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Intact in vivo visualization of telencephalic microvasculature in medaka using optical coherence tomography. Sci Rep 2020; 10:19831. [PMID: 33199719 PMCID: PMC7669881 DOI: 10.1038/s41598-020-76468-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 10/28/2020] [Indexed: 11/09/2022] Open
Abstract
To date, various human disease models in small fish-such as medaka (Oryzias lapties)-have been developed for medical and pharmacological studies. Although genetic and environmental homogeneities exist, disease progressions can show large individual differences in animal models. In this study, we established an intact in vivo angiographic approach and explored vascular networks in the telencephalon of wild-type adult medaka using the spectral-domain optical coherence tomography. Our approach, which required neither surgical operations nor labeling agents, allowed to visualize blood vessels in medaka telencephala as small as about 8 µm, that is, almost the size of the blood cells of medaka. Besides, we could show the three-dimensional microvascular distribution in the medaka telencephalon. Therefore, the intact in vivo imaging via optical coherence tomography can be used to perform follow-up studies on cerebrovascular alterations in metabolic syndrome and their associations with neurodegenerative disease models in medaka.
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Dodo Y, Chatani M, Azetsu Y, Hosonuma M, Karakawa A, Sakai N, Negishi-Koga T, Tsuji M, Inagaki K, Kiuchi Y, Takami M. Myelination during fracture healing in vivo in myelin protein zero (p0) transgenic medaka line. Bone 2020; 133:115225. [PMID: 31923703 DOI: 10.1016/j.bone.2020.115225] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/04/2020] [Accepted: 01/05/2020] [Indexed: 12/11/2022]
Abstract
During the fracture healing process, osteoblasts and osteoclasts, as well as the nervous system are known to play important roles for signaling in the body. Glia cells contribute to the healing process by myelination, which can increase the speed of signals transmitted between neurons. However, the behavior of myelinating cells at a fracture site remains unclear. We developed a myelin protein zero (mpz)-EGFP transgenic medaka line for tracing myelinating cells. Mpz-enhanced green fluorescence protein (EGFP)-positive (mpz+) cells are driven by the 2.9-kb promoter of the medaka mpz gene, which is distributed throughout the nervous system, such as the brain, spinal cord, lateral line, and peripheral nerves. In the caudal fin region, mpz+ cells were found localized parallel with the fin ray (bone) in the adult stage. mpz+ cells were not distributed with fli-DsRed positive (fli+) blood vessels, but with some nerve fibers, and were dyed with the anti-acetylated tubulin antibody. We then fractured one side of the caudal lepidotrichia in a caudal fin of mpz-EGFP medaka and found a unique phenomenon, in that mpz+ cells were accumulated at 1 bone away from the fracture site. This mpz+ cell accumulation phenomenon started from 4 days after fracture of the proximal bone. Thereafter, mpz+ cells became elongated from the proximal bone to the distal bone and finally showed a crosslink connection crossing the fracture site to the distal bone at 28 days after fracture. Finally, the effects of rapamycin, known as a mTOR inhibitor, on myelination was examined. Rapamycin treatment of mpz-EGFP/osterix-DsRed double transgenic medaka inhibited not only the crosslink connection of mpz+ cells but also osterix+ osteoblast accumulation at the fracture site, accompanied with a fracture healing defect. These findings indicated that mTOR signaling plays important roles in bone formation and neural networking during fracture healing. Taken together, the present results are the first to show the dynamics of myelinating cells in vivo.
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Affiliation(s)
- Yusuke Dodo
- Department of Pharmacology, Division of Medical Pharmacology, Showa University School of Medicine, Tokyo 142-8555, Japan; Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan; Department of Orthopaedic Surgery, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Masahiro Chatani
- Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan.
| | - Yuki Azetsu
- Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
| | - Masahiro Hosonuma
- Department of Pharmacology, Division of Medical Pharmacology, Showa University School of Medicine, Tokyo 142-8555, Japan; Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
| | - Akiko Karakawa
- Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
| | - Nobuhiro Sakai
- Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
| | - Takako Negishi-Koga
- Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan; Division of Mucosal Barriology, International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan
| | - Mayumi Tsuji
- Department of Pharmacology, Division of Medical Pharmacology, Showa University School of Medicine, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
| | - Katsunori Inagaki
- Department of Orthopaedic Surgery, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Yuji Kiuchi
- Department of Pharmacology, Division of Medical Pharmacology, Showa University School of Medicine, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
| | - Masamichi Takami
- Department of Pharmacology, Showa University School of Dentistry, Tokyo 142-8555, Japan; Pharmacological Research Center, Showa University, Tokyo 142-8555, Japan
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De Miguel E, Álvarez-Otero R. Development of the cerebellum in turbot (Psetta maxima): Analysis of cell proliferation and distribution of calcium binding proteins. J Chem Neuroanat 2017; 85:60-68. [PMID: 28712785 DOI: 10.1016/j.jchemneu.2017.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 07/05/2017] [Accepted: 07/06/2017] [Indexed: 10/19/2022]
Abstract
The morphogenesis, cell proliferation and neuronal differentiation of the turbot (Psetta maxima) cerebellum has been studied using conventional histological techniques and immunohistochemical methods for proliferating cell nuclear antigen and calcium binding proteins. As in other vertebrates, the cerebellar anlage emerges as proliferative plates of neural tissue during the embryonic period. The anlage of the cerebellum persists without morphological changes until the end of the larval life when the mantle zone is differentiated. The major ontogenetic changesthat drive the formation of the cerebellar subdivisions begin in late premetamorphic larvae when cerebellar plates growth and merge medially. This transformation is accomplished by the reorganization of proliferative zones as well as by the onset of cell differentiation. The cerebellum becomes fully differentiated during metamorphosis when parvalbumin and calretinin were detected in Purkinje and eurydendroid cells. Sustained proliferation is maintained in all subdivisions of the cerebellum and this support the robust growth of this part of the brain that takes place during the metamorphic and juvenile periods.The location and histological organization of the proliferative activity in the turbot mature cerebellum are described and their functional significance was analyzed in light of the information available for other teleosts.
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Affiliation(s)
- Encarnación De Miguel
- CINBIO, Centro Singular de Investigación de Galicia 2016-2019, University of Vigo, 36200 Vigo, Spain.
| | - Rosa Álvarez-Otero
- Department of Functional Biology and Health Science, University of Vigo, 36200 Vigo, Spain
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Gladys FM, Matsuda M, Lim Y, Jackin BJ, Imai T, Otani Y, Yatagai T, Cense B. Developmental and morphological studies in Japanese medaka with ultra-high resolution optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2015; 6:297-308. [PMID: 25780725 PMCID: PMC4354602 DOI: 10.1364/boe.6.000297] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 12/11/2014] [Accepted: 12/12/2014] [Indexed: 05/30/2023]
Abstract
We propose ultra-high resolution optical coherence tomography to study the morphological development of internal organs in medaka fish in the post-embryonic stages at micrometer resolution. Different stages of Japanese medaka were imaged after hatching in vivo with an axial resolution of 2.8 µm in tissue. Various morphological structures and organs identified in the OCT images were then compared with the histology. Due to the medaka's close resemblance to vertebrates, including humans, these morphological features play an important role in morphogenesis and can be used to study diseases that also occur in humans.
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Affiliation(s)
- Fanny Moses Gladys
- Center for Optical Research and Education (CORE), Utsunomiya University,
Japan
| | - Masaru Matsuda
- Center for Bioscience Research and Education, Utsunomiya University,
Japan
| | - Yiheng Lim
- Center for Optical Research and Education (CORE), Utsunomiya University,
Japan
| | - Boaz Jessie Jackin
- Center for Optical Research and Education (CORE), Utsunomiya University,
Japan
| | - Takuto Imai
- Center for Bioscience Research and Education, Utsunomiya University,
Japan
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology,
Japan
| | - Yukitoshi Otani
- Center for Optical Research and Education (CORE), Utsunomiya University,
Japan
| | - Toyohiko Yatagai
- Center for Optical Research and Education (CORE), Utsunomiya University,
Japan
| | - Barry Cense
- Center for Optical Research and Education (CORE), Utsunomiya University,
Japan
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Yasuda T, Oda S, Yasuda H, Hibi Y, Anzai K, Mitani H. Neurocytotoxic effects of iron-ions on the developing brain measured in vivo using medaka (Oryzias latipes), a vertebrate model. Int J Radiat Biol 2011; 87:915-22. [PMID: 21770703 PMCID: PMC3169016 DOI: 10.3109/09553002.2011.584944] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2011] [Revised: 04/16/2011] [Accepted: 04/21/2011] [Indexed: 12/02/2022]
Abstract
PURPOSE Exposure to heavy-ion radiation is considered a critical health risk on long-term space missions. The developing central nervous system (CNS) is a highly radiosensitive tissue; however, the biological effects of heavy-ion radiation, which are greater than those of low-linear energy transfer (LET) radiation, are not well studied, especially in vivo in intact organisms. Here, we examined the effects of iron-ions on the developing CNS using vertebrate organism, fish embryos of medaka (Oryzias latipes). MATERIALS AND METHODS Medaka embryos at developmental stage 28 were irradiated with iron-ions at various doses of 0-1.5 Gy. At 24 h after irradiation, radiation-induced apoptosis was examined using an acridine orange (AO) assay and histologically. To estimate the relative biological effectiveness (RBE), we quantified only characteristic AO-stained rosette-shaped apoptosis in the developing optic tectum (OT). At the time of hatching, morphological abnormalities in the irradiated brain were examined histologically. RESULTS The dose-response curve utilizing an apoptotic index for the iron-ion irradiated embryos was much steeper than that for X-ray irradiated embryos, with RBE values of 3.7-4.2. Histological examinations of irradiated medaka brain at 24 h after irradiation showed AO-positive rosette-shaped clusters as aggregates of condensed nuclei, exhibiting a circular hole, mainly in the marginal area of the OT and in the retina. However, all of the irradiated embryos hatched normally without apparent histological abnormalities in their brains. CONCLUSION Our present study indicates that the medaka embryo is a useful model for evaluating neurocytotoxic effects on the developing CNS induced by exposure to heavy iron-ions relevant to the aerospace radiation environment.
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Affiliation(s)
- Takako Yasuda
- Department of Integrated Biosciences, Graduate School of Frontier Sciences, the University of Tokyo, Kashiwa, Chiba.
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