Publications by authors named "Megumi Sakamoto"

Article Synopsis
  • - Canine gastrointestinal lymphoma is mostly T-cell in origin, but the genetic details aren't fully understood.
  • - Previous studies in humans show mutations in genes linked to the JAK-STAT pathway, which are crucial for signaling in immune responses.
  • - In this study of 31 dogs, only a few mutations were found in the STAT3 and JAK1 genes, and there wasn't a strong link between these mutations and large cell gastrointestinal lymphoma in dogs.
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Objectives This study aimed to identify and understand the challenges faced by public school teachers regarding issues related to Internet gaming.Methods An electronic questionnaire was administered to 400 public school teachers in the Saitama Prefecture from September to November 2021. A total of 352 valid responses were obtained.

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L-Asparaginase (L-Asp) is often used to induce remission in feline large-cell gastrointestinal lymphoma (LCGIL). However, no study has evaluated the efficacy and adverse events following the initial use of this drug as a first-line treatment in feline LCGIL. We retrospectively reviewed medical records of cats with LCGIL treated with L-Asp to induce remission.

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Article Synopsis
  • - The novel domestic cat hepadnavirus (DCH) was first identified in Australia and has now been detected in multiple countries, prompting further study of its genome and impact on cat health.
  • - Using next-generation sequencing of a plasma sample from a feverish cat, researchers found that the virus is genetically distinct, with only 89% similarity to the original DCH strain.
  • - An epidemiological survey of 203 cats at a veterinary hospital revealed two positive cases of DCH, both with liver-related health issues, signifying the virus’s presence in cats in the Tokyo area and suggesting further research is needed to understand its clinical significance.
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Advances in "omics" technology have made it possible to study a wide range of cellular phenomena at the single-cell level. Recently, we developed single-cell DNA replication sequencing (scRepli-seq) that measures replication timing (RT) by copy number differences between replicated and unreplicated genomic DNA in replicating single mammalian cells. This method has been used to reveal previously unrecognized static and dynamic natures of several hundred kilobases to a few megabases-scale chromosomal units called RT domains.

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Pancreaticoduodenal artery aneurysms are a rare type of visceral artery aneurysm, whose rupture is associated with high mortality. These aneurysms are of particular interest because local haemodynamic change caused by coeliac artery obstruction plays an important role in their development. However, the pathophysiological mechanism of coeliac artery obstruction is not completely understood.

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Peginterferon is a key drug used to treat chronic viral hepatitis that is known for causing various side effects. Side effects occurring immediately after administration include headache, nausea, and influenza-like symptoms, such as fever and joint pain. However, reports of anaphylactic shock are extremely rare.

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DJ-1 is a protein that is associated with Parkinson disease and cancer, and the reduction of DJ-1 function and expression is also thought to be a cause of diabetes and hypertension. However, little is known about the association between the plasma concentration of DJ-1 and risk of metabolic syndrome. We hypothesized that a lifestyle intervention would increase serum DJ-1 and that up-regulated DJ-1 functions will result in the prevention of metabolic syndrome.

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Coincident with the expanding population of aged people, the incidence of Alzheimer disease (AD) is rapidly increasing in most advanced countries. At present, no effective prophylactics are available. Among several pathological mechanisms proposed for AD, the "amyloid hypothesis" has been most widely accepted, in which accumulation or deposition of Aβ is considered to be the initial event.

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Phospholipase D (PLD), which produces the lipid messenger phosphatidic acid (PA), has been implicated in superoxide generation and degranulation in neutrophils. The basis for this conclusion is the observation that primary alcohols, which interfere with PLD-catalyzed PA production, inhibit these neutrophil functions. However, off-target effects of primary alcohols cannot be totally excluded.

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The cryosensitivity of mammalian embryos depends on the stage of development. Because permeability to water and cryoprotectants plays an important role in cryopreservation, it is plausible that the permeability is involved in the difference in the tolerance to cryopreservation among embryos at different developmental stages. In this study, we examined the permeability to water and glycerol of mouse oocytes and embryos, and tried to deduce the pathway for the movement of water and glycerol.

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