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Search Results: 1 - 10 of 71520 matches for " Yu-Mi Park "
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Sarcopenia as a Determinant of Blood Pressure in Older Koreans: Findings from the Korea National Health and Nutrition Examination Surveys (KNHANES) 2008–2010
Kyungdo Han, Yu-Mi Park, Hyuk-Sang Kwon, Seung-Hyun Ko, Seung-Hwan Lee, Hyeon Woo Yim, Won-Chul Lee, Yong Gyu Park, Mee Kyoung Kim, Yong-Moon Park
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0086902
Abstract: Background Blood pressure (BP) is directly and causally associated with body size in the general population. Whether muscle mass is an important factor that determines BP remains unclear. Objective To investigate whether sarcopenia is associated with hypertension in older Koreans. Participants We surveyed 2,099 males and 2,747 females aged 60 years or older. Measurements Sarcopenia was defined as an appendicular skeletal muscle mass divided by body weight (ASM/Wt) that was <1 SD below the gender-specific mean for young adults. Obesity was defined as a body mass index (BMI) ≥25 kg/m2. Subjects were divided into four groups based on presence or absence of obesity or sarcopenia. Hypertension was defined as a systolic BP (SBP) ≥140 mmHg, a diastolic BP (DBP) ≥90 mmHg, or a self-reported current use of antihypertensive medications. Results The overall prevalence of hypertension in the four groups was as follows 49.7% for non-obese non-sarcopenia, 60.9% for non-obese sarcopenia, 66.2% for obese non-sarcopenia and 74.7% for obese sarcopenia. After adjustment for age, gender, regular activity, current smoking and alcohol use, the odds ratio (OR) for having hypertension was 1.5 (95% confidence interval (CI) = 1.23–1.84) in subjects in the non-obese sarcopenia group, 2.08 (95% CI = 1.68–2.57) in the obese non-sarcopenia group and 3.0 (95% CI = 2.48–3.63) in the obese sarcopenia group, compared with the non-obese non-sarcopenia group (p for trend <0.001). Controlling further for body weight and waist circumference did not change the association between hypertension and sarcopenia. The association between sarcopenia and hypertension was more robust in the subjects with diabetes mellitus. Conclusion Body composition beyond BMI has a considerable impact on hypertension in elderly Koreans. Subjects with sarcopenic obesity appear to have a greater risk of hypertension than simply obese or sarcopenia subjects.
Persistent Catheter-Related Staphylococcus aureus Bacteremia after Catheter Removal and Initiation of Antimicrobial Therapy
Ki-Ho Park, Yu-Mi Lee, Hyo-Lim Hong, Tark Kim, Hyun Jung Park, So-Youn Park, Song Mi Moon, Yong Pil Chong, Sung-Han Kim, Sang-Oh Lee, Sang-Ho Choi, Jin-Yong Jeong, Mi-Na Kim, Jun Hee Woo, Yang Soo Kim
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0046389
Abstract: Objectives Catheter-related Staphylococcus aureus bacteremia (CRSAB) occasionally persists despite catheter removal and initiation of appropriate antimicrobial therapy. The aim of this study was to determine the incidence, risk factors, and outcomes of persistent CRSAB after catheter removal and initiation of antimicrobial therapy. Methods Consecutive patients with CRSAB were prospectively included from over a 41-month period. We compared the clinical features, 40 bacterial virulence genes, and outcomes between patients with persistent CRSAB (i.e., bacteremia for >3 days after catheter removal and initiation of appropriate antimicrobial therapy) and non-persistent CRSAB. Results Among the 220 episodes of CRSAB, the catheter was kept in place in 17 (6%) and removed in 203 (94%) cases. In 43 (21%) of the 203 episodes, bacteremia persisted for >3 days after catheter removal and initiation of antimicrobial therapy. Methicillin resistance (Odds ratio [OR], 9.01; 95% confidence interval [CI], 3.05–26.61; P<0.001), non-catheter prosthetic devices (OR, 5.37; 95% CI, 1.62–17.80; P = 0.006), and renal failure (OR, 3.23; 95% CI, 1.48–7.08; P = 0.003) were independently associated with persistent CRSAB. Patients with persistent CRSAB were more like to experience complication than were those with non-persistent CRSAB (72% vs. 15%; P<0.001). Among all episodes due to methicillin-resistant S. aureus, persistent CRSAB isolates were associated with accessory gene regulator (agr) group II (P = .04), but presence of other bacterial virulence genes, distribution of vancomycin minimum inhibitory concentration distribution, and frequency of vancomycin heteroresistance did not differ between the groups. Conclusions In patients with CRSAB, bacteremia persisted in 21% of cases despite catheter removal and initiation of antimicrobial therapy. Methicillin resistance, renal failure, and non-catheter prosthetic devices were independent risk factors for persistent CRSAB, which was associated with a higher rate of complications.
Anomalous Stress-Induced Hump Effects in Amorphous Indium Gallium Zinc Oxide TFTs
Ga-Won Lee,Yu-Mi Kim,Kwang-Seok Jeong,Ho-Jin Yun
Transactions on Electrical and Electronic Materials , 2012,
Abstract: In this paper, we investigated the anomalous hump in the bottom gate staggered a-IGZO TFTs. During the positivebias stress, a positive threshold voltage shift was observed in the transfer curve and an anomalous hump occurred asthe stress time increased. The hump became more serious in higher gate bias stress while it was not observed underthe negative bias stress. The analysis of constant gate bias stress indicated that the anomalous hump was influencedby the migration of positively charged mobile interstitial zinc ion towards the top side of the a-IGZO channel layer.
The Volatile Anesthetic Isoflurane Increases Endothelial Adenosine Generation via Microparticle Ecto-5′-Nucleotidase (CD73) Release
Mihwa Kim, Ahrom Ham, Katelyn Yu-Mi Kim, Kevin M. Brown, H. Thomas Lee
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0099950
Abstract: Endothelial dysfunction is common in acute and chronic organ injury. Isoflurane is a widely used halogenated volatile anesthetic during the perioperative period and protects against endothelial cell death and inflammation. In this study, we tested whether isoflurane induces endothelial ecto-5′-nucleotidase (CD73) and cytoprotective adenosine generation to protect against endothelial cell injury. Clinically relevant concentrations of isoflurane induced CD73 activity and increased adenosine generation in cultured human umbilical vein or mouse glomerular endothelial cells. Surprisingly, isoflurane-mediated induction of endothelial CD73 activity occurred within 1 hr and without synthesizing new CD73. We determined that isoflurane rapidly increased CD73 containing endothelial microparticles into the cell culture media. Indeed, microparticles isolated from isoflurane-treated endothelial cells had significantly higher CD73 activity as well as increased CD73 protein. In vivo, plasma from mice anesthetized with isoflurane had significantly higher endothelial cell-derived CD144+ CD73+ microparticles and had increased microparticle CD73 activity compared to plasma from pentobarbital-anesthetized mice. Supporting a critical role of CD73 in isoflurane-mediated endothelial protection, a selective CD73 inhibitor (APCP) prevented isoflurane-induced protection against human endothelial cell inflammation and apoptosis. In addition, isoflurane activated endothelial cells Rho kinase evidenced by myosin phosphatase target subunit-1 and myosin light chain phosphorylation. Furthermore, isoflurane-induced release of CD73 containing microparticles was significantly attenuated by a selective Rho kinase inhibitor (Y27632). Taken together, we conclude that the volatile anesthetic isoflurane causes Rho kinase-mediated release of endothelial microparticles containing preformed CD73 and increase adenosine generation to protect against endothelial apoptosis and inflammation.
Associations between Organochlorine Pesticides and Vitamin D Deficiency in the U.S. Population
Jin-Hoon Yang, Yu-Mi Lee, Sang-Geun Bae, David R. Jacobs, Duk-Hee Lee
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030093
Abstract: Background Recently low dose organochlorine (OC) pesticides have been strongly linked to various chronic diseases including diabetes and cardiovascular diseases. Both field and animal studies have suggested a possibility that persistent lipophilic chemicals like OC pesticides can cause vitamin D deficiency, but there have been no human studies of exposure to any chemical as a possible cause of vitamin D deficiency. This study was performed to examine if serum concentrations of OC pesticides were associated with serum concentrations of 25-hydroxyvitamin D (25(OH)D) in the U.S. general population. Methodology/Principal Findings Cross-sectional associations of serum OC pesticides with serum 25(OH)D were investigated in 1,275 subjects aged ≥20 in the National Health and Nutrition Examination Survey(NHANES), 2003–2004. We selected 7 OC pesticides detectable in ≥80% of participants. Among the 7 OC pesticides, p,p′-DDT (β = ?0.022, P<0.01), p,p′-DDE (β = ?0.018, P = 0.04), and β-hexachlorocyclohexane (β = ?0.022, P = 0.02) showed significant inverse associations with serum 25(OH)D levels. When study subjects were stratified by age, race, and the presence of various chronic diseases, p,p′-DDT showed consistent inverse associations in all subgroups, although stronger associations tended to be observed among subjects with old age, white race, or chronic diseases. Conclusion/Significance The current study suggests that the background exposure to some OC pesticides leads to vitamin D deficiency in human. Considering the importance of vitamin D deficiency in the development of chronic diseases, chemical exposure as a possible cause of vitamin D deficiency should be evaluated in prospective and experimental studies.
Protease-Activated Receptor 2 Mediates Mucus Secretion in the Airway Submucosal Gland
Hyun Jae Lee,Yu-Mi Yang,Kyubo Kim,Dong Min Shin,Joo-Heon Yoon,Hyung-Ju Cho,Jae Young Choi
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0043188
Abstract: Protease-activated receptor 2 (PAR2), a G protein-coupled receptor expressed in airway epithelia and smooth muscle, plays an important role in airway inflammation. In this study, we demonstrated that activation of PAR2 induces mucus secretion from the human airway gland and examined the underlying mechanism using the porcine and murine airway glands. The mucosa with underlying submucosal glands were dissected from the cartilage of tissues, pinned with the mucosal side up at the gas/bath solution interface of a physiological chamber, and covered with oil so that secretions from individual glands could be visualized as spherical bubbles in the oil. Secretion rates were determined by optical monitoring of the bubble diameter. The Ca2+-sensitive dye Fura2-AM was used to determine intracellular Ca2+ concentration ([Ca2+]i) by means of spectrofluorometry. Stimulation of human tracheal mucosa with PAR2-activating peptide (PAR2-AP) elevated intracellular Ca2+ and induced glandular secretion equal to approximately 30% of the carbachol response in the human airway. Porcine gland tissue was more sensitive to PAR2-AP, and this response was dependent on Ca2+ and anion secretion. When the mouse trachea were exposed to PAR2-AP, large amounts of secretion were observed in both wild type and ΔF508 cystic fibrosis transmembrane conductance regulator mutant mice but there is no secretion from PAR-2 knock out mice. In conclusion, PAR2-AP is an agonist for mucus secretion from the airway gland that is Ca2+-dependent and cystic fibrosis transmembrane conductance regulator-independent.
Argon: Neuroprotection in in vitro models of cerebral ischemia and traumatic brain injury
Philip D Loetscher, Jan Rossaint, Rolf Rossaint, Joachim Weis, Michael Fries, Astrid Fahlenkamp, Yu-Mi Ryang, Oliver Grottke, Mark Coburn
Critical Care , 2009, DOI: 10.1186/cc8214
Abstract: Organotypic hippocampal slice cultures from mice pups were subjected to either oxygen-glucose deprivation or to a focal mechanical trauma and subsequently treated with three different concentrations (25, 50 and 74%) of argon immediately after trauma or with a two-or-three-hour delay. After 72 hours of incubation tissue injury assessment was performed using propidium iodide, a staining agent that becomes fluorescent when it diffuses into damaged cells via disintegrated cell membranes.We could show argon's neuroprotective effects at different concentrations when applied directly after oxygen-glucose deprivation or trauma. Even three hours after application, argon was still neuroprotective.Argon showed a neuroprotective effect in both in vitro models of oxygen-glucose deprivation and traumatic brain injury. Our promising results justify further in vivo animal research.The first biological effects of argon were demonstrated as early as 1939 [1]. Behnke et al. described the narcotic effects of argon as experienced by deep sea divers at high pressures. Half a century later Soldatov and co-workers [2] were the first to show argon's protective effects under hypoxic conditions. Thereafter, it was reported that argon shields hair cells from ototoxic process [3] and protects cell cultures from ischemia [4]. In contrast to argon, xenon's organ protective effects have been investigated in various settings and models, ranging from cell cultures to clinical trials. Xenon has proven to be a safe anaesthetic agent and xenon's organoprotective properties have been demonstrated in many fields [5-14].Stroke and traumatic brain injury (TBI) are two very common causes of death and disability worldwide and create a significant economic and social burden [15-17]. While the acute treatment of stroke today is highly standardized and secondary prevention is effective, an efficient protection of the cells at risk in the penumbra is lacking. This is particularly evident in regard to TBI. Althou
Solulin reduces infarct volume and regulates gene-expression in transient middle cerebral artery occlusion in rats
Yu-Mi Ryang, Jon Dang, Markus Kipp, Karl-Uwe Petersen, Astrid V Fahlenkamp, Jens Gempt, Dominik Wesp, Rolf Rossaint, Cordian Beyer, Mark Coburn
BMC Neuroscience , 2011, DOI: 10.1186/1471-2202-12-113
Abstract: Male SD rats were subjected to 2 hrs of transient middle cerebral artery occlusion (tMCAO). Rats treated with Solulin intravenously shortly before reperfusion were compared to rats receiving normal saline i.v. with respect to infarct volumes, neurological deficits and mortality. Gene expression of IL-6, IL-1β, TNF-α, MMP-9, CD11B and GFAP were semiquantitatively analyzed by rtPCR of the penumbra.24 hrs after reperfusion, rats were neurologically tested, euthanized and infarct volumes determined. Solulin significantly reduced mean total (p = 0.001), cortical (p = 0.002), and basal ganglia (p = 0.036) infarct volumes. Hippocampal infarct volumes (p = 0.191) were not significantly affected. Solulin significantly downregulated the expression of IL-1β (79%; p < 0.001), TNF-α (59%; p = 0.001), IL-6 (47%; p = 0.04), and CD11B (49%; p = 0.001) in the infarcted cortex compared to controls.Solulin reduced mean total, cortical and basal ganglia infarct volumes and regulated a subset of cytokines and proteases after tMCAO suggesting the potency of this compound for therapeutic interventions.Stroke is a major cause of morbidity and mortality in the Western civilization. Roughly 60% of ischemic strokes are attributable to large-artery occlusion by thrombembolism. Complete absence of perfusion results in irreversible brain damage and neuronal loss in the stroke core. However, the surrounding penumbra contains functionally impaired, yet reversibly damaged neurons which are potentially salvageable. The goal in modern stroke therapy, therefore, is to protect the penumbra. To date, the only approved drug for lysis therapy is recombinant tissue plasminogen activator (rtPA) which has shown significant benefit in patient outcome when given up to 4.5 hours of onset. Less than 10% of all acute stroke patients are eligible for this treatment. No clinical trial has been able to demonstrate clear beneficial effects in respect to improvement of short- or long-term outcome after anticoagulatory
A Cancer-Indicative microRNA Pattern in Normal Prostate Tissue
Olaf J. C. Hellwinkel,Christina Sellier,Yu-Mi Jessica Sylvester,Jan C. Brase,Hendrik Isbarn,Andreas Erbersdobler,Thomas Steuber,Holger Sültmann,Thorsten Schlomm,Christina Wagner
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14035239
Abstract: We analyzed the levels of selected micro-RNAs in normal prostate tissue to assess their potential to indicate tumor foci elsewhere in the prostate. Histologically normal prostate tissue samples from 31 prostate cancer patients and two cancer negative control groups with either unsuspicious or elevated prostate specific antigen (PSA) levels (14 and 17 individuals, respectively) were analyzed. Based on the expression analysis of 157 microRNAs in a pool of prostate tissue samples and information from data bases/literature, we selected eight microRNAs for quantification by real-time polymerase chain reactions (RT-PCRs). Selected miRNAs were analyzed in histologically tumor-free biopsy samples from patients and healthy controls. We identified seven microRNAs (miR-124a, miR-146a & b, miR-185, miR-16 and let-7a & b), which displayed significant differential expression in normal prostate tissue from men with prostate cancer compared to both cancer negative control groups. Four microRNAs (miR-185, miR-16 and let-7a and let-7b) remained to significantly discriminate normal tissues from prostate cancer patients from those of the cancer negative control group with elevated PSA levels. The transcript levels of these microRNAs were highly indicative for the presence of cancer in the prostates, independently of the PSA level. Our results suggest a microRNA-pattern in histologically normal prostate tissue, indicating prostate cancer elsewhere in the organ.
Targeting Strategies for Multifunctional Nanoparticles in Cancer Imaging and Therapy
Mi Kyung Yu, Jinho Park, Sangyong Jon
Theranostics , 2012,
Abstract: Nanomaterials offer new opportunities for cancer diagnosis and treatment. Multifunctional nanoparticles harboring various functions including targeting, imaging, therapy, and etc have been intensively studied aiming to overcome limitations associated with conventional cancer diagnosis and therapy. Of various nanoparticles, magnetic iron oxide nanoparticles with superparamagnetic property have shown potential as multifunctional nanoparticles for clinical translation because they have been used asmagnetic resonance imaging (MRI) constrast agents in clinic and their features could be easily tailored by including targeting moieties, fluorescence dyes, or therapeutic agents. This review summarizes targeting strategies for construction of multifunctional nanoparticles including magnetic nanoparticles-based theranostic systems, and the various surface engineering strategies of nanoparticles for in vivo applications.
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