Publications by authors named "Ryoichi Ito"

Acute myocarditis (AM) is an inflammatory disease of the heart muscle that can progress to fulminant myocarditis (FM), a severe and life-threatening condition. The cytokine profile of myocarditis in children, especially in relation to fulminant myocarditis, is not well understood. This study aims to evaluate the cytokine profiles of acute and fulminant myocarditis in children.

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Multisystem inflammatory syndrome in children (MIS-C), which is associated with the novel coronavirus disease 2019 (COVID-19), has been described as an inflammatory complication of exposure to the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It carries a risk of serious and lethal complications, including cardiogenic shock. Here, we report the pathological findings of the pericardium in a 10-year-old child with MIS-C, who developed pericarditis-induced cardiac tamponade.

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Article Synopsis
  • - The study aims to differentiate neurodegenerative diseases by using I-metaiodobenzylguanidine (MIBG) and evaluating the myocardial standardized uptake value (SUV) for accuracy.
  • - A 17-segment polar map of the heart was created from SPECT-CT images, optimizing the reconstruction conditions to achieve reliable quantitative values, with comparisons made to the heart-to-mediastinum (H/M) ratio.
  • - Results indicated that the myocardial SUV gave slightly more accurate quantitative values than the H/M ratio, and using optimal reconstruction parameters allows for consistent assessment of myocardial uptake.
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Neonates who swallow a considerable amount of maternal blood may exhibit vomiting and suckling disorder during the first few days of the postnatal period. Some clinicians treat these neonates with gastric lavage (GL) to prevent vomiting and the establishment of enteral feeding empirically, but there was no study assessing the effect of GL for neonates with coffee-ground emesis. We designed a multicenter randomized controlled trial to evaluate the efficacy and safety of GL in neonates with coffee-ground emesis.

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Adult neurogenesis occurs more commonly in teleosts, represented by zebrafish, than in mammals. Zebrafish is therefore considered a suitable model to study adult neurogenesis, for which the regulatory molecular mechanisms remain little known. Our previous study revealed that neuroepithelial-like neural stem cells (NSCs) are located at the edge of the dorsomedial region.

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Article Synopsis
  • Multiple bioactive peptides, such as glucagon and GLP-1, were studied by disrupting the glucagon gene in mice, leading to the creation of Gcg(gfp/gfp) knock-in mice that lack these peptides.
  • These Gcg(gfp/gfp) mice were born normally and initially exhibited lower blood glucose levels, but became similar to control mice in terms of glucose levels as they matured, even after starvation.
  • The study suggests that Gcg-derived peptides are not essential for adult mice survival or glucose regulation, and reveals key insights into the roles of certain cells and genes in pancreas and intestinal development.
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As previously reported, the cerebral arterioles are surrounded by unique perivascular Mato cells. They contain many inclusion bodies rich in hydrolytic enzymes, and have strong uptake capacity. They are thus considered scavenger cells of vascular and neural tissues in steady-state.

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We investigated the expression of the genes for matrix metalloproteinases (MMP)-2 and MMP-9 in the ventricle for 1, 2 and 4 days after acute treatment with doxorubicin (DOX) to induce cardiomyopathy in mice, at a single dose of 25 mg kg(-1). Ventricle weights, ventricle weight-to-tail length ratios, and left ventricular systolic and diastolic internal dimensions all decreased time-dependently. Histology showed increased vacuolisation of cardiomyocytes in the DOX-treated mice on day 4 compared with controls.

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Gene expression of heparanase, matrix metalloproteinases (MMP)-2 and MMP-9 were examined in ventricles after chronic treatment with isoproterenol (ISO) induced cardiac hypertrophy in rats. Rats were treated with ISO (4 mg/kg, intraperitoneal) twice daily for 4 d. Ventricle weight of the heart and the ventricle weight/body weight ratio were increased respectively by 22% and 25% compared with control rats.

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Objective: We previously found that ingested cocoa decreased visceral adipose tissue weight in rat. To elucidate the molecular mechanisms of that effect, we carried out experiments aimed at analyzing biochemical parameters and gene expression profiles.

Methods: Rats were fed either of two high-fat diets, differing only in supplementation with real or mimetic cocoa.

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