Publications by authors named "Kwang-Hyun Park"

This study presents a novel approach targeting CD155, an overexpressed protein in lung adenocarcinoma (LUAD), using nanobodies with exceptional precision and efficacy. The significant upregulation of CD155 in LUAD, associated with poor patient outcomes, highlights its potential as a therapeutic target. An anti-CD155 nanobody (A5 Nb) is developed that binds to CD155-positive lung cancer cells with high affinity (A5 Nb K = 0.

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Nanobodies offer significant therapeutic potential due to their small size, stability, and versatility. Although advancements in computational protein design have made designing de novo nanobodies increasingly feasible, there are limited tools specifically tailored for this purpose. Rosetta with its specialized protocols, is a prominent tool for nanobody design but is limited by a high false-negative rate, necessitating extensive high-throughput screening.

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In this study, we aimed to investigate whether the physiological activity of ethanol extracts of was improved after fermentation with strains KCTC 3108 (FLP8) and KCL005 (FLP9). Total polyphenol and flavonoid content was substantially increased after fermentation with FLP8 and FLP9 for 48 h and 24 h, respectively, compared with the unfermented control. The 6-gingerol content was significantly increased in FLP9 after 24 h of fermentation, whereas in FLP8, it remained comparable to pre-fermentation levels.

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  • Cas12j is a compact Cas protein with potential for CRISPR diagnostics, but its trans-cleavage activity was previously unclear.
  • This study investigates the performance of different Cas12j variants for nucleic acid detection, identifying their target preferences and optimal reaction conditions.
  • The developed EXP-J assay effectively detects miRNAs, demonstrating promise for molecular diagnostics, especially by identifying oncogenic miRNAs in plasma from lung cancer patients.
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  • * This study investigates the effects of catechin 7-O--D-apiofuranoside on muscle cell apoptosis and protein/gene expression in a model of muscle atrophy, using techniques like Western blotting and RT-PCR.
  • * Results show that catechin extract reduces muscle-degradation proteins (Atrogin-1, MuRF1) while boosting muscle-synthesis proteins (MyoD, Myogenin), hinting at its potential for preventing muscle loss and promoting health through functional foods and medicines.
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Targeting the hydrophobic Phe43 pocket of HIV's envelope glycoprotein gp120 is a critical strategy for antiviral interventions due to its role in interacting with the host cell's CD4. Previous inhibitors, including small molecules and CD4 mimetic peptides based on scyllatoxin, have demonstrated significant binding and neutralization capabilities but were often chemically synthesized or contained non-canonical amino acids. Microbial expression using natural amino acids offers advantages such as cost-effectiveness, scalability, and efficient production of fusion proteins.

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  • The CRISPR activator (CRISPRa) system is a new tool that regulates gene expression without damaging DNA but has issues with efficacy and accuracy using Cas9/Cas12a.
  • Researchers created a more efficient CRISPRa system using a smaller effector, CWCas12f, to improve gene regulation by optimizing its components.
  • The new eCWCas12f-VPR system shows promise for precise control of gene expression in living organisms and could pave the way for advancements in gene therapy and biological studies.
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  • Aging causes tissue and cellular changes, mainly due to oxidative stress and inflammation, which lead to diseases related to aging.
  • The study investigates the anti-inflammatory and antioxidant properties of Korean Hance, a traditional herb, to combat muscle loss and atrophy through various tests and analyses.
  • Results show that the extract supports muscle gene expression, reduces inflammation, and enhances antioxidant levels, suggesting its potential for developing new treatments for muscle atrophy.
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With a rising interest in smart windows and optical displays, the utilization of metal oxides (MOs) has garnered significant attention owing to their high active sites, flexibility, and tunable electronic and optical properties. Despite these advantages, achieving precise tuning of optical properties in MOs-based quantum dots and their mass production remains a challenge. In this study, we present an easily scalable approach to generate WO quantum dots with diverse sizes through sequential insertion/exfoliation processes in solvents with suitable surface tension.

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The use of powered activated carbon is often limited by inconsistent particle sizes and porosities, leading to reduced adsorption efficiencies. In this study, we demonstrated a practical and environmentally friendly method for creating a 3D graphene nanostructure with highly uniform ultramicropores from wood-based biomass through a series of delignification, carbonization, and activation processes. In addition, we evaluated the capture characteristics of this structure for CO, CH, and N gases as well as its selectivity for binary-mixture gases.

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Curcuma longa and Sargassum coreanum are commonly used in traditional pharmaceutical medicine to improve immune function in chronic diseases. The present study was designed to systematically elucidate the in vitro and in vivo immuno-enhancing effects of a combination of C. longa and S.

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Background: Traditional skin grafts for syndactyly often cause color mismatches and unsightly donor sites, whereas no-skin graft methods leave noticeable dorsal hand scars. This study presents a plantar full-thickness skin graft (FTSG) from the weight-bearing midline area for syndactyly repair, a novel approach not previously reported in the literature.

Methods: The study included 3 groups of patients with congenital syndactyly of the hand who underwent primary operations with plantar FTSG ( n = 70), groin FTSG ( n = 20), and no-skin graft techniques ( n = 22).

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In hand and upper extremity replantation surgery, simultaneous free flap reconstruction restores the physiologic circulation to the amputated part, ensuring its survival, and promotes wound healing through anatomic restoration. Especially in digit replantation, an arterialized venous flap serves to reconstruct both vessel and soft tissue defects simultaneously. Delayed free flap reconstruction aims to enhance both functional improvement and cosmetic acceptance in a successfully replanted part using flaps that include functioning muscle, bone, joint, nerve, and soft tissue.

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Reconstruction of traumatic nail bed defects in the digits is a frequently encountered procedure, yet often presents many challenges. In such scenarios, staged procedures may be required with significant limitations in shape and increased donor site morbidity, particularly when multiple defects are present. In this study, we introduce a simple method for the reconstruction of nail bed defects using an acellular dermal matrix (ADM).

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It is difficult to obtain ultrathin two-dimensional (2D) tungsten trioxide (WO) nanosheets through direct exfoliation from bulk WO in solution due to the strong bonding between interlayers. Herein, WO nanosheets with controllable sizes were synthesized via K intercalation and the exfoliation of WO powder using sonication and temperature. Because of the intercalation and expansion in the interlayer distance, the intercalated WO could be successfully exfoliated to produce a large quantity of individual 2D WO nanosheets in -methyl-2-pyrrolidone under sonication.

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Fisetin is a flavonoid found in plants and has been reported to be effective in various human diseases. However, the effective mechanisms of ultraviolet-A (UVA)-mediated skin damage are not yet clear. In this study, we investigated the protective mechanisms of fisetin regarding UVA-induced human dermal fibroblasts (HDFs) and human epidermal keratinocytes (HEKs) damages.

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The diterpene glycosyltransferase UGT76G1, derived from Stevia rebaudiana, plays a pivotal role in the biosynthesis of rebaudioside A, a natural sugar substitute. Nevertheless, its potential for industrial application is limited by certain enzymatic characteristics, notably thermostability. To enhance the thermostability and enzymatic activity, we employed a computational design strategy, merging stabilizing mutation scanning with a Rosetta-based protein design protocol.

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Endonucleases have recently widely used in molecular diagnostics. Here, we report a strategy to exploit the properties of Argonaute (Ago) proteins for molecular diagnostics by introducing an artificial nucleic acid circuit with Ago protein (ANCA) method. The ANCA is designed to perform a continuous autocatalytic reaction through cross-catalytic cleavage of the Ago protein, enabling one-step, amplification-free, and isothermal DNA detection.

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Activated carbon (AC) compounds derived from biomass precursors have garnered significant attention as electrode materials in electric double-layer capacitors (EDLCs) due to their ready availability, cost-effectiveness, and potential for mass production. However, the accessibility of their active sites in electrochemistry has not been investigated in detail. In this study, we synthesized two novel macro/micro-porous carbon structures prepared from a chitosan precursor using an acid/potassium hydroxide activation process and then examined the relationship between their textural characteristics and capacitance as EDLCs.

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A clear understanding of the structure-property relationship of intrinsically stretchable polymer semiconductors (ISPSs) is essential for developing high-performance polymer-based electronics. Herein, we investigate the effect of the fluorination position on the crystalline structure, charge-carrier mobility, and stretchability of polymer semiconductors based on a benzodithiophene--benzotriazole configuration. Although four different polymer semiconductors showed similar field-effect mobilities for holes (μ ≈ 0.

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The CRISPR-Cas9 system is a widely used gene-editing tool, offering unprecedented opportunities for treating various diseases. Controlling Cas9/dCas9 activity at specific location and time to avoid undesirable effects is very important. Here, we report a conditionally active CRISPR-Cas9 system that regulates target gene expression upon sensing cellular environmental change.

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Metallic-phase transition metal dichalcogenide quantum dots (TMDs-QDs) have been reported in recent years. However, a dominant mechanism for modulating their intrinsic exciton behaviors has not been determined yet as their size is close to the Bohr radius. Herein, we demonstrate that the oxidation effect prevails over quantum confinement on metallic-phase tungsten dichalcogenide QDs (WX-QDs; X = S, Se) when the QD size becomes larger than the exciton Bohr radius.

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Article Synopsis
  • Plant cells can change their function and regenerate into new plants through the combined effects of two hormones: auxin and cytokinin.
  • The study focuses on the role of a specific gene called WUSCHEL (WUS), which influences the ability of different potato genotypes to regenerate shoots.
  • Findings indicate that higher levels of WUS lead to better regeneration rates, and adjusting cytokinin types can enhance regeneration, particularly in genotypes with lower efficiency.
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In this study, we aimed to develop natural and/or functional materials with antioxidant and anti-inflammatory effects. We obtained extracts from natural plants through an oil and hot-water extraction process and prepared an extract composite of an effective unsaturated fatty acid complex (EUFOC). Furthermore, the antioxidant effect of the extract complex was evaluated, and the anti-inflammatory effect was explored by assessing its inhibitory effect on nitric oxide production through its HA-promoting effect.

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