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Wang M, Zhang TH, Li Y, Chen X, Zhang Q, Zheng Y, Long D, Cheng X, Hong A, Yang X, Wang G. Atractylenolide-I Alleviates Hyperglycemia-Induced Heart Developmental Malformations through Direct and Indirect Modulation of the STAT3 Pathway. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 129:155698. [PMID: 38728919 DOI: 10.1016/j.phymed.2024.155698] [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: 01/30/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/12/2024]
Abstract
BACKGROUND Gestational diabetes could elevate the risk of congenital heart defects (CHD) in infants, and effective preventive and therapeutic medications are currently lacking. Atractylenolide-I (AT-I) is the active ingredient of Atractylodes Macrocephala Koidz (known as Baizhu in China), which is a traditional pregnancy-supporting Chinese herb. PURPOSE In this study, we investigated the protective effect of AT-I on the development of CHD in embryos exposed to high glucose (HG). STUDY DESIGN AND METHODS First, systematic review search results revealed associations between gestational diabetes mellitus (GDM) and cardiovascular malformations. Subsequently, a second systematic review indicated that heart malformations were consistently associated with oxidative stress and cell apoptosis. We assessed the cytotoxic impacts of Atractylenolide compounds (AT-I, AT-II, and AT-III) on H9c2 cells and chick embryos, determining an optimal concentration of AT-I for further investigation. Second, immunofluorescence, western blot, Polymerase Chain Reaction (PCR), and flow cytometry were utilized to delve into the mechanisms through which AT-I mitigates oxidative stress and apoptosis in cardiac cells. Molecular docking was employed to investigate whether AT-I exerts cardioprotective effects via the STAT3 pathway. Then, we developed a streptozotocin-induced diabetes mellitus (PGDM) mouse model to evaluate AT-I's protective efficacy in mammals. Finally, we explored how AT-I protects hyperglycemia-induced abnormal fetal heart development through microbiota analysis and untargeted metabolomics analysis. RESULTS The study showed the protective effect of AT-I on embryonic development using a chick embryo model which rescued the increase in the reactive oxygen species (ROS) and decrease in cell survival induced by HG. We also provided evidence suggesting that AT-I might directly interact with STAT3, inhibiting its phosphorylation. Further, in the PGDM mouse model, we observed that AT-I not only partially alleviated PGDM-related blood glucose issues and complications but also mitigated hyperglycemia-induced abnormal fetal heart development in pregnant mice. This effect is hypothesized to be mediated through alterations in gut microbiota composition. We proposed that dysregulation in microbiota metabolism could influence the downstream STAT3 signaling pathway via EGFR, consequently impacting cardiac development and formation. CONCLUSIONS This study marks the first documented instance of AT-I's effectiveness in reducing the risk of early cardiac developmental anomalies in fetuses affected by gestational diabetes. AT-I achieves this by inhibiting the STAT3 pathway activated by ROS during gestational diabetes, significantly reducing the risk of fetal cardiac abnormalities. Notably, AT-I also indirectly safeguards normal fetal cardiac development by influencing the maternal gut microbiota and suppressing the EGFR/STAT3 pathway.
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Affiliation(s)
- Mengwei Wang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Department of Cell Biology, College of Life Science and Technology, Jinan University; National Engineering Research Center of Genetic Medicine; Guangdong Provincial Key Laboratory of Bioengineering Medicine; Guangdong Provincial Biotechnology Drug & Engineering Technology Research Center, Jinan University, Guangzhou, 510632, China
| | - Tong-Hua Zhang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Shenzhen Traditional Chinese Medicine Hospital, Shenzhen 518033, China
| | - Yunjin Li
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Jinan University, Guangzhou 510632, China
| | - Xiaofeng Chen
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Jinan University, Guangzhou 510632, China
| | - Qiongyin Zhang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Jinan University, Guangzhou 510632, China
| | - Ying Zheng
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Jinan University, Guangzhou 510632, China
| | - Denglu Long
- The First Affiliated Hospital of Jinan University, Guangzhou 510632, China
| | - Xin Cheng
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China
| | - An Hong
- Department of Cell Biology, College of Life Science and Technology, Jinan University; National Engineering Research Center of Genetic Medicine; Guangdong Provincial Key Laboratory of Bioengineering Medicine; Guangdong Provincial Biotechnology Drug & Engineering Technology Research Center, Jinan University, Guangzhou, 510632, China
| | - Xuesong Yang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Clinical Research Center, Clifford Hospital, Guangzhou 511495, China.
| | - Guang Wang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, School of Medicine, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Jinan University, Guangzhou 510632, China; Guangdong-Hong Kong Metabolism & Reproduction Joint Laboratory, Guangdong Second Provincial General Hospital, School of Medicine, Jinan University, Guangzhou 510317.
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Stage HJ, Trappe S, Söllig K, Trachsel DS, Kirsch K, Zieger C, Merle R, Aschenbach JR, Gehlen H. Multilineage Differentiation Potential of Equine Adipose-Derived Stromal/Stem Cells from Different Sources. Animals (Basel) 2023; 13:ani13081352. [PMID: 37106915 PMCID: PMC10135324 DOI: 10.3390/ani13081352] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/06/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
The investigation of multipotent stem/stromal cells (MSCs) in vitro represents an important basis for translational studies in large animal models. The study's aim was to examine and compare clinically relevant in vitro properties of equine MSCs, which were isolated from abdominal (abd), retrobulbar (rb) and subcutaneous (sc) adipose tissue by collagenase digestion (ASCs-SVF) and an explant technique (ASCs-EXP). Firstly, we examined proliferation and trilineage differentiation and, secondly, the cardiomyogenic differentiation potential using activin A, bone morphogenetic protein-4 and Dickkopf-1. Fibroblast-like, plastic-adherent ASCs-SVF and ASCs-EXP were obtained from all sources. The proliferation and chondrogenic differentiation potential did not differ significantly between the isolation methods and localizations. However, abd-ASCs-EXP showed the highest adipogenic differentiation potential compared to rb- and sc-ASCs-EXP on day 7 and abd-ASCs-SVF a higher adipogenic potential compared to abd-ASCs-EXP on day 14. Osteogenic differentiation potential was comparable at day 14, but by day 21, abd-ASCs-EXP demonstrated a higher osteogenic potential compared to abd-ASCs-SVF and rb-ASCs-EXP. Cardiomyogenic differentiation could not be achieved. This study provides insight into the proliferation and multilineage differentiation potential of equine ASCs and is expected to provide a basis for future preclinical and clinical studies in horses.
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Affiliation(s)
- Hannah J Stage
- Equine Clinic, Surgery and Radiology, Department of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - Susanne Trappe
- Institute of Veterinary Physiology, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - Katharina Söllig
- Institute of Veterinary Physiology, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - Dagmar S Trachsel
- Clinical Unit of Equine Internal Medicine, Department for Companion Animals and Horses, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, Austria
| | - Katharina Kirsch
- Institute of Veterinary Physiology, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - Cornelia Zieger
- Institute of Veterinary Pathology Department of Veterinary Medicine, Freie Universität Berlin, Robert-von-Ostertag-Straße 15, 14163 Berlin, Germany
| | - Roswitha Merle
- Institute for Veterinary Epidemiology and Biostatistics, Department of Veterinary Medicine, Freie Universität Berlin, Königsweg 67, 14163 Berlin, Germany
| | - Jörg R Aschenbach
- Institute of Veterinary Physiology, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - Heidrun Gehlen
- Equine Clinic, Surgery and Radiology, Department of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
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Taverne YJHJ, Sadeghi A, Bartelds B, Bogers AJJC, Merkus D. Right ventricular phenotype, function, and failure: a journey from evolution to clinics. Heart Fail Rev 2020; 26:1447-1466. [PMID: 32556672 PMCID: PMC8510935 DOI: 10.1007/s10741-020-09982-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The right ventricle has long been perceived as the "low pressure bystander" of the left ventricle. Although the structure consists of, at first glance, the same cardiomyocytes as the left ventricle, it is in fact derived from a different set of precursor cells and has a complex three-dimensional anatomy and a very distinct contraction pattern. Mechanisms of right ventricular failure, its detection and follow-up, and more specific different responses to pressure versus volume overload are still incompletely understood. In order to fully comprehend right ventricular form and function, evolutionary biological entities that have led to the specifics of right ventricular physiology and morphology need to be addressed. Processes responsible for cardiac formation are based on very ancient cardiac lineages and within the first few weeks of fetal life, the human heart seems to repeat cardiac evolution. Furthermore, it appears that most cardiogenic signal pathways (if not all) act in combination with tissue-specific transcriptional cofactors to exert inductive responses reflecting an important expansion of ancestral regulatory genes throughout evolution and eventually cardiac complexity. Such molecular entities result in specific biomechanics of the RV that differs from that of the left ventricle. It is clear that sole descriptions of right ventricular contraction patterns (and LV contraction patterns for that matter) are futile and need to be addressed into a bigger multilayer three-dimensional picture. Therefore, we aim to present a complete picture from evolution, formation, and clinical presentation of right ventricular (mal)adaptation and failure on a molecular, cellular, biomechanical, and (patho)anatomical basis.
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Affiliation(s)
- Yannick J H J Taverne
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, Room Rg627, Dr. Molewaterplein 40, 3015, GD, Rotterdam, The Netherlands. .,Division of Experimental Cardiology, Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands. .,Unit for Cardiac Morphology and Translational Electrophysiology, Erasmus University Medical Center, Rotterdam, The Netherlands.
| | - Amir Sadeghi
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, Room Rg627, Dr. Molewaterplein 40, 3015, GD, Rotterdam, The Netherlands
| | - Beatrijs Bartelds
- Division of Pediatrics, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Ad J J C Bogers
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, Room Rg627, Dr. Molewaterplein 40, 3015, GD, Rotterdam, The Netherlands
| | - Daphne Merkus
- Division of Experimental Cardiology, Department of Cardiology, Erasmus University Medical Center, Rotterdam, The Netherlands
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Okano S, Shiba Y. Therapeutic Potential of Pluripotent Stem Cells for Cardiac Repair after Myocardial Infarction. Biol Pharm Bull 2019; 42:524-530. [PMID: 30930411 DOI: 10.1248/bpb.b18-00257] [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] [Indexed: 11/22/2022]
Abstract
Myocardial infarction occurs as a result of acute arteriosclerotic plaque rupture in the coronary artery, triggering strong inflammatory responses. The necrotic cardiomyocytes are gradually replaced with noncontractile scar tissue that eventually manifests as heart failure. Pluripotent stem cells (PSCs) show great promise for widespread clinical applications, particularly for tissue regeneration, and are being actively studied around the world to help elucidate disease mechanisms and in the development of new drugs. Human induced PSCs also show potential for regeneration of the myocardial tissue in experiments with small animals and in in vitro studies. Although emerging evidence points to the effectiveness of these stem cell-derived cardiomyocytes in cardiac regeneration, several challenges remain before clinical application can become a reality. Here, we provide an overview of the present state of PSC-based heart regeneration and highlight the remaining hurdles, with a particular focus on graft survival, immunogenicity, posttransplant arrhythmia, maintained function, and tumor formation. Rapid progress in this field along with advances in biotechnology are expected to resolve these issues, which will require international collaboration and standardization.
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Affiliation(s)
- Satomi Okano
- Department of Regenerative Science and Medicine, Shinshu University.,Institute for Biomedical Sciences, Shinshu University
| | - Yuji Shiba
- Department of Regenerative Science and Medicine, Shinshu University.,Institute for Biomedical Sciences, Shinshu University.,Department of Cardiovascular Medicine, Shinshu University
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Kim YH, Kim BJ, Kim SM, Kim SU, Ryu BY. Induction of cardiomyocyte‑like cells from hair follicle cells in mice. Int J Mol Med 2019; 43:2230-2240. [PMID: 30864673 DOI: 10.3892/ijmm.2019.4133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 03/08/2019] [Indexed: 11/05/2022] Open
Abstract
Hair follicles (HFs) are a well‑characterized niche for adult stem cells (SCs), and include epithelial and melanocytic SCs. HF cells are an accessible source of multipotent adult SCs for the generation of the interfollicular epidermis, HF structures and sebaceous glands in addition to the reconstitution of novel HFs in vivo. In the present study, it was demonstrated that HF cells are able to be induced to differentiate into cardiomyocyte‑like cells in vitro under specific conditions. It was determined that HF cells cultured on OP9 feeder cells in KnockOut‑Dulbecco's modified Eagle's medium/B27 in the presence of vascular endothelial growth factors differentiated into cardiomyocyte‑like cells that express markers specific to cardiac lineage, but do not express non‑cardiac lineage markers including neural stem/progenitor cell, HF bulge cells or undifferentiated spermatogonia markers. These cardiomyocyte‑like cells exhibited a spindle‑ and filament‑shaped morphology similar to that presented by cardiac muscles and exhibited spontaneous beating that persisted for over 3 months. These results demonstrate that SC reprogramming and differentiation may be induced without resulting in any genetic modification, which is important for the clinical applications of SCs including tissue and organ regeneration.
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Affiliation(s)
- Yong-Hee Kim
- Department of Animal Science and Technology, College of Biotechnology and Natural Resources, Chung‑Ang University, Anseong, Gyeonggi‑do 17546, Republic of Korea
| | - Bang-Jin Kim
- Department of Cancer Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Seok-Man Kim
- Department of Animal Science and Technology, College of Biotechnology and Natural Resources, Chung‑Ang University, Anseong, Gyeonggi‑do 17546, Republic of Korea
| | - Sun-Uk Kim
- National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, Chungcheongbuk‑do 28116, Republic of Korea
| | - Buom-Yong Ryu
- Department of Animal Science and Technology, College of Biotechnology and Natural Resources, Chung‑Ang University, Anseong, Gyeonggi‑do 17546, Republic of Korea
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6
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Kim BJ, Kim YH, Lee YA, Jung SE, Hong YH, Lee EJ, Kim BG, Hwang S, Do JT, Pang MG, Ryu BY. Platelet-derived growth factor receptor-alpha positive cardiac progenitor cells derived from multipotent germline stem cells are capable of cardiomyogenesis in vitro and in vivo. Oncotarget 2018; 8:29643-29656. [PMID: 28410244 PMCID: PMC5444692 DOI: 10.18632/oncotarget.16772] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Accepted: 02/28/2017] [Indexed: 01/12/2023] Open
Abstract
Cardiac cell therapy has the potential to revolutionize treatment of heart diseases, but its success hinders on the development of a stem cell therapy capable of efficiently producing functionally differentiated cardiomyocytes. A key to unlocking the therapeutic application of stem cells lies in understanding the molecular mechanisms that govern the differentiation process. Here we report that a population of platelet-derived growth factor receptor alpha (PDGFRA) cells derived from mouse multipotent germline stem cells (mGSCs) were capable of undergoing cardiomyogenesis in vitro. Cells derived in vitro from PDGFRA positive mGSCs express significantly higher levels of cardiac marker proteins compared to PDGFRA negative mGSCs. Using Pdgfra shRNAs to investigate the dependence of Pdgfra on cardiomyocyte differentiation, we observed that Pdgfra silencing inhibited cardiac differentiation. In a rat myocardial infarction (MI) model, transplantation of a PDGFRAenriched cell population into the rat heart readily underwent functional differentiation into cardiomyocytes and reduced areas of fibrosis associated with MI injury. Together, these results suggest that mGSCs may provide a unique source of cardiac stem/progenitor cells for future regenerative therapy of damaged heart tissue.
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Affiliation(s)
- Bang-Jin Kim
- Department of Animal Science & Technology, Chung-Ang University, Anseong, Republic of Korea.,Department of Cancer Biology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Yong-Hee Kim
- Department of Animal Science & Technology, Chung-Ang University, Anseong, Republic of Korea
| | - Yong-An Lee
- Laboratory of Bioimaging Probe Development, Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore
| | - Sang-Eun Jung
- Department of Animal Science & Technology, Chung-Ang University, Anseong, Republic of Korea
| | - Yeong Ho Hong
- Department of Animal Science & Technology, Chung-Ang University, Anseong, Republic of Korea
| | - Eun-Ju Lee
- Department of Internal medicine, Seoul National University, Seoul, Republic of Korea
| | - Byung-Gak Kim
- Bio Environment Technology Research Institute, Chung-Ang University, Anseong, Republic of Korea
| | - Seongsoo Hwang
- Animal Biotechnology Division, National Institute of Animal Science, Jeollabuk-do, Republic of Korea
| | - Jeong Tae Do
- Department of Stem Cell and Regenerative Biology, College of Animal Bioscience and Technology, Konkuk University, Seoul, Republic of Korea
| | - Myung-Geol Pang
- Department of Animal Science & Technology, Chung-Ang University, Anseong, Republic of Korea
| | - Buom-Yong Ryu
- Department of Animal Science & Technology, Chung-Ang University, Anseong, Republic of Korea
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7
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Abstract
Background Ebstein anomaly (EA) is a rare congenital defect characterized by apical displacement of the septal tricuspid leaflets and atrialization of the right ventricle. The etiology of EA is unclear; however, recurrence in families and the association of EA with genetic syndromes and copy number variants (CNVs) suggest a genetic component. Objective We performed a population-based study to search for recurrent and novel CNVs in a previously unreported set of EA cases. Methods We genotyped 60 EA cases identified from all live births (2,891,076) from selected California counties (1991–2010) using the Illumina HumanOmni2.5–8 array. We identified 38 candidate CNVs in 28 (46%) cases and prioritized and validated 11 CNVs based on the genes included. Results Five CNVs (41%) overlapped or were close to genes involved in early myocardial development, including NODAL, PDLIM5, SIX1, ASF1A and FGF12. We also replicated a previous association of EA with CNVs at 1p34.1 and AKAP12. Finally, we identified four CNVs overlapping or in close proximity to the transcription factors HES3, TRIM71, CUX1 and EIF4EBP2. Conclusions This study supports the relationship of genetic factors to EA and demonstrates that defects in cardiomyocytes and myocardium differentiation may play a role. Abnormal differentiation of cardiomyocytes and how genetic factors contribute should be examined for their association with EA.
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Hwang GH, Park SM, Han HJ, Kim JS, Yun SP, Ryu JM, Lee HJ, Chang W, Lee SJ, Choi JH, Choi JS, Lee MY. Purification of small molecule-induced cardiomyocytes from human induced pluripotent stem cells using a reporter system. J Cell Physiol 2017; 232:3384-3395. [PMID: 28063225 DOI: 10.1002/jcp.25783] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/29/2016] [Accepted: 01/05/2017] [Indexed: 11/08/2022]
Abstract
In order to realize the practical use of human pluripotent stem cell (hPSC)-derived cardiomyocytes for the purpose of clinical use or cardiovascular research, the generation of large numbers of highly purified cardiomyocytes should be achieved. Here, we show an efficient method for cardiac differentiation of human induced pluripotent stem cells (hiPSCs) in chemically defined conditions and purification of hiPSC-derived cardiomyocytes using a reporter system. Regulation of the Wnt/β-catenin signaling pathway is implicated in the induction of the cardiac differentiation of hPSCs. We increased cardiac differentiation efficiency of hiPSCs in chemically defined conditions through combined treatment with XAV939, a tankyrase inhibitor and IWP2, a porcupine inhibitor and optimized concentrations. Although cardiac differentiation efficiency was high (>80%), it was difficult to suppress differentiation into non-cardiac cells, Therefore, we applied a lentiviral reporter system, wherein green fluorescence protein (GFP) and Zeocin-resistant gene are driven by promoter activation of a gene (TNNT2) encoding cardiac troponin T (cTnT), a cardiac-specific protein, to exclude non-cardiomyocytes from differentiated cell populations. We transduced this reporter construct into differentiated cells using a lentiviral vector and then obtained highly purified hiPSC-derived cardiomyocytes by treatment with the lowest effective dose of Zeocin. We significantly increased transgenic efficiency through manipulation of the cells in which the differentiated cells were simultaneously infected with virus and re-plated after single-cell dissociation. Purified cells specifically expressed GFP, cTnT, displayed typical properties of cardiomyocytes. This study provides an efficient strategy for obtaining large quantities of highly purified hPSC-derived cardiomyocytes for application in regenerative medicine and biomedical research.
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Affiliation(s)
- Geun Hye Hwang
- College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
| | - So Mi Park
- College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
| | - Ho Jae Han
- College of Veterinary Medicine, Seoul National University, Seoul, Korea
| | - Joong Sun Kim
- Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Korea
| | - Seung Pil Yun
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Jung Min Ryu
- Department of Veterinary Physiology, College of Veterinary Medicine, Chonnam National University, Gwangju, Korea
| | - Ho Jin Lee
- Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut
| | - Woochul Chang
- Department of Biology Education, College of Education, Pusan National University, Busan, Korea
| | - Su-Jin Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon, Gyeonggi-do, Korea
| | - Jeong-Hee Choi
- College of Pharmacy, The Catholic University of Korea, Bucheon, Gyeonggi-do, Korea
| | - Jin-Sung Choi
- College of Pharmacy, The Catholic University of Korea, Bucheon, Gyeonggi-do, Korea
| | - Min Young Lee
- College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
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Activin A Modulates CRIPTO-1/HNF4 α+ Cells to Guide Cardiac Differentiation from Human Embryonic Stem Cells. Stem Cells Int 2017; 2017:4651238. [PMID: 28163723 PMCID: PMC5253508 DOI: 10.1155/2017/4651238] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 10/29/2016] [Accepted: 12/01/2016] [Indexed: 01/02/2023] Open
Abstract
The use of human pluripotent stem cells in basic and translational cardiac research requires efficient differentiation protocols towards cardiomyocytes. In vitro differentiation yields heterogeneous populations of ventricular-, atrial-, and nodal-like cells hindering their potential applications in regenerative therapies. We described the effect of the growth factor Activin A during early human embryonic stem cell fate determination in cardiac differentiation. Addition of high levels of Activin A during embryoid body cardiac differentiation augmented the generation of endoderm derivatives, which in turn promoted cardiomyocyte differentiation. Moreover, a dose-dependent increase in the coreceptor expression of the TGF-β superfamily member CRIPTO-1 was observed in response to Activin A. We hypothesized that interactions between cells derived from meso- and endodermal lineages in embryoid bodies contributed to improved cell maturation in early stages of cardiac differentiation, improving the beating frequency and the percentage of contracting embryoid bodies. Activin A did not seem to affect the properties of cardiomyocytes at later stages of differentiation, measuring action potentials, and intracellular Ca2+ dynamics. These findings are relevant for improving our understanding on human heart development, and the proposed protocol could be further explored to obtain cardiomyocytes with functional phenotypes, similar to those observed in adult cardiac myocytes.
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10
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Wittig JG, Münsterberg A. The Early Stages of Heart Development: Insights from Chicken Embryos. J Cardiovasc Dev Dis 2016; 3:jcdd3020012. [PMID: 29367563 PMCID: PMC5715676 DOI: 10.3390/jcdd3020012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 03/28/2016] [Accepted: 03/30/2016] [Indexed: 01/01/2023] Open
Abstract
The heart is the first functioning organ in the developing embryo and a detailed understanding of the molecular and cellular mechanisms involved in its formation provides insights into congenital malformations affecting its function and therefore the survival of the organism. Because many developmental mechanisms are highly conserved, it is possible to extrapolate from observations made in invertebrate and vertebrate model organisms to humans. This review will highlight the contributions made through studying heart development in avian embryos, particularly the chicken. The major advantage of chick embryos is their accessibility for surgical manipulation and functional interference approaches, both gain- and loss-of-function. In addition to experiments performed in ovo, the dissection of tissues for ex vivo culture, genomic, or biochemical approaches is straightforward. Furthermore, embryos can be cultured for time-lapse imaging, which enables tracking of fluorescently labeled cells and detailed analysis of tissue morphogenesis. Owing to these features, investigations in chick embryos have led to important discoveries, often complementing genetic studies in mice and zebrafish. As well as including some historical aspects, we cover here some of the crucial advances made in understanding early heart development using the chicken model.
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Affiliation(s)
- Johannes G Wittig
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.
| | - Andrea Münsterberg
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.
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Ladd AN. New Insights Into the Role of RNA-Binding Proteins in the Regulation of Heart Development. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2016; 324:125-85. [PMID: 27017008 DOI: 10.1016/bs.ircmb.2015.12.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The regulation of gene expression during development takes place both at the transcriptional and posttranscriptional levels. RNA-binding proteins (RBPs) regulate pre-mRNA processing, mRNA localization, stability, and translation. Many RBPs are expressed in the heart and have been implicated in heart development, function, or disease. This chapter will review the current knowledge about RBPs in the developing heart, focusing on those that regulate posttranscriptional gene expression. The involvement of RBPs at each stage of heart development will be considered in turn, including the establishment of specific cardiac cell types and formation of the primitive heart tube, cardiac morphogenesis, and postnatal maturation and aging. The contributions of RBPs to cardiac birth defects and heart disease will also be considered in these contexts. Finally, the interplay between RBPs and other regulatory factors in the developing heart, such as transcription factors and miRNAs, will be discussed.
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Affiliation(s)
- A N Ladd
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, United States of America.
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12
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Takasato M, Little MH. The origin of the mammalian kidney: implications for recreating the kidney in vitro. Development 2015; 142:1937-47. [PMID: 26015537 DOI: 10.1242/dev.104802] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The mammalian kidney, the metanephros, is a mesodermal organ classically regarded as arising from the intermediate mesoderm (IM). Indeed, both the ureteric bud (UB), which gives rise to the ureter and the collecting ducts, and the metanephric mesenchyme (MM), which forms the rest of the kidney, derive from the IM. Based on an understanding of the signalling molecules crucial for IM patterning and kidney morphogenesis, several studies have now generated UB or MM, or both, in vitro via the directed differentiation of human pluripotent stem cells. Although these results support the IM origin of the UB and the MM, they challenge the simplistic view of a common progenitor for these two populations, prompting a reanalysis of early patterning events within the IM. Here, we review our understanding of the origin of the UB and the MM in mouse, and discuss how this impacts on kidney regeneration strategies and furthers our understanding of human development.
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Affiliation(s)
- Minoru Takasato
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria 3052, Australia
| | - Melissa H Little
- Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria 3052, Australia
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13
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Blech-Hermoni Y, Ladd AN. RNA binding proteins in the regulation of heart development. Int J Biochem Cell Biol 2013; 45:2467-78. [PMID: 23973289 DOI: 10.1016/j.biocel.2013.08.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 08/09/2013] [Accepted: 08/13/2013] [Indexed: 11/28/2022]
Abstract
In vivo, RNA molecules are constantly accompanied by RNA binding proteins (RBPs), which are intimately involved in every step of RNA biology, including transcription, editing, splicing, transport and localization, stability, and translation. RBPs therefore have opportunities to shape gene expression at multiple levels. This capacity is particularly important during development, when dynamic chemical and physical changes give rise to complex organs and tissues. This review discusses RBPs in the context of heart development. Since the targets and functions of most RBPs--in the heart and at large--are not fully understood, this review focuses on the expression and roles of RBPs that have been implicated in specific stages of heart development or developmental pathology. RBPs are involved in nearly every stage of cardiogenesis, including the formation, morphogenesis, and maturation of the heart. A fuller understanding of the roles and substrates of these proteins could ultimately provide attractive targets for the design of therapies for congenital heart defects, cardiovascular disease, or cardiac tissue repair.
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Affiliation(s)
- Yotam Blech-Hermoni
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; Program in Cell Biology, Department of Molecular Biology and Microbiology, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
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14
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Steering signal transduction pathway towards cardiac lineage from human pluripotent stem cells: A review. Cell Signal 2013; 25:1096-107. [DOI: 10.1016/j.cellsig.2013.01.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2012] [Accepted: 01/25/2013] [Indexed: 10/27/2022]
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15
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Abstract
When amniotes appeared during evolution, embryos freed themselves from intracellular nutrition; development slowed, the mid-blastula transition was lost and maternal components became less important for polarity. Extra-embryonic tissues emerged to provide nutrition and other innovations. One such tissue, the hypoblast (visceral endoderm in mouse), acquired a role in fixing the body plan: it controls epiblast cell movements leading to primitive streak formation, generating bilateral symmetry. It also transiently induces expression of pre-neural markers in the epiblast, which also contributes to delay streak formation. After gastrulation, the hypoblast might protect prospective forebrain cells from caudalizing signals. These functions separate mesendodermal and neuroectodermal domains by protecting cells against being caught up in the movements of gastrulation.
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Affiliation(s)
- Claudio D Stern
- Department of Cell and Developmental Biology, University College London, GowerStreet (Anatomy Building), London WC1E 6BT, UK.
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16
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Taubenschmid J, Weitzer G. Mechanisms of cardiogenesis in cardiovascular progenitor cells. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2012; 293:195-267. [PMID: 22251563 PMCID: PMC7615846 DOI: 10.1016/b978-0-12-394304-0.00012-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Self-renewing cells of the vertebrate heart have become a major subject of interest in the past decade. However, many researchers had a hard time to argue against the orthodox textbook view that defines the heart as a postmitotic organ. Once the scientific community agreed on the existence of self-renewing cells in the vertebrate heart, their origin was again put on trial when transdifferentiation, dedifferentiation, and reprogramming could no longer be excluded as potential sources of self-renewal in the adult organ. Additionally, the presence of self-renewing pluripotent cells in the peripheral blood challenges the concept of tissue-specific stem and progenitor cells. Leaving these unsolved problems aside, it seems very desirable to learn about the basic biology of this unique cell type. Thus, we shall here paint a picture of cardiovascular progenitor cells including the current knowledge about their origin, basic nature, and the molecular mechanisms guiding proliferation and differentiation into somatic cells of the heart.
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Affiliation(s)
- Jasmin Taubenschmid
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Medical University of Vienna, Vienna, Austria
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17
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Liebau S, Tischendorf M, Ansorge D, Linta L, Stockmann M, Weidgang C, Iacovino M, Boeckers T, von Wichert G, Kyba M, Kleger A. An inducible expression system of the calcium-activated potassium channel 4 to study the differential impact on embryonic stem cells. Stem Cells Int 2011; 2011:456815. [PMID: 21941566 PMCID: PMC3173888 DOI: 10.4061/2011/456815] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Accepted: 06/14/2011] [Indexed: 11/20/2022] Open
Abstract
Rationale. The family of calcium-activated potassium channels consists of four members with varying biological functions and conductances. Besides membrane potential modulation, SK channels have been found to be involved in cardiac pacemaker cell development from ES cells and morphological shaping of neural stem cells. Objective. Distinct SK channel subtype expression in ES cells might elucidate their precise impact during cardiac development. We chose SK channel subtype 4 as a potential candidate influencing embryonic stem cell differentiation. Methods. We generated a doxycycline inducible mouse ES cell line via targeted homologous recombination of a cassette expressing a bicistronic construct encoding SK4 and a fluorophore from the murine HPRT locus. Conclusion. We characterized the mouse ES cell line iSK4-AcGFP. The cassette is readily expressed under the control of doxycycline, and the overexpression of SK4 led to an increase in cardiac and pacemaker cell differentiation thereby serving as a unique tool to characterize the cell biological variances due to specific SK channel overexpression.
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Affiliation(s)
- Stefan Liebau
- Institute for Anatomy and Cell Biology, Ulm University, 89081 Ulm, Germany
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18
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Liu W, Foley AC. Signaling pathways in early cardiac development. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2011; 3:191-205. [PMID: 20830688 DOI: 10.1002/wsbm.112] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Cardiomyocyte differentiation is a complex multistep process requiring the proper temporal and spatial integration of multiple signaling pathways. Previous embryological and genetic studies have identified a number of signaling pathways that are critical to mediate the initial formation of the mesoderm and its allocation to the cardiomyocyte lineage. It has become clear that some of these signaling networks work autonomously, in differentiating myocardial cells whereas others work non-autonomously, in neighboring tissues, to regulate cardiac differentiation indirectly. Here, we provide an overview of three signaling networks that mediate cardiomyocyte specification and review recent insights into their specific roles in heart development. In addition, we demonstrate how systems level, 'omic approaches' and other high-throughput techniques such as small molecules screens are beginning to impact our understanding of cardiomyocyte specification and, to identify novel signaling pathways involved in this process. In particular, it now seems clear that at least one chemokine receptor CXCR4 is an important marker for cardiomyocyte progenitors and may play a functional role in their differentiation. Finally, we discuss some gaps in our current understanding of early lineage selection that could be addressed by various types of omic analysis.
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Affiliation(s)
- Wenrui Liu
- Greenberg Division of Cardiology, Department of Medicine, Weill Medical College of Cornell University, New York, NY, USA
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19
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Kattman SJ, Witty AD, Gagliardi M, Dubois NC, Niapour M, Hotta A, Ellis J, Keller G. Stage-specific optimization of activin/nodal and BMP signaling promotes cardiac differentiation of mouse and human pluripotent stem cell lines. Cell Stem Cell 2011; 8:228-40. [PMID: 21295278 DOI: 10.1016/j.stem.2010.12.008] [Citation(s) in RCA: 831] [Impact Index Per Article: 63.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2009] [Revised: 10/07/2010] [Accepted: 12/10/2010] [Indexed: 02/06/2023]
Abstract
Efficient differentiation of embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs) to a variety of lineages requires step-wise approaches replicating the key commitment stages found during embryonic development. Here we show that expression of PdgfR-α segregates mouse ESC-derived Flk-1 mesoderm into Flk-1(+)PdgfR-α(+) cardiac and Flk-1(+)PdgfR-α(-) hematopoietic subpopulations. By monitoring Flk-1 and PdgfR-α expression, we found that specification of cardiac mesoderm and cardiomyocytes is determined by remarkably small changes in levels of Activin/Nodal and BMP signaling. Translation to human ESCs and iPSCs revealed that the emergence of cardiac mesoderm could also be monitored by coexpression of KDR and PDGFR-α and that this process was similarly dependent on optimal levels of Activin/Nodal and BMP signaling. Importantly, we found that individual mouse and human pluripotent stem cell lines require optimization of these signaling pathways for efficient cardiac differentiation, illustrating a principle that may well apply in other contexts.
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Affiliation(s)
- Steven J Kattman
- McEwen Center for Regenerative Medicine, University Health Network, Toronto, Ontario, Canada
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20
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Hardy KM, Yatskievych TA, Konieczka J, Bobbs AS, Antin PB. FGF signalling through RAS/MAPK and PI3K pathways regulates cell movement and gene expression in the chicken primitive streak without affecting E-cadherin expression. BMC DEVELOPMENTAL BIOLOGY 2011; 11:20. [PMID: 21418646 PMCID: PMC3071786 DOI: 10.1186/1471-213x-11-20] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Accepted: 03/21/2011] [Indexed: 12/15/2022]
Abstract
Background FGF signalling regulates numerous aspects of early embryo development. During gastrulation in amniotes, epiblast cells undergo an epithelial to mesenchymal transition (EMT) in the primitive streak to form the mesoderm and endoderm. In mice lacking FGFR1, epiblast cells in the primitive streak fail to downregulate E-cadherin and undergo EMT, and cell migration is inhibited. This study investigated how FGF signalling regulates cell movement and gene expression in the primitive streak of chicken embryos. Results We find that pharmacological inhibition of FGFR activity blocks migration of cells through the primitive streak of chicken embryos without apparent alterations in the level or intracellular localization of E-cadherin. E-cadherin protein is localized to the periphery of epiblast, primitive streak and some mesodermal cells. FGFR inhibition leads to downregulation of a large number of regulatory genes in the preingression epiblast adjacent to the primitive streak, the primitive streak and the newly formed mesoderm. This includes members of the FGF, NOTCH, EPH, PDGF, and canonical and non-canonical WNT pathways, negative modulators of these pathways, and a large number of transcriptional regulatory genes. SNAI2 expression in the primitive streak and mesoderm is not altered by FGFR inhibition, but is downregulated only in the preingression epiblast region with no significant effect on E-cadherin. Furthermore, over expression of SNAIL has no discernable effect on E-cadherin protein levels or localization in epiblast, primitive streak or mesodermal cells. FGFR activity modulates distinct downstream pathways including RAS/MAPK and PI3K/AKT. Pharmacological inhibition of MEK or AKT indicate that these downstream effectors control discrete and overlapping groups of genes during gastrulation. FGFR activity regulates components of several pathways known to be required for cell migration through the streak or in the mesoderm, including RHOA, the non-canonical WNT pathway, PDGF signalling and the cell adhesion protein N-cadherin. Conclusions In chicken embryos, FGF signalling regulates cell movement through the primitive streak by mechanisms that appear to be independent of changes in E-cadherin expression or protein localization. The positive and negative effects on large groups of genes by pharmacological inhibition of FGF signalling, including major signalling pathways and transcription factor families, indicates that the FGF pathway is a focal point of regulation during gastrulation in chicken.
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Affiliation(s)
- Katharine M Hardy
- Department of Cell Biology and Anatomy, University of Arizona, Medical Research Building, 1656 E, Mabel Street, Tucson, AZ 85724, USA
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21
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Abstract
The myocardium of the heart is composed of multiple highly specialized myocardial lineages, including those of the ventricular and atrial myocardium, and the specialized conduction system. Specification and maturation of each of these lineages during heart development is a highly ordered, ongoing process involving multiple signaling pathways and their intersection with transcriptional regulatory networks. Here, we attempt to summarize and compare much of what we know about specification and maturation of myocardial lineages from studies in several different vertebrate model systems. To date, most research has focused on early specification, and although there is still more to learn about early specification, less is known about factors that promote subsequent maturation of myocardial lineages required to build the functioning adult heart.
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Affiliation(s)
- Sylvia M Evans
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Medicine, University of California San Diego, 9500 Gilman Dr, La Jolla CA 92093, USA.
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22
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Affiliation(s)
- Michela Noseda
- From the British Heart Foundation Centre of Research Excellence (M.N., M.D.S.), National Heart and Lung Institute, Imperial College London; and the Weatherall Institute of Molecular Medicine (T.P., F.C.S., R.P.), University of Oxford, United Kingdom
| | - Tessa Peterkin
- From the British Heart Foundation Centre of Research Excellence (M.N., M.D.S.), National Heart and Lung Institute, Imperial College London; and the Weatherall Institute of Molecular Medicine (T.P., F.C.S., R.P.), University of Oxford, United Kingdom
| | - Filipa C. Simões
- From the British Heart Foundation Centre of Research Excellence (M.N., M.D.S.), National Heart and Lung Institute, Imperial College London; and the Weatherall Institute of Molecular Medicine (T.P., F.C.S., R.P.), University of Oxford, United Kingdom
| | - Roger Patient
- From the British Heart Foundation Centre of Research Excellence (M.N., M.D.S.), National Heart and Lung Institute, Imperial College London; and the Weatherall Institute of Molecular Medicine (T.P., F.C.S., R.P.), University of Oxford, United Kingdom
| | - Michael D. Schneider
- From the British Heart Foundation Centre of Research Excellence (M.N., M.D.S.), National Heart and Lung Institute, Imperial College London; and the Weatherall Institute of Molecular Medicine (T.P., F.C.S., R.P.), University of Oxford, United Kingdom
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23
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Brown K, Doss MX, Legros S, Artus J, Hadjantonakis AK, Foley AC. eXtraembryonic ENdoderm (XEN) stem cells produce factors that activate heart formation. PLoS One 2010; 5:e13446. [PMID: 20975998 PMCID: PMC2958120 DOI: 10.1371/journal.pone.0013446] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2010] [Accepted: 09/16/2010] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Initial specification of cardiomyocytes in the mouse results from interactions between the extraembryonic anterior visceral endoderm (AVE) and the nascent mesoderm. However the mechanism by which AVE activates cardiogenesis is not well understood, and the identity of specific cardiogenic factors in the endoderm remains elusive. Most mammalian studies of the cardiogenic potential of the endoderm have relied on the use of cell lines that are similar to the heart-inducing AVE. These include the embryonal-carcinoma-derived cell lines, END2 and PYS2. The recent development of protocols to isolate eXtraembryonic ENdoderm (XEN) stem cells, representing the extraembryonic endoderm lineage, from blastocyst stage mouse embryos offers new tools for the genetic dissection of cardiogenesis. METHODOLOGY/PRINCIPAL FINDINGS Here, we demonstrate that XEN cell-conditioned media (CM) enhances cardiogenesis during Embryoid Body (EB) differentiation of mouse embryonic stem (ES) cells in a manner comparable to PYS2-CM and END2-CM. Addition of CM from each of these three cell lines enhanced the percentage of EBs that formed beating areas, but ultimately, only XEN-CM and PYS2-CM increased the total number of cardiomyocytes that formed. Furthermore, our observations revealed that both contact-independent and contact-dependent factors are required to mediate the full cardiogenic potential of the endoderm. Finally, we used gene array comparison to identify factors in these cell lines that could mediate their cardiogenic potential. CONCLUSIONS/SIGNIFICANCE These studies represent the first step in the use of XEN cells as a molecular genetic tool to study cardiomyocyte differentiation. Not only are XEN cells functionally similar to the heart-inducing AVE, but also can be used for the genetic dissection of the cardiogenic potential of AVE, since they can be isolated from both wild type and mutant blastocysts. These studies further demonstrate the importance of both contact-dependent and contact-independent factors in cardiogenesis and identify potential heart-inducing proteins in the endoderm.
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Affiliation(s)
- Kemar Brown
- Greenberg Division of Cardiology, Weill Cornell Medical College, New York, New York, United States of America
| | - Michael Xavier Doss
- Greenberg Division of Cardiology, Weill Cornell Medical College, New York, New York, United States of America
| | - Stephanie Legros
- Greenberg Division of Cardiology, Weill Cornell Medical College, New York, New York, United States of America
| | - Jérôme Artus
- Developmental Biology Program, Sloan-Kettering Institute, New York, New York, United States of America
| | | | - Ann C. Foley
- Greenberg Division of Cardiology, Weill Cornell Medical College, New York, New York, United States of America
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24
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Brown K, Legros S, Artus J, Doss MX, Khanin R, Hadjantonakis AK, Foley A. A comparative analysis of extra-embryonic endoderm cell lines. PLoS One 2010; 5:e12016. [PMID: 20711519 PMCID: PMC2919048 DOI: 10.1371/journal.pone.0012016] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Accepted: 07/14/2010] [Indexed: 11/19/2022] Open
Abstract
Prior to gastrulation in the mouse, all endodermal cells arise from the primitive endoderm of the blastocyst stage embryo. Primitive endoderm and its derivatives are generally referred to as extra-embryonic endoderm (ExEn) because the majority of these cells contribute to extra-embryonic lineages encompassing the visceral endoderm (VE) and the parietal endoderm (PE). During gastrulation, the definitive endoderm (DE) forms by ingression of cells from the epiblast. The DE comprises most of the cells of the gut and its accessory organs. Despite their different origins and fates, there is a surprising amount of overlap in marker expression between the ExEn and DE, making it difficult to distinguish between these cell types by marker analysis. This is significant for two main reasons. First, because endodermal organs, such as the liver and pancreas, play important physiological roles in adult animals, much experimental effort has been directed in recent years toward the establishment of protocols for the efficient derivation of endodermal cell types in vitro. Conversely, factors secreted by the VE play pivotal roles that cannot be attributed to the DE in early axis formation, heart formation and the patterning of the anterior nervous system. Thus, efforts in both of these areas have been hampered by a lack of markers that clearly distinguish between ExEn and DE. To further understand the ExEn we have undertaken a comparative analysis of three ExEn-like cell lines (END2, PYS2 and XEN). PYS2 cells are derived from embryonal carcinomas (EC) of 129 strain mice and have been characterized as parietal endoderm-like [1], END2 cells are derived from P19 ECs and described as visceral endoderm-like, while XEN cells are derived from blastocyst stage embryos and are described as primitive endoderm-like. Our analysis suggests that none of these cell lines represent a bona fide single in vivo lineage. Both PYS2 and XEN cells represent mixed populations expressing markers for several ExEn lineages. Conversely END2 cells, which were previously characterized as VE-like, fail to express many markers that are widely expressed in the VE, but instead express markers for only a subset of the VE, the anterior visceral endoderm. In addition END2 cells also express markers for the PE. We extended these observations with microarray analysis which was used to probe and refine previously published data sets of genes proposed to distinguish between DE and VE. Finally, genome-wide pathway analysis revealed that SMAD-independent TGFbeta signaling through a TAK1/p38/JNK or TAK1/NLK pathway may represent one mode of intracellular signaling shared by all three of these lines, and suggests that factors downstream of these pathways may mediate some functions of the ExEn. These studies represent the first step in the development of XEN cells as a powerful molecular genetic tool to study the endodermal signals that mediate the important developmental functions of the extra-embryonic endoderm. Our data refine our current knowledge of markers that distinguish various subtypes of endoderm. In addition, pathway analysis suggests that the ExEn may mediate some of its functions through a non-classical MAP Kinase signaling pathway downstream of TAK1.
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Affiliation(s)
- Kemar Brown
- Greenberg Division of Cardiology, Weill Cornell Medical College, New
York, New York, United States of America
| | - Stephanie Legros
- Greenberg Division of Cardiology, Weill Cornell Medical College, New
York, New York, United States of America
| | - Jérôme Artus
- Developmental Biology Program, Sloan-Kettering Institute, New York, New
York, United States of America
| | - Michael Xavier Doss
- Greenberg Division of Cardiology, Weill Cornell Medical College, New
York, New York, United States of America
| | - Raya Khanin
- Computational Biology Program, Sloan-Kettering Institute, New York, New
York, United States of America
| | | | - Ann Foley
- Greenberg Division of Cardiology, Weill Cornell Medical College, New
York, New York, United States of America
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25
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Nakajima Y. Second lineage of heart forming region provides new understanding of conotruncal heart defects. Congenit Anom (Kyoto) 2010; 50:8-14. [PMID: 20050864 DOI: 10.1111/j.1741-4520.2009.00267.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Abnormal heart development causes various congenital heart defects. Recent cardiovascular biology studies have elucidated the morphological mechanisms involved in normal and abnormal heart development. The primitive heart tube originates from the lateral-most part of the heart forming mesoderm and mainly gives rise to the left ventricle. Then, during the cardiac looping, the outflow tract is elongated by the addition of cardiogenic cells from the both pharyngeal and splanchnic mesoderm (corresponding to anterior and secondary heart field, respectively), which originate from the mediocaudal region of the heart forming mesoderm and are later located anteriorly (rostrally) to the dorsal region of the heart tube. Therefore, the heart progenitors that contribute to the outflow tract region are distinct from those that form the left ventricle. The knowledge that there are two different lineages of heart progenitors in the four-chambered heart provides new understanding of the morphological and molecular etiology of conotruncal heart defects.
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Affiliation(s)
- Yuji Nakajima
- Department of Anatomy and Cell Biology, Osaka City University, Japan.
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26
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Samuel LJ, Latinkić BV. Early activation of FGF and nodal pathways mediates cardiac specification independently of Wnt/beta-catenin signaling. PLoS One 2009; 4:e7650. [PMID: 19862329 PMCID: PMC2763344 DOI: 10.1371/journal.pone.0007650] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Accepted: 10/07/2009] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Cardiac induction, the first step in heart development in vertebrate embryos, is thought to be initiated by anterior endoderm during gastrulation, but what the signals are and how they act is unknown. Several signaling pathways, including FGF, Nodal, BMP and Wnt have been implicated in cardiac specification, in both gain- and loss-of-function experiments. However, as these pathways regulate germ layer formation and patterning, their specific roles in cardiac induction have been difficult to define. METHODOLOGY/PRINCIPAL FINDINGS To investigate the mechanisms of cardiac induction directly we devised an assay based on conjugates of anterior endoderm from early gastrula stage Xenopus embryos as the inducing tissue and pluripotent ectodermal explants as the responding tissue. We show that the anterior endoderm produces a specific signal, as skeletal muscle is not induced. Cardiac inducing signal needs up to two hours of interaction with the responding tissue to produce an effect. While we found that the BMP pathway was not necessary, our results demonstrate that the FGF and Nodal pathways are essential for cardiogenesis. They were required only during the first hour of cardiogenesis, while sustained activation of ERK was required for at least four hours. Our results also show that transient early activation of the Wnt/beta-catenin pathway has no effect on cardiogenesis, while later activation of the pathway antagonizes cardiac differentiation. CONCLUSIONS/SIGNIFICANCE We have described an assay for investigating the mechanisms of cardiac induction by anterior endoderm. The assay was used to provide evidence for a direct, early and transient requirement of FGF and Nodal pathways. In addition, we demonstrate that Wnt/beta-catenin pathway plays no direct role in vertebrate cardiac specification, but needs to be suppressed just prior to differentiation.
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Affiliation(s)
- Lee J. Samuel
- School of Biosciences, Cardiff University, Cardiff, United Kingdom
| | - Branko V. Latinkić
- School of Biosciences, Cardiff University, Cardiff, United Kingdom
- * E-mail:
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27
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Nakajima Y, Sakabe M, Matsui H, Sakata H, Yanagawa N, Yamagishi T. Heart development before beating. Anat Sci Int 2009; 84:67-76. [DOI: 10.1007/s12565-009-0025-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2008] [Accepted: 07/21/2008] [Indexed: 12/21/2022]
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28
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Abstract
The muscle lost after a myocardial infarction is replaced with noncontractile scar tissue, often initiating heart failure. Whole-organ cardiac transplantation is the only currently available clinical means of replacing the lost muscle, but this option is limited by the inadequate supply of donor hearts. Thus, cell-based cardiac repair has attracted considerable interest as an alternative means of ameliorating cardiac injury. Because of their tremendous capacity for expansion and unquestioned cardiac potential, pluripotent human embryonic stem cells (hESCs) represent an attractive candidate cell source for obtaining cardiomyocytes and other useful mesenchymal cell types for such therapies. Human embryonic stem cell-derived cardiomyocytes exhibit a committed cardiac phenotype and robust proliferative capacity, and recent testing in rodent infarct models indicates that they can partially remuscularize injured hearts and improve contractile function. Although the latter successes give good reason for optimism, considerable challenges remain in the successful application of hESCs to cardiac repair, including the need for preparations of high cardiac purity, improved methods of delivery, and approaches to overcome immune rejection and other causes of graft cell death. This review will describe the phenotype of hESC-derived cardiomyocytes and preclinical experience with these cells and will consider strategies to overcoming the aforementioned challenges.
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Affiliation(s)
- Wei-Zhong Zhu
- Department of Pathology, University of Washington, Seattle, WA 98109
| | - Kip Hauch
- Department of Bioengineering, University of Washington, Seattle, WA 98109
| | - Chunhui Xu
- Geron Corporation, 230 Constitution Drive, Menlo Park, CA 94025
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29
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Endothelial cell lineages of the heart. Cell Tissue Res 2008; 335:67-73. [PMID: 18682987 DOI: 10.1007/s00441-008-0663-z] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2008] [Accepted: 06/10/2008] [Indexed: 02/07/2023]
Abstract
During early gastrulation, vertebrate embryos begin to produce endothelial cells (ECs) from the mesoderm. ECs first form primitive vascular plexus de novo and later differentiate into arterial, venous, capillary, and lymphatic ECs. In the heart, the five distinct EC types (endocardial, coronary arterial, venous, capillary, and lymphatic) have distinct phenotypes. For example, coronary ECs establish a typical vessel network throughout the myocardium, whereas endocardial ECs form a large epithelial sheet with no angiogenic sprouting into the myocardium. Neither coronary arteries, veins, and capillaries, nor lymphatic vessels fuse with the endocardium or open to the heart chamber. The developmental stage during which the specific phenotype of each cardiac EC type is determined remains unclear. The mechanisms involved in EC commitment and diversity can however be more precisely defined by tracking the migratory patterns and lineage decisions of the precursors of cardiac ECs.
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Matsui H, Sakabe M, Sakata H, Yanagawa N, Ikeda K, Yamagishi T, Nakajima Y. Induction of initial heart α-actin, smooth muscle α-actin, in chick pregastrula epiblast: The role of hypoblast and fibroblast growth factor-8. Dev Growth Differ 2008; 50:143-57. [DOI: 10.1111/j.1440-169x.2008.00987.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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31
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Takehara-Kasamatsu Y, Tsuchida K, Nakatani M, Murakami T, Kurisaki A, Hashimoto O, Ohuchi H, Kurose H, Mori K, Kagami S, Noji S, Sugino H. Characterization of follistatin-related gene as a negative regulatory factor for activin family members during mouse heart development. THE JOURNAL OF MEDICAL INVESTIGATION 2007; 54:276-88. [PMID: 17878677 DOI: 10.2152/jmi.54.276] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Follistatin-related gene (FLRG) encodes a secretory glycoprotein that has characteristic cysteine-rich follistatin domains. FLRG protein binds to and neutralizes several transforming growth factor-beta (TGF-beta) superfamily members, including myostatin (MSTN), which is a potent negative regulator of skeletal muscle mass. We have previously reported that FLRG was abundantly expressed in fetal and adult mouse heart. In this study, we analyzed the expression of FLRG mRNA during mouse heart development. FLRG mRNA was continuously expressed in the embryonic heart, whereas it was very low in skeletal muscles. By contrast, MSTN mRNA was highly expressed in embryonic skeletal muscles, whereas the expression of MSTN mRNA was rather low in the heart. In situ hybridization and immunohistochemical analysis revealed that FLRG expressed in smooth muscle of the aorta and pulmonary artery, valve leaflets of mitral and tricuspid valves, and cardiac muscles in the ventricle of mouse embryonic heart. However, MSTN was expressed in very limited areas, such as valve leaflets of pulmonary and aortic valves, the top of the ventricular and atrial septa. Interestingly, the expression of MSTN was complementary to that of FLRG, especially in the valvular apparatus. Biochemical analyses with surface plasmon resonance biosensor and reporter assays demonstrated that FLRG hardly dissociates from MSTN and activin once it bound to them, and efficiently inhibits these activities. Our results suggest that FLRG could function as a negative regulator of activin family members including MSTN during heart development.
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Gerhart J, Neely C, Elder J, Pfautz J, Perlman J, Narciso L, Linask KK, Knudsen K, George-Weinstein M. Cells that express MyoD mRNA in the epiblast are stably committed to the skeletal muscle lineage. ACTA ACUST UNITED AC 2007; 178:649-60. [PMID: 17698608 PMCID: PMC2064471 DOI: 10.1083/jcb.200703060] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The epiblast of the chick embryo contains cells that express MyoD mRNA but not MyoD protein. We investigated whether MyoD-positive (MyoDpos) epiblast cells are stably committed to the skeletal muscle lineage or whether their fate can be altered in different environments. A small number of MyoDpos epiblast cells were tracked into the heart and nervous system. In these locations, they expressed MyoD mRNA and some synthesized MyoD protein. No MyoDpos epiblast cells differentiated into cardiac muscle or neurons. Similar results were obtained when MyoDpos cells were isolated from the epiblast and microinjected into the precardiac mesoderm or neural plate. In contrast, epiblast cells lacking MyoD differentiated according to their environment. These results demonstrate that the epiblast contains both multipotent cells and a subpopulation of cells that are stably committed to the skeletal muscle lineage before the onset of gastrulation. Stable programming in the epiblast may ensure that MyoDpos cells express similar signaling molecules in a variety of environments.
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Affiliation(s)
- Jacquelyn Gerhart
- Center for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, Philadelphia, PA 19131, USA
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33
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Abstract
We have characterized two signaling pathways that induce heart tissue during embryonic development. The first is initiated by the Wnt antagonist Dickkopf1 (Dkk1) and involves the homeodomain transcription factor Hex. Other Wnt antagonists are less effective and the potency of Dkk1 might be due to synergy between Wnt antagonizing and another, novel activity emanating from its amino terminal cysteine-rich domain. The second signal is initiated by Nodal and its co-receptor Cripto. Importantly, both the Dkk1/Wnt antagonism and Nodal pathways act on the endoderm that underlies the future heart to control secretion of diffusible factors that induce cardiogenesis in adjacent mesoderm. In this article, we summarize data that Dkk1 induces cardiogenic differentiation cell non-autonomously through the action of the homeodomain transcription factor Hex. We also discuss recent data showing that Nodal also acts indirectly through stimulation of the secreted protein Cerberus, which is a member of the differential-screening selected aberrant in neuroblastoma (DAN) family of secreted proteins. Finally, we present the model that signaling from Dkk1 regulates novel activities, in addition to Wnt antagonism, which are essential for progression beyond initiation of cardiogenesis to control later stages of cardiomyocyte differentiation and myocardial tissue organization.
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Affiliation(s)
- Ann C Foley
- The Burnham Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA
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Sakata H, Sakabe M, Matsui H, Kawada N, Nakatani K, Ikeda K, Yamagishi T, Nakajima Y. Rho kinase inhibitor Y27632 affects initial heart myofibrillogenesis in cultured chick blastoderm. Dev Dyn 2007; 236:461-72. [PMID: 17195179 DOI: 10.1002/dvdy.21055] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
During early vertebrate development, Rho-associated kinases (ROCKs) are involved in various developmental processes. Here, we investigated spatiotemporal expression patterns of ROCK1 protein and examined the role of ROCK during initial heart myofibrillogenesis in cultured chick blastoderm. Immunohistochemistry showed that ROCK1 protein was distributed in migrating mesendoderm cells, visceral mesoderm of the pericardial coelom (from which cardiomyocytes will later develop), and cardiomyocytes of the primitive heart tube. Pharmacological inhibition of ROCK by Y27632 did not alter the myocardial specification process in cultured posterior blastoderm. However, Y27632 disturbed the formation of striated heart myofibrils in cultured posterior blastoderm. Furthermore, Y27632 affected the formation of costamere, a vinculin/integrin-based rib-like cell adhesion site. In such cardiomyocytes, cell-cell adhesion was disrupted and N-cadherin was distributed in the perinuclear region. Pharmacological inactivation of myosin light chain kinase, a downstream of ROCK, by ML-9 perturbed the formation of striated myofibrils as well as costameres, but not cell-cell adhesion. These results suggest that ROCK plays a role in the formation of initial heart myofibrillogenesis by means of actin-myosin assembly, and focal adhesion/costamere and cell-cell adhesion.
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Affiliation(s)
- Hirokazu Sakata
- Department of Anatomy and Cell Biology, Graduate School of Medicine, Osaka City University, Asahimachi, Osaka, Japan
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35
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Dunwoodie SL. Combinatorial signaling in the heart orchestrates cardiac induction, lineage specification and chamber formation. Semin Cell Dev Biol 2007; 18:54-66. [PMID: 17236794 DOI: 10.1016/j.semcdb.2006.12.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The complexity of mammalian cardiogenesis is compounded, as the heart must function in the embryo whilst it is still being formed. Great advances have been made recently as additional cardiac progenitor cell populations have been identified. The induction and maintenance of these progenitors, and their deployment to the developing heart relies on combinatorial molecular signalling, a feature also of cardiac chamber formation. Many forms of congenital heart disease in humans are likely to arise from defects in the early stages of heart development; therefore it is important to understand the molecular pathways that underlie some of the key events that shape the heart during the early stages of it development.
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Affiliation(s)
- Sally L Dunwoodie
- Developmental Biology Program, Victor Chang Cardiac Research Institute, 384 Victoria Street, Darlinghurst, NSW, Australia.
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36
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Guzzo RM, Foley AC, Ibarra YM, Mercola M. Signaling Pathways in Embryonic Heart Induction. CARDIOVASCULAR DEVELOPMENT 2007. [DOI: 10.1016/s1574-3349(07)18005-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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37
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Smith TK, Bader DM. Signals from both sides: Control of cardiac development by the endocardium and epicardium. Semin Cell Dev Biol 2006; 18:84-9. [PMID: 17267246 PMCID: PMC2849752 DOI: 10.1016/j.semcdb.2006.12.013] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
It is readily apparent that the process of heart development is an intricate one, in which cells derived from many embryonic sources coalesce and coordinate their behaviors and development, resulting in the mature heart. The behaviors and mechanisms of this process are complex, and still incompletely understood. However, it is readily apparent that communication between diverse cell types must be involved in this process. The signaling that emanates from epicardial and endocardial sources is the focus of this review.
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Affiliation(s)
- Travis K Smith
- The Stahlman Cardiovascular Research Laboratories, Program for Developmental Biology, Department of Medicine, Vanderbilt University Medical Center, 2200 Pierce Ave, 348 Preston Research Building, Nashville, TN 37232-6300, USA
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38
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Matsui H, Sakabe M, Sakata H, Nakatani K, Ikeda K, Fukui M, Ando K, Yamagishi T, Nakajima Y. Heart myofibrillogenesis occurs in isolated chick posterior blastoderm: a culture model. Acta Histochem Cytochem 2006; 39:139-44. [PMID: 17327900 PMCID: PMC1698866 DOI: 10.1267/ahc.06009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Accepted: 09/21/2006] [Indexed: 12/01/2022] Open
Abstract
Early cardiogenesis including myofibrillogenesis is a critical event during development. Recently we showed that prospective cardiomyocytes reside in the posterior lateral blastoderm in the chick embryo. Here we cultured the posterior region of the chick blastoderm in serum-free medium and observed the process of myofibrillogenesis by immunohistochemistry. After 48 hours, explants expressed sarcomeric proteins (sarcomeric α-actinin, 61%; smooth muscle α-actin, 95%; Z-line titin, 56%; sarcomeric myosin, 48%); however, they did not yet show a mature striation. After 72 hours, more than 92% of explants expressed I-Z-I proteins, which were incorporated into the striation in 75% of explants or more (sarcomeric α-actinin, 75%; smooth muscle α-actin, 81%; Z-line titin, 83%). Sarcomeric myosin was expressed in 63% of explants and incorporated into A-bands in 37%. The percentage incidence of expression or striation of I-Z-I proteins was significantly higher than that of sarcomeric myosin. Results suggested that the nascent I-Z-I components appeared to be generated independently of A-bands in the cultured posterior blastoderm, and that the process of myofibrillogenesis observed in our culture model faithfully reflected that in vivo. Our blastoderm culture model appeared to be useful to investigate the mechanisms regulating the early cardiogenesis.
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Affiliation(s)
| | | | | | | | | | - Mitsuru Fukui
- Laboratory of Statistics, Graduate School of Medicine, Osaka City University, 1-4-3 Asahimachi, Abenoku, Osaka 545-8585, Japan
| | - Katsumi Ando
- Department of Anatomy, School of Medicine, Saitama Medical University, 38 Morohongo, Moroyama-cho, Irumagun, Saitama 350-0495, Japan
| | - Toshiyuki Yamagishi
- Department of Anatomy, School of Medicine, Saitama Medical University, 38 Morohongo, Moroyama-cho, Irumagun, Saitama 350-0495, Japan
| | - Yuji Nakajima
- Department of Anatomy and Cell Biology
- Correspondence to: Yuji Nakajima M.D., Department of Anatomy and Cell Biology, Graduate School of Medicine, Osaka City University, 1–4–3 Asahimachi, Abenoku, Osaka 545–8585, Japan. E-mail:
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39
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Foley AC, Korol O, Timmer AM, Mercola M. Multiple functions of Cerberus cooperate to induce heart downstream of Nodal. Dev Biol 2006; 303:57-65. [PMID: 17123501 PMCID: PMC1855199 DOI: 10.1016/j.ydbio.2006.10.033] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Revised: 10/05/2006] [Accepted: 10/22/2006] [Indexed: 11/25/2022]
Abstract
The TGFbeta family member Nodal has been implicated in heart induction through misexpression of a dominant negative version of the type I Nodal receptor (Alk4) and targeted deletion of the co-receptor Cripto in murine ESCs and mouse embryos; however, whether Nodal acts directly or indirectly to induce heart tissue or interacts with other signaling molecules or pathways remained unclear. Here we present Xenopus embryological studies demonstrating an unforeseen role for the DAN family protein Cerberus within presumptive foregut endoderm as essential for differentiation of cardiac mesoderm in response to Nodal. Ectopic activation of Nodal signaling in non-cardiogenic ventroposterior mesendoderm, either by misexpression of the Nodal homologue XNr1 together with Cripto or by a constitutively active Alk4 (caAlk4), induced both cardiac markers and Cerberus. Mosaic lineage tracing studies revealed that Nodal/Cripto and caAlk4 induced cardiac markers cell non-autonomously, thus supporting the idea that Cerberus or another diffusible factor is an essential mediator of Nodal-induced cardiogenesis. Cerberus alone was found sufficient to initiate cardiogenesis at a distance from its site of synthesis. Conversely, morpholino-mediated specific knockdown of Cerberus reduced both endogenous cardiomyogenesis and ectopic heart induction resulting from misactivation of Nodal/Cripto signaling. Since the specific knockdown of Cerberus did not abrogate heart induction by the Wnt antagonist Dkk1, Nodal/Cripto and Wnt antagonists appear to initiate cardiogenesis through distinct pathways. This idea was further supported by the combinatorial effect of morpholino-medicated knockdown of Cerberus and Hex, which is required for Dkk1-induced cardiogenesis, and the differential roles of essential downstream effectors: Nodal pathway activation did not induce the transcriptional repressor Hex while Dkk-1 did not induce Cerberus. These studies demonstrated that cardiogenesis in mesoderm depends on Nodal-mediated induction of Cerberus in underlying endoderm, and that this pathway functions in a pathway parallel to cardiogenesis initiated through the induction of Hex by Wnt antagonists. Both pathways operate in endoderm to initiate cardiogenesis in overlying mesoderm.
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Affiliation(s)
| | | | | | - Mark Mercola
- *author for correspondence, E-mail: , Telephone: (858) 795-5242, Fax: (858) 713 6274
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40
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Männer J. Extracardiac tissues and the epigenetic control of myocardial development in vertebrate embryos. Ann Anat 2006; 188:199-212. [PMID: 16711159 DOI: 10.1016/j.aanat.2006.01.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
During the past few years, research on the developing cardiovascular system has given new insights into the origin and development of the myocardium in vertebrate embryos. In the present paper, a review is given on our current knowledge about two aspects of myocardial development that have been found to depend on signals from extracardiac tissues. These two aspects are, firstly, the development of the so-called heart-forming fields and, secondly, the morphogenesis of the outer compact layer of the myocardial wall.
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Affiliation(s)
- Jörg Männer
- Abteilung Anatomie und Embryologie, Georg-August-Universität zu Göttingen, Kreuzbergring 36, 37075 Göttingen, Germany.
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41
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Schlueter J, Männer J, Brand T. BMP is an important regulator of proepicardial identity in the chick embryo. Dev Biol 2006; 295:546-58. [PMID: 16677627 DOI: 10.1016/j.ydbio.2006.03.036] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2005] [Revised: 03/16/2006] [Accepted: 03/28/2006] [Indexed: 10/24/2022]
Abstract
The proepicardium (PE) is a transient structure formed by pericardial coelomic mesothelium at the venous pole of the embryonic heart and gives rise to several cell types of the mature heart. In order to study PE development in chick embryos, we have analyzed the expression pattern of the marker genes Tbx18, Wt1, and Cfc. During PE induction, the three marker genes displayed a left-right asymmetric expression pattern. In each case, expression on the right side was stronger than on the left side. The left-right asymmetric gene expression observed here is in accord with the asymmetric formation of the proepicardium in the chick embryo. While initially the marker genes were expressed in the primitive sinus horn, subsequently, expression became confined to the PE mesothelium. In order to search for signaling factors involved in PE development, we studied Bmp2 and Bmp4 expression. Bmp2 was bilaterally expressed in the sinus venosus. In contrast, Bmp4 expression was initially expressed unilaterally in the right sinus horn and subsequently in the PE. In order to assess its functional role, BMP signaling was experimentally modulated by supplying exogenous BMP2 and by inhibiting endogenous BMP signaling through the addition of Noggin. Both supplying BMP and blocking BMP signaling resulted in a loss of PE marker gene expression. Surprisingly, both experimental situations lead to cardiac myocyte formation in the PE cultures. Careful titration experiments with exogenously added BMP2 or Noggin revealed that PE-specific marker gene expression depends on a low level of BMP signaling. Implantation of BMP2-secreting cells or beads filled with Noggin protein into the right sinus horn of HH stage 11 embryos resulted in downregulation of Tbx18 expression, corresponding to the results of the explant assay. Thus, a distinct level of BMP signaling is required for PE formation in the chick embryo.
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Affiliation(s)
- Jan Schlueter
- Cell and Developmental Biology, Theodor-Boveri-Institute, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
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42
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Sakabe M, Matsui H, Sakata H, Ando K, Yamagishi T, Nakajima Y. Understanding heart development and congenital heart defects through developmental biology: a segmental approach. Congenit Anom (Kyoto) 2005; 45:107-18. [PMID: 16359490 DOI: 10.1111/j.1741-4520.2005.00079.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
ABSTRACT The heart is the first organ to form and function during development. In the pregastrula chick embryo, cells contributing to the heart are found in the postero-lateral epiblast. During the pregastrula stages, interaction between the posterior epiblast and hypoblast is required for the anterior lateral plate mesoderm (ALM) to form, from which the heart will later develop. This tissue interaction is replaced by an Activin-like signal in culture. During gastrulation, the ALM is committed to the heart lineage by endoderm-secreted BMP and subsequently differentiates into cardiomyocyte. The right and left precardiac mesoderms migrate toward the ventral midline to form the beating primitive heart tube. Then, the heart tube generates a right-side bend, and the d-loop and presumptive heart segments begin to appear segmentally: outflow tract (OT), right ventricle, left ventricle, atrioventricular (AV) canal, atrium and sinus venosus. T-box transcription factors are involved in the formation of the heart segments: Tbx5 identifies the left ventricle and Tbx20 the right ventricle. After the formation of the heart segments, endothelial cells in the OT and AV regions transform into mesenchyme and generate valvuloseptal endocardial cushion tissue. This phenomenon is called endocardial EMT (epithelial-mesenchymal transformation) and is regulated mainly by BMP and TGFbeta. Finally, heart septa that have developed in the OT, ventricle, AV canal and atrium come into alignment and fuse, resulting in the completion of the four-chambered heart. Altered development seen in the cardiogenetic process is involved in the pathogenesis of congenital heart defects. Therefore, understanding the molecular nature regulating the 'nodal point' during heart development is important in order to understand the etiology of congenital heart defects, as well as normal heart development.
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Affiliation(s)
- Masahide Sakabe
- Department of Anatomy, Graduate School of Medicine, Osaka City University, Abenoku, Osaka, Japan
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43
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Ramsdell AF. Left–right asymmetry and congenital cardiac defects: Getting to the heart of the matter in vertebrate left–right axis determination. Dev Biol 2005; 288:1-20. [PMID: 16289136 DOI: 10.1016/j.ydbio.2005.07.038] [Citation(s) in RCA: 135] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2005] [Revised: 07/21/2005] [Accepted: 07/26/2005] [Indexed: 01/20/2023]
Abstract
Cellular and molecular left-right differences that are present in the mesodermal heart fields suggest that the heart is lateralized from its inception. Left-right asymmetry persists as the heart fields coalesce to form the primary heart tube, and overt, morphological asymmetry first becomes evident when the heart tube undergoes looping morphogenesis. Thereafter, chamber formation, differentiation of the inflow and outflow tracts, and position of the heart relative to the midline are additional features of heart development that exhibit left-right differences. Observations made in human clinical studies and in animal models of laterality disease suggest that all of these features of cardiac development are influenced by the embryonic left-right body axis. When errors in left-right axis determination happen, they almost always are associated with complex congenital heart malformations. The purpose of this review is to highlight what is presently known about cardiac development and upstream processes of left-right axis determination, and to consider how perturbation of the left-right body plan might ultimately result in particular types of congenital heart defects.
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Affiliation(s)
- Ann F Ramsdell
- Department of Cell and Developmental Biology and Anatomy, School of Medicine and Program in Women's Studies, College of Arts and Sciences, University of South Carolina, Columbia, SC 29208, USA.
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44
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Strony R, Gerhart J, Tornambe D, Perlman J, Neely C, Dare J, Stewart B, George-Weinstein M. NeuroM and MyoD are expressed in separate subpopulations of cells in the pregastrulating epiblast. Gene Expr Patterns 2005; 5:387-95. [PMID: 15661645 DOI: 10.1016/j.modgep.2004.09.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2004] [Revised: 09/14/2004] [Accepted: 09/14/2004] [Indexed: 12/20/2022]
Abstract
Epiblast cells form skeletal muscle and neurons in culture and some express mRNA for the skeletal muscle specific transcription factor MyoD in vivo. The following experiments were designed to determine whether the neurogenic transcription factor NeuroM is expressed in the epiblast and if NeuroM and MyoD are present in separate subpopulations of epiblast cells that can differentiate into neurons and muscle, respectively. In situ hybridization revealed that NeuroM was present in the anterior region of the pregastrulating epiblast. Some cells with NeuroM were proliferating and expressed two molecules present in neurogenic cells, NCAM and the Zn-12/HNK-1 carbohydrate. The G8 antibody labeled cells with MyoD but not NeuroM. When G8 positive cells were isolated by magnetic cell sorting and placed in culture, nearly all differentiated into skeletal muscle in serum free medium. A subpopulation of cells isolated with antibodies that bound to cells expressing NeuroM formed neurons when cultured in medium supplemented with sera and embryo extract. These experiments demonstrate that NeuroM and MyoD are present in separate subpopulations of cells in the pregastrulating epiblast. Epiblast cells with NeuroM are more dependent on exogenous factors to differentiate than those with MyoD.
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Affiliation(s)
- Robert Strony
- Department of Anatomy, Philadelphia College of Osteopathic Medicine, 4170 City Avenue, Philadelphia, PA 19131, USA
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45
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Lauss M, Stary M, Tischler J, Egger G, Puz S, Bader-Allmer A, Seiser C, Weitzer G. Single inner cell masses yield embryonic stem cell lines differing in lifr expression and their developmental potential. Biochem Biophys Res Commun 2005; 331:1577-86. [PMID: 15883053 DOI: 10.1016/j.bbrc.2005.04.068] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2005] [Indexed: 12/27/2022]
Abstract
The unique differentiation potential of inner cell mass derived embryonic stem cells together with their outstanding self-renewal capacity makes them a desirable source for somatic cell therapy of human diseases. Somatic cells are gained by in vitro differentiation of embryonic stem cells, however, the differentiation potential of embryonic stem cells varied even between isogenic cell lines. Variable differentiation potentials may either be a consequence of an inherent inhomogeneity of gene expression in the inner cell mass or may have technical reasons. To understand variations in the differentiation potential, we generated pairs of isogenic, monozygotic twin, and single inner cell mass derived clonal embryonic stem cell lines, and demonstrate that they differentially express the leukaemia inhibitory factor receptor gene. Variations of leukaemia inhibitory factor receptor protein levels are already evident in the inner cell mass and predispose the cardiomyogenic potential of embryonic stem cell lines in a Janus activated kinase dependent manner. Thus, a single inner cell mass may give rise to embryonic stem cell lines with different developmental potentials.
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Affiliation(s)
- Martin Lauss
- Max F. Perutz Laboratories, University Institutes at the Vienna Biocenter, Department of Medical Biochemistry, Division of Molecular Cell Biology, Medical University of Vienna, Dr. Bohrgasse 9, A1030 Vienna, Austria
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46
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Foley AC, Mercola M. Heart induction by Wnt antagonists depends on the homeodomain transcription factor Hex. Genes Dev 2005; 19:387-96. [PMID: 15687261 PMCID: PMC546516 DOI: 10.1101/gad.1279405] [Citation(s) in RCA: 167] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Inhibition of canonical Wnt/beta-catenin signaling by Dickkopf-1 (Dkk-1) or Crescent initiates cardiogenesis in vertebrate embryos. However, nearly nothing is known about the downstream effectors of these secreted Wnt antagonists or the mechanism by which they activate heart formation. Here we show that Wnt antagonists in Xenopus stimulate cardiogenesis non-cell-autonomously, up to several cells away from those in which canonical Wnt/beta-catenin signaling is blocked, indicative of an indirect role in heart induction. A screen for downstream mediators revealed that Dkk-1 and other inhibitors of the canonical Wnt pathway induce the homeodomain transcription factor Hex, which is normally expressed in endoderm underlying the presumptive cardiac mesoderm in amphibian, bird, and mammalian embryos. Loss of Hex function blocks both endogenous heart development and ectopic heart induction by Dkk-1. As with the canonical Wnt pathway antagonists, ectopic Hex induces expression of cardiac markers non-cell-autonomously. Thus, to initiate cardiogenesis, Wnt antagonists act on endoderm to up-regulate Hex, which, in turn, controls production of a diffusible heart-inducing factor. This novel function for Hex suggests an etiology for the cardiac malformations in Hex mutant mice and will make possible the isolation of factors that induce heart directly in the mesoderm.
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Affiliation(s)
- Ann C Foley
- Stem Cell and Regeneration Program, Burnham Institute, La Jolla, California 92037, USA
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47
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Callebaut M. Origin, fate, and function of the components of the avian germ disc region and early blastoderm: Role of ooplasmic determinants. Dev Dyn 2005; 233:1194-216. [PMID: 15986474 DOI: 10.1002/dvdy.20493] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
In the avian oocytal germ disc region, at the end of oogenesis, we discerned four ooplasms (alpha, beta, gamma, delta) presenting an onion-peel distribution (from peripheral and superficial to central and deep. Their fate was followed during early embryonic development. The most superficial and peripheral alpha ooplasm plays a fundamental role during cleavage. The beta ooplasm, originally localized in the peripheral region of the blastodisc, becomes mainly concentrated in the primitive streak. At the moment of bilateral symmetrization, a spatially oblique, sickle-shaped uptake of gamma and delta ooplasms occurs so that gamma and delta ooplasms become incorporated into the deeper part of the avian blastoderm. These ooplasms seem to contain ooplasmic determinants that initiate either early neurulation or gastrulation events. The early neural plate-inducing structure that forms a deep part of the blastoderm is the delta ooplasm-containing endophyll (primary hypoblast). Together with the primordial germ cells, it is derived from the superficial centrocaudal part of the nucleus of Pander, which also contains delta ooplasm. The other structure (gamma ooplasm) that is incorporated into the caudolateral deep part of the blastoderm forms Rauber's sickle. It induces gastrulation in the concavity of Rauber's sickle and blood island formation exterior to Rauber's sickle. Rauber's sickle develops by ingrowth of blastodermal cells into the gamma ooplasm, which surrounds the nucleus of Pander. Rauber's sickle constitutes the primary major organizer of the avian blastoderm and generates only extraembryonic tissues (junctional and sickle endoblast). By imparting positional information, it organizes and dominates the whole blastoderm (controlling gastrulation, neurulation, and coelom and cardiovascular system formation). Fragments of the horns of Rauber's sickle extend far cranially into the lateral quadrants of the unincubated blastoderm, so that often Rauber's sickle material forms three quarters of a circle. This finding explains the regulative capacities of isolated blastoderm parts, with the exception of the anti-sickle region and central blastoderm region, where no Rauber's sickle material is present. In avian blastoderms, there exists a competitive inhibition by Rauber's sickle on the primitive streak and neural plate-inducing effects of sickle endoblast. Avian primordial germ cells contain delta ooplasm derived from the superficial part of the nucleus of Pander. Their original deep and central ooplasmic localization has been confirmed by the use of a chicken vasa homologue. We conclude that the unincubated blastoderm consists of three elementary tissues: upper layer mainly containing beta ooplasm, endophyll containing delta ooplasm, and Rauber's sickle containing gamma ooplasm). These elementary tissues form before the three classic germ layers have developed.
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Affiliation(s)
- Marc Callebaut
- University of Antwerp, Laboratory of Human Anatomy and Embryology, Groenenborgerlaan 171, BE-2020 Antwerpen, Belgium.
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Matsui H, Ikeda K, Nakatani K, Sakabe M, Yamagishi T, Nakanishi T, Nakajima Y. Induction of initial cardiomyocyte α-actin—smooth muscle α-actin—in cultured avian pregastrula epiblast: A role for nodal and BMP antagonist. Dev Dyn 2005; 233:1419-29. [PMID: 15977172 DOI: 10.1002/dvdy.20477] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
During early cardiogenesis, endoderm-derived bone morphogenetic protein (BMP) induces the expression of both heart-specific transcription factors and sarcomeric proteins. However, BMP antagonists do not inhibit the expression of the "initial heart alpha-actin"--smooth muscle alpha-actin (SMA)--which is first expressed in the anterior lateral mesoderm and then recruited into the initial myofibrils (Nakajima et al. [2002] Dev. Biol. 245:291-303). Therefore, mechanisms that regulate the expression of SMA in the heart-forming mesoderm are not well-understood. Regional explantation experiments using chick blastoderm showed that the posterolateral region of the epiblast differentiated into cardiomyocytes. Posterior epiblast cultured with or without the associated hypoblast showed that interaction between the tissues of these two germ layers at the early pregastrula stage (stages X-XI) was a prerequisite for the expression of SMA. Posterior epiblast that is cultured without hypoblast could also be induced to express SMA if TGF-beta or activin was added to the culture medium. However, neither neutralizing antibodies against TGF-betas nor follistatin perturbed the expression of SMA in cultured blastoderm. Adding BMP to the cultured blastoderm inhibited the expression of SMA, whereas BMP antagonists, such as chordin, were able to induce the expression of SMA in cultured posterior epiblast. Furthermore, adding lefty-1, a nodal antagonist, to the blastoderm inhibited the expression of SMA, and nodal plus BMP antagonist up-regulated the expression of SMA in cultured posterior epiblast. Results indicate that the interaction between the tissues of the posterior epiblast and hypoblast is necessary to initiate the expression of SMA during early cardiogenesis and that nodal and BMP antagonist may play an important role in the regulation of SMA expression.
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Affiliation(s)
- Hiroko Matsui
- Department of Anatomy, Graduate School of Medicine, Osaka City University, Abenoku, Osaka, Japan
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49
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Abstract
Postnatally, heart muscle cells almost completely lose their ability to divide, which makes their loss after trauma irreversible. Potential repair by cell grafting or mobilizing endogenous cells is of particular interest for possible treatments for heart disease, where the poor capacity for cardiomyocyte proliferation probably contributes to the irreversibility of heart failure. Knowledge of the molecular mechanisms that underly formation of heart muscle cells might provide opportunities to repair the diseased heart by induction of (trans) differentiation of endogenous or exogenous cells into heart muscle cells. We briefly review the molecular mechanisms involved in early development of the linear heart tube by differentiation of mesodermal cells into heart muscle cells. Because the initial heart tube does not comprise all the cardiac compartments present in the adult heart, heart muscle cells are added to the distal borders of the tube and within the tube. At both distal borders, mesodermal cell are recruited into the cardiac lineage and, within the heart tube, muscular septa are formed. In this review, the relative late additions of heart muscle cells to the linear heart tube are described and the potential underlying molecular mechanisms are discussed.
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Affiliation(s)
- Maurice J B van den Hoff
- Molecular and Experimental Cardiology Group, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
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Brown CO, Chi X, Garcia-Gras E, Shirai M, Feng XH, Schwartz RJ. The cardiac determination factor, Nkx2-5, is activated by mutual cofactors GATA-4 and Smad1/4 via a novel upstream enhancer. J Biol Chem 2003; 279:10659-69. [PMID: 14662776 DOI: 10.1074/jbc.m301648200] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The mammalian homologue of Drosophila tinman, Nkx2-5, plays an early role in regulating cardiac genes and morphogenesis. Bone morphogenetic proteins (BMPs), members of the transforming growth factor (TGF)-beta family of signaling molecules, are involved in numerous developmental processes. BMP signaling is crucial in the regulation of Nkx2-5 expression and specification of the cardiac lineage. Constitutively active BMP type I receptor or the downstream pathway components and DNA-binding transcription factors, Smad1/4 directly activated Nkx2-5 gene transcription. We identified and characterized a novel upstream Nkx2-5 enhancer, composed of clustered repeats of Smad and GATA DNA binding sites. This composite Nkx2-5 enhancer was a direct target of BMP signaling via cooperative interactions between the downstream transducers Smad1/4 and GATA-4. In mammalian two hybrid assays, Smad factors recruited the hybrid gene GATA4-VP16 to strongly drive transcription of a reporter gene containing multimerized Smad binding sites These cofactors interacted through the second zinc finger and adjacent basic domain of GATA-4 and the N-terminal domain of Smads. Smad4 and GATA4 were also found to bind in vivo with the Nkx2-5 composite enhancer, as revealed by chromatin immunoprecipitation analysis of differentiated P19 cells. Finally, transgenic mice containing the Smad/GATA composite enhancer recapitulated early murine Nkx2-5 cardiac expression and deletion of this enhancer within a 10-kb transgene pBS-Nkx2-5 LacZ significantly reduced expression in the cardiac crescent. Thus, integration of GATA transcription factors with BMP signaling, through co-association with Smads factors, may initiate early Nkx2-5 expression; suggesting a vital role for the combination of these factors in the specification of cardiac progenitors.
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Affiliation(s)
- Carl O Brown
- Department of Molecular and Cellular Biology, The Center for Cardiovascular Development, Baylor College of Medicine, Houston, Texas 77030, USA
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