12 results on '"You-Min Kim"'
Search Results
2. A case of vitamin D hydroxylation-deficient rickets type 1A caused by 2 novel pathogenic variants in gene
- Author
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You-Min Kim, Yoon-Young Jang, Ji-Eun Jeong, Hye-Jin Park, Ja-Hyun Jang, and Jin-Kyung Kim
- Subjects
Vitamin D hydroxylation-deficient rickets type1A ,Hypocalcemia ,Pediatrics ,RJ1-570 - Abstract
Vitamin D hydroxylation-deficient rickets type 1A (VDDR1A, OMIM 264700) is a rare autosomal recessive inherited disorder. Pathogenic variants in the CYP27B1 gene lead to loss of 1α-hydroxylase activity. We report the case of a 22-month-old toddler who presented with growth retardation and delayed development. The patient exhibited the typical laboratory findings of VDDR1A, including hypocalcemia (calcium: 5.2 mg/dL), elevated serum level of alkaline phosphatase (2,600 U/L), elevated serum level of intact-parathyroid hormone (238 pg/mL), low 1,25(OH)2D3 level (11.2 pg/mL), and normal 25(OH)D3 level (40.7 ng/mL). His height and weight were 76.5 cm and 9.5 kg, respectively (both
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- 2019
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3. Fluorinated Bioactive Glass Nanoparticles: Enamel Demineralization Prevention and Antibacterial Effect of Orthodontic Bonding Resin
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Hyung-Jin Nam, You-Min Kim, Yong Hoon Kwon, Kyung-Hyeon Yoo, Seog-Young Yoon, In-Ryoung Kim, Bong-Soo Park, Woo-Sung Son, Seung-Min Lee, and Yong-Il Kim
- Subjects
anti-demineralization ,white spot lesion ,bioactive glass ,fluorinated bioactive glass ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Orthodontic treatment involving the bonding of fixed appliances to tooth surfaces can cause white spot lesions (WSLs). WSLs increase the likelihood of cavity formation and hence require preservation and prosthetic restoration. Therefore, the prevention of WSLs is of greater importance than treatment. Application of fluoride or the use of fluoride-containing mouthwash can prevent WSLs, but this requires patient cooperation and additional time and cost. Bioactive glass containing 2.5% fluoride was synthesized and mixed with the orthodontic bonding adhesive Transbond XT Low Flow (LV) at ratios of 1, 3, and 5% to prepare orthodontic adhesive samples. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the samples. The Vickers hardness test, bracket retention test, and adhesive remnant index (ARI) of the samples were analysed to determine their mechanical properties. To determine the biological cytotoxicity, the cell activity of the samples was evaluated using cell viability tests and the antibacterial activity was analysed using Streptococcus mutans. To evaluate the anti-demineralization effect, the sample was bonded to extracted teeth and a pH cycle test was performed. Micro computed tomography data were obtained from the bonded teeth and sample, and the anti-demineralization effect was evaluated using the ImageJ software program. The Vickers hardness of the sample was higher than that of LV and was dependent on the concentration of fluoride-containing bioactive glass (FBAG). The bracket retention test and ARI of the sample showed no significant differences from those of LV. The cell viability test showed no significant changes at 24 and 48 h after application of the sample. The fluoride ion release test indicated an ion release rate of 9.5−17.4 μg/cm2. The antibacterial activity of the experimental group containing FBAG was significantly higher than that of the LV group. The anti-demineralization test showed a concentration-dependent increase. However, the resin containing 5 mass% FBAG (FBAG5) showed a statistically-significant increase compared with LV. The orthodontic adhesive containing FBAG showed antibacterial and anti-demineralization effects, thus indicating possible WSL prevention activity.
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- 2019
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4. Enamel Surface Remineralization Effect by Fluorinated Graphite and Bioactive Glass-Containing Orthodontic Bonding Resin
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Hyung-Jin Nam, You-Min Kim, Yong Hoon Kwon, In-Ryoung Kim, Bong-Soo Park, Woo-Sung Son, Seung-Min Lee, and Yong-Il Kim
- Subjects
graphite fluoride bioactive glass ,remineralization ,bioactive glass ,white spot lesion ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
All orthodontic appliances are potentially cariogenic. The plaque around the orthodontic appliance can make demineralization on tooth surface causing white spot lesion (WSL). The most effective method to prevent WSL is Fluoride appliance and gargling, but this requires patient cooperation, which consumes additional treatment time and cost. As suggested in this study, biomaterials like bioactive glass and fluorinated graphite (FGt) having antibacterial and anti-demineralization ability effective and easy to use in the clinic. To clinically use orthodontic bonding resins containing Graphite Fluoride BAG (FGtBAG), its properties, biological stability, antimicrobial activity, and remineralization effect must be verified. BAG was mixed with 2.5% FGt containing 51 to 61% fluorine. This mixture was mixed with the CharmFill Flow (CF) in the ratios of 1, 3, and 5 wt%. Microhardness and shear bond strength tests were performed to evaluate its mechanical properties. MTT (3-(4, 5-dimethyl thiazol-2-yl)-2, 5-diphenyl tetra) assay was performed for evaluating its safety. Streptococcus mutans, which is major cariogen by producing lactic acid, was evaluated for antibacterial ability of reducing WSL. In addition, x-ray images were obtained by CBCT (Cone beam computed tomography) after a pH cycle. The remineralization effect was verified in vivo and by Image J. FGtBAG did not differ significantly from CF in mechanical tests. The MTT assay found no significant differences between the groups. The antibacterial activity of FGtBAG at 24 h and 48 h was significantly higher than that of CF. The fluoride release rate tended to increase with the FGtBAG content. The pH cycle results showed that FGtBAG had higher concentration-dependent remineralization effect than CF. The results of this study suggests that orthodontic resins containing FGtBAG can prevent WSL owing to their antibacterial activity and remineralization effect.
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- 2019
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5. Expansion of CD45RA−FOXP3++ regulatory T cells is associated with immune tolerance in patients with combined kidney and bone marrow transplantation
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Yeongbeen Kwon, Kyo Won Lee, You Min Kim, Hyojun Park, Min Kyung Jung, Young Joon Choi, Jin Kyung Son, JuHee Hong, Su‐Hyung Park, Ghee Young Kwon, Heejin Yoo, Kyunga Kim, Sung Joo Kim, Jae Berm Park, and Eui‐Cheol Shin
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chimerism ,combined kidney and bone marrow transplantation ,regulatory T cells ,tolerance ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Abstract Objectives Simultaneous transplantation of a solid organ and bone marrow from the same donor is a possible means of achieving transplant tolerance. Here, we attempted to identify biomarkers that indicate transplant tolerance for discontinuation of immunosuppressants in combined kidney and bone marrow transplantation (CKBMT). Methods Conventional kidney transplant (KT) recipients (n = 20) and CKBMT recipients (n = 6) were included in this study. We examined various immunological parameters by flow cytometry using peripheral blood mononuclear cells (PBMCs), including the frequency and phenotype of regulatory T (Treg) cell subpopulations. We also examined the suppressive activity of the Treg cell population in the setting of mixed lymphocyte reaction (MLR) with or without Treg cell depletion. Results Among six CKBMT recipients, three successfully discontinued immunosuppressants (tolerant group) and three could not (non‐tolerant group). The CD45RA−FOXP3++ Treg cell subpopulation was expanded in CKBMT recipients compared to conventional kidney transplant patients, and this was more obvious in the tolerant group than the non‐tolerant group. In addition, high suppressive activity of the Treg cell population was observed in the tolerant group. The ratio of CD45RA−FOXP3++ Treg cells to CD45RA−FOXP3+ cells indicated good discrimination between the tolerant and non‐tolerant groups. Conclusion Thus, our findings propose a biomarker that can distinguish CKBMT patients who achieve transplant tolerance and are eligible for discontinuation of immunosuppressants and may provide insight into tolerance mechanisms in CKBMT.
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- 2021
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6. A case of vitamin D hydroxylation-deficient rickets type 1A caused by 2 novel pathogenic variants in CYP27B1 gene.
- Author
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You-Min Kim, Yoon-Young Jang, Ji-Eun Jeong, Hye-Jin Park, Ja-Hyun Jang, and Jin-Kyung Kim
- Subjects
RICKETS ,VITAMIN D ,TODDLERS development ,COGNITIVE development ,ALKALINE phosphatase ,INFANT development - Abstract
Vitamin D hydroxylation-deficient rickets type 1A (VDDR1A, OMIM 264700) is a rare autosomal recessive inherited disorder. Pathogenic variants in the CYP27B1 gene lead to loss of 1a-hydroxylase activity. We report the case of a 22-month-old toddler who presented with growth retardation and delayed development. The patient exhibited the typical laboratory findings of VDDR1A, including hypocalcemia (calcium: 5.2 mg/dL), elevated serum level of alkaline phosphatase (2,600 U/L), elevated serum level of intact-parathyroid hormone (238 pg/mL), low 1,25(OH)2D3 level (11.2 pg/mL), and normal 25(OH)D3 level (40.7 ng/mL). His height and weight were 76.5 cm and 9.5 kg, respectively (both <3rd percentile). The Bayley Scales of Infant and Toddler Development II indicated significantly delayed development (mental development index <50, psychomotor development index <50). The patient was a compound heterozygous for two novel pathogenic variants in the CYP27B1 gene: c.57_69del (p.Glu20Profs*2) and c.171dupG (p.Leu58Alafs*275), inherited from his mother and father, respectively. The patient showed remarkable improvement after treatment with calcitriol and calcium carbonate. [ABSTRACT FROM AUTHOR]
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- 2019
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7. Antibacterial and remineralization effects of orthodontic bonding agents containing bioactive glass.
- Author
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You-Min Kim, Dong-Hyun Kim, Chang Weon Song, Seog-Young Yoon, Se-Yeon Kim, Hee Sam Na, Jin Chung, Yong-Il Kim, and Yong Hoon Kwon
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ANTIBACTERIAL agents ,REMINERALIZATION (Teeth) ,ORTHODONTICS ,BIOACTIVE glasses ,BODY mass index - Published
- 2018
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8. Dysfunctional adipocytes promote tumor progression through YAP/TAZ-dependent cancer-associated adipocyte transformation
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Yaechan Song, Heeju Na, Seung Eon Lee, You Min Kim, Jihyun Moon, Tae Wook Nam, Yul Ji, Young Jin, Jae Hyung Park, Seok Chan Cho, Jaehoon Lee, Daehee Hwang, Sang-Jun Ha, Hyun Woo Park, Jae Bum Kim, and Han-Woong Lee
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Science - Abstract
Abstract Obesity has emerged as a prominent risk factor for the development of malignant tumors. However, the existing literature on the role of adipocytes in the tumor microenvironment (TME) to elucidate the correlation between obesity and cancer remains insufficient. Here, we aim to investigate the formation of cancer-associated adipocytes (CAAs) and their contribution to tumor growth using mouse models harboring dysfunctional adipocytes. Specifically, we employ adipocyte-specific BECN1 KO (BaKO) mice, which exhibit lipodystrophy due to dysfunctional adipocytes. Our results reveal the activation of YAP/TAZ signaling in both CAAs and BECN1-deficient adipocytes, inducing adipocyte dedifferentiation and formation of a malignant TME. The additional deletion of YAP/TAZ from BaKO mice significantly restores the lipodystrophy and inflammatory phenotypes, leading to tumor regression. Furthermore, mice fed a high-fat diet (HFD) exhibit decreased BECN1 and increased YAP/TAZ expression in their adipose tissues. Treatment with the YAP/TAZ inhibitor, verteporfin, suppresses tumor progression in BaKO and HFD-fed mice, highlighting its efficacy against mice with metabolic dysregulation. Overall, our findings provide insights into the key mediators of CAA and their significance in developing a TME, thereby suggesting a viable approach targeting adipocyte homeostasis to suppress cancer growth.
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- 2024
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9. Author Correction: Dysfunctional adipocytes promote tumor progression through YAP/TAZ-dependent cancer-associated adipocyte transformation
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Yaechan Song, Heeju Na, Seung Eon Lee, You Min Kim, Jihyun Moon, Tae Wook Nam, Yul Ji, Young Jin, Jae Hyung Park, Seok Chan Cho, Jaehoon Lee, Daehee Hwang, Sang-Jun Ha, Hyun Woo Park, Jae Bum Kim, and Han-Woong Lee
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Science - Published
- 2024
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10. Experimental Verification of the Impact of the Contact Area between the Defect Site and the Scaffold on Bone Regeneration Efficacy
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You Min Kim, Min-Soo Ghim, Meiling Quan, Young Yul Kim, and Young-Sam Cho
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scaffold ,shape conformity ,contact area ,bone regeneration efficacy ,Organic chemistry ,QD241-441 - Abstract
In the field of bone tissue engineering, which is being developed for the ideal restoration of bone defects, researchers are exploring the improvement of the bone regeneration efficacy of scaffolds through various approaches involving osteoconductive, osteoinductive, and angiogenic factors. In the current trend of research, there is also a suggestion that the topological factors of recent scaffolds may influence the attachment, migration, proliferation, and differentiation of bone cells. Building upon experimental confirmation of the effect of scaffold conformity with the defect site on enhanced bone regeneration in previous studies, we conducted this research to experimentally investigate the relationship between contact area with the defect site and bone regeneration efficacy. The results demonstrated that as the contact area of the scaffold increased, not only did the resistance to bone tissue growth increase, more significant bone regeneration also occurred, as evidenced through histological analysis and micro-CT analysis. This research confirms that the contact area between the scaffold and the defect site is a critical variable affecting bone regeneration efficacy, emphasizing its importance when designing customized scaffolds. This finding holds promising implications for future studies and applications in the field.
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- 2024
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11. Late complication of the Nuss procedure: recurrent cardiac tamponade
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Won Jong Park, Jang Won Son, Kyu Hwan Park, You Min Kim, Jong Ho Nam, Kang Un Choi, and Jung Ho Kim
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Cardiac tamponade ,Complication ,Nuss procedure ,Pectus excavatum ,Medicine (General) ,R5-920 - Abstract
Pectus excavatum (PE) is known as one of the most common congenital deformities of the anterior chest wall. The Nuss procedure is an effective surgical therapy to correct PE. Here, we report a case of recurrent cardiac tamponade due to hemopericardium that occurred after 16 months following the Nuss procedure. The cause of recurrent hemopericardium was thought to be local, repetitive irritation of the pericardium by the Nuss steel bar. We should keep in mind that this serious complication can occur after the Nuss procedure, even in the late phase.
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- 2019
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12. Therapeutic strategies for locally recurrent and metastatic de-differentiated liposarcoma with herpes simplex virus--thymidine kinase--expressing mesenchymal stromal cells.
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HYUNJOO LEE, EUN BYEOL JO, SU JIN KIM, HEUNG MO YANG, YOU MIN KIM, YOUNG CHUL SUNG, JAE BERM PARK, DOOPYO HONG, HYOJUN PARK, YOON-LA CHOI, and SUNG JOO KIM
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LIPOSARCOMA , *CYTOPROTECTION , *SKIN infections , *METASTASIS , *CELL-mediated cytotoxicity - Abstract
Background aims. Major challenges in de-differentiated liposarcoma (DDLPS) therapy are the high rate of sequential recurrence (>80%) and metastasis (20-30%) following surgical removal. However, well-defined therapeutic strategies for this rare malignancy are lacking and are critically needed. Methods. We investigated a new approach to DDLPS therapy with mesenchymal stromal cells expressing herpes simplex virus-thymidine kinase (MSC-TK). In an effort to evaluate this efficacy, in vitro cytotoxicity of MSC-TK against DDLPS cells was analyzed using an apoptosis assay. For pre-clinical study, the MSC-TK-induced reduction in recurrence and metastasis was validated in a recurrent DDLPS model after the macroscopic complete resection and lung metastasis DDLPS model. Results. MSC-TK induced apoptosis in DDLPS cells by bystander effects via gap junction intracellular communication (GJIC) of toxic ganciclovir (GCV)- Recurrent DDLPS models following no residual tumor/microscopic tumor resection and lung metastasis DDLPS models were established, which suggested clinical relevance. MSC-TK markedly reduced locoregional recurrence rates and prolonged recurrence-free survival, thus increasing overall survival in the recurrent DDLPS model. MSC-TK followed by GCV treatment yielded a statistically significant reduction in earlyand advanced-stage lung metastasis. Discussion. This therapeutic strategy may serve as an alternative or additional strategy by applying MSC-TK to target residual tumors following surgical resection, thus reducing local relapse and metastasis in these patients. [ABSTRACT FROM AUTHOR]
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- 2017
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