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Champeris Tsaniras S, Delinasios GJ, Petropoulos M, Panagopoulos A, Anagnostopoulos AK, Villiou M, Vlachakis D, Bravou V, Stathopoulos GT, Taraviras S. DNA Replication Inhibitor Geminin and Retinoic Acid Signaling Participate in Complex Interactions Associated With Pluripotency. Cancer Genomics Proteomics 2019; 16:593-601. [PMID: 31659113 PMCID: PMC6885373 DOI: 10.21873/cgp.20162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 09/23/2019] [Accepted: 10/10/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND/AIM Several links between DNA replication, pluripotency and development have been recently identified. The involvement of miRNA in the regulation of cell cycle events and pluripotency factors has also gained attention. MATERIALS AND METHODS In the present study, we used the g:Profiler platform to analyze transcription factor binding sites, miRNA networks and protein-protein interactions to identify novel links among the aforementioned processes. RESULTS AND CONCLUSION A complex circuitry between retinoic acid signaling, SWI/SNF components, pluripotency factors including Oct4, Sox2 and Nanog and cell cycle regulators was identified. It is suggested that the DNA replication inhibitor geminin plays a central role in this circuitry.
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Affiliation(s)
- Spyridon Champeris Tsaniras
- Department of Physiology, Medical School, University of Patras, Patras, Greece
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, U.S.A
| | | | | | | | - Athanasios K Anagnostopoulos
- International Institute of Anticancer Research, Kapandriti, Greece
- Proteomics Research Unit, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Maria Villiou
- Department of Physiology, Medical School, University of Patras, Patras, Greece
| | - Dimitrios Vlachakis
- Bioinformatics & Medical Informatics Laboratory, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Vasiliki Bravou
- Department of Anatomy-Histology-Embryology, Faculty of Medicine, University of Patras, Patras, Greece
| | - Georgios T Stathopoulos
- Laboratory for Molecular Respiratory Carcinogenesis, Department of Physiology, Faculty of Medicine, University of Patras, Patras, Greece
| | - Stavros Taraviras
- Department of Physiology, Medical School, University of Patras, Patras, Greece
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Migration and diversification of the vagal neural crest. Dev Biol 2018; 444 Suppl 1:S98-S109. [PMID: 29981692 DOI: 10.1016/j.ydbio.2018.07.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 07/03/2018] [Accepted: 07/03/2018] [Indexed: 12/17/2022]
Abstract
Arising within the neural tube between the cranial and trunk regions of the body axis, the vagal neural crest shares interesting similarities in its migratory routes and derivatives with other neural crest populations. However, the vagal neural crest is also unique in its ability to contribute to diverse organs including the heart and enteric nervous system. This review highlights the migratory routes of the vagal neural crest and compares them across multiple vertebrates. We also summarize recent advances in understanding vagal neural crest ontogeny and discuss the contribution of this important neural crest population to the cardiovascular system and endoderm-derived organs, including the thymus, lungs and pancreas.
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Investigation of the expression of apoptosis-inducing factor-mediated apoptosis in Hirschsprung's disease. Neuroreport 2018; 28:571-578. [PMID: 28562483 DOI: 10.1097/wnr.0000000000000798] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
One of the widely accepted hypotheses of Hirschsprung's disease (HD) is that the absence of ganglion cells in the distal part of the intestine is caused by the death of enteric neural crest-derived cells following migration. Although a caspase-dependent pathway has not yet been detected in the HD bowel, it is unclear whether a caspase-independent pathway contributes toward aganglionosis. In the current study, we observed highly condensed marginal heterochromatin in nuclei only in the transitional segment using electron microscopy and a high proportion of TUNEL-positive cells were observed in the transitional segment. Activation of caspase was not observed in any segments of the HD bowel upon characterization of the apoptotic pathway. Rather, real-time PCR results showed that apoptosis-inducing factor (AIF) and calpain-1 mRNAs were highly expressed in the transitional segment, whereas autophagy protein 5 (Atg5) was highly expressed in the narrow segment. Western blot results were consistent with mRNA levels, with increased AIF, calpain-1, and Atg5 expressions in the transitional segment compared with the dilated segment. Furthermore, correlation analysis indicated an inverse correlation between calpain-1 and Atg5 mRNA levels in both the narrow segment and the transitional segment. These results indicated that apoptosis occurs in the HD bowel. The detection of related genes indicates that the AIF-mediated apoptotic pathway may be responsible for the absence of ganglion cells in HD and calpain-1 may act as the regulatory switch between autophagy and apoptosis.
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Arbi M, Pefani DE, Taraviras S, Lygerou Z. Controlling centriole numbers: Geminin family members as master regulators of centriole amplification and multiciliogenesis. Chromosoma 2017; 127:151-174. [PMID: 29243212 DOI: 10.1007/s00412-017-0652-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 11/06/2017] [Accepted: 11/07/2017] [Indexed: 01/18/2023]
Abstract
To ensure that the genetic material is accurately passed down to daughter cells during mitosis, dividing cells must duplicate their chromosomes and centrosomes once and only once per cell cycle. The same key steps-licensing, duplication, and segregation-control both the chromosome and the centrosome cycle, which must occur in concert to safeguard genome integrity. Aberrations in genome content or centrosome numbers lead to genomic instability and are linked to tumorigenesis. Such aberrations, however, can also be part of the normal life cycle of specific cell types. Multiciliated cells best exemplify the deviation from a normal centrosome cycle. They are post-mitotic cells which massively amplify their centrioles, bypassing the rule for once-per-cell-cycle centriole duplication. Hundreds of centrioles dock to the apical cell surface and generate motile cilia, whose concerted movement ensures fluid flow across epithelia. The early steps that control the generation of multiciliated cells have lately started to be elucidated. Geminin and the vertebrate-specific GemC1 and McIdas are distantly related coiled-coil proteins, initially identified as cell cycle regulators associated with the chromosome cycle. Geminin is required to ensure once-per-cell-cycle genome replication, while McIdas and GemC1 bind to Geminin and are implicated in DNA replication control. Recent findings highlight Geminin family members as early regulators of multiciliogenesis. GemC1 and McIdas specify the multiciliate cell fate by forming complexes with the E2F4/5 transcription factors to switch on a gene expression program leading to centriole amplification and cilia formation. Positive and negative interactions among Geminin family members may link cell cycle control to centriole amplification and multiciliogenesis, acting close to the point of transition from proliferation to differentiation. We review key steps of centrosome duplication and amplification, present the role of Geminin family members in the centrosome and chromosome cycle, and discuss links with disease.
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Affiliation(s)
- Marina Arbi
- Laboratory of Biology, School of Medicine, University of Patras, 26504 Rio, Patras, Greece
| | - Dafni-Eleftheria Pefani
- Laboratory of Biology, School of Medicine, University of Patras, 26504 Rio, Patras, Greece.,CRUK/MRC Oxford Institute, Department of Oncology, University of Oxford, Oxford, OX3 7DQ, UK
| | - Stavros Taraviras
- Laboratory of Physiology, School of Medicine, University of Patras, 26504 Rio, Patras, Greece
| | - Zoi Lygerou
- Laboratory of Biology, School of Medicine, University of Patras, 26504 Rio, Patras, Greece.
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Taouki I, Tasiudi E, Lalioti ME, Kyrousi C, Skavatsou E, Kaplani K, Lygerou Z, Kouvelas ED, Mitsacos A, Giompres P, Taraviras S. Geminin Participates in Differentiation Decisions of Adult Neural Stem Cells Transplanted in the Hemiparkinsonian Mouse Brain. Stem Cells Dev 2017; 26:1214-1222. [PMID: 28557659 DOI: 10.1089/scd.2016.0335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Neural stem cells have been considered as a source of stem cells that can be used for cell replacement therapies in neurodegenerative diseases, as they can be isolated and expanded in vitro and can be used for autologous grafting. However, due to low percentages of survival and varying patterns of differentiation, strategies that will enhance the efficacy of transplantation are under scrutiny. In this article, we have examined whether alterations in Geminin's expression, a protein that coordinates the balance between self-renewal and differentiation, can improve the properties of stem cells transplanted in 6-OHDA hemiparkinsonian mouse model. Our results indicate that, in the absence of Geminin, grafted cells differentiating into dopaminergic neurons were decreased, while an increased number of oligodendrocytes were detected. The number of proliferating multipotent cells was not modified by the absence of Geminin. These findings encourage research related to the impact of Geminin on transplantations for neurodegenerative disorders, as an important molecule in influencing differentiation decisions of the cells composing the graft.
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Affiliation(s)
- Ioanna Taouki
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Eve Tasiudi
- 2 Department of Physiology, School of Biology, University of Patras , Patras, Greece
| | - Maria-Eleni Lalioti
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Christina Kyrousi
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Eleni Skavatsou
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Konstantina Kaplani
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Zoi Lygerou
- 3 Department of General Biology, School of Medicine, University of Patras , Patras, Greece
| | - Elias D Kouvelas
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Adamantia Mitsacos
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
| | - Panagiotis Giompres
- 2 Department of Physiology, School of Biology, University of Patras , Patras, Greece
| | - Stavros Taraviras
- 1 Department of Physiology, School of Medicine, University of Patras , Patras, Greece
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Quintana AM, Hernandez JA, Gonzalez CG. Functional analysis of the zebrafish ortholog of HMGCS1 reveals independent functions for cholesterol and isoprenoids in craniofacial development. PLoS One 2017; 12:e0180856. [PMID: 28686747 PMCID: PMC5501617 DOI: 10.1371/journal.pone.0180856] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Accepted: 06/05/2017] [Indexed: 12/13/2022] Open
Abstract
There are 8 different human syndromes caused by mutations in the cholesterol synthesis pathway. A subset of these disorders such as Smith-Lemli-Opitz disorder, are associated with facial dysmorphia. However, the molecular and cellular mechanisms underlying such facial deficits are not fully understood, primarily because of the diverse functions associated with the cholesterol synthesis pathway. Recent evidence has demonstrated that mutation of the zebrafish ortholog of HMGCR results in orofacial clefts. Here we sought to expand upon these data, by deciphering the cholesterol dependent functions of the cholesterol synthesis pathway from the cholesterol independent functions. Moreover, we utilized loss of function analysis and pharmacological inhibition to determine the extent of sonic hedgehog (Shh) signaling in animals with aberrant cholesterol and/or isoprenoid synthesis. Our analysis confirmed that mutation of hmgcs1, which encodes the first enzyme in the cholesterol synthesis pathway, results in craniofacial abnormalities via defects in cranial neural crest cell differentiation. Furthermore targeted pharmacological inhibition of the cholesterol synthesis pathway revealed a novel function for isoprenoid synthesis during vertebrate craniofacial development. Mutation of hmgcs1 had no effect on Shh signaling at 2 and 3 days post fertilization (dpf), but did result in a decrease in the expression of gli1, a known Shh target gene, at 4 dpf, after morphological deficits in craniofacial development and chondrocyte differentiation were observed in hmgcs1 mutants. These data raise the possibility that deficiencies in cholesterol modulate chondrocyte differentiation by a combination of Shh independent and Shh dependent mechanisms. Moreover, our results describe a novel function for isoprenoids in facial development and collectively suggest that cholesterol regulates craniofacial development through versatile mechanisms.
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Affiliation(s)
- Anita M. Quintana
- Department of Biological Sciences, University of Texas El Paso, El Paso, TX, United States of America
- Border Biomedical Research Center, NeuroModulation Cluster, University of Texas El Paso, El Paso, TX, United States of America
- * E-mail:
| | - Jose A. Hernandez
- Department of Biological Sciences, University of Texas El Paso, El Paso, TX, United States of America
| | - Cesar G. Gonzalez
- Department of Biological Sciences, University of Texas El Paso, El Paso, TX, United States of America
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Patmanidi AL, Champeris Tsaniras S, Karamitros D, Kyrousi C, Lygerou Z, Taraviras S. Concise Review: Geminin-A Tale of Two Tails: DNA Replication and Transcriptional/Epigenetic Regulation in Stem Cells. Stem Cells 2016; 35:299-310. [DOI: 10.1002/stem.2529] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 09/18/2016] [Accepted: 10/01/2016] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - Dimitris Karamitros
- Department of Physiology; Medical School, University of Patras; Rio Patras Greece
| | - Christina Kyrousi
- Department of Physiology; Medical School, University of Patras; Rio Patras Greece
| | - Zoi Lygerou
- Department of Biology; Medical School, University of Patras; Rio Patras Greece
| | - Stavros Taraviras
- Department of Physiology; Medical School, University of Patras; Rio Patras Greece
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Konstantinidou C, Taraviras S, Pachnis V. Geminin prevents DNA damage in vagal neural crest cells to ensure normal enteric neurogenesis. BMC Biol 2016; 14:94. [PMID: 27776507 PMCID: PMC5075986 DOI: 10.1186/s12915-016-0314-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 09/23/2016] [Indexed: 12/29/2022] Open
Abstract
Background In vertebrate organisms, the neural crest (NC) gives rise to multipotential and highly migratory progenitors which are distributed throughout the embryo and generate, among other structures, the peripheral nervous system, including the intrinsic neuroglial networks of the gut, i.e. the enteric nervous system (ENS). The majority of enteric neurons and glia originate from vagal NC-derived progenitors which invade the foregut mesenchyme and migrate rostro-caudally to colonise the entire length of the gut. Although the migratory behaviour of NC cells has been studied extensively, it remains unclear how their properties and response to microenvironment change as they navigate through complex cellular terrains to reach their target embryonic sites. Results Using conditional gene inactivation in mice we demonstrate here that the cell cycle-dependent protein Geminin (Gem) is critical for the survival of ENS progenitors in a stage-dependent manner. Gem deletion in early ENS progenitors (prior to foregut invasion) resulted in cell-autonomous activation of DNA damage response and p53-dependent apoptosis, leading to severe intestinal aganglionosis. In contrast, ablation of Gem shortly after ENS progenitors had invaded the embryonic gut did not result in discernible survival or migratory deficits. In contrast to other developmental systems, we obtained no evidence for a role of Gem in commitment or differentiation of ENS lineages. The stage-dependent resistance of ENS progenitors to mutation-induced genotoxic stress was further supported by the enhanced survival of post gut invasion ENS lineages to γ-irradiation relative to their predecessors. Conclusions Our experiments demonstrate that, in mammals, NC-derived ENS lineages are sensitive to genotoxic stress in a stage-specific manner. Following gut invasion, ENS progenitors are distinctly resistant to Gem ablation and irradiation in comparison to their pre-enteric counterparts. These studies suggest that the microenvironment of the embryonic gut protects ENS progenitors and their progeny from genotoxic stress. Electronic supplementary material The online version of this article (doi:10.1186/s12915-016-0314-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Chrysoula Konstantinidou
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London, NW7 1AA, UK.,Present address: MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, Du Cane Road, London, W12 0NN, UK
| | - Stavros Taraviras
- Department of Physiology, Medical School, University of Patras, Patras, GR 26 500, Greece.
| | - Vassilis Pachnis
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London, NW7 1AA, UK.
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