Publications by authors named "Hozumi K"

Purpose: Favorable stereoacuity does not develop in all patients with partially refractive accommodative esotropia (PRAET) successfully aligned, and there have been few previous reports on the factors influencing stereoacuity outcomes in patients with PRAET treated with prismatic correction (PPC) and/or surgery. This study aimed to analyze factors affecting stereoacuity outcomes in patients of PRAET treated with PPC and surgery.

Study Design: Retrospective study.

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  • * Using mouse models treated with clodronate-liposomes to deplete macrophages, researchers found that Klebsiella pneumoniae can damage the intestinal lining and spread to the liver.
  • * The findings highlight the crucial role of intestinal macrophages in preventing the translocation of commensal K. pneumoniae to the liver, suggesting that these mouse models can be useful for developing treatments to combat K. pneumoniae infections.
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Visual field disorders caused by cerebral aneurysms are diverse, nonspecific, and vary in their degree of compression. They should be distinguished from those caused by other common diseases, such as glaucoma.

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Background: Alpha-2-glycoprotein 1, zinc-binding (ZAG), a secreted protein encoded by the AZGP1 gene, is structurally similar to HLA class I. Despite its presumed immunological function, little is known about its role in tumor immunity. In this study, we thus aimed to determine the relationship between the expression of AZGP1/ZAG and the immunological profiles of breast cancer tissues at both the gene and protein level.

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  • Adherent-invasive Escherichia coli (AIEC) is linked to Crohn's disease and has a unique ability to invade the intestinal lining, but how it became invasive is still unclear.
  • In research, it was discovered that AIEC produces more flagellin (fliC) compared to non-AIEC strains, leading to longer flagellar filaments crucial for its invasion and movement capabilities.
  • The study also revealed that a molecule called cyclic-di-AMP (c-di-AMP) can enhance fliC expression and flagellar development in both AIEC and non-AIEC strains, suggesting a potential mechanism for inducing invasive behavior even in non-invasive bacteria.
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Purpose: To report a case of functional visual loss (FVL) diagnosed through bilateral randomized visual field testing using Imo vifa with a trick method.

Observations: A 27-year-old man complained of visual field abnormality in his left eye after falling from a height of 4 m. The left eye had a best-corrected visual acuity (BCVA) of 20/16 and a critical flicker frequency (CFF) of 44.

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Bone marrow endothelial cells (BMECs) play a key role in bone formation and haematopoiesis. Although recent studies uncovered the cellular taxonomy of stromal compartments in the bone marrow (BM), the complexity of BMECs is not fully characterized. In the present study, using single-cell RNA sequencing, we defined a spatial heterogeneity of BMECs and identified a capillary subtype, termed type S (secondary ossification) endothelial cells (ECs), exclusively existing in the epiphysis.

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Purpose: The purpose of this study was to investigate the relationship among suppression scotoma size, stereoacuity, and four-prism base-out test (4ΔBOT) results in anisometropic amblyopia with successfully treated visual acuity.

Methods: We included 103 cases of anisometropic amblyopia successfully treated for visual acuity without strabismus. Stereoacuity was measured using a Randot Stereotest.

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Immunosenescence refers to the development of weakened and/or dysfunctional immune responses associated with aging. Several commensal bacteria can be pathogenic in immunosuppressed individuals. Although Klebsiella pneumoniae is a commensal bacterium that colonizes human mucosal surfaces, the gastrointestinal tract, and the oropharynx, it can cause serious infectious diseases, such as pneumonia, urinary tract infections, and liver abscesses, primarily in elderly patients.

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  • AIEC, a pathobiont linked to Crohn's disease, thrives in inflammatory conditions and is believed to worsen the disease, yet how the immune system reacts to it remains poorly understood.
  • Researchers used antibiotic-treated mice to study how the immune system produces IgA antibodies against AIEC following colonization, while examining IgA binding to various strains.
  • The findings indicate that IgA specifically recognizes AIEC, which helps prevent its invasion into the epithelial cells of the colon, suggesting a protective role of IgA in combating this pathobiont.
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  • - The study investigates how hormone receptors (estrogen, progesterone, and androgen) influence immune responses in breast cancer, aiming to find new treatment strategies.
  • - Using data from METABRIC and SCAN-B, researchers found that estrogen and androgen receptor levels were associated with lower immune cell presence in breast cancer tissue, particularly affecting T cells and macrophages.
  • - Results indicate that higher expression of hormone receptors correlates with specific immune profiles, suggesting a complex interaction that could inform therapeutic approaches targeting breast cancer immunity.
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Imeglimin is a recently launched antidiabetic drug structurally related to metformin. To provide insight into the pharmacological properties of imeglimin, we investigated its effects on hepatocytes and compared them with those of metformin. The effects of imeglimin on mitochondrial function in HepG2 cells or mouse primary hepatocytes were examined with an extracellular flux analyzer and on gene expression in HepG2 cells by comprehensive RNA-sequencing analysis.

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Hematopoietic stem and progenitor cells can differentiate into all types of blood cells. Regulatory mechanisms underlying pluripotency in progenitors, such as the ability of lymphoid progenitor cells to differentiate into T-lineage, remain unclear. We have previously reported that LIM domain only 2 (Lmo2), a bridging factor in large transcriptional complexes, is essential to retain the ability of lymphoid progenitors to differentiate into T-lineage.

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There is uncertainty regarding the need for COVID-19 peri-vaccination glucocorticoid coverage in patients with adrenal insufficiency. In this survey conducted in a single tertiary medical institution, 167 consecutive outpatients taking physiological glucocorticoids because of adrenal insufficiency were included. The patients declared if they developed an adrenal crisis after vaccination, and the amount and duration of an increase in their glucocorticoid dosage, if any.

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Background: There is no standard therapy for hemodialysis (HD) patients with COVID-19. Data on remdesivir in HD patients with COVID-19 are scarce.

Methods: We retrospectively analyzed 25 HD patients with COVID-19 treated with remdesivir.

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Purpose: To investigate potential clinical and multimodal imaging factors in central serous chorioretinopathy (CSC) recurrence.

Methods: The study was performed at nine Japanese medical institutions for patients who had experienced an active CSC episode. Demographic data and medical history were reviewed retrospectively.

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Tumor-infiltrating lymphocytes (TILs) and programmed cell death 1 ligand 1 (PD-L1) are established prognostic and predictive biomarkers for certain breast cancer subsets. However, their association with the immune response complexity is not fully understood. Therefore, we analyzed the association between the immune cell fractions in breast cancer tissues and histologically assessed TIL (hTIL) and PD-L1 (hPD-L1).

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Primary cilia are ubiquitous hair-like organelles, usually projecting from the cell surface. They are essential for the organogenesis and homeostasis of various physiological functions, and their dysfunction leads to a plethora of human diseases. However, there are few reports on the role of primary cilia in the immune system; therefore, we focused on their role in the thymus that nurtures immature lymphocytes to full-fledged T cells.

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  • - T-cell development in the thymus requires Notch signaling activated by the interaction between Notch1 on T-cell precursors and Dll4 on thymic epithelial cells, with Dll4 evolving from a common ancestor of various fish species.
  • - Dll1, rather than Dll4, is crucial for T-cell development in cartilaginous fishes, and experiments show that Dll1 can fully compensate for the absence of Dll4 in mouse models, triggering important Notch signaling pathways.
  • - The study indicates that Dll1 activates Notch signaling involving Notch1 and Notch2, while Dll4 is restricted to activating only Notch1 in the thymus, suggesting a significant evolutionary shift
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Notch signaling is one of the most common drivers of carcinogenesis in many types of cancers, including hepatocellular carcinoma (HCC); however, it occasionally suppresses tumor progression. Moreover, it is virtually unknown how different sets of Notch ligands and receptors regulate the HCC development. In this study, we demonstrate that the expression of the Notch ligands, Delta-like 4 (Dll4) and Jagged-1 (Jag1), is upregulated during diethylnitrosamine-induced hepatocarcinogenesis.

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Several clinical manifestations of COVID-19 have been reported in the literature since then. In addition to upper respiratory symptoms, dysgeusia and anosmia are relatively common neurological manifestations with COVID-19. We had five cases of hiccups in succession; therefore, we assume that hiccups might be a specific symptom of COVID-19.

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  • Patients with inflammatory bowel disease (IBD), specifically those with ulcerative colitis (UC) and Crohn's disease (CD), frequently experience oral health issues like periodontitis, yet its impact on gut inflammation is poorly understood.
  • A study involving 60 IBD patients and 45 healthy controls revealed that the gut microbiome of IBD patients was more similar to their oral microbiome, indicating an increased colonization of gut bacteria by oral bacteria.
  • While early periodontitis didn't significantly alter clinical outcomes for most IBD patients, it was associated with a worsening activity index in some CD patients, suggesting it could exacerbate symptoms in certain cases.
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Purpose: To investigate the clinical characteristics of central serous chorioretinopathy (CSC) with age.

Study Design: Retrospective, cross-sectional study.

Methods: One-hundred and forty-seven CSC patients were classified into three age groups (aged <50 years (younger group; n=53), 50-70 years (middle group; n=68), and >70 years (senior group; n=26)) and the characteristics were compared.

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