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Zhang J, Liu Y, Chang J, Zhang R, Liu Z, Liang J, Wang D, Feng J, Zhao W, Xiao H. Shh Gene Regulates the Proliferation and Apoptosis of Dermal Papilla Cells to Affect Its Differential Expression in Secondary Hair Follicle Growth Cycle of Cashmere Goats. Animals (Basel) 2024; 14:2049. [PMID: 39061511 PMCID: PMC11273991 DOI: 10.3390/ani14142049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Revised: 07/04/2024] [Accepted: 07/08/2024] [Indexed: 07/28/2024] Open
Abstract
Sonic hedgehog (Shh) is a component of the Hedgehog signaling pathway, playing an important role in regulating cell proliferation, differentiation, apoptosis, and the repair of damaged organisms. To further clarify the expression pattern of Shh gene in the secondary hair follicle growth cycle of cashmere goats and its mechanism of action on secondary hair follicle papilla cells, and improve cashmere quality, in this study, we took Inner Mongolia Albas white cashmere goats as the research objects and collected skin samples at different growth stages to obtain secondary hair follicles, detected Shh and its gene expression by RT-qPCR, Western blot, immunohistochemistry, and other techniques, while we also cultured DPCs in vitro. Shh gene overexpression and interference vectors were constructed, and the effects of Shh gene on the proliferation and apoptosis of DPCs were studied through cell transfection technology. The results showed that there are significant differences in Shh and its gene expression in the secondary hair follicle growth cycle skins of cashmere goats, with the highest expression level in anagen, followed by catagen, and the lowest expression level in telogen. Shh was mainly expressed in the inner root sheath, outer root sheath, and secondary hair follicle papilla. After the overexpression of Shh gene, the proliferation and vitality of the hair papilla cells were enhanced compared to the interference group. After Shh gene interference, the apoptosis rate of the cells increased, indicating that Shh gene can regulate downstream Ptch, Smo, and Gli2 gene expression to promote the proliferation of DPCs, and thus form its expression pattern in the secondary hair follicle growth cycle of cashmere goats.
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Affiliation(s)
- Junjie Zhang
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Yujing Liu
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Jiale Chang
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Ru Zhang
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Zhaomin Liu
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Jiayue Liang
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Dong Wang
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Juan Feng
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Wei Zhao
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
| | - Hongmei Xiao
- College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010010, China
- Inner Mongolia Autonomous Region Key Laboratory of Biomanufacturing, Hohhot 010010, China
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2
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Zhao JB, Fan MZ, Shi YX, Zhu YT, Gao SX, Li GL, Guan JC, Zhou P. Staphylococcal enterotoxin B exposed to pregnant rats inhibits the hedgehog signaling pathway in thymic T lymphocytes of the offspring. Microb Pathog 2024; 192:106723. [PMID: 38823465 DOI: 10.1016/j.micpath.2024.106723] [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: 10/30/2023] [Revised: 05/17/2024] [Accepted: 05/29/2024] [Indexed: 06/03/2024]
Abstract
The Hedgehog (Hh) signaling pathway is involved in T cell differentiation and development and plays a major regulatory part in different stages of T cell development. A previous study by us suggested that prenatal exposure to staphylococcal enterotoxin B (SEB) changed the percentages of T cell subpopulation in the offspring thymus. However, it is unclear whether prenatal SEB exposure impacts the Hh signaling pathway in thymic T cells. In the present study, pregnant rats at gestational day 16 were intravenously injected once with 15 μg SEB, and the thymi of both neonatal and adult offspring rats were aseptically acquired to scrutinize the effects of SEB on the Hh signaling pathway. It firstly found that prenatal SEB exposure clearly caused the increased expression of Shh and Dhh ligands of the Hh signaling pathway in thymus tissue of both neonatal and adult offspring rats, but significantly decreased the expression levels of membrane receptors of Ptch1 and Smo, transcription factor Gli1, as well as target genes of CyclinD1, C-myc, and N-myc in Hh signaling pathway of thymic T cells. These data suggest that prenatal SEB exposure inhibits the Hh signaling pathway in thymic T lymphocytes of the neonatal offspring, and this effect can be maintained in adult offspring via the imprinting effect.
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Affiliation(s)
- Jia-Bao Zhao
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China
| | - Meng-Zhu Fan
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China
| | - Yin-Xing Shi
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China
| | - Yu-Ting Zhu
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China
| | - Shu-Xian Gao
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China; Department of Microbiology, Bengbu Medical College, Bengbu, Anhui, 233030, PR China
| | - Guang-Lin Li
- Majored in Biological Science, Bengbu Medical College, Bengbu, Anhui, 233030, PR China
| | - Jun-Chang Guan
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China; Department of Microbiology, Bengbu Medical College, Bengbu, Anhui, 233030, PR China.
| | - Ping Zhou
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, Anhui, 233030, PR China; Department of Microbiology, Bengbu Medical College, Bengbu, Anhui, 233030, PR China.
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3
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Understanding the Roles of the Hedgehog Signaling Pathway during T-Cell Lymphopoiesis and in T-Cell Acute Lymphoblastic Leukemia (T-ALL). Int J Mol Sci 2023; 24:ijms24032962. [PMID: 36769284 PMCID: PMC9917970 DOI: 10.3390/ijms24032962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/27/2023] [Accepted: 01/30/2023] [Indexed: 02/05/2023] Open
Abstract
The Hedgehog (HH) signaling network is one of the main regulators of invertebrate and vertebrate embryonic development. Along with other networks, such as NOTCH and WNT, HH signaling specifies both the early patterning and the polarity events as well as the subsequent organ formation via the temporal and spatial regulation of cell proliferation and differentiation. However, aberrant activation of HH signaling has been identified in a broad range of malignant disorders, where it positively influences proliferation, survival, and therapeutic resistance of neoplastic cells. Inhibitors targeting the HH pathway have been tested in preclinical cancer models. The HH pathway is also overactive in other blood malignancies, including T-cell acute lymphoblastic leukemia (T-ALL). This review is intended to summarize our knowledge of the biological roles and pathophysiology of the HH pathway during normal T-cell lymphopoiesis and in T-ALL. In addition, we will discuss potential therapeutic strategies that might expand the clinical usefulness of drugs targeting the HH pathway in T-ALL.
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Lau CI, Yánez DC, Papaioannou E, Ross S, Crompton T. Sonic Hedgehog signalling in the regulation of barrier tissue homeostasis and inflammation. FEBS J 2022; 289:8050-8061. [PMID: 34614300 DOI: 10.1111/febs.16222] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 09/10/2021] [Accepted: 10/05/2021] [Indexed: 01/14/2023]
Abstract
Epithelial barrier tissues such as the skin and airway form an essential interface between the mammalian host and its external environment. These physical barriers are crucial to prevent damage and disease from environmental insults and allergens. Failure to maintain barrier function against such risks can lead to severe inflammatory disorders, including atopic dermatitis and asthma. Here, we discuss the role of the morphogen Sonic Hedgehog in postnatal skin and lung and the impact of Shh signalling on repair, inflammation, and atopic disease in these tissues.
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Affiliation(s)
- Ching-In Lau
- UCL Great Ormond Street Institute of Child Health, London, UK
| | - Diana C Yánez
- UCL Great Ormond Street Institute of Child Health, London, UK.,School of Medicine, Universidad San Francisco de Quito, Ecuador
| | - Eleftheria Papaioannou
- UCL Great Ormond Street Institute of Child Health, London, UK.,Department of Biochemistry, Universidad Autónoma de Madrid and Instituto de Investigaciones Biomédicas Alberto Sols, Madrid, Spain
| | - Susan Ross
- UCL Great Ormond Street Institute of Child Health, London, UK
| | - Tessa Crompton
- UCL Great Ormond Street Institute of Child Health, London, UK
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5
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Li R, Cai Y, Lin H, Dong L, Tang M, Lang Y, Qi Y, Peng Y, Zhou B, Yang G, Teng Y, Yang X. Generation of an Ihh-mKate2-Dre knock-in mouse line. Genesis 2022; 60:e23488. [PMID: 35765931 DOI: 10.1002/dvg.23488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 05/16/2022] [Accepted: 05/25/2022] [Indexed: 11/06/2022]
Abstract
Indian hedgehog (Ihh), a member of the Hh family, plays important roles in vertebrate development and homeostasis. To improve our understanding of the function of Ihh-expressing cells and their progeny as well, we generate an Ihh-mKate2tomm20 -Dre knock-in mouse line that can label Ihh-positive cells with a fluorescence protein mKate2 and trace Ihh-positive cells and their progeny via Dre-mediated recombination. Consistent with previous reports, we verified Ihh expression in hypertrophic chondrocytes of growth plate and granulosa cells of ovarian follicles by mKate2 immunostaining, and meanwhile confirmed Dre activity in these cells via a Dre reporter mouse line Rosa26-confetti2. We also found, for the first time, that Ihh can mark some cell types, including retinal ganglion cells, Purkinje cells, and gallbladder epithelial cells. Taken together, the Ihh-mKate2tomm20 -Dre mouse is a genetic tool for examining the precise expression profile of Ihh and tracing Ihh-expressing cells and their progeny.
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Affiliation(s)
- Rongyu Li
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Yunting Cai
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Huisang Lin
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Lei Dong
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Mingchuan Tang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Yiming Lang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Yini Qi
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Yanli Peng
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Bin Zhou
- The State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, China
| | - Guan Yang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Yan Teng
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
| | - Xiao Yang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
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Lau CI, Yánez DC, Solanki A, Papaioannou E, Saldaña JI, Crompton T. Foxa1 and Foxa2 in thymic epithelial cells (TEC) regulate medullary TEC and regulatory T-cell maturation. J Autoimmun 2018; 93:131-138. [PMID: 30061015 PMCID: PMC6119767 DOI: 10.1016/j.jaut.2018.07.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 07/11/2018] [Accepted: 07/15/2018] [Indexed: 11/25/2022]
Abstract
The Foxa1 and Foxa2 transcription factors are essential for mouse development. Here we show that they are expressed in thymic epithelial cells (TEC) where they regulate TEC development and function, with important consequences for T-cell development. TEC are essential for T-cell differentiation, lineage decisions and repertoire selection. Conditional deletion of Foxa1 and Foxa2 from murine TEC led to a smaller thymus with a greater proportion of TEC and a greater ratio of medullary to cortical TEC. Cell-surface MHCI expression was increased on cortical TEC in the conditional Foxa1Foxa2 knockout thymus, and MHCII expression was reduced on both cortical and medullary TEC populations. These changes in TEC differentiation and MHC expression led to a significant reduction in thymocyte numbers, reduced positive selection of CD4+CD8+ cells to the CD4 lineage, and increased CD8 cell differentiation. Conditional deletion of Foxa1 and Foxa2 from TEC also caused an increase in the medullary TEC population, and increased expression of Aire, but lower cell surface MHCII expression on Aire-expressing mTEC, and increased production of regulatory T-cells. Thus, Foxa1 and Foxa2 in TEC promote positive selection of CD4SP T-cells and modulate regulatory T-cell production and activity, of importance to autoimmunity.
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Affiliation(s)
- Ching-In Lau
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Diana C Yánez
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Anisha Solanki
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Eleftheria Papaioannou
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - José Ignacio Saldaña
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK; School of Health, Sport and Bioscience, University of East London, Water Lane, London E15 4LZ, UK
| | - Tessa Crompton
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK.
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Lau CI, Barbarulo A, Solanki A, Saldaña JI, Crompton T. The kinesin motor protein Kif7 is required for T-cell development and normal MHC expression on thymic epithelial cells (TEC) in the thymus. Oncotarget 2018; 8:24163-24176. [PMID: 28445929 PMCID: PMC5421836 DOI: 10.18632/oncotarget.15241] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 01/21/2017] [Indexed: 11/30/2022] Open
Abstract
Kif7 is a ciliary kinesin motor protein that regulates mammalian Hedgehog pathway activation through influencing structure of the primary cilium. Here we show that Kif7 is required for normal T-cell development, despite the fact that T-cells lack primary cilia. Analysis of Kif7-deficient thymus showed that Kif7-deficiency increases the early CD44+CD25+CD4-CD8- thymocyte progenitor population but reduces differentiation to CD4+CD8+ double positive (DP) cell. At the transition from DP to mature T-cell, Kif7-deficiency selectively delayed maturation to the CD8 lineage. Expression of CD5, which correlates with TCR signal strength, was reduced on DP and mature CD4 and CD8 cells, as a result of thymocyte-intrinsic Kif7-deficiency, and Kif7-deficient T-cells from radiation chimeras activated less efficiently when stimulated with anti-CD3 and anti-CD28 in vitro. Kif7-deficient thymocytes showed higher expression of the Hedgehog target gene Ptch1 than WT, but were less sensitive to treatment with recombinant Shh, and Kif7-deficient T-cell development was refractory to neutralisation of endogenous Hh proteins, indicating that Kif7-deficient thymocytes were unable to interpret changes in the Hedgehog signal. In addition, Kif7-deficiency reduced cell-surface MHCII expression on thymic epithelial cells.
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Affiliation(s)
- Ching-In Lau
- Immunobiology Section, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Alessandro Barbarulo
- Immunobiology Section, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Anisha Solanki
- Immunobiology Section, UCL Great Ormond Street Institute of Child Health, London, UK
| | - José Ignacio Saldaña
- Immunobiology Section, UCL Great Ormond Street Institute of Child Health, London, UK.,School of Health, Sport and Bioscience, University of East London, London, UK
| | - Tessa Crompton
- Immunobiology Section, UCL Great Ormond Street Institute of Child Health, London, UK
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Lin W, Li D, Cheng L, Li L, Liu F, Hand NJ, Epstein JA, Rader DJ. Zinc transporter Slc39a8 is essential for cardiac ventricular compaction. J Clin Invest 2018; 128:826-833. [PMID: 29337306 PMCID: PMC5785267 DOI: 10.1172/jci96993] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 11/21/2017] [Indexed: 01/16/2023] Open
Abstract
Isolated left ventricular noncompaction (LVNC) results from excessive trabeculation and impaired myocardial compaction during heart development. The extracellular matrix (ECM) that separates endocardium from myocardium plays a critical but poorly understood role in ventricular trabeculation and compaction. In an attempt to characterize solute carrier family 39 member 8-null (Slc39a8-null) mice, we discovered that homozygous null embryos do not survive embryogenesis and exhibit a cardiac phenotype similar to human LVNC. Slc39a8 encodes a divalent metal cation importer that has been implicated in ECM degradation through the zinc/metal regulatory transcription factor 1 (Zn/MTF1) axis, which promotes the expression of ECM-degrading enzymes, including Adamts metalloproteinases. Here, we have shown that Slc39a8 is expressed by endothelial cells in the developing mouse heart, where it serves to maintain cellular Zn levels. Furthermore, Slc39a8-null hearts exhibited marked ECM accumulation and reduction of several Adamts metalloproteinases. Consistent with the in vivo observations, knockdown of SLC39A8 in HUVECs decreased ADAMTS1 transcription by decreasing cellular Zn uptake and, as a result, MTF1 transcriptional activity. Our study thus identifies a gene underlying ventricular trabeculation and compaction development, and a pathway regulating ECM during myocardial morphogenesis.
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Affiliation(s)
| | - Deqiang Li
- Department of Cell and Developmental Biology, and
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Lan Cheng
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Li Li
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Feiyan Liu
- Department of Cell and Developmental Biology, and
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Jonathan A. Epstein
- Department of Cell and Developmental Biology, and
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Daniel J. Rader
- Department of Genetics
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Solanki A, Yanez DC, Ross S, Lau CI, Papaioannou E, Li J, Saldaña JI, Crompton T. Gli3 in fetal thymic epithelial cells promotes thymocyte positive selection and differentiation by repression of Shh. Development 2018; 145:dev.146910. [PMID: 29361554 PMCID: PMC5817998 DOI: 10.1242/dev.146910] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 01/03/2018] [Indexed: 12/15/2022]
Abstract
Gli3 is a Hedgehog (Hh)-responsive transcription factor that can function as a transcriptional repressor or activator. We show that Gli3 activity in mouse thymic epithelial cells (TECs) promotes positive selection and differentiation from CD4+ CD8+ to CD4+ CD8- single-positive (SP4) cells in the fetal thymus and that Gli3 represses Shh Constitutive deletion of Gli3, and conditional deletion of Gli3 from TECs, reduced differentiation to SP4, whereas conditional deletion of Gli3 from thymocytes did not. Conditional deletion of Shh from TECs increased differentiation to SP4, and expression of Shh was upregulated in the Gli3-deficient thymus. Use of a transgenic Hh reporter showed that the Hh pathway was active in thymocytes, and increased in the Gli3-deficient fetal thymus. Neutralisation of endogenous Hh proteins in the Gli3-/- thymus restored SP4 differentiation, indicating that Gli3 in TECs promotes SP4 differentiation by repression of Shh Transcriptome analysis showed that Hh-mediated transcription was increased whereas TCR-mediated transcription was decreased in Gli3-/- thymocytes compared with wild type.
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Affiliation(s)
- Anisha Solanki
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Diana C Yanez
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Susan Ross
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Ching-In Lau
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | | | - Jiawei Li
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - José Ignacio Saldaña
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK.,School of Health, Sport and Bioscience, University of East London, London E15 4LZ, UK
| | - Tessa Crompton
- UCL GOS Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
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10
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Solanki A, Lau CI, Saldaña JI, Ross S, Crompton T. The transcription factor Gli3 promotes B cell development in fetal liver through repression of Shh. J Exp Med 2017; 214:2041-2058. [PMID: 28533268 PMCID: PMC5502423 DOI: 10.1084/jem.20160852] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 02/28/2017] [Accepted: 04/10/2017] [Indexed: 12/22/2022] Open
Abstract
Solanki et al. show that stromal activity of the transcription factor Gli3 is required for B cell development in the fetal liver. Gli3 functions to repress Shh expression, and Shh signals to developing B cells to regulate their development at multiple developmental stages. Before birth, B cells develop in the fetal liver (FL). In this study, we show that Gli3 activity in the FL stroma is required for B cell development. In the Gli3-deficient FL, B cell development was reduced at multiple stages, whereas the Sonic hedgehog (Hh [Shh])–deficient FL showed increased B cell development, and Gli3 functioned to repress Shh transcription. Use of a transgenic Hh-reporter mouse showed that Shh signals directly to developing B cells and that Hh pathway activation was increased in developing B cells from Gli3-deficient FLs. RNA sequencing confirmed that Hh-mediated transcription is increased in B-lineage cells from Gli3-deficient FL and showed that these cells expressed reduced levels of B-lineage transcription factors and B cell receptor (BCR)/pre-BCR–signaling genes. Expression of the master regulators of B cell development Ebf1 and Pax5 was reduced in developing B cells from Gli3-deficient FL but increased in Shh-deficient FL, and in vitro Shh treatment or neutralization reduced or increased their expression, respectively.
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Affiliation(s)
- Anisha Solanki
- Great Ormond Street Institute of Child Health, University College London, London, England, UK
| | - Ching-In Lau
- Great Ormond Street Institute of Child Health, University College London, London, England, UK
| | - José Ignacio Saldaña
- Great Ormond Street Institute of Child Health, University College London, London, England, UK.,School of Health, Sport, and Bioscience, University of East London, London, England, UK
| | - Susan Ross
- Great Ormond Street Institute of Child Health, University College London, London, England, UK
| | - Tessa Crompton
- Great Ormond Street Institute of Child Health, University College London, London, England, UK
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Hedgehog pathway activation in T-cell acute lymphoblastic leukemia predicts response to SMO and GLI1 inhibitors. Blood 2016; 128:2642-2654. [PMID: 27694322 DOI: 10.1182/blood-2016-03-703454] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 09/18/2016] [Indexed: 02/07/2023] Open
Abstract
T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive childhood leukemia that is caused by the accumulation of multiple genomic lesions resulting in transcriptional deregulation and increased cell proliferation and survival. Through analysis of gene expression data, we provide evidence that the hedgehog pathway is activated in 20% of T-ALL samples. Hedgehog pathway activation is associated with ectopic expression of the hedgehog ligands Sonic hedgehog (SHH) or Indian hedgehog (IHH), and with upregulation of the transcription factor GLI1 Ectopic expression of SHH or IHH in mouse T cells in vivo caused hedgehog pathway activation in both lymphoid and epithelial cells in the thymus and resulted in increased expression of important T-cell stimulatory ligands (Dll4, Il7, and Vegf) by thymic epithelial cells. In T-ALL cell lines, pharmacological inhibition or short interfering RNA-mediated knockdown of SMO or GLI1 led to decreased cell proliferation. Moreover, primary T-ALL cases with high GLI1 messenger RNA levels, but not those with low or undetectable GLI1 expression, were sensitive to hedgehog pathway inhibition by GANT61 or GDC-0449 (vismodegib) using ex vivo cultures and in vivo xenograft models. We identify the hedgehog pathway as a novel therapeutic target in T-ALL and demonstrate that hedgehog inhibitors approved by the US Food and Drug Administration could be used for the treatment of this rare leukemia.
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