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Kusuyama J, Makarewicz NS, Albertson BG, Alves-Wagner AB, Conlin RH, Prince NB, Alves CR, Ramachandran K, Kozuka C, Xiudong Y, Xia Y, Hirshman MF, Hatta T, Nagatomi R, Nozik ES, Goodyear LJ. Maternal Exercise-Induced SOD3 Reverses the Deleterious Effects of Maternal High-Fat Diet on Offspring Metabolism Through Stabilization of H3K4me3 and Protection Against WDR82 Carbonylation. Diabetes 2022; 71:1170-1181. [PMID: 35290440 PMCID: PMC9163554 DOI: 10.2337/db21-0706] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 03/09/2022] [Indexed: 01/19/2023]
Abstract
Preclinical studies reveal maternal exercise as a promising intervention to reduce the transmission of multigenerational metabolic dysfunction caused by maternal obesity. The benefits of maternal exercise on offspring health may arise from multiple factors and have recently been shown to involve DNA demethylation of critical hepatic genes leading to enhanced glucose metabolism in offspring. Histone modification is another epigenetic regulator, yet the effects of maternal obesity and exercise on histone methylation in offspring are not known. Here, we find that maternal high-fat diet (HFD; 60% kcal from fat) induced dysregulation of offspring liver glucose metabolism in C57BL/6 mice through a mechanism involving increased reactive oxygen species, WD repeat-containing 82 (WDR82) carbonylation, and inactivation of histone H3 lysine 4 (H3K4) methyltransferase leading to decreased H3K4me3 at the promoters of glucose metabolic genes. Remarkably, the entire signal was restored if the HFD-fed dams had exercised during pregnancy. WDR82 overexpression in hepatoblasts mimicked the effects of maternal exercise on H3K4me3 levels. Placental superoxide dismutase 3 (SOD3), but not antioxidant treatment with N-acetylcysteine was necessary for the regulation of H3K4me3, gene expression, and glucose metabolism. Maternal exercise regulates a multicomponent epigenetic system in the fetal liver resulting in the transmission of the benefits of exercise to offspring.
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Affiliation(s)
- Joji Kusuyama
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Japan
- Division of Biomedical Engineering for Health and Welfare, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
- Corresponding authors: Laurie J. Goodyear, , and Joji Kusuyama,
| | - Nathan S. Makarewicz
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Brent G. Albertson
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Ana Barbara Alves-Wagner
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Royce H. Conlin
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Noah B. Prince
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Christiano R.R. Alves
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Krithika Ramachandran
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Chisayo Kozuka
- YCI Laboratory for Metabolic Epigenetics, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Yang Xiudong
- Graduate School of Biomedical Sciences, University of Texas at Houston, Houston, TX
| | - Yang Xia
- Graduate School of Biomedical Sciences, University of Texas at Houston, Houston, TX
| | - Michael F. Hirshman
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
| | - Toshihisa Hatta
- Department of Anatomy, Kanazawa Medical University, Kanazawa, Japan
| | - Ryoichi Nagatomi
- Division of Biomedical Engineering for Health and Welfare, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
- Department of Medicine and Science in Sports and Exercise, Tohoku University School of Medicine, Sendai, Japan
| | - Eva S. Nozik
- Cardiovascular Pulmonary Research Laboratories and Pediatric Critical Care, Department of Pediatrics, University of Colorado Anschutz Medical Center, Aurora, CO
| | - Laurie J. Goodyear
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA
- Corresponding authors: Laurie J. Goodyear, , and Joji Kusuyama,
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Dong S, Xie X, Chen Y, Long G, Liang Q, Zhao Z, Zeng J. Protocol for in utero injection to investigate Zika virus-related fetal microcephaly in mice. STAR Protoc 2022; 3:101057. [PMID: 35005639 PMCID: PMC8715324 DOI: 10.1016/j.xpro.2021.101057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Zika virus (ZIKV) is linked to congenital defects including microcephaly. An infection model that can recapitulate most microcephaly-related phenotypes is crucial for understanding ZIKV pathogenesis. Here, we present a protocol to generate ZIKV from an infectious clone through a reverse genetic system and subsequently perform embryonic brain infection with the rescued ZIKV in pregnant mice. We optimized several aspects of the procedures including virus rescue and in utero injection. This protocol facilitates reproducible investigation of virus-induced cortical development defects. For complete details on the use and execution of this protocol, please refer to Zeng et al. (2020) Workflow of Zika virus (ZIKV) preparation from an infectious clone Protocol for in utero ZIKV injection Details for brain sampling after ZIKV injection Guidelines for ZIKV-related microcephaly phenotype analysis
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Affiliation(s)
- Shupeng Dong
- Research Center of Translational Medicine, Shanghai Children’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200062, China
- Shanghai Institute of Immunology, Department of Immunology and Microbiology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xiaochun Xie
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, CA 90033, USA
- Zikha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming Yunnan 650201, China
- Kunming National High-level Biosafety Research Center for Non-Human Primates, Center for Biosafety Mega-Science, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650107, China
- National Resource Center for Non-Human Primates, National Research Facility for Phenotypic & Genetic Analysis of Model Animals (Primate Facility), Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650107, China
| | - Yujie Chen
- Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Shanghai Institute for Biological Science, Chinese Academy of Sciences, Shanghai, China
| | - Gang Long
- Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Shanghai Institute for Biological Science, Chinese Academy of Sciences, Shanghai, China
| | - Qiming Liang
- Research Center of Translational Medicine, Shanghai Children’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200062, China
- Shanghai Institute of Immunology, Department of Immunology and Microbiology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
- State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200340, China
- Corresponding author
| | - Zhen Zhao
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, CA 90033, USA
- Zikha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
- Corresponding author
| | - Jianxiong Zeng
- Department of Physiology and Neuroscience, University of Southern California, Los Angeles, CA 90033, USA
- Zikha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming Yunnan 650201, China
- Kunming National High-level Biosafety Research Center for Non-Human Primates, Center for Biosafety Mega-Science, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650107, China
- National Resource Center for Non-Human Primates, National Research Facility for Phenotypic & Genetic Analysis of Model Animals (Primate Facility), Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650107, China
- Corresponding author
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Akai T, Hatta T, Sakata-Haga H, Yamamoto S, Otani H, Yamamoto S, Kuroda S. Cerebrospinal fluid may flow out from the brain through the frontal skull base and choroid plexus: a gold colloid and cadaverine injection study in mouse fetus. Childs Nerv Syst 2021; 37:3013-3020. [PMID: 34282473 DOI: 10.1007/s00381-021-05253-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 06/08/2021] [Indexed: 12/01/2022]
Abstract
PURPOSE It has been commonly accepted for a long time that the cerebrospinal fluid (CSF) drains into arachnoid granulations from the subarachnoid space to the dural venous sinus unidirectionally. However, recently, periventricular capillaries and lymphatic concepts have been introduced. The CSF moves along the perivascular space and drains into the capillary vessels or meningeal lymphatic tissues. CSF is involved in removing brain waste out of the brain. In this study, we investigated the outflow mechanism of substances in the CSF from the brain. METHODS We investigated the movement of CSF by injection of gold colloid conjugates (2, 40, and 200 nm) into the lateral ventricles of mouse fetuses and evaluated the deposition by silver stain with tissue transparency and electron microcopy. Cadaverine was also injected into the lateral ventricle to determine its movement tract. RESULTS The gold particle deposition was mainly observed in the frontal skull base. Electron microscopic study showed that the gold particle deposition was observed on the choroid plexus and ependyma in the lateral ventricle and also red blood cells in the heart and liver. Two-nanometer particles were exclusively observed in the liver. Cadaverine injection study demonstrated that cadaverine was observed at the extracranial frontal skull base, choroid plexus, ependymal surface, and perivascular area in the brain white matter. CONCLUSION The particles in the CSF were shown to move from the brain to the frontal skull base and also into the blood stream through the choroid plexus in the fetus. The outflow of particles in the CSF may be regulated by molecular size. This new information will contribute to the prevention of brain degeneration due to brain waste deposition.
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Affiliation(s)
- Takuya Akai
- Department of Neurosurgery, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Sugitani, Toyama, Japan.
| | - Toshihisa Hatta
- Department of Anatomy, Kanazawa Medical University, Uchinada, Ishikawa, Japan
| | - Hiromi Sakata-Haga
- Department of Anatomy, Kanazawa Medical University, Uchinada, Ishikawa, Japan
| | - Seiji Yamamoto
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Toyama, Japan
| | - Hiroki Otani
- Department of Developmental Biology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan
| | - Shusuke Yamamoto
- Department of Neurosurgery, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Sugitani, Toyama, Japan
| | - Satoshi Kuroda
- Department of Neurosurgery, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Sugitani, Toyama, Japan
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Kusuyama J, Alves-Wagner AB, Conlin RH, Makarewicz NS, Albertson BG, Prince NB, Kobayashi S, Kozuka C, Møller M, Bjerre M, Fuglsang J, Miele E, Middelbeek RJW, Xiudong Y, Xia Y, Garneau L, Bhattacharjee J, Aguer C, Patti ME, Hirshman MF, Jessen N, Hatta T, Ovesen PG, Adamo KB, Nozik-Grayck E, Goodyear LJ. Placental superoxide dismutase 3 mediates benefits of maternal exercise on offspring health. Cell Metab 2021; 33:939-956.e8. [PMID: 33770509 PMCID: PMC8103776 DOI: 10.1016/j.cmet.2021.03.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 01/14/2021] [Accepted: 03/03/2021] [Indexed: 12/15/2022]
Abstract
Poor maternal diet increases the risk of obesity and type 2 diabetes in offspring, adding to the ever-increasing prevalence of these diseases. In contrast, we find that maternal exercise improves the metabolic health of offspring, and here, we demonstrate that this occurs through a vitamin D receptor-mediated increase in placental superoxide dismutase 3 (SOD3) expression and secretion. SOD3 activates an AMPK/TET signaling axis in fetal offspring liver, resulting in DNA demethylation at the promoters of glucose metabolic genes, enhancing liver function, and improving glucose tolerance. In humans, SOD3 is upregulated in serum and placenta from physically active pregnant women. The discovery of maternal exercise-induced cross talk between placenta-derived SOD3 and offspring liver provides a central mechanism for improved offspring metabolic health. These findings may lead to novel therapeutic approaches to limit the transmission of metabolic disease to the next generation.
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Affiliation(s)
- Joji Kusuyama
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA; Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Miyagi, Japan.
| | - Ana Barbara Alves-Wagner
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Royce H Conlin
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Nathan S Makarewicz
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Brent G Albertson
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Noah B Prince
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Shio Kobayashi
- Section of Immunobiology, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Chisayo Kozuka
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA; YCI Laboratory for Metabolic Epigenetics, RIKEN Center for Integrative Medical Sciences, Kanagawa, Japan
| | - Magnus Møller
- Department of Gynecology and Obstetrics, Aarhus University Hospital and Clinical Institute, Aarhus University, Aarhus, Denmark
| | - Mette Bjerre
- Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Jens Fuglsang
- Department of Gynecology and Obstetrics, Aarhus University Hospital and Clinical Institute, Aarhus University, Aarhus, Denmark
| | - Emily Miele
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Roeland J W Middelbeek
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Yang Xiudong
- Graduate School of Biomedical Sciences, University of Texas at Houston, Houston, TX, USA
| | - Yang Xia
- Graduate School of Biomedical Sciences, University of Texas at Houston, Houston, TX, USA
| | - Léa Garneau
- Institut du Savoir Montfort, recherche, Ottawa, Canada; Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
| | - Jayonta Bhattacharjee
- School of Human Kinetics, Faculty of Health Science University of Ottawa, Ottawa, Canada
| | - Céline Aguer
- Institut du Savoir Montfort, recherche, Ottawa, Canada; Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada; School of Human Kinetics, Faculty of Health Science University of Ottawa, Ottawa, Canada; Interdisciplinary School of Health Sciences, Faculty of Health Science University of Ottawa, Ottawa, Canada
| | - Mary Elizabeth Patti
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Michael F Hirshman
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Niels Jessen
- Steno Diabetes Center Aarhus, Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Toshihisa Hatta
- Department of Anatomy, Kanazawa Medical University, Ishikawa, Japan
| | - Per Glud Ovesen
- Department of Gynecology and Obstetrics, Aarhus University Hospital and Clinical Institute, Aarhus University, Aarhus, Denmark
| | - Kristi B Adamo
- School of Human Kinetics, Faculty of Health Science University of Ottawa, Ottawa, Canada
| | - Eva Nozik-Grayck
- Cardiovascular Pulmonary Research Laboratories and Pediatric Critical Care, Department of Pediatrics, University of Colorado Anschutz Medical Center, Aurora, CO, USA
| | - Laurie J Goodyear
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA.
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5
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Yamanaka S, Saito Y, Fujimoto T, Takamura T, Tajiri S, Matsumoto K, Yokoo T. Kidney Regeneration in Later-Stage Mouse Embryos via Transplanted Renal Progenitor Cells. J Am Soc Nephrol 2019; 30:2293-2305. [PMID: 31548350 DOI: 10.1681/asn.2019020148] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 08/12/2019] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND The limited availability of donor kidneys for transplantation has spurred interest in investigating alternative strategies, such as regenerating organs from stem cells transplanted into animal embryos. However, there is no known method for transplanting cells into later-stage embryos, which may be the most suitable host stages for organogenesis, particularly into regions useful for kidney regeneration. METHODS We demonstrated accurate transplantation of renal progenitor cells expressing green fluorescent protein to the fetal kidney development area by incising the opaque uterine muscle layer but not the transparent amniotic membrane. We allowed renal progenitor cell-transplanted fetuses to develop for 6 days postoperatively before removal for analysis. We also transplanted renal progenitor cells into conditional kidney-deficient mouse embryos. We determined growth and differentiation of transplanted cells in all cases. RESULTS Renal progenitor cell transplantation into the retroperitoneal cavity of fetuses at E13-E14 produced transplant-derived, vascularized glomeruli with filtration function and did not affect fetal growth or survival. Cells transplanted to the nephrogenic zone produced a chimera in the cap mesenchyme of donor and host nephron progenitor cells. Renal progenitor cells transplanted to conditional kidney-deficient fetuses induced the formation of a new nephron in the fetus that is connected to the host ureteric bud. CONCLUSIONS We developed a cell transplantation method for midstage to late-stage fetuses. In vivo kidney regeneration from renal progenitor cells using the renal developmental environment of the fetus shows promise. Our findings suggest that fetal transplantation methods may contribute to organ regeneration and developmental research.
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Affiliation(s)
- Shuichiro Yamanaka
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Yatsumu Saito
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Toshinari Fujimoto
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Tsuyoshi Takamura
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Susumu Tajiri
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Kei Matsumoto
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Takashi Yokoo
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
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Akai T, Hatta T, Shimada H, Mizuki K, Kudo N, Hatta T, Otani H. Extracranial outflow of particles solved in cerebrospinal fluid: Fluorescein injection study. Congenit Anom (Kyoto) 2018; 58:93-98. [PMID: 28976018 DOI: 10.1111/cga.12257] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 09/12/2017] [Accepted: 09/26/2017] [Indexed: 11/30/2022]
Abstract
Cerebrospinal fluid is thought to be mainly absorbed into arachnoid granules in the subarachnoid space and drained into the sagittal sinus. However, some observations such as late outbreak of arachnoid granules in fetus brain and recent cerebrospinal fluid movements study by magnetic resonance images, conflict with this hypothesis. In this study, we investigated the movement of cerebrospinal fluid in fetuses. Several kinds of fluorescent probes with different molecular weights were injected into the lateral ventricle or subarachnoid space in mouse fetuses at a gestational age of 13 days. The movements of the probes were monitored by live imaging under fluorescent microscope. Following intraventricular injection, the probes dispersed into the 3rd ventricle and aqueduct immediately, but did not move into the 4th ventricle and spinal canal. After injection of low and high molecular weight conjugated probes, both probes dispersed into the brain but only the low molecular weight probe dispersed into the whole body. Following intra-subarachnoid injection, both probes diffused into the spinal canal gradually. Neither probe dispersed into the brain and body. The probe injected into the lateral ventricle moved into the spinal central canal by the fetus head compression, and returned into the aqueduct by its release. We conclude this study as follows: (i) The movement of metabolites in cerebrospinal fluid in the ventricles will be restricted by molecular weight; (ii) Cerebrospinal fluid in the ventricle and in the subarachnoid space move differently; and (iii) Cerebrospinal fluid may not appear to circulate. In the event of high intracranial pressure, the fluid may move into the spinal canal.
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Affiliation(s)
- Takuya Akai
- Department of Neurosurgery, Kanazawa Medical University, Uchinada, Japan.,Department of Neurosurgery, Toyama University, Toyama, Japan
| | - Toshihisa Hatta
- Department of Anatomy, Kanazawa Medical University, Uchinada, Japan
| | - Hiroki Shimada
- Department of Anatomy, Kanazawa Medical University, Uchinada, Japan
| | - Keiji Mizuki
- Department of Nanoscience, Sojo University, Kumamoto, Japan
| | - Nae Kudo
- Department of Nanoscience, Sojo University, Kumamoto, Japan
| | - Taizo Hatta
- Department of Nanoscience, Sojo University, Kumamoto, Japan
| | - Hiroki Otani
- Department of Developmental Biology, Shimane University, Izumo, Japan
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Jahan E, Rafiq AM, Otani H. In utero and exo utero fetal surgery on histogenesis of organs in animals. World J Surg Proced 2015; 5:198-207. [DOI: 10.5412/wjsp.v5.i2.198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Revised: 01/22/2015] [Accepted: 03/18/2015] [Indexed: 02/06/2023] Open
Abstract
Until recently, fetal surgery was only used for fetuses with very poor prognosis who were likely to die without intervention. With advances in imaging, endoscopic techniques, anesthesia and novel interventions, fetal surgery is becoming a realistic option for conditions with less severe prognoses, where the aim is now to improve quality of life rather than simply allow survival. Until forty years ago, the uterus shielded the fetus from observation and therapy. Rapid changes in the diagnosis and treatment of human fetal anatomical abnormalities are due to improved fetal imaging studies, fetal sampling techniques (e.g., amniocentesis and chorionic villus sampling), and a better understanding of fetal pathophysiology derived from laboratory animals. Fetal therapy is the logical culmination of progress in fetal diagnosis. In other words, the fetus is now a patient. Now-a-days, in utero (IU) and exo utero (EU) surgical methods are popular for experimental analyses of the histogenesis of organ development. Using these surgical methods, developmental anomalies can be created and then repaired. By applying microinjection and/or fetal surgery with these methods, models of developmental anomalies such as neural tube defects, temporomandibular joint defects, hip joint defects, digit amputation, limb and digit development and regeneration, and tooth germ transplantation in the jaw could be created and later observed. After observing different types of anomalies, novel IU and EU surgical techniques would be the best approach for repairing or treating those anomalies or diseases. This review will focus on the rationale for the IU and EU creation of animal models of different organ defects or anomalies and their repair, based on analyses of organ histogenesis and pathologic observations. It will also focus in detail on the surgical techniques of both IU and EU methods.
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8
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Denbeigh JM, Nixon BA, Puri MC, Foster FS. Contrast imaging in mouse embryos using high-frequency ultrasound. J Vis Exp 2015:52520. [PMID: 25867243 PMCID: PMC4401211 DOI: 10.3791/52520] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Ultrasound contrast-enhanced imaging can convey essential quantitative information regarding tissue vascularity and perfusion and, in targeted applications, facilitate the detection and measure of vascular biomarkers at the molecular level. Within the mouse embryo, this noninvasive technique may be used to uncover basic mechanisms underlying vascular development in the early mouse circulatory system and in genetic models of cardiovascular disease. The mouse embryo also presents as an excellent model for studying the adhesion of microbubbles to angiogenic targets (including vascular endothelial growth factor receptor 2 (VEGFR2) or αvβ3) and for assessing the quantitative nature of molecular ultrasound. We therefore developed a method to introduce ultrasound contrast agents into the vasculature of living, isolated embryos. This allows freedom in terms of injection control and positioning, reproducibility of the imaging plane without obstruction and motion, and simplified image analysis and quantification. Late gestational stage (embryonic day (E)16.6 and E17.5) murine embryos were isolated from the uterus, gently exteriorized from the yolk sac and microbubble contrast agents were injected into veins accessible on the chorionic surface of the placental disc. Nonlinear contrast ultrasound imaging was then employed to collect a number of basic perfusion parameters (peak enhancement, wash-in rate and time to peak) and quantify targeted microbubble binding in an endoglin mouse model. We show the successful circulation of microbubbles within living embryos and the utility of this approach in characterizing embryonic vasculature and microbubble behavior.
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Affiliation(s)
- Janet M Denbeigh
- Department of Medical Biophysics, University of Toronto; Sunnybrook Research Institute;
| | - Brian A Nixon
- Department of Medical Biophysics, University of Toronto; Sunnybrook Research Institute
| | - Mira C Puri
- Department of Medical Biophysics, University of Toronto; Sunnybrook Research Institute; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto
| | - F Stuart Foster
- Department of Medical Biophysics, University of Toronto; Sunnybrook Research Institute
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9
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Denbeigh JM, Nixon BA, Lee JJY, Jerkic M, Marsden PA, Letarte M, Puri MC, Foster FS. Contrast-enhanced molecular ultrasound differentiates endoglin genotypes in mouse embryos. Angiogenesis 2014; 18:69-81. [PMID: 25298070 DOI: 10.1007/s10456-014-9447-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 09/26/2014] [Indexed: 12/31/2022]
Abstract
Targeted ultrasound contrast imaging has the potential to become a reliable molecular imaging tool. A better understanding of the quantitative aspects of molecular ultrasound technology could facilitate the translation of this technique to the clinic for the purposes of assessing vascular pathology and detecting individual response to treatment. The objective of this study was to evaluate whether targeted ultrasound contrast-enhanced imaging can provide a quantitative measure of endogenous biomarkers. Endoglin, an endothelial biomarker involved in the processes of development, vascular homeostasis, and altered in diseases, including hereditary hemorrhagic telangiectasia type 1 and tumor angiogenesis, was the selected target. We used a parallel plate perfusion chamber in which endoglin-targeted (MBE), rat isotype IgG2 control and untargeted microbubbles were perfused across endoglin wild-type (Eng+/+), heterozygous (Eng+/-) and null (Eng-/-) embryonic mouse endothelial cells and their adhesion quantified. Microbubble binding was also assessed in late-gestation, isolated living transgenic Eng+/- and Eng+/+ embryos. Nonlinear contrast-specific ultrasound imaging performed at 21 MHz was used to collect contrast mean power ratios for all bubble types. Statistically significant differences in microbubble binding were found across genotypes for both in vitro (p<0.05) and embryonic studies (p<0.001); MBE binding was approximately twofold higher in Eng+/+ cells and embryos compared with their Eng+/- counterparts. These results suggest that molecular ultrasound is capable of reliably differentiating between molecular genotypes and relating receptor densities to quantifiable molecular ultrasound levels.
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Affiliation(s)
- J M Denbeigh
- Department of Medical Biophysics, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, S640, Toronto, Ontario, M4N 3M5, Canada,
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Jahan E, Matsumoto A, Rafiq AM, Hashimoto R, Inoue T, Udagawa J, Sekine J, Otani H. Fetal jaw movement affects Ihh signaling in mandibular condylar cartilage development: the possible role of Ihh as mechanotransduction mediator. Arch Oral Biol 2014; 59:1108-18. [PMID: 25033382 DOI: 10.1016/j.archoralbio.2014.06.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 06/12/2014] [Accepted: 06/22/2014] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Jaw movement is an important mechanical factor for prenatal development of the condylar cartilage of mandible. Fetal jaw movement restriction has been shown to cause deformity of the mandibular condyle. We hypothesized that this treatment affects the expression of mechanosensitive molecules, namely Indian hedgehog (Ihh) and Parathyroid hormone related protein (PTHrP) in the condyle. EXPERIMENTAL METHODS We restrained jaw movement by suturing the jaw of E15.5 mouse embryos and allowed them to develop until E18.5 using exo utero system, and analyzed them by immunohistochemistry and in situ hybridization methods. RESULTS Morphological, histomorphometric and immunohistochemical study showed that the mandibular condylar cartilage was reduced and deformed, the volume and total cell numbers in the condylar cartilage were also reduced, and number and/or distribution of 5-bromo-2'-deoxyuridine-positive cells, Ihh-positive cells in the mesenchymal and pre-hypertrophic zones were significantly and correspondingly decreased in the sutured group. Using in situ hybridization, reduced expression of Ihh, PTHrP and their related receptors were observed in condylar cartilage of the sutured embryos. CONCLUSIONS Our results revealed that the altered mechanical stress induced by prenatal jaw movement restriction decreased proliferating cells, the amount of cartilage, and altered expression of the Ihh and PTHrP, suggesting that Ihh act as mechanotransduction mediators in the development of mandibular condylar cartilage.
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Affiliation(s)
- Esrat Jahan
- Department of Developmental Biology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan.
| | - Akihiro Matsumoto
- Department of Developmental Biology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
| | - Ashiq Mahmood Rafiq
- Department of Developmental Biology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
| | - Ryuju Hashimoto
- Department of Clinical Nursing, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
| | - Takayuki Inoue
- Department of Developmental Biology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
| | - Jun Udagawa
- Division of Anatomy and Cell Biology, Department of Anatomy, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Joji Sekine
- Department of Oral & Maxillofacial Surgery, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
| | - Hiroki Otani
- Department of Developmental Biology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo, Shimane 693-8501, Japan
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Inoue T, Hashimoto R, Matsumoto A, Jahan E, Rafiq AM, Udagawa J, Hatta T, Otani H. In vivo analysis of Arg-Gly-Asp sequence/integrin α5β1-mediated signal involvement in embryonic enchondral ossification by exo utero development system. J Bone Miner Res 2014; 29:1554-63. [PMID: 24375788 DOI: 10.1002/jbmr.2166] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 12/02/2013] [Accepted: 12/11/2013] [Indexed: 01/01/2023]
Abstract
Enchondral ossification is a fundamental mechanism for longitudinal bone growth during vertebrate development. In vitro studies suggested that functional blockade with RGD peptides or with an antibody that interferes with integrin α5β1-ligand interactions inhibited pre-hypertrophic chondrocyte differentiation. The purpose of this study is to elucidate in vivo the roles of the integrin α5β1-mediated signal through the Arg-Gly-Asp (RGD) sequence in the cell-extracellular matrix (ECM) interaction in embryonic enchondral ossification by an exo utero development system. We injected Arg-Gly-Asp-Ser (RGDS) peptides and anti-integrin α5β1 antibody (α5β1 ab) in the upper limbs of mouse embryos at embryonic day (E) 15.5 (RGDS-injected limbs, α5β1 ab-injected limbs), and compared the effects on enchondral ossification with those found in the control limbs (Arg-Gly-Glu-Ser peptide-, mouse IgG-, or vehicle-injected, and no surgery) at E16.5. In the RGDS-injected limbs, the humeri were shorter and there were fewer BrdU-positive cells than in the control limbs. The ratios of cartilage length and area to those of the humerus were higher in the RGDS-injected limbs. The ratios of type X collagen to type 2 collagen mRNA and protein (Coll X/Coll 2) were significantly lower in the RGDS-injected limbs. In those limbs, TUNEL-positive cells were hardly observed, and the ratios of fractin to the Coll X/Coll 2 ratio were lower than in the control limbs. Furthermore, the α5β1 ab-injected limbs showed results similar to those of RGDS-injected limbs. The present in vivo study by exo utero development system showed that RGDS and α5β1 ab injection decreased chondrocyte proliferation, differentiation, and apoptosis in enchondral ossification, and suggested that the integrin α5β1-mediated ECM signal through the RGD sequence is involved in embryonic enchondral ossification.
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Affiliation(s)
- Takayuki Inoue
- Department of Developmental Biology, Faculty of Medicine, Shimane University, Shimane, Japan
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12
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Denbeigh JM, Nixon BA, Hudson JM, Puri MC, Foster FS. VEGFR2-targeted molecular imaging in the mouse embryo: an alternative to the tumor model. ULTRASOUND IN MEDICINE & BIOLOGY 2014; 40:389-99. [PMID: 24342913 DOI: 10.1016/j.ultrasmedbio.2013.09.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 09/16/2013] [Accepted: 09/18/2013] [Indexed: 05/13/2023]
Abstract
As a tumor surrogate, the mouse embryo presents as an excellent alternative for examining the binding of angiogenesis-targeting microbubbles and assessing the quantitative nature of molecular ultrasound. We establish the validity of this model by developing a robust method to study microbubble kinetic behavior and investigate the reproducibility of targeted binding in the murine embryo. Vascular endothelial growth factor receptor 2 (VEGFR2)-targeted (MBV), rat immunoglobulin G2 (IgG2) control antibody-targeted (MBC) and untargeted (MBU) microbubbles were introduced into vasculature of living mouse embryos. Non-linear contrast-specific and B-mode ultrasound imaging, performed at 21 MHz with a Vevo-2100 scanner, was used to collect basic perfusion parameters and contrast mean power ratios for all bubble types. We observed a twofold increase (p < 0.001) in contrast mean power ratios for MBV (4.14 ± 1.78) compared with those for MBC (1.95 ± 0.78) and MBU (1.79 ± 0.45). Targeted imaging of endogenous endothelial cell surface markers in mouse embryos is possible with labeled microbubbles. The mouse embryo thus presents as a versatile model for testing the performance of ultrasound molecular targeting, where further development of quantitative imaging techniques may enable rapid evaluations of biomarker expression in studies of vascular development, disease and angiogenesis.
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Affiliation(s)
- Janet M Denbeigh
- Sunnybrook Research Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
| | - Brian A Nixon
- Sunnybrook Research Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - John M Hudson
- Sunnybrook Research Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Mira C Puri
- Sunnybrook Research Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - F Stuart Foster
- Sunnybrook Research Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
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13
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Rafiq AM, Udagawa J, Lundh T, Jahan E, Matsumoto A, Sekine J, Otani H. Mathematical Analysis of Mandibular Morphogenesis by Micro-CT-Based Mouse and Alizarin Red S-Stained-Based Human Studies During Development. Anat Rec (Hoboken) 2011; 295:313-27. [DOI: 10.1002/ar.21535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2011] [Accepted: 10/07/2011] [Indexed: 01/01/2023]
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Kawamoto M, Udagawa J, Hashimoto R, Matsumoto A, Yamada M, Nimura M, Otani H. Adrenocorticotropic tumor cells transplanted into mouse embryos affect pancreatic histogenesis. Congenit Anom (Kyoto) 2011; 51:62-9. [PMID: 21198907 DOI: 10.1111/j.1741-4520.2010.00313.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A wide range of individual differences exist in the total number of functional and structural units in each organ, such as β cells in pancreatic islands, and these units are the basis of the organ's overall function, including its functional reserve. The endocrine environment may influence organ histogenesis, during which functional and structural units are formed and increase in number. We analyzed the effects of a continuous high level of adrenocorticotropic hormone (ACTH) and/or secondarily induced glucocorticoid on histogenesis of the pancreas in mouse embryos. Pituitary tumor-derived AtT20 cells, which secrete ACTH continuously, were injected subcutaneously into mouse embryos at embryonic day (E) 12.5, and the embryos were allowed to develop exo utero until E18.5 (AtT20 group). E18.5 AtT20 group embryos with high ACTH levels (23.74 ± 6.19 ng/mL vs control group, 0.48 ± 0.40 ng/mL, P < 0.05) were examined for the effects on histogenesis of the pancreas. Using serial sections of the E18.5 pancreas, we stereologically measured the volumes, and counted total cell numbers and numbers of mitotic or pyknotic cells of the whole pancreas, endocrine and exocrine cells, and glucagon-immunopositive α cells and insulin-immunopositive β cells in the endocrine part. Although the volumes of the whole pancreas and exocrine part did not change significantly, in the AtT20 group the endocrine part was significantly larger, with fewer pyknotic cells and lower ratios of α and β cells than in the control group. These results suggest that the high level of ACTH and/or glucocorticoid affects histogenesis of the pancreas.
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Affiliation(s)
- Mai Kawamoto
- Department of Developmental Biology, Faculty of Medicine, Shimane University, Izumo, Japan
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15
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Garcia MD, Udan RS, Hadjantonakis AK, Dickinson ME. Live imaging of mouse embryos. Cold Spring Harb Protoc 2011; 2011:pdb.top104. [PMID: 21460058 PMCID: PMC6800220 DOI: 10.1101/pdb.top104] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
INTRODUCTIONThe development of the mouse embryo is a dynamic process that requires the spatial and temporal coordination of multiple cell types as they migrate, proliferate, undergo apoptosis, and differentiate to form complex structures. However, the confined nature of embryos as they develop in utero limits our ability to observe these morphogenetic events in vivo. Previous work has used fixed samples and histological methods such as immunofluorescence or in situ hybridization to address expression or localization of a gene of interest within a developmental time line. However, such methods do not allow us to follow the complex, dynamic movements of individual cells as the embryo develops. Genetic manipulation methods now allow us to label virtually any cell type or protein of interest fluorescently, providing powerful insights into morphogenetic events at cellular and subcellular resolutions. The development of ex vivo embryo culture methods combined with high-resolution imaging now provides a strong platform for observing morphogenetic events as they occur within the developing embryo. In this article, we discuss the advantages of live embryo imaging for observing dynamic morphogenetic events in vivo.
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Otani H, Udagawa J, Hatta T, Kagohashi Y, Hashimoto R, Matsumoto A, Satow F, Nimura M. Individual variation in organ histogenesis as a causative factor in the developmental origins of health and disease: unnoticed congenital anomalies? Congenit Anom (Kyoto) 2010; 50:205-11. [PMID: 20831656 DOI: 10.1111/j.1741-4520.2010.00295.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Morphological studies of congenital anomalies have mainly focused on abnormal shape (i.e. malformation) and thus on disturbed organogenesis. However, in regard to postnatal functions of organs that develop through branching mechanisms, organ size is another important morphological feature. These organs consist of a large number of structural and functional units, such as nephrons in the kidney, and the total number of these units, that is approximately proportional to the organ size, has been shown to vary widely among individuals. Organ-specific cells are differentiated and organized to form structural units and realize organ-specific functions during the histogenetic period (i.e. from mid-gestation to the early postnatal period). The total number of units is attained at the end of histogenesis and determines the total functional capacity, including the functional reserve of the organ, and thus may be related to predispositions to postnatal organ-based diseases, because the functional reserve decreases during the course of life and eventually become short of the minimum requirement of each organ. Therefore, it may be hypothesized that a smaller number of units of organs at the end of histogenesis is one of the predisposing factors for postnatal diseases (i.e. a form of unnoticed but late-manifested congenital anomalies), in this era of extended longevity. However, the mechanisms that control the total number of units in each organ during histogenesis and the possible relationship among the numbers of units in different organs remain unknown. Here, we review our trials based on the above hypothesis in order to (1) mathematically analyze the morphometric data of the different organs in fetuses to elucidate relationship among developing organs, (2) analyze the developing neuro-immuno-endocrine network as a series of mechanisms to systemically correlate the histogenesis of multiple organs, and (3) examine the maternal environment, including dietary fat, as a factor to influence histogenesis and thus the predisposition to type 1 diabetes.
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Affiliation(s)
- Hiroki Otani
- Department of Developmental Biology, Faculty of Medicine, Shimane University, Izumo, Shimane, Japan.
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Jahan E, Matsumoto A, Udagawa J, Rafiq AM, Hashimoto R, Rahman OIF, Habib H, Sekine J, Otani H. Effects of restriction of fetal jaw movement on prenatal development of the temporalis muscle. Arch Oral Biol 2010; 55:919-27. [PMID: 20728868 DOI: 10.1016/j.archoralbio.2010.07.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 06/14/2010] [Accepted: 07/27/2010] [Indexed: 12/29/2022]
Abstract
Jaw movement affects masticatory muscles during the postnatal period. Prenatal jaw movement has also been implicated in the development of the temporomandibular joint; however, its effect on prenatal development of the masticatory muscles has not been extensively analysed. In the present study, we examined the effects of the restriction of fetal jaw movement on the temporalis muscle, a major masticatory muscle, in mice by suturing the maxilla and mandible (sutured group) using an exo utero development system. We compared the morphology of the temporalis muscle between sutured, sham-operated and normal in utero groups. At embryonic day (E) 18.5, the volume of muscle fibres, but not that of connective tissue, in the temporalis muscle was decreased in the sutured group. The E18.5 temporalis muscle in the sutured group appeared morphologically similar to that of the E17.5 in utero group, except for frequent muscle fibre irregularities. By transmission electron microscopy, in the sutured group, the myofibrils were immature and scattered, the nuclei appeared comparatively immature, the mitochondria were expanded in volume with fewer cristae, and cytoplasmic inclusion bodies were frequently observed. Expression of Myf-6, a late myogenic transcription factor, by real-time RT-PCR was not significantly different between the sutured and sham-operated groups. These findings demonstrated approximately 1-day delay in the morphological development of the temporalis muscle in the sutured group, and some abnormalities were observed, although Myf-6 level was not affected in the sutured group. The present study revealed that the prenatal jaw movement influences the development of the temporalis muscle.
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Affiliation(s)
- Esrat Jahan
- Department of Developmental Biology, Shimane University, Enya-cho, Izumoshi, Japan
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Abstract
Mammalian development has been best characterized using the mouse model. Direct intervention of the postimplantation mouse embryo in utero represents one of many experimental approaches that can be used to probe mammalian embryogenesis. Experimental access to the mouse embryo is difficult, but techniques have been developed to circumvent some of the challenges of operating on the embryo in vivo. Experimental studies have been carried out on postimplantation stage embryos from E8.5 to term, so much of the gestational period is accessible for experimentation. One approach that has helped to enhance embryo accessibility was the development of surgical techniques based on the finding that embryonic development continued normally exo utero. Exo utero development refers to the surgically created condition in which the embryo develops outside of the uterine cavity, yet within the female abdominal cavity and attached, via the placenta, to the uterus. Using this approach it is feasible to carry out precise surgical manipulations of the mouse embryo without compromising embryo viability associated with postsurgery uterine contractions. In this chapter we review technical aspects of both in utero and exo utero surgical approaches and how these surgeries are used in conjunction with other experimental applications.
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Affiliation(s)
- Valérie Ngô-Muller
- CNRS EAC4413, Functional and Adaptative Biology, Physiology of the Gonadotrope Axis, Université Paris Diderot, Paris, France
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