Publications by authors named "Yanai Ryoji"

Aim: To investigate the efficacy of ripasudil, a Rho kinase inhibitor, in reducing intraocular pressure (IOP) and medication scores of anti-glaucoma drugs in patients with ocular hypertension with inflammation and corticosteroid.

Methods: The study included 11 patients diagnosed with ocular hypertension with inflammation and corticosteroid, all of whom were prescribed ripasudil eye drops and followed up for at least 2y after the initiation of treatment. IOP was measured using a non-contact tonometer before enrollment and at each follow-up visit.

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Administration of intravitreal anti-vascular endothelial growth factor (anti-VEGF) therapy is the first-line therapy for diabetic macular oedema (DME). However, some patients show no or insufficient response to repeated anti-VEGF injections. Therefore, it is necessary to identify factors that can predict this resistance against anti-VEGF treatment.

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  • The study reported on ocular inflammatory events that occurred after COVID-19 vaccination in Japan, focusing on a case series from 16 hospitals with uveitis clinics.
  • A total of 37 patients experienced these events, with a mean age of 53.4 years and symptoms appearing about 6.3 days post-vaccination, most commonly associated with the Pfizer-BioNTech vaccine.
  • The findings suggest that healthcare providers should be aware of the potential for these inflammatory reactions as an adverse effect of COVID-19 vaccination.
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Human cytomegalovirus (HCMV) infections develop into CMV diseases that result in various forms of manifestations in local organs. CMV-retinitis is a form of CMV disease that develops in immunocompromised hosts with CMV-viremia after viruses in the peripheral circulation have entered the eye. In the HCMV genome, extensive diversification of the UL40 gene has produced peptide sequences that modulate NK cell effector functions when loaded onto HLA-E and are subsequently recognized by the NKG2A and NKG2C receptors.

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  • The study aimed to investigate the low prevalence of Fuchs' uveitis syndrome (FUS) in Japan by reviewing medical records of 160 patients diagnosed with the condition at uveitis specialty facilities.
  • Results showed that a significant number of patients were referred for idiopathic uveitis, cataracts, and glaucoma, with most patients experiencing unilateral symptoms and common findings like anterior inflammation and keratic precipitates.
  • The conclusion suggests that the low prevalence of FUS in Japan may be due to misdiagnosis as milder conditions, affecting timely recognition and treatment of the syndrome.
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  • Researchers studied how systemic corticosteroids are used to treat a type of eye inflammation in people with certain diseases in Japan.
  • They looked at 157 patients over several years and found that many had to take these steroids for over 300 days to manage their symptoms.
  • A lot of patients still had relapses and side effects from the steroids, showing it's tough to lower the doses and control the inflammation.
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Age-related macular degeneration (AMD), especially neovascular AMD with choroidal neovascularization (CNV), is the leading cause of blindness in the elderly. Although matrix metalloproteinases (MMPs) are involved in pathological ocular angiogenesis, including CNV, the cellular origin of MMPs in AMD remains unknown. The present study investigated the role of microglial MMPs in CNV.

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  • Early-onset sarcoidosis (EOS) and Blau syndrome (BS) are inflammatory diseases characterized by skin rashes, symmetrical joint pain, and recurrent eye issues, often linked to a specific mutation in the NOD2 gene.
  • A case study presented an 8-year-old girl who had severe eye inflammation and skin lesions, with genetic testing revealing a novel D512V mutation in the NOD2 gene and detection of Propionibacterium acnes in her tissue.
  • Treatment with oral prednisolone was initially started, but after a relapse, the addition of methotrexate led to positive outcomes, emphasizing the importance of genetic analysis for accurate diagnosis in similar cases.
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Purpose: To assess the therapeutic effects of fursultiamine on choroidal neovascularization (CNV) through its modulation of inflammation and metabolic reprogramming in the retinal pigment epithelium (RPE).

Methods: The anti-angiogenic effects of fursultiamine were assessed by measuring vascular leakage and CNV lesion size in the laser-induced CNV mouse model. Inflammatory responses were evaluated by quantitative polymerase chain reaction, western blot, and ELISA in both CNV eye tissues and in vitro cell cultures using ARPE-19 cells or primary human RPE (hRPE) cells under lipopolysaccharide (LPS) treatment or hypoxia.

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: To identify the clinical characteristics of acute retinal necrosis (ARN) and clarify factors associated with poor visual prognosis.: a nationwide multi-center retrospective chart review study was performed in Japan using data from the medical records of 149 consecutive ARN patients. Demographics, ocular signs, virologic testing of intraocular fluids, and treatment were examined.

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To realize direct power generation from biofuels in natural organisms, we demonstrate a needle-type biofuel cell (BFC) using enzyme/mediator/carbon nanotube (CNT) composite fibers with the structure Osmium-based polymer/CNT/glucose oxidase/Os-based polymer/CNT. The composite fibers performed a high current density (10 mA/cm) in 5 mM artificial blood glucose. Owing to their hydrophilicity, they also provided sufficient ionic conductivity between the needle-type anode and the gas-diffusion cathode.

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In the twentieth century, a conspicuous lack of effective treatment strategies existed for managing several retinal disorders, including age-related macular degeneration; diabetic retinopathy (DR); retinopathy of prematurity (ROP); retinitis pigmentosa (RP); uveitis, including Behçet's disease; and vitreoretinal lymphoma (VRL). However, in the first decade of this century, advances in biomedicine have provided new treatment strategies in the field of ophthalmology, particularly biologics that target vascular endothelial growth factor or tumor necrosis factor (TNF)-α. Furthermore, clinical trials on gene therapy specifically for patients with autosomal recessive or X-linked RP have commenced.

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Purpose: Neurotrophic keratopathy is a corneal epitheliopathy induced by trigeminal denervation that can be treated with eyedrops containing the neuropeptide substance P (or the peptide FGLM-NH2 derived therefrom) and insulin-like growth factor 1 (or the peptide SSSR derived therefrom). Here, we examine the mechanism by which substance P (or FGLM-NH2) promotes corneal epithelial wound healing in a mouse model of neurotrophic keratopathy.

Methods: The left eye of mice subjected to trigeminal nerve axotomy in the right eye served as a model of neurotrophic keratopathy.

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Purpose: To evaluate the advantages of the Trinity regimen for treatment-naïve neovascular age-related macular degeneration (nAMD).

Methods: Thirty-one treatment-naïve nAMD eyes were treated using the Trinity regimen with an intravitreal aflibercept injection (IVA) and evaluated after 24 months. Three treatment methods, pro re nata (PRN), treat and extend (TAE), and fixed regimen were changed depending on recurrence frequency.

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An international, expert led consensus initiative was set up by the Collaborative Ocular Tuberculosis Study (COTS) group to develop systematic, evidence, and experience-based recommendations for the treatment of ocular TB using a modified Delphi technique process. In the first round of Delphi, the group identified clinical scenarios pertinent to ocular TB based on five clinical phenotypes (anterior uveitis, intermediate uveitis, choroiditis, retinal vasculitis, and panuveitis). Using an interactive online questionnaires, guided by background knowledge from published literature, 486 consensus statements for initiating ATT were generated and deliberated amongst 81 global uveitis experts.

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We previously showed that dietary omega (ω)-3 long-chain polyunsaturated fatty acids (LCPUFAs) suppress inflammation in mice with experimental autoimmune uveitis (EAU). We have now investigated the role of antigen presenting cells (APCs) in this action of ω-3 LCPUFAs. C57BL/6 mice were fed a diet supplemented with ω-3 or ω-6 LCPUFAs for 2 weeks, after which splenocytes were isolated from the mice and cocultured with CD4+ T cells isolated from mice with EAU induced by injection of a human interphotoreceptor retinoid-binding protein peptide together with complete Freund's adjuvant.

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Subretinal fibrosis has been recognized as a feature of an advanced stage of exudative age-related macular degeneration (AMD) that leads to irreversible loss of vision. This study was aimed at elucidating roles of interlukin-6 (IL-6) in the development of subretinal fibrosis. Immunohistochemistry (IHC) was performed with anti-human IL-6 antibody in surgically excised choroidal neovascular tissues from patients with exudative AMD.

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Article Synopsis
  • A 24-year-old pregnant woman showed symptoms of cat scratch disease including fever, fatigue, and vision issues after feeding a feral dog.
  • Her initial serum tests were negative for the common strain of Bartonella henselae but positive for a newly identified strain (YH-01) specific to Japan.
  • The study suggests that using an IFA assay for the YH-01 strain, or a combination with the Houston-1 strain, could improve the diagnosis of cat scratch disease in Japan.
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Dietary ω-3 long-chain polyunsaturated fatty acids (LCPUFAs) and lutein each protect against age-related macular degeneration (AMD). We here examined the effects of ω-3 LCPUFAs and lutein supplementation in a mouse model of AMD. Mice were assigned to four groups: (1) a control group fed an ω-3 LCPUFA-free diet, (2) a lutein group fed an ω-3 LCPUFA-free diet with oral administration of lutein, (3) an ω-3 group fed an ω-3 LCPUFA-supplemented diet, and (4) an ω-3 + lutein group fed an ω-3 LCPUFA-supplemented diet with oral administration of lutein.

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Purpose: To investigate the roles of P2X7 receptors (P2RX7) in the pathogenesis of experimental autoimmune uveoretinitis (EAU).

Study Design: Experimental.

Methods: Either wild-type (P2rx7 ) or P2rx7-deficient (P2rx7 ) mice were immunized with interphotoreceptor retinoid-binding protein (IRBP) peptide 1-20.

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Purpose: To report 2 cases of paclitaxel-related maculopathy manifesting as cystoid macular edema (CME) with late petaloid hyperfluorescence on indocyanine green angiography (IA).

Cases: A 74-year-old man (patient 1) undergoing paclitaxel chemotherapy for gastric and metastatic liver cancer and a 69-year-old man (patient 2) receiving paclitaxel for hypopharyngeal cancer presented with anorthopia in both eyes. Spectral domain-optical coherence tomography (SD-OCT) revealed macular edema in both eyes of each patient.

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Purpose: To report the clinical features and prognosis of acute retinal necrosis (ARN) in elderly (>80 years of age) individuals.

Methods: Six consecutive patients with unilateral ARN who attended the Department of Ophthalmology at Yamaguchi University Hospital between 2014 and 2015 were retrospectively reviewed. Clinical characteristics, causative virus, time from symptom onset to physician visit, visual acuity at presentation and final visit, and treatment were evaluated and compared between the three elderly and three middle-aged (<80 years) patients.

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