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  1. Article ; Online: Current Status and Perspectives on Recurrent IgA Nephropathy after Kidney Transplantation.

    Kawabe, Mayuko / Yamamoto, Izumi

    Nephron

    2023  Volume 147 Suppl 1, Page(s) 9–13

    Abstract: IgA nephropathy (IgAN) is the most common form of glomerulonephritis worldwide. IgAN progresses to end-stage kidney disease in 20-40% of patients within 20 years of diagnosis. Kidney transplantation is the most effective option for patients with end- ... ...

    Abstract IgA nephropathy (IgAN) is the most common form of glomerulonephritis worldwide. IgAN progresses to end-stage kidney disease in 20-40% of patients within 20 years of diagnosis. Kidney transplantation is the most effective option for patients with end-stage kidney disease caused by IgAN, but recurrence can occur in the transplanted kidney. The IgAN recurrence rate varies from 1% to 10% per year and varies according to the follow-up period, diagnostic modality, and biopsy criteria. Of note, studies based on protocol biopsies have reported a higher incidence of recurrence, which also occurred earlier after transplantation. In addition, recent data show that recurrence of IgAN is a more significant cause of allograft failure than previously believed. Little is known about the pathophysiology of IgAN recurrence, but several potential biomarkers have been investigated. Among them, galactose-deficient IgA1 (Gd-IgA1), IgG anti-Gd-IgA1 antibodies, and soluble CD89 could play a pivotal role in disease activity. This review aims to describe the current status of recurrent IgAN, including the incidence, clinical characteristics, risk factors, and future perspectives, with a focus on the available therapeutic approaches.
    MeSH term(s) Humans ; Glomerulonephritis, IGA/etiology ; Glomerulonephritis, IGA/surgery ; Glomerulonephritis, IGA/diagnosis ; Kidney Transplantation/adverse effects ; Immunoglobulin A ; Kidney Failure, Chronic/surgery ; Kidney Failure, Chronic/etiology
    Chemical Substances galactosyl-deficient IgA1 ; Immunoglobulin A
    Language English
    Publishing date 2023-03-24
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 207121-6
    ISSN 2235-3186 ; 1423-0186 ; 1660-8151 ; 0028-2766
    ISSN (online) 2235-3186 ; 1423-0186
    ISSN 1660-8151 ; 0028-2766
    DOI 10.1159/000530341
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: A case of pulmonary hyalinizing granuloma characterized by pseudohyponatremia due to hyperproteinemia.

    Yamauchi, Mariko / Kamejima, Sahoko / Yamamoto, Izumi / Ohkido, Ichiro / Araya, Jun / Yokoo, Takashi

    Respiratory medicine case reports

    2023  Volume 43, Page(s) 101854

    Abstract: A 57-year-old man presented with multiple pulmonary nodules. Thoracoscopic lung biopsy led to a pathological diagnosis of pulmonary hyalinizing granuloma (PHG) at the age of 39 years. The disease was progressive, refractory to therapy, and necessitated ... ...

    Abstract A 57-year-old man presented with multiple pulmonary nodules. Thoracoscopic lung biopsy led to a pathological diagnosis of pulmonary hyalinizing granuloma (PHG) at the age of 39 years. The disease was progressive, refractory to therapy, and necessitated home oxygen therapy 10 years after the diagnosis. Hyponatremia progressed gradually along with lung disease. His serum sodium level was 129 mEq/L but serum osmolality was normal (287 mOsm/kg). Concomitant hyperproteinemia (12.1 g/dL) was attributable to hyperglobulinemia. Direct ion-selective electrode measurement revealed a normal sodium level (137 mmol/L). We herein report a case of PHG characterized by pseudohyponatremia due to hyperproteinemia, an uncommon finding in this rare entity. A left lung transplant was successfully performed, and no pseudohyponatremia was observed. Pseudohyponatremia should be suspected and diagnosed to prevent a misdiagnosis that could lead to complications from inappropriate treatment with sodium supplementation or restriction of drinking water. The direct ion-selective electrode measurement was useful for diagnosing pseudohyponatremia.
    Language English
    Publishing date 2023-04-16
    Publishing country England
    Document type Case Reports
    ZDB-ID 2666110-X
    ISSN 2213-0071
    ISSN 2213-0071
    DOI 10.1016/j.rmcr.2023.101854
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Early growth response 1 as a podocyte injury marker in human glomerular diseases.

    Okabe, Masahiro / Koike, Kentaro / Yamamoto, Izumi / Tsuboi, Nobuo / Matsusaka, Taiji / Yokoo, Takashi

    Clinical kidney journal

    2023  Volume 17, Issue 1, Page(s) sfad289

    Abstract: Background: In human glomerular diseases, visualizing podocyte injury is desirable since podocytes do not regenerate and podocyte injury leads to podocyte loss. Herein, we investigated the utility of immunostaining for early growth response 1 (EGR1), ... ...

    Abstract Background: In human glomerular diseases, visualizing podocyte injury is desirable since podocytes do not regenerate and podocyte injury leads to podocyte loss. Herein, we investigated the utility of immunostaining for early growth response 1 (EGR1), which is expressed in injured podocytes from the early stages of injury in animal experiments, as a podocyte injury marker in human glomerular diseases.
    Methods: This study included 102 patients with biopsy-proven glomerular diseases between 2018 and 2021. The proportion of EGR1 expression in podocytes (%EGR1pod) was analyzed in relation to clinical and histopathological features, including glomerular and urinary podocyte-specific markers.
    Results: %EGR1pod correlated significantly with the urinary protein:creatinine ratio, urinary nephrin and podocin mRNA levels, and glomerular podocin staining (rho = 0.361, 0.514, 0.487 and -0.417, respectively; adjusted
    Conclusions: Our findings indicate that EGR1 is a promising potential marker for identifying active early podocyte injury in human glomerular diseases.
    Language English
    Publishing date 2023-11-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2655800-2
    ISSN 2048-8513 ; 2048-8505
    ISSN (online) 2048-8513
    ISSN 2048-8505
    DOI 10.1093/ckj/sfad289
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Challenges Posed by the Banff Classification: Diagnosis and Treatment of Chronic Active T-Cell-Mediated Rejection.

    Yamamoto, Izumi / Kawabe, Mayuko / Hayashi, Ayaka / Kobayashi, Akimitsu / Yamamoto, Hiroyasu / Yokoo, Takashi

    Nephron

    2023  Volume 147 Suppl 1, Page(s) 74–79

    Abstract: The three primary sites of acute T-cell-mediated rejection (TCMR) in transplanted kidneys are the tubular epithelial cells, interstitium, and the vascular endothelial cells. The pathology of acute lesions is characterized by inflammatory cell ... ...

    Abstract The three primary sites of acute T-cell-mediated rejection (TCMR) in transplanted kidneys are the tubular epithelial cells, interstitium, and the vascular endothelial cells. The pathology of acute lesions is characterized by inflammatory cell infiltration; the final diagnosis suggested by the Banff 2019 classification is guided by grading of tubulitis (the t score), interstitial inflammation (the i score), and endarteritis (the v score). Consistent major issues when using the Banff classification are the etiological classifications of interstitial fibrosis and tubular atrophy (IFTA). From 2015 to 2019, technological advances (i.e., genetic analysis in paraffin sections) increased our understanding of IFTA status in patients with smoldering acute TCMR and the roles played by inflammatory cell infiltration (the i-IFTA score) and tubulitis (the t-IFTA score) in IFTA. These two scores were introduced when establishing the diagnostic criteria for chronic active TCMR. Despite the increase in complexity and the lack of a consensus treatment for chronic active TCMR, the Banff classification may evolve as new techniques (i.e., genetic analysis in paraffin sections and deep learning of renal pathology) are introduced. The Banff conference proceeded as follows. First, lesions were defined. Next, working groups were established to better understand the lesions and to derive better classification methods. Finally, the new Banff classification was developed. This approach will continue to evolve; the Banff classification will become a very useful diagnostic standard. This paper overviews the history of TCMR diagnosis using the Banff classification, and the clinical importance, treatment, and prospects for acute and chronic active TCMR.
    MeSH term(s) Humans ; Kidney Transplantation ; T-Lymphocytes ; Endothelial Cells ; Paraffin ; Kidney/pathology ; Kidney Diseases/pathology ; Graft Rejection/etiology ; Biopsy
    Chemical Substances Paraffin (8002-74-2)
    Language English
    Publishing date 2023-03-16
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 207121-6
    ISSN 2235-3186 ; 1423-0186 ; 1660-8151 ; 0028-2766
    ISSN (online) 2235-3186 ; 1423-0186
    ISSN 1660-8151 ; 0028-2766
    DOI 10.1159/000530158
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Higher Soluble ACE2 Levels and Increased Risk of Infection-Related Hospitalization in Patients on Maintenance Hemodialysis.

    Kawabe, Mayuko / Nakashima, Akio / Yamamoto, Izumi / Ohkido, Ichiro / Yokoo, Takashi / Urashima, Mitsuyoshi

    Frontiers in medicine

    2022  Volume 9, Page(s) 791284

    Abstract: Background: Angiotensin-converting enzyme 2 (ACE2) works as an endogenous counter-regulator of the renin-angiotensin system, which has pivotal roles in preventing both cardiovascular disease (CVD) and inflammation. In general populations, higher plasma ... ...

    Abstract Background: Angiotensin-converting enzyme 2 (ACE2) works as an endogenous counter-regulator of the renin-angiotensin system, which has pivotal roles in preventing both cardiovascular disease (CVD) and inflammation. In general populations, higher plasma soluble ACE2 levels were reported to be associated with increased risks of all-cause death and major CVD. Because infections are fatal in patients on maintenance hemodialysis, we aimed to explore whether soluble ACE2 levels are associated with an increased risk of infection-related hospitalization in these patients.
    Methods: Using data from a prospective, multicenter, cohort study conducted in Tokyo, Japan, we performed a
    Results: The soluble ACE2 level (median, 0.16 ng/ml; interquartile range, 0.07-0.57 ng/ml) showed a weak negative association with age. During a median follow-up of 39 months, 106 patients (14.6%) were hospitalized with infectious diseases. Compared with the lower half of soluble ACE2 levels, the higher half was associated with an increased risk of infection-related hospitalization (hazard ratio, 1.57; 95% confidence interval, 1.02-2.41) with adjustment by other risk factors. On the other hand, there were no significant associations between soluble ACE2 and risks of all-cause death and CVD.
    Conclusion: Higher soluble ACE2 levels may associate with an increased risk of infection-related hospitalization in patients on maintenance hemodialysis.
    Language English
    Publishing date 2022-01-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2775999-4
    ISSN 2296-858X
    ISSN 2296-858X
    DOI 10.3389/fmed.2022.791284
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Marked Metabolic Acidosis Due to a Transverse Stoma after Urethroplasty for Congenital Epispadias.

    Yamauchi, Mariko / Kamejima, Sahoko / Ueda, Risa / Nakashima, Akio / Urabe, Fumihiko / Yamamoto, Izumi / Ohkido, Ichiro / Yokoo, Takashi

    Internal medicine (Tokyo, Japan)

    2023  Volume 62, Issue 24, Page(s) 3663–3668

    Abstract: A 58-year-old woman was admitted to our hospital. At 10 years old, she had undergone bilateral uretero-sigmoid anastomosis for congenital epispadias, and at 57 years old, she had received transverse colostomy. Biochemical tests showed marked metabolic ... ...

    Abstract A 58-year-old woman was admitted to our hospital. At 10 years old, she had undergone bilateral uretero-sigmoid anastomosis for congenital epispadias, and at 57 years old, she had received transverse colostomy. Biochemical tests showed marked metabolic acidosis. Computed tomography showed urine stagnation in the sigmoid colon, leading to a diagnosis of metabolic acidosis associated with transverse stoma after bilateral uretero-sigmoid anastomosis. Her bone mineral density was below normal, and the bone metabolic marker levels were high, indicating high-turnover osteoporosis. Both metabolic acidosis and bone metabolism were stabilized by treatment with a transanal urinary catheter, sodium bicarbonate, and vitamin D.
    MeSH term(s) Female ; Humans ; Middle Aged ; Child ; Epispadias/complications ; Acidosis/complications ; Acidosis/metabolism ; Bone Density ; Colon, Sigmoid/surgery ; Osteoporosis/complications
    Language English
    Publishing date 2023-05-10
    Publishing country Japan
    Document type Case Reports ; Journal Article
    ZDB-ID 32371-8
    ISSN 1349-7235 ; 0021-5120 ; 0918-2918
    ISSN (online) 1349-7235
    ISSN 0021-5120 ; 0918-2918
    DOI 10.2169/internalmedicine.1523-22
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Active vitamin D analog and SARS-CoV-2 IgG after BNT162b2 vaccination in patients with hemodialysis.

    Nakashima, Akio / Yamamoto, Izumi / Kobayashi, Arisa / Kimura, Keita / Yaginuma, Tatsuhiro / Nishio, Shinichiro / Kato, Kazuhiko / Kawai, Rena / Horino, Tetsuya / Ohkido, Ichiro / Yokoo, Takashi

    Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy

    2024  

    Abstract: Introduction: Vaccination is the effective strategy for coronavirus disease 2019 (COVID-19). However, few studies have investigated the association between severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immunoglobulin (Ig)G and vitamin D.!# ...

    Abstract Introduction: Vaccination is the effective strategy for coronavirus disease 2019 (COVID-19). However, few studies have investigated the association between severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immunoglobulin (Ig)G and vitamin D.
    Methods: This study aimed to investigate the association between SARS-CoV-2 IgG and active vitamin D analogs in hemodialysis patients. Blood samples were collected four times: before vaccination and 30, 60, and 90 days after vaccination, BNT162b2 (Pfizer©).
    Results: A total of 418 patients were enrolled. The mean age was 71.1 ± 12 years. Almost two thirds of the patients were prescribed active vitamin D analogs. The distribution of SARS-CoV-2 IgG before vaccination was 235 (93-454) AU/mL. After multiple regression analyses, active vitamin D analog use was found to be associated with higher SARS-CoV-2 IgG levels from prevaccination to 90 days postvaccination.
    Conclusion: This study demonstrated an association between higher SARS-CoV-2 IgG and active vitamin D analog use in hemodialysis patients.
    Clinical trial registration: The study information was registered in the UMIN-CTR (UMIN 000046906).
    Language English
    Publishing date 2024-03-19
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2119809-3
    ISSN 1744-9987 ; 1091-6660 ; 1744-9979
    ISSN (online) 1744-9987
    ISSN 1091-6660 ; 1744-9979
    DOI 10.1111/1744-9987.14121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: CASE REPORT: Serial Cases of False-Positive Flow-Cytometry T Cell Crossmatch Associated With Anti-Blood Type Antibodies in Patients Undergoing ABO-Incompatible Kidney Transplantation.

    Hayashi, Ayaka / Yamamoto, Izumi / Kawabe, Mayuko / Kobayashi, Akimitsu / Ito, Makoto / Hotta, Kiyohiko / Shinohara, Nobuo / Tasaki, Tetsunori / Yokoo, Takashi / Iwami, Daiki

    Frontiers in immunology

    2022  Volume 13, Page(s) 862652

    Abstract: Background: A positive flow-cytometry T cell crossmatch (FTXM) has important prognostic implications, even when the complement-dependent cytotoxicity crossmatch is negative. Recent studies have shown that ABO incompatibility is associated with positive ... ...

    Abstract Background: A positive flow-cytometry T cell crossmatch (FTXM) has important prognostic implications, even when the complement-dependent cytotoxicity crossmatch is negative. Recent studies have shown that ABO incompatibility is associated with positive FTXM, but the underlying mechanism remains poorly understood.
    Cases: In five ABO blood type O recipients of kidneys from wives with type B, FTXM was positive but complement-dependent cytotoxicity crossmatch was negative. Application of a solid-phase technique (LABScreen) revealed no case with antibodies to donor-specific human leukocyte antigen. After removal of type B antibodies from patient sera, FTXM was negative for all five patients. In one tested case, the eluate prepared from the donor's T lymphocyte agglutinated only type B red blood cells, implying the existence of blood type B substances on donor T lymphocytes.
    Discussion: False-positive FTXM reflects blood type B substrates bound to T lymphocytes. Repeat FTXM after incubation with donor-type red blood cells (to adsorb anti-ABO antibodies) was negative. This phenomenon explains the discrepancy between FTXM and solid-phase bead assays. Demonstration of type B substances on donor T lymphocytes is necessary before absolute test validity is confirmed.
    Conclusion: False-positive FTXM may be associated with type B antibodies bound to T lymphocytes when a blood type O recipient receives tissue from a type B donor. This phenomenon explains the false-positive FTXM observed in the setting of ABO-incompatible kidney transplantation.
    MeSH term(s) ABO Blood-Group System ; Anemia, Hemolytic, Autoimmune ; Antibodies ; HLA Antigens ; Histocompatibility Testing/methods ; Humans ; Kidney Transplantation/adverse effects ; Kidney Transplantation/methods ; T-Lymphocytes
    Chemical Substances ABO Blood-Group System ; Antibodies ; HLA Antigens
    Language English
    Publishing date 2022-03-10
    Publishing country Switzerland
    Document type Case Reports
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2022.862652
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Subcutaneous Emphysema Related to Dental Treatment: A Case Series.

    Shimizu, Rieko / Sukegawa, Shintaro / Sukegawa, Yuka / Hasegawa, Kazuaki / Ono, Sawako / Fujimura, Ai / Yamamoto, Izumi / Ibaragi, Soichiro / Sasaki, Akira / Furuki, Yoshihiko

    Healthcare (Basel, Switzerland)

    2022  Volume 10, Issue 2

    Abstract: Cervicofacial subcutaneous emphysema (SE) is primarily caused by dental treatment introducing gas into the subcutaneous tissue. Air rapidly dissects into the subcutaneous tissue with face and neck swelling, leading to respiratory distress, patient ... ...

    Abstract Cervicofacial subcutaneous emphysema (SE) is primarily caused by dental treatment introducing gas into the subcutaneous tissue. Air rapidly dissects into the subcutaneous tissue with face and neck swelling, leading to respiratory distress, patient discomfort, and chest pain. Computed tomography (CT) can detect spreading SE patterns. However, the true volume of SE and the degree of air changes in the body over time remain unknown. We evaluated the healing process of SE and the temporal changes in the volume of emphysema in three cases detected using our hospital's electronic health record systems based on inclusion and exclusion criteria over the past 10 years, with CT and three-dimensional (3D) images. The first case was a 46-year-old woman who presented with complaints of swelling from her right eyelid to the neck and clavicles, pain on swallowing, respiratory distress, and hoarseness. The second case was a 35-year-old man who presented with complaints of swelling over the face. The third case was a 36-year-old man who presented with complaints of swelling from the left cheek to the neck. CT revealed SE and pneumomediastinum in all cases. All the patients were administered an antibacterial drug. The CT and 3D images showed an improvement in emphysema 3 days after the onset, with more than half of the volume reduction in emphysema. This made it possible to evaluate the changes in the air content of SE. Observation with CT until the healing process of SE is completed is crucial, and 3D images also help evaluate changes over time.
    Language English
    Publishing date 2022-02-01
    Publishing country Switzerland
    Document type Case Reports
    ZDB-ID 2721009-1
    ISSN 2227-9032
    ISSN 2227-9032
    DOI 10.3390/healthcare10020290
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  10. Article ; Online: Hypercalcemia caused by comorbid parathyroid adenoma and pulmonary tuberculosis.

    Kamejima, Sahoko / Yamamoto, Izumi / Kobayashi, Arisa / Nakashima, Akio / Uchiyama, Taketo / Ohkido, Ichiro / Yokoo, Takashi

    CEN case reports

    2020  Volume 10, Issue 1, Page(s) 1–5

    Abstract: Hypercalcemia is usually secondary to one etiology, although two coexisting etiologies can rarely cause hypercalcemia. Here, we report a 47-year-old woman with hypercalcemia caused by comorbid parathyroid adenoma and pulmonary tuberculosis. Primary ... ...

    Abstract Hypercalcemia is usually secondary to one etiology, although two coexisting etiologies can rarely cause hypercalcemia. Here, we report a 47-year-old woman with hypercalcemia caused by comorbid parathyroid adenoma and pulmonary tuberculosis. Primary hyperparathyroidism is the most common cause of hypercalcemia. Tuberculosis is a rare cause of hypercalcemia, but Japan continues to have an intermediate tuberculosis burden. Therefore, tuberculosis should be considered as a cause of hypercalcemia in Japan. Patients with tuberculosis are often asymptomatic, making the diagnosis difficult. In the previous cases in which these diseases coexisted, one disease was diagnosed after treatment of the other. In our case, the very high 1,25-dihydroxyvitamin D level (162 pg/mL) helped us to diagnose asymptomatic tuberculosis and both diseases were diagnosed promptly. It is necessary to consider comorbidities, including tuberculosis in a case with a very high 1,25-dihydroxyvitamin D level. We report a valuable case in which the early diagnosis and treatment of tuberculosis and primary hyperparathyroidism prevented the spread of tuberculosis.
    MeSH term(s) Antitubercular Agents/therapeutic use ; Bone Density/drug effects ; Comorbidity ; Early Diagnosis ; Female ; Humans ; Hypercalcemia/diagnosis ; Hypercalcemia/etiology ; Hyperparathyroidism, Primary/diagnosis ; Hyperparathyroidism, Primary/drug therapy ; Middle Aged ; Parathyroid Neoplasms/complications ; Parathyroid Neoplasms/diagnosis ; Parathyroid Neoplasms/surgery ; Parathyroidectomy/methods ; Treatment Outcome ; Tuberculosis, Pulmonary/complications ; Tuberculosis, Pulmonary/diagnosis ; Tuberculosis, Pulmonary/drug therapy ; Vitamin D/analogs & derivatives ; Vitamin D/blood
    Chemical Substances Antitubercular Agents ; Vitamin D (1406-16-2) ; 1,25-dihydroxyvitamin D (66772-14-3)
    Language English
    Publishing date 2020-07-06
    Publishing country Japan
    Document type Case Reports ; Journal Article
    ZDB-ID 2660492-9
    ISSN 2192-4449 ; 2192-4449
    ISSN (online) 2192-4449
    ISSN 2192-4449
    DOI 10.1007/s13730-020-00509-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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