Publications by authors named "Ayumi Matsumoto"

Red yeast rice, traditionally used in Asian cuisine and increasingly marketed as a dietary supplement for cholesterol management, has recently been linked to kidney dysfunction in Japan. In late 2023 to early 2024, multiple cases involving specific Beni-koji (red yeast rice) tablets from three different Beni-koji preparations, prompted a safety reevaluation. Although citrinin, a known nephrotoxin of red yeast rice, was not produced by the implicated strains, new safety concerns emerged.

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Background/objectives: In Southeast Asia, the traditional use of young coconut ( L.) juice (YCJ) by women to alleviate postmenopausal symptoms suggests potential estrogenic properties. However, few studies explore the impact of YCJ on pathologies associated with estrogen deficiency in postmenopausal animal models.

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  • Recent research shows that SLC5A2/SGLT2 inhibitors, like empagliflozin, offer kidney protection in non-diabetic chronic kidney disease (CKD) without clear signs of albuminuria, yet the mechanism of this effect remains unclear.
  • The study used various mouse models, including those with obesity and kidney injury, and found that empagliflozin reduced harmful effects like lipotoxicity, inflammation, and fibrosis in kidney tubules by lowering intraglomerular pressure.
  • Empagliflozin also decreased albumin reabsorption, improved autophagic processes, and lessened the risk of kidney injury, suggesting that enhancing autophagy is key to the protective effects
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  • Deep learning shows promise in analyzing kidney pathology, but its success relies on having large, well-labeled datasets, which are often hard to create.
  • The study utilized a self-supervised learning technique (DINO) on over 10,000 kidney images to extract features, and then tested disease classification using different methods, getting performance metrics like ROC-AUC.
  • Results showed that the DINO model excelled in classifying kidney diseases, achieving a ROC-AUC of 0.93 compared to 0.89 for a conventional model, especially maintaining performance even with limited labeled data.
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Increased dietary phosphate consumption intensifies renal phosphate burden. Several mechanisms for phosphate-induced renal tubulointerstitial fibrosis have been reported. Considering the dual nature of phosphate as both a potential renal toxin and an essential nutrient for the body, kidneys may possess inherent protective mechanisms against phosphate overload, rather than succumbing solely to injury.

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Transient expression and induction of RNA silencing by agroinfiltration is a fundamental method in plant RNA biology. Here, we introduce a new reporter assay using RUBY, which encodes three key enzymes of the betalain biosynthesis pathway, as a polycistronic mRNA. The red pigmentation conferred by betalains allows visual confirmation of gene expression or silencing levels without tissue disruption, and the silencing levels can be quantitatively measured by absorbance in as little as a few minutes.

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  • Commercial STR kits may yield non-specific peaks (NSPs) due to the presence of non-human DNA with similar sequences, complicating data interpretation.
  • The NSPlex method was developed to identify the biological origins of NSPs using leftover STR kit amplicons and advanced bioinformatics techniques like next-generation sequencing and BLAST searches.
  • NSPlex successfully identified NSPs from mixtures of human DNA and matcha powder DNA, proving its effectiveness for NSP analysis without relying on proprietary primer information.
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This study examined how evaluations of self-presentation vary with age depending on the self-presenter's usual performance. People's usual performance is a key factor because it generally influences the social evaluations and judgments that others make about them. Children aged 7 and 8 years (second graders) and 10 and 11 years (fifth graders), as well as adults, were presented with scenarios in which protagonists responded to praise after a good performance using either self-enhancement or self-deprecation.

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  • Volume overload is a serious issue for patients on peritoneal dialysis (PD), and traditional treatments often fall short, leading researchers to explore SGLT2 inhibitors as a potential new solution.
  • The EMPOWERED trial will investigate if the SGLT2 inhibitor empagliflozin can increase ultrafiltration volume in patients with chronic heart failure who use glucose-based PD solutions.
  • Results from this trial could provide valuable insights into fluid management and the impact of SGLT2 inhibitors on overall kidney function in PD patients.
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  • Menkes disease is a rare condition caused by a problem with how the body processes copper, which is linked to changes in a specific gene called ATP7A.
  • A 7-month-old girl with Menkes disease showed serious challenges like learning difficulties and low copper levels, while her mother and grandmother carried the same gene change but weren’t affected.
  • Researchers found that the way X chromosomes were "switched on or off" in the family helped the girl develop Menkes disease, while her mom and grandma didn't have problems because of how their genes worked.
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Background: Compared with the conventional peritoneal dialysis (PD) catheter insertion, embedding PD catheter implantation is one of the procedures for planned PD initiation. However, facilities where embedded PD catheter implantation is available are limited, and the impact of embedded PD catheter implantation on hospitalization cost and length of hospitalization is unknown.

Methods: This retrospective single-center cohort study included 132 patients with PD initiation between 2005 and 2020.

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Mitochondrial fatty acid β-oxidation (FAO) plays a key role in energy homeostasis. Several FAO evaluation methods are currently available, but they are not necessarily suitable for capturing the dynamics of FAO in vivo at a cellular-level spatial resolution and seconds-level time resolution. FAOBlue is a coumarin-based probe that undergoes β-oxidation to produce a fluorescent substrate, 7-hydroxycoumarin-3-(-(2-hydroxyethyl))-carboxamide (7-HC).

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Objective: To evaluate the efficacy and retention rate of lacosamide (LCM) over 36 months as a treatment for children and adolescents with focal and generalized epilepsy based on a retrospective study.

Methods: All patients prescribed LCM as monotherapy and add-on therapy between October 2016 and September 2019 at Jichi Children's Medical Center Tochigi were included in the study. The response rate, retention rate, and adverse effects were calculated.

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Fibroblast growth factor 23, parathyroid hormone, and 1,25-dihydroxyvitamin D are critical in phosphate homeostasis. Despite these factors' importance, regulators of phosphaturia in the acute postprandial phase remain largely unknown. This study investigated the mechanism of acute phosphate regulation in the postprandial phase in rats.

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Autism spectrum disorder (ASD) is caused by combined genetic and environmental factors. Genetic heritability in ASD is estimated as 60-90%, and genetic investigations have revealed many monogenic factors. We analyzed 405 patients with ASD using family-based exome sequencing to detect disease-causing single-nucleotide variants (SNVs), small insertions and deletions (indels), and copy number variations (CNVs) for molecular diagnoses.

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Our previous genome-wide association study to explore genetic loci associated with lean nonalcoholic fatty liver disease (NAFLD) in Japan suggested four candidate loci, which were mapped to chr6, chr7, chr12 and chr13. The present study aimed to identify the locus involved functionally in NAFLD around the association signal observed in chr13. Chromosome conformation capture assay and a database survey suggested the intermolecular interaction among DNA fragments in association signals with the adjacent four coding gene promoters.

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We previously revealed that Kbtbd11 mRNA levels increase during 3T3-L1 differentiation and Kbtbd11 knockdown suppresses whereas its overexpression promotes adipogenesis. However, how Kbtbd11 mRNA is regulated during adipocyte differentiation and how the KBTBD11 protein functions in adipocytes remain elusive. This study aimed to examine the transcriptional regulatory mechanism of Kbtbd11 during adipocyte differentiation, KBTBD11-interacting protein functions, and elucidate the role of KBTBD11 in adipocytes.

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Background: Actin, alpha, skeletal muscle 1 (ACTA1) is one of the causative genes of nemaline myopathy (NM) and congenital fiber-type disproportion (CFTD). CFTD is characterized by type 1 fiber atrophy and distinguished from NM in the absence of rods. Eight patients with CFTD, including one patient with dilated cardiomyopathy (DCM), have previously been reported.

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Previous studies have reported that hypothyroidism can lead to sick sinus syndrome (SSS) or other rhythm disturbances. Variants in the alpha subunit of the cardiac sodium channel (SCN5A) are known to be among the genetic causes of SSS. We encountered an adolescent patient with SSS and hypothyroidism who also harbored an SCN5A variant.

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Background: The distinct diversity of the human skin microbiome depends not only on the body site but also the individual. Host-commensal interactions have been described for the gut microbiome, but little is known about the epidermal microbiome.

Objective: The present study investigated whether genetic variants associated with skin traits affect the axillary microbiome.

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Investigation of plant-bacteria interactions requires quantification of bacterial titers by means of cumbersome and time-consuming colony-counting assays. Here, we devised a broadly applicable tool for bioluminescence-based quantitative and spatial detection of bacteria in plants. We developed vectors that enable Tn transposon-mediated integration of the luciferase operon into a specific genomic location found ubiquitously across bacterial phyla.

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Aims: In previous randomized controlled trials, the use of tolvaptan (TLV) at a fixed dose of 30 mg/day for 1 year did not provide renal benefits in patients with heart failure (HF). This retrospective, cohort study examined the renoprotective effects of long-term, flexible-dose, and lower-dose TLV use.

Methods And Results: Tolvaptan users were defined as patients receiving TLV for at least 180 consecutive days or those who continued it until death, any cardiac events, or renal replacement therapy even if it was taken for <180 days.

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Introduction: Foot process effacement and mitochondrial fission associate with kidney disease pathogenesis. Electron microscopy is the gold-standard method for their visualization, but the observable area of electron microscopy is smaller than light microscopy. It is important to develop alternative ways to quantitatively evaluate these microstructural changes because the lesion site of renal diseases can be focal.

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Article Synopsis
  • A 68-year-old man diagnosed with membranous nephropathy (MN) initially showed negative results for the THSD7A antigen, and his condition partially improved with corticosteroid treatment but later relapsed.* -
  • After two years, the patient was found to have a urinary bladder tumor, which led to further biopsies that eventually revealed THSD7A-positive MN and bladder cancer.* -
  • The case highlights the importance of monitoring for malignancy in MN patients, especially when there's an unexpected return of symptoms or changes in treatment response.*
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