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Goto T, Miyagawa S, Tamai K, Matsuura R, Harada A, Ueno T, Toda K, Kuratani T, Sawa Y. P5391Systemic administration of high-mobility group box 1 can suppress adverse post-infarction ventricular remodeling in a rat infarction model by enhancing self-regeneration. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
High-mobility group box 1 protein (HMGB1) reportedly enhances CXCR4-positive bone marrow-derived mesenchymal stem cell (BM-MSC) recruitment to damaged tissue to promote tissue regeneration.
Purpose
Our aim of this study is to evaluate whether systemic administration of HMGB1 might promote tissue repair in a rat myocardial infarction (MI) model.
Methods
We prepared 26 MI model rats with high ligation of the left coronary artery. Two weeks later, HMGB1 (3 mg/kg/day) or phosphate-buffered saline (control: 3 mL/kg/day) was administered for 4 days via femoral vein. Cardiac performance was evaluated by ultrasonography, left ventricular (LV) remodeling via immunostaining. We then used immunostaining to examine MSC recruitment to damaged tissue in green fluorescent protein bone marrow transplantation (GFP-BMT) model rats, and also performed intravital imaging using two-photon microscopy to visualize BM-cells recruitment in real time.
Results
Compared with control rats, there was a significant improvement in the left ventricular ejection fraction of the HMGB1 group (HMGB1 vs. control: 48.6% ± 5.5% vs. 33.6% ± 5.4%; p<0.01) at 4 weeks after each administration. LV remodeling, characterized by interstitial fibrosis, cardiomyocyte hypertrophy, and a decrease of capillary density, was significantly attenuated in the HMGB1 group compared with control rats. On QT-PCR analysis, VEGF mRNA expression was significantly higher in the HMGB1 group than in the control (border zone; 1.6±0.6 vs. 1.1±0.2; p=0.02, septal zone; 1.1±0.1 vs. 0.9±0.1; p<0.01). In GFP-BMT rats, GFP+/PDGFR+ cells were significantly mobilized to the border zone in the HMGB1 group compared with the control (1331±197 vs. 615±45 /mm2; p<0.01), leading to formation of newly developed vasculature (Figure 1). In intravital imaging, more GFP+ cells were mobilized to the infarction area in the HMGB1 group than in the control, which was further enhanced at 12h later. Additionally, SDF-1 expression in the peri-infarction area increased significantly in MI rats compared with normal rats (MI vs. normal; 2.1±0.4 vs. 0.9±0.1; p<0.01), in where some cell-adhesions of vascular endothelial cells were destroyed.
Conclusions
Systemic administration of HMGB1 mobilized BM-MSCs to the damaged myocardium via the SDF-1/CXCR4 signaling complex. Those BM-MSCs might migrate to extracellular matrix in the border zone via the gap of each endothelial cell, leading to induction of angiogenesis and reduced fibrosis.
Acknowledgement/Funding
None
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Fukuda S, Kaneshige A, Kaji T, Noguchi YT, Takemoto Y, Zhang L, Tsujikawa K, Kokubo H, Uezumi A, Maehara K, Harada A, Ohkawa Y, Fukada SI. Sustained expression of HeyL is critical for the proliferation of muscle stem cells in overloaded muscle. eLife 2019; 8:48284. [PMID: 31545169 PMCID: PMC6768661 DOI: 10.7554/elife.48284] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 09/19/2019] [Indexed: 12/20/2022] Open
Abstract
In overloaded and regenerating muscle, the generation of new myonuclei depends on muscle satellite cells (MuSCs). Because MuSC behaviors in these two environments have not been considered separately, MuSC behaviors in overloaded muscle remain unexamined. Here, we show that most MuSCs in overloaded muscle, unlike MuSCs in regenerating muscle, proliferate in the absence of MyoD expression. Mechanistically, MuSCs in overloaded muscle sustain the expression of Heyl, a Notch effector gene, to suppress MyoD expression, which allows effective MuSC proliferation on myofibers and beneath the basal lamina. Although Heyl-knockout mice show no impairment in an injury model, in a hypertrophy model, their muscles harbor fewer new MuSC-derived myonuclei due to increased MyoD expression and diminished proliferation, which ultimately causes blunted hypertrophy. Our results show that sustained HeyL expression is critical for MuSC proliferation specifically in overloaded muscle, and thus indicate that the MuSC-proliferation mechanism differs in overloaded and regenerating muscle.
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Sato S, Arimura Y, Kujirai T, Harada A, Maehara K, Nogami J, Ohkawa Y, Kurumizaka H. Biochemical analysis of nucleosome targeting by Tn5 transposase. Open Biol 2019; 9:190116. [PMID: 31409230 PMCID: PMC6731594 DOI: 10.1098/rsob.190116] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Tn5 transposase is a bacterial enzyme that integrates a DNA fragment into genomic DNA, and is used as a tool for detecting nucleosome-free regions of genomic DNA in eukaryotes. However, in chromatin, the DNA targeting by Tn5 transposase has remained unclear. In the present study, we reconstituted well-positioned 601 dinucleosomes, in which two nucleosomes are connected with a linker DNA, and studied the DNA integration sites in the dinucleosomes by Tn5 transposase in vitro. We found that Tn5 transposase preferentially targets near the entry-exit DNA regions within the nucleosome. Tn5 transposase minimally cleaved the dinucleosome without a linker DNA, indicating that the linker DNA between two nucleosomes is important for the Tn5 transposase activity. In the presence of a 30 base-pair linker DNA, Tn5 transposase targets the middle of the linker DNA, in addition to the entry-exit sites of the nucleosome. Intriguingly, this Tn5-targeting characteristic is conserved in a dinucleosome substrate with a different DNA sequence from the 601 sequence. Therefore, the Tn5-targeting preference in the nucleosomal templates reported here provides important information for the interpretation of Tn5 transposase-based genomics methods, such as ATAC-seq.
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Murakami K, Kiriyama M, Kubo T, Saiki N, Miwa K, Irino Y, Toh R, Hirata K, Harada A. Establishment Of An Automated Assay For Cholesterol Uptake Capacity, A New Concept Of High-Density Lipoprotein Functionality. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kobayakawa K, DePetro KA, Zhong H, Pham B, Hara M, Harada A, Nogami J, Ohkawa Y, Edgerton VR. Locomotor Training Increases Synaptic Structure With High NGL-2 Expression After Spinal Cord Hemisection. Neurorehabil Neural Repair 2019; 33:225-231. [PMID: 30782076 DOI: 10.1177/1545968319829456] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND We previously demonstrated that step training leads to reorganization of neuronal networks in the lumbar spinal cord of rodents after a hemisection (HX) injury and step training, including increases excitability of spinally evoked potentials in hindlimb motor neurons. METHODS In this study, we investigated changes in RNA expression and synapse number using RNA-Seq and immunohistochemistry of the lumbar spinal cord 23 days after a mid-thoracic HX in rats with and without post-HX step training. RESULTS Gene Ontology (GO) term clustering demonstrated that expression levels of 36 synapse-related genes were increased in trained compared with nontrained rats. Many synaptic genes were upregulated in trained rats, but Lrrc4 (coding NGL-2) was the most highly expressed in the lumbar spinal cord caudal to the HX lesion. Trained rats also had a higher number of NGL-2/synaptophysin synaptic puncta in the lumbar ventral horn. CONCLUSIONS Our findings demonstrate clear activity-dependent regulation of synapse-related gene expression post-HX. This effect is consistent with the concept that activity-dependent phenomena can provide a mechanistic drive for epigenetic neuronal group selection in the shaping of the reorganization of synaptic networks to learn the locomotion task being trained after spinal cord injury.
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Noguchi YT, Nakamura M, Hino N, Nogami J, Tsuji S, Sato T, Zhang L, Tsujikawa K, Tanaka T, Izawa K, Okada Y, Doi T, Kokubo H, Harada A, Uezumi A, Gessler M, Ohkawa Y, Fukada SI. Cell-autonomous and redundant roles of Hey1 and HeyL in muscle stem cells: HeyL requires Hes1 to bind diverse DNA sites. Development 2019; 146:dev.163618. [DOI: 10.1242/dev.163618] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Accepted: 01/31/2019] [Indexed: 12/20/2022]
Abstract
The undifferentiated state of muscle stem (satellite) cells (MuSCs) is maintained by the canonical Notch pathway. Although three bHLH transcriptional factors, Hey1, HeyL, and Hes1, are considered to be potential effectors of the Notch pathway exerting anti-myogenic effects, neither HeyL nor Hes1 inhibits myogenic differentiation of myogenic cell lines. Furthermore, whether these factors work redundantly or cooperatively is unknown. Here, we showed cell-autonomous functions of Hey1 and HeyL in MuSCs using conditional and genetic null mice. Analysis of cultured MuSCs revealed anti-myogenic activity of both HeyL and Hes1. We found that HeyL forms heterodimeric complexes with Hes1 in living cells. Moreover, our ChIP-Seq experiments demonstrated that, compared with HeyL alone, HeyL-Hes1 heterodimer bound with high affinity to specific sites in the chromatin including the cis-element of Hey1. Finally, the analyses of myogenin promoter activity showed that HeyL and Hes1 acted synergistically to suppress myogenic differentiation. Collectively, those results suggest that HeyL and Hey1 function redundantly in MuSCs, and that HeyL requires Hes1 for effective DNA binding and biological activity.
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Handa T, Handa T, Harada A, Maehara K, Ohkawa Y, Kimura H. Detailed protocol ─ Chromatin Integration labeling. ACTA ACUST UNITED AC 2018. [DOI: 10.1038/protex.2018.122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Harada A, Maehara K, Handa T, Arimura Y, Nogami J, Hayashi-Takanaka Y, Shirahige K, Kurumizaka H, Kimura H, Ohkawa Y. A chromatin integration labelling method enables epigenomic profiling with lower input. Nat Cell Biol 2018; 21:287-296. [DOI: 10.1038/s41556-018-0248-3] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 11/06/2018] [Indexed: 12/24/2022]
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Harada A, Umeno J, Esaki M. Gastrointestinal: Multiple venous malformations and polyps of the small intestine in Cowden syndrome. J Gastroenterol Hepatol 2018; 33:1819. [PMID: 29952025 DOI: 10.1111/jgh.14304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 05/28/2018] [Indexed: 01/23/2023]
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Harada A, Sumi M, Toshiyasu T, Yoshioka Y, Takazawa Y, Ae K, Matsumoto S, Oguchi M. Palliative Radiation Therapy for Spinal Metastasis from Myxoid Liposarcoma. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kudou K, Komatsu T, Nogami J, Maehara K, Harada A, Saeki H, Oki E, Maehara Y, Ohkawa Y. The requirement of Mettl3-promoted MyoD mRNA maintenance in proliferative myoblasts for skeletal muscle differentiation. Open Biol 2018; 7:rsob.170119. [PMID: 28878038 PMCID: PMC5627051 DOI: 10.1098/rsob.170119] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 07/27/2017] [Indexed: 12/21/2022] Open
Abstract
Myogenic progenitor/stem cells retain their skeletal muscle differentiation potential by maintaining myogenic transcription factors such as MyoD. However, the mechanism of how MyoD expression is maintained in proliferative progenitor cells has not been elucidated. Here, we found that MyoD expression was reduced at the mRNA level by cell cycle arrest in S and G2 phases, which in turn led to the absence of skeletal muscle differentiation. The reduction of MyoD mRNA was correlated with the reduced expression of factors regulating RNA metabolism, including methyltransferase like 3 (Mettl3), which induces N6-methyladenosine (m6A) modifications of RNA. Knockdown of Mettl3 revealed that MyoD RNA was specifically downregulated and that this was caused by a decrease in processed, but not unprocessed, mRNA. Potential m6A modification sites were profiled by m6A sequencing and identified within the 5' untranslated region (UTR) of MyoD mRNA. Deletion of the 5' UTR revealed that it has a role in MyoD mRNA processing. These data showed that Mettl3 is required for MyoD mRNA expression in proliferative myoblasts.
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Harada A, Maehara K, Ono Y, Taguchi H, Yoshioka K, Kitajima Y, Xie Y, Sato Y, Iwasaki T, Nogami J, Okada S, Komatsu T, Semba Y, Takemoto T, Kimura H, Kurumizaka H, Ohkawa Y. Histone H3.3 sub-variant H3mm7 is required for normal skeletal muscle regeneration. Nat Commun 2018; 9:1400. [PMID: 29643389 PMCID: PMC5895627 DOI: 10.1038/s41467-018-03845-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 03/16/2018] [Indexed: 12/12/2022] Open
Abstract
Regulation of gene expression requires selective incorporation of histone H3 variant H3.3 into chromatin. Histone H3.3 has several subsidiary variants but their functions are unclear. Here we characterize the function of histone H3.3 sub-variant, H3mm7, which is expressed in skeletal muscle satellite cells. H3mm7 knockout mice demonstrate an essential role of H3mm7 in skeletal muscle regeneration. Chromatin analysis reveals that H3mm7 facilitates transcription by forming an open chromatin structure around promoter regions including those of myogenic genes. The crystal structure of the nucleosome containing H3mm7 reveals that, unlike the S57 residue of other H3 proteins, the H3mm7-specific A57 residue cannot form a hydrogen bond with the R40 residue of the cognate H4 molecule. Consequently, the H3mm7 nucleosome is unstable in vitro and exhibited higher mobility in vivo compared with the H3.3 nucleosome. We conclude that the unstable H3mm7 nucleosome may be required for proper skeletal muscle differentiation. Incorporation of histone H3 variant H3.3 into chromatin regulates transcription. Here the authors find that H3.3 sub-variant H3mm7 is required for skeletal muscle regeneration and that H3mm7 nucleosomes are unstable and exhibit higher mobility, with H3mm7 promoting open chromatin around promoters.
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Kondo Y, Higa S, Iwasaki T, Matsumoto T, Maehara K, Harada A, Baba Y, Fujita M, Ohkawa Y. Sensitive detection of fluorescence in western blotting by merging images. PLoS One 2018; 13:e0191532. [PMID: 29352284 PMCID: PMC5774814 DOI: 10.1371/journal.pone.0191532] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 01/05/2018] [Indexed: 01/19/2023] Open
Abstract
The western blotting technique is widely used to analyze protein expression levels and protein molecular weight. The chemiluminescence method is mainly used for detection due to its high sensitivity and ease of manipulation, but it is unsuitable for detailed analyses because it cannot be used to detect multiple proteins simultaneously. Recently, more attention has been paid to the fluorescence detection method because it is more quantitative and is suitable for the detection of multiple proteins simultaneously. However, fluorescence detection can be limited by poor image resolution and low detection sensitivity. Here, we describe a method to detect fluorescence in western blots using fluorescence microscopy to obtain high-resolution images. In this method, filters and fluorescent dyes are optimized to enhance detection sensitivity to a level similar to that of the chemiluminescence method.
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Ueda J, Harada A, Urahama T, Machida S, Maehara K, Hada M, Makino Y, Nogami J, Horikoshi N, Osakabe A, Taguchi H, Tanaka H, Tachiwana H, Yao T, Yamada M, Iwamoto T, Isotani A, Ikawa M, Tachibana T, Okada Y, Kimura H, Ohkawa Y, Kurumizaka H, Yamagata K. Testis-Specific Histone Variant H3t Gene Is Essential for Entry into Spermatogenesis. Cell Rep 2017; 18:593-600. [PMID: 28099840 DOI: 10.1016/j.celrep.2016.12.065] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 10/16/2016] [Accepted: 12/20/2016] [Indexed: 01/09/2023] Open
Abstract
Cellular differentiation is associated with dynamic chromatin remodeling in establishing a cell-type-specific epigenomic landscape. Here, we find that mouse testis-specific and replication-dependent histone H3 variant H3t is essential for very early stages of spermatogenesis. H3t gene deficiency leads to azoospermia because of the loss of haploid germ cells. When differentiating spermatogonia emerge in normal spermatogenesis, H3t appears and replaces the canonical H3 proteins. Structural and biochemical analyses reveal that H3t-containing nucleosomes are more flexible than the canonical nucleosomes. Thus, by incorporating H3t into the genome during spermatogonial differentiation, male germ cells are able to enter meiosis and beyond.
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Shiraishi K, Shindo A, Harada A, Kurumizaka H, Kimura H, Ohkawa Y, Matsuyama H. Roles of histone H3.5 in human spermatogenesis and spermatogenic disorders. Andrology 2017; 6:158-165. [DOI: 10.1111/andr.12438] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/06/2017] [Accepted: 10/02/2017] [Indexed: 12/11/2022]
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Semba Y, Harada A, Maehara K, Oki S, Meno C, Ueda J, Yamagata K, Suzuki A, Onimaru M, Nogami J, Okada S, Akashi K, Ohkawa Y. Chd2 regulates chromatin for proper gene expression toward differentiation in mouse embryonic stem cells. Nucleic Acids Res 2017; 45:8758-8772. [PMID: 28549158 PMCID: PMC5587750 DOI: 10.1093/nar/gkx475] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 05/15/2017] [Indexed: 12/21/2022] Open
Abstract
Chromatin reorganization is necessary for pluripotent stem cells, including embryonic stem cells (ESCs), to acquire lineage potential. However, it remains unclear how ESCs maintain their characteristic chromatin state for appropriate gene expression upon differentiation. Here, we demonstrate that chromodomain helicase DNA-binding domain 2 (Chd2) is required to maintain the differentiation potential of mouse ESCs. Chd2-depleted ESCs showed suppressed expression of developmentally regulated genes upon differentiation and subsequent differentiation defects without affecting gene expression in the undifferentiated state. Furthermore, chromatin immunoprecipitation followed by sequencing revealed alterations in the nucleosome occupancy of the histone variant H3.3 for developmentally regulated genes in Chd2-depleted ESCs, which in turn led to elevated trimethylation of the histone H3 lysine 27. These results suggest that Chd2 is essential in preventing suppressive chromatin formation for developmentally regulated genes and determines subsequent effects on developmental processes in the undifferentiated state.
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Oguchi M, Harada A, Taguchi S, Terui Y, Hatake K, Takeuchi K, Fujisaki J. Difference of Relapse Pattern Between Nodal and Gastrointestinal Follicular Lymphomas. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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43
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Nakamura M, Nishikawa R, Hashimoto N, Ishihara T, Uezono H, Harada A, Mayahara H, Ejima Y, Nishimura H. Dosimetric Parameters Predicting Local Failure after Stereotactic Body Radiation Therapy Using the Robotic Radiosurgery System for Oligometastatic Lesions in the Lung and Liver. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Murofushi K, Tokumasu K, Kuwabara H, Kumai Y, Yoshida M, Harada A, Okubo H, Asari T, Toshiyasu T, Sumi M, Oguchi M. Interim MRI Provides Accurate Information of Brachytherapy for Patients with Locally Advanced Cervical Cancer. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Matsuura R, Miyagawa S, Harada A, Toda K, Kikuta J, Ishii M, Sawa Y. 5923Real-time cellular imaging of the beating heart in rat by using two-photon microscopy with an original stabilizer. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.5923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Matsui Y, Fujita R, Harada A, Sakurai T, Nemoto T, Toba K. GRIP PERFORMANCE AGILITY MEASURED WITH A NEW DYNAMOMETER IN SUBJECTS OF ALZHEIMER’S DEMENTIA PATIENTS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Taguchi H, Xie Y, Horikoshi N, Maehara K, Harada A, Nogami J, Sato K, Arimura Y, Osakabe A, Kujirai T, Iwasaki T, Semba Y, Tachibana T, Kimura H, Ohkawa Y, Kurumizaka H. Crystal Structure and Characterization of Novel Human Histone H3 Variants, H3.6, H3.7, and H3.8. Biochemistry 2017; 56:2184-2196. [DOI: 10.1021/acs.biochem.6b01098] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Shiraishi K, Shindo A, Harada A, Ohkawa Y, Kurumizaka H, Kimura H, Matsuyama H. MP07-11 ROLES OF HISTONE H3.5 IN HUMAN SPERMATOGENESIS AND SPERMATOGENIC DISORDERS. J Urol 2017. [DOI: 10.1016/j.juro.2017.02.277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yokota K, Kobayakawa K, Saito T, Hara M, Kijima K, Ohkawa Y, Harada A, Okazaki K, Ishihara K, Yoshida S, Kudo A, Iwamoto Y, Okada S. Periostin Promotes Scar Formation through the Interaction between Pericytes and Infiltrating Monocytes/Macrophages after Spinal Cord Injury. THE AMERICAN JOURNAL OF PATHOLOGY 2017; 187:639-653. [PMID: 28082119 DOI: 10.1016/j.ajpath.2016.11.010] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 11/11/2016] [Accepted: 11/22/2016] [Indexed: 01/13/2023]
Abstract
Scar formation is a prominent pathological feature of traumatic central nervous system (CNS) injury, which has long been implicated as a major impediment to the CNS regeneration. However, the factors affecting such scar formation remain to be elucidated. We herein demonstrate that the extracellular matrix protein periostin (POSTN) is a key player in scar formation after traumatic spinal cord injury (SCI). Using high-throughput RNA sequencing data sets, we found that the genes involved in the extracellular region, such as POSTN, were significantly expressed in the injured spinal cord. The expression of POSTN peaked at 7 days after SCI, predominantly in the scar-forming pericytes. Notably, we found that genetic deletion of POSTN in mice reduced scar formation at the lesion site by suppressing the proliferation of the pericytes. Conversely, we found that recombinant POSTN promoted the migration capacity of the monocytes/macrophages and increased the expression of tumor necrosis factor-α from the monocytes/macrophages in vitro, which facilitated the proliferation of pericytes. Furthermore, we revealed that the pharmacological blockade of POSTN suppressed scar formation and improved the long-term functional outcome after SCI. Our findings suggest a potential mechanism whereby POSTN regulates the scar formation after SCI and provide significant evidence that POSTN is a promising therapeutic target for CNS injury.
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Kuniyoshi Y, Maehara K, Iwasaki T, Hayashi M, Semba Y, Fujita M, Sato Y, Kimura H, Harada A, Ohkawa Y. Identification of Immunoglobulin Gene Sequences from a Small Read Number of mRNA-Seq Using Hybridomas. PLoS One 2016; 11:e0165473. [PMID: 27788226 PMCID: PMC5082856 DOI: 10.1371/journal.pone.0165473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 10/12/2016] [Indexed: 11/23/2022] Open
Abstract
Identification of immunoglobulin genes in hybridomas is essential for producing antibodies for research and clinical applications. A couple of methods such as RACE and degenerative PCR have been developed for determination of the Igh and Igl/Igk coding sequences (CDSs) but it has been difficult to process a number of hybridomas both with accuracy and rapidness. Here, we propose a new strategy for antibody sequence determination by mRNA-seq of hybridomas. We demonstrated that hybridomas highly expressed the Igh and Igl/Igk genes and that de novo transcriptome assembly using mRNA-seq data enabled identification of the CDS of both Igh and Igl/Igk accurately. Furthermore, we estimated that only 30,000 sequenced reads are required to identify immunoglobulin sequences from four different hybridoma clones. Thus, our approach would facilitate determining variable CDSs drastically.
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