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Now showing items 1 - 8 of 8

  • C1q nephropathy in adults is a form of focal segmental glomerulosclerosis in terms of clinical characteristics

    Kim, Kipyo   Son, Hyung-Eun   Ryu, Ji-Young   Lee, Hajeong   Han, Seung Hyeok   Ryu, Dong-Ryeol   Paik, Jin Ho   Kim, Sejoong   Na, Ki Young   Chae, Dong-Wan   Chin, Ho Jun   Oh, Se Won   Cravedi, Paolo  

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  • Inevitable isolation and the change of stress markers in hemodialysis patients during the 2015 MERS-CoV outbreak in Korea

    Kim, Yang Gyun   Moon, Haena   Kim, Se-Yun   Lee, Yu-Ho   Jeong, Da-Wun   Kim, Kipyo   Moon, Ju Young   Lee, Young-Ki   Cho, Ajin   Lee, Hong-Seock   Park, Hayne Cho   Lee, Sang-Ho  

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  • Fatal Invasive Pulmonary Aspergillosis after Combined Induction with Rituximab and Antithymocyte Globulin for Kidney Transplantation in a Sensitized Recipient, and Early Rejection Therapy with Plasmapheresis and Low-dose Immunoglobulin

    Jeong, Da Wun   Lee, Sang-Ho   Moon, Ju-Young   Kim, Yang-Gyun   Lee, Yu Ho   Kim, Kipyo   Park, Hochul   Joo, Sun Hyung  

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  • Real-Time Monte Carlo Optimization on FPGA for the Efficient and Reliable Message Chain Structure

    Lee, Heoncheol   Kim, Kipyo  

    This paper addresses the real-time optimization problem to find the most efficient and reliable message chain structure in data communications based on half-duplex command-response protocols such as MIL-STD-1553B communication systems. This paper proposes a real-time Monte Carlo optimization method implemented on field programmable gate arrays (FPGA) which can not only be conducted very quickly but also avoid the conflicts with other tasks on a central processing unit (CPU). Evaluation results showed that the proposed method can consistently find the optimal message chain structure within a quite small and deterministic time, which was much faster than the conventional Monte Carlo optimization method on a CPU.
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  • Inevitable isolation and the change of stress markers in hemodialysis patients during the 2015 MERS-CoV outbreak in Korea

    Kim, Yang Gyun   Moon, Haena   Kim, Se-Yun   Lee, Yu-Ho   Jeong, Da-Wun   Kim, Kipyo   Moon, Ju Young   Lee, Young-Ki   Cho, Ajin   Lee, Hong-Seock   Park, Hayne Cho   Lee, Sang-Ho  

    During the outbreak of Middle East respiratory syndrome coronavirus(MERS-CoV) in 2015, one hemodialysis patient was infected with MERS-CoV, and the remaining hemodialysis(HD) patients (n =3D 83) and medical staff (n =3D 12) had to undergo dialysis treatment in an isolated environment. This study was performed to investigate the effects of stress caused by dialysis treatment under isolation. Plasma samples from the HD patients and medical staff were collected at the time of isolation(M0), the following month(M1), and three months after isolation(M3). Parameters for stress included circulating cell-free genomic DNA(ccf-gDNA), circulating cell-free mitochondria DNA(ccf-mtDNA), and pentraxin-3(PTX-3). Decreased values of Hct, kt/v and ca x p were recovered after the end of two weeks of isolation. The levels of ccf-gDNA and ccf-mtDNA were the highest at M0 and decreased gradually in both HD patients and the medical staff. The normalization of ccf-g DNA and ccf-mtDNA was significantly delayed in HD patients compared with the response in the medical staff. PTX-3 increased only in HD patients and was highest at MO, and it then gradually decreased. Medical isolation and subnormal quality of care during the MERS outbreak caused extreme stress in HD patients. Plasma cell-free DNA and PTX-3 seems to be good indicators of stress and quality of care in HD patients.
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  • C1q nephropathy in adults is a form of focal segmental glomerulosclerosis in terms of clinical characteristics

    Kim, Kipyo   Son, Hyung-Eun   Ryu, Ji-Young   Lee, Hajeong   Han, Seung Hyeok   Ryu, Dong-Ryeol   Paik, Jin Ho   Kim, Sejoong   Na, Ki Young   Chae, Dong-Wan   Chin, Ho Jun   Oh, Se Won  

    Although C1q nephropathy (C1qN) was introduced three decades ago, the clinical significance and renal outcomes of C1qN remain unclear. This study aimed to evaluate the clinical characteristics of C1qN, including renal outcomes, by performing a matched comparison within a multicenter cohort. We enrolled 6,413 adult patients who underwent kidney biopsy between January 2000 and January 2018 at three tertiary hospitals in Korea. We compared the clinical characteristics of 23 patients with C1qN with those of patients with focal segmental glomerulosclerosis (FSGS) or minimal change disease (MCD) who were matched by age, sex, diabetic status, and a period of biopsy. Histological and clinical parameters in patients with C1qN were also evaluated according to the different pathological phenotypes. For a mean follow-up period of 92 months, 4 patients with C1qN (17.4%) developed end-stage renal disease (ESRD). None of the matched patients with MCD had ESRD, but 7 (30.4%) of patients with FSGS progressed to ESRD, which was not different from that of C1qN patients (p =3D 0.491). Laboratory and pathological findings, except segmental glomerulosclerosis, were not notably different between FSGS and C1qN. The presence of segmental glomerulosclerosis, mesangial hypercellularity, and podocyte effacement did not affect both the short-and long-term renal outcomes in patients with C1qN. Our study showed that the renal outcomes of C1qN are comparable with those of FSGS, and not with MCD. Specific pathological findings, including segmental glomerulosclerosis in C1qN, were not associated with renal outcomes, which may suggest homogeneity in the clinical features of C1qN.
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  • Clinical relevance of cell-free mitochondrial DNA during the early postoperative period in kidney transplant recipients

    Kim, Kipyo   Moon, Haena   Lee, Yu Ho   Seo, Jung-Woo   Kim, Yang Gyun   Moon, Ju-Young   Kim, Jin Sug   Jeong, Kyung-Hwan   Lee, Tae Won   Ihm, Chun-Gyoo  

    Recent studies indicate that urinary mitochondrial DNA (mtDNA) is predictive of ischemic AKI and is related to delayed graft function (DGF) in renal transplantation. Nevertheless, the clinical implications and prognostic value of urinary mtDNA in kidney transplantation remain undetermined. Here, we aimed to evaluate the associations between cell-free mtDNA and clinical parameters, including pathological findings in allograft biopsy and post-transplant renal function. A total of 85 renal transplant recipients were enrolled, and blood and urine samples were collected at a median of 17 days after transplantation. Cell-free nuclear and mtDNA levels were measured by quantitative polymerase chain reaction for LPL and ND1 genes. Urinary cell-free mtDNA levels were significantly higher in patients with DGF (P < 0.001) and cases of deceased donor transplantation (P < 0.001). The subjects with acute rejection showed higher urinary mtDNA levels than those without abnormalities (P =3D 0.043). In addition, allograft functions at 9- and 12-month post-transplantation were significantly different between tertile groups of mtDNA independent of the presence of DGF or acute rejection, showing significantly better graft outcome in the lowest tertile group. Urinary cell-free mtDNA levels during the early post-transplant period are significantly associated with DGF, acute rejection in graft biopsy, and short-term post-transplant renal function.
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  • Kidney on chips.

    Lee, Jeonghwan   Kim, Kipyo   Kim, Sejoong  

    Kidney tubule-on-a-chip has been developed since 2001. Drug toxicity and pharmacokinetic models using kidney tubule-on-a-chip devices are already available. Experimental models for other causes of acute kidney injury such as ischemia or infection will be available in the near future. Recently, glomerulus-on-a-chip was introduced using induced pluripotent stem cells. It is a far advanced model using the glomerulus structure. Its applications are still challenging but promising since patients with chronic kidney disease are steadily increasing with the increased prevalence of diabetes, hypertension, and old age. Glomerulus-on-a-chip may show diagnostic or therapeutic evidence to solve the question on how we could manage chronic kidney diseases in the clinical situation. We will deal with an updated technology of microfluidic organ-on-a-chip in the nephrological field and future expectations. =C2=A9 2018 Elsevier Inc. All rights reserved.
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