1
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Zhang J, Yang L, Sun Y, Zhang L, Wang Y, Liu M, Li X, Liang Y, Zhao H, Liu Z, Qiu Z, Zhang T, Xie J. Up-regulation of miR-10a-5p expression inhibits the proliferation and differentiation of neural stem cells by targeting Chl1. Acta Biochim Biophys Sin (Shanghai) 2024. [PMID: 38841745 DOI: 10.3724/abbs.2024078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024] Open
Abstract
Neural tube defects (NTDs) are characterized by the failure of neural tube closure during embryogenesis and are considered the most common and severe central nervous system anomalies during early development. Recent microRNA (miRNA) expression profiling studies have revealed that the dysregulation of several miRNAs plays an important role in retinoic acid (RA)-induced NTDs. However, the molecular functions of these miRNAs in NTDs remain largely unidentified. Here, we show that miR-10a-5p is significantly upregulated in RA-induced NTDs and results in reduced cell growth due to cell cycle arrest and dysregulation of cell differentiation. Moreover, the cell adhesion molecule L1-like ( Chl1) is identified as a direct target of miR-10a-5p in neural stem cells (NSCs) in vitro, and its expression is reduced in RA-induced NTDs. siRNA-mediated knockdown of intracellular Chl1 affects cell proliferation and differentiation similar to those of miR-10a-5p overexpression, which further leads to the inhibition of the expressions of downstream ERK1/2 MAPK signaling pathway proteins. These cellular responses are abrogated by either increased expression of the direct target of miR-10a-5p ( Chl1) or an ERK agonist such as honokiol. Overall, our study demonstrates that miR-10a-5p plays a major role in the process of NSC growth and differentiation by directly targeting Chl1, which in turn induces the downregulation of the ERK1/2 cascade, suggesting that miR-10a-5p and Chl1 are critical for NTD formation in the development of embryos.
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Affiliation(s)
- Juan Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
- Department of Cell Biology and Genetics, School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, China
| | - Lihong Yang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Yuqing Sun
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Li Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Yufei Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Ming Liu
- Department of Cell Biology and Genetics, School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, China
| | - Xiujuan Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Yuxiang Liang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Hong Zhao
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Zhizhen Liu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
| | - Zhiyong Qiu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing 100020, China
| | - Ting Zhang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing 100020, China
| | - Jun Xie
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, China
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Chen Y, Pang J, Ye L, Zhang Z, Kang J, Qiu Z, Lin N, Liu H. Pin1 Downregulation Is Involved in Excess Retinoic Acid-Induced Failure of Neural Tube Closure. Int J Mol Sci 2024; 25:5588. [PMID: 38891776 PMCID: PMC11171630 DOI: 10.3390/ijms25115588] [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: 03/31/2024] [Revised: 05/15/2024] [Accepted: 05/19/2024] [Indexed: 06/21/2024] Open
Abstract
Neural tube defects (NTDs), which are caused by impaired embryonic neural tube closure, are one of the most serious and common birth defects. Peptidyl-prolyl cis/trans isomerase 1 (Pin1) is a prolyl isomerase that uniquely regulates cell signaling by manipulating protein conformation following phosphorylation, although its involvement in neuronal development remains unknown. In this study, we explored the involvement of Pin1 in NTDs and its potential mechanisms both in vitro and in vivo. The levels of Pin1 expression were reduced in NTD models induced by all-trans retinoic acid (Atra). Pin1 plays a significant role in regulating the apoptosis, proliferation, differentiation, and migration of neurons. Moreover, Pin1 knockdown significantly was found to exacerbate oxidative stress (OS) and endoplasmic reticulum stress (ERs) in neuronal cells. Further studies showed that the Notch1-Nrf2 signaling pathway may participate in Pin1 regulation of NTDs, as evidenced by the inhibition and overexpression of the Notch1-Nrf2 pathway. In addition, immunofluorescence (IF), co-immunoprecipitation (Co-IP), and GST pull-down experiments also showed that Pin1 interacts directly with Notch1 and Nrf2. Thus, our study suggested that the knocking down of Pin1 promotes NTD progression by inhibiting the activation of the Notch1-Nrf2 signaling pathway, and it is possible that this effect is achieved by disrupting the interaction of Pin1 with Notch1 and Nrf2, affecting their proteostasis. Our research identified that the regulation of Pin1 by retinoic acid (RA) and its involvement in the development of NTDs through the Notch1-Nrf2 axis could enhance our comprehension of the mechanism behind RA-induced brain abnormalities.
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Affiliation(s)
| | | | | | | | | | | | | | - Hekun Liu
- Fujian Key Laboratory of Translational Research in Cancer and Neurodegenerative Diseases, The School of Basic Medical Sciences, Fujian Medical University, Fuzhou 350122, China; (Y.C.); (J.P.); (L.Y.); (Z.Z.); (J.K.); (Z.Q.); (N.L.)
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3
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Paulissen E, Martin BL. Live Imaging Transverse Sections of Zebrafish Embryo Explants. Bio Protoc 2024; 14:e4928. [PMID: 38379824 PMCID: PMC10875355 DOI: 10.21769/bioprotoc.4928] [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: 10/13/2023] [Revised: 11/12/2023] [Accepted: 01/01/2024] [Indexed: 02/22/2024] Open
Abstract
Vertebrate embryogenesis is a highly dynamic process involving coordinated cell and tissue movements that generate the final embryonic body plan. Many of these movements are difficult to image at high resolution because they occur deep within the embryo along the midline, causing light scattering and requiring longer working distances. Here, we present an explant-based method to image transverse cross sections of living zebrafish embryos. This method allows for the capture of all cell movements at high-resolution throughout the embryonic trunk, including hard-to-image deep tissues. This technique offers an alternative to expensive or computationally difficult microscopy methods. Key features • Generates intact zebrafish explants with minimal tissue disturbance. • Allows for live imaging of deep tissues normally obscured by common confocal microscopy techniques. • Immobilizes tissues for extended periods required for time-lapse imaging. • Utilizes readily available reagents and tools, which can minimize the time and cost of the procedure.
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Affiliation(s)
- Eric Paulissen
- Department of Biochemistry and Cell Biology, Stony Brook University,
Stony Brook, NY, USA
| | - Benjamin L. Martin
- Department of Biochemistry and Cell Biology, Stony Brook University,
Stony Brook, NY, USA
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4
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Obino D, Maurin M, Dingli F, Loew D, Lescure A, Terriac E, Goudot C, Malbec O, Lankar D, Yuseff MI, Lennon-Duménil AM, Moreau HD. Medium-throughput image-based phenotypic siRNA screen to unveil the molecular basis of B cell polarization. Sci Data 2023; 10:401. [PMID: 37353541 PMCID: PMC10290135 DOI: 10.1038/s41597-023-02301-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 06/12/2023] [Indexed: 06/25/2023] Open
Abstract
Cell polarity is an essential and highly conserved process governing cell function. Cell polarization is generally triggered by an external signal that induces the relocation of the centrosome, thus defining the polarity axis of the cell. Here, we took advantage of B cells as a model to study cell polarity and perform a medium-throughput siRNA-based imaging screen to identify new molecular regulators of polarization. We first identified candidates based on a quantitative proteomic analysis of proteins differentially associated with the centrosome of resting non-polarized and stimulated polarized B cells. We then targeted 233 candidates in a siRNA screen and identified hits regulating the polarization of the centrosome and/or lysosomes in B cells upon stimulation. Our dataset of proteomics, images, and polarity indexes provides a valuable source of information for a broad community of scientists interested in the molecular mechanisms regulating cell polarity.
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Affiliation(s)
- Dorian Obino
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France.
| | - Mathieu Maurin
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France
| | - Florent Dingli
- Institut Curie, PSL Research University, CurieCoreTech Mass Spectrometry Proteomics, 75005, Paris, France
| | - Damarys Loew
- Institut Curie, PSL Research University, CurieCoreTech Mass Spectrometry Proteomics, 75005, Paris, France
| | - Aurianne Lescure
- Institut Curie, PSL Research University, Translational Research Department, BioPhenics Platform, PICT-IBISA, Paris, France
| | - Emmanuel Terriac
- Institut Curie, PSL Research University, CNRS UMR144, Paris, France
| | - Christel Goudot
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France
| | - Odile Malbec
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France
| | - Danielle Lankar
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France
| | - Maria-Isabel Yuseff
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France
- Department of Cellular and Molecular Biology, Faculty of Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Hélène D Moreau
- Institut Curie, PSL Research University, Inserm U932, Immunity and Cancer, 75005, Paris, France.
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5
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Martínez Traverso IM, Steimle JD, Zhao X, Wang J, Martin JF. LATS1/2 control TGFB-directed epithelial-to-mesenchymal transition in the murine dorsal cranial neuroepithelium through YAP regulation. Development 2022; 149:dev200860. [PMID: 36125128 PMCID: PMC9587805 DOI: 10.1242/dev.200860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 08/12/2022] [Indexed: 11/20/2022]
Abstract
Hippo signaling, an evolutionarily conserved kinase cascade involved in organ size control, plays key roles in various tissue developmental processes, but its role in craniofacial development remains poorly understood. Using the transgenic Wnt1-Cre2 driver, we inactivated the Hippo signaling components Lats1 and Lats2 in the cranial neuroepithelium of mouse embryos and found that the double conditional knockout (DCKO) of Lats1/2 resulted in neural tube and craniofacial defects. Lats1/2 DCKO mutant embryos had microcephaly with delayed and defective neural tube closure. Furthermore, neuroepithelial cell shape and architecture were disrupted within the cranial neural tube in Lats1/2 DCKO mutants. RNA sequencing of embryonic neural tubes revealed increased TGFB signaling in Lats1/2 DCKO mutants. Moreover, markers of epithelial-to-mesenchymal transition (EMT) were upregulated in the cranial neural tube. Inactivation of Hippo signaling downstream effectors, Yap and Taz, suppressed neuroepithelial defects, aberrant EMT and TGFB upregulation in Lats1/2 DCKO embryos, indicating that LATS1/2 function via YAP and TAZ. Our findings reveal important roles for Hippo signaling in modulating TGFB signaling during neural crest EMT.
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Affiliation(s)
- Idaliz M. Martínez Traverso
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030, USA
- Interdepartmental Graduate Program in Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jeffrey D. Steimle
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Xiaolei Zhao
- Department of Pediatrics, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Jun Wang
- Department of Pediatrics, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
- Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center and The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - James F. Martin
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030, USA
- Interdepartmental Graduate Program in Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, TX 77030, USA
- Cardiomyocyte Renewal Laboratory, Texas Heart Institute, Houston, TX 77030, USA
- Center for Organ Repair and Renewal, Baylor College of Medicine, Houston, TX 77030 , USA
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6
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Mohammed MR, El-Bahkery AM, Shedid SM. The Influence of Different γ-Irradiation Patterns on Factors that May Affect Cell Cycle Progression in Male Rats. Dose Response 2022; 20:15593258221117898. [PMID: 35982824 PMCID: PMC9379971 DOI: 10.1177/15593258221117898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Most studies of the biological effects of ionizing radiation have been done on a
single acute dose, while clinically and environmentally exposures occur under
chronic/repetitive conditions. It is important to study effects of different
patterns of ionizing radiation. In this study, a rat model was used to compare
the effects of repetitive and acute exposure. Groups: (I) control, (II, III)
were exposed to fractionated doses (1.5 GyX4) and (2 GyX4), respectively/24h
interval, and (IV, V) were exposed to 6 Gy and 8 Gy of whole-body gamma
irradiation, respectively. The gene expression of MAPT and tau phosphorylation
increased in all irradiated groups but the gene expression of PKN not affected.
TGFβ% increased at dose of 2 GyX4 only. In addition, the cell cycle was arrested
in S phase. Micronucleus (MN) increased and cell proliferation decreased. In
conclusion, the dose and pattern of ionizing radiation do not affect the MAPT
and PKN gene expression, but TGF-β, p-tau, MN assay and cell proliferation are
significantly affected. The dose of 2 GyX4 showed distinctive effect. Repetitive
exposure may increase TGF-β%, which causes radio-resistance and, G2/M delay.
Thus, the cell cycle could be regulated in a different manner according to the
dose and pattern of irradiation.
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7
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Yan Y, Wang G, Luo X, Zhang P, Peng S, Cheng X, Wang M, Yang X. Endoplasmic reticulum stress-related calcium imbalance plays an important role on Zinc oxide nanoparticles-induced failure of neural tube closure during embryogenesis. ENVIRONMENT INTERNATIONAL 2021; 152:106495. [PMID: 33730632 DOI: 10.1016/j.envint.2021.106495] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 01/21/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
Zinc oxide nanoparticles (ZnO NPs) have been increasingly and widely utilized in various fields, such as agriculture, food and cosmetics. However, various levels of adverse impacts of ZnO NPs on the ecological environment and public health have been associated with each stage of their production, use and disposal. ZnO NPs can be ingested by pregnant women and transferred to developing embryos/foetus through the placental barrier, however, the potential toxicity of ZnO NPs to embryonic and foetal development is largely unclear. In this study, we discovered that ZnO NPs exposure caused growth proportional failure of neural tube closure in mouse and chicken embryos and a simultaneous increase in apoptosis in the developing neural tubes of chicken embryos, which was verified in an in vitro experiment using the SH-SY5Y cell line. Furthermore, removal of free Zn2+ ions with EDTA or inhibition of Zn2+ ion absorption by CaCl2 partially alleviated the neurotoxicity induced by ZnO NPs, implying that ZnO NPs-induced developmental neurotoxicity is probably due to both ZnO NPs and the Zn2+ ions released from ZnO NPs. In addition, we found that ZnO NPs exposure caused endoplasmic reticulum stress-mediated apoptosis driven mainly by an increase in intracellular calcium (Ca2+) concentrations, rather than by the activation of three membrane protein receptors (ATF6, IRE-1 and PERK). Thus, Ca2+ imbalance-mediated apoptosis in the context of ZnO NPs exposure may lead to cellular dysfunctions in developing neural precursors, such as, abnormalities involved in neural tube closure, ultimately leading to neural tube defects (NTDs) during embryogenesis. In sum, our results revealed that ZnO NPs exposure greatly increases the risk of failure of neural tube closure through endoplasmic reticulum stress-mediated neural cell death in the developing embryos, which may further lead to the NTD in fetal stage, including failure of neural tube closure.
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Affiliation(s)
- Yu Yan
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China; School of Nursing, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Guang Wang
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Xin Luo
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Ping Zhang
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Shuang Peng
- Department of Pathophysiology, Medical College, Jinan University, Guangzhou 510632, China
| | - Xin Cheng
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Mengwei Wang
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China
| | - Xuesong Yang
- Division of Histology & Embryology, Key Laboratory for Regenerative Medicine of the Ministry of Education, Medical College, Jinan University, Guangzhou 510632, China.
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8
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Dou C, Tang M, Xia Y, Yang L, Qiu X, Li Y, Ye H, Wan L. Identification of In Vivo Metabolites of a Potential Anti-tumor Drug Candidate AMAC, in Rat Plasma, Urine and Feces Samples Using UHPLC/QTOF /MS/MS. CURR PHARM ANAL 2021. [DOI: 10.2174/1573412916666191230124527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Background:
Drugs based on natural products targeting the microtubule system remain an
important component in cancer therapy. Compound 10, 4-((3-amino-4-methoxyphenyl) amino)-2Hcoumarin,
derived from coumarin, showed excellent anti-proliferative activity through directly binding
to the colchicine-binding site in β-tubulin, suggesting that it could be a perfect drug candidate for antitumor
drug research and development. Identification and structural characterization of metabolites is a
critical step of both drug discovery and development research.
Objective:
Compound 10, 4-((3-amino-4-methoxyphenyl) amino)-2H-coumarin, derived from coumarin.
Method:
In this study, an efficient and sensitive method using Ultra High-Performance Liquid Chromatography
couple with Quadrupole Time of Flight tandem Mass Spectrometry (UHPLC/QTOF/
MS/MS) was successfully established and applied to identify the in vivo metabolites in plasma,
urine and feces samples of rats after intravenous administration of Compound 10 with a single dose of
10 mg/kg.
Result:
A total of eight metabolites (including two phase I and six phase II metabolites) had been detected
or tentatively identified in plasma, urine and feces, indicating the prominent metabolic pathways
were glucuronidation, demethylation and hydroxylation. In addition, in order to understand the structure
of metabolites more accurately, synthesis strategy was used to confirm the metabolite M3.
Conclusion:
The present study provides important information on the metabolism of Compound 10 in
vivo for the first time, which would be helpful for understanding the potential metabolic processes of
Compound 10 and paving the way for pharmacology and toxicology research.
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Affiliation(s)
- Caixia Dou
- School of pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, Sichuan Province,China
| | - Minghai Tang
- Lab of Natural Product Drugs, Cancer Center, West China Medical School, West China Hospital, Sichuan University, Chengdu, Sichuan Province,China
| | - Yuanyuan Xia
- School of pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, Sichuan Province,China
| | - Linyu Yang
- Lab of Natural Product Drugs, Cancer Center, West China Medical School, West China Hospital, Sichuan University, Chengdu, Sichuan Province,China
| | - Xiang Qiu
- School of pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, Sichuan Province,China
| | - Yong Li
- Lab of Natural Product Drugs, Cancer Center, West China Medical School, West China Hospital, Sichuan University, Chengdu, Sichuan Province,China
| | - Haoyu Ye
- Lab of Natural Product Drugs, Cancer Center, West China Medical School, West China Hospital, Sichuan University, Chengdu, Sichuan Province,China
| | - Li Wan
- School of pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, Sichuan Province,China
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9
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Werner JM, Negesse MY, Brooks DL, Caldwell AR, Johnson JM, Brewster RM. Hallmarks of primary neurulation are conserved in the zebrafish forebrain. Commun Biol 2021; 4:147. [PMID: 33514864 PMCID: PMC7846805 DOI: 10.1038/s42003-021-01655-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 12/23/2020] [Indexed: 11/25/2022] Open
Abstract
Primary neurulation is the process by which the neural tube, the central nervous system precursor, is formed from the neural plate. Incomplete neural tube closure occurs frequently, yet underlying causes remain poorly understood. Developmental studies in amniotes and amphibians have identified hingepoint and neural fold formation as key morphogenetic events and hallmarks of primary neurulation, the disruption of which causes neural tube defects. In contrast, the mode of neurulation in teleosts has remained highly debated. Teleosts are thought to have evolved a unique mode of neurulation, whereby the neural plate infolds in absence of hingepoints and neural folds, at least in the hindbrain/trunk where it has been studied. Using high-resolution imaging and time-lapse microscopy, we show here the presence of these morphological landmarks in the zebrafish anterior neural plate. These results reveal similarities between neurulation in teleosts and other vertebrates and hence the suitability of zebrafish to understand human neurulation. Jonathan Werner, Maraki Negesse et al. visualize zebrafish neurulation during development to determine whether hallmarks of neural tube formation in other vertebrates also apply to zebrafish. They find that neural tube formation in the forebrain shares features such as hingepoints and neural folds with other vertebrates, demonstrating the strength of the zebrafish model for understanding human neurulation.
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Affiliation(s)
- Jonathan M Werner
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Maraki Y Negesse
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Dominique L Brooks
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Allyson R Caldwell
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Jafira M Johnson
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Rachel M Brewster
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, 21250, USA.
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10
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Prem S, Millonig JH, DiCicco-Bloom E. Dysregulation of Neurite Outgrowth and Cell Migration in Autism and Other Neurodevelopmental Disorders. ADVANCES IN NEUROBIOLOGY 2020; 25:109-153. [PMID: 32578146 DOI: 10.1007/978-3-030-45493-7_5] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Despite decades of study, elucidation of the underlying etiology of complex developmental disorders such as autism spectrum disorder (ASD), schizophrenia (SCZ), intellectual disability (ID), and bipolar disorder (BPD) has been hampered by the inability to study human neurons, the heterogeneity of these disorders, and the relevance of animal model systems. Moreover, a majority of these developmental disorders have multifactorial or idiopathic (unknown) causes making them difficult to model using traditional methods of genetic alteration. Examination of the brains of individuals with ASD and other developmental disorders in both post-mortem and MRI studies shows defects that are suggestive of dysregulation of embryonic and early postnatal development. For ASD, more recent genetic studies have also suggested that risk genes largely converge upon the developing human cerebral cortex between weeks 8 and 24 in utero. Yet, an overwhelming majority of studies in autism rodent models have focused on postnatal development or adult synaptic transmission defects in autism related circuits. Thus, studies looking at early developmental processes such as proliferation, cell migration, and early differentiation, which are essential to build the brain, are largely lacking. Yet, interestingly, a few studies that did assess early neurodevelopment found that alterations in brain structure and function associated with neurodevelopmental disorders (NDDs) begin as early as the initial formation and patterning of the neural tube. By the early to mid-2000s, the derivation of human embryonic stem cells (hESCs) and later induced pluripotent stem cells (iPSCs) allowed us to study living human neural cells in culture for the first time. Specifically, iPSCs gave us the unprecedented ability to study cells derived from individuals with idiopathic disorders. Studies indicate that iPSC-derived neural cells, whether precursors or "matured" neurons, largely resemble cortical cells of embryonic humans from weeks 8 to 24. Thus, these cells are an excellent model to study early human neurodevelopment, particularly in the context of genetically complex diseases. Indeed, since 2011, numerous studies have assessed developmental phenotypes in neurons derived from individuals with both genetic and idiopathic forms of ASD and other NDDs. However, while iPSC-derived neurons are fetal in nature, they are post-mitotic and thus cannot be used to study developmental processes that occur before terminal differentiation. Moreover, it is important to note that during the 8-24-week window of human neurodevelopment, neural precursor cells are actively undergoing proliferation, migration, and early differentiation to form the basic cytoarchitecture of the brain. Thus, by studying NPCs specifically, we could gain insight into how early neurodevelopmental processes contribute to the pathogenesis of NDDs. Indeed, a few studies have explored NPC phenotypes in NDDs and have uncovered dysregulations in cell proliferation. Yet, few studies have explored migration and early differentiation phenotypes of NPCs in NDDs. In this chapter, we will discuss cell migration and neurite outgrowth and the role of these processes in neurodevelopment and NDDs. We will begin by reviewing the processes that are important in early neurodevelopment and early cortical development. We will then delve into the roles of neurite outgrowth and cell migration in the formation of the brain and how errors in these processes affect brain development. We also provide review of a few key molecules that are involved in the regulation of neurite outgrowth and migration while discussing how dysregulations in these molecules can lead to abnormalities in brain structure and function thereby highlighting their contribution to pathogenesis of NDDs. Then we will discuss whether neurite outgrowth, migration, and the molecules that regulate these processes are associated with ASD. Lastly, we will review the utility of iPSCs in modeling NDDs and discuss future goals for the study of NDDs using this technology.
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Affiliation(s)
- Smrithi Prem
- Graduate Program in Neuroscience, Rutgers University, Piscataway, NJ, USA
| | - James H Millonig
- Department of Neuroscience and Cell Biology, Center for Advanced Biotechnology and Medicine, Rutgers Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, USA
| | - Emanuel DiCicco-Bloom
- Department of Neuroscience and Cell Biology/Pediatrics, Rutgers Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, USA.
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11
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Wang G, Lu JQ, Ding Y, Zhang T, Song JH, Long D, Liang J, Cheng X, Si Z, Qi G, Jiang X, Yang X. Baicalin rescues hyperglycemia-induced neural tube defects via targeting on retinoic acid signaling. Am J Transl Res 2020; 12:3311-3328. [PMID: 32774702 PMCID: PMC7407732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
We, in this study, studied whether or not antioxidant activities of Baicalin could reduce the incidence of neural tube defects (NTDs) in the presence of hyperglycemia. Using early chick embryos, we demonstrated that Baicalin at 6 μM dramatically reduced NTDs rate and impaired neurogenesis in E4.5-day and HH10 chick embryo neural tubes induced by high glucose (HG). Likewise, immunofluorescent staining showed that Baicalin mitigated the HG-induced regression of Pax7 expression in neural tubes of both HH10 and E4.5-day chick embryos. Additionally, PHIS3 immunofluorescent staining in neural tubes of both HH10 and E4.5-day chick embryos manifested that cell proliferation inhibited by HG was significantly reversed by the administration of Baicalin, and similar result could also be observed in neurosphere assay in vitro. c-Caspase3 or γH2AX immunofluorescent staining and quantitative PCR showed that Baicalin administration alleviated HG-induced cell apoptosis and DNA damage. Bioinformatics results indicated that retinoic acid (RA) was likely to be the signaling pathway that Baicalin targeted on, and this was confirmed by whole-mount RALDH2 in situ hybridization and quantitative PCR of HH10 chick embryos in the absence/presence of Baicalin. In addition, blocking RA with an inhibitor abolished Baicalin's protective role in HG-induced NTDs, suppression of neurogenesis and cell proliferation, and induction of apoptosis, which further verified the centrality of RA in the process of Baicalin confronting HG-induced abnormal neurodevelopment.
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Affiliation(s)
- Guang Wang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Jia-Qi Lu
- Department of Ophthalmology, The First Affiliated Hospital of Jinan UniversityGuangzhou 510632, China
| | - Yong Ding
- Department of Ophthalmology, The First Affiliated Hospital of Jinan UniversityGuangzhou 510632, China
| | - Tonghua Zhang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Jin-Huan Song
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Denglu Long
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Jianxin Liang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Xin Cheng
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Zhenpeng Si
- Department of Pediatrics and Neonatology, Institute of Fetal-Preterm Labor Medicine, The First Affiliated Hospital, Jinan UniversityGuangzhou 510630, China
| | - Guolong Qi
- Division of Medical Information, Medical College, Jinan UniversityGuangzhou 510632, China
| | - Xiaohua Jiang
- Key Laboratory for Regenerative Medicine of The Ministry of Education of China, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong KongHong Kong SAR, China
| | - Xuesong Yang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan UniversityGuangzhou 510632, China
- Key Laboratory for Regenerative Medicine of The Ministry of Education, Jinan UniversityGuangzhou 510632, China
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12
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WDR34 mutation from anencephaly patients impaired both SHH and PCP signaling pathways. J Hum Genet 2020; 65:985-993. [PMID: 32576942 DOI: 10.1038/s10038-020-0793-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 06/11/2020] [Accepted: 06/11/2020] [Indexed: 12/16/2022]
Abstract
Neural tube defects (NTDs) are debilitating human congenital abnormalities due to failure of neural tube closure. Sonic Hedgehog (SHH) signaling is required for dorsal-ventral patterning of the neural tube. The loss of activation in SHH signaling normally causes holoprosencephaly while the loss of inhibition causes exencephaly due to failure in neural tube closure. WDR34 is a dynein intermedia chain component which is required for SHH activation. However, Wdr34 knockout mouse exhibit exencephaly. Here we screened mutations in WDR34 gene in 100 anencephaly patients of Chinese Han population. Compared to 1000 Genome Project data, two potentially disease causing missense mutations of WDR34 gene (c.1177G>A; p.G393S and c.1310A>G; p.Y437C) were identified in anencephaly patients. These two mutations did not affect the protein expression level of WDR34. Luciferase reporter and endogenous target gene expression level showed that both mutations are lose-of-function mutations in SHH signaling. Surprisingly, WDR34 could promote planar cell polarity (PCP) signaling and the G393S lost this promoting effect on PCP signaling. Morpholino knockdown of wdr34 in zebrafish caused severe convergent extension defects and pericardial abnormalities. The G393S mutant has less rescuing effects than both WT and Y437C WDR34 in zebrafish. Our results suggested that mutation in WDR34 could contribute to human NTDs by affecting both SHH and PCP signaling.
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13
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Tait CM, Chinnaiya K, Manning E, Murtaza M, Ashton JP, Furley N, Hill CJ, Alves CH, Wijnholds J, Erdmann KS, Furley A, Rashbass P, Das RM, Storey KG, Placzek M. Crumbs2 mediates ventricular layer remodelling to form the spinal cord central canal. PLoS Biol 2020; 18:e3000470. [PMID: 32150534 PMCID: PMC7108746 DOI: 10.1371/journal.pbio.3000470] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 03/31/2020] [Accepted: 02/18/2020] [Indexed: 11/27/2022] Open
Abstract
In the spinal cord, the central canal forms through a poorly understood process termed dorsal collapse that involves attrition and remodelling of pseudostratified ventricular layer (VL) cells. Here, we use mouse and chick models to show that dorsal ventricular layer (dVL) cells adjacent to dorsal midline Nestin(+) radial glia (dmNes+RG) down-regulate apical polarity proteins, including Crumbs2 (CRB2) and delaminate in a stepwise manner; live imaging shows that as one cell delaminates, the next cell ratchets up, the dmNes+RG endfoot ratchets down, and the process repeats. We show that dmNes+RG secrete a factor that promotes loss of cell polarity and delamination. This activity is mimicked by a secreted variant of Crumbs2 (CRB2S) which is specifically expressed by dmNes+RG. In cultured MDCK cells, CRB2S associates with apical membranes and decreases cell cohesion. Analysis of Crb2F/F/Nestin-Cre+/- mice, and targeted reduction of Crb2/CRB2S in slice cultures reveal essential roles for transmembrane CRB2 (CRB2TM) and CRB2S on VL cells and dmNes+RG, respectively. We propose a model in which a CRB2S-CRB2TM interaction promotes the progressive attrition of the dVL without loss of overall VL integrity. This novel mechanism may operate more widely to promote orderly progenitor delamination.
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Affiliation(s)
- Christine M Tait
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Kavitha Chinnaiya
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Elizabeth Manning
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Mariyam Murtaza
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - John-Paul Ashton
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Nicholas Furley
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Chris J Hill
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - C Henrique Alves
- Department of Ophthalmology, Leiden University Medical Centre, Leiden, the Netherlands
| | - Jan Wijnholds
- Department of Ophthalmology, Leiden University Medical Centre, Leiden, the Netherlands
| | - Kai S Erdmann
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Andrew Furley
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Penny Rashbass
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
| | - Raman M Das
- Division of Cell and Developmental Biology, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Kate G Storey
- Division of Cell and Developmental Biology, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Marysia Placzek
- Department of Biomedical Science and Bateson Centre, University of Sheffield, Sheffield, United Kingdom
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14
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Thouvenin O, Keiser L, Cantaut-Belarif Y, Carbo-Tano M, Verweij F, Jurisch-Yaksi N, Bardet PL, van Niel G, Gallaire F, Wyart C. Origin and role of the cerebrospinal fluid bidirectional flow in the central canal. eLife 2020; 9:e47699. [PMID: 31916933 PMCID: PMC6989091 DOI: 10.7554/elife.47699] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 01/07/2020] [Indexed: 12/22/2022] Open
Abstract
Circulation of the cerebrospinal fluid (CSF) contributes to body axis formation and brain development. Here, we investigated the unexplained origins of the CSF flow bidirectionality in the central canal of the spinal cord of 30 hpf zebrafish embryos and its impact on development. Experiments combined with modeling and simulations demonstrate that the CSF flow is generated locally by caudally-polarized motile cilia along the ventral wall of the central canal. The closed geometry of the canal imposes the average flow rate to be null, explaining the reported bidirectionality. We also demonstrate that at this early stage, motile cilia ensure the proper formation of the central canal. Furthermore, we demonstrate that the bidirectional flow accelerates the transport of particles in the CSF via a coupled convective-diffusive transport process. Our study demonstrates that cilia activity combined with muscle contractions sustain the long-range transport of extracellular lipidic particles, enabling embryonic growth.
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Affiliation(s)
- Olivier Thouvenin
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Universités, UPMC Univ Paris 06, Inserm, CNRS, AP-HP, Hôpital Pitié-SalpêtrièreParisFrance
- ESPCI Paris, PSL University, CNRS, Institut LangevinParisFrance
| | - Ludovic Keiser
- Laboratory of Fluid Mechanics and InstabilitiesÉcole Polytechnique Fédérale de LausanneLausanneSwitzerland
| | - Yasmine Cantaut-Belarif
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Universités, UPMC Univ Paris 06, Inserm, CNRS, AP-HP, Hôpital Pitié-SalpêtrièreParisFrance
| | - Martin Carbo-Tano
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Universités, UPMC Univ Paris 06, Inserm, CNRS, AP-HP, Hôpital Pitié-SalpêtrièreParisFrance
| | - Frederik Verweij
- Institute of Psychiatry and Neuroscience of Paris, Hôpital Saint-Anne, Université Descartes, INSERM U1266ParisFrance
| | - Nathalie Jurisch-Yaksi
- Kavli Institute for Systems Neuroscience, Centre for Neural Computation, The Faculty of MedicineNorwegian University of Science and TechnologyTrondheimNorway
- Department of Clinical and Molecular Medicine, The Faculty of MedicineNorwegian University of Science and TechnologyTrondheimNorway
| | - Pierre-Luc Bardet
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Universités, UPMC Univ Paris 06, Inserm, CNRS, AP-HP, Hôpital Pitié-SalpêtrièreParisFrance
| | - Guillaume van Niel
- Institute of Psychiatry and Neuroscience of Paris, Hôpital Saint-Anne, Université Descartes, INSERM U1266ParisFrance
| | - Francois Gallaire
- Laboratory of Fluid Mechanics and InstabilitiesÉcole Polytechnique Fédérale de LausanneLausanneSwitzerland
| | - Claire Wyart
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Universités, UPMC Univ Paris 06, Inserm, CNRS, AP-HP, Hôpital Pitié-SalpêtrièreParisFrance
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15
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Rgma-Induced Neo1 Proteolysis Promotes Neural Tube Morphogenesis. J Neurosci 2019; 39:7465-7484. [PMID: 31399534 DOI: 10.1523/jneurosci.3262-18.2019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 07/01/2019] [Accepted: 07/31/2019] [Indexed: 01/02/2023] Open
Abstract
Neuroepithelial cell (NEC) elongation is one of several key cell behaviors that mediate the tissue-level morphogenetic movements that shape the neural tube (NT), the precursor of the brain and spinal cord. However, the upstream signals that promote NEC elongation have been difficult to tease apart from those regulating apico-basal polarity and hingepoint formation, due to their confounding interdependence. The Repulsive Guidance Molecule a (Rgma)/Neogenin 1 (Neo1) signaling pathway plays a conserved role in NT formation (neurulation) and is reported to regulate both NEC elongation and apico-basal polarity, through signal transduction events that have not been identified. We examine here the role of Rgma/Neo1 signaling in zebrafish (sex unknown), an organism that does not use hingepoints to shape its hindbrain, thereby enabling a direct assessment of the role of this pathway in NEC elongation. We confirm that Rgma/Neo1 signaling is required for microtubule-mediated NEC elongation, and demonstrate via cell transplantation that Neo1 functions cell autonomously to promote elongation. However, in contrast to previous findings, our data do not support a role for this pathway in establishing apical junctional complexes. Last, we provide evidence that Rgma promotes Neo1 glycosylation and intramembrane proteolysis, resulting in the production of a transient, nuclear intracellular fragment (NeoICD). Partial rescue of Neo1a and Rgma knockdown embryos by overexpressing neoICD suggests that this proteolytic cleavage is essential for neurulation. Based on these observations, we propose that RGMA-induced NEO1 proteolysis orchestrates NT morphogenesis by promoting NEC elongation independently of the establishment of apical junctional complexes.SIGNIFICANCE STATEMENT The neural tube, the CNS precursor, is shaped during neurulation. Neural tube defects occur frequently, yet underlying genetic risk factors are poorly understood. Neuroepithelial cell (NEC) elongation is essential for proper completion of neurulation. Thus, connecting NEC elongation with the molecular pathways that control this process is expected to reveal novel neural tube defect risk factors and increase our understanding of NT development. Effectors of cell elongation include microtubules and microtubule-associated proteins; however, upstream regulators remain controversial due to the confounding interdependence of cell elongation and establishment of apico-basal polarity. Here, we reveal that Rgma-Neo1 signaling controls NEC elongation independently of the establishment of apical junctional complexes and identify Rgma-induced Neo1 proteolytic cleavage as a key upstream signaling event.
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16
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Notch-mediated inhibition of neurogenesis is required for zebrafish spinal cord morphogenesis. Sci Rep 2019; 9:9958. [PMID: 31292468 PMCID: PMC6620349 DOI: 10.1038/s41598-019-46067-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 06/18/2019] [Indexed: 12/26/2022] Open
Abstract
The morphogenesis of the nervous system requires coordinating the specification and differentiation of neural precursor cells, the establishment of neuroepithelial tissue architecture and the execution of specific cellular movements. How these aspects of neural development are linked is incompletely understood. Here we inactivate a major regulator of embryonic neurogenesis - the Delta/Notch pathway - and analyze the effect on zebrafish central nervous system morphogenesis. While some parts of the nervous system can establish neuroepithelial tissue architecture independently of Notch, Notch signaling is essential for spinal cord morphogenesis. In this tissue, Notch signaling is required to repress neuronal differentiation and allow thereby the emergence of neuroepithelial apico-basal polarity. Notch-mediated suppression of neurogenesis is also essential for the execution of specific morphogenetic movements of zebrafish spinal cord precursor cells. In the wild-type neural tube, cells divide at the organ midline to contribute one daughter cell to each organ half. Notch signaling deficient animals fail to display this behavior and therefore form a misproportioned spinal cord. Taken together, our findings show that Notch-mediated suppression of neurogenesis is required to allow the execution of morphogenetic programs that shape the zebrafish spinal cord.
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17
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Visetsouk MR, Falat EJ, Garde RJ, Wendlick JL, Gutzman JH. Basal epithelial tissue folding is mediated by differential regulation of microtubules. Development 2018; 145:dev.167031. [PMID: 30333212 PMCID: PMC6262788 DOI: 10.1242/dev.167031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 10/09/2018] [Indexed: 01/02/2023]
Abstract
The folding of epithelial tissues is crucial for development of three-dimensional structure and function. Understanding this process can assist in determining the etiology of developmental disease and engineering of tissues for the future of regenerative medicine. Folding of epithelial tissues towards the apical surface has long been studied, but the molecular mechanisms that mediate epithelial folding towards the basal surface are just emerging. Here, we utilize zebrafish neuroepithelium to identify mechanisms that mediate basal tissue folding to form the highly conserved embryonic midbrain-hindbrain boundary. Live imaging revealed Wnt5b as a mediator of anisotropic epithelial cell shape, both apically and basally. In addition, we uncovered a Wnt5b-mediated mechanism for specific regulation of basal anisotropic cell shape that is microtubule dependent and likely to involve JNK signaling. We propose a model in which a single morphogen can differentially regulate apical versus basal cell shape during tissue morphogenesis. Summary: Examination of cell shape changes during zebrafish neuroepithelium tissue folding reveals that Wnt5b specifically regulates basal anisotropic cell shape via a microtubule-dependent mechanism, likely involving JNK signaling.
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Affiliation(s)
- Mike R Visetsouk
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, 53201, USA
| | - Elizabeth J Falat
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, 53201, USA
| | - Ryan J Garde
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, 53201, USA
| | - Jennifer L Wendlick
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, 53201, USA
| | - Jennifer H Gutzman
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, 53201, USA
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18
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Cytoplasmic localization of GRHL3 upon epidermal differentiation triggers cell shape change for epithelial morphogenesis. Nat Commun 2018; 9:4059. [PMID: 30283008 PMCID: PMC6170465 DOI: 10.1038/s41467-018-06171-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 08/16/2018] [Indexed: 11/08/2022] Open
Abstract
Epithelial cell shape change is a pivotal driving force for morphogenesis of complex three-dimensional architecture. However, molecular mechanisms triggering shape changes of epithelial cells in the course of growth and differentiation have not been entirely elucidated. Grhl3 plays a crucial role as a downstream transcription factor of Wnt/β-catenin in epidermal differentiation. Here, we show Grhl3 induced large, mature epidermal cells, enriched with actomyosin networks, from embryoid bodies in vitro. Such epidermal cells were apparently formed by the simultaneous activation of canonical and non-canonical Wnt signaling pathways. A nuclear transcription factor, GRHL3 is localized in the cytoplasm and cell membrane during epidermal differentiation. Subsequently, such extranuclear GRHL3 is essential for the membrane-associated expression of VANGL2 and CELSR1. Cytoplasmic GRHL3, thereby, allows epidermal cells to acquire mechanical properties for changes in epithelial cell shape. Thus, we propose that cytoplasmic localization of GRHL3 upon epidermal differentiation directly triggers epithelial morphogenesis.
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19
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Wen Q, Mruk D, Tang EI, Wong CK, Lui WY, Lee WM, Xiao X, Silvestrini B, Cheng CY. Cell polarity and cytoskeletons-Lesson from the testis. Semin Cell Dev Biol 2018; 81:21-32. [PMID: 28965865 PMCID: PMC5889362 DOI: 10.1016/j.semcdb.2017.09.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 09/28/2017] [Indexed: 12/23/2022]
Abstract
Cell polarity in the adult mammalian testis refers to the polarized alignment of developing spermatids during spermiogenesis and the polarized organization of organelles (e.g., phagosomes, endocytic vesicles, Sertoli cell nuclei, Golgi apparatus) in Sertoli cells and germ cells to support spermatogenesis. Without these distinctive features of cell polarity in the seminiferous epithelium, it is not possible to support the daily production of millions of sperm in the limited space provided by the seminiferous tubules in either rodent or human males through the adulthood. In short, cell polarity provides a novel mean to align spermatids and the supporting organelles (e.g., phagosomes, Golgi apparatus, endocytic vesicles) in a highly organized fashion spatially in the seminiferous epithelium during the epithelial cycle of spermatogenesis. This is analogous to different assembling units in a manufacturing plant such that as developing spermatids move along the "assembly line" conferred by Sertoli cells, different structural/functional components can be added to (or removed from) the developing spermatids during spermiogenesis, so that functional spermatozoa are produced at the end of the assembly line. Herein, we briefly review findings regarding the regulation of cell polarity in the testis with specific emphasis on developing spermatids, supported by an intriguing network of regulatory proteins along a local functional axis. Emerging evidence has suggested that cell cytoskeletons provide the tracks which in turn confer the unique assembly lines in the seminiferous epithelium. We also provide some thought-provoking concepts based on which functional experiments can be designed in future studies.
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Affiliation(s)
- Qing Wen
- The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, 1230 York Ave, New York, New York 10065
| | - Dolores Mruk
- The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, 1230 York Ave, New York, New York 10065
| | - Elizabeth I. Tang
- The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, 1230 York Ave, New York, New York 10065
| | - Chris K.C. Wong
- Department of Biology, Hong Kong Baptist University, Hong Kong, China
| | - Wing-yee Lui
- School of Biological Sciences, University of Hong Kong, Hong Kong, China
| | - Will M. Lee
- School of Biological Sciences, University of Hong Kong, Hong Kong, China
| | - Xiang Xiao
- Department of Reproductive Physiology, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, China
| | | | - C. Yan Cheng
- The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, 1230 York Ave, New York, New York 10065
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20
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Bedoshvili Y, Gneusheva K, Popova M, Morozov A, Likhoshway Y. Anomalies in the valve morphogenesis of the centric diatom alga Aulacoseira islandica caused by microtubule inhibitors. Biol Open 2018; 7:bio035519. [PMID: 30037970 PMCID: PMC6124563 DOI: 10.1242/bio.035519] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 07/16/2018] [Indexed: 11/20/2022] Open
Abstract
Of all unicellular organisms possessing a cell wall, diatoms are the most adept at micro- and nanoscale embellishment of their frustules. Elements of their cell walls are formed inside the cell under cytoskeletal control. In this work, we used laser scanning microscopy and electron microscopy to describe the major stages of cell wall formation in the centric diatom algae Aulacoseira islandica and to study the effect of various microtubule inhibitors on the morphogenesis of frustule elements. Our results show that colchicine inhibits karyokinesis and cytokinesis in A. islandica colonies. In contrast, valve morphogenesis is changed, rather than inhibited altogether. In normal cells, this process starts simultaneously in both daughter cells, beginning with the formation of two adjacent discs that later become valve faces and connecting spines. Under colchicine treatment, however, the cleavage furrow is blocked and a single lateral valve forms on the side of the cylindrical frustule. As a result, a single hollow pipe forms instead of two separate drinking glass-shaped frustules; such pipes can form up to 35% of all forming frustules. Colchicine inhibits the formation of connecting spines, whereas paclitaxel causes spines to form a complex, branching shape. At the same time, inhibitors do not affect the formation of areolae (openings) in the frustule. We discuss the possibility that various processes of the diatom frustule morphogenesis are controlled by two different mechanisms: membrane-related micromorphogenesis and cytoskeleton-mediated macromorphogenesis.
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Affiliation(s)
- Yekaterina Bedoshvili
- Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia
| | - Ksenia Gneusheva
- Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia
| | - Maria Popova
- Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia
| | - Alexey Morozov
- Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia
| | - Yelena Likhoshway
- Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia
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21
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Hessel EVS, Staal YCM, Piersma AH. Design and validation of an ontology-driven animal-free testing strategy for developmental neurotoxicity testing. Toxicol Appl Pharmacol 2018; 354:136-152. [PMID: 29544899 DOI: 10.1016/j.taap.2018.03.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 02/26/2018] [Accepted: 03/11/2018] [Indexed: 12/26/2022]
Abstract
Developmental neurotoxicity entails one of the most complex areas in toxicology. Animal studies provide only limited information as to human relevance. A multitude of alternative models have been developed over the years, providing insights into mechanisms of action. We give an overview of fundamental processes in neural tube formation, brain development and neural specification, aiming at illustrating complexity rather than comprehensiveness. We also give a flavor of the wealth of alternative methods in this area. Given the impressive progress in mechanistic knowledge of human biology and toxicology, the time is right for a conceptual approach for designing testing strategies that cover the integral mechanistic landscape of developmental neurotoxicity. The ontology approach provides a framework for defining this landscape, upon which an integral in silico model for predicting toxicity can be built. It subsequently directs the selection of in vitro assays for rate-limiting events in the biological network, to feed parameter tuning in the model, leading to prediction of the toxicological outcome. Validation of such models requires primary attention to coverage of the biological domain, rather than classical predictive value of individual tests. Proofs of concept for such an approach are already available. The challenge is in mining modern biology, toxicology and chemical information to feed intelligent designs, which will define testing strategies for neurodevelopmental toxicity testing.
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Affiliation(s)
- Ellen V S Hessel
- Center for Health Protection, National Institute for Public Health and The Environment (RIVM), P.O. Box 1, 3720BA Bilthoven, The Netherlands.
| | - Yvonne C M Staal
- Center for Health Protection, National Institute for Public Health and The Environment (RIVM), P.O. Box 1, 3720BA Bilthoven, The Netherlands
| | - Aldert H Piersma
- Center for Health Protection, National Institute for Public Health and The Environment (RIVM), P.O. Box 1, 3720BA Bilthoven, The Netherlands; Institute for Risk Assessment Sciences (IRAS), Utrecht University, Utrecht, The Netherlands
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22
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Kreitzer G, Myat MM. Microtubule Motors in Establishment of Epithelial Cell Polarity. Cold Spring Harb Perspect Biol 2018; 10:cshperspect.a027896. [PMID: 28264820 DOI: 10.1101/cshperspect.a027896] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Epithelial cells play a key role in insuring physiological homeostasis by acting as a barrier between the outside environment and internal organs. They are also responsible for the vectorial transport of ions and fluid essential to the function of many organs. To accomplish these tasks, epithelial cells must generate an asymmetrically organized plasma membrane comprised of structurally and functionally distinct apical and basolateral membranes. Adherent and occluding junctions, respectively, anchor cells within a layer and prevent lateral diffusion of proteins in the outer leaflet of the plasma membrane and restrict passage of proteins and solutes through intercellular spaces. At a fundamental level, the establishment and maintenance of epithelial polarity requires that signals initiated at cell-substratum and cell-cell adhesions are transmitted appropriately and dynamically to the cytoskeleton, to the membrane-trafficking machinery, and to the regulation of occluding and adherent junctions. Rigorous descriptive and mechanistic studies published over the last 50 years have provided great detail to our understanding of epithelial polarization. Yet still, critical early steps in morphogenesis are not yet fully appreciated. In this review, we discuss how cytoskeletal motor proteins, primarily kinesins, contribute to coordinated modification of microtubule and actin arrays, formation and remodeling of cell adhesions to targeted membrane trafficking, and to initiating the formation and expansion of an apical lumen.
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Affiliation(s)
- Geri Kreitzer
- Department of Pathobiology, Sophie Davis School of Biomedical Education, City College of New York, The City University of New York School of Medicine, New York, New York 10031
| | - Monn Monn Myat
- Department of Biology, Medgar Evers College, Brooklyn, New York 11225.,The Graduate Center, The City University of New York, New York, New York 10016
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23
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Howes SC, Geyer EA, LaFrance B, Zhang R, Kellogg EH, Westermann S, Rice LM, Nogales E. Structural and functional differences between porcine brain and budding yeast microtubules. Cell Cycle 2018; 17:278-287. [PMID: 29278985 PMCID: PMC5914886 DOI: 10.1080/15384101.2017.1415680] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The cytoskeleton of eukaryotic cells relies on microtubules to perform many essential functions. We have previously shown that, in spite of the overall conservation in sequence and structure of tubulin subunits across species, there are differences between mammalian and budding yeast microtubules with likely functional consequences for the cell. Here we expand our structural and function comparison of yeast and porcine microtubules to show different distribution of protofilament number in microtubules assembled in vitro from these two species. The different geometry at lateral contacts between protofilaments is likely due to a more polar interface in yeast. We also find that yeast tubulin forms longer and less curved oligomers in solution, suggesting stronger tubulin:tubulin interactions along the protofilament. Finally, we observed species-specific plus-end tracking activity for EB proteins: yeast Bim1 tracked yeast but not mammalian MTs, and human EB1 tracked mammalian but not yeast MTs. These findings further demonstrate that subtle sequence differences in tubulin sequence can have significant structural and functional consequences in microtubule structure and behavior.
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Affiliation(s)
- Stuart C Howes
- a Biophysics Graduate Group , UC Berkeley , CA 94720 , USA and Department of Molecular Cell Biology , Leiden University Medical Center , 2333 ZC Leiden , Netherlands
| | - Elisabeth A Geyer
- b UT Southwestern Medical Center , Departments of Biophysics and Biochemistry , Dallas , TX 75390 , USA
| | - Benjamin LaFrance
- c Molecular and Cell Biology Graduate Program , UC Berkeley , CA 94720 , USA
| | - Rui Zhang
- d Molecular Biophysics and Integrated Bioimaging , Lawrence Berkeley National Laboratory , CA 94720 , USA.,e Howard Hughes Medical Institute , UC Berkeley , CA 94720-3220 , USA.,f Department of Biochemistry and Molecular Biophysics , Washington University School of Medicine , St. Louis , MO 63110 , USA
| | - Elizabeth H Kellogg
- d Molecular Biophysics and Integrated Bioimaging , Lawrence Berkeley National Laboratory , CA 94720 , USA.,e Howard Hughes Medical Institute , UC Berkeley , CA 94720-3220 , USA
| | - Stefan Westermann
- g Research Institute of Molecular Pathology , Dr. Bohr-Gasse 7, 1030 Vienna , Austria
| | - Luke M Rice
- b UT Southwestern Medical Center , Departments of Biophysics and Biochemistry , Dallas , TX 75390 , USA
| | - Eva Nogales
- d Molecular Biophysics and Integrated Bioimaging , Lawrence Berkeley National Laboratory , CA 94720 , USA.,e Howard Hughes Medical Institute , UC Berkeley , CA 94720-3220 , USA.,h Molecular and Cell Biology Department and QB3 Institute , UC Berkeley , CA 94720 , USA
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24
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Tricaud N. Myelinating Schwann Cell Polarity and Mechanically-Driven Myelin Sheath Elongation. Front Cell Neurosci 2018; 11:414. [PMID: 29354031 PMCID: PMC5760505 DOI: 10.3389/fncel.2017.00414] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/11/2017] [Indexed: 11/13/2022] Open
Abstract
Myelin sheath geometry, encompassing myelin sheath thickness relative to internodal length, is critical to optimize nerve conduction velocity and these parameters are carefully adjusted by the myelinating cells in mammals. In the central nervous system these adjustments could regulate neuronal activities while in the peripheral nervous system they lead to the optimization and the reliability of the nerve conduction velocity. However, the physiological and cellular mechanisms that underlie myelin sheath geometry regulation are not yet fully elucidated. In peripheral nerves the myelinating Schwann cell uses several molecular mechanisms to reach and maintain the correct myelin sheath geometry, such that myelin sheath thickness and internodal length are regulated independently. One of these mechanisms is the epithelial-like cell polarization process that occurs during the early phases of the myelin biogenesis. Epithelial cell polarization factors are known to control cell size and morphology in invertebrates and mammals making these processes critical in the organogenesis. Correlative data indicate that internodal length is regulated by postnatal body growth that elongates peripheral nerves in mammals. In addition, the mechanical stretching of peripheral nerves in adult animals shows that myelin sheath length can be increased by mechanical cues. Recent results describe the important role of YAP/TAZ co-transcription factors during Schwann cell myelination and their functions have linked to the mechanotransduction through the HIPPO pathway and the epithelial polarity factor Crb3. In this review the molecular mechanisms that govern mechanically-driven myelin sheath elongation and how a Schwann cell can modulate internodal myelin sheath length, independent of internodal thickness, will be discussed regarding these recent data. In addition, the potential relevance of these mechanosensitive mechanisms in peripheral pathologies will be highlighted.
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Affiliation(s)
- Nicolas Tricaud
- Institut National de la Santé et de la Recherche Médicale, Institut des Neurosciences de Montpellier, Université de Montpellier, Montpellier, France
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25
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hmmr mediates anterior neural tube closure and morphogenesis in the frog Xenopus. Dev Biol 2017; 430:188-201. [PMID: 28778799 DOI: 10.1016/j.ydbio.2017.07.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 07/19/2017] [Accepted: 07/26/2017] [Indexed: 12/20/2022]
Abstract
Development of the central nervous system requires orchestration of morphogenetic processes which drive elevation and apposition of the neural folds and their fusion into a neural tube. The newly formed tube gives rise to the brain in anterior regions and continues to develop into the spinal cord posteriorly. Conspicuous differences between the anterior and posterior neural tube become visible already during neural tube closure (NTC). Planar cell polarity (PCP)-mediated convergent extension (CE) movements are restricted to the posterior neural plate, i.e. hindbrain and spinal cord, where they propagate neural fold apposition. The lack of CE in the anterior neural plate correlates with a much slower mode of neural fold apposition anteriorly. The morphogenetic processes driving anterior NTC have not been addressed in detail. Here, we report a novel role for the breast cancer susceptibility gene and microtubule (MT) binding protein Hmmr (Hyaluronan-mediated motility receptor, RHAMM) in anterior neurulation and forebrain development in Xenopus laevis. Loss of hmmr function resulted in a lack of telencephalic hemisphere separation, arising from defective roof plate formation, which in turn was caused by impaired neural tissue narrowing. hmmr regulated polarization of neural cells, a function which was dependent on the MT binding domains. hmmr cooperated with the core PCP component vangl2 in regulating cell polarity and neural morphogenesis. Disrupted cell polarization and elongation in hmmr and vangl2 morphants prevented radial intercalation (RI), a cell behavior essential for neural morphogenesis. Our results pinpoint a novel role of hmmr in anterior neural development and support the notion that RI is a major driving force for anterior neurulation and forebrain morphogenesis.
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26
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Genetic and Molecular Approaches to Study Neuronal Migration in the Developing Cerebral Cortex. Brain Sci 2017; 7:brainsci7050053. [PMID: 28475113 PMCID: PMC5447935 DOI: 10.3390/brainsci7050053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 04/21/2017] [Accepted: 05/02/2017] [Indexed: 11/17/2022] Open
Abstract
The migration of neuronal cells in the developing cerebral cortex is essential for proper development of the brain and brain networks. Disturbances in this process, due to genetic abnormalities or exogenous factors, leads to aberrant brain formation, brain network formation, and brain function. In the last decade, there has been extensive research in the field of neuronal migration. In this review, we describe different methods and approaches to assess and study neuronal migration in the developing cerebral cortex. First, we discuss several genetic methods, techniques and genetic models that have been used to study neuronal migration in the developing cortex. Second, we describe several molecular approaches to study aberrant neuronal migration in the cortex which can be used to elucidate the underlying mechanisms of neuronal migration. Finally, we describe model systems to investigate and assess the potential toxicity effect of prenatal exposure to environmental chemicals on proper brain formation and neuronal migration.
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27
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Toriyama M, Toriyama M, Wallingford JB, Finnell RH. Folate-dependent methylation of septins governs ciliogenesis during neural tube closure. FASEB J 2017; 31:3622-3635. [PMID: 28432198 DOI: 10.1096/fj.201700092r] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 04/11/2017] [Indexed: 12/15/2022]
Abstract
Periconception maternal folic acid (vitamin B9) supplementation can reduce the prevalence of neural tube defects (NTDs), although just how folates benefit the developing embryo and promote closing of the neural tube and other morphologic processes during development remains unknown. Folate contributes to a 1-carbon metabolism, which is essential for purine biosynthesis and methionine recycling and affects methylation of DNA, histones, and nonhistone proteins. Herein, we used animal models and cultured mammalian cells to demonstrate that disruption of the methylation pathway mediated by folate compromises normal neural tube closure (NTC) and ciliogenesis. We demonstrate that the embryos with NTD failed to adequately methylate septin2, a key regulator of cilium structure and function. We report that methylation of septin2 affected its GTP binding activity and formation of the septin2-6-7 complex. We propose that folic acid promotes normal NTC in some embryos by regulating the methylation of septin2, which is critical for normal cilium formation during early embryonic development.-Toriyama, M., Toriyama, M., Wallingford, J. B., Finnell, R. H. Folate-dependent methylation of septins governs ciliogenesis during neural tube closure.
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Affiliation(s)
- Manami Toriyama
- Department of Pediatrics, Dell Pediatric Research Institute, The University of Texas at Austin Dell Medical School, Austin, Texas, USA
| | - Michinori Toriyama
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, USA
| | - John B Wallingford
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, USA
| | - Richard H Finnell
- Department of Pediatrics, Dell Pediatric Research Institute, The University of Texas at Austin Dell Medical School, Austin, Texas, USA;
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28
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Breuss MW, Leca I, Gstrein T, Hansen AH, Keays DA. Tubulins and brain development - The origins of functional specification. Mol Cell Neurosci 2017; 84:58-67. [PMID: 28347630 DOI: 10.1016/j.mcn.2017.03.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 02/28/2017] [Accepted: 03/05/2017] [Indexed: 10/19/2022] Open
Abstract
The development of the vertebrate central nervous system is reliant on a complex cascade of biological processes that include mitotic division, relocation of migrating neurons, and the extension of dendritic and axonal processes. Each of these cellular events requires the diverse functional repertoire of the microtubule cytoskeleton for the generation of forces, assembly of macromolecular complexes and transport of molecules and organelles. The tubulins are a multi-gene family that encode for the constituents of microtubules, and have been implicated in a spectrum of neurological disorders. Evidence is building that different tubulins tune the functional properties of the microtubule cytoskeleton dependent on the cell type, developmental profile and subcellular localisation. Here we review of the origins of the functional specification of the tubulin gene family in the developing brain at a transcriptional, translational, and post-transcriptional level. We remind the reader that tubulins are not just loading controls for your average Western blot.
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Affiliation(s)
- Martin W Breuss
- Department of Neurosciences, University of California, San Diego, La Jolla, CA 92093, USA
| | - Ines Leca
- Research Institute of Molecular Pathology, Vienna Biocenter (VBC), Dr Bohr-Gasse 7, Vienna 1030, Austria
| | - Thomas Gstrein
- Research Institute of Molecular Pathology, Vienna Biocenter (VBC), Dr Bohr-Gasse 7, Vienna 1030, Austria
| | - Andi H Hansen
- Research Institute of Molecular Pathology, Vienna Biocenter (VBC), Dr Bohr-Gasse 7, Vienna 1030, Austria; Institute of Science and Technology Austria, Klosterneuburg 3400, Austria
| | - David A Keays
- Research Institute of Molecular Pathology, Vienna Biocenter (VBC), Dr Bohr-Gasse 7, Vienna 1030, Austria.
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29
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Molina A, Pituello F. Playing with the cell cycle to build the spinal cord. Dev Biol 2016; 432:14-23. [PMID: 28034699 DOI: 10.1016/j.ydbio.2016.12.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 12/14/2016] [Accepted: 12/20/2016] [Indexed: 12/31/2022]
Abstract
A fundamental issue in nervous system development and homeostasis is to understand the mechanisms governing the balance between the maintenance of proliferating progenitors versus their differentiation into post-mitotic neurons. Accumulating data suggest that the cell cycle and core regulators of the cell cycle machinery play a major role in regulating this fine balance. Here, we focus on the interplay between the cell cycle and cellular and molecular events governing spinal cord development. We describe the existing links between the cell cycle and interkinetic nuclear migration (INM). We show how the different morphogens patterning the neural tube also regulate the cell cycle machinery to coordinate proliferation and patterning. We give examples of how cell cycle core regulators regulate transcriptionally, or post-transcriptionally, genes involved in controlling the maintenance versus the differentiation of neural progenitors. Finally, we describe the changes in cell cycle kinetics occurring during neural tube patterning and at the time of neuronal differentiation, and we discuss future research directions to better understand the role of the cell cycle in cell fate decisions.
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Affiliation(s)
- Angie Molina
- Centre de Biologie du Développement (CBD), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, France.
| | - Fabienne Pituello
- Centre de Biologie du Développement (CBD), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, France.
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30
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Liu M, Wang G, Zhang SY, Zhong S, Qi GL, Wang CJ, Chuai M, Lee KKH, Lu DX, Yang X. From the Cover: Exposing Imidacloprid Interferes With Neurogenesis Through Impacting on Chick Neural Tube Cell Survival. Toxicol Sci 2016; 153:137-148. [DOI: 10.1093/toxsci/kfw111] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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31
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Hang XY, Shang AJ, Zhao QJ, Bai SC, Cheng C, Tao BZ, Wang LK, Liang S, Yin L. Association between chromosomal aberration of COX8C and tethered spinal cord syndrome: array-based comparative genomic hybridization analysis. Neural Regen Res 2016; 11:1333-8. [PMID: 27651783 PMCID: PMC5020834 DOI: 10.4103/1673-5374.189200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Copy number variations have been found in patients with neural tube abnormalities. In this study, we performed genome-wide screening using high-resolution array-based comparative genomic hybridization in three children with tethered spinal cord syndrome and two healthy parents. Of eight copy number variations, four were non-polymorphic. These non-polymorphic copy number variations were associated with Angelman and Prader-Willi syndromes, and microcephaly. Gene function enrichment analysis revealed that COX8C, a gene associated with metabolic disorders of the nervous system, was located in the copy number variation region of Patient 1. Our results indicate that array-based comparative genomic hybridization can be used to diagnose tethered spinal cord syndrome. Our results may help determine the pathogenesis of tethered spinal cord syndrome and prevent occurrence of this disease.
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