Publications by authors named "Ohshima J"

Article Synopsis
  • - This research analyzed gene expression changes in the periodontal ligament (PDL) after tooth re-plantation in mice, focusing on identifying key genes and healing pathways over a period from 3 to 56 days post-replantation.
  • - Findings showed significant gene expression shifts on day 28, particularly an increase in olfactory receptor and G protein-coupled receptor pathways, validated by additional RT-qPCR and staining techniques.
  • - The study suggests that olfactory receptor genes may play a crucial role in wound healing for PDL fibroblasts, highlighting day 28 as a critical phase for regeneration and offering insight into potential new therapies for tooth replantation and broader applications in oral regenerative medicine.
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Introduction: Concentrated growth factor (CGF) is a new-generation autologous platelet concentrate that promotes tissue regeneration and has anti-inflammatory properties. This randomized multicenter trial aimed to evaluate the effects of CGF on bone healing in combination with root-end microsurgery.

Methods: Healthy adult patients indicated for root-end microsurgery were randomly assigned to either the CGF or control (no CGF implantation) groups.

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The anatomical characteristics (fiber length and fiber area) and mechanical properties (modulus of elasticity, modulus of rupture, compressive strength, tensile Young's modulus, and tensile strength) of Bambusa vulgaris, Bambusa maculata, and Gigantochloa atter, naturally growing at four different sites in Lombok Island, Indonesia, were examined for evaluating geographic and longitudinal variations by mixed-effects modeling to effectively utilize bamboo culm resources for structural materials. We found geographic and longitudinal variations of bamboo culm properties in these three species. Based on the results, we concluded that, for utilization of bamboo culm as a structural material, variation of individual culm rather than site, and longitudinal variations should be considered for Bambusa species and G.

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Article Synopsis
  • Although current pulp-capping materials don't prioritize healing, research found that specific proteins (S100A7 and S100A8) in degraded dentin can enhance dental pulp repair.
  • Researchers hypothesized that functional peptides derived from those proteins could provide a more effective and cost-efficient alternative to direct protein use in pulp therapy.
  • Their study identified four promising peptides, with one from S100A8 showing superior ability to stimulate dentin formation in a rat model by reducing inflammation, suggesting these peptides could improve dental pulp treatment outcomes.
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The MLL-10 trial (UMIN000004801) modified a Children's Oncology Group (COG) AALL0631 therapy for infants with KMT2A-rearranged acute lymphoblastic leukemia (ALL). In 2016, one registered case developed secondary immunodeficiency during maintenance therapy and eventually died due to cytomegalovirus infection. Around the same time, fatal secondary immunodeficiencies were reported in five infants with ALL in North America who had received COG-based chemotherapy between 1996 and 2015.

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Article Synopsis
  • Allogeneic HSCT for infants with KMT2A-r ALL has uncertain benefits and risks, leading the MLL-10 trial to limit its use to high-risk patients only.
  • Out of 56 high-risk participants, most achieved complete remission, resulting in a 3-year event-free survival rate of 56.8% and overall survival rate of 80.2%.
  • While results were promising, there is concern over severe toxicities, suggesting that HSCT criteria might need to be further restricted in favor of newer, less harmful treatments.
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Although 10 years have passed since Japan's Fukushima nuclear accident, the future radiation risk from Cs contamination of wood via root uptake is a serious concern. We estimated the depth at which the roots of evergreen coniferous sugi (Cryptomeria japonica) and broadleaf deciduous konara (Quercus serrata) trees actively take up soil water by using positive δD values from the artificial DO tracer and seasonal changes in the δO values of soil water as a natural environmental tracer. We compared the tracer concentration changes in xylem sap with those in the soil water and ascertained that both tree species primarily took up water from a depth of 20 cm, though with mixing of water from other depths.

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We examined the physical and mechanical properties of wood in Siberian larch (Larix sibirica) trees that grow naturally in five Mongolian provenances (Khentii, Arkhangai, Zavkhan, Khuvsgul, and Selenge) and the geographic variations between them. Five trees with stem diameters of 20 to 30 cm at 1.3 m above ground were collected from each provenance.

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Protein-tyrosine phosphorylation in bacteria plays a significant role in multiple cellular functions, including those related to community development and virulence. Metal-dependent protein tyrosine phosphatases that belong to the polymerase and histindinol phosphatase (PHP) family are widespread in Gram-positive bacteria. Here, we show that , a Gram-negative periodontal pathogen, expresses a PHP protein, Php1, with divalent metal ion-dependent tyrosine phosphatase activity.

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Article Synopsis
  • This study emphasizes the importance of individualized busulfan (BU) dosing for infants undergoing hematopoietic stem cell transplantation (HSCT) due to limited existing pharmacokinetic (PK) data.* -
  • Infants exhibit significant variability in key BU PK indices like clearance and volume of distribution, especially with oral administration; therefore, dose adjustments based on PK data are crucial even after initial dosing.* -
  • While maintaining steady-state concentrations of 600-900 ng/mL is challenging, achieving this range appears to reduce transplant-related complications while still supporting successful engraftment in infants with specific leukemia.*
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The polymicrobial microbiome of the oral cavity is a direct precursor of periodontal diseases, and changes in microhabitat or shifts in microbial composition may also be linked to oral squamous cell carcinoma. Dysbiotic oral epithelial responses provoked by individual organisms, and which underlie these diseases, are widely studied. However, organisms may influence community partner species through manipulation of epithelial cell responses, an aspect of the host microbiome interaction that is poorly understood.

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Background: Central venous (CV) catheters are required for chemotherapy but they may become a source of life-threatening infections of the bloodstream. The most effective way to disinfect the port of a CV catheter has not been established.

Methods: We report the data obtained between April 2008 and March 2010 using 83% ethanol (period I) and between April 2010 and March 2014 using 10% povidone-iodine (period II) to sterilize the access port.

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Objectives: Acute leukemia often causes osteoarthralgia. The aim of this study is characterization of leukemia-associated osteoarthralgia in comparison with juvenile idiopathic arthritis (JIA).

Methods: We retrospectively reviewed clinical records of 31 patients with acute leukemia and 13 patients with articular JIA diagnosed between January 2008 and March 2013.

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Primary intracranial rhabdomyosarcoma is quite rare, and its prognosis is poor compared with that for rhabdomyosarcoma in other organs. The authors present a case of pineal rhabdomyosarcoma successfully managed with multimodal therapy including surgery, chemotherapy, radiation, and high-dose chemotherapy (HDC) followed by autologous peripheral blood stem cell transplantation (HDC/APBSCT). An 8-year-old girl presenting with headache and nausea was referred to the authors' institution.

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GVHD and graft failure are serious problems in CBT. PES after CBT also occurs frequently and is associated with transplantation-related complications such as acute GVHD. We reviewed medical records for 70 consecutive child CBT recipients between December 1997 and April 2015.

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Also known as Sqstm1, p62 is a selective autophagy adaptor with a ubiquitin-binding domain. However, the role of p62 in the host defense against Toxoplasma gondii infection is unclear. Here, we show that interferon γ (IFN-γ) stimulates ubiquitin and p62 recruitment to T.

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IFN-γ orchestrates cell-autonomous host defense against various intracellular vacuolar pathogens. IFN-γ-inducible GTPases, such as p47 immunity-related GTPases (IRGs) and p65 guanylate-binding proteins (GBPs), are recruited to pathogen-containing vacuoles, which is important for disruption of the vacuoles, culminating in the cell-autonomous clearance. Although the positive regulation for the proper recruitment of IRGs and GBPs to the vacuoles has been elucidated, the suppressive mechanism is unclear.

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Mammalian target of rapamycin (mTOR) plays crucial roles in activation and differentiation of diverse types of immune cells. Although several lines of evidence have demonstrated the importance of mTOR-mediated signals in CD4(+) T cell responses, the involvement of mTOR in CD8(+) T cell responses is not fully understood. In this study, we show that a class IV semaphorin, SEMA4A, regulates CD8(+) T cell activation and differentiation through activation of mTOR complex (mTORC) 1.

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Toxoplasma gondii infection results in co-option and subversion of host cellular signaling pathways. This process involves discharge of T. gondii effector molecules from parasite secretory organelles such as rhoptries and dense granules.

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IFN-γ mediates cellular innate immunity against an intracellular parasite, Toxoplasma gondii, by inducing immunity-related GTPases such as p47 IFN-γ-regulated GTPases (IRGs) and p65 guanylate-binding proteins (GBPs), which also participate in antibacterial responses via autophagy. An essential autophagy protein, Atg5, was previously shown to play a critical role in anti-T. gondii cell-autonomous immunity.

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Although the pyrazolone derivative sulpyrine is widely used as an antipyretic analgesic drug, side effects, including fatal shock, have been reported. However, the molecular mechanism underlying such a severe side effect is largely unclear. Here, we report that the transcription factor CREBH that is highly expressed in the liver plays an important role in fatal shock induced by sulpyrine in mice.

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Interferon-γ (IFN-γ) is essential for host defense against intracellular pathogens. Stimulation of innate immune cells by IFN-γ upregulates ∼2,000 effector genes such as immunity-related GTPases including p65 guanylate-binding protein (Gbp) family genes. We show that a cluster of Gbp genes was required for host cellular immunity against the intracellular parasite Toxoplasma gondii.

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