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Search Results: 1 - 10 of 646 matches for " Yoko Kikumoto "
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Suppression of Adiponectin by Aberrantly Glycosylated IgA1 in Glomerular Mesangial Cells In Vitro and In Vivo
Tatsuyuki Inoue, Hitoshi Sugiyama, Masashi Kitagawa, Keiichi Takiue, Hiroshi Morinaga, Ayu Ogawa, Yoko Kikumoto, Shinji Kitamura, Yohei Maeshima, Hirofumi Makino
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033965
Abstract: The pathogenesis of IgA nephropathy (IgAN) may be associated with the mesangial deposition of aberrantly glycosylated IgA1. To identify mediators affected by aberrantly glycosylated IgA1 in cultured human mesangial cells (HMCs), we generated enzymatically modified desialylated and degalactosylated (deSial/deGal) IgA1. The state of deglycosylated IgA1 was confirmed by lectin binding to Helix aspersa (HAA) and Sambucus nigra (SNA). In the cytokine array analysis, 52 proteins were upregulated and 34 were downregulated in HMCs after stimulation with deSial/deGal IgA1. Among them, the secretion of adiponectin was suppressed in HMCs after stimulation with deSial/deGal IgA1. HMCs expressed mRNAs for adiponectin and its type 1 receptor, but not the type 2 receptor. Moreover, we revealed a downregulation of adiponectin expression in the glomeruli of renal biopsy specimens from patients with IgAN compared to those with lupus nephritis. We also demonstrated that aberrantly glycosylated IgA1 was deposited in the mesangium of patients with IgAN by dual staining of HAA and IgA. Moreover, the urinary HAA/SNA ratio of lectin binding was significantly higher in IgAN compared to other kidney diseases. Since adiponectin has anti-inflammatory effects, including the inhibition of adhesion molecules and cytokines, these data suggest that the local suppression of this adipokine by aberrantly glycosylated IgA1 could be involved in the regulation of glomerular inflammation and sclerosis in IgAN.
Acatalasemic mice are mildly susceptible to adriamycin nephropathy and exhibit increased albuminuria and glomerulosclerosis
Keiichi Takiue, Hitoshi Sugiyama, Tatsuyuki Inoue, Hiroshi Morinaga, Yoko Kikumoto, Masashi Kitagawa, Shinji Kitamura, Yohei Maeshima, Da-Hong Wang, Noriyoshi Masuoka, Keiki Ogino, Hirofumi Makino
BMC Nephrology , 2012, DOI: 10.1186/1471-2369-13-14
Abstract: ADR was intravenously administered to both homozygous acatalasemic mutant mice (C3H/AnLCsbCsb) and control wild-type mice (C3H/AnLCsaCsa). The functional and morphological alterations of the kidneys, including albuminuria, renal function, podocytic, glomerular and tubulointerstitial injuries, and the activities of catalase were then compared between the two groups up to 8 weeks after disease induction. Moreover, the presence of a mutation of the toll-like receptor 4 (tlr4) gene, which was previously reported in the C3H/HeJ strain, was investigated in both groups.The ADR-treated mice developed significant albuminuria and glomerulosclerosis, and the degree of these conditions in the ADR-treated acatalasemic mice was higher than that in the wild-type mice. ADR induced progressive renal fibrosis, renal atrophy and lipid peroxide accumulation only in the acatalasemic mice. In addition, the level of catalase activity was significantly lower in the kidneys of the acatalasemic mice than in the wild-type mice during the experimental period. The catalase activity increased after ADR injection in wild-type mice, but the acatalasemic mice did not have the ability to increase their catalase activity under oxidative stress. The C3H/AnL strain was found to be negative for the tlr4 gene mutation.These data indicate that catalase deficiency plays an important role in the progression of renal injury in the ADR nephropathy model.The degree of oxidative stress and the severity of subsequent tissue injury may depend on an imbalance between the excessive production of reactive oxygen species and the antioxidant defense. The antioxidants include the enzymes superoxide dismutase (SOD), catalase, and glutathione peroxidase (GPX), which detoxify reactive oxygen species. Catalase (E.C.1.11.1.6) is a major enzyme that catalyzes the decomposition of hydrogen peroxide (H2O2) and plays a role in cellular antioxidant defense mechanisms [1]. The main reaction of catalase is the catalytic reaction (
A Decreased Level of Serum Soluble Klotho Is an Independent Biomarker Associated with Arterial Stiffness in Patients with Chronic Kidney Disease
Masashi Kitagawa, Hitoshi Sugiyama, Hiroshi Morinaga, Tatsuyuki Inoue, Keiichi Takiue, Ayu Ogawa, Toshio Yamanari, Yoko Kikumoto, Haruhito Adam Uchida, Shinji Kitamura, Yohei Maeshima, Kazufumi Nakamura, Hiroshi Ito, Hirofumi Makino
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0056695
Abstract: Background Klotho was originally identified in a mutant mouse strain unable to express the gene that consequently showed shortened life spans. In humans, low serum Klotho levels are related to the prevalence of cardiovascular diseases in community-dwelling adults. However, it is unclear whether the serum Klotho levels are associated with signs of vascular dysfunction such as arterial stiffness, a major determinant of prognosis, in human subjects with chronic kidney disease (CKD). Methods We determined the levels of serum soluble Klotho in 114 patients with CKD using ELISA and investigated the relationship between the level of Klotho and markers of CKD-mineral and bone disorder (CKD-MBD) and various types of vascular dysfunction, including flow-mediated dilatation, a marker of endothelial dysfunction, ankle-brachial pulse wave velocity (baPWV), a marker of arterial stiffness, intima-media thickness (IMT), a marker of atherosclerosis, and the aortic calcification index (ACI), a marker of vascular calcification. Results The serum Klotho level significantly correlated with the 1,25-dihydroxyvitamin D level and inversely correlated with the parathyroid hormone level and the fractional excretion of phosphate. There were significant decreases in serum Klotho in patients with arterial stiffness defined as baPWV≥1400 cm/sec, atherosclerosis defined as maximum IMT≥1.1 mm and vascular calcification scores of ACI>0%. The serum Klotho level was a significant determinant of arterial stiffness, but not endothelial dysfunction, atherosclerosis or vascular calcification, in the multivariate analysis in either metabolic model, the CKD model or the CKD-MBD model. The adjusted odds ratio of serum Klotho for the baPWV was 0.60 (p = 0.0075). Conclusions Decreases in the serum soluble Klotho levels are independently associated with signs of vascular dysfunction such as arterial stiffness in patients with CKD. Further research exploring whether therapeutic approaches to maintain or elevate the Klotho level could improve arterial stiffness in CKD patients is warranted.
Unrecognized States in the Former USSR and Kosovo: A Focus on Standing Armies  [PDF]
Yoko Hirose
Open Journal of Political Science (OJPS) , 2016, DOI: 10.4236/ojps.2016.61007
Abstract: The end of the Cold War and the collapse of the USSR and Yugoslavia result in a proliferation of unrecognized and weak states, which continue to exist today. This article considers the relationship between unrecognized states and the major powers, Russia and the United States, by focusing on the foreign military bases or standing armies of the latter. In addition, unrecognized states, their parent countries, and similar states have received significant merits and profits from being unrecognized states, and this situation has also helped the survival of unrecognized states. It is possible that unrecognized states can be understood as part of the global strategies of the two great powers and that these states have been maintained through a complex negotiation process that is designed to maintain the superpowers’ global influence.
Success Factors for Social Systems to Increase the Number of Organ Donations—From the Perspectives of Mechanisms and Organizational Behaviors  [PDF]
Yoko Uryuhara
International Journal of Clinical Medicine (IJCM) , 2018, DOI: 10.4236/ijcm.2018.92007
Abstract: Deceased organ donation is much less prominent in Japan than it is in Western and other Asian countries. Because a shortage of organ donation is a serious social issue in Japan, various solutions to the issue have been considered. Although it was believed that the most critical factor in the organ shortage was the absence of a well-established social system, no prior studies attempted to analyze the issue from the perspective of the mechanisms and organizational behaviors. To identify common success factors of increasing organ donation, we conducted a qualitative survey in 5 countries promoting organ donations on a national level and increasing the number of organ donations. We found several important common factors: 1) to change from an explicit consent system to a presumed consent system with establishment of an appropriate in-hospital system, 2) to increase the level of job satisfaction of healthcare professionals and help them generating better results, 3) to demonstrate managements’ leadership for all staff to realize the importance of organ donations, 4) to establish an environment where medical professionals engaged in organ donations can appreciate autonomous working styles, the recognition of the importance of the work. It is suggested that these successful factors are introduced into Japan with long-, mid-term strategy to enhance organ donation.
One-Dimensional Helical Homochiral Metal-Organic Framework Built from 2,2′-Dihydroxy-1,1′-binaphthyl-3,3′-dicarboxylic Acid
Koichi Tanaka,Yuki Kikumoto,Motoo Shiro
Polymers , 2011, DOI: 10.3390/polym3041866
Abstract: A homochiral metal-organic framework (MOF) based on enantiopure ( R)-2,2′-dihydroxy-1,1′-binaphthyl-3,3′-dicarboxylic acid was synthesized. X-ray crystal diffraction studies revealed that the MOF adopts a one-dimensional infinite right-handed helical tubular structure along the a-axis, which serves as a host for the inclusion of guest dimethylformamide (DMF) molecules.
Effect of thermal therapy using hot water bottles on brain natriuretic peptide in chronic hemodialysis patients  [PDF]
Yoko Uchiyama-Tanaka
Health (Health) , 2013, DOI: 10.4236/health.2013.52034
Abstract:

Introduction: The use of repeated thermal therapy for improving the symptoms of chronic heart failure (CHF) has been recently demonstrated. Usually, thermal therapy requires an infrared dry sauna. However, it is difficult for small clinics to acquire such an expensive and extensive system. The author assessed the efficacy of its substitution with hot water bottles. Moreover, there are no prior studies demonstrating the efficacy of thermal therapy in hemodialysis patients with chronic heart failure. Methods: The author evaluated plasma brain natriuretic peptide (BNP) levels in 98 hemodialysis patients in a clinic. A total of nine patients whose BNP levels were more than 500 pg/mL agreed to be enrolled in this study and received thermal therapy using hot water bottles. Results: Plasma BNP levels, a potential marker for CHF, tended to decrease (891 ± 448 pg/mL to 680 ± 339 pg/mL), but the difference was not significant (P = 0.0845). The oral temperature changed from 36.44± 0.45to 37.04± 0.48 (+0.597, P < 0.0001). No side effects were experienced during the therapy. Moreover, most patients had an improvement in their symptoms and the ability to perform activities of daily living. Conclusion: Thermal therapy using hot water bottles is very safe and tends to reduce plasma BNP levels in hemodialysis patients with CHF.

Longitudinal Evaluation Nocturnal Sleep Behaviors of Healthy and Well Developed Children Born Prematurely  [PDF]
Yoko Asaka, Satoshi Takada
Open Journal of Pediatrics (OJPed) , 2016, DOI: 10.4236/ojped.2016.61009
Abstract: The aim of the study is to examine nocturnal sleep measures of healthy and well developed pre-term infants by birth weight when they were averaged 15 corrected months and became elementary school children. Sleep measures were collected by actigraphs (Micro-mini RC, Ambulatory Monitoring Inc., New York, USA). Nocturnal sleep quality of children born as extremely low birth weight (ELBW) was significantly inferior with that of children born as very low birth weight (VLBW) at 15 corrected months [number of night waking: 6.0 (4.5 - 8.0), ELBW 8.5 (7.0 - 10.3) (Z = 2.47, p < 0.01), wake after sleep onset: VLBW 99.0 (73.0 - 115.0) min, ELBW 146.5 (94.8 - 171.3) min (Z = 2.89, p < 0.01)]. However, these measures did not show any significant differences by birth weight at second data collection period [number of night waking: VLBW 0.0 (0.0-1.0), ELBW 1.0 (0.0 - 2.5) (Z = —0.62, n.s.), wake after sleep onset: VLBW 16.0 (8.0 - 27.0) min, ELBW 15.0 (6.0 - 32.5) min (Z = 0.00, n.s.)]. It was assumed that nocturnal measures were affected by the birth weight at the age of 15 corrected months in ELBW infants, but could not predict the future sleep problems at this point.
Sleep Quality for Patients Receiving Noninvasive Positive Pressure Ventilation and Nasal High-Flow Oxygen Therapy in an ICU: Two Case Studies  [PDF]
Hiroaki Murata, Yoko Yamaguchi
Open Journal of Nursing (OJN) , 2018, DOI: 10.4236/ojn.2018.89045
Abstract: Aim: The purpose of this case study was to examine the sleep quality of patients receiving noninvasive positive pressure ventilation (NPPV) or nasal high-flow oxygen therapy (NHF) in an intensive care unit and to investigate what types of nursing support are offered to such patients. Methods: We examined one patient each for NPPV and NHF. Polysomnography (PSG), review of the patient charts, and semi-structured interviews were used to collect the data for analysis. Results: Patients treated with NPPV or NHF demonstrated a noticeable reduction in deep sleep, with most of their sleep being shallow. Their sleep patterns varied greatly from those of healthy individuals. These results suggest that, in addition to experiencing extremely fragmented sleep, sleep in these patients was more likely to be interrupted by nursing interventions, such as during auscultation of breath sounds. Furthermore, it was revealed that “anxiety or discomfort that accompanies the mask or air pressure” in patients treated with NPPV and “discomfort that accompanies the nasal cannula or NHF circuit” in patients treated with NHF may be primary causes of disrupted sleep. Our results suggest a need for nursing care aimed at improving sleep quality in patients treated with NPPV or NHF.
The therapeutic potential of synthetic human atrial natriuretic peptide in nephrotic syndrome: a randomized controlled trial
Kanzaki M,Wada J,Kikumoto Y,Akagi S
International Journal of Nephrology and Renovascular Disease , 2012,
Abstract: Motoko Kanzaki,1 Jun Wada,1 Yoko Kikumoto,1 Shigeru Akagi,1 Kazushi Nakao,3 Hitoshi Sugiyama,2 Hirofumi Makino11Department of Medicine and Clinical Science, 2Department of Chronic Kidney Disease and Peritoneal Dialysis, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan; 3Internal Medicine, Hiroshima City Hospital, Hiroshima, JapanBackground: In nephrotic syndrome, the combination of furosemide and albumin infusion is a standard regimen to treat systemic edema. The efficacy of synthetic human atrial natriuretic peptide (hANP) for nephrotic syndrome to ameliorate the systemic edema and retain renal functions has not been fully demonstrated.Trial design: We conducted a prospective, randomized, controlled, open-label clinical trial. Patients were randomly assigned by a stratified biased coin design.Methods: A total of 12 patients with nephrotic syndrome between the ages of 20 to 79 years were enrolled and randomly assigned to either the conventional (CON) group treated with furosemide and albumin, and hANP group, in which carperitide was administered in addition to the conventional therapies. The primary end points were: (1) the differences in serum creatinine levels, and (2) the reduction of total dosage of furosemide and albumin by the treatments of hANP. Secondary end points were body weight, systolic blood pressure, heart rate, serum protein, albumin, and urinary protein excretion.Results: A total of 13 patients were enrolled, and one patient was excluded due to severe pneumonia. In both hANP (n = 7) and CON (n = 5) groups, body weight was reduced after 2-week treatments. Serum creatinine levels at follow-up significantly increased compared with baseline. The increase in serum creatinine levels (Δ serum creatinine) was smaller in the hANP group compared with the CON group (P = 0.31). The serum uric acid, serum urea nitrogen, and urinary protein excretion were reduced in the hANP group, and increased in the CON group, though these differences were not statistically significant. The usage of hANP significantly reduced the total dosage of furosemide (P < 0.05) during the treatment periods. No adverse effects were observed.Conclusions: The concomitant use of synthetic hANP with conventional therapies is beneficial for reducing the dosage of loop diuretics, and the elevation of serum creatinine and uric acid may be avoided.Keywords: furosemide, generalized edema, human natriuretic peptide, nephrotic syndrome
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