receptor interaction. In particular endocytosis and recycling have been shown to be required for full signaling activity of the ligands before they encounter the Notch receptor. However little is known about the precise endocytic processes that contribute to ligand internalization. Here we demonstrate that endocytosis contributes to Dll1 signaling activity by preserving the ligand from shedding and degradation. We further show that the glycosphingolipid-binding motif originally identified in Drosophila Notch ligands is conserved in mammals and is necessary for Dll1 internalization. Mutation of its conserved tryptophan residue results in a Dll1 molecule which is rapidly inactivated by shedding and degradation, does not recycle to the cell surface and does not activate Notch signaling. Finally, silencing in the signal-sending cells of glucosylceramide synthase, the enzyme implicated in the initial phase of glycosphingolipid synthesis, down-regulates Notch activation. Our data indicate that glycosphingolipids, by interacting with Dll1, may act as functional co-factors to promote its biological activity.
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Affiliation(s)
- Sara Farrah Heuss
- Unité de Signalisation Moléculaire et Activation Cellulaire, URA CNRS 2582, Institut Pasteur, Paris, France
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22
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Puca L, Chastagner P, Meas-Yedid V, Israël A, Brou C. Α-arrestin 1 (ARRDC1) and β-arrestins cooperate to mediate Notch degradation in mammals. J Cell Sci 2013; 126:4457-68. [PMID: 23886940 DOI: 10.1242/jcs.130500] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Notch signaling is a conserved signaling pathway implicated in embryogenesis and adult tissue maintenance. Notch signaling strength is strictly regulated, notably by maintaining a controlled pool of functional receptor at the cell surface. Mammalian non-activated Notch receptor is internalized, ubiquitylated by the Itch E3 ubiquitin ligase and degraded in the lysosomes. Here, we show that β-arrestins are necessary for Itch-Notch interaction and for Itch-driven ubiquitylation and degradation of Notch. Interestingly, β-arrestins do not directly bind Itch but heterodimerize with a member of another subfamily of arrestins called ARRDC1 or α-arrestin 1, which harbors PPxY motifs that allow direct interaction with Itch. Cells transfected with ARRDC1 mutated in PPxY motifs show reduced Itch-mediated Notch ubiquitylation and impaired lysosomal degradation of Notch, as observed in β-arrestin(-/-) or Itch(-/-) cells. Our data show for the first time that ARRDC1 and β-arrestins heterodimerize and cooperate in the same complex to promote non-activated Notch receptor degradation, thus acting as negative regulators of Notch signaling.
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Affiliation(s)
- Loredana Puca
- Institut Pasteur and CNRS URA 2582, Signalisation Moléculaire et Activation Cellulaire, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France
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23
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Ubiquitinations in the notch signaling pathway. Int J Mol Sci 2013; 14:6359-81. [PMID: 23519106 PMCID: PMC3634445 DOI: 10.3390/ijms14036359] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/11/2013] [Accepted: 03/14/2013] [Indexed: 12/22/2022] Open
Abstract
The very conserved Notch pathway is used iteratively during development and adulthood to regulate cell fates. Notch activation relies on interactions between neighboring cells, through the binding of Notch receptors to their ligands, both transmembrane molecules. This inter-cellular contact initiates a cascade of events eventually transforming the cell surface receptor into a nuclear factor acting on the transcription of specific target genes. This review highlights how the various processes undergone by Notch receptors and ligands that regulate the pathway are linked to ubiquitination events.
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24
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Ntelios D, Berninger B, Tzimagiorgis G. Numb and Alzheimer's disease: the current picture. Front Neurosci 2012; 6:145. [PMID: 23060745 PMCID: PMC3463830 DOI: 10.3389/fnins.2012.00145] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 09/14/2012] [Indexed: 11/23/2022] Open
Abstract
Twenty-three years ago, numb was identified as a critical regulator in Drosophila sensory organ precursor cell asymmetric divisions. Beyond the recently recognized role in carcinogenesis, Numb seems to be important in Alzheimer’s disease. This assertion comes from the involvement in various processes such as synapse morphogenesis, amyloid precursor protein trafficking, notch signaling, and neurogenesis. The purpose of the present mini-review is to provide the current picture of Numb’s participation in mechanisms underlying Alzheimer’s disease pathogenesis and emphasize potential aspects for future research.
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Affiliation(s)
- Dimitrios Ntelios
- Laboratory of Biological Chemistry, Medical School, Aristotle University of Thessaloniki Thessaloniki, Greece
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25
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Perdigoto CN, Bardin AJ. Sending the right signal: Notch and stem cells. Biochim Biophys Acta Gen Subj 2012; 1830:2307-22. [PMID: 22917651 DOI: 10.1016/j.bbagen.2012.08.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 07/13/2012] [Accepted: 08/07/2012] [Indexed: 12/16/2022]
Abstract
BACKGROUND Notch signaling plays a critical role in multiple developmental programs and not surprisingly, the Notch pathway has also been implicated in the regulation of many adult stem cells, such as those in the intestine, skin, lungs, hematopoietic system, and muscle. SCOPE OF REVIEW In this review, we will first describe molecular mechanisms of Notch component modulation including recent advances in this field and introduce the fundamental principles of Notch signaling controlling cell fate decisions. We will then illustrate its important and varied functions in major stem cell model systems including: Drosophila and mammalian intestinal stem cells and mammalian skin, lung, hematopoietic and muscle stem cells. MAJOR CONCLUSIONS The Notch receptor and its ligands are controlled by endocytic processes that regulate activation, turnover, and recycling. Glycosylation of the Notch extracellular domain has important modulatory functions on interactions with ligands and on proper receptor activity. Notch can mediate cell fate decisions including proliferation, lineage commitment, and terminal differentiation in many adult stem cell types. Certain cell fate decisions can have precise requirements for levels of Notch signaling controlled through modulatory regulation. GENERAL SIGNIFICANCE We describe the current state of knowledge of how the Notch receptor is controlled through its interaction with ligands and how this is regulated by associated factors. The functional consequences of Notch receptor activation on cell fate decisions are discussed. We illustrate the importance of Notch's role in cell fate decisions in adult stem cells using examples from the intestine, skin, lung, blood, and muscle. This article is part of a Special Issue entitled Biochemistry of Stem Cells.
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Moretti J, Chastagner P, Liang CC, Cohn MA, Israël A, Brou C. The ubiquitin-specific protease 12 (USP12) is a negative regulator of notch signaling acting on notch receptor trafficking toward degradation. J Biol Chem 2012; 287:29429-41. [PMID: 22778262 DOI: 10.1074/jbc.m112.366807] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Notch signaling is critical for development and adult tissue physiology, controlling cell fate in a context-dependent manner. Upon ligand binding, the transmembrane Notch receptor undergoes two ordered proteolytic cleavages releasing Notch intracellular domain, which regulates the transcription of Notch target genes. The strength of Notch signaling is of crucial importance and depends notably on the quantity of Notch receptor at the cell surface. Using an shRNA library screen monitoring Notch trafficking and degradation in the absence of ligand, we identified mammalian USP12 and its Drosophila melanogaster homolog as novel negative regulators of Notch signaling. USP12 silencing specifically interrupts Notch trafficking to the lysosomes and, as a consequence, leads to an increased amount of receptor at the cell surface and to a higher Notch activity. At the biochemical level, USP12 with its activator UAF1 deubiquitinate the nonactivated form of Notch in cell culture and in vitro. These results characterize a new level of conserved regulation of Notch signaling by the ubiquitin system.
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Affiliation(s)
- Julien Moretti
- Institut Pasteur and CNRS Unité de Recherche Associée (URA) 2582, Signalisation Moléculaire et Activation Cellulaire, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France
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Sassoli C, Pini A, Mazzanti B, Quercioli F, Nistri S, Saccardi R, Orlandini SZ, Bani D, Formigli L. Mesenchymal stromal cells affect cardiomyocyte growth through juxtacrine Notch-1/Jagged-1 signaling and paracrine mechanisms: Clues for cardiac regeneration. J Mol Cell Cardiol 2011; 51:399-408. [DOI: 10.1016/j.yjmcc.2011.06.004] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 05/19/2011] [Accepted: 06/01/2011] [Indexed: 01/24/2023]
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Sassi N, Laadhar L, Driss M, Kallel-Sellami M, Sellami S, Makni S. The role of the Notch pathway in healthy and osteoarthritic articular cartilage: from experimental models to ex vivo studies. Arthritis Res Ther 2011; 13:208. [PMID: 21457519 PMCID: PMC3132010 DOI: 10.1186/ar3255] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Osteoarthritis is the most prevalent form of arthritis in the world. With the progressive ageing of the population, it is becoming a major public health problem. The involvement of certain signaling pathways, such as the Notch pathway, during cartilage pathology has been reported. In this review, we report on studies that investigated the expression pattern of the Notch family members in articular cartilage and the eventual involvement of this pathway in the modulation of the physiology and pathology of chondrocytes. Temporal and/or spatial modulation of this signaling pathway may help these cells to synthesize a new functional extracellular matrix and restore the functional properties of the articular cartilage.
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Affiliation(s)
- Nadia Sassi
- Osteoarthritis-osteoporosis Research Laboratory, Rheumatology Department, LaRabta Hospital, 1007 Tunis, Tunisia.
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Popovic M, Bella J, Zlatev V, Hodnik V, Anderluh G, Barlow PN, Pintar A, Pongor S. The interaction of Jagged-1 cytoplasmic tail with afadin PDZ domain is local, folding-independent, and tuned by phosphorylation. J Mol Recognit 2011; 24:245-53. [DOI: 10.1002/jmr.1042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hansson EM, Lanner F, Das D, Mutvei A, Marklund U, Ericson J, Farnebo F, Stumm G, Stenmark H, Andersson ER, Lendahl U. Control of Notch-ligand endocytosis by ligand-receptor interaction. J Cell Sci 2011; 123:2931-42. [PMID: 20720151 DOI: 10.1242/jcs.073239] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In Notch signaling, cell-bound ligands activate Notch receptors on juxtaposed cells, but the relationship between ligand endocytosis, ubiquitylation and ligand-receptor interaction remains poorly understood. To study the specific role of ligand-receptor interaction, we identified a missense mutant of the Notch ligand Jagged1 (Nodder, Ndr) that failed to interact with Notch receptors, but retained a cellular distribution that was similar to wild-type Jagged1 (Jagged1(WT)) in the absence of active Notch signaling. Both Jagged1(WT) and Jagged1(Ndr) interacted with the E3 ubiquitin ligase Mind bomb, but only Jagged1(WT) showed enhanced ubiquitylation after co-culture with cells expressing Notch receptor. Cells expressing Jagged1(WT), but not Jagged1(Ndr), trans-endocytosed the Notch extracellular domain (NECD) into the ligand-expressing cell, and NECD colocalized with Jagged1(WT) in early endosomes, multivesicular bodies and lysosomes, suggesting that NECD is routed through the endocytic degradation pathway. When coexpressed in the same cell, Jagged1(Ndr) did not exert a dominant-negative effect over Jagged1(WT) in terms of receptor activation. Finally, in Jag1(Ndr/Ndr) mice, the ligand was largely accumulated at the cell surface, indicating that engagement of the Notch receptor is important for ligand internalization in vivo. In conclusion, the interaction-dead Jagged1(Ndr) ligand provides new insights into the specific role of receptor-ligand interaction in the intracellular trafficking of Notch ligands.
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Affiliation(s)
- Emil M Hansson
- Department of Cell and Molecular Biology, Medical Nobel Institute, Karolinska Institute, SE-171 77 Stockholm, Sweden
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Moretti J, Chastagner P, Gastaldello S, Heuss SF, Dirac AM, Bernards R, Masucci MG, Israël A, Brou C. The translation initiation factor 3f (eIF3f) exhibits a deubiquitinase activity regulating Notch activation. PLoS Biol 2010; 8:e1000545. [PMID: 21124883 PMCID: PMC2990700 DOI: 10.1371/journal.pbio.1000545] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 10/07/2010] [Indexed: 01/03/2023] Open
Abstract
The translation initiation factor complex eIF3f has an intrinsic deubiquitinase activity and regulates the Notch signaling pathway. Activation of the mammalian Notch receptor after ligand binding relies on a succession of events including metalloprotease-cleavage, endocytosis, monoubiquitination, and eventually processing by the gamma-secretase, giving rise to a soluble, transcriptionally active molecule. The Notch1 receptor was proposed to be monoubiquitinated before its gamma-secretase cleavage; the targeted lysine has been localized to its submembrane domain. Investigating how this step might be regulated by a deubiquitinase (DUB) activity will provide new insight for understanding Notch receptor activation and downstream signaling. An immunofluorescence-based screening of an shRNA library allowed us to identify eIF3f, previously known as one of the subunits of the translation initiation factor eIF3, as a DUB targeting the activated Notch receptor. We show that eIF3f has an intrinsic DUB activity. Knocking down eIF3f leads to an accumulation of monoubiquitinated forms of activated Notch, an effect counteracted by murine WT eIF3f but not by a catalytically inactive mutant. We also show that eIF3f is recruited to activated Notch on endocytic vesicles by the putative E3 ubiquitin ligase Deltex1, which serves as a bridging factor. Finally, catalytically inactive forms of eIF3f as well as shRNAs targeting eIF3f repress Notch activation in a coculture assay, showing that eIF3f is a new positive regulator of the Notch pathway. Our results support two new and provocative conclusions: (1) The activated form of Notch needs to be deubiquitinated before being processed by the gamma-secretase activity and entering the nucleus, where it fulfills its transcriptional function. (2) The enzyme accounting for this deubiquitinase activity is eIF3f, known so far as a translation initiation factor. These data improve our knowledge of Notch signaling but also open new avenues of research on the Zomes family and the translation initiation factors. The highly conserved signaling pathway involving the transmembrane receptor Notch is essential for development, and misregulation of this pathway is linked to many diseases. We previously proposed that the Notch1 receptor is monoubiquitinated during its activation. With the aim of identifying a deubiquinating enzyme that could regulate Notch activation, we demonstrated that eIF3f, known previously as part of the multiprotein translation initiation factor eIF3 complex, harbors an enzymatic activity that acts on Notch. The activated form of Notch is able to interact with eIF3f only in the presence of the E3 ubiquitin ligase Deltex, and Notch needs to be deubiquitinated before it can be cleared and its intracellular domain can enter the nucleus and fulfill its transcriptional function. Our results further decipher the molecular mechanisms of Notch signaling activation, showing that ubiquitination and deubiquitination events are required. Additionally, we show that beyond acting as a translation initiation factor, eIF3f fulfills other functions and has an intrinsic enzymatic activity.
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Affiliation(s)
- Julien Moretti
- Institut Pasteur, Unité de Signalisation Moléculaire et Activation Cellulaire and CNRS URA 2582, rue du Dr. Roux, Paris, France
| | - Patricia Chastagner
- Institut Pasteur, Unité de Signalisation Moléculaire et Activation Cellulaire and CNRS URA 2582, rue du Dr. Roux, Paris, France
| | - Stefano Gastaldello
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Sara F. Heuss
- Institut Pasteur, Unité de Signalisation Moléculaire et Activation Cellulaire and CNRS URA 2582, rue du Dr. Roux, Paris, France
| | - Annette M. Dirac
- Division of Molecular Carcinogenesis and Center for Biomedical Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - René Bernards
- Division of Molecular Carcinogenesis and Center for Biomedical Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Maria G. Masucci
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Alain Israël
- Institut Pasteur, Unité de Signalisation Moléculaire et Activation Cellulaire and CNRS URA 2582, rue du Dr. Roux, Paris, France
| | - Christel Brou
- Institut Pasteur, Unité de Signalisation Moléculaire et Activation Cellulaire and CNRS URA 2582, rue du Dr. Roux, Paris, France
- * E-mail:
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Vaccari T, Duchi S, Cortese K, Tacchetti C, Bilder D. The vacuolar ATPase is required for physiological as well as pathological activation of the Notch receptor. Development 2010; 137:1825-32. [PMID: 20460366 PMCID: PMC2867318 DOI: 10.1242/dev.045484] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/25/2010] [Indexed: 01/23/2023]
Abstract
Evidence indicates that endosomal entry promotes signaling by the Notch receptor, but the mechanisms involved are not clear. In a search for factors that regulate Notch activation in endosomes, we isolated mutants in Drosophila genes that encode subunits of the vacuolar ATPase (V-ATPase) proton pump. Cells lacking V-ATPase function display impaired acidification of the endosomal compartment and a correlated failure to degrade endocytic cargoes. V-ATPase mutant cells internalize Notch and accumulate it in the lysosome, but surprisingly also show a substantial loss of both physiological and ectopic Notch activation in endosomes. V-ATPase activity is required in signal-receiving cells for Notch signaling downstream of ligand activation but upstream of gamma-secretase-dependent S3 cleavage. These data indicate that V-ATPase, probably via acidification of early endosomes, promotes not only the degradation of Notch in the lysosome but also the activation of Notch signaling in endosomes. The results also suggest that the ionic properties of the endosomal lumen might regulate Notch cleavage, providing a rationale for physiological as well as pathological endocytic control of Notch activity.
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Affiliation(s)
- Thomas Vaccari
- Molecular and Cell Biology, University of California, LSA #3200, Berkeley, CA 94720, USA
- IFOM, Istituto FIRC di Oncologia Molecolare, via Adamello 16, 20139, Milano, Italy
| | - Serena Duchi
- IFOM, Istituto FIRC di Oncologia Molecolare, via Adamello 16, 20139, Milano, Italy
| | - Katia Cortese
- Centro di Ricerca MicroSCoBio/IFOM Fondazione Istituto FIRC di Oncologia Molecolare, Dipartimento di Medicina Sperimentale, Università di Genova, Via de Toni 14, 16132, Genoa, Italy
| | - Carlo Tacchetti
- Centro di Ricerca MicroSCoBio/IFOM Fondazione Istituto FIRC di Oncologia Molecolare, Dipartimento di Medicina Sperimentale, Università di Genova, Via de Toni 14, 16132, Genoa, Italy
| | - David Bilder
- Molecular and Cell Biology, University of California, LSA #3200, Berkeley, CA 94720, USA
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Abstract
Notch receptors are transmembrane receptors that regulate cell fate decisions. There are four Notch receptors in mammals. Upon binding to members of the Delta and Jagged family of transmembrane proteins, Notch is cleaved and the Notch intracellular domain (NICD) is released. NICD then translocates to the nucleus, where it associates with the CBF-1, Suppressor of Hairless, and Lag-2 (CSL) and Mastermind-Like (MAML) proteins. This complex activates the transcription of Notch target genes, such as Hairy Enhancer of Split (Hes) and Hes-related with YRPF motif (Hey). Notch signaling is critical for the regulation of mesenchymal stem cell differentiation. Misexpression of Notch in skeletal tissue indicates a role as an inhibitor of skeletal development and postnatal bone formation. Overexpression of Notch inhibits endochondral bone formation and osteoblastic differentiation, causing severe osteopenia. Conditional inactivation of Notch in the skeleton causes an increase in cancellous bone volume and enhanced osteoblastic differentiation. Notch ligands are expressed in the hematopoietic stem cell niche and are critical for the regulation of hematopoietic stem cell self-renewal. Dysregulation of Notch signaling is the underlying cause of diseases affecting the skeletal tissue, including Alagille syndrome, spondylocostal dysostosis, and possibly, osteosarcoma.
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Shalaby NA, Parks AL, Morreale EJ, Osswalt MC, Pfau KM, Pierce EL, Muskavitch MAT. A screen for modifiers of notch signaling uncovers Amun, a protein with a critical role in sensory organ development. Genetics 2009; 182:1061-76. [PMID: 19448274 PMCID: PMC2728848 DOI: 10.1534/genetics.108.099986] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2009] [Accepted: 05/11/2009] [Indexed: 12/14/2022] Open
Abstract
Notch signaling is an evolutionarily conserved pathway essential for many cell fate specification events during metazoan development. We conducted a large-scale transposon-based screen in the developing Drosophila eye to identify genes involved in Notch signaling. We screened 10,447 transposon lines from the Exelixis collection for modifiers of cell fate alterations caused by overexpression of the Notch ligand Delta and identified 170 distinct modifier lines that may affect up to 274 genes. These include genes known to function in Notch signaling, as well as a large group of characterized and uncharacterized genes that have not been implicated in Notch pathway function. We further analyze a gene that we have named Amun and show that it encodes a protein that localizes to the nucleus and contains a putative DNA glycosylase domain. Genetic and molecular analyses of Amun show that altered levels of Amun function interfere with cell fate specification during eye and sensory organ development. Overexpression of Amun decreases expression of the proneural transcription factor Achaete, and sensory organ loss caused by Amun overexpression can be rescued by coexpression of Achaete. Taken together, our data suggest that Amun acts as a transcriptional regulator that can affect cell fate specification by controlling Achaete levels.
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Affiliation(s)
- Nevine A Shalaby
- Biology Department, Boston College, Chestnut Hill, Massachusetts 02467, USA
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