Publications by authors named "Ki Chang"

Study Design: Prospective radiographic study.

Objective: To investigate the feasibility of controlling quality of reconstructed sagittal balance for sagittal imbalance.

Summary Of Background Data: Patients with sagittal imbalance cannot walk or stand erect without overwork of musculature because of compromised biomechanical advantage.

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  • Increased expression of aldose reductase (AR) in human keratinocytes helps reduce UVB-induced cell death and aging by moderating oxidative stress effects.
  • Overexpression of AR leads to lower levels of reactive oxygen species and reduced activation of certain stress-related kinases, while inhibiting AR results in increased cellular damage and senescence.
  • Transgenic mice with higher AR expression show lower apoptosis from UVB exposure, highlighting AR's potential protective role in skin cells against UVB-induced oxidative stress.
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Background And Purpose: Recently, metformin, a well-known anti-diabetic drug, has been shown to possess anti-inflammatory activities. This study investigated the effect of metformin on the expression of pro-inflammatory cytokines including high mobility group box 1 (HMGB1) in lipopolysaccharide (LPS)-treated animals and cells.

Experimental Approach: We investigated whether metformin inhibits the release of HMGB1 in LPS-treated RAW 264.

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Activation of nicotinic acetylcholine receptor alpha7 subunit (α7nAChR) by nicotine leads to the improved survival rate in experimental model of sepsis. Previously, we demonstrated that heme oxygenase (HO)-1 inducers or carbon monoxide significantly increased survival of lipopolysaccharide (LPS)-induced and cecal ligation and puncture-induced septic mice by reduction of high mobility group box 1 release, a late mediator of sepsis. However, that activation of α7nAChR by nicotine provides anti-inflammatory action through HO-1 upregulation has not been elucidated.

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Ethnopharmacological Relevance: The methanol extracts of Carthamus tinctorius (MEC) have long been used in traditional medicine as anti-inflammatory agent, however, the molecular mechanism by which MEC shows anti-inflammatory action is not investigated.

Aim Of The Study: Induction of heme oxygenase-1 (HO-1) by many medicinal herbs has been reported excellent anti-inflammatory action. Thus, the aim of the study is to explore whether anti-inflammatory action of MEC is related with HO-1 induction in RAW 264.

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Activators of PPAR have been demonstrated to inhibit the induction of VCAM-1 but not ICAM-1 in human endothelial cells (EC). During the screening of anti-inflammatory activity of traditional herbs, we found 7,8-didehydrocimigenol (7,8-DHC), one of active triterpenoids of Cimicifugae rhizoma (C. rhizoma) increases PPAR-γ expression in EC in a time- and dose-dependent manner.

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Ethnopharmacological Relevance: The methanol extract of Cimicifugae Rhizome has been traditionally used in various disorders including inflammation.

Aim Of The Study: The aim of the study is to explore whether anti-inflammatory action of 3 active compounds, two triterpenoid glycosides (cimiside E, 23-O-actylshengmanol-3-xyloside) and one furanocoumarin (isoimperatorin), isolated from Cimicifugae Rhizome is related with peroxisome proliferator-activated receptor-γ (PPAR-γ) expression in human umbilical endothelial cell line, EA.hy926 cells.

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Phosphotase and tensin homolog deleted on chromosome 10 (PTEN) is a potent negative regulator of PI3K/Akt pathway. Here, we tried to elucidate the role of PTEN in the regulation of endothelial adhesion molecules, vascular cell adhesion molecule (VCAM)-1 and intracellular adhesion molecule (ICAM)-1, induced by TNF-α in human endothelial cells (ECs). Transfection with PTEN overexpressing vector resulted in the significant decrease in phosphorylation of Akt in TNF-α-treated ECs.

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Penicillium marneffei is the only dimorphic fungus among Penicillium spp. that can cause a fatal infection in immunocompromised patients. P.

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Beyond its vasodilator role, vascular nitric oxide (NO), which is synthesized by endothelial NO synthase (eNOS) via its activation, has been shown to play a number of other beneficial roles in the vascular system; it inhibits proliferation of vascular smooth muscle cells, prevents platelet aggregation, and regulates endothelial apoptosis. Such beneficial roles have been shown to be implicated in the regulation of endothelial functions. A loss of NO bioavailability that may result either from decreased eNOS expression and activity or from increased NO degradation is associated with endothelial dysfunction, a key factor in the development of vascular diseases.

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Spider dragline silk is a remarkably strong fiber that makes it attractive for numerous applications. Much has thus been done to make similar fibers by biomimic spinning of recombinant dragline silk proteins. However, success is limited in part due to the inability to successfully express native-sized recombinant silk proteins (250-320 kDa).

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Silk fibroin (SF) is a natural, degradable, fibrous protein that is biocompatible, is easily processed, and possesses unique mechanical properties. Another natural material, wool keratose (WK), is a soluble derivative of wool keratin, containing amino acid sequences that induce cell adhesion. Here, we blended SF and WK to improve the poor electrospinability of WK and increase the adhesiveness of SF.

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The human apolipoprotein E (APOE) gene contains several single-nucleotide polymorphisms (SNPs) that are distributed across the gene. The genotype of the APOE gene has important implications as a risk factor for various diseases. We observed 2 cases in which the results of allele-specific PCR (AS-PCR) of the APOE gene were not consistent with those of fluorescence resonance energy transfer (FRET) or sequencing analysis.

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Background: Bisalbuminemia is a hereditary or an acquired condition characterized by the presence of 2 albumin variants with different mobilities on serum protein electrophoresis (SPE). The clinical significance of bisalbuminemia has not been clearly established. However, some regions of the albumin variant may affect the biochemical analysis of biomolecules such as steroid or thyroid hormones by altering their albumin-binding affinities.

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Purpose: To describe etiologies and clinical characteristics of corneal opacities leading patients to seek cosmetic treatments.

Methods: The medical records of 401 patients who presented for cosmetic improvement in corneal opacities between May 2004 and July 2007 were retrospectively reviewed. The following parameters were analyzed: age, gender, cause of corneal opacity, time course of the corneal disease, associated diseases, prior and current cosmetic treatments, visual acuity, location and depth of the corneal opacity, and the presence of either corneal neovascularization or band keratopathy.

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Reduction of high-mobility group box 1 (HMGB1) and NO levels may be important therapeutic strategy for treatment of sepsis. Recently, we found that carbon monoxide (CO) can reduce HMGB1 levels in septic animal models. Here, we tried to elucidate the molecular machinery of how CO inhibits HMGB1 release in toll-like receptor (TLR)-activated macrophages.

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Objectives: While other cytokines are known to be associated with otitis media with effusion (OME), the involvement of heat shock protein 70 (HSP70) in middle ear effusion (MEE) is unknown. This study was undertaken to investigate the possibility of there being a HSP70 expression in human MEE and to determine its potential role as a cytokine in OME.

Methods: The levels of HSP70, tumor necrosis factor-alpha and interleukin-1beta were measured by enzyme-linked immunosorbent assay in the effusion of different groups of OME patient following collection of the MEE using our new collection system.

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Increased expression of farnesyl diphosphate synthase (FPPS) by stable transfection appeared to attenuate paclitaxel-induced apoptotic cell death in human glioblastoma U87MG cells. The present results suggest that the apoptotic functions of p53 and c-Jun N-terminal kinase (JNK) are affected by FPPS. Farnesyl diphosphate, a catalytic product of FPPS, also attenuated mentioned paclitaxel-induced apoptotic cell death.

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Objective: To evaluate the effect of amantadine on corneal endothelial cells in subjects with Parkinson's disease.

Design: Cross-sectional study.

Participants: A total of 169 subjects (169 eyes) taking amantadine orally for Parkinson's disease and the same number of age- and gender-matched controls.

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Article Synopsis
  • A newborn baby with a rare form of Klinefelter syndrome (48,XXXY/46,XY mosaicism) presented with notable phenotypic abnormalities, including a cleft palate and low-set ears.
  • This case is the first documented instance linking this specific mosaicism to cleft palate, indicating a unique clinical presentation.
  • The findings highlight the importance of cytogenetic analysis in cases of cleft palate, suggesting it could be an indicator of underlying genetic conditions like variant Klinefelter syndrome.
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We developed three-dimensional electrospun silk fibroin (ESF) scaffolds with controllable pore size. The purpose of this study was to evaluate ESF scaffolds with pores (P-ESF) for bone regeneration via in vitro and in vivo studies, with a comparison to a commercially available porous three-dimensional polylactic acid (PLA) scaffold. P-ESF supported significantly higher proliferation and alkaline phosphatase activity of osteoblasts than PLA in vitro (p < 0.

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  • Inflammatory processes in vascular endothelial cells are crucial in the development of atherosclerosis.
  • Researchers examined the anti-inflammatory effects of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on treated human umbilical vein endothelial cells (HUVECs) to assess their heart-protecting potential.
  • The study found that EPA, DHA, and troglitazone reduced harmful inflammatory markers in a dose-dependent way, but low doses of EPA and DHA unexpectedly increased NF-kappaB activity in resting HUVECs, indicating potential negative effects at very low concentrations.
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Hyperglycemia, abnormal lipid and antioxidant profiles are the most usual complications in diabetes mellitus. Thus, in this study, we investigated the anti-diabetic and anti-oxidative effects of anthocyanins (ANT) from black soybean seed coats in streptozotocin (STZ)-induced diabetic rats. The administration of ANT markedly decreased glucose levels and improved heart hemodynamic function (left ventricular end diastolic pressure, +/-dp/dt parameters).

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Wound healing is a complex process that includes inflammation, tissue formation, and remodeling. While wound healing is accompanied by inflammatory reactions, chronic inflammation impairs acute wound healing. In this study, we investigated whether anthocyanins from black soybean seed coats could stimulate wound healing while preventing excessive inflammation.

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The effect of CO on the expression of iNOS and COX-2 was investigated by using a CO-releasing molecule (CORM)-2 in LPS-activated RAW 264.7 cells in vitro. Interestingly, CORM-2 significantly inhibited iNOS (NO) but not COX-2 (PGE(2)) expression.

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