1
|
Verruma CG, Santos RS, Marchesi JAP, Sales SLA, Vila RA, Rios ÁFL, Furtado CLM, Ramos ES. Dynamic methylation pattern of H19DMR and KvDMR1 in bovine oocytes and preimplantation embryos. J Assist Reprod Genet 2024; 41:333-345. [PMID: 38231285 PMCID: PMC10894807 DOI: 10.1007/s10815-023-03011-7] [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: 08/09/2023] [Accepted: 12/19/2023] [Indexed: 01/18/2024] Open
Abstract
PURPOSE This study aimed to evaluate the epigenetic reprogramming of ICR1 (KvDMR1) and ICR2 (H19DMR) and expression of genes controlled by them as well as those involved in methylation, demethylation, and pluripotency. METHODS We collected germinal vesicle (GV) and metaphase II (MII) oocytes, and preimplantation embryos at five stages [zygote, 4-8 cells, 8-16 cells, morula, and expanded blastocysts (ExB)]. DNA methylation was assessed by BiSeq, and the gene expression was evaluated using qPCR. RESULTS H19DMR showed an increased DNA methylation from GV to MII oocytes (68.04% and 98.05%, respectively), decreasing in zygotes (85.83%) until morula (61.65%), and ExB (63.63%). H19 and IGF2 showed increased expression in zygotes, which decreased in further stages. KvDMR1 was hypermethylated in both GV (71.82%) and MII (69.43%) and in zygotes (73.70%) up to morula (77.84%), with a loss of methylation at the ExB (36.64%). The zygote had higher expression of most genes, except for CDKN1C and PHLDA2, which were highly expressed in MII and GV oocytes, respectively. DNMTs showed increased expression in oocytes, followed by a reduction in the earliest stages of embryo development. TET1 was downregulated until 4-8-cell and upregulated in 8-16-cell embryos. TET2 and TET3 showed higher expression in oocytes, and a downregulation in MII oocytes and 4-8-cell embryo. CONCLUSION We highlighted the heterogeneity in the DNA methylation of H19DMR and KvDMR1 and a dynamic expression pattern of genes controlled by them. The expression of DNMTs and TETs genes was also dynamic owing to epigenetic reprogramming.
Collapse
Affiliation(s)
- Carolina G Verruma
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Renan S Santos
- Postgraduate Program in Physiology and Pharmacology, Drug Research and Development Center (NPDM), Federal University of Ceara (UFC), Fortaleza, CE, 60430-275, Brazil
| | - Jorge A P Marchesi
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Sarah L A Sales
- Postgraduate Program in Physiology and Pharmacology, Drug Research and Development Center (NPDM), Federal University of Ceara (UFC), Fortaleza, CE, 60430-275, Brazil
| | - Reginaldo A Vila
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Álvaro F L Rios
- Biotechnology Laboratory, Center of Bioscience and Biotechnology, State University of North Fluminense Darcy Ribeiro, Goitacazes Campus, Rio de Janeiro, Brazil
| | - Cristiana L M Furtado
- Experimental Biology Center, Graduate Program in Medical Sciences, University of Fortaleza - UNIFOR, Fortaleza, CE, 60811-905, Brazil
- Drug Research and Development Center (NPDM), Postgraduate Program in Translational Medicine, Federal University of Ceara (UFC), Fortaleza, CE, 60430-275, Brazil
| | - Ester S Ramos
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil.
| |
Collapse
|
2
|
Yadav D, Sharma PK, Mishra PS, Malviya R. The Potential of Stem Cells in Treating Breast Cancer. Curr Stem Cell Res Ther 2024; 19:324-333. [PMID: 37132308 DOI: 10.2174/1574888x18666230428094056] [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: 09/24/2022] [Revised: 11/26/2022] [Accepted: 12/29/2022] [Indexed: 05/04/2023]
Abstract
There has been a lot of interest in stem cell therapy as a means of curing disease in recent years. Despite extensive usage of stem cell therapy in the treatment of a wide range of medical diseases, it has been hypothesized that it plays a key part in the progression of cancer. Breast cancer is still the most frequent malignancy in women globally. However, the latest treatments, such as stem cell targeted therapy, are considered to be more effective in preventing recurrence, metastasis, and chemoresistance of breast cancer than older methods like chemotherapy and radiation. This review discusses the characteristics of stem cells and how stem cells may be used to treat breast cancer.
Collapse
Affiliation(s)
- Deepika Yadav
- Department of Pharmacy, School of Medical and Allied Sciences, Galgotias University, Greater Noida, Uttar Pradesh, India
| | - Pramod Kumar Sharma
- Department of Pharmacy, School of Medical and Allied Sciences, Galgotias University, Greater Noida, Uttar Pradesh, India
| | - Prem Shankar Mishra
- Department of Pharmacy, School of Medical and Allied Sciences, Galgotias University, Greater Noida, Uttar Pradesh, India
| | - Rishabha Malviya
- Department of Pharmacy, School of Medical and Allied Sciences, Galgotias University, Greater Noida, Uttar Pradesh, India
| |
Collapse
|
3
|
Punetha M, Kumar D, Saini S, Chaudhary S, Bajwa KK, Sharma S, Mangal M, Yadav PS, Green JA, Whitworth K, Datta TK. Optimising Electroporation Condition for CRISPR/Cas-Mediated Knockout in Zona-Intact Buffalo Zygotes. Animals (Basel) 2023; 14:134. [PMID: 38200865 PMCID: PMC10778295 DOI: 10.3390/ani14010134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 12/27/2023] [Accepted: 12/28/2023] [Indexed: 01/12/2024] Open
Abstract
Somatic cell nuclear transfer or cytoplasm microinjection has widely been used to produce genome-edited farm animals; however, these methods have several drawbacks which reduce their efficiency. In the present study, we describe an easy adaptable approach for the introduction of mutations using CRISPR-Cas9 electroporation of zygote (CRISPR-EP) in buffalo. The goal of the study was to determine the optimal conditions for an experimental method in which the CRISPR/Cas9 system is introduced into in vitro-produced buffalo zygotes by electroporation. Electroporation was performed using different combinations of voltage, pulse and time, and we observed that the electroporation in buffalo zygote at 20 V/mm, 5 pulses, 3 msec at 10 h post insemination (hpi) resulted in increased membrane permeability and higher knockout efficiency without altering embryonic developmental potential. Using the above parameters, we targeted buffalo POU5F1 gene as a proof of concept and found no variations in embryonic developmental competence at cleavage or blastocyst formation rate between control, POU5F1-KO, and electroporated control (EC) embryos. To elucidate the effect of POU5F1-KO on other pluripotent genes, we determined the relative expression of SOX2, NANOG, and GATA2 in the control (POU5F1 intact) and POU5F1-KO-confirmed blastocyst. POU5F1-KO significantly (p ≤ 0.05) altered the expression of SOX2, NANOG, and GATA2 in blastocyst stage embryos. In conclusion, we standardized an easy and straightforward protocol CRISPR-EP method that could be served as a useful method for studying the functional genomics of buffalo embryos.
Collapse
Affiliation(s)
- Meeti Punetha
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Dharmendra Kumar
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Sheetal Saini
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Suman Chaudhary
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Kamlesh Kumari Bajwa
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Surabhi Sharma
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Manu Mangal
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Prem S. Yadav
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| | - Jonathan A. Green
- Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Kristin Whitworth
- Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Tirtha K. Datta
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Buffaloes, Hisar 125001, Haryana, India
| |
Collapse
|
4
|
Maresca M, van den Brand T, Li H, Teunissen H, Davies J, de Wit E. Pioneer activity distinguishes activating from non-activating SOX2 binding sites. EMBO J 2023; 42:e113150. [PMID: 37691488 PMCID: PMC10577566 DOI: 10.15252/embj.2022113150] [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: 11/25/2022] [Revised: 07/17/2023] [Accepted: 07/22/2023] [Indexed: 09/12/2023] Open
Abstract
Genome-wide transcriptional activity involves the binding of many transcription factors (TFs) to thousands of sites in the genome. Pioneer TFs are a class of TFs that maintain open chromatin and allow non-pioneer TFs access to their target sites. Determining which TF binding sites directly drive transcription remains a challenge. Here, we use acute protein depletion of the pioneer TF SOX2 to establish its functionality in maintaining chromatin accessibility. We show that thousands of accessible sites are lost within an hour of protein depletion, indicating rapid turnover of these sites in the absence of the pioneer factor. To understand the relationship with transcription, we performed nascent transcription analysis and found that open chromatin sites that are maintained by SOX2 are highly predictive of gene expression, in contrast to all other SOX2 binding sites. We use CRISPR-Cas9 genome editing in the Klf2 locus to functionally validate a predicted regulatory element. We conclude that the regulatory activity of SOX2 is exerted mainly at sites where it maintains accessibility and that other binding sites are largely dispensable for gene regulation.
Collapse
Affiliation(s)
- Michela Maresca
- Division of Gene RegulationThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Teun van den Brand
- Division of Gene RegulationThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Hangpeng Li
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of MedicineUniversity of OxfordOxfordUK
| | - Hans Teunissen
- Division of Gene RegulationThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - James Davies
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of MedicineUniversity of OxfordOxfordUK
| | - Elzo de Wit
- Division of Gene RegulationThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| |
Collapse
|
5
|
Zhang J, Wei Z, Qi X, Jiang Y, Liu D, Liu K. Kinesin family member 11 promotes progression of hepatocellular carcinoma via the OCT4 pathway. Funct Integr Genomics 2023; 23:284. [PMID: 37648881 DOI: 10.1007/s10142-023-01209-7] [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: 05/21/2023] [Revised: 08/04/2023] [Accepted: 08/11/2023] [Indexed: 09/01/2023]
Abstract
Hepatocellular carcinoma (HCC) is the tumor with the second highest mortality rate worldwide. Recent research data show that KIF11, a member of the kinesin family (KIF), plays an important role in the progression of various tumors. However, its expression and molecular mechanism in HCC remain elusive. Here, we evaluated the potential role of KIF11 in HCC. The effect of KIF11 was evaluated using the hepatocellular carcinoma cell lines, LM3 and Huh7, after genetic or pharmacological treatment. Evaluating the role of KIF11 in the xenograft animal models using its specific inhibitor. The role of KIF11 was systematically evaluated using specimens obtained from the aforementioned animal and cell models after various in vivo and in vitro experiments. The clinicopathological analysis showed that KIF11 was expressed at high levels in patients with hepatocellular carcinoma. Cell experiments in vitro showed that KIF11 deficiency significantly slowed the proliferation of liver tumor cells. And in the experiment using liver cancer cells overexpressing OCT4, overexpression of OCT4 substantially increased the proliferation of tumor cells compared with tumor cells with KIF11 knockdown alone. Both in vitro cell experiment and in vivo xenotransplantation tumor experiment showed that monastrol, an inhibitor of KIF11, could effectively delay the proliferation and migration of tumor cells. Based on these results, KIF11 is expressed at high levels in hepatocellular carcinoma and promotes tumor proliferation in an OCT4-dependent manner. KIF11 may become a therapeutic target for hepatocellular carcinoma, and its inhibitor monastrol may become a clinical antitumor drug.
Collapse
Affiliation(s)
- Ju Zhang
- Department of General Surgery, The Second Xiangya Hospital of Central South University, No. 139 Renminzhong Road, Changsha, 410012, China
| | - Zuxing Wei
- Department of General Surgery, The Second Xiangya Hospital of Central South University, No. 139 Renminzhong Road, Changsha, 410012, China
| | - Xiaoyan Qi
- Department of General Surgery, The Second Xiangya Hospital of Central South University, No. 139 Renminzhong Road, Changsha, 410012, China
| | - Yuhong Jiang
- Department of General Surgery, The Second Xiangya Hospital of Central South University, No. 139 Renminzhong Road, Changsha, 410012, China
| | - Dekun Liu
- Department of General Surgery, The Second Xiangya Hospital of Central South University, No. 139 Renminzhong Road, Changsha, 410012, China
| | - Kuijie Liu
- Department of General Surgery, The Second Xiangya Hospital of Central South University, No. 139 Renminzhong Road, Changsha, 410012, China.
| |
Collapse
|
6
|
Ponomarev AS, Gilazieva ZE, Solovyova VV, Rizvanov AA. Molecular Mechanisms of Tumor Cell Stemness Modulation during Formation of Spheroids. BIOCHEMISTRY. BIOKHIMIIA 2023; 88:979-994. [PMID: 37751868 DOI: 10.1134/s0006297923070106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 05/30/2023] [Accepted: 06/07/2023] [Indexed: 09/28/2023]
Abstract
Cancer stem cells (CSCs), their properties and interaction with microenvironment are of interest in modern medicine and biology. There are many studies on the emergence of CSCs and their involvement in tumor pathogenesis. The most important property inherent to CSCs is their stemness. Stemness combines ability of the cell to maintain its pluripotency, give rise to differentiated cells, and interact with environment to maintain a balance between dormancy, proliferation, and regeneration. While adult stem cells exhibit these properties by participating in tissue homeostasis, CSCs behave as their malignant equivalents. High tumor resistance to therapy, ability to differentiate, activate angiogenesis and metastasis arise precisely due to the stemness of CSCs. These cells can be used as a target for therapy of different types of cancer. Laboratory models are needed to study cancer biology and find new therapeutic strategies. A promising direction is three-dimensional tumor models or spheroids. Such models exhibit properties resembling stemness in a natural tumor. By modifying spheroids, it becomes possible to investigate the effect of therapy on CSCs, thus contributing to the development of anti-tumor drug test systems. The review examines the niche of CSCs, the possibility of their study using three-dimensional spheroids, and existing markers for assessing stemness of CSCs.
Collapse
Affiliation(s)
- Aleksei S Ponomarev
- Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, 420008, Russia
| | - Zarema E Gilazieva
- Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, 420008, Russia
| | - Valeriya V Solovyova
- Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, 420008, Russia
| | - Albert A Rizvanov
- Kazan (Volga Region) Federal University, Kazan, Republic of Tatarstan, 420008, Russia.
| |
Collapse
|
7
|
Oses C, Francia MG, Verneri P, Vazquez Echegaray C, Guberman AS, Levi V. The dynamical organization of the core pluripotency transcription factors responds to differentiation cues in early S-phase. Front Cell Dev Biol 2023; 11:1125015. [PMID: 37215075 PMCID: PMC10192714 DOI: 10.3389/fcell.2023.1125015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 04/21/2023] [Indexed: 05/24/2023] Open
Abstract
DNA replication in stem cells is a major challenge for pluripotency preservation and cell fate decisions. This process involves massive changes in the chromatin architecture and the reorganization of many transcription-related molecules in different spatial and temporal scales. Pluripotency is controlled by the master transcription factors (TFs) OCT4, SOX2 and NANOG that partition into condensates in the nucleus of embryonic stem cells. These condensates are proposed to play relevant roles in the regulation of gene expression and the maintenance of pluripotency. Here, we asked whether the dynamical distribution of the pluripotency TFs changes during the cell cycle, particularly during DNA replication. Since the S phase is considered to be a window of opportunity for cell fate decisions, we explored if differentiation cues in G1 phase trigger changes in the distribution of these TFs during the subsequent S phase. Our results show a spatial redistribution of TFs condensates during DNA replication which was not directly related to chromatin compaction. Additionally, fluorescence fluctuation spectroscopy revealed TF-specific, subtle changes in the landscape of TF-chromatin interactions, consistent with their particularities as key players of the pluripotency network. Moreover, we found that differentiation stimuli in the preceding G1 phase triggered a relatively fast and massive reorganization of pluripotency TFs in early-S phase. Particularly, OCT4 and SOX2 condensates dissolved whereas the lifetimes of TF-chromatin interactions increased suggesting that the reorganization of condensates is accompanied with a change in the landscape of TF-chromatin interactions. Notably, NANOG showed impaired interactions with chromatin in stimulated early-S cells in line with its role as naïve pluripotency TF. Together, these findings provide new insights into the regulation of the core pluripotency TFs during DNA replication of embryonic stem cells and highlight their different roles at early differentiation stages.
Collapse
Affiliation(s)
- Camila Oses
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Marcos Gabriel Francia
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Paula Verneri
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Camila Vazquez Echegaray
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Alejandra Sonia Guberman
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
- Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Valeria Levi
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Facultad de Ciencias Exactas y Naturales, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
8
|
Sreekumar A, Saini S. Role of transcription factors and chromatin modifiers in driving lineage reprogramming in treatment-induced neuroendocrine prostate cancer. Front Cell Dev Biol 2023; 11:1075707. [PMID: 36711033 PMCID: PMC9879360 DOI: 10.3389/fcell.2023.1075707] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 01/02/2023] [Indexed: 01/14/2023] Open
Abstract
Therapy-induced neuroendocrine prostate cancer (NEPC) is a highly lethal variant of prostate cancer that is increasing in incidence with the increased use of next-generation of androgen receptor (AR) pathway inhibitors. It arises via a reversible trans-differentiation process, referred to as neuroendocrine differentiation (NED), wherein prostate cancer cells show decreased expression of AR and increased expression of neuroendocrine (NE) lineage markers including enolase 2 (ENO2), chromogranin A (CHGA) and synaptophysin (SYP). NEPC is associated with poor survival rates as these tumors are aggressive and often metastasize to soft tissues such as liver, lung and central nervous system despite low serum PSA levels relative to disease burden. It has been recognized that therapy-induced NED involves a series of genetic and epigenetic alterations that act in a highly concerted manner in orchestrating lineage switching. In the recent years, we have seen a spurt in research in this area that has implicated a host of transcription factors and epigenetic modifiers that play a role in driving this lineage switching. In this article, we review the role of important transcription factors and chromatin modifiers that are instrumental in lineage reprogramming of prostate adenocarcinomas to NEPC under the selective pressure of various AR-targeted therapies. With an increased understanding of the temporal and spatial interplay of transcription factors and chromatin modifiers and their associated gene expression programs in NEPC, better therapeutic strategies are being tested for targeting NEPC effectively.
Collapse
|
9
|
MacCarthy CM, Huertas J, Ortmeier C, Vom Bruch H, Tan DS, Reinke D, Sander A, Bergbrede T, Jauch R, Schöler HR, Cojocaru V. OCT4 interprets and enhances nucleosome flexibility. Nucleic Acids Res 2022; 50:10311-10327. [PMID: 36130732 PMCID: PMC9561370 DOI: 10.1093/nar/gkac755] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 07/28/2022] [Accepted: 08/24/2022] [Indexed: 01/06/2023] Open
Abstract
Pioneer transcription factors are proteins that induce cellular identity transitions by binding to inaccessible regions of DNA in nuclear chromatin. They contribute to chromatin opening and recruit other factors to regulatory DNA elements. The structural features and dynamics modulating their interaction with nucleosomes are still unresolved. From a combination of experiments and molecular simulations, we reveal here how the pioneer factor and master regulator of pluripotency, Oct4, interprets and enhances nucleosome structural flexibility. The magnitude of Oct4’s impact on nucleosome dynamics depends on the binding site position and the mobility of the unstructured tails of nucleosomal histone proteins. Oct4 uses both its DNA binding domains to propagate and stabilize open nucleosome conformations, one for specific sequence recognition and the other for nonspecific interactions with nearby regions of DNA. Our findings provide a structural basis for the versatility of transcription factors in engaging with nucleosomes and have implications for understanding how pioneer factors induce chromatin dynamics.
Collapse
Affiliation(s)
- Caitlin M MacCarthy
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany
| | - Jan Huertas
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Yusuf Hamied Department of Chemistry, University of Cambridge, UK
| | - Claudia Ortmeier
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany
| | - Hermann Vom Bruch
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany
| | - Daisylyn Senna Tan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China
| | - Deike Reinke
- Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Astrid Sander
- Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | | | - Ralf Jauch
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China
| | - Hans R Schöler
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Medical Faculty, University of Münster, Germany
| | - Vlad Cojocaru
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Computational Structural Biology Group, University of Utrecht, The Netherlands.,STAR-UBB Institute, Babeş-Bolyai University, Cluj-Napoca, Romania
| |
Collapse
|
10
|
Giannopoulou AI, Kanakoglou DS, Papavassiliou AG, Piperi C. Insights into the multi-faceted role of Pioneer transcription factors in glioma formation and progression with targeting options. Biochim Biophys Acta Rev Cancer 2022; 1877:188801. [PMID: 36113627 DOI: 10.1016/j.bbcan.2022.188801] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 08/30/2022] [Accepted: 09/07/2022] [Indexed: 11/16/2022]
Abstract
Pioneer transcription factors (TFs) present an important subtype of transcription factors which are vital for cell programming during embryonic development and cellular memory during mitotic growth, as well as cell fate reprogramming. Pioneer TFs can engage specific target binding sites on nucleosomal DNA to attract chromatin remodeling complexes, cofactors, and other transcription factors, ultimately controlling gene expression by shaping locally the epigenome. The priority of binding that they exhibit in contrast to other transcription factors and their involvement in crucial events regarding cell fate, has implicated their aberrant function in the pathogenesis of several disorders including carcinogenesis. Emerging experimental data indicate that certain Pioneer TFs are highly implicated in gliomas development, in neoplastic cell proliferation, angiogenic processes, resistance to therapy, and patient survival. Herein, we describe the main structural characteristics and functional mechanisms of pioneer TFs, focusing on their central role in the pathogenesis and progression of gliomas. We further highlight the current treatment options ranging from natural agents (oleanolic acid) to a variety of chemical compounds (APR-246, COTI-2) and discuss potential delivery systems, including nanoparticles, viral vectors, and intracellular protein delivery techniques.
Collapse
Affiliation(s)
- Angeliki-Ioanna Giannopoulou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece,.
| | - Dimitrios S Kanakoglou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece,.
| | - Athanasios G Papavassiliou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece,.
| | - Christina Piperi
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece,.
| |
Collapse
|
11
|
Species-Specific Enhancer Activity of OCT4 in Porcine Pluripotency: The Porcine OCT4 Reporter System Could Monitor Pluripotency in Porcine Embryo Development and Embryonic Stem Cells. Stem Cells Int 2022; 2022:6337532. [PMID: 35846983 PMCID: PMC9277468 DOI: 10.1155/2022/6337532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 05/06/2022] [Indexed: 01/31/2023] Open
Abstract
The present study examined the activity and function of the pig OCT4 enhancer in the porcine early embryonic development stage and porcine authentic embryonic stem cells. OCT4 is known as a pluripotent regulator, and its upstream regulatory region-based dual-fluorescence protein reporter system controlled by distal and proximal enhancers is broadly used in studies examining the states and mechanism of pluripotency. We analyzed how this reporter system functions during early embryo development and in stem cells using a previously established porcine-specific reporter system. We demonstrated that the porcine OCT4 distal enhancer and proximal enhancer were activated with different expression patterns simultaneously as the expression of pluripotent marker genes changed during the development of in vitro pathenotes and the establishment of porcine embryonic stem cells (ESCs). This work demonstrates the applicability of the porcine OCT4 upstream region-derived dual-fluorescence reporter system, which may be applied to investigations of species-specific pluripotency in porcine-origin cells. These reporter systems may be useful tools for studies of porcine-specific pluripotency, early embryo development, and embryonic stem cells.
Collapse
|
12
|
Williams MR, Xiaokang Y, Hathaway NA, Kireev D. A simulation model of heterochromatin formation at submolecular detail. iScience 2022; 25:104590. [PMID: 35800764 PMCID: PMC9254115 DOI: 10.1016/j.isci.2022.104590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 11/16/2021] [Accepted: 06/08/2022] [Indexed: 11/15/2022] Open
Abstract
Heterochromatin is a physical state of the chromatin fiber that maintains gene repression during cell development. Although evidence exists on molecular mechanisms involved in heterochromatin formation, a detailed structural mechanism of heterochromatin formation needs a better understanding. We made use of a simple Monte Carlo simulation model with explicit representation of key molecular events to observe molecular self-organization leading to heterochromatin formation. Our simulations provide a structural interpretation of several important traits of the heterochromatinization process. In particular, this study provides a depiction of how small amounts of HP1 are able to induce a highly condensed chromatin state through HP1 dimerization and bridging of sequence-remote nucleosomes. It also elucidates structural roots of a yet poorly understood phenomenon of a nondeterministic nature of heterochromatin formation and subsequent gene repression. Experimental chromatin in vivo assay provides an unbiased estimate of time scale of repressive response to a heterochromatin-triggering event.
Collapse
Affiliation(s)
- Michael R. Williams
- Center for Integrative Chemical Biology and Drug Discovery, University of North Carolina, Chapel Hill, NC 27513, USA
| | - Yan Xiaokang
- Center for Integrative Chemical Biology and Drug Discovery, University of North Carolina, Chapel Hill, NC 27513, USA
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, Chapel Hill, NC 27599, USA
| | - Nathaniel A. Hathaway
- Center for Integrative Chemical Biology and Drug Discovery, University of North Carolina, Chapel Hill, NC 27513, USA
- Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, Chapel Hill, NC 27599, USA
| | - Dmitri Kireev
- Center for Integrative Chemical Biology and Drug Discovery, University of North Carolina, Chapel Hill, NC 27513, USA
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA
| |
Collapse
|
13
|
Inhibiting ALK2/ALK3 Signaling to Differentiate and Chemo-Sensitize Medulloblastoma. Cancers (Basel) 2022; 14:cancers14092095. [PMID: 35565225 PMCID: PMC9102092 DOI: 10.3390/cancers14092095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/13/2022] [Accepted: 04/19/2022] [Indexed: 02/05/2023] Open
Abstract
Simple Summary Many cancers re-emerge after treatment, despite the sensitivity of the bulk of tumor cells to treatments. This observation has led to the ‘cancer stem cell’ (CSCs) hypothesis, stating that a subpopulation of cancer cells survive therapy and lead to tumor relapse. However, the lack of universal markers to target CSCs is the main constraint to fully eradicate the CSC pool. Differentiation therapy (DT) might in principle suppress tumorigenesis through conversion of undifferentiated cancer cells of high malignancy into differentiated cells of low tumorigenic potential. Here, we provide evidence that CSCs of medulloblastoma can be forced to resume their differentiation potential by inhibiting the BMP4–ALK2/3 axis, providing a new entry point for medulloblastoma treatment. Abstract Background: Medulloblastoma (MB) is a malignant pediatric brain tumor, and it represents the leading cause of death related to cancer in childhood. New perspectives for therapeutic development have emerged with the identification of cancer stem cells (CSCs) displaying tumor initiating capability and chemoresistance. However, the mechanisms responsible for CSCs maintenance are poorly understood. The lack of a universal marker signature represents the main constraints to identify and isolate CSCs within the tumor. Methods: To identify signaling pathways promoting CSC maintenance in MB, we combined tumorsphere assays with targeted neurogenesis PCR pathway arrays. Results: We showed a consistent induction of signaling pathways regulating pluripotency of CSCs in all the screened MB cells. BMP4 signaling was consistently enriched in all tumorsphere(s) independently of their specific stem-cell marker profile. The octamer-binding transcription factor 4 (OCT4), an important regulator of embryonic pluripotency, enhanced CSC maintenance in MBs by inducing the BMP4 signaling pathway. Consistently, inhibition of BMP4 signaling with LDN-193189 reduced stem-cell traits and promoted cell differentiation. Conclusions: Our work suggests that interfering with the BMP4 signaling pathway impaired the maintenance of the CSC pool by promoting cell differentiation. Hence, differentiation therapy might represent an innovative therapeutic to improve the current standard of care in MB patients.
Collapse
|
14
|
Zaveri L, Dhawan J. Inducible expression of Oct-3/4 reveals synergy with Klf4 in targeting Cyclin A2 to enhance proliferation during early reprogramming. Biochem Biophys Res Commun 2022; 587:29-35. [PMID: 34864392 DOI: 10.1016/j.bbrc.2021.11.058] [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: 09/27/2021] [Revised: 11/02/2021] [Accepted: 11/15/2021] [Indexed: 11/18/2022]
Abstract
During reprogramming of somatic cells, heightened proliferation is one of the earliest changes observed. While other early events such as mesenchymal-to-epithelial transition have been well studied, the mechanisms by which the cell cycle switches from a slow cycling state to a faster cycling state are still incompletely understood. To investigate the role of Oct-3/4 in this early transition, we created a 4-Hydroxytamoxifen (OHT) dependent Oct-3/4 Estrogen Receptor fusion (OctER). We confirmed that OctER can substitute for Oct-3/4 to reprogram mouse embryonic fibroblasts to a pluripotent state. During the early stages of reprograming, Oct-3/4 and Klf4 individually did not affect cell proliferation but in combination hastened the cell cycle. Using OctER + Klf4, we found that proliferative enhancement is OHT dose-dependent, suggesting that OctER is the driver of this transition. We identified Cyclin A2 as a likely target of Oct-3/4 + Klf4. In mESC, Klf4 and Oct-3/4 bind ∼100bp upstream of Cyclin A2 CCRE, suggesting a potential regulatory role. Using inducible OctER, we show a dose-dependent induction of Cyclin A2 promoter-reporter activity. Taken together, our results suggest that Cyclin A2 is a key early target during reprogramming, and support the view that a rapid cell cycle assists the transition to pluripotency.
Collapse
Affiliation(s)
- Lamuk Zaveri
- Institute for Stem Cell Science and Regenerative Medicine, Bengaluru, 560068, India; CSIR-Centre for Cellular and Molecular Biology, Hyderabad, 500007, India; Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Jyotsna Dhawan
- Institute for Stem Cell Science and Regenerative Medicine, Bengaluru, 560068, India; CSIR-Centre for Cellular and Molecular Biology, Hyderabad, 500007, India.
| |
Collapse
|
15
|
Mehri M, Gheitasi R, Pourbagher R, Ranaee M, Nayeri K, Rahimi SM, Khorasani HR, Hossein-Nattaj H, Sabour D, Akhavan-Niaki H, Fattahi S, Kalali B, Mostafazadeh A. Ninety-six-hour starved peripheral blood mononuclear cell supernatant inhibited LA7 breast cancer stem cells induced tumor via reduction in angiogenesis and alternations in Gch1 and Spr expressions. Front Immunol 2022; 13:1025933. [PMID: 36908807 PMCID: PMC9996193 DOI: 10.3389/fimmu.2022.1025933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 12/22/2022] [Indexed: 02/25/2023] Open
Abstract
Introduction The microenvironment of solid tumors such as breast cancer is heterogeneous and complex, containing different types of cell, namely, cancer stem cells and immune cells. We previously reported the immunoregulatory behavior of the human immune cell in a solid tumor microenvironment-like culture under serum starvation stress for 96 h. Here, we examined the effect of this culture-derived solution on breast cancer development in rats. Method Ninety-six-hour starved PBMCs supernatant (96 h-SPS) was collected after culturing human PBMCs for 96 h under serum starvation condition. Breast cancer stem cells, LA7 cell line, was used for in vitro study by analyzing gene expression status and performing cytotoxicity, proliferation, scratch wound healing assays, followed by in vivo tumor induction in three groups of mature female Sprague Dawley rats. Animals were treated with 96 h-SPS or RPMI and normal saline as control, n = 6 for each group. After biochemical analysis of iron, lactate, and pH levels in the dissected tumors, Ki67 antigen expression, angiogenesis, and necrosis evaluation were carried out. Metabolic-related gene expression was assessed using RT-qPCR. Moreover, 96 h-SPS composition was discovered by Nano-LC-ESI-MS/MS. Results 96 h-SPS solution reduced the LA7 cell viability, proliferation, and migration and Gch1 and Spr genes expression in vitro (p< 0.05), whereas stemness gene Oct4 was upregulated (p< 0.01). The intracellular lactate was significantly decreased in the 96 h-SPS treated group (p = 0.007). In this group, Gch1 and Spr were significantly downregulated (p< 0.05), whereas the Sox2 and Oct4 expression was not changed significantly. The number of vessels and mitosis (Ki67+ cells) in the 96 h-SPS-treated group was significantly reduced (p = 0.024). The increased rate of necrosis in this group was statistically significant (p = 0.04). Last, proteomics analysis revealed candidate effectors' components of 96 h-SPS solution. Conclusion 96 h-SPS solution may help to prevent cancer stem cell mediated tumor development. This phenomenon could be mediated through direct cytotoxic effects, inhibition of cell proliferation and migration in association with reduction in Gch1 and Spr genes expression, angiogenesis and mitosis rate, and necrosis augmentation. The preliminary data obtained from the present study need to be investigated on a larger scale and can be used as a pilot for further studies on the biology of cancer development.
Collapse
Affiliation(s)
- Maryam Mehri
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Reza Gheitasi
- Institute of Infectious Diseases and Infection Control, Jena University Hospital/Friedrich Schiller University, Jena, Germany
| | - Roghayeh Pourbagher
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran.,Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Mohammad Ranaee
- Department of Pathology, School of Medicine, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Kosar Nayeri
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Seyed Mostafa Rahimi
- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Hamid Reza Khorasani
- Department of Cancer Medicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Babol, Iran.,Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran, Iran
| | - Hadi Hossein-Nattaj
- Immunology Department, Mazandaran University of Medical Sciences, Sari, Iran
| | - Davood Sabour
- Department of Cancer Medicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Babol, Iran.,Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran, Iran.,Department of Genetics, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Haleh Akhavan-Niaki
- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Sadegh Fattahi
- North Research Center, Pasteur Institute of Iran, Amol, Iran
| | - Behnam Kalali
- Department of Medicine II, Klinikum Grosshadern, Ludwig Maximilian University (LMU) University, Munich, Germany
| | - Amrollah Mostafazadeh
- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| |
Collapse
|
16
|
Porcine OCT4 reporter system as a tool for monitoring pluripotency states. JOURNAL OF ANIMAL REPRODUCTION AND BIOTECHNOLOGY 2021. [DOI: 10.12750/jarb.36.4.175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
|
17
|
Pou5f1 and Nanog Are Reliable Germ Cell-Specific Genes in Gonad of a Protogynous Hermaphroditic Fish, Orange-Spotted Grouper (Epinephelus coioides). Genes (Basel) 2021; 13:genes13010079. [PMID: 35052423 PMCID: PMC8774525 DOI: 10.3390/genes13010079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/12/2021] [Accepted: 12/25/2021] [Indexed: 01/06/2023] Open
Abstract
Pluripotency markers Pou5f1 and Nanog are core transcription factors regulating early embryonic development and maintaining the pluripotency and self-renewal of stem cells. Pou5f1 and Nanog also play important roles in germ cell development and gametogenesis. In this study, Pou5f1 (EcPou5f1) and Nanog (EcNanog) were cloned from orange-spotted grouper, Epinephelus coioides. The full-length cDNAs of EcPou5f1 and EcNanog were 2790 and 1820 bp, and encoded 475 and 432 amino acids, respectively. EcPou5f1 exhibited a specific expression in gonads, whereas EcNanog was expressed highly in gonads and weakly in some somatic tissues. In situ hybridization analyses showed that the mRNA signals of EcNanog and EcPou5f1 were exclusively restricted to germ cells in gonads. Likewise, immunohistofluorescence staining revealed that EcNanog protein was limited to germ cells. Moreover, both EcPou5f1 and EcNanog mRNAs were discovered to be co-localized with Vasa mRNA, a well-known germ cell maker, in male and female germ cells. These results implied that EcPou5f1 and EcNanog could be also regarded as reliable germ cell marker genes. Therefore, the findings of this study would pave the way for elucidating the mechanism whereby EcPou5f1 and EcNanog regulate germ cell development and gametogenesis in grouper fish, and even in other protogynous hermaphroditic species.
Collapse
|
18
|
Nayak C, Singh SK. In silico identification of natural product inhibitors against Octamer-binding transcription factor 4 (Oct4) to impede the mechanism of glioma stem cells. PLoS One 2021; 16:e0255803. [PMID: 34613998 PMCID: PMC8494328 DOI: 10.1371/journal.pone.0255803] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 07/23/2021] [Indexed: 02/07/2023] Open
Abstract
Octamer-binding transcription factor 4 (Oct4) is a core regulator in the retention of stemness, invasive, and self-renewal properties in glioma initiating cells (GSCs) and its overexpression inhibits the differentiation of glioma cells promoting tumor cell proliferation. The Pit-Oct-Unc (POU) domain comprising POU-specific domain (POUS) and POU-type homeodomain (POUHD) subdomains is the most critical part of the Oct4 for the generation of induced pluripotent stem cells from somatic cells that lead to tumor initiation, invasion, posttreatment relapse, and therapeutic resistance. Therefore, the present investigation hunts for natural product inhibitors (NPIs) against the POUHD domain of Oct4 by employing receptor-based virtual screening (RBVS) followed by binding free energy calculation and molecular dynamics simulation (MDS). RBVS provided 13 compounds with acceptable ranges of pharmacokinetic properties and good docking scores having key interactions with the POUHD domain. More Specifically, conformational and interaction stability analysis of 13 compounds through MDS unveiled two compounds ZINC02145000 and ZINC32124203 which stabilized the backbone of protein even in the presence of linker and POUS domain. Additionally, ZINC02145000 and ZINC32124203 exhibited stable and strong interactions with key residues W277, R242, and R234 of the POUHD domain even in dynamic conditions. Interestingly, ZINC02145000 and ZINC32124203 established communication not only with the POUHD domain but also with the POUS domain indicating their incredible potency toward thwarting the function of Oct4. ZINC02145000 and ZINC32124203 also reduced the flexibility and escalated the correlations between the amino acid residues of Oct4 evidenced by PCA and DCCM analysis. Finally, our examination proposed two NPIs that can impede the Oct4 function and may help to improve overall survival, diminish tumor relapse, and achieve a cure not only in deadly disease GBM but also in other cancers with minimal side effects.
Collapse
Affiliation(s)
- Chirasmita Nayak
- Computer-Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Alagappa University, Karaikudi Tamil Nadu, India
| | - Sanjeev Kumar Singh
- Computer-Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Alagappa University, Karaikudi Tamil Nadu, India
| |
Collapse
|
19
|
Oliveira FR, Casalechi M, Carneiro MM, de Ávila I, Dela Cruz C, Del Puerto HL, Camargos AF, Abrão MS, Reis FM. Immunolocalization of stem/progenitor cell biomarkers Oct-4, C-kit and Musashi-1 in endometriotic lesions. Mol Biol Rep 2021; 48:6863-6870. [PMID: 34468911 DOI: 10.1007/s11033-021-06685-3] [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: 07/12/2021] [Accepted: 08/23/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND Human endometrium harbors stem/progenitor cells (SPCs) that may contribute to the establishment of endometriosis when seeded outside the uterus. Oct-4, C-kit and Musashi-1 are some of the many proteins used to characterize SPCs, but their association with endometriosis is uncertain. OBJECTIVE AND DESIGN In this study, specimens of normal endometrium (n = 12), eutopic endometrium from women with endometriosis (n = 9), superficial peritoneal endometriosis (SUP, n = 12) and deep endometriosis (DE, n = 13) lesions were evaluated for localization and intensity of immunostaining for Oct-4, C-kit and Musashi-1. RESULTS The three markers were abundantly expressed in normal endometrium, eutopic endometrium from endometriosis patients, SUP and DE specimens. Oct-4 and C-kit expression did not vary across groups as regards intensity or frequency. C-kit staining signal was seldom detected in vascular endothelium of normal or eutopic endometrium from endometriosis patients; however, it was positive in 67% of the SUP lesions and in 25% of the DE lesions (p = 0.042). Musashi-1 was expressed in some endometriotic glands as cell clusters, but its signal was similar between the four types of tissue (p = 0.971) CONCLUSION: The wide distribution of Oct-4, C-kit and Musashi-1 in endometria of patients with and without endometriosis and in SUP and DE endometriotic lesions suggests that these markers are not suitable for the in situ characterization of endometrial SPCs and should not be taken as surrogates for the study of SPCs in the pathogenesis of endometriosis.
Collapse
Affiliation(s)
- Flavia R Oliveira
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maíra Casalechi
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Márcia M Carneiro
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Ivete de Ávila
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Cynthia Dela Cruz
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Helen L Del Puerto
- Department of Pathology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Aroldo F Camargos
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maurício S Abrão
- Gynecologic Division, BP - A Beneficência Portuguesa de São Paulo, São Paulo, Brazil
- Obstetrics and Gynecology Department, Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil
| | - Fernando M Reis
- Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
- Division of Human Reproduction, Department of Obstetrics and Gynecology, Hospital das Clínicas, UFMG, Av. Alfredo Balena, 110, 9˚ andar, Belo Horizonte, MG, 30130-100, Brazil.
| |
Collapse
|
20
|
Kim SH, Choi KH, Lee M, Lee DK, Lee CK. Porcine OCT4 Reporter System Can Monitor Species-Specific Pluripotency During Somatic Cell Reprogramming. Cell Reprogram 2021; 23:168-179. [PMID: 34037424 DOI: 10.1089/cell.2021.0001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
This study examined the activity and function of pig OCT4 enhancer in porcine reprogramming cells. Dual fluorescent protein reporter systems controlled by the upstream regulatory region of OCT4, which is one of the master regulators for pluripotency, are widely used in studies of the mechanism of pluripotency. We analyzed how this reporter system functions in fibroblast growth factor (FGF)- or leukemia inhibitory factor (LIF)-dependent reprogrammed porcine pluripotent stem cells using the previously established porcine-specific reporter system. Porcine embryonic fibroblasts were coinfected with the pOCT4-ΔPE-eGFP (distal enhancer [DE]-green fluorescent protein [GFP]) and pOCT4-ΔDE-DsRed2 (proximal enhancer [PE]-red fluorescent protein [RFP]) vectors, and GFP and RFP expression were verified during a DOX-dependent reprogramming process. We demonstrated that the porcine OCT4 DE and PE were activated in different expression patterns simultaneously as changes in the expression of pluripotent marker genes during the establishment of porcine-induced pluripotent stem cells (iPSCs). Porcine OCT4 upstream region-derived dual fluorescent protein reporter systems confirmed that porcine iPSCs are in primed state after reprogramming in FGF2- or LIF-containing media. This work demonstrates the applicability of porcine OCT4 upstream region-derived dual fluorescence reporter system, which may be applied to investigations of species-specific pluripotency in porcine-origin cells. These reporter systems may be useful tools for studies of porcine-specific pluripotency, early embryo development, and embryonic stem cells.
Collapse
Affiliation(s)
- Seung-Hun Kim
- Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute of Agriculture and Life Science, Seoul National University, Seoul, Korea
| | - Kwang-Hwan Choi
- Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute of Agriculture and Life Science, Seoul National University, Seoul, Korea
| | - Mingyun Lee
- Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute of Agriculture and Life Science, Seoul National University, Seoul, Korea
| | - Dong-Kyung Lee
- Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute of Agriculture and Life Science, Seoul National University, Seoul, Korea
| | - Chang-Kyu Lee
- Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute of Agriculture and Life Science, Seoul National University, Seoul, Korea.,Designed Animal & Transplantation Research Institute, Institute of Green Bio Science and Technology, Seoul National University, Gangwon-do, Korea
| |
Collapse
|
21
|
Dan S, Song Y, Duan X, Pan X, Chen C, She S, Su T, Li J, Chen X, Zhou Y, Chen W, Zhang X, Pan X, Wang YJ, Kang B. LSD1-mediated demethylation of OCT4 safeguards pluripotent stem cells by maintaining the transcription of PORE-motif-containing genes. Sci Rep 2021; 11:10285. [PMID: 33986438 PMCID: PMC8119428 DOI: 10.1038/s41598-021-89734-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 04/30/2021] [Indexed: 11/09/2022] Open
Abstract
Reversible lysine methylation is essential for regulating histones and emerges to critically regulate non-histone proteins as well. Here we show that the master transcription factor OCT4 in pluripotent stem cells (PSCs) was methylated at multiple lysine residues. LSD1 that is highly expressed in PSCs can directly interact with and demethylate OCT4 at lysine 222 (K222) in the flexible linker region. Reduced LSD1 activity led to the methylation of OCT4-K222 that diminished the differentiation potential of PSCs while facilitating proteasome-independent degradation of OCT4 proteins. Furthermore, site-specifically replacing K222 with phenylalanine to mimic the constitutively methylated lysine promoted the 'locked-in' mode engagement of the OCT4 PORE-homodimers that tightly bind to and block the transcription of multiple PORE-motif-containing target genes regulating cell fate determination and cell junction organization, and thereby reducing the pluripotency of PSCs. Thus, LSD1-mediated demethylation of OCT4 plays a crucial role in restricting the 'locked-in' mode binding of OCT4 PORE-homodimers to the PORE-motif-containing genes and thereby maintaining their transcription to safeguard the pluripotency of PSCs.
Collapse
Affiliation(s)
- Songsong Dan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Yuelin Song
- College of Life Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang, China
| | - Xiaotao Duan
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, 100850, China
| | - Xiao Pan
- College of Life Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang, China
| | - Cheng Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Shiqi She
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Tong Su
- College of Life Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang, China
| | - Jingchao Li
- College of Life Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang, China
| | - Xinyu Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Yanwen Zhou
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Wenjie Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Xiaobing Zhang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Xiaoyun Pan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Ying-Jie Wang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China.
| | - Bo Kang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China.
| |
Collapse
|
22
|
Structures of chromatin modulators in complex with nucleosome. Curr Opin Chem Biol 2021; 63:105-114. [PMID: 33823458 DOI: 10.1016/j.cbpa.2021.02.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 02/11/2021] [Accepted: 02/25/2021] [Indexed: 12/17/2022]
Abstract
The chromatin structure is dynamically regulated by many different modulators that post-translationally modify histones, replace canonical histones with histone variants, and unwind nucleosomal DNA, thereby modulating the accessibility of nucleosomal DNA and facilitating downstream DNA-templated nuclear processes. To understand how these modulators change the chromatin structure, it is essential to determine the 3D structures of chromatin modulators in complex with nucleosome. Here, we review the very recent progress in structural studies of some selected chromatin modulators in complex with nucleosome, including those of histone demethylases LSD1/2, some pioneer transcription factors, and the PWWP domain-containing protein LEDGF.
Collapse
|
23
|
Teo AKK, Nguyen L, Gupta MK, Lau HH, Loo LSW, Jackson N, Lim CS, Mallard W, Gritsenko MA, Rinn JL, Smith RD, Qian WJ, Kulkarni RN. Defective insulin receptor signaling in hPSCs skews pluripotency and negatively perturbs neural differentiation. J Biol Chem 2021; 296:100495. [PMID: 33667549 PMCID: PMC8050001 DOI: 10.1016/j.jbc.2021.100495] [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] [Received: 05/02/2020] [Revised: 02/18/2021] [Accepted: 03/01/2021] [Indexed: 11/26/2022] Open
Abstract
Human embryonic stem cells are a type of pluripotent stem cells (hPSCs) that are used to investigate their differentiation into diverse mature cell types for molecular studies. The mechanisms underlying insulin receptor (IR)-mediated signaling in the maintenance of human pluripotent stem cell (hPSC) identity and cell fate specification are not fully understood. Here, we used two independent shRNAs to stably knock down IRs in two hPSC lines that represent pluripotent stem cells and explored the consequences on expression of key proteins in pathways linked to proliferation and differentiation. We consistently observed lowered pAKT in contrast to increased pERK1/2 and a concordant elevation in pluripotency gene expression. ERK2 chromatin immunoprecipitation, luciferase assays, and ERK1/2 inhibitors established direct causality between ERK1/2 and OCT4 expression. Of importance, RNA sequencing analyses indicated a dysregulation of genes involved in cell differentiation and organismal development. Mass spectrometry–based proteomic analyses further confirmed a global downregulation of extracellular matrix proteins. Subsequent differentiation toward the neural lineage reflected alterations in SOX1+PAX6+ neuroectoderm and FOXG1+ cortical neuron marker expression and protein localization. Collectively, our data underscore the role of IR-mediated signaling in maintaining pluripotency, the extracellular matrix necessary for the stem cell niche, and regulating cell fate specification including the neural lineage.
Collapse
Affiliation(s)
- Adrian Kee Keong Teo
- Section of Islet Cell and Regenerative Biology, Department of Medicine, Joslin Diabetes Center, Brigham and Women's Hospital, Harvard Medical School, and Harvard Stem Cell Institute, Boston, Massachusetts, USA; Stem Cells and Diabetes Laboratory, Institute of Molecular and Cell Biology, Proteos, Singapore, Singapore; Department of Biochemistry and Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
| | - Linh Nguyen
- Stem Cells and Diabetes Laboratory, Institute of Molecular and Cell Biology, Proteos, Singapore, Singapore; Department of Biochemistry and Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Manoj K Gupta
- Section of Islet Cell and Regenerative Biology, Department of Medicine, Joslin Diabetes Center, Brigham and Women's Hospital, Harvard Medical School, and Harvard Stem Cell Institute, Boston, Massachusetts, USA
| | - Hwee Hui Lau
- Stem Cells and Diabetes Laboratory, Institute of Molecular and Cell Biology, Proteos, Singapore, Singapore; School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Larry Sai Weng Loo
- Stem Cells and Diabetes Laboratory, Institute of Molecular and Cell Biology, Proteos, Singapore, Singapore; School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Nicholas Jackson
- Section of Islet Cell and Regenerative Biology, Department of Medicine, Joslin Diabetes Center, Brigham and Women's Hospital, Harvard Medical School, and Harvard Stem Cell Institute, Boston, Massachusetts, USA
| | - Chang Siang Lim
- Stem Cells and Diabetes Laboratory, Institute of Molecular and Cell Biology, Proteos, Singapore, Singapore
| | - William Mallard
- Department of Stem Cell and Regenerative Biology, Harvard University, and Broad Institute of MIT, Cambridge, Massachusetts, USA
| | - Marina A Gritsenko
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA
| | - John L Rinn
- Department of Stem Cell and Regenerative Biology, Harvard University, and Broad Institute of MIT, Cambridge, Massachusetts, USA
| | - Richard D Smith
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA
| | - Wei-Jun Qian
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA
| | - Rohit N Kulkarni
- Section of Islet Cell and Regenerative Biology, Department of Medicine, Joslin Diabetes Center, Brigham and Women's Hospital, Harvard Medical School, and Harvard Stem Cell Institute, Boston, Massachusetts, USA.
| |
Collapse
|
24
|
MYD88 signals induce tumour-initiating cell generation through the NF-κB-HIF-1α activation cascade. Sci Rep 2021; 11:3991. [PMID: 33597599 PMCID: PMC7890054 DOI: 10.1038/s41598-021-83603-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 02/04/2021] [Indexed: 02/06/2023] Open
Abstract
Tumour-promoting inflammation is a hallmark of cancer, and chronic inflammatory disease increases the risk of cancer. In this context, MYD88, a downstream signalling molecule of Toll-like receptors that initiates inflammatory signalling cascades, has a critical role in tumour development in mice and its gene mutation was found in human cancers. In inflammation-induced colon cancer, tumour suppressor p53 mutations have also been detected with high frequency as early events. However, the molecular mechanism of MYD88-induced cancer development is poorly understood. Here, we demonstrated that MYD88 induced the protein accumulation of the transcription factor HIF-1α through NF-κB in p53-deficient cells. HIF-1α accumulation was not caused by enhanced protein stability but by NF-κB-mediated transcriptional activation, the enhanced translation of HIF-1α and JNK activation. In contrast, MYD88-induced mRNA expressions of HIF-1α and HIF-1-target genes were attenuated in the presence of p53. Furthermore, constitutively active forms of MYD88 induced tumour-initiating cell (TIC) generation in p53-deficient cells, as determined by tumour xenografts in nude mice. TIC generating activity was diminished by the suppression of NF-κB or HIF-1α. These results indicate that MYD88 signals induce the generation of TICs through the NF-κB-HIF-1α activation cascade in p53-deficient cells and suggest this molecular mechanism underlies inflammation-induced cancer development.
Collapse
|
25
|
Zhang Q, Han Z, Zhu Y, Chen J, Li W. The Role and Specific Mechanism of OCT4 in Cancer Stem Cells: A Review. Int J Stem Cells 2020; 13:312-325. [PMID: 32840233 PMCID: PMC7691851 DOI: 10.15283/ijsc20097] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 07/20/2020] [Accepted: 07/21/2020] [Indexed: 02/06/2023] Open
Abstract
Recently, evidences show that cancer stem cells (CSCs) are a type of cancer cell group with self-renewal and play a huge role in tumor recurrence, metastasis, and drug resistance. Finding new treatment directions and targets for cancer prognosis and reducing mortality has become a top priority. OCT4, as a transcription factor, participates in maintaining the stem characteristics of CSCs, but the mechanism of OCT4 is often overlooked. In this review, we try to illustrate the mechanism by which OCT4 plays a role in CSCs from the perspective of genetic modification of OCT4, non-coding RNA, complexes and signaling pathways associated with OCT4. Our ultimate goal is to provide new targets for cancer treatment to prolong the survival of cancer patients.
Collapse
Affiliation(s)
- Qi Zhang
- Stem Cell and Cancer Center, The First Hospital of Jilin University, Changchun, China
| | - Zhenzhen Han
- Stem Cell and Cancer Center, The First Hospital of Jilin University, Changchun, China
| | - Yanbo Zhu
- Stem Cell and Cancer Center, The First Hospital of Jilin University, Changchun, China
| | - Jingcheng Chen
- Stem Cell and Cancer Center, The First Hospital of Jilin University, Changchun, China
| | - Wei Li
- Stem Cell and Cancer Center, The First Hospital of Jilin University, Changchun, China
| |
Collapse
|
26
|
In Silico Estimation of the Abundance and Phylogenetic Significance of the Composite Oct4-Sox2 Binding Motifs within a Wide Range of Species. DATA 2020. [DOI: 10.3390/data5040111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
High-throughput sequencing technologies have greatly accelerated the progress of genomics, transcriptomics, and metagenomics. Currently, a large amount of genomic data from various organisms is being generated, the volume of which is increasing every year. Therefore, the development of methods that allow the rapid search and analysis of DNA sequences is urgent. Here, we present a novel motif-based high-throughput sequence scoring method that generates genome information. We found and identified Utf1-like, Fgf4-like, and Hoxb1-like motifs, which are cis-regulatory elements for the pluripotency transcription factors Sox2 and Oct4 within the genomes of different eukaryotic organisms. The genome-wide analysis of these motifs was performed to understand the impact of their diversification on mammalian genome evolution. Utf1-like, Fgf4-like, and Hoxb1-like motif diversity was evaluated across genomes from multiple species.
Collapse
|
27
|
Zuo Y, Song M, Li H, Chen X, Cao P, Zheng L, Cao G. Analysis of the Epigenetic Signature of Cell Reprogramming by Computational DNA Methylation Profiles. Curr Bioinform 2020. [DOI: 10.2174/1574893614666190919103752] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
DNA methylation plays an important role in the reprogramming process.
Understanding the underlying molecular mechanism of reprogramming is crucial for answering
fundamental questions regarding the transition of cell identity.
Methods:
In this study, based on the genome-wide DNA methylation data from different cell lines,
comparative methylation profiles were proposed to identify the epigenetic signature of cell
reprogramming.
Results:
The density profile of CpG methylation showed that pluripotent cells are more polarized
than Human Dermal Fibroblasts (HDF) cells. The heterogeneity of iPS has a greater deviation in
the DNA hypermethylation pattern. The result of regional distribution showed that the differential
CpG sites between pluripotent cells and HDFs tend to accumulate in the gene body and CpG shelf
regions, whereas the internal differential methylation CpG sites (DMCs) of three types of
pluripotent cells tend to accumulate in the TSS1500 region. Furthermore, a series of endogenous
markers of cell reprogramming were identified based on the integrative analysis, including focal
adhesion, pluripotency maintenance and transcription regulation. The calcium signaling pathway
was detected as one of the signatures between NT cells and iPS cells. Finally, the regional bias of
DNA methylation for key pluripotency factors was discussed. Our studies provide new insight into
the barrier identification of cell reprogramming.
Conclusion:
Our studies analyzed some epigenetic markers and barriers of nuclear reprogramming,
hoping to provide new insight into understanding the underlying molecular mechanism
of reprogramming.
Collapse
Affiliation(s)
- Yongchun Zuo
- The College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Mingmin Song
- State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences, Inner Mongolia University, Hohhot, 010070, China
| | - Hanshuang Li
- State key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences, Inner Mongolia University, Hohhot, 010070, China
| | - Xing Chen
- State key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences, Inner Mongolia University, Hohhot, 010070, China
| | - Pengbo Cao
- State key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences, Inner Mongolia University, Hohhot, 010070, China
| | - Lei Zheng
- State key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences, Inner Mongolia University, Hohhot, 010070, China
| | - Guifang Cao
- The College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, China
| |
Collapse
|
28
|
Abstract
While recent experiments revealed that some pioneer transcription factors (TFs) can bind to their target DNA sequences inside a nucleosome, the binding dynamics of their target recognitions are poorly understood. Here we used the latest coarse-grained models and molecular dynamics simulations to study the nucleosome-binding procedure of the two pioneer TFs, Sox2 and Oct4. In the simulations for a strongly positioning nucleosome, Sox2 selected its target DNA sequence only when the target was exposed. Otherwise, Sox2 entropically bound to the dyad region nonspecifically. In contrast, Oct4 plastically bound on the nucleosome mainly in two ways. First, the two POU domains of Oct4 separately bound to the two parallel gyres of the nucleosomal DNA, supporting the previous experimental results of the partial motif recognition. Second, the POUS domain of Oct4 favored binding on the acidic patch of histones. Then, simulating the TFs binding to a genomic nucleosome, the LIN28B nucleosome, we found that the recognition of a pseudo motif by Sox2 induced the local DNA bending and shifted the population of the rotational position of the nucleosomal DNA. The redistributed DNA phase, in turn, changed the accessibility of a distant TF binding site, which consequently affected the binding probability of a second Sox2 or Oct4. These results revealed a nucleosomal DNA-mediated allosteric mechanism, through which one TF binding event can change the global conformation, and effectively regulate the binding of another TF at distant sites. Our simulations provide insights into the binding mechanism of single and multiple TFs on the nucleosome.
Collapse
|
29
|
Regulation of stem cell function and neuronal differentiation by HERV-K via mTOR pathway. Proc Natl Acad Sci U S A 2020; 117:17842-17853. [PMID: 32669437 DOI: 10.1073/pnas.2002427117] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Stem cells are capable of unlimited proliferation but can be induced to form brain cells. Factors that specifically regulate human development are poorly understood. We found that human stem cells expressed high levels of the envelope protein of an endogenized human-specific retrovirus (HERV-K, HML-2) from loci in chromosomes 12 and 19. The envelope protein was expressed on the cell membrane of the stem cells and was critical in maintaining the stemness via interactions with CD98HC, leading to triggering of human-specific signaling pathways involving mammalian target of rapamycin (mTOR) and lysophosphatidylcholine acyltransferase (LPCAT1)-mediated epigenetic changes. Down-regulation or epigenetic silencing of HML-2 env resulted in dissociation of the stem cell colonies and enhanced differentiation along neuronal pathways. Thus HML-2 regulation is critical for human embryonic and neurodevelopment, while it's dysregulation may play a role in tumorigenesis and neurodegeneration.
Collapse
|
30
|
Patra SK. Roles of OCT4 in pathways of embryonic development and cancer progression. Mech Ageing Dev 2020; 189:111286. [PMID: 32531293 DOI: 10.1016/j.mad.2020.111286] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 04/08/2020] [Accepted: 06/06/2020] [Indexed: 12/11/2022]
Abstract
Somatic cells may be reprogrammed to pluripotent state by ectopic expression of certain transcription factors; namely, OCT4, SOX2, KLF4 and c-MYC. However, the molecular and cellular mechanisms are not adequately understood, especially for human embryonic development. Studies during the last five years implicated importance of OCT4 in human zygotic genome activation (ZGA), patterns of OCT4 protein folding and role of specialized sequences in binding to DNA for modulation of gene expression during development. Epigenetic modulation of OCT4 gene and post translational modifications of OCT4 protein activity in the context of multiple cancers are important issues. A consensus is emerging that chromatin organization and epigenetic landscape play crucial roles for the interactions of transcription factors, including OCT4 with the promoters and/or regulatory sequences of genes associated with human embryonic development (ZGA through lineage specification) and that when the epigenome niche is deregulated OCT4 helps in cancer progression, and how OCT4 silencing in somatic cells of adult organisms may impact ageing.
Collapse
Affiliation(s)
- Samir Kumar Patra
- Epigenetics and Cancer Research Laboratory, Biochemistry and Molecular Biology Group, Department of Life Science, National Institute of Technology, Rourkela, Odisha, 769008, India.
| |
Collapse
|
31
|
Meagre Argyrosomus regius (Asso, 1801) Stem Spermatogonia: Histological Characterization, Immunostaining, In Vitro Proliferation, and Cryopreservation. Animals (Basel) 2020; 10:ani10050851. [PMID: 32423131 PMCID: PMC7278407 DOI: 10.3390/ani10050851] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 01/01/2023] Open
Abstract
The meagre, Argyrosomus regius, is a valued fish species of which aquaculture production might be supported by the development of a stem germ cell xenotransplantation technology. Meagre males were sampled at a fish farm in the Ionian Sea (Italy) at the beginning and end of the reproductive season. Small and large Type A undifferentiated spermatogonia were histologically identified in the germinal epithelium. Among the tested stemness markers, anti-oct4 and anti-vasa antibodies labeled cells likely corresponding to the small single Type A spermatogonia; no labeling was obtained with anti-GFRA1 and anti-Nanos2 antibodies. Two types of single A spermatogonia were purified via density gradient centrifugation of enzymatically digested testes. Testes from fish in active spermatogenesis resulted in a more efficient spermatogonial stem cell (SSC) yield. After cell seeding, meagre SSCs showed active proliferation from Day 7 to Day 21 and were cultured up to Day 41. After cryopreservation in dimethyl-sulfoxide-based medium, cell viability was 28.5%. In conclusion, these results indicated that meagre SSCs could be isolated, characterized, cultured in vitro, successfully cryopreserved, and used after thawing. This is a first step towards the development of a xenotransplantation technology that might facilitate the reproduction of this valuable species in captivity.
Collapse
|
32
|
Ethyl-p-methoxycinnamate enhances oct4 expression and reinforces pluripotency through the NF-κB signaling pathway. Biochem Pharmacol 2020; 177:113984. [PMID: 32311348 DOI: 10.1016/j.bcp.2020.113984] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 04/15/2020] [Indexed: 12/13/2022]
Abstract
Pluripotent stem cells are have therapeutic applications in regenerative medicine and drug discovery. However, the differentiation of stem cells in vitro hinders their large-scale production and clinical applications. The maintenance of cell pluripotency relies on a complex network of transcription factors; of these, octamer-binding transcription factor-4 (Oct4) plays a key role. This study aimed to construct an Oct4 gene promoter-driven firefly luciferase reporter and screen small-molecule compounds could maintain cell self-renewal and pluripotency. The results showed that ethyl-p-methoxycinnamate (EPMC) enhance the promoter activity of the Oct4 gene, increased the expression of Oct4 at both mRNA and protein levels, and significantly promoted the colony formation of P19 cells. These findings suggesting that EPMC could reinforce the self-renewal capacity of P19 cells. The pluripotency markers Oct4, SRY-related high-mobility-group-box protein-2, and Nanog were expressed at higher levels in EPMC-induced colonies. EPMC could promote teratoma formation and differentiation potential of P19 cells in vivo. It also enhanced self-renewal and pluripotency of human umbilical cord mesenchymal stem cells and mouse embryonic stem cells. Moreover, it significantly activated the nuclear factor kappa B (NF-κB) signaling pathway via the myeloid differentiation factor 88-dependent pathway. The expression level of Oct4 decreased after blocking the NF-κB signaling pathway, suggesting that EPMC promoted the expression of Oct4 partially through the NF-κB signaling pathway. This study indicated that EPMC could maintain self-renewal and pluripotency of stem cells.
Collapse
|
33
|
Zhou N, Zhang XB, Chen C, Chen XY, Kang B, He JQ, Gong GZ, Wang YJ, Zhou YW. Cellular context- and protein level-dependent interaction of pluripotency factor OCT4A with multiple octamer motifs of the same target gene. Life Sci 2020; 248:117461. [PMID: 32097665 DOI: 10.1016/j.lfs.2020.117461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 02/20/2020] [Accepted: 02/20/2020] [Indexed: 10/24/2022]
Abstract
AIMS To compare how OCT4A proteins interact with and regulate multiple OCT4A-octamer motifs (OMs) in different regions of the FOS gene expressed in somatic cancer cells versus pluripotent stem cells. MATERIALS AND METHODS Two FOS reporter gene systems harboring predicted OMs or their mutational counterparts were introduced into HeLa and NCCIT cells with varying OCT4A protein levels. The transcription of dsGFP reflecting FOS expression was quantitated by RT-qPCR, the OCT4A-OMs binding and the correlation between OCT4A and FOS transcription was determined by ChIP-PCR and RNA-Seq, respectively. KEY FINDINGS In NCCIT cells, abundant OCT4A proteins bound to and inhibited OM1 and OM2 at the promoter of the FOS gene. RA-induced OCT4A down-regulation transiently increased FOS transcription. In contrast, in HeLa cells that contain much lower levels of endogenous OCT4A proteins, OCT4A primarily bound to and activate OM1 thereby promoting FOS transcription. OCT4A KO significantly reduced FOS expression. Ectopically introduced OCT4A, at its leaked or induced expression level, promoted FOS transcription by binding to OM2/OM3 or OM1/OM3, respectively. Thus, the interaction of OCT4A proteins with different OMs is cellular context- and protein level-dependent, and such complicated OCT4A binding mode can only be reflected by a dsGFP-based reporter harboring the full-length FOS gene but not by that merely having the FOS promoter. SIGNIFICANCE Our findings unravel an additional layer of regulatory mechanisms that account for the cellular context- and dose-related versatile functions of OCT4A protein, and further underscore the importance of precise modulation of OCT4A in the regenerative medicine and anticancer therapies.
Collapse
Affiliation(s)
- Ning Zhou
- Department of Infectious Diseases, the Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China; State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Xiao-Bing Zhang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Cheng Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Xin-Yu Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Bo Kang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Jian-Qin He
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Guo-Zhong Gong
- Department of Infectious Diseases, the Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Ying-Jie Wang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China
| | - Yan-Wen Zhou
- Department of Infectious Diseases, the Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China; State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China.
| |
Collapse
|
34
|
Yang L, Shi P, Zhao G, Xu J, Peng W, Zhang J, Zhang G, Wang X, Dong Z, Chen F, Cui H. Targeting cancer stem cell pathways for cancer therapy. Signal Transduct Target Ther 2020; 5:8. [PMID: 32296030 PMCID: PMC7005297 DOI: 10.1038/s41392-020-0110-5] [Citation(s) in RCA: 883] [Impact Index Per Article: 220.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 12/15/2019] [Accepted: 12/19/2019] [Indexed: 12/18/2022] Open
Abstract
Since cancer stem cells (CSCs) were first identified in leukemia in 1994, they have been considered promising therapeutic targets for cancer therapy. These cells have self-renewal capacity and differentiation potential and contribute to multiple tumor malignancies, such as recurrence, metastasis, heterogeneity, multidrug resistance, and radiation resistance. The biological activities of CSCs are regulated by several pluripotent transcription factors, such as OCT4, Sox2, Nanog, KLF4, and MYC. In addition, many intracellular signaling pathways, such as Wnt, NF-κB (nuclear factor-κB), Notch, Hedgehog, JAK-STAT (Janus kinase/signal transducers and activators of transcription), PI3K/AKT/mTOR (phosphoinositide 3-kinase/AKT/mammalian target of rapamycin), TGF (transforming growth factor)/SMAD, and PPAR (peroxisome proliferator-activated receptor), as well as extracellular factors, such as vascular niches, hypoxia, tumor-associated macrophages, cancer-associated fibroblasts, cancer-associated mesenchymal stem cells, extracellular matrix, and exosomes, have been shown to be very important regulators of CSCs. Molecules, vaccines, antibodies, and CAR-T (chimeric antigen receptor T cell) cells have been developed to specifically target CSCs, and some of these factors are already undergoing clinical trials. This review summarizes the characterization and identification of CSCs, depicts major factors and pathways that regulate CSC development, and discusses potential targeted therapy for CSCs.
Collapse
Affiliation(s)
- Liqun Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Pengfei Shi
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Gaichao Zhao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Jie Xu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Wen Peng
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Jiayi Zhang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Guanghui Zhang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Xiaowen Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Zhen Dong
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China
| | - Fei Chen
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 400716, Chongqing, China.
- Cancer Center, Medical Research Institute, Southwest University, 400716, Chongqing, China.
| |
Collapse
|
35
|
Huertas J, MacCarthy CM, Schöler HR, Cojocaru V. Nucleosomal DNA Dynamics Mediate Oct4 Pioneer Factor Binding. Biophys J 2020; 118:2280-2296. [PMID: 32027821 PMCID: PMC7202942 DOI: 10.1016/j.bpj.2019.12.038] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/04/2019] [Accepted: 12/23/2019] [Indexed: 01/16/2023] Open
Abstract
Transcription factor (TF) proteins bind to DNA to regulate gene expression. Normally, accessibility to DNA is required for their function. However, in the nucleus, the DNA is often inaccessible, wrapped around histone proteins in nucleosomes forming the chromatin. Pioneer TFs are thought to induce chromatin opening by recognizing their DNA binding sites on nucleosomes. For example, Oct4, a master regulator and inducer of stem cell pluripotency, binds to DNA in nucleosomes in a sequence-specific manner. Here, we reveal the structural dynamics of nucleosomes that mediate Oct4 binding from molecular dynamics simulations. Nucleosome flexibility and the amplitude of nucleosome motions such as breathing and twisting are enhanced in nucleosomes with multiple TF binding sites. Moreover, the regions around the binding sites display higher local structural flexibility. Probing different structures of Oct4-nucleosome complexes, we show that alternative configurations in which Oct4 recognizes partial binding sites display stable TF-DNA interactions similar to those observed in complexes with free DNA and compatible with the DNA curvature and DNA-histone interactions. Therefore, we propose a structural basis for nucleosome recognition by a pioneer TF that is essential for understanding how chromatin is unraveled during cell fate conversions.
Collapse
Affiliation(s)
- Jan Huertas
- In Silico Biomolecular Structure and Dynamics Group, Hubrecht Institute, Utrecht, the Netherlands; Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany; Center for Multiscale Theory and Computation, Westfälische Wilhelms University, Münster, Germany; and
| | - Caitlin M MacCarthy
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany
| | - Hans R Schöler
- Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany; Medical Faculty, University of Münster, Münster, Germany
| | - Vlad Cojocaru
- In Silico Biomolecular Structure and Dynamics Group, Hubrecht Institute, Utrecht, the Netherlands; Department of Cellular and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany; Center for Multiscale Theory and Computation, Westfälische Wilhelms University, Münster, Germany; and.
| |
Collapse
|
36
|
Rao RS, Raju K L, Augustine D, Patil S. Prognostic Significance of ALDH1, Bmi1, and OCT4 Expression in Oral Epithelial Dysplasia and Oral Squamous Cell Carcinoma. Cancer Control 2020; 27:1073274820904959. [PMID: 32951453 PMCID: PMC7791458 DOI: 10.1177/1073274820904959] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/18/2019] [Accepted: 01/13/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Increasing evidence suggests the involvement of cancer stem cells (CSCs) in both oral epithelial dysplasia (OED) and oral squamous cell carcinoma (OSCC). Among the various CSC markers, aldehyde dehydrogenase (ALDH) 1, B cell-specific Moloney murine leukaemia virus integration site 1 (Bmi1), and octamer-binding protein 4 (OCT4) have been noted to increase in OSCC. The aim of the study was to analyze ALDH1, Bmi1, and OCT4 expression in OED and OSCC with clinicopathologic correlation and survival analysis. METHODS A total of 40 cases each of OED and OSCC were retrieved from departmental archives. Expression of ALDH1, Bmi1, and OCT4 was analyzed using immunohistochemistry and was correlated with clinicopathological parameters. A follow-up ranging from 6 to 52 months was considered for Kaplan-Meier survival analysis. The log-rank test was performed to analyze significant difference in survival rates. RESULTS The expression levels of ALDH1, Bmi1, and OCT4 increased significantly from OED through OSCC (P < .05). The expression of ALDH1 and OCT4 showed a significant correlation with lymph node metastasis. Positive cases of ALDH1 showed a significantly reduced survival rate compared to cases showing negative expression. Kaplan-Meier survival analysis showed a significant reduction of survival rate (P = .00) in patients showing a positive expression for all the 3 markers. CONCLUSION ALDH1 and OCT4 could be used as individual prognostic markers for assessing prognosis. ALDH1, Bmi1, and OCT4 could be used as a collective panel of markers to enable surgeons in predicting the prognosis of patients and thereby carry out prompt follow-up for such cases.
Collapse
Affiliation(s)
- Roopa S. Rao
- Department of Oral Pathology and Microbiology, Faculty of Dental
Sciences, M.S. Ramaiah University of Applied
Sciences, India
| | - Lizbeth Raju K
- Department of Oral Pathology and Microbiology, Faculty of Dental
Sciences, M.S. Ramaiah University of Applied
Sciences, India
| | - Dominic Augustine
- Department of Oral Pathology and Microbiology, Faculty of Dental
Sciences, M.S. Ramaiah University of Applied
Sciences, India
| | - Shankargouda Patil
- Department of Maxillofacial Surgery and Diagnostic Sciences, College
of Dentistry, Jazan University, Saudi Arabia
| |
Collapse
|
37
|
Multiple novel hepatocellular carcinoma signature genes are commonly controlled by the master pluripotency factor OCT4. Cell Oncol (Dordr) 2019; 43:279-295. [PMID: 31848930 DOI: 10.1007/s13402-019-00487-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Worldwide, hepatocellular carcinoma (HCC) is a common solid tumor with a poor prognosis. HCC is often due to hepatitis B virus (HBV) infection. As yet, efficacious HCC treatment regimens for late-stage HCC patients are lacking. Therefore, the identification of more specific and sensitive biomarkers for its early diagnosis and treatment remains an urgent need. METHODS Total RNAs from paired HBV-derived HCC tumors and adjacent peritumor tissues (APTs) were subjected to RNA sequencing (RNA-seq), and differentially expressed genes (DEGs) between HCC tumors and APTs were selected and verified. RESULTS We identified 166 DEGs and found that eight top-ranked and verified DEGs (TK1, CTTN, CEP72, TRIP13, FTH1, FLAD1, CHRM2, AMBP) all contained putative OCT4 binding motifs in their promoter regions. TK1, TRIP13 and OCT4 were found to exhibit concurrent higher expression levels in HCC tumors than in APTs. The mRNA levels of TK1, TRIP13 and OCT4 in a cohort of 384 HCC samples from the TCGA database were all found to be negatively correlated with patient overall survival, relapse-free survival and progression-free survival, underscoring the HCC biomarker status of TK1 and TRIP13 on one hand, and implicating their association with OCT4 on the other hand. Furthermore, OCT4 proteins were found to bind to the promoters of both genes in vitro and in vivo. Knocking out OCT4 in HCC-derived cell lines reduced the expression of TK1 and TRIP13 and significantly decreased their tumorigenicity. CONCLUSIONS Using RNA-seq, we identified several novel HCC signature genes that may serve as biomarkers for its diagnosis and prognosis. Their common transcriptional regulation by OCT4 suggests key roles in the development of HCC, and indicates that OCT4 may serve as a potential therapeutic target.
Collapse
|
38
|
The spatial binding model of the pioneer factor Oct4 with its target genes during cell reprogramming. Comput Struct Biotechnol J 2019; 17:1226-1233. [PMID: 31921389 PMCID: PMC6944736 DOI: 10.1016/j.csbj.2019.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 09/05/2019] [Accepted: 09/07/2019] [Indexed: 12/18/2022] Open
Abstract
Understanding the target regulation between pioneer factor and its binding genes is crucial for improving the efficiency of TF-mediated reprogramming. Oct4 as the only one factor that cannot be substituted by other POU members, it is urgent need to develop a quantitative model for describing the spatial binding pattern with its target genes. The dynamic profiles of pioneer factor Oct4-binding showed that the major wave occurs at the intermediate stage of cell reprogramming (from day 7 to day 15), and the promoter is the preferred targeting regions. The Oct4-binding distributions perform significant chromosome bias. The overall enrichment on chromosome 1–11 is higher than that on the others. The dramatic event of TF-mediated reprogramming is mainly concentrated on autosomes. We also found that the spatial binding ability of Oct4 binding can be represented quantitatively by using three parameters of peaks (height, width and distance). The dynamic changes of Oct4-binding demonstrated that the width play more important roles in regulating expression of target genes. At last, a multivariate linear regression was introduced to establish the spatial binding model of the Oct4-binding. The evaluation results confirmed that the height and width is positively correlated with the gene expression. And the additive interaction terms of height and width can better optimize the model performance than the multiplicative terms. The best average coefficients of determination of improved model achieved to 81.38%. Our study will provide new insights into the cooperative regulation of spatial binding pattern of pioneer factors in cell reprogramming.
Collapse
|
39
|
Schmidhauser M, Renz PF, Tsikrika P, Freimann R, Wutz A, Wrana JL, Beyer TA. Gaining Insights into the Function of Post-Translational Protein Modification Using Genome Engineering and Molecular Cell Biology. J Mol Biol 2019; 431:3920-3932. [PMID: 31306665 DOI: 10.1016/j.jmb.2019.07.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 07/03/2019] [Accepted: 07/05/2019] [Indexed: 11/18/2022]
Abstract
Modifications by kinases are a fast and reversible mechanism to diversify the function of the targeted proteins. The OCT4 transcription factor is essential for preimplantation development and pluripotency of embryonic stem cells (ESC), and its activity is tightly regulated by post-transcriptional modifications. Several phosphorylation sites have been identified by systemic approaches and their functions proposed. Here, we combined molecular and cellular biology with CRISPR/Cas9-mediated genome engineering to pinpoint the function of serine 12 of OCT4 in ESCs. Using chemical inhibitors and an antibody specific to OCT4 phosphorylated on S12, we identified cyclin-dependent kinase (CDK) 7 as upstream kinase. Surprisingly, generation of isogenic mESCs that endogenously ablate S12 revealed no effects on pluripotency and self-renewal, potentially due to compensation by other phosphorylation events. Our approach reveals that modification of distinct amino acids by precise genome engineering can help to clarify the functions of post-translational modifications on proteins encoded by essential gene in an endogenous context.
Collapse
Affiliation(s)
| | - Peter F Renz
- Institute for Molecular Health Sciences, ETH Zurich, Switzerland; Life Science Zurich Graduate School, Molecular Life Science program, University of Zürich, Switzerland
| | - Panagiota Tsikrika
- Institute for Molecular Health Sciences, ETH Zurich, Switzerland; Life Science Zurich Graduate School, Molecular Life Science program, University of Zürich, Switzerland
| | - Remo Freimann
- Institute for Molecular Health Sciences, ETH Zurich, Switzerland
| | - Anton Wutz
- Institute for Molecular Health Sciences, ETH Zurich, Switzerland
| | - Jeffrey L Wrana
- Lunenfeld-Tanenbaum Research Institute, Toronto, Ontario, Canada
| | - Tobias A Beyer
- Institute for Molecular Health Sciences, ETH Zurich, Switzerland.
| |
Collapse
|
40
|
Bhagirath D, Yang TL, Tabatabai ZL, Majid S, Dahiya R, Tanaka Y, Saini S. BRN4 Is a Novel Driver of Neuroendocrine Differentiation in Castration-Resistant Prostate Cancer and Is Selectively Released in Extracellular Vesicles with BRN2. Clin Cancer Res 2019; 25:6532-6545. [PMID: 31371344 DOI: 10.1158/1078-0432.ccr-19-0498] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 06/21/2019] [Accepted: 07/26/2019] [Indexed: 01/08/2023]
Abstract
PURPOSE Neuroendocrine prostate cancer (NEPC), an aggressive variant of castration-resistant prostate cancer (CRPC), often emerges after androgen receptor-targeted therapies such as enzalutamide or de novo, via trans-differentiation process of neuroendocrine differentiation. The mechanistic basis of neuroendocrine differentiation is poorly understood, contributing to lack of effective predictive biomarkers and late disease recognition. The purpose of this study was to examine the role of novel proneural Pit-Oct-Unc-domain transcription factors (TF) in NEPC and examine their potential as noninvasive predictive biomarkers.Experimental Design: Prostate cancer patient-derived xenograft models, clinical samples, and cellular neuroendocrine differentiation models were employed to determine the expression of TFs BRN1 and BRN4. BRN4 levels were modulated in prostate cancer cell lines followed by functional assays. Furthermore, extracellular vesicles (EV) were isolated from patient samples and cell culture models, characterized by nanoparticle tracking analyses, Western blotting, and real-time PCR. RESULTS We identify for the first time that: (i) BRN4 is amplified and overexpressed in NEPC clinical samples and that BRN4 overexpression drives neuroendocrine differentiation via its interplay with BRN2, a TF that was previously implicated in NEPC; (ii) BRN4 and BRN2 mRNA are actively released in prostate cancer EVs upon neuroendocrine differentiation induction; and (iii) enzalutamide treatment augments release of BRN4 and BRN2 in prostate cancer EVs, promoting neuroendocrine differentiation induction. CONCLUSIONS Our study identifies a novel TF that drives NEPC and suggests that as adaptive mechanism to enzalutamide treatment, prostate cancer cells express and secrete BRN4 and BRN2 in EVs that drive oncogenic reprogramming of prostate cancer cells to NEPC. Importantly, EV-associated BRN4 and BRN2 are potential novel noninvasive biomarkers to predict neuroendocrine differentiation in CRPC.
Collapse
Affiliation(s)
- Divya Bhagirath
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California
| | - Thao Ly Yang
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California
| | - Z Laura Tabatabai
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California
| | - Shahana Majid
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California
| | - Rajvir Dahiya
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California
| | - Yuichiro Tanaka
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California
| | - Sharanjot Saini
- Department of Urology, Veterans Affairs Medical Center San Francisco and University of California San Francisco, San Francisco, California.
| |
Collapse
|
41
|
Fan W, Yang X, Huang F, Tong X, Zhu L, Wang S. Identification of CD206 as a potential biomarker of cancer stem-like cells and therapeutic agent in liver cancer. Oncol Lett 2019; 18:3218-3226. [PMID: 31452799 PMCID: PMC6704291 DOI: 10.3892/ol.2019.10673] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 06/13/2019] [Indexed: 12/11/2022] Open
Abstract
The mannose receptor (CD206) functions in endocytosis and phagocytosis, and plays an important role in immune homeostasis. Tumor-associated macrophages express high level of CD206 and are thought to contribute to cancer progression through tumor immunosuppression, metastasis and angiogenesis. However, the significance of CD206 in the pathology of liver cancer has not been investigated. The present study evaluated the clinical significance of CD206 in the progression and prognosis of liver cancer in pathological tissues from 327 patients. Increased CD206 expression was observed in liver cancer samples compared with healthy adjacent liver tissue (42.8 vs. 62.4%; P<0.05). CD206 expression was significantly associated with tumor size (P=0.009) and metastasis (P=0.041). The recurrence free survival rate of patients with CD206-positive liver cancer was significantly decreased compared with patients with CD206-negative liver cancer (P=0.003). A Cox regression model revealed that liver cancer survival was independently associated with tumor size, metastasis and α-fetoprotein value. The results further revealed that CD206 expression in cancer stem cell (CSC)-like cells was comparable to other internationally recognized biomarkers. Additionally, when CD206 expression was silenced in the liver cancer cell lines HepG2 and PLC/PRF/5 using a short hairpin RNA approach, migration and invasion of the cells significantly decreased compared with controls (P<0.01). CD206 expression in liver cancer significantly influences distant metastasis and spread, resulting in poor patient prognosis. Furthermore, CD206 may be a potential biomarker in CSC-like cells to predict the occurrence of liver cancer.
Collapse
Affiliation(s)
- Weimin Fan
- The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310000, P.R. China.,Clinical Research Institute, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
| | - Xue Yang
- Clinical Research Institute, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
| | - Fang Huang
- Department of Pathology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
| | - Xiangmin Tong
- Clinical Research Institute, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
| | - Lifen Zhu
- Clinical Research Institute, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
| | - Shibing Wang
- Clinical Research Institute, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
| |
Collapse
|
42
|
Kim J, Kim HS, Shim JJ, Lee J, Kim AY, Kim J. Critical role of the fibroblast growth factor signalling pathway in Ewing's sarcoma octamer-binding transcription factor 4-mediated cell proliferation and tumorigenesis. FEBS J 2019; 286:4443-4472. [PMID: 31155838 DOI: 10.1111/febs.14946] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 02/18/2019] [Accepted: 05/31/2019] [Indexed: 12/27/2022]
Abstract
Certain bone and soft tissue (BST) tumours harbour a chromosomal translocation [t(6;22)(p21;q12)], which fuses the Ewing's sarcoma (EWS) gene at 22q12 with the octamer-binding transcription factor 4 (Oct-4) gene at 6p21, resulting in the chimeric EWS-Oct-4 protein that possesses high transactivation ability. Although abnormal activation of signalling pathways can lead to human cancer development, the pathways underlying these processes in human BST tumours remain poorly explored. Here, we investigated the functional significance of fibroblast growth factor (FGF) signalling in human BST tumours. To identify the gene(s) involved in the FGF signalling pathway and potentially regulated by EWS-Oct-4 (also called EWS-POU5F1), we performed RNA-Seq analysis, electrophoretic mobility shift assays, chromatin immunoprecipitation assays, and xenograft assays. Treating GBS6 or ZHBTc4 cells-expressing EWS-Oct-4 with the small molecule FGF receptor (FGFR) inhibitors PD173074, NVPBGJ398, ponatinib, and dovitinib suppressed cellular proliferation. Gene expression analysis revealed that, among 22 Fgf and four Fgfr family members, Fgf-4 showed the highest upregulation (by 145-fold) in ZHBTc4 cells-expressing EWS-Oct-4. Computer-assisted analysis identified a putative EWS-Oct-4-binding site at +3017/+3024, suggesting that EWS-Oct-4 regulates Fgf-4 expression in human BST tumours. Fgf-4 enhancer constructs showed that EWS-Oct-4 transactivated the Fgf-4 gene reporter in vitro, and that overexpression of EWS-Oct-4 stimulated endogenous Fgf-4 gene expression in vivo. Finally, PD173074 significantly decreased tumour volume in mice. Taken together, these data suggest that FGF-4 signalling is involved in EWS-Oct-4-mediated tumorigenesis, and that its inhibition impairs tumour growth in vivo significantly.
Collapse
Affiliation(s)
- Junghoon Kim
- Laboratory of Molecular and Cellular Biology, Department of Life Science, Sogang University, Seoul, Korea
| | - Hyo Sun Kim
- Laboratory of Molecular and Cellular Biology, Department of Life Science, Sogang University, Seoul, Korea
| | - Jung-Jae Shim
- Laboratory of Molecular and Cellular Biology, Department of Life Science, Sogang University, Seoul, Korea
| | - Jungwoon Lee
- Laboratory of Molecular and Cellular Biology, Department of Life Science, Sogang University, Seoul, Korea
| | - Ah-Young Kim
- Laboratory of Molecular and Cellular Biology, Department of Life Science, Sogang University, Seoul, Korea
| | - Jungho Kim
- Laboratory of Molecular and Cellular Biology, Department of Life Science, Sogang University, Seoul, Korea
| |
Collapse
|
43
|
Talkhabi M. Partial reprogramming as a therapeutic approach for heart disease: A state-of-the-art review. J Cell Biochem 2019; 120:14247-14261. [PMID: 31081174 DOI: 10.1002/jcb.28900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 03/10/2019] [Accepted: 03/22/2019] [Indexed: 11/08/2022]
Abstract
Heart disease such as myocardial infarction is the first cause of mortality in all countries. Today, cardiac cell-based therapy using de novo produced cardiac cells is considered as a novel approach for cardiac regenerative medicine. Recently, an alchemy-like approach, known as direct reprogramming or direct conversion, has been developed to directly convert somatic cells to cardiac cells in vitro and in vivo. This cellular alchemy is a short-cut and safe strategy for generating autologous cardiac cells, and it can be accomplished through activating cardiogenesis- or pluripotency-related factors in noncardiac cells. Importantly, pluripotency factors-based direct cardiac conversion, known as partial reprogramming, is shorter and more efficient for cardiomyocyte generation in vitro. Today, this strategy is achievable for direct conversion of mouse and human somatic cells to cardiac lineage cells (cardiomyocytes and cardiac progenitor cells), using transgene free, chemical-based approaches. Although, heart-specific partial reprogramming seems to be challenging for in vivo conversion of cardiac fibroblasts to cardiac cells, but whole organism-based in vivo partial reprogramming ameliorates cellular and physiological hallmarks of aging and prolongs lifespan in mouse. Notably, cardiac cells produced using partial reprogramming strategy can be a useful platform for disease modeling, drug screening and cardiac cell-based therapy, once the safety issues are overcome. Herein, we discuss about all progresses in de novo production of cardiac cells using partial reprogramming-based direct conversion, as well as give an overview about the potential applications of this strategy in vivo and in vitro.
Collapse
Affiliation(s)
- Mahmood Talkhabi
- Department of Animal Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| |
Collapse
|
44
|
Role of OCT4 in cancer stem-like cells and chemotherapy resistance. Biochim Biophys Acta Mol Basis Dis 2019; 1866:165432. [PMID: 30904611 DOI: 10.1016/j.bbadis.2019.03.005] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/07/2019] [Accepted: 03/17/2019] [Indexed: 02/06/2023]
Abstract
Cancer stem-like cells (CSCs) contribute to the tumorigenicity, progression, and chemoresistance of cancers. It is not known whether CSCs arise from normal stem cells or if they arise from differentiated cancer cells by acquiring self-renewal features. These CSCs share stem cell markers that normal stem cells express. There is a rising interest in octamer-binding transcription factor 4 (OCT4), one of the stem cell factors that are essential in embryogenesis and pluripotency. OCT4 is also overexpressed in CSCs of various cancers. Although the majority of the studies in CSCs reported a positive association between the expression of OCT4 and chemoresistance and an inverse correlation between OCT4 and clinical prognosis, there are studies rebuking these findings, possibly due to the sparsity of stem cells within tumors and the heterogeneity of tumors. In addition, post-translational modification of OCT4 affects its activity and warrants further investigation for its association with chemoresistance and prognosis.
Collapse
|
45
|
Identification and Characterization of the OCT4 Upstream Regulatory Region in Sus scrofa. Stem Cells Int 2019; 2019:2130973. [PMID: 30992705 PMCID: PMC6434273 DOI: 10.1155/2019/2130973] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 12/31/2018] [Accepted: 01/14/2019] [Indexed: 01/30/2023] Open
Abstract
OCT4 plays pivotal roles in maintaining pluripotency during early mammalian embryonic development and in embryonic stem cells. It is essential to establish a reporter system based on the OCT4 promoter region to study pluripotency. However, there is still a lack of information about the porcine OCT4 upstream reporter system. To improve our understanding of the porcine OCT4 regulatory region, we identified conserved regions in the porcine OCT4 promoter upstream region by sequence-based comparative analysis using various mammalian genome sequences. The similarity of nucleotide sequences in the 5′ upstream region was low among mammalian species. However, the OCT4 promoter and four regulatory regions, including distal and proximal enhancer elements, had high similarity. Next, a functional analysis of the porcine OCT4 promoter region was conducted. Luciferase reporter assay results indicated that the porcine OCT4 distal enhancer and proximal enhancer were highly activated in mouse embryonic stem cells and embryonic carcinoma cells, respectively. A comparison analysis of naïve and primed state marker gene expression in a dual-reporter assay showed that the expression levels of naïve and primed markers differed in fluorescence signal between high-expressing cells and low-expressing cells. Similar to OCT4 upstream-based reporter systems derived from other species, the porcine OCT4 upstream region-based reporter constructs showed exclusive expression patterns depending on the state of pluripotency. This work provides basic information about the porcine OCT4 upstream region and various porcine OCT4 fluorescence reporter constructs, which can be applied to study species-specific pluripotency in early embryo development and the establishment of embryonic stem cells in pigs.
Collapse
|
46
|
Han Y, Biswas D, Yoon JD, Jeon Y, Hyun SH. Effect of porcine uterus as ex vivo model of fertilizing ability and gene expression pattern on blastocysts. Theriogenology 2019; 129:146-153. [PMID: 30851478 DOI: 10.1016/j.theriogenology.2019.02.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 02/01/2019] [Accepted: 02/24/2019] [Indexed: 01/01/2023]
Abstract
The success of in vitro embryo production demonstrates that the oviduct can be bypassed during early embryonic development. Using an ex vivo model of porcine uterus is one of the strategies used to investigate fertilization within the oviductal environment. In this study, in vitro-matured porcine oocytes (MII) were fertilized with 7.5 × 107, 15 × 107, or 30 × 107 sperm cells for 20 min in the oviduct of a porcine uterine ex vivo model. MII oocytes used for in vitro fertilization (IVF) served as control 1; those cultured in the oviduct of the ex vivo model for 20 min before IVF served as control 2. In present study, the penetration rate, polyspermy, and fertilization efficiency, and accumulated reactive oxygen species (ROS) levels in the treatment groups were significantly decreased compared to those in the control 1 group. During embryonic development, the cleavage rates in the treatment groups were significantly lower than those in the control groups. The cleavage rate in the 30 × 107 sperm cell-treated group was higher than that in the 7.5 × 107 sperm cell-treated group. The blastocyst formation rate in control 1 and 2, and 30 × 107 sperm cell-treated groups increased compared to that in the 7.5 and 15 × 107 sperm cell-treated groups. PCNA, HSP70.2, and GLUT1 were upregulated in the treatment groups and POU5F1, BAX, GPX1 were upregulated in the treatment and control 2 groups, compared to the control 1 group. These results suggest that an ex vivo model may decrease the penetration rate and fertilization efficiency by increasing the accumulated ROS levels and inducing the expression of apoptosis- and stress-related genes. However, the model improved the monospermy rate and expression of embryo developmental competence genes. This is the first study that evaluates the effect of an ex vivo model of porcine uterus on fertilization parameters, and the development of porcine embryos.
Collapse
Affiliation(s)
- Yongquan Han
- Institute for Stem Cell and Regenerative Medicine (ISCRM), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea; Laboratory of Veterinary Embryology and Biotechnology (VETEMBIO), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea
| | - Dibyendu Biswas
- Institute for Stem Cell and Regenerative Medicine (ISCRM), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea; Laboratory of Veterinary Embryology and Biotechnology (VETEMBIO), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea; Department of Medicine, Surgery and Obstetrics, Faculty of Animal Science and Veterinary Medicine, Patuakhali Science and Technology University, Babugonj Campus, Barisal, 8210, Bangladesh
| | - Junchul David Yoon
- Institute for Stem Cell and Regenerative Medicine (ISCRM), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea; Laboratory of Veterinary Embryology and Biotechnology (VETEMBIO), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea
| | - Yubyeol Jeon
- Laboratory of Theriogenology and Reproductive Biotechnologies, College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeolabuk-do, 54596, Republic of Korea.
| | - Sang Hwan Hyun
- Institute for Stem Cell and Regenerative Medicine (ISCRM), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea; Laboratory of Veterinary Embryology and Biotechnology (VETEMBIO), College of Veterinary Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea.
| |
Collapse
|
47
|
Grande G, Milardi D, Martini M, Cenci T, Gulino G, Mancini F, Bianchi A, Pontecorvi A, Pierconti F. Protein Expression of PTTG-1, OCT-4, and KLF-4 in Seminoma: A Pilot Study. Front Endocrinol (Lausanne) 2019; 10:619. [PMID: 31572301 PMCID: PMC6749154 DOI: 10.3389/fendo.2019.00619] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 08/27/2019] [Indexed: 01/29/2023] Open
Abstract
Seminomas are the most frequent kind of testicular germ cell tumors (TGCTs), accounting for 50% of tumor diagnosis in young men, whereas non-seminomas account for 40% and mixed forms for 10% of cases. It is currently supposed that TGCTs evolve from a pre-invasive stage of carcinoma in situ (CIS). Octamer-binding transcription factor 4 (OCT4) is essential for self-renewal of stem cells. It is considered as a major regulator of cell pluripotency. Prior studies have shown that seminoma expresses OCT4. Transcription factor Krüppel-like factor 4 (KLF4) has moreover associated with embryonic stem cell maintenance. Finally, we previously demonstrated the expression of PTTG1 in CIS and seminomas. In this pilot study, we compared the combined expression of PTTG1 with KLF4 and OCT4 in seminoma, in order to validate our hypotesis that PTTG1 marks a specific population of stem cells in neoplastic tissue, strictly related with tumor. Formalin-fixed and paraffin-embedded testicular tissues by 5 patients who underwent an orchidectomy for seminoma have been collected and immunofluorescence analysis was performed using antibody rabbit monoclonal PTTG-1 and mouse monoclonal OCT4 or mouse monoclonal KLF4 antibody. In seminoma we observed that tumor cells strongly express OCT-4 in all seminomas and in the intratubular areas of seminoma. Expression of KLF-4 was observed in many tumor cells. PTTG1 marks some specific OCT4- and KLF4-positive tumor cells, mainly localized at the periphery of the neoplasm. In the intertubular infiltration areas nests of cells expressing both OCT4/KLF4 and PTTG1 have been observed. This is the first identification of a cell population in seminoma characterized for being OCT4, KLF4, and PTTG1 positive cells in seminoma, associated with cancer invasiveness. Further investigation is needed to elucidate if a functional abrogation of PTTG1 might be used in order to offer new therapeutic approaches in the clinical workout of seminoma.
Collapse
Affiliation(s)
- Giuseppe Grande
- Division of Endocrinology, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- International Scientific Institute Paul VI, Rome, Italy
| | - Domenico Milardi
- Division of Endocrinology, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- International Scientific Institute Paul VI, Rome, Italy
- *Correspondence: Domenico Milardi
| | - Maurizio Martini
- Division of Anatomic Pathology and Histology, School of Medicine, Catholic University of Rome, Rome, Italy
| | - Tonia Cenci
- Division of Anatomic Pathology and Histology, School of Medicine, Catholic University of Rome, Rome, Italy
| | - Gaetano Gulino
- Department of Urology, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | | | - Antonio Bianchi
- Division of Endocrinology, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | - Alfredo Pontecorvi
- Division of Endocrinology, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- International Scientific Institute Paul VI, Rome, Italy
| | - Francesco Pierconti
- Division of Anatomic Pathology and Histology, School of Medicine, Catholic University of Rome, Rome, Italy
| |
Collapse
|
48
|
Bhakta M, Padanad MS, Harris JP, Lubczyk C, Amatruda JF, Munshi NV. pouC Regulates Expression of bmp4 During Atrioventricular Canal Formation in Zebrafish. Dev Dyn 2018; 248:173-188. [PMID: 30444277 DOI: 10.1002/dvdy.2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 10/04/2018] [Accepted: 10/24/2018] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Many human gene mutations have been linked to congenital heart disease (CHD), yet CHD remains a major health issue worldwide due in part to an incomplete understanding of the molecular basis for cardiac malformation. RESULTS Here we identify the orthologous mouse Pou6f1 and zebrafish pouC as POU homeodomain transcription factors enriched in the developing heart. We find that pouC is a multi-functional transcriptional regulator containing separable activation, repression, protein-protein interaction, and DNA binding domains. Using zebrafish heart development as a model system, we demonstrate that pouC knockdown impairs cardiac morphogenesis and affects cardiovascular function. We also find that levels of pouC expression must be fine-tuned to enable proper heart formation. At the cellular level, we demonstrate that pouC knockdown disrupts atrioventricular canal (AVC) cardiomyocyte maintenance, although chamber myocyte specification remains intact. Mechanistically, we show that pouC binds a bmp4 intronic regulatory element to mediate transcriptional activation. CONCLUSIONS Taken together, our study establishes pouC as a novel transcriptional input into the regulatory hierarchy that drives AVC morphogenesis in zebrafish. We anticipate that these findings will inform future efforts to explore functional conservation in mammals and potential association with atrioventricular septal defects in humans. Developmental Dynamics 248:173-188, 2019. © 2018 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Minoti Bhakta
- Department of Internal Medicine - Cardiology, UT Southwestern Medical Center, Dallas, Texas
| | - Mahesh S Padanad
- Department of Internal Medicine - Cardiology, UT Southwestern Medical Center, Dallas, Texas
| | - John P Harris
- Department of Internal Medicine - Cardiology, UT Southwestern Medical Center, Dallas, Texas
| | - Christina Lubczyk
- Department of Internal Medicine - Cardiology, UT Southwestern Medical Center, Dallas, Texas
| | - James F Amatruda
- Department of Pediatrics, UT Southwestern Medical Center, Dallas, Texas.,Department of Molecular Biology, UT Southwestern Medical Center, Dallas, Texas
| | - Nikhil V Munshi
- Department of Internal Medicine - Cardiology, UT Southwestern Medical Center, Dallas, Texas.,Department of Molecular Biology, UT Southwestern Medical Center, Dallas, Texas.,McDermott Center for Human Growth and Development, UT Southwestern Medical Center, Dallas, Texas.,Center for Regenerative Science and Medicine, UT Southwestern Medical Center, Dallas, Texas
| |
Collapse
|
49
|
Wu F, Wu Q, Li D, Zhang Y, Wang R, Liu Y, Li W. Oct4 regulates DNA methyltransferase 1 transcription by direct binding of the regulatory element. Cell Mol Biol Lett 2018; 23:39. [PMID: 30140294 PMCID: PMC6097287 DOI: 10.1186/s11658-018-0104-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 08/01/2018] [Indexed: 12/23/2022] Open
Abstract
Background The transcription factor Oct4 plays a pivotal role in the pre-implantation development of the mouse embryo. DNA methyltransferase 1 (Dnmt1) maintains the changes in DNA methylation during mammalian early embryonic development. Little is known of the role of Oct4 in DNA methylation in mice. In this study, Kunming white mice were used as an animal model to reveal any correlation between DNA methylation and Oct4 during mammalian embryonic development. Results The expressions of Dnmt1 and Oct4 were initially studied using real-time PCR. They exhibited different patterns during the pre-implantation stage. Moreover, by using a promoter assay and ChIP analysis, we found that the transcriptional activities of Dnmt1 in mouse NIH/3 T3 cells and CCE cells were regulated by Oct4 through direct binding to the - 554 to - 294 fragment of the upstream regulation element of Dnmt1. The downregulation of Dnmt1 expression and enzyme activity by mouse Oct4 were further confirmed by transfecting Oct4 siRNA into mouse CCE cells. Conclusion Our results indicate that Oct4 is involved in DNA methylation through the regulation of Dnmt1 transcription, especially during the early stages of mouse pre-implantation embryo development.
Collapse
Affiliation(s)
- Fengrui Wu
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| | - Qingqing Wu
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| | - Dengkun Li
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| | - Yuan Zhang
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| | - Rong Wang
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| | - Yong Liu
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| | - Wenyong Li
- 1Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China.,2Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Fuyang, China
| |
Collapse
|
50
|
Mai T, Markov GJ, Brady JJ, Palla A, Zeng H, Sebastiano V, Blau HM. NKX3-1 is required for induced pluripotent stem cell reprogramming and can replace OCT4 in mouse and human iPSC induction. Nat Cell Biol 2018; 20:900-908. [PMID: 30013107 PMCID: PMC6101038 DOI: 10.1038/s41556-018-0136-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 06/04/2018] [Indexed: 12/21/2022]
Abstract
Reprogramming somatic cells to induced pluripotent stem cells (iPSCs) is now routinely accomplished by overexpression of the four Yamanaka factors (OCT4, SOX2, KLF4, MYC (or OSKM))1. These iPSCs can be derived from patients' somatic cells and differentiated toward diverse fates, serving as a resource for basic and translational research. However, mechanistic insights into regulators and pathways that initiate the pluripotency network remain to be resolved. In particular, naturally occurring molecules that activate endogenous OCT4 and replace exogenous OCT4 in human iPSC reprogramming have yet to be found. Using a heterokaryon reprogramming system we identified NKX3-1 as an early and transiently expressed homeobox transcription factor. Following knockdown of NKX3-1, iPSC reprogramming is abrogated. NKX3-1 functions downstream of the IL-6-STAT3 regulatory network to activate endogenous OCT4. Importantly, NKX3-1 substitutes for exogenous OCT4 to reprogram both mouse and human fibroblasts at comparable efficiencies and generate fully pluripotent stem cells. Our findings establish an essential role for NKX3-1, a prostate-specific tumour suppressor, in iPSC reprogramming.
Collapse
Affiliation(s)
- Thach Mai
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA.,Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA
| | - Glenn J Markov
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA.,Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA
| | - Jennifer J Brady
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA.,Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA.,23andMe Inc, Mountain View, CA, USA
| | - Adelaida Palla
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA.,Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA
| | - Hong Zeng
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA.,Department of Obstetrics and Gynecology, Stanford School of Medicine, Stanford, CA, USA
| | - Vittorio Sebastiano
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA.,Department of Obstetrics and Gynecology, Stanford School of Medicine, Stanford, CA, USA
| | - Helen M Blau
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA. .,Institute for Stem Cell Biology and Regenerative Medicine, Stanford, CA, USA.
| |
Collapse
|