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Han H, Chae H, Yun J, Kim H, Go SI, Lee W, Bae W, Cho S, Song EK. Ascites-derived circulating microRNAs as potential diagnostic biomarkers of gastric cancer-associated malignant ascites. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz239.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kondo T, Kawachi I, Onizuka Y, Hiramatsu K, Hase M, Yun J, Matta A, Torii S. Efficacy of dimethyl fumarate in Japanese multiple sclerosis patients: interim analysis of randomized, double-blind APEX study and its open-label extension. Mult Scler J Exp Transl Clin 2019; 5:2055217319864974. [PMID: 31391949 PMCID: PMC6669851 DOI: 10.1177/2055217319864974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 06/06/2019] [Accepted: 06/29/2019] [Indexed: 12/23/2022] Open
Abstract
Background Current data for the use of dimethyl fumarate (DMF) in Japanese patients with relapsing-remitting multiple sclerosis (RRMS) is limited. Objectives To assess the efficacy of DMF in Japanese patients with RRMS. Methods The phase 3, multinational APEX study (ClinicalTrials.gov identifier: NCT01838668) consisted of two parts: a 24-week double-blind part where subjects were randomized to receive DMF 240 mg or placebo twice daily in East Asian and Eastern European countries, and an open-label extension part where all subjects received DMF. The primary endpoint was the total number of new gadolinium-enhancing lesions in Weeks 12-24. In this interim analysis, we report efficacy data in the Japanese subgroup (DMF n = 56; placebo n = 58) over 72 weeks, including an extension phase. Results DMF reduced the total number of new gadolinium-enhancing lesions in Weeks 12-24 by 85% versus placebo (p < 0.0001). At Week 24, the annualized relapse rate was also reduced by 48% with DMF, versus placebo. DMF reduced the probability of relapse from Week 8 and was sustained. The number of gadolinium-enhancing lesions was maintained through 72 weeks. Conclusions DMF demonstrated sustained efficacy in this Japanese subgroup. The results were consistent with those observed in studies of DMF enrolling primarily Caucasian patients.
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Yun J, Cho B, Lim S. Risk factors of primary care clinic closure in Korea using nationwide data. Eur J Public Health 2018. [DOI: 10.1093/eurpub/cky214.267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Li Q, Qiu B, Liang W, Wang J, Hu W, Xu S, Lin S, López J, Chen N, Zhang T, Guo M, Zhao Y, Liu S, Liu Q, Guo J, Cai L, Wang S, Wang X, Zhang L, Rong T, Yu Z, Yun J, Wu G, Zhang L, Fang V, Long H, Pang Q, Liu H. P1.15-17 Risk Factors of Local Recurrence in EGFR-Mutant Stage III-pN2 Adenocarcinoma After Complete Resection: A Multi-Center Real-World Cohort Study. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Lee I, Won Y, Yun J, Lee J, Yun B, Cho S, Choi Y, Lee B, Seo S. Changes in expression of thioredoxin and thioredoxin binding protein-2 according to histone deacetylase inhibitor treatment in human endometrial cells from patients with endometriosis. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.1075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Won Y, Lee I, Yun J, Lee J, Seo S, Cho S, Choi Y, Lee B, Yun B. High mobility group box-1 increases cell proliferation, expression of adhesion molecules, and secretion of cytokines in human endometrial stromal cells in endometriosis. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.1071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Gade A, Yun J, Cantley L, Zippin J. 1234 Vitamin C as a potential treatment for melanoma. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Rose MA, Anderson J, Green SL, Yun J, Fernando SL. Morphine and pholcodine-specific IgE have limited utility in the diagnosis of anaphylaxis to benzylisoquinolines. Acta Anaesthesiol Scand 2018; 62:628-634. [PMID: 29368335 DOI: 10.1111/aas.13077] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 12/06/2017] [Accepted: 01/02/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND Investigation of immediate hypersensitivity reactions in the perioperative setting involves skin testing and measurement of specific IgE (sIgE) as standard practice. In the case of the neuromuscular blocking agents (NMBAs), the main allergenic epitopes have been shown to be substituted ammonium groups. Commercial assays are available for detection of sIgE to these epitopes using morphine and pholcodine substrates but questions have been raised about the effectiveness of these assays in the diagnosis of benzylisoquinoline anaphylaxis. This study was therefore undertaken to assess the effectiveness of these assays in the diagnosis of hypersensitivity reactions to this group of NMBAs. METHODS Analysis was carried out on all available results for patients assessed at the Royal North Shore Hospital Anaesthetic Allergy Clinic during the period June 2009 to June 2016. Standardised intradermal skin tests were performed with a panel of NMBAs. Measurement of sIgE to morphine and pholcodine was performed via the Phadia ImmunoCAP® system. RESULTS For all patients with positive skin test results to NMBAs which included a benzylisoquinoline NMBA (n = 24), 75% exhibited negative sIgE to both morphine and pholcodine. Where patients were reactive to benzylisoquinoline NMBAs alone (n = 12), 100% exhibited negative sIgE results, indicating 0% sensitivity of the assays relative to skin testing, in this subgroup. CONCLUSION Use of sIgE testing to morphine and pholcodine in the assessment of NMBA immediate hypersensitivity is a valuable tool particularly in the case of reactions to the aminosteroid NMBAs. However, these assays are unreliable in detecting sensitisation to benzylisoquinoline NMBAs.
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Yun J, Björkman S, Oliviero C, Soede N, Peltoniemi O. The effect of farrowing duration and parity on preovulatory follicular size and oxytocin release of sows at subsequent oestrus. Reprod Domest Anim 2018; 53:776-783. [PMID: 29604133 DOI: 10.1111/rda.13170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 01/26/2018] [Indexed: 11/30/2022]
Abstract
This study examined the extent to which prolonged farrowing and parity are associated with plasma oxytocin concentrations and follicular development of oestrous sows during subsequent insemination. A total of 30 sows were allocated to two groups based on farrowing duration: (i) SHORT (n = 14): 159 ± 29 min, (ii) LONG (n = 16): 533 ± 190 min. The sows were also divided into two parity classes: (i) YOUNG (n = 14): parity 2.5 ± 0.8, (ii) OLD (n = 16): parity 6.4 ± 2.3. After weaning, the ovaries were examined daily with transrectal ultrasound. On the second day of oestrus, blood samples were collected for oxytocin (OT) assay at -15, -10, -5, 0, +1, +2, +3, +4, +6, +8, +10, +15, +20, +25, +30, +40, +50 and +60 min with a boar contact between 0 and +10 min. Boar presence stimulated an increase in OT concentrations (p < .05). During boar presence, OT in the LONG group was higher than in the SHORT group (p < .01). The sows in the OLD group had a longer farrowing duration than in the YOUNG group (p < .05). OT levels and diameters of follicles were more relevant for parity than was the duration of farrowing. We therefore conclude that the OT levels and follicular development of oestrous sows are associated due to parity but difficult to be predicted from the duration of previous farrowing.
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Moon HG, Yun J, Hong BS, Lee E, Lee HB, Han W, Kim JI, Noh DY, Heo W, Hur S, Kang W, Lee C. Abstract P2-06-01: Molecular characterization of human malignant phyllodes tumors reveals potential targeted approaches. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p2-06-01] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Malignant phyllodes tumor (MPT) which belong to the fibroepithelial neoplasm spectrum is a rare type of breast malignancy, and currently there is no effective targeted approach available for MPT. In this study, we tried to identify key genomic alterations and biologic pathways in MPT by whole exome and RNA sequencing of nine MPT tissues. Whole exome sequencing revealed somatic alterations in EGFR, MED12, PIK3CA, PIK3R1, PDGFRA, PDGFRB, PTEN, and TP53. Transcriptome sequencing showed dysregulation of ECM-receptor interaction, focal adhesion, and PI3K-Akt signaling in MPTs when compared to normal breast or invasive breast cancer tissues. Based on the transcriptome profiles, the MPTs were classified into two subtypes; fibrous subtype with upregulation of stromal genes such as collagens and epithelial subtype with upregulation of E-cadherin and Claudins. The molecular classification of fibrous and epithelial subtypes was validated in 28 paraffin-embedded MPT tissues. The fibrous subtype showed higher mitotic index and increased risk for recurrence when compared to the epithelial subtype. We established a patient-derived xenograft model from one fibrous subtype MPT which harbored somatic mutation in PIK3R1 and PDGFRB. In that model, targeted treatment against PIK3CA/mTOR and PDGFR pathways effectively suppressed the tumor growth in vivo. Our data provide insights on the biologic understanding of MPT and suggest a clinically relevant molecular classification. Furthermore, we show that developing effective targeted approaches in MPT can be possible with genomic profiles and patient-derived xenograft models. The clinical efficacy of targeting PDGFR and PIK3CA/mTOR pathways in MPT should be tested in future clinical trials.
Citation Format: Moon H-G, Yun J, Hong BS, Lee E, Lee H-B, Han W, Kim J-I, Noh D-Y, Heo W, Hur S, Kang W, Lee C. Molecular characterization of human malignant phyllodes tumors reveals potential targeted approaches [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P2-06-01.
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Mori M, Ohashi T, Onizuka Y, Hiramatsu K, Hase M, Yun J, Ling Y, Torii S. Efficacy and safety of delayed-release dimethyl fumarate in treatment-naïve Japanese patients with relapsing-remitting multiple sclerosis: A post-hoc subgroup analysis of the apex study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kondo T, Kawachi I, Onizuka Y, Hiramatsu K, Hase M, Yun J, Ling Y, Torii S. Efficacy of delayed-release dimethyl fumarate in Japanese patients with relapsing multiple sclerosis in the placebo-controlled phase 3 apex study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yun J. A set of feasible and diverse model for estimating anti-dopaminergic neurodegeneration therapy in vivo. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ochi H, Niino M, Onizuka Y, Hiramatsu K, Hase M, Yun J, Ling Y, Torii S. Safety of delayed-release dimetyl fumarate in Japanese patients with relapsing multiple sclerosis: Subgroup analysis of the apex Part 1 study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ange N, LM M, Yun J, Chia KKM, Fernando SL. P93: ANTITHYMOCYTE GLOBULIN FOR THE TREATMENT OF CHECKPOINT INHIBITOR MEDIATED MYOCARDITIS. Intern Med J 2017. [DOI: 10.1111/imj.93_13578] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Li J, Fulton RB, Yun J, Fernando SL. P44: SPECIFIC IGE TO GALACTOSE-ALPHA-1,3-GALACTOSE (ALPHA-GAL) DOES NOT ADD TO THE DIAGNOSIS OF MAMMALIAN MEAT ALLERGY IN A TICK-ENDEMIC POPULATION. Intern Med J 2017. [DOI: 10.1111/imj.44_13578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yun J, Cho KS. Effects of organic loading rate on hydrogen and volatile fatty acid production and microbial community during acidogenic hydrogenesis in a continuous stirred tank reactor using molasses wastewater. J Appl Microbiol 2017; 121:1627-1636. [PMID: 27709740 DOI: 10.1111/jam.13316] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 04/15/2016] [Accepted: 04/22/2016] [Indexed: 11/29/2022]
Abstract
AIMS Microbial community associated with hydrogen production and volatile fatty acids (VFAs) accumulation was characterized in acidogenic hydrogenesis using molasses wastewater as a feedstock. METHODS AND RESULTS Hydrogen and VFAs production were measured under an organic loading rate (OLR) from 19 to 35 g-COD l-1 day-1 . The active microbial community was analysed using RNA-based massively parallel sequencing technique, and their correlation patterns were analysed using networking analysis. The continuous stirred tank reactor achieved stable hydrogen production at different OLR conditions, and the maximum hydrogen production rate (HPR) was 1·02 L-H2 l-1 day-1 at 31·0 g-COD l-1 day-1 . Butyrate (50%) and acetate (38%) positively increased with increase in OLR. Total VFA production stayed around 7135 mg l-1 during the operation period. Although Clostridiales and Lactobacillales were relatively abundant, the HPR was positively associated with Pseudomonadaceae and Micrococcineae. Total VFA and acetate, butyrate and propionate concentrations were positively correlated with lactic acid bacteria (LAB) such as Bacillales, Sporolactobacillus and Lactobacillus. CONCLUSIONS The close relationship between Pseudomonadaceae and Micrococcineae, and LAB play important roles for stable hydrogen and VFA production from molasses wastewater. SIGNIFICANCE AND IMPACT OF THE STUDY Microbial information on hydrogen and VFA production can be useful to design and operate for acidogenic hydrogenesis using high strength molasses wastewater.
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Geldenhuys WJ, Khayat MT, Yun J, Nayeem MA. Drug Delivery and Nanoformulations for the Cardiovascular System. RESEARCH & REVIEWS. DRUG DELIVERY 2017; 1:32-40. [PMID: 28713881 PMCID: PMC5507069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Therapeutic delivery to the cardiovascular system may play an important role in the successful treatment of a variety of disease state, including atherosclerosis, ischemic-reperfusion injury and other types of microvascular diseases including hypertension. In this review we evaluate the different options available for the development of suitable delivery systems that include the delivery of small organic compounds [adenosin A2A receptor agonist (CGS 21680), CYP-epoxygenases inhibitor (N-(methylsulfonyl)-2-(2-propynyloxy)-benzenehexanamide, trans-4-[4-(3-adamantan-1-ylureido)cyclohexyloxy] benzoic acid), soluble epoxide hydrolase inhibitor (N-methylsulfonyl-12,12-dibromododec-11-enamide), PPARγ agonist (rosiglitazone) and PPARγ antagonist (T0070907)], nanoparticles, peptides, and siRNA to the cardiovascular system. Effective formulations of nanoproducts have significant potential to overcome physiological barriers and improve therapeutic outcomes in patients. As per the literature covering targeted delivery to the cardiovascular system, we found that this area is still at infancy stage, as compare to the more mature fields of tumor cancer or brain delivery (e.g. blood-brain barrier permeability) with fewer publications focused on the targeted drug delivery technologies. Additionally, we show how pharmacology needs to be well understood when considering the cardiovascular system. Therefore, we discussed in this review various receptors agonists, antagonists, activators and inhibitors which will have effects on cardiovascular system.
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Chen-Sandoval J, Perry CC, Yun J, Chan PJ. HPV-associated cervical cancer cells targeted by triblock copolymer gold nanoparticle curcumin combination. EUR J GYNAECOL ONCOL 2017; 38:413-417. [PMID: 29693883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE Curcumin (diferuloylmethane) has promising anti-cervical cancer properties but requires a stabilizing complex such as the Pluronic triblock copolymer gold nanoparticle (GNP). The objectives were to study cytotoxicity of curcumnin and to determine the effect of copolymer GNPs curcumnin complex on cancer cell necrosis. MATERIALS AND METHODS The HeLa cells were maintained in Eagle Minimal Essential Medium, fetal bovine serum, and antibiotics, and passaged until 60% confluency was reached. The cells were exposed to either: (1) control medium, (2) 50 μM curcumin, (3) 100 μM curcumin, (4) 50 μM curcumnin with copolymer GNPs complex, or (5) 100 μM curcumnin with copolymer GNPs complex. The treated cells were incubated at 37°C with 5% CO(2) in air for 24 hours, and analyzed for viability, apoptosis or necrosis using the dual stains fluorescence procedure. RESULTS A dose-dependent increase in the HeLa necrosis was observed with increasing curcumnin concentrations. Cytotoxic effect was decreased by five- to ten-fold when the curcumin was complexed with copolymer GNPs. There were more apoptotic HeLa cells at the higher concentration of curcurnin but combination with copolymer GNPs resulted in decreased apoptosis. Cell viability was higher in curcumnin with copolymer GNPs (74.4 ± 4.8 versus 2.3 ± 2.2% live, mean ± SEM, with and without copolymer GNPs, respectively). CONCLUSION Curcumin increased HeLa cancer cell necrosis but its cytotoxicity was decreased by copolymer GNPs. The results suggested that this specific copolymer GNP did not enhance the curcumnin bioavailability in cultured cells possibly due to formation of copolymer GNP aggregates.
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Björkman S, Yun J, Niku M, Oliviero C, Soede NM, Peltoniemi OAT. Serial transvaginal ultrasound-guided biopsy of the porcine corpus luteum in vivo. Reprod Fertil Dev 2017; 29:931-939. [DOI: 10.1071/rd15435] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 01/08/2016] [Indexed: 11/23/2022] Open
Abstract
The aims of the present study was to develop and describe a transvaginal ultrasound-guided biopsy method for luteal tissue in the porcine and to evaluate the effects of the method on the reproductive tract, ovarian status and pregnancy status. Biopsies were performed in four multiparous sows on Days 9 and 15 of three consecutive oestrous cycles; the size and histological composition of the samples obtained were evaluated and the reproductive tract of the sows was monitored. Furthermore, biopsies were performed in 26 multiparous sows on Days 10 and 13 after insemination, and the pregnancy rate, gestation length and subsequent litter size were evaluated. RNA was extracted from the samples obtained and the quality and quantity were determined. Altogether, 76 biopsies were performed and 38 samples were obtained. Compared with sows from which no samples were obtained (n = 6), sows from which one or more samples were obtained (n = 24) were older (parity 5.0 ± 2.8 vs 2.2 ± 0.4, mean ± s.d.), heavier (290 ± 26 vs 244 ± 27 kg) and had higher back fat (11.4 ± 2.7 vs 6.4 ± 2.5 mm; P < 0.05 for all). No effect of the biopsies (P > 0.05) was observed on the cyclicity and reproductive organs of the sows, or on corpus luteum diameter on Day 13 (8.9 ± 1.0 vs 9.2 ± 1.1 mm), pregnancy rate (95% vs 96%), gestation length (115 ± 1 vs 115 ± 1 days) and subsequent litter size (12.7 ± 2.5 vs 13.3 ± 2.8) between sows from which samples were obtained and those from which no samples were obtained. The samples obtained had a diameter of 1 mm and contained heterogeneous tissue with various cell types. The RNA quantity was 520 ± 160 µg per sample and the RNA integrity number was 8.5 ± 1.0. In conclusion, an ultrasound-guided biopsy method for ovarian tissue, which can be used for gene expression studies, was established in the porcine. No effect on corpus luteum function was found.
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Tsukada S, Masuda H, Jung SY, Yun J, Kang S, Kim DY, Park JH, Ji ST, Kwon SM, Asahara T. Impaired development and dysfunction of endothelial progenitor cells in type 2 diabetic mice. DIABETES & METABOLISM 2016; 43:154-162. [PMID: 27638126 DOI: 10.1016/j.diabet.2016.07.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 07/02/2016] [Accepted: 07/23/2016] [Indexed: 12/16/2022]
Abstract
AIM Dysfunction of circulating endothelial progenitor cells (EPCs) has been shown to affect the development of microvascular diseases in diabetes patients. The aim of this study was to elucidate the development and mechanical dysfunction of EPCs in type 2 diabetes (T2D). METHODS The colony-forming capacity of EPCs and differentiation potential of bone marrow (BM) c-Kit(+)/Sca-I(+) lineage-negative mononuclear cells (KSL) were examined in T2D mice, db/db mice and KKAy mice, using EPC colony-forming assay (EPC-CFA). RESULTS T2D mice had fewer BM stem/progenitor cells, and proliferation of KSL was lowest in the BM of db/db mice. In T2D mice, the frequency of large colony-forming units (CFUs) derived from BM-KSL was highly reduced, indicating dysfunction of differentiation into mature EPCs. Only a small number of BM-derived progenitors [CD34(+) KSL cells], which contribute to the supply of EPCs for postnatal neovascularization, was also found. Furthermore, in terms of their plasticity to transdifferentiate into various cell types, BM-KSL exhibited a greater potential to differentiate into granulocyte macrophages (GMs) than into other cell types. CONCLUSION T2D affected EPC colony formation and differentiation of stem cells to mature EPCs or haematopoietic cells. These data suggest opposing regulatory mechanisms for differentiation into mature EPCs and GMs in T2D mice.
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Yip E, Yun J, Wachowicz K, Gabos Z, Rathee S, Fallone B. SU-G-JeP1-15: Sliding Window Prior Data Assisted Compressed Sensing for MRI Lung Tumor Tracking. Med Phys 2016. [DOI: 10.1118/1.4956990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Park M, Kim G, Jung H, Park S, Park S, Ji Y, Yun J. SU-F-T-159: Monte Carlo Simulation Studies of Three-Dimensional Dose Distribution for Polymer Gel Dosimeter and Radiochromic Gel Dosimeter in a Proton Beam. Med Phys 2016. [DOI: 10.1118/1.4956295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Baker S, Yip E, Yun J, Wachowicz K, Gabos Z, Fallone G. EP-1772: Comparison of dynamic 2D MRI with 4DCT lung tumor volumes for accurate real time imaging on linac-MR. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)33023-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kang JY, Song SH, Yun J, Jeon MS, Kim HP, Han SW, Kim TY. Disruption of CTCF/cohesin-mediated high-order chromatin structures by DNA methylation downregulates PTGS2 expression. Oncogene 2015; 34:5677-84. [PMID: 25703332 DOI: 10.1038/onc.2015.17] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 12/15/2014] [Accepted: 01/16/2015] [Indexed: 12/25/2022]
Abstract
The CCCTC-binding factor (CTCF)/cohesin complex regulates gene transcription via high-order chromatin organization of the genome. De novo methylation of CpG islands in the promoter region is an epigenetic hallmark of gene silencing in cancer. Although the CTCF/cohesin complex preferentially targets hypomethylated DNA, it remains unclear whether the CTCF/cohesin-mediated high-order chromatin structure is affected by DNA methylation during tumorigenesis. We found that DNA methylation downregulates the expression of prostaglandin-endoperoxide synthase 2 (PTGS2), which is an inducible, rate-limiting enzyme for prostaglandin synthesis, by disrupting CTCF/cohesin-mediated chromatin looping. We show that the CTCF/cohesin complex is enriched near a CpG island associated with PTGS2 and that the PTGS2 locus forms chromatin loops through methylation-sensitive binding of the CTCF/cohesin complex. DNA methylation abolishes the association of the CTCF/cohesin complex with the PTGS2 CpG island. Disruption of chromatin looping by DNA methylation abrogates the enrichment of transcriptional components, such as positive elongation factor b, at the transcriptional start site of the PTGS2 locus. These alterations result in the downregulation of PTGS2. Our results provide evidence that CTCF/cohesin-mediated chromatin looping of the PTGS2 locus is dynamically influenced by the DNA methylation status.
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