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https://www.readbyqxmd.com/read/29343656/crispr-cas9-mediated-generation-of-obese-and-diabetic-mouse-models
#1
Jae-Il Roh, Junghoon Lee, Seong Uk Park, Young-Shin Kang, Jaehoon Lee, Ah-Reum Oh, Dong Joon Choi, Ji-Young Cha, Han-Woong Lee
Mouse models of obesity (ob/ob) and diabetes (db/db) in which the leptin (Lep) and Leptin receptor (Lepr) genes have been mutated, respectively, have contributed to a better understanding of human obesity and type 2 diabetes and to the prevention, diagnosis, and treatment of these metabolic diseases. In this study, we report the first CRISPR-Cas9-induced Lep and Lepr KO mouse models by co-microinjection of Cas9 mRNA and sgRNAs that specifically targeted Lep or Lepr in C57BL/6J embryos. Our newly established Lep and Lepr knockout (KO) mouse models showed phenotypic disorders nearly identical to those found in ob/ob and db/db mice, such as an increase in body weight, hyperglycemia, and hepatic steatosis...
January 16, 2018: Experimental Animals
https://www.readbyqxmd.com/read/29301188/a-boy-with-46-x-mar-presenting-gynecomastia-and-short-stature
#2
Ki Eun Kim, Ye Jin Kim, Mo Kyoung Jung, Hyun-Wook Chae, Ah Reum Kwon, Woo Jung Lee, Duk-Hee Kim, Ho-Seong Kim
A 15-year-old boy was referred due to gynecomastia and short stature. He was overweight and showed the knuckle-dimple sign on the left hand, a short fourth toe on the left foot, and male external genitalia with a small phallus. His levels of estradiol and follicle-stimulating hormone were increased, and his testosterone concentration was normal. Other hormonal tests were within the normal range. Radiographs showed short fourth and fifth metacarpals and fourth metatarsal bones. The karyotype was reported as 46,X,+mar, and the marker chromosome was shown to originate from the Y chromosome, which was identified by fluorescence in situ hybridization...
December 2017: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/29296565/optimization-of-ultrasound-assisted-extraction-of-glycyrrhizic-acid-from-licorice-using-response-surface-methodology
#3
Seol Jang, A Yeong Lee, A Reum Lee, Goya Choi, Ho Kyoung Kim
Background: The present study optimized ultrasound-assisted extraction conditions to maximize extraction yields of glycyrrhizic acid from licorice. Methods: The optimal extraction temperature (X1), extraction time (X2), and methanol concentration (X3) were identified using response surface methodology (RSM). A central composite design (CCD) was used for experimental design and analysis of the results to obtain the optimal processing parameters. Results: Statistical analyses revealed that three variables and the quadratic of X1, X2, and X3 had significant effects on the yields and were followed by significant interaction effects between the variables of X2 and X3 (p < 0...
December 2017: Integrative Medicine Research
https://www.readbyqxmd.com/read/29274812/cytoprotective-dihydronaphthalenones-from-the-wood-of-catalpa-ovata
#4
Yun-Seo Kil, Yang Kang So, Min Jung Choi, Ah-Reum Han, Chang Hyun Jin, Eun Kyoung Seo
Three previously undescribed dihydronaphthalenones, 7-hydroxycatalponol, (4S)-3,4-dihydro-4-hydroxy-2-[(2R)-2,3-dihydroxy-3-methylbutylidene]naphthalen-1(2H)-one, and (6S)-5,6-dihydro-6-hydroxy-2,2-dimethyl-2H-benzo[h]chromen-4(3H)-one and one phthalide, (±)-3-(5-hydroxy-5-methyl-2-oxohex-3-en-1-yl)isobenzofuran-1(3H)-one, were isolated from the wood of Catalpa ovata G. Don (Bignoniaceae), together with six known compounds. The structures of the previously undescribed compounds were elucidated by interpretation of 1D and 2D NMR data...
December 21, 2017: Phytochemistry
https://www.readbyqxmd.com/read/29248443/molecular-cloning-and-functional-characterization-of-three-terpene-synthases-from-unripe-fruit-of-black-pepper-piper-nigrum
#5
Zhehao Jin, Moonhyuk Kwon, Ah-Reum Lee, Dae-Kyun Ro, Juraithip Wungsintaweekul, Soo-Un Kim
To identify terpene synthases (TPS) responsible for the biosynthesis of the sesquiterpenes that contribute to the characteristic flavors of black pepper (Piper nigrum), unripe peppercorn was subjected to the Illumina transcriptome sequencing. The BLAST analysis using amorpha-4,11-diene synthase as a query identified 19 sesquiterpene synthases (sesqui-TPSs), of which three full-length cDNAs (PnTPS1 through 3) were cloned. These sesqui-TPS cDNAs were expressed in E. coli to produce recombinant enzymes for in vitro assays, and also expressed in the engineered yeast strain to assess their catalytic activities in vivo...
December 14, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29233137/rational-modification-of-substrate-binding-site-by-structure-based-engineering-of-a-cellobiose-2-epimerase-in-caldicellulosiruptor-saccharolyticus
#6
Ah-Reum Park, Jin-Sook Kim, Seung-Won Jang, Young-Gyun Park, Bong-Seong Koo, Hyeon-Cheol Lee
BACKGROUND: Lactulose, a synthetic disaccharide, has received increasing interest due to its role as a prebiotic, specifically proliferating Bifidobacilli and Lactobacilli and enhancing absorption of calcium and magnesium. The use of cellobiose 2-epimerase (CE) is considered an interesting alternative for industrial production of lactulose. CE reversibly converts D-glucose residues into D-mannose residues at the reducing end of unmodified β-1,4-linked oligosaccharides, including β-1,4-mannobiose, cellobiose, and lactose...
December 12, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/29220692/plag-alleviates-chemotherapy-induced-thrombocytopenia-via-promotion-of-megakaryocyte-erythrocyte-progenitor-differentiation-in-mice
#7
Ha-Reum Lee, Nina Yoo, Jinseon Jeong, Ki-Young Sohn, Sun Young Yoon, Jae Wha Kim
Previously, PLAG (1-palmitoyl-2-linoleoyl-3-acetyl-rac-glycerol, acetylated diglyceride) was reported to have an effect on the proliferation of hematopoietic stem cells (HSCs) or to contribute to the prevention of chemotherapy-induced neutropenia. In this study, we examined the role of PLAG in the differentiation of bone marrow cells from HSCs into progenitor cells in mice. After 15days, the lineage-negative cells, especially megakaryocyte/erythrocyte progenitors (MEP), were significantly increased in mice that received daily PLAG administration compared to those in the untreated mice...
October 10, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/29215443/scaffold-free-bone-regeneration-using-platelet-rich-fibrin-in-calvarial-defect-model
#8
Yeo Reum Jeon, Mi Jung Kim, Yong Oock Kim, Tai Suk Roh, Won Jai Lee, Eun Hye Kang, In Sik Yun
Bone regeneration is a complex process influenced by various physiological factors. Platelet-rich plasma (PRP) contains many growth factors and has shown osteogenic effects. The PRP is usually activated before use. However, the authors showed that nonactivated PRP (nPRP) and activated PRP have comparable osteogenic effects in the previous study. Generally, a scaffold has been needed for the application of PRP in the cranial defect model. In this study, the authors aimed to compare the performance of scaffold free platelet-rich fibrin (PRF) to nPRP as an adjuvant for bone regeneration...
December 6, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29209455/acute-and-13-week-subchronic-toxicological-evaluations-of-turanose-in-mice
#9
Joo-Yeon Chung, Jihye Lee, Daeyeon Lee, Eunju Kim, Jae-Ho Shin, Pu Reum Seok, Sang-Ho Yoo, Yuri Kim
BACKGROUND/OBJECTIVES: Turanose, α-D-glucosyl-(1→3)-α-D-fructose, is a sucrose isomer which naturally exists in honey. To evaluate toxicity of turanose, acute and subchronic oral toxicity studies were conducted with ICR mice. MATERIALS AND METHODS: For the acute oral toxicity study, turanose was administered as a single oral dose [10 g/kg body weight (b.w.)]. In the subchronic toxicity study, ICR mice were administered 0, 1.75, 3.5, and 7 g/kg b.w. doses of turanose daily for 13 weeks...
December 2017: Nutrition Research and Practice
https://www.readbyqxmd.com/read/29205291/interactive-effects-of-seizure-frequency-and-lateralization-on-intratemporal-effective-connectivity-in-temporal-lobe-epilepsy
#10
Chang-Hyun Park, Yun Seo Choi, Hyeon Jin Kim, Hwa-Kyung Chung, A-Reum Jung, Jeong Hyun Yoo, Hyang Woon Lee
OBJECTIVE: Patients with temporal lobe epilepsy (TLE) show brain connectivity changes in association with cognitive impairment. Seizure frequency and lateralization are 2 important clinical factors that characterize epileptic seizures. In this study, we sought to examine an interactive effect of the 2 seizure factors on intratemporal effective connectivity based on resting-state functional magnetic resonance imaging (rsfMRI) in patients with TLE. METHODS: For rsfMRI data acquired from 48 TLE patients and 45 healthy controls, we applied stochastic dynamical causal modeling to infer effective connectivity between 3 medial temporal lobe (MTL) regions, including the hippocampus (Hipp), parahippocampal gyrus (PHG), and amygdala (Amyg), ipsilateral to the seizure focus...
December 4, 2017: Epilepsia
https://www.readbyqxmd.com/read/29200862/association-between-serum-cystatin-c-and-bone-mineral-density-in-korean-adults
#11
Dongwon Yi, Ah Reum Khang, Hye Won Lee, Seok Man Son, Yang Ho Kang
Background: Serum cystatin C has been known as a novel marker of preclinical renal dysfunction, and higher cystatin C levels are associated with increased risks of hip and nonvertebral fractures. However, there are few reports on the association between serum cystatin C and bone mineral density (BMD), especially in the Asian population. We evaluated the association between cystatin C levels and BMD of the spine and hip in Korean adults. Methods: A cross-sectional study was performed in 865 Korean adults (325 men and 540 women) who participated in a comprehensive medical examination program and underwent bone densitometry...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/29182094/origami-wheel-transformer-a-variable-diameter-wheel-drive-robot-using-an-origami-structure
#12
Dae-Young Lee, Sa-Reum Kim, Ji-Suk Kim, Jae-Jun Park, Kyu-Jin Cho
A wheel drive mechanism is simple, stable, and efficient, but its mobility in unstructured terrain is seriously limited. Using a deformable wheel is one of the ways to increase the mobility of a wheel drive robot. By changing the radius of its wheels, the robot becomes able to pass over not only high steps but also narrow gaps. In this article, we propose a novel design for a variable-diameter wheel using an origami-based soft robotics design approach. By simply folding a patterned sheet into a wheel shape, a variable-diameter wheel was built without requiring lots of mechanical parts and a complex assembly process...
June 2017: Soft Robotics
https://www.readbyqxmd.com/read/29146956/electrical-analysis-of-c-si-cgse-monolithic-tandem-solar-cells-by-using-a-cell-selective-light-absorption-scheme
#13
Ah Reum Jeong, Sung Bin Choi, Won Mok Kim, Jong-Keuk Park, Jihye Choi, Inho Kim, Jeung-Hyun Jeong
A monolithic tandem solar cell consisting of crystalline Si (c-Si)/indium tin oxide (ITO)/CuGaSe2 (CGSe) was demonstrated by stacking a CGSe solar cell on a c-Si/ITO solar cell to obtain a photovoltaic conversion efficiency of about 10%. Electrical analyses based on cell-selective light absorption were applied to individually characterize the photovoltaic performances of the top and bottom subcells. Illumination at a frequency that could be absorbed only by a targeted top or bottom subcell permitted measurement of the open-circuit voltage of the target subcell and the shunt resistance of the non-target subcell...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29145719/maintained-mpf-level-after-oocyte-vitrification-improves-embryonic-development-after-ivf-but-not-after-somatic-cell-nuclear-transfer
#14
Ji I Baek, Dong-Won Seol, Ah-Reum Lee, Woo Sik Lee, Sook-Young Yoon, Dong Ryul Lee
Levels of maturation-promoting factor (MPF) in oocytes decline after vitrification, and this decline has been suggested as one of the main causes of low developmental competence resulting from cryoinjury. Here, we evaluated MPF activity in vitrified mouse eggs following treatment with caffeine, a known stimulator of MPF activity, and/or the proteasome inhibitor MG132. Collected MII oocytes were vitrified and divided into four groups: untreated, 10 mM caffeine (CA), 10 μM MG132 (MG), and 10 mM caffeine +10 μM MG132 (CA+MG)...
November 16, 2017: Molecules and Cells
https://www.readbyqxmd.com/read/29142159/systemic-cytokine-response-in-pigs-infected-orally-with-a-lawsonia-intracellularis-isolate-of-south-korean-origin
#15
Jung-Yong Yeh, A-Reum Ga
In the swine industry, Lawsonia intracellularis is one of the main enteric pathogens; it causes acute intestinal hemorrhage (proliferative hemorrhagic enteropathy) in naïve adult pigs and a wasting disease (proliferative enteropathy) in growing pigs. Among many kinds of cytokines, interferon-γ (IFN-γ) has previously been reported to play a significant role in limiting intracellular infection and increasing cellular proliferation associated with L. intracellularis. However, the levels of various circulating inflammatory cytokines, including IFN-γ, in animals infected with L...
November 15, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29135478/contralateral-involvement-of-congenital-muscular-torticollis-and-clavicular-fracture
#16
Shin-Young Yim, Kihong Chang, Ah-Reum Ahn, Eun Ji Park, Jongwoo Kim
Congenital muscular torticollis (CMT) is known to concur with some conditions such as developmental dysplasia of the hip or brachial plexus injury, which gives us some insights for pathogenesis of CMT. While clavicular fracture is the most common fracture in newborns, little is known about concurrence of CMT and clavicular fracture. Our clinical experience led us to realize that concurrence of CMT and clavicular fracture tended to occur on the contralateral side for each other rather than the ipsilateral side...
November 10, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29109910/effects-of-graded-concentrations-of-supplemental-lead-on-lead-concentrations-in-tissues-of-pigs-and-prediction-equations-for-estimating-dietary-lead-intake
#17
Kondreddy Eswar Reddy, Kyu Ree Park, Sung Dae Lee, Ji-Hyock Yoo, Ah Reum Son, Hyun-Jung Lee
The objectives of this experiment were to determine the effects of graded dietary lead (Pb) concentrations on body weight and Pb concentrations in blood, hair, soft tissues, and urine from pigs and to generate equations for estimating daily Pb intake. Sixteen barrows with initial body weight 36.3 kg (standard deviation = 2.3) were allotted to four dietary treatments that consisted of graded supplemental Pb concentrations (0, 10, 25, and 250 mg/kg of diet). Daily feed allowances for each pig were 1 kg for first two weeks and 2 kg for last two weeks...
2017: PeerJ
https://www.readbyqxmd.com/read/29075791/anticancer-effects-of-methanol-extract-of-myrmecodia-platytyrea-becc-leaves-against-human-hepatocellular-carcinoma-cells-via-inhibition-of-erk-and-stat3-signaling-pathways
#18
Anna Ju, Young-Chang Cho, Ba Reum Kim, Sewoong Lee, Hien Thi Thu Le, Huong Lan Vuong, Sayeon Cho
Myrmecodia platytyrea Becc., a member of the Rubiaceae family, is found throughout Southeast Asia and has been traditionally used to treat cancer. However, there is limited pharmacological information on this plant. We investigated the anticancer effects of the methanol extract of Myrmecodia platytyrea Becc. leaves (MMPL) and determined the molecular mechanisms underlying the effects of MMPL on metastasis in human hepatocellular carcinoma (HCC) cells. MMPL dose-dependently inhibited cell migration and invasion in SK‑Hep1 and Huh7 cells...
October 24, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/29072634/the-analysis-of-a-frequent-tmprss3-allele-containing-p-v116m-and-p-v291l-in-a-cis-configuration-among-deaf-koreans
#19
Ah Reum Kim, Juyong Chung, Nayoung K D Kim, Chung Lee, Woong-Yang Park, Doo-Yi Oh, Byung Yoon Choi
We performed targeted re-sequencing to identify the genetic etiology of early-onset postlingual deafness and encountered a frequent TMPRSS3 allele harboring two variants in a cis configuration. We aimed to evaluate the pathogenicity of the allele. Among 88 cochlear implantees with autosomal recessive non-syndromic hearing loss, subjects with GJB2 and SLC26A4 mutations were excluded. Thirty-one probands manifesting early-onset postlingual deafness were sorted. Through targeted re-sequencing, we detected two families with a TMPRSS3 mutant allele containing p...
October 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29067444/anti%C3%A2-inflammatory-effects-on-murine-macrophages-of-ethanol-extracts-of-lygodium-japonicum-spores-via-inhibition-of-nf%C3%A2-%C3%AE%C2%BAb-and-p38
#20
Young-Chang Cho, Ba Reum Kim, Hien Thi Thu Le, Sayeon Cho
The spores of Lygodium japonicum (Thunb.) Sw. (L. japonicum) have been used in traditional Chinese medicine for the treatment of various inflammatory diseases. However, the molecular mechanisms underlying their anti‑inflammatory effects have yet to be elucidated. In the present study, we investigated the anti‑inflammatory effects of ethanol extracts of L. japonicum spores (ELJ) by measuring the production of inflammatory mediators, and explored the molecular mechanisms underlying the effects of ELJ in murine macrophages in vitro using immunoblotting analyses...
October 2017: Molecular Medicine Reports
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