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60 result(s) for "Kim, June-Hyun"
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Eleutherococcus sessiliflorus Inhibits Receptor Activator of Nuclear Factor Kappa-B Ligand (RANKL)-Induced Osteoclast Differentiation and Prevents Ovariectomy (OVX)-Induced Bone Loss
The aim of this study was to evaluate the effects of root bark of Eleutherococcus sessiliflorus (ES) on osteoclast differentiation and function in vitro and in vivo. In vitro, we found that ES significantly inhibited the RANKL-induced formation of TRAP-positive multinucleated osteoclasts and osteoclastic bone resorption without cytotoxic effects. ES markedly downregulated the expression of nuclear factor of activated T cells cytoplasmic 1 (NFATc1); c-Fos; and osteoclast-related marker genes, such as TRAP, osteoclast-associated receptor (OSCAR), matrix metalloproteinase-9 (MMP-9), calcitonin receptor, cathepsin K, the 38 kDa d2 subunit of the vacuolar H+-transporting lysosomal ATPase (Atp6v0d2), dendritic cell-specific transmembrane protein (DC-STAMP), and osteoclast-stimulatory transmembrane protein (OC-STAMP). These effects were achieved by inhibiting the RANKL-mediated activation of MAPK signaling pathway proteins, including p38, ERK, and JNK. In vivo, ES attenuated OVX-induced decrease in bone volume to tissue volume ratio (BV/TV), trabecular thickness (Tb.Th), trabecular number (Tb.N), and bone mineral density, but increased trabecular separation (Tb.Sp) in the femur. Collectively, our findings showed that ES inhibited RANKL-activated osteoclast differentiation in bone marrow macrophages and prevented OVX-mediated bone loss in rats. These findings suggest that ES has the potential to be used as a therapeutic agent for bone-related diseases, such as osteoporosis.
Characteristic and remediation of radioactive soil in nuclear facility sites: a critical review
A huge amount of radioactive soil has been generated through decommissioning of nuclear facilities around the world. This review focuses on the difficulties and complexities associated with the remediation of radioactive soils at the site level; therefore, laboratory studies were excluded from this review. The problems faced while remediating radioactive soils using techniques based on strategies such as dry separation, soil washing, flotation separation, thermal desorption, electrokinetic remediation, and phytoremediation are discussed, along with appropriate examples. Various factors such as soil type, particle size, the fraction of fine particles, and radionuclide characteristics that strongly influence radioactive soil decontamination processes are highlighted. In this review, we also survey and compare the pool of available technologies currently being used for the remediation of radionuclide-contaminated soils, as well as the economic aspects of soil remediation using different techniques. This review demonstrates the importance of the integrated role of various factors in determining the effectiveness of the radioactive soil decontamination process.
Hydrothermal Desorption of Cs with Oxalic Acid from Hydrobiotite and Wastewater Treatment by Chemical Precipitation
A hydrobiotite (HBT) clay contains more cesium (Cs)-specific adsorption sites than illitic clay, and the capacity of frayed edge sites can increase as the weathering of micaceous minerals proceeds. Thus, Cs can be selectively adsorbed to HBT clay. In this study, we investigated the removal efficiency of non-radioactive (133Cs) and radioactive (137Cs) Cs from HBT, using oxalic acid. We found the minimum optimal concentration of 0.15 M oxalic acid removed more than 90% of Cs. Subsequently, cations and Cs ions were removed using Ca(OH)2 and sodium tetraphenylborate (NaTPB) to treat the washing wastewater generated at the optimum concentration of the desorbent (0.15 M oxalic acid). In order to remove cations and heavy metal ions in the waste solution, Ca(OH)2 was treated at a mass ratio of 0.025 g/mL and pH 9–10 to derive optimal conditions. As a final step, to remove Cs, NaTPB was treated with a mass ratio of 2 mg/mL and reduced to below 0.1 mg/L Cs to find the optimal dose. The novelty of this study is that the amount of radioactive waste can be drastically reduced by removing the non-radioactive cations and heavy metals separately in the first step and removing the remaining radioactive Cs in the second step.
Characterization of Bioactive Compounds Having Antioxidant and Anti-Inflammatory Effects of Liliaceae Family Flower Petal Extracts
Beneficial natural products utilized in cosmetics formulation and pharmaceutical applications are of enormous interest. Lily (Lilium) serves as an essential edible and medicinal plant species with wide classification. Here, we have performed the screening of various extracts that were prepared from flower petals grown from the bulbs of eight Lilium varieties, with a viewpoint to their applicability as a viable source of natural anti-inflammatory and antioxidants agent. Interestingly, our findings indicated that all ethanol and water extracts exhibited a substantially differential spectrum of antioxidant as well as anti-inflammatory properties. Specifically, Serrano showed a close similarity among ethanol and water extracts among all tested lily petal extracts. Therefore, to obtain a detailed analysis of chemical compounds, liquid chromatography–mass spectroscopy was performed in ethanolic and water extracts of Serrano petals. Together, our preliminary results indicated that lily petals extracts used in this study could serve as a basis to develop a potential new whitening agent with powerful antioxidant and anti-inflammatory properties for medicinal, functional food, and cosmetic applications.
Enhanced selective separation of fine particles from Cs-contaminated soil using magnetic nanoparticles
PurposeIn the case of the contaminated soil from the nuclear sites, higher concentrations are found in smaller particles by analyzing the distributions of radioactivity for the various soil particle sizes. Therefore, the methods to separate the highly contaminated smallest particles from the remaining materials are essential to any soil decontamination strategy. The aim of the study was to investigate the magnetic separation of Cs-contaminated clay from soil by using naked Fe3O4 nanoparticles under low pH condition.Materials and methodsFor the magnetic separation of clay from the solution, the synthesized magnetic nanoparticles (MNPs) were mixed with clay at various MNPs/clay mass ratios in the pH-adjusted solution, and then the MNPs–clay complexes were separated from the solution by using a permanent magnet. The effects of combining the magnetic and sieving methods were also evaluated. The magnetic separations of clay from soil were carried out in an open Plexiglas chamber. When sieve separation was combined with magnetic separation, the 200-mesh sieve was inserted into the chamber in the vertical direction. After magnetic separation, the particle size distribution of each soil fraction was analyzed. In addition, waste volume reduction and the Cs removal from contaminated soil by using magnetic-sieving separation were assessed.Results and discussionThe efficiency of the recovery of clay minerals from the solution increases significantly with the increases in the MNP dosage and is more than 90% under acidic conditions when the mass ratio of MNPs to clay is near 0.1. Increases in electrostatic attraction and dispersion at low pH are beneficial for the magnetic separation of the clay mineral. In separation experiments on soil mixtures, MNPs were found to separate silt- and clay-sized fine particles selectively; the separation efficiency improves when a sieve is used to exclude physically large particles. In addition, we used the magnetic-sieving separation method to separate Cs-contaminated fine soil under acidic conditions: a decontamination efficiency of the treated soil of 58.5% was achieved by removing the highly contaminated fine soil fraction.ConclusionsThe use of magnetic separation under acidic conditions was found to be highly effective for soil decontamination through the selective removal of fine clay particles without additional treatment. Therefore, the proposed magnetic-sieving separation using MNPs may be a viable option for removing fine particles from contaminated soil in the remediation of radioactive soil.
Cs desorption behavior during hydrothermal treatment of illite with oxalic acid
The desorption of radioactive cesium (Cs) in soil is influenced by the clay mineral type, adsorption site, and concentration of Cs. In this study, experiments to detect desorption of non-radioactive and radioactive Cs from illite using oxalic acid were performed for 2 days at 70 °C in hydrothermal conditions. The results showed that the 133 Cs removal efficiency by oxalic acid and inorganic acid treatment was similar at high concentration (22.86 mmol/kg) of non-radioactive 133 Cs. In the radioactive 137 Cs experiment, the removal efficiency by oxalic acid was higher than that by inorganic acid at low concentration (0.79 × 10 −6  mmol/kg) of radioactive 137 Cs. Based on the illite hypothetical frayed edge site (FES) concentration of 0.612 mmol/kg, the results suggested that 137 Cs was preferentially adsorbed to FES on illite. The 137 Cs at low concentration was difficult to remove because it was irreversible adsorption to FES, while the non-radioactive Cs at high concentration was mainly adsorbed to planar sites, and so was easy to desorb by ion exchange. Based on the results of NMR, FTIR, and XPS analyses, we concluded that the higher efficiency of 137 Cs removal at low concentration by oxalic acid treatment than by treatment with inorganic acid was because of chelation effects associated with the complexation of oxalic acid (ligands) and metal ions in irreversible site (FES).
A Platform for Determining Medicinal Plants with Targeted 17β-Hydroxysteroid Dehydrogenase Modulation for Possible Hair Loss Prevention
Although hair loss plays a vital physiological function in present society, their impact on shaping self-esteem is undeniable. Even though there are numerous synthetic drugs available, these days, there are issues with safety, efficiency, and unclear time settings for required outcomes with the current synthetic drug remedies available; therefore, there is growing attention to discovering alternative methods to fight hair loss, primarily through plant-derived formulations. While earlier reports mostly focused on screening compounds or plant extracts affecting 5α-reductase, our research takes a unique direction. We employed a biochemical and molecular biological approach by delving into the complicated biosynthetic pathways involving 17β-hydroxysteroid dehydrogenase (17β-HSD) and 3β-hydroxysteroid dehydrogenase (3β-HSD) in producing testosterone derived from cholesterol. This process conceded requiring experimental results, posing insights into the control of the testosterone/dihydrotestosterone (DHT) production pathway. Our study confirms a discovery platform for finding potential candidates as hair loss inhibitors, highlighting exploring various biochemical mechanisms involving 17β-HSD and 3β-HSD in combination with medicinal plant extracts.
Blockade of Cellular Energy Metabolism through 6-Aminonicotinamide Reduces Proliferation of Non-Small Lung Cancer Cells by Inducing Endoplasmic Reticulum Stress
The pentose phosphate pathway (PPP) is the most common pathway in most cancer cells and stimulates antioxidant defense mechanisms and synthesis of biomolecule precursors. It is believed that cancer cells persistently ameliorate glucose flux into the PPP to maintain their anabolic requirements and adjust oxidative stress. TCGA analyses have indicated the upregulation of enzymes involved in PPP in lung cancer. Hence, the present study aimed to determine whether the pharmacological blockade of glucose 6-phosphate dehydrogenase (G6PD), the primary and rate-limiting enzyme involved in PPP, using 6-aminonicotinamide (6-AN), could induce antiproliferative activity in two lung cancer cell lines. Exposure to 6-AN suppressed lactate production and glucose consumption, modified the mitochondrial potential and redox balance, and thereby induced the endoplasmic reticulum (ER) stress to reduce lung cancer cell proliferation and govern cellular apoptosis. Collectively, this is the first study in which PPP blockade by 6-AN causes reactive oxygen species (ROS)-mediated apoptosis by ER stress in lung cancer cells. Further preclinical studies will be conducted to validate the biological applicability of these findings.
Plasma neutrophil gelatinase-associated lipocalin is independently associated with left ventricular hypertrophy and diastolic dysfunction in patients with chronic kidney disease
Cardiovascular disease (CVD) is a leading cause of death in patients with chronic kidney disease (CKD). Left ventricular hypertrophy (LVH) and left ventricular diastolic dysfunction (LVDD) are known as predictors of CVD in these patients. Neutrophil gelatinase-associated lipocalin (NGAL) is a biomarker of acute kidney injury. Recently, elevated NGAL levels have been reported in patients with CVD. This study aimed to evaluate the association between plasma NGAL levels and LVH/LVDD in patients with CKD. This study included 332 patients with pre-dialysis CKD (estimated glomerular filtration rate (eGFR) < 60 ml/min/1.73m2). Two-dimensional echocardiography was performed to measure the left ventricular mass index (LVMI). Tissue Doppler imaging was used to measure early mitral inflow velocity (E) and the peak early mitral annular velocity (E'). Diastolic function was estimated using E' and the ratio of E to E' (E/E'). The associations of echocardiographic index with clinical and laboratory variables (age, sex, diabetes, hypertension, eGFR, albumin, uric acid, calcium, phosphate, total cholesterol, hemoglobin, C-reactive protein, intact parathyroid hormone (PTH), the inferior vena cava collapse index (IVCCI) < 50%, and plasma NGAL) were investigated using univariate and multivariate analyses. In multivariate logistic regression analysis, plasma NGAL was an independent predictor of LVH (OR: 1.02, 95% CI: 1.01-1.02), P < 0.001). In addition, hypertension, intact PTH, and IVCCI < 50% were independent predictors of LVH. Plasma NGAL (OR: 1.02, 95% CI: 1.01-1.02, P < 0.001) was also an independent factor of LVDD. Furthermore, hypertension, intact PTH, and IVCCI < 50% were independent predictors of LVDD. Receiver operating characteristic curve analysis (area under the curve: 0.835, 95% CI: 0.792-0.879) showed the best cutoff value of plasma NGAL for identifying LVDD was ≥ 258 ng/ml with an associated sensitivity of 77.6% and a specificity of 87.6%. Plasma NGAL levels were independent predictors of LVH and LVDD in patients with pre-dialysis CKD, suggesting that plasma NGAL could be a biomarker for LVH and LVDD in these patients.
Eco‐friendly materials for next‐generation vaccination: From concept to clinical reality
The vaccine is a premier healthcare intervention strategy in the battle against infectious infections. However, the development and production of vaccines present challenges in terms of complexity, cost, and time consumption. Alternative methodologies, such as nonthermal plasma and plant‐based technologies, have emerged as potential alternatives for conventional vaccine manufacturing processes. While plasma‐based approaches offer a rapid and efficient pathogen inactivation method devoid of harsh reagents, plant‐based techniques present a more economically viable and scalable avenue for vaccine production. The imperative urges these approaches to address pressing global health challenges posed by emerging and recurring infectious diseases, surpassing the limitations of traditional vaccine fabrication methods. The primary goal of this review is to provide a comprehensive overview of the current research landscape, covering conceptualization, production, and potential advantages of plasma‐based and plant‐based vaccines. Furthermore, exploring the obstacles and opportunities intrinsic to these strategies is undertaken, elucidating their potential impact on vaccination strategies. This systematic presentation specifies a detailed outline of recent vaccine research and developments, emphasizing the possibility of advanced green approaches to produce effective and secure vaccination programs. Vaccines are critical in the fight against infectious diseases; however, developing them is challenging. Plasma and plant‐based techniques are emergent, which offer scalable, cost‐effective pathogen deactivation without using harsh chemicals. These systems overtake traditional ones in tackling issues with universal health. We emphasize cutting‐edge approaches for effectual and secure vaccines while examining their benefits and feasible impact on immunization line‐ups.