Publications by authors named "Masao Katayama"

Article Synopsis
  • The study investigates how new antirheumatic drugs affect the characteristics of lymphoproliferative disorder (LPD) in rheumatoid arthritis (RA) patients, using data from 53 hospitals in Japan between 1999 and 2021.
  • A total of 752 patients with RA-associated LPD were compared to 770 with sporadic LPD, revealing notable differences in their clinical features and the impact of various drug combinations.
  • The findings suggest that medications taken before LPD onset may alter its characteristics, and recommend tocilizumab (TCZ) as a better treatment option after LPD has developed.
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Article Synopsis
  • - The study investigated surgical antimicrobial prophylaxis (SAP) practices in Japanese hospitals, revealing a lack of data on guidelines adherence and prescription standards.
  • - Conducted across 27 hospitals, the survey found that only 33.9% of surgeries met appropriateness criteria, with a notable variability among surgical fields and hospitals regarding proper antimicrobial selection.
  • - Results indicated that while cefazolin was commonly used, there is a pressing need for ongoing monitoring and interventions to enhance SAP compliance nationwide.
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  • Interstitial lung disease and airway disease are serious complications of rheumatoid arthritis, leading to a poor prognosis among affected individuals.
  • This study examined the genetic factors linked to these lung diseases in Japanese RA patients, specifically focusing on two single nucleotide variants (rs2736100 and rs1278769).
  • Findings indicated that rs2736100 is associated with increased susceptibility to airway disease, while rs1278769 is linked to nonspecific interstitial pneumonia in older patients, marking a significant step in understanding genetic risks in RA-related lung issues.
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Metal chalcogenides - because of their excellent optical and electrical properties - are important semiconductor materials for optical devices, such as solar cells, sensors, and photocatalysts. The challenges associated with metal chalcogenides are the complexity of the conventional synthesis methods and the stringent synthesis conditions. In this study, the synthesis conditions were simplified in a solvent-free synthesis method using cadmium precursor, thiourea and selenium to synthesize metal chalcogenides, such as CdS and CdSe, which have particularly suitable band gaps for the optical devices.

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Objective: Rheumatoid arthritis (RA) is often complicated with chronic lung diseases (CLD), including interstitial lung disease (ILD) and airway disease, which occur as extra-articular manifestations. CLD in RA have been associated with the production of rheumatoid factor (RF), anti-citrullinated peptide antibody (ACPA), or anti-carbamylated protein (CarP) antibody. However, few validation studies have been performed thus far.

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Objective: Anti-aminoacyl-tRNA synthetase (anti-ARS) antibodies are useful for identifying a clinical subset of patients with idiopathic inflammatory myopathies (IIMs). Anti-OJ antibodies, which recognize multi-enzyme synthetase complexes including isoleucyl-tRNA synthetase (IARS) and lysyl-tRNA synthetase (KARS), are among the anti-ARS antibodies. Although testing antibodies to other ARSs have been used clinically, no validated immunoassays for detecting anti-OJ antibodies are available.

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A transparent TaN photoanode is a promising candidate for the front-side photoelectrode in a photoelectrochemical (PEC) cell with tandem configuration (tandem cell), which can potentially provide high solar-to-hydrogen (STH) energy conversion efficiency. This study focuses in particular on the semiconductor properties and interfacial design of transparent TaN photoanodes fabricated on insulating quartz substrates (TaN/SiO), typically the geometric area of 1 × 1 cm in contact with indium on its edge. This material utilizes the self-conductivity of TaN to make the PEC system operational, and the electrode would strongly reflect the intrinsic nature of TaN without a back contact that is commonly introduced.

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Interstitial lung disease (ILD) is an extra-articular manifestation in rheumatoid arthritis (RA), detected in 10.7% of patients, and causing a poor prognosis. Hence, biomarkers for ILD are urgently required in RA.

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Objective: Susceptibility genes that can account for characteristic features of SSc such as fibrosis, vasculopathy and autoimmunity remain to be determined. In mice, deficiency of Friend leukaemia integration 1 transcription factor (Fli1) causes SSc-like disease with these features. The human FLI1 gene contains (GA)n microsatellite, which has been shown to be associated with expression level.

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Photoelectrochemical (PEC) water splitting using visible-light-responsive photoelectrodes is the preferred approach to converting solar energy into hydrogen as a renewable energy source. A transparent Ta N photoanode embedded within a PEC cell having a tandem configuration is a promising configuration that may provide a high solar-to-hydrogen energy conversion efficiency. Ta N thin films are typically prepared by heating precursor films in an NH flow at high temperatures, which tends to degrade the transparent conductive layer, such that producing efficient Ta N transparent photoanodes is challenging.

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Rheumatoid arthritis (RA) is a systemic autoimmune disease characterized by joint destructions and human leukocyte antigen (HLA)-DRB1 is an important genetic risk factor for RA and influences the phenotype of RA. The clinical features of elder age onset RA (EORA) were known to be different from those of younger age onset RA (YORA). Previous studies reported the different association pattern of DRB1 alleles with YORA or EORA.

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Genome-wide association studies of systemic lupus erythematosus (SLE) in Chinese and Korean populations demonstrated strong association of single nucleotide polymorphisms (SNPs) located in the GTF2I-NCF1 region, rs73366469 (GTF2I), rs117026326 (GTF2I), rs80346167(GTF2IRD1) and rs201802880 (NCF1). This region has also been associated with susceptibility to Sjögren syndrome and rheumatoid arthritis; however, association studies with systemic sclerosis (SSc) and ANCA-associated vasculitis (AAV) have not been reported. Here we made an attempt to confirm their associations with SLE in the Japanese population, to find the primarily associated SNP, and to investigate whether these SNPs are also associated with susceptibility to SSc and AAV.

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Aims: To determine the long-term outcomes of ocular adnexal lesions in immunoglobulin G4-related ophthalmic disease (IgG4-ROD).

Methods: This retrospective, non-randomised exploratory study included 82 patients with ocular adnexal lesions. We evaluated the long-term outcomes in 71 patients during the median follow-up period of 30 months, who underwent either watchful waiting (n=20; range 12-90 months) or systemic corticosteroid treatment, delivered according to consensus guidelines (n=51; range 9- 115 months).

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Photocatalytic water splitting is a viable approach to the large-scale production of renewable solar hydrogen. The apparent quantum yield for this reaction has been improved, but the lifespan of photocatalysts functioning under sunlight at ambient pressure have rarely been examined, despite the critical importance of this factor in practical applications. Herein, we show that Al-doped SrTiO (SrTiO:Al) loaded with a RhCrO (rhodium chromium oxide) cocatalyst splits water with an apparent quantum yield greater than 50% at 365 nm.

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Factors, including crystallinity, morphology, size, preferential orientation, growth, composition, porosity, surface area, etc., can directly influence the optical, charge-separation, charge-transfer and water oxidation and reduction properties of particle-based photocatalysts. Therefore, these factors must be considered when designing high-performance particle-based photocatalysts for solar water splitting.

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Photoelectrochemical water splitting is regarded as a promising approach to the production of hydrogen, and the development of efficient photoelectrodes is one aspect of realizing practical systems. In this work, transparent Ta N photoanodes were fabricated on n-type GaN/sapphire substrates to promote O evolution in tandem with a photocathode, to realize overall water splitting. Following the incorporation of an underlying GaN layer, a photocurrent of 6.

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