Publications by authors named "Ik Jin Yun"

Purpose: The cytotoxic T-lymphocyte-associated protein 4 () is involved in the progression of various cancers, but its biological roles in breast cancer (BRCA) remain unclear. Therefore, we performed a systematic multiomic analysis to expound on the prognostic value and underlying mechanism of in BRCA.

Methods: We assessed the effect of expression on BRCA using a variety of bioinformatics platforms, including Oncomine, GEPIA, UALCAN, PrognoScan database, Kaplan-Meier plotter, and R2: Kaplan-Meier scanner.

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Because there is a shortage of donor kidneys, researchers are exploring the possibility of using genetically modified pig kidneys for transplantation. Approaches involving knockout of carbohydrate genes or knockin of protective proteins have been attempted to determine the best gene modifications. In this study, we utilized ; and ; pigs for transplantation in nonhuman primates (NHPs).

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Cardiac xenotransplantation is the potential treatment for end-stage heart failure, but the allogenic organ supply needs to catch up to clinical demand. Therefore, genetically-modified porcine heart xenotransplantation could be a potential alternative. So far, pig-to-monkey heart xenografts have been studied using multi-transgenic pigs, indicating various survival periods.

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Article Synopsis
  • In South Korea, recent pig-to-primate kidney transplantation trials have shown initial results that are not yet sufficient for clinical application, with 30 surgeries conducted since 2011 at Konkuk University Hospital.
  • Researchers used genetically modified pigs to create organs and administered various immunosuppressants to prevent rejection in cynomolgus monkey recipients.
  • Although the average survival of the transplanted kidneys was 50 days, these results are noted to be the best recorded in the country, with ongoing efforts to enhance the outcomes and move towards clinical trials.
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Article Synopsis
  • The study examines the graft survival rates of full-thickness versus lamellar corneal xenotransplantation (XTP) using genetically engineered pigs in monkey recipients.
  • Results showed that lamellar XTP had significantly longer graft survival times compared to full-thickness XTP, with survival times of over 463 days versus 21 days, though not as high as previous lamellar studies.
  • The findings suggest that lamellar XTP avoids certain surgical complications associated with full-thickness XTP, but further research is needed to enhance graft survival rates and explore the impacts of different transgenic types.
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Purpose: The prognostic value of vitamin D receptor gene () expression in breast cancer development is unclear. Here, we aimed to investigate whether expression can be used as a prognostic indicator of breast cancer.

Methods: We used various public bioinformatics platforms: Oncomine, GEPIA, UALCAN, Kaplan-Meier plotter, UCSC XENA, bc-GenExMiner, WebGestalt, and STRING database.

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After attaining a qualified medical capacity in organ transplantation, Korea has been struggling to increase the number of deceased organ transplants to reach self-sufficiency. As one of these efforts, Korea revised the organ transplantation law in 2010 by adding three articles the mandatory reporting based on the recommendation of the 3rd Global Consultation on Organ Transplantation of Madrid in 2010. Along with the new constitution, considerable efforts have been initiated to upgrade the deceased organ transplantation system while maintaining the virtues of fairness, justice, and transparency.

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BRCA1/2 are breast cancer susceptibility genes that are involved in DNA repair and transcriptional control. They are dysregulated in breast cancer, making them attractive therapeutic targets. Here, we performed a systematic multiomics analysis to expound BRCA1/2 functions as prognostic biomarkers in breast cancer.

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Background: To understand changes in biological responses in nonhuman primate (NHP) recipients of xenotransplantation (XTP), we retrospectively investigated chronological changes in cytokine profiles of NHP recipients after solid-organ XTP.

Methods: Plasma samples were collected from 7 NHP recipients of pig heart or kidney XTP with α-1,3-galactosyltransferase gene knockout (GTKO) under anti-CD154-based immune suppression at the following time points: immediately before; 2 hours, 3 days, and 7 days after XTP; and weekly thereafter until the graft failed. The plasma levels of the following cytokines were measured: interleukin (IL)-1α, IL-1β, IL-6, IL-12p70, IL-8, IL-10, IL-15, tumor necrosis factor, interferon gamma (IFN-γ), D-dimer, C3a, and histone-complexed DNA fragments.

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Purpose: Obesity strongly affects the prognosis of various malignancies, including breast cancer. Leptin (LEP) may be associated with obesity and breast cancer prognosis. The purpose of our study was to determine the prognostic value of LEP in breast cancer.

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Porcine heart xenotransplantation is a potential treatment for patients with end-stage heart failure. To understand molecular mechanisms of graft rejection after heart transplantation, we transplanted a 31-day-old (GTKO) porcine heart to a five-year-old cynomolgus monkey. Histological and transcriptome analyses were conducted on xenografted cardiac tissue at rejection (nine days after transplantation).

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Prostaglandin-endoperoxide synthase-2 () plays a pivotal role in inflammation and carcinogenesis in human breast cancer. Our aim of the study is to find the prognostic value of in breast cancer. We conducted a multiomic analysis to determine whether functions as a prognostic biomarker in human breast cancer.

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Introduction: Prostaglandin E (PGE) administered to patients in the immediate post-transplant period has been known to reduce ischemic reperfusion injuries (IRIs), but the effect on IRI of PGE administered to the donor is unknown. The purpose of this study was to determine the effect on IRI of PGE injected into donor rats during heterotopic heart transplantation.

Methods: Genetically identical male Sprague Dawley rats with a body weight of 300-320 g at 8-9 weeks of age were used for the study.

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Pigs are used as potential donor animals for xenotransplantation. However, porcine endogenous retrovirus (PERV), shown to infect both human and non-human primate (NHP) cells in vitro, presents a risk of transmission to humans in xenotransplantation. In this study, we analyzed PERV transmission in various organs after pig-to-NHP xenotransplantation.

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Objective: The objective of this study was to evaluate the effectiveness and safety of endovenous cyanoacrylate closure (CAC) of incompetent great saphenous vein (GSV) and to assess the regression of varicose vein following CAC without a concomitant procedure.

Methods: A total of 63 limbs in 48 patients treated with CAC because of an incompetent GSV between December 2016 and November 2017 were retrospectively evaluated. In five limbs, incompetent GSV and small saphenous vein were treated simultaneously in the same session.

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Most studies of xenografts have been carried out with complex immunosuppressive regimens to prevent immune rejection; however, such treatments may be fatal owing to unknown causes. Here, we performed immune molecular profiling following anti-CD154 monoclonal antibody (mAb) treatment in heterotopic abdominal cardiac xenografts from α-1,3-galactosyltransferase-knockout pigs into cynomolgus monkeys to elucidate the mechanisms mediating the undesirable fatal side effects of immunosuppressive agents. Blood samples were collected from healthy monkeys as control and then at 2 days after xenograft transplantation and just before humane euthanasia; 94 genes related to the immune system were analyzed.

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Background: Malnutrition is associated with many adverse clinical outcomes. The present study aimed to identify the prevalence of malnutrition in hospitalized patients in Korea, evaluate the association between malnutrition and clinical outcomes, and ascertain the risk factors of malnutrition.

Methods: A multicenter cross-sectional study was performed with 300 patients recruited from among the patients admitted in 25 hospitals on January 6, 2014.

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Effective immunosuppression strategies and genetically modified animals have been used to prevent hyperacute and acute xenograft rejection; however, the underlying mechanisms remain unknown. In this study, we evaluated the expression of a comprehensive set of immune system-related genes (89 genes, including five housekeeping genes) in the blood of cynomolgus monkeys (~5 yr old) used as graft recipients, before and after the xenografting of the islets and heart from single and double α-1,3-galactosyltransferase (GalT) knockout (KO) pigs (<6 weeks old). The immunosuppressive regimen included administration of cobra venom factor, anti-thymocyte globulin, rituximab, and anti-CD154 monoclonal antibodies to recipients before and after grafting.

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