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Han, Min-Su,Kim, Hyo-Jin,Wee, Hee-Jun,Lim, Kyung-Eun,Park, Na-Rae,Bae, Suk-Chul,van Wijnen, Andre J.,Stein, Janet L.,Lian, Jane B.,Stein, Gary S.,Choi, Je-Yong Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of cellular biochemistry Vol.110 No.1
<P>Cleidocranial dysplasia (CCD) is caused by haploinsufficiency in RUNX2 function. We have previously identified a series of RUNX2 mutations in Korean CCD patients, including a novel R131G missense mutation in the Runt-homology domain. Here, we examine the functional consequences of the RUNX2<SUP>R131G</SUP> mutation, which could potentially affect DNA binding, nuclear localization signal, and/or heterodimerization with core-binding factor-β (CBF-β). Immunofluorescence microscopy and western blot analysis with subcellular fractions show that RUNX2<SUP>R131G</SUP> is localized in the nucleus. Immunoprecipitation analysis reveals that heterodimerization with CBF-β is retained. However, precipitation assays with biotinylated oligonucleotides and reporter gene assays with RUNX2 responsive promoters together reveal that DNA-binding activity and consequently the transactivation of potential of RUNX2<SUP>R131G</SUP> is abrogated. We conclude that loss of DNA binding, but not nuclear localization or CBF-β heterodimerization, causes RUNX2 haploinsufficiency in patients with the RUNX2<SUP>R131G</SUP> mutation. Retention of specific functions including nuclear localization and binding to CBF-β of the RUNX2<SUP>R131G</SUP> mutation may render the mutant protein an effective competitor that interferes with wild-type function. J. Cell. Biochem. 110: 97–103, 2010. © 2010 Wiley-Liss, Inc.</P>
Metabolic control of primed human pluripotent stem cell fate and function by the miR-200c–SIRT2 axis
Cha, Young,Han, Min-Joon,Cha, Hyuk-Jin,Zoldan, Janet,Burkart, Alison,Jung, Jin Hyuk,Jang, Yongwoo,Kim, Chun-Hyung,Jeong, Ho-Chang,Kim, Byung-Gyu,Langer, Robert,Kahn, C. Ronald,Guarente, Leonard,Kim, K Nature Publishing Group 2017 NATURE CELL BIOLOGY Vol. No.
<P>A hallmark of cancer cells is the metabolic switch from oxidative phosphorylation (OXPHOS) to glycolysis, a phenomenon referred to as the 'Warburg effect', which is also observed in primed human pluripotent stem cells (hPSCs). Here, we report that downregulation of SIRT2 and upregulation of SIRT1 is a molecular signature of primed hPSCs and that SIRT2 critically regulates metabolic reprogramming during induced pluripotency by targeting glycolytic enzymes including aldolase, glyceraldehyde-3-phosphate dehydrogenase, phosphoglycerate kinase, and enolase. Remarkably, knockdown of SIRT2 in human fibroblasts resulted in significantly decreased OXPHOS and increased glycolysis. In addition, we found that miR-200c-5p specifically targets SIRT2, downregulating its expression. Furthermore, SIRT2 overexpression in hPSCs significantly affected energy metabolism, altering stem cell functions such as pluripotent differentiation properties. Taken together, our results identify the miR-200c-SIRT2 axis as a key regulator of metabolic reprogramming (Warburg-like effect), via regulation of glycolytic enzymes, during human induced pluripotency and pluripotent stem cell function.</P>
말의 그물막구멍포착 교정을 위한 소장 절제 및 문합 1례
황혜신,박철규,황준석,천용우,Janet Han,이인형 한국임상수의학회 2015 한국임상수의학회지 Vol.32 No.4
A 10-year-old gelding Warmblood weighing 560 kg was referred to J&C Equine Hospital with the history of hyperpnea, depression, pawing, and rolling for 7 hours. According to the results of clinical and ultrasound examination, it was considered that intestines were distended with thickened wall. The horse had been treated with lactated Ringers’ solution (14 L, IV), flunixin meglumine (1.1 mg/kg, IV), and mineral oil (1 L, PO), but he did not show any responses to those treatments. Exploratory laparotomy was performed and identified incarcerated small intestine through the epiploic foramen. The horse received resection and anastomosis of the entrapped small intestine. After surgery, the horse was treated with intensive postoperative care of fluid therapy (5 L with 20 mEq/L KCl, every 2 hours), flunixin meglumine (1.1 mg/kg, IV, sid), antibiotics (penicillin 22,000 IU/kg, IV, qid and gentamicin 6.6 mg/ kg, IV, sid), lidocaine constant rate infusion (bolus 1.3 mg/kg over 15 minutes then 0.05 mg/kg/minute), common nutritional supplements, nasogastric intubation every 2 hours and trunk bandage. Postoperative feeding program had started with small amount of hay every 4 hours and gradually increased to normal amount till 5 days. At 77 days after surgery, he showed sudden outbreak of colic and was euthanized. The causes of colic were small intestinal strangulation by passing through the mesenteric rents and postoperative adhesion between small intestines. According to the results, it is recommended to perform perioperative intensive care of horse with colic and to use several methods to prevent adhesions during abdominal surgery of horses.
Bae, Jae-Sung,Han, Hyung Soo,Youn, Dong-Ho,Carter, Janet E.,Modo, Michel,Schuchman, Edward H.,Jin, Hee Kyung Wiley (John WileySons) 2007 Stem Cells Vol.25 No.5
<P>Recent studies have shown that bone marrow-derived MSCs (BM-MSCs) improve neurological deficits when transplanted into animal models of neurological disorders. However, the precise mechanism by which this occurs remains unknown. Herein we demonstrate that BM-MSCs are able to promote neuronal networks with functional synaptic transmission after transplantation into Niemann-Pick disease type C (NP-C) mouse cerebellum. To address the mechanism by which this occurs, we used gene microarray, whole-cell patch-clamp recordings, and immunohistochemistry to evaluate expression of neurotransmitter receptors on Purkinje neurons in the NP-C cerebellum. Gene microarray analysis revealed upregulation of genes involved in both excitatory and inhibitory neurotransmission encoding subunits of the ionotropic glutamate receptors (alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid, AMPA) GluR4 and GABA(A) receptor beta2. We also demonstrated that BM-MSCs, when originated by fusion-like events with existing Purkinje neurons, develop into electrically active Purkinje neurons with functional synaptic formation. This study provides the first in vivo evidence that upregulation of neurotransmitter receptors may contribute to synapse formation via cell fusion-like processes after BM-MSC transplantation into mice with neurodegenerative disease. Disclosure of potential conflicts of interest is found at the end of this article.</P>
식품 매트릭스 중의 농약성분 확인을 위한 고감도이며 새로운 정성적 접근
안주현 ( Andrew An ),강미나 ( Janet Kang ),한정희 ( Jessica Han ),이권엽 ( Kwonyeob Lee ),권한순 ( Jordan Kwon ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
Consumer concerns and federal regulations make pesticide residue analysis an important component of ensuring food safety. Also with growing global trade as well as varying international regulations, the need for multi-analyte screening procedures to efficiently detect violating residues is ever increasing. It is desirable to rapidly and reliably screen samples for a large number of pesticides with sensitive and confirmatory methods as possible. Limitations may exist due to the complexity of sample matrices and differing physicochemical characteristics of contaminating compounds, thus requiring replication of work, to ensure all residues of interest can be targeted. This work reports the development of a screening method for the determination of multi-class and multi-residue pesticides from agricultural processes in complex foodstuffs. All solvent standards, matrix matched standards and sample extracts were analyzed using UPLC coupled with a high sensitivity tandem quadrupole mass spectrometer. Further enhancements in analytical efficiencies were achieved utilizing the functionality of the ESI source versus UniSpray, operated at atmospheric pressure. Exploiting the key functionality of the high velocity droplet stream, ionization efficiency is increased while extending the scope of multiclass analytes screened to excelled levels of detection in a single workflow. Also a novel confirmatory strategy (Product Ion Confirmation Scanning, PICS) was assessed to ensure the method that was acquired using multi reaction monitoring (MRM) on a tandem quadrupole mass spectrometer.
Invited Mini Review : Emerging roles of exosomes in cancer invasion and metastasis
( Young Hwa Soung ),( Thalia Nguyen ),( Hans Cao ),( Janet Lee ),( Jun Chung ) 생화학분자생물학회(구 한국생화학분자생물학회) 2016 BMB Reports Vol.49 No.1
Recent evidence has indicated that nano-sized vesicles called “exosomes” mediate the interaction between cancer cells and their microenvironment and play a critical role in the development of cancers. Exosomes contain cargo consisting of proteins, lipids, mRNAs, and microRNAs that can be delivered to different types of cells in nascent as well as distant locations. Cancer cell-derived exosomes (CCEs) have been identified in body fluids such as urine, plasma, and saliva from patients with cancer. Although their content depends on tumor type and stage, CCEs merit consideration as prognostic and diagnostic markers, as vehicles for drug delivery, and as potential therapeutic targets because they could transport various oncogenic elements. In this review, we summarize recent advances regarding the role of CCEs in cancer invasion and metastasis, as well as its potential clinical applications. [BMB Reports 2016; 49(1): 18-25]
Prevalence and treatment of gastric ulcers in Thoroughbred racehorses of Korea
Hyeshin Hwang,Hee-Jin Dong,Janet Han,Seongbeom Cho,Yongbaek Kim,Inhyung Lee 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.2
Background: Gastric ulcer is one of the prevalent diseases in racehorses. However, it has not been recognized as important in Korea, and drugs used to treat gastric ulcers are included in the doping test list, so they are not allowed to be administered to racehorses in training. Objectives: This study was performed 1) to investigate the prevalence and the severity of gastric ulcers in Thoroughbred racehorses in Korea, 2) to confirm the therapeutic effect of ranitidine and omeprazole, and 3) to compare the efficacy between ranitidine and omeprazole. Methods: Forty-nine horses were randomly recruited, and gastroscopy was performed within two days after racing. Twelve horses with a sum grade of five or higher were randomly assigned to two treatment groups. Seven horses were administered ranitidine, and five horses were administered omeprazole. Follow-up gastroscopy was scheduled within one to five days after finishing the treatment. Results: The prevalence of gastric ulcer in Korean Thoroughbred racehorses after racing was 100%, and the grade was more severe in the non-glandular region than in the pyloric region. There was no correlation between the severity of gastric ulcer in the two regions. Omeprazole had a greater therapeutic effect than ranitidine. Conclusions: This study shows the importance of recognizing gastric ulcers as an important factor, and omeprazole as a possible treatment option in Korea, as it has been removed from the list of prohibited substances for racehorses. Thus, the use of omeprazole is currently recommended until one day before the race.