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Chung HW, Chang H, Hong D, Yun HJ, Chung HS. Optimal ropivacaine concentration for ultrasound-guided erector spinae plane block in patients who underwent video-assisted thoracoscopic lobectomy surgery. Niger J Clin Pract 2023; 26:1139-1146. [PMID: 37635608 DOI: 10.4103/njcp.njcp_63_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
Background An ultrasound-guided erector spinae plane block (ESPB) has emerged as an effective way to control postoperative pain and may be a good alternative way to an epidural block. However, relevant research on the appropriate concentration of local anesthetics for an ESPB remains scarce. Aims This study aimed to investigate the optimal concentration of ropivacaine for an ESPB in patients undergoing video-assisted thoracoscopic surgery (VATS). Methods A total of 68 patients who underwent a VATS lobectomy were enrolled. An ipsilateral ultrasound-guided ESPB was performed with three different ropivacaine concentrations as a local anesthetic: 0.189% (G1), 0.375% (G2), and 0.556% (G3). The total amount of perioperative remifentanil administered, patient-controlled analgesia (PCA) applied, and rescue drugs for postoperative analgesia during the 24 h after surgery were acquired, and numeric rating scale (NRS) scores were obtained. Results The total amount of intraoperative remifentanil administered was 7.20 ± 3.04 mcg/kg, 5.32 ± 2.70 mcg/kg, and 4.60 ± 1.75 in the G1, G2, and G3 groups, respectively. G2 and G3 had significantly lower amounts of remifentanil administered than the G1 group (P = 0.02 vs. G2; P = 0.003 vs. G3). The G3 group needed more inotropes than the G1 and G2 groups in the perioperative period (P = 0.045). The NRS scores, PCA, and rescue drug were not significantly different in the three groups. Conclusion The optimal concentration of ropivacaine recommended for an ESPB was 0.375%, which was effective in controlling pain and reducing the intraoperative opioid requirements with minimal adverse reactions such as hypotension.
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Affiliation(s)
- H W Chung
- Department of Anesthesiology and Pain Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - H Chang
- Department of Anesthesiology and Pain Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - D Hong
- Department of Anesthesiology and Pain Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - H J Yun
- Department of Anesthesiology and Pain Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - H S Chung
- Department of Anesthesiology and Pain Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Son J, Choi IH, Lim CG, Jang JH, Bang HB, Cha JW, Jeon EJ, Sohn MG, Yun HJ, Kim SC, Jeong KJ. Production of Cinnamaldehyde through Whole-Cell Bioconversion from trans-Cinnamic Acid Using Engineered Corynebacterium glutamicum. J Agric Food Chem 2022; 70:2656-2663. [PMID: 35102737 DOI: 10.1021/acs.jafc.1c07398] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Cinnamaldehyde (CAD) has various applications in foods and pharmaceuticals and has gained prominence as a potent nematicide in agricultural research owing to its nematicidal activity. However, conventional methods of CAD production, including extraction from plants or organic chemical synthesis, are environmentally hazardous and limit its utilization for downstream applications. Here, we engineered Corynebacterium glutamicum as a whole-cell biocatalyst for the efficient bioconversion of trans-cinnamic acid (t-CA) into CAD. An expression module of Mycobacterium phlei carboxylic acid reductase was constructed for the conversion of t-CA to CAD. Additionally, the putative dehydrogenase-related genes (dkgA, adhC, and cg1176) responsible for the conversion of CAD to cinnamyl alcohol were deleted from the engineered C. glutamicum strain to prevent the loss of CAD. Furthermore, as the conversion is NADPH-dependent, we investigated the conversion efficiency by exchanging the putative promoter region for the zwf gene, which encodes glucose-6-phosphate dehydrogenase, with a strong promoter to increase the NADPH pool. Finally, a bioconversion platform using C. glutamicum as a whole-cell biocatalyst was developed by deleting the vdh gene, which is involved in the reverse conversion of CAD to t-CA. Taken together, a 100% conversion yield of 1.1 g/L CAD from 1.2 g/L t-CA was obtained within 30 min.
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Affiliation(s)
- Jaewoo Son
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - In Hyeok Choi
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Chang Gyu Lim
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Jun Hong Jang
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hyun Bae Bang
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Ji Won Cha
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Eun Jung Jeon
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Min Gi Sohn
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hyo Jin Yun
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Sun Chang Kim
- Department of Biological Sciences, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
- Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Ki Jun Jeong
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
- Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Ryu AJ, Jeong BR, Kang NK, Jeon S, Sohn MG, Yun HJ, Lim JM, Jeong SW, Park YI, Jeong WJ, Park S, Chang YK, Jeong KJ. Safe-Harboring based novel genetic toolkit for Nannochloropsis salina CCMP1776: Efficient overexpression of transgene via CRISPR/Cas9-Mediated Knock-in at the transcriptional hotspot. Bioresour Technol 2021; 340:125676. [PMID: 34365302 DOI: 10.1016/j.biortech.2021.125676] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 07/23/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
Transgene expression in microalgae can be hampered by transgene silencing and unstable expression due to position effects. To overcome this, "safe harboring" transgene expression system was established for Nannochloropsis. Initially, transformants were obtained expressing a sfGFP reporter, followed by screening for high expression of sfGFP with fluorescence-activated cell sorter (FACS). 'T1' transcriptional hotspot was identified from a mutant showing best expression of sfGFP, but did not affect growth or lipid contents. By using a Cas9 editor strain, FAD12 gene, encoding Δ12-fatty acid desaturase (FAD12), was successfully knocked-in at the T1 locus, resulting in significantly higher expression of FAD12 than those of random integration. Importantly, the "safe harbored" FAD12 transformants showed four-fold higher production of linoleic acid (LA), the product of FAD12, leading to 1.5-fold increase in eicosapentaenoic acid (EPA). This safe harboring principle provide excellent proof of the concept for successful genetic/metabolic engineering of microalgae and other organisms.
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Affiliation(s)
- Ae Jin Ryu
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Advanced Biomass R&D Center (ABC), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Byeong-Ryool Jeong
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea; Single-Cell Center, Qingdao Institute of BioEnergy and Bioprocess Technology, Qingdao, Shandong 266101, China
| | - Nam Kyu Kang
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Advanced Biomass R&D Center (ABC), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Carl. R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Seungjib Jeon
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Advanced Biomass R&D Center (ABC), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Min Gi Sohn
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hyo Jin Yun
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Jong Min Lim
- Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Seok Won Jeong
- Department of Biological Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Youn-Il Park
- Department of Biological Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Won Joong Jeong
- Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Sunghoon Park
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yong Keun Chang
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Advanced Biomass R&D Center (ABC), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Ki Jun Jeong
- Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
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Chung SJ, Park YH, Yun HJ, Kwon H, Yoo HS, Sohn YH, Lee JM, Lee PH. Clinical relevance of amnestic versus non-amnestic mild cognitive impairment subtyping in Parkinson's disease. Eur J Neurol 2019; 26:766-773. [PMID: 30565368 DOI: 10.1111/ene.13886] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 12/06/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE To clarify whether subtyping of amnestic and non-amnestic mild cognitive impairment (MCI) is clinically relevant in Parkinson's disease (PD) by analyzing patterns of neuroimaging and longitudinal cognitive changes. METHODS We performed comparative analyses of cortical thickness, hippocampal volume, white matter integrity and resting-state functional connectivity between the patients with de-novo PD with amnestic MCI (PD-aMCI) (n = 50) and non-amnestic MCI (PD-naMCI) (n = 50) subtypes. Additionally, we assessed the longitudinal rate of cognitive decline in each cognitive domain over time and the rate of dementia conversion in patients with de-novo PD-aMCI (n = 125) and PD-naMCI (n = 61). RESULTS The demographic data showed that scores in memory domains were lower in the PD-aMCI group compared with the PD-naMCI group. There were no significant differences in cortical thickness, hippocampal volume and white matter integrity between the two groups, although the PD-aMCI group exhibited more cortical thinning and hippocampal atrophy relative to the control group. The PD-aMCI group exhibited increased functional connectivity in the left posterior parietal region with the salience network relative to the PD-naMCI group. The longitudinal cognitive assessment demonstrated that patients with PD-aMCI exhibited a more rapid cognitive decline in frontal/executive function than those with PD-naMCI (P = 0.022). In addition, the PD-aMCI group had a higher risk of dementia conversion than the PD-naMCI group. CONCLUSIONS This study suggests that the designation of PD-MCI subtypes based on memory function would highlight the heterogeneity of functional correlates as well as the longitudinal cognitive prognosis.
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Affiliation(s)
- S J Chung
- Department of Neurology, Yonsei University College of Medicine, Seoul
| | - Y-H Park
- Department of Biomedical Engineering, Hanyang University, Seoul, South Korea
| | - H J Yun
- Department of Biomedical Engineering, Hanyang University, Seoul, South Korea.,Fetal Neonatal Neuroimaging and Developmental Science Center, Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - H Kwon
- Department of Biomedical Engineering, Hanyang University, Seoul, South Korea.,Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
| | - H S Yoo
- Department of Neurology, Yonsei University College of Medicine, Seoul
| | - Y H Sohn
- Department of Neurology, Yonsei University College of Medicine, Seoul
| | - J-M Lee
- Department of Biomedical Engineering, Hanyang University, Seoul, South Korea
| | - P H Lee
- Department of Neurology, Yonsei University College of Medicine, Seoul.,Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea
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Kang SJ, Lee TH, Seok MG, Yun HJ, Jang YS, Byun JH. Biliary Cystadenoma Causing Esophageal Varices. KMJ 2016. [DOI: 10.7180/kmj.2016.31.2.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Biliary cystadenomas are benign but potentially malignant cystic neoplasm. The preferred treatment is radical resection because it is difficult to differentiate a benign from a malignant biliary cystadenoma. A 40 year-old woman presented with moderate abdominal discomfort. Esophageal varix was found up to mid-esophagus on endoscopy. She has no prior history of liver disease or chronic alcohol ingestion. About 15cm sized biliary cystadenoma was diagnosed by ultrasonography, computed tomography and magnetic resonance imaging. Serum level of bilirubin, alanine aminotransferase, alkaline phosphatase, gamma-glutamyl transpeptidase and tumor marker were elevated. The patient underwent US-guided aspiration. Tumor markers from the aspirated fluid are increased. Left hepatectomy was performed to completely remove the cyst. Histology of the resected specimen confirmed a biliary cystadenoma of the liver with ovary-like stroma. Without prior history of liver disease or chronic alcoholic ingestion, incidental finding of esophageal varix could show an important clue for diagnosis of biliary cystadenoma.
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Affiliation(s)
- H J Yun
- Department of Internal Medicine, Chungnam National University Hospital and Chungnam National Unversity School of Medicine, Daejeon, Korea
| | - H J Lee
- Department of Internal Medicine, Chungnam National University Hospital and Chungnam National Unversity School of Medicine, Daejeon, Korea
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Choi HJ, Kim JY, Lim SC, Kim G, Yun HJ, Choi HS. Dipeptidyl peptidase 4 promotes epithelial cell transformation and breast tumourigenesis via induction of PIN1 gene expression. Br J Pharmacol 2015; 172:5096-109. [PMID: 26267432 PMCID: PMC4687806 DOI: 10.1111/bph.13274] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 06/19/2015] [Accepted: 07/10/2015] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Dipeptidyl peptidase 4 (DPP4) is an aminopeptidase that is widely expressed in different cell types. Recent studies suggested that DPP4 plays an important role in tumour progression in several human malignancies. Here we have examined the mechanisms by which up-regulation of DPP4 expression causes epithelial transformation and mammary tumourigenesis. EXPERIMENTAL APPROACH Expression of DPP4 and the peptidylprolyl cis/trans isomerase, NIMA-interacting 1 (PIN1), and the cytotoxic effects of combined treatment with sitagliptin and juglone were investigated by immunohistochemistry, immunoblotting, real-time PCR, TUNEL and soft agar assays, using MCF7 cells. The effects of sitagliptin on tumour development in vivo were studied in the syngeneic 4T1 metastatic breast cancer model. KEY RESULTS Activity of the transcription factor E2F1 induced by EGF was enhanced by DPP4, thus increasing PIN1 expression. Furthermore, DPP4 enhanced MEK/ERK and JNK/c-Jun signalling induced by EGF, inducing AP-1 activity and epithelial cell transformation. In contrast, DPP4 silencing or DPP4 inhibition in MCF7 cells inhibited PIN1 expression via E2F1 activity induced by EGF, decreasing colony formation and inducing DNA fragmentation. In the syngeneic 4T1 metastatic breast cancer model, DPP4 overexpression increased tumour development, whereas treatment with sitagliptin and/or juglone suppressed it. Consistent with these observations, DPP4 levels were positively correlated with PIN1 expression in human breast cancer. CONCLUSIONS AND IMPLICATIONS DPP4 promoted EGF-induced epithelial cell transformation and mammary tumourigenesis via induction of PIN1 expression, suggesting that sitagliptin targeting of DPP4 could be a treatment strategy in patients with breast cancer.
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Affiliation(s)
- H J Choi
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - J Y Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - S-C Lim
- Department of Pathology, School of Medicine, Chosun University, Gwangju, South Korea
| | - G Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - H J Yun
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - H S Choi
- College of Pharmacy, Chosun University, Gwangju, South Korea
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Park S, Lee JM, Kim JW, Cho DY, Yun HJ, Han DH, Cheong JH, Kim BN. Associations between serotonin transporter gene (SLC6A4) methylation and clinical characteristics and cortical thickness in children with ADHD. Psychol Med 2015; 45:3009-3017. [PMID: 26017091 DOI: 10.1017/s003329171500094x] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Attention deficit hyperactivity disorder (ADHD) is a common, highly heritable psychiatric disorder. Additionally, environmental factors such as perinatal stress and early adversities contribute to the occurrence and severity of ADHD. Recently, DNA methylation has emerged as a mechanism that potentially mediates gene-environmental interaction effects in the aetiology and phenomenology of psychiatric disorders. Here, we investigated whether serotonin transporter gene (SLC6A4) methylation patterns were associated with clinical characteristics and regional cortical thickness in children with ADHD. METHOD In 102 children with ADHD (age 6-15 years), the methylation status of the SLC6A4 promoter was measured. Brain magnetic resonance imaging was obtained and ADHD symptoms were evaluated. RESULTS A higher methylation status of the SLC6A4 promoter was significantly associated with worse clinical presentations (more hyperactive-impulsive symptoms and more commission errors). Additionally, a negative correlation was observed between SLC6A4 methylation levels and cortical thickness values in the right occipito-temporal regions. CONCLUSIONS Our results suggest that the SLC6A4 methylation status may be associated with certain symptoms of ADHD, such as behavioural disinhibition, and related brain changes. Future studies that use a larger sample size and a control group are required to corroborate these results.
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Affiliation(s)
- S Park
- Department of Psychiatry,Seoul National Hospital,Seoul,Republic of Korea
| | - J-M Lee
- Department of Biomedical Engineering,Hanyang University,Seoul,Republic of Korea
| | - J-W Kim
- Division of Child and Adolescent Psychiatry,Department of Psychiatry,Seoul National University College of Medicine,Seoul,Republic of Korea
| | - D-Y Cho
- Lab Genomics Clinical Research Institute,Seoul,Republic of Korea
| | - H J Yun
- Department of Biomedical Engineering,Hanyang University,Seoul,Republic of Korea
| | - D H Han
- Department of Psychiatry,College of Medicine,Chung Ang University,Seoul,Republic of Korea
| | - J H Cheong
- Uimyung Research Institute for Neuroscience,Sahmyook University,Seoul,Republic of Korea
| | - B-N Kim
- Division of Child and Adolescent Psychiatry,Department of Psychiatry,Seoul National University College of Medicine,Seoul,Republic of Korea
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Kim JY, Lim SC, Kim G, Yun HJ, Ahn SG, Choi HS. Interleukin-33/ST2 axis promotes epithelial cell transformation and breast tumorigenesis via upregulation of COT activity. Oncogene 2015. [PMID: 25531326 DOI: 10.1038/onc.2014.418.] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Cytokines of the interleukin-1 (IL-1) family, such as IL-1α/β and IL-18, have pleiotropic activities in innate and adaptive immune responses in host defense and diseases. Insight into their biological functions helped develop novel therapeutic approaches to treat human inflammatory diseases. IL-33 is an important member of the IL-1 family of cytokines and is a ligand of the ST2 receptor, a member of the IL-1 receptor family. However, the role of the IL-33/ST2 axis in tumor growth and metastasis of breast cancer remains unclear. Here, we demonstrate that IL-33 is a critical tumor promoter during epithelial cell proliferation and tumorigenesis in the breast. IL-33 dose- and time-dependently increased Cancer Osaka Thyroid (COT) phosphorylation via ST2-COT interaction in normal epithelial and breast cancer cells. The IL-33/ST2/COT cascade induced the activation of the MEK-ERK (MEK-extracellular signal-regulated kinase), JNK-cJun (cJun N-terminal kinase-cJun) and STAT3 (signal transducer and activator of transcription 3) signaling pathways, followed by increased AP-1 and stat3 transcriptional activity. When small interfering RNAs of ST2 and COT were introduced into cells, IL-33-induced AP-1 and stat3 activity were significantly decreased, unlike that in the control cells. The inhibition of COT activity resulted in decreased IL-33-induced epithelial cell transformation, and knockdown of IL-33, ST2 and COT in breast cancer cells attenuated tumorigenicity of breast cancer cells. Consistent with these observations, ST2 levels were positively correlated with COT expression in human breast cancer. These findings provide a novel perspective on the role of the IL-33/ST2/COT signaling pathway in supporting cancer-associated inflammation in the tumor microenvironment. Therapeutic approaches that target this pathway may, therefore, effectively inhibit carcinogenesis in the breast.
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Affiliation(s)
- J Y Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - S-C Lim
- Department of Pathology, School of Medicine, Chosun University, Gwangju, South Korea
| | - G Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - H J Yun
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - S-G Ahn
- Department of Pathology, School of Dentistry, Chosun University, Gwangju, South Korea
| | - H S Choi
- College of Pharmacy, Chosun University, Gwangju, South Korea
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10
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Kim JY, Lim SC, Kim G, Yun HJ, Ahn SG, Choi HS. Interleukin-33/ST2 axis promotes epithelial cell transformation and breast tumorigenesis via upregulation of COT activity. Oncogene 2015; 34:4928-38. [PMID: 25531326 DOI: 10.1038/onc.2014.418] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 10/08/2014] [Accepted: 10/31/2014] [Indexed: 02/07/2023]
Abstract
Cytokines of the interleukin-1 (IL-1) family, such as IL-1α/β and IL-18, have pleiotropic activities in innate and adaptive immune responses in host defense and diseases. Insight into their biological functions helped develop novel therapeutic approaches to treat human inflammatory diseases. IL-33 is an important member of the IL-1 family of cytokines and is a ligand of the ST2 receptor, a member of the IL-1 receptor family. However, the role of the IL-33/ST2 axis in tumor growth and metastasis of breast cancer remains unclear. Here, we demonstrate that IL-33 is a critical tumor promoter during epithelial cell proliferation and tumorigenesis in the breast. IL-33 dose- and time-dependently increased Cancer Osaka Thyroid (COT) phosphorylation via ST2-COT interaction in normal epithelial and breast cancer cells. The IL-33/ST2/COT cascade induced the activation of the MEK-ERK (MEK-extracellular signal-regulated kinase), JNK-cJun (cJun N-terminal kinase-cJun) and STAT3 (signal transducer and activator of transcription 3) signaling pathways, followed by increased AP-1 and stat3 transcriptional activity. When small interfering RNAs of ST2 and COT were introduced into cells, IL-33-induced AP-1 and stat3 activity were significantly decreased, unlike that in the control cells. The inhibition of COT activity resulted in decreased IL-33-induced epithelial cell transformation, and knockdown of IL-33, ST2 and COT in breast cancer cells attenuated tumorigenicity of breast cancer cells. Consistent with these observations, ST2 levels were positively correlated with COT expression in human breast cancer. These findings provide a novel perspective on the role of the IL-33/ST2/COT signaling pathway in supporting cancer-associated inflammation in the tumor microenvironment. Therapeutic approaches that target this pathway may, therefore, effectively inhibit carcinogenesis in the breast.
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Affiliation(s)
- J Y Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - S-C Lim
- Department of Pathology, School of Medicine, Chosun University, Gwangju, South Korea
| | - G Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - H J Yun
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - S-G Ahn
- Department of Pathology, School of Dentistry, Chosun University, Gwangju, South Korea
| | - H S Choi
- College of Pharmacy, Chosun University, Gwangju, South Korea
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Choi HJ, Kim JY, Lim SC, Kim G, Yun HJ, Choi HS. Dipeptidyl peptidase 4 promotes epithelial cell transformation and breast tumourigenesis via induction of PIN1 gene expression. Br J Pharmacol 2015. [PMID: 26267432 DOI: 10.1111/bph.13274.] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Dipeptidyl peptidase 4 (DPP4) is an aminopeptidase that is widely expressed in different cell types. Recent studies suggested that DPP4 plays an important role in tumour progression in several human malignancies. Here we have examined the mechanisms by which up-regulation of DPP4 expression causes epithelial transformation and mammary tumourigenesis. EXPERIMENTAL APPROACH Expression of DPP4 and the peptidylprolyl cis/trans isomerase, NIMA-interacting 1 (PIN1), and the cytotoxic effects of combined treatment with sitagliptin and juglone were investigated by immunohistochemistry, immunoblotting, real-time PCR, TUNEL and soft agar assays, using MCF7 cells. The effects of sitagliptin on tumour development in vivo were studied in the syngeneic 4T1 metastatic breast cancer model. KEY RESULTS Activity of the transcription factor E2F1 induced by EGF was enhanced by DPP4, thus increasing PIN1 expression. Furthermore, DPP4 enhanced MEK/ERK and JNK/c-Jun signalling induced by EGF, inducing AP-1 activity and epithelial cell transformation. In contrast, DPP4 silencing or DPP4 inhibition in MCF7 cells inhibited PIN1 expression via E2F1 activity induced by EGF, decreasing colony formation and inducing DNA fragmentation. In the syngeneic 4T1 metastatic breast cancer model, DPP4 overexpression increased tumour development, whereas treatment with sitagliptin and/or juglone suppressed it. Consistent with these observations, DPP4 levels were positively correlated with PIN1 expression in human breast cancer. CONCLUSIONS AND IMPLICATIONS DPP4 promoted EGF-induced epithelial cell transformation and mammary tumourigenesis via induction of PIN1 expression, suggesting that sitagliptin targeting of DPP4 could be a treatment strategy in patients with breast cancer.
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Affiliation(s)
- H J Choi
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - J Y Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - S-C Lim
- Department of Pathology, School of Medicine, Chosun University, Gwangju, South Korea
| | - G Kim
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - H J Yun
- College of Pharmacy, Chosun University, Gwangju, South Korea
| | - H S Choi
- College of Pharmacy, Chosun University, Gwangju, South Korea
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12
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Park S, Lee JM, Kim JW, Cheong JH, Yun HJ, Hong YC, Kim Y, Han DH, Yoo HJ, Shin MS, Cho SC, Kim BN. Association between phthalates and externalizing behaviors and cortical thickness in children with attention deficit hyperactivity disorder. Psychol Med 2015; 45:1601-1612. [PMID: 25388623 DOI: 10.1017/s0033291714002694] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND Previous studies have implicated the relationship between environmental phthalate exposure and attention deficit hyperactivity disorder (ADHD) symptoms of childhood, but no studies have been conducted in children who have a confirmed diagnosis of ADHD obtained through meticulous diagnostic testing. We aimed to determine whether phthalate metabolites in urine would be higher in children with ADHD than in those without ADHD and would correlate with symptom severity and cortical thickness in ADHD children. METHOD A cross-sectional examination of urine phthalate metabolite concentrations was performed; scores for ADHD symptoms, externalizing problems, and continuous performance tests were obtained from 180 children with ADHD, and brain-imaging data were obtained from 115 participants. For the control group, children without ADHD (N = 438) were recruited. Correlations between phthalate metabolite concentrations and clinical measures and brain cortical thickness were investigated. RESULTS Concentrations of phthalate metabolites, particularly the di(2-ethylhexyl) phthalate (DEHP) metabolite, were significantly higher in boys with ADHD than in boys without ADHD. Concentrations of the di-n-butyl phthalate (DBP) metabolite were significantly higher in the combined or hyperactive-impulsive subtypes compared to the inattentive subtype, and the metabolite was positively correlated with the severity of externalizing symptoms. Concentrations of the DEHP metabolite were negatively correlated with cortical thickness in the right middle and superior temporal gyri. CONCLUSIONS The results of this study suggest an association between phthalate concentrations and both the diagnosis and symptom severity of ADHD. Imaging findings suggest a negative impact of phthalates on regional cortical maturation in children with ADHD.
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Affiliation(s)
- S Park
- Department of Child and Adolescent Psychiatry,Seoul National Hospital,Seoul,Republic of Korea
| | - J-M Lee
- Department of Biomedical Engineering,Hanyang University,Seoul,Republic of Korea
| | - J-W Kim
- Division of Child and Adolescent Psychiatry,Department of Psychiatry,Seoul National University Hospital,Seoul,Republic of Korea
| | - J H Cheong
- Uimyung Research Institute for Neuroscience,Sahmyook University,Seoul,Republic of Korea
| | - H J Yun
- Department of Biomedical Engineering,Hanyang University,Seoul,Republic of Korea
| | - Y-C Hong
- Department of Preventive Medicine,Seoul National University College of MedicineandInstitute of Environmental Medicine,Seoul,Republic of Korea
| | - Y Kim
- Department of Child and Adolescent Psychiatry,Seoul National Hospital,Seoul,Republic of Korea
| | - D H Han
- Department of Psychiatry,Chung Ang University,College of Medicine,Seoul,Republic of Korea
| | - H J Yoo
- College of Medicine and Behavioral Medicine Institute,Seoul National University,Seoul,Republic of Korea
| | - M-S Shin
- Division of Child and Adolescent Psychiatry,Department of Psychiatry,Seoul National University Hospital,Seoul,Republic of Korea
| | - S-C Cho
- Division of Child and Adolescent Psychiatry,Department of Psychiatry,Seoul National University Hospital,Seoul,Republic of Korea
| | - B-N Kim
- Division of Child and Adolescent Psychiatry,Department of Psychiatry,Seoul National University Hospital,Seoul,Republic of Korea
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13
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Park MJ, Yun HJ, Lee KH, Cho AR, Choi IS, Moon JI, Yoon SH, Hwang WM, Yun SR. Improvement of Hypoxemia by Inhaled Nitric Oxide Gas Therapy in Potential Deceased Donor. Korean J Transplant 2014. [DOI: 10.4285/jkstn.2014.28.4.250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Min Ji Park
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - Hyo Jin Yun
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - Kyung Ho Lee
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - A Reum Cho
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - In Seok Choi
- Department of Surgery, College of Medicine, Konyang University, Daejeon, Korea
| | - Ju Ik Moon
- Department of Surgery, College of Medicine, Konyang University, Daejeon, Korea
| | - Se Hee Yoon
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - Won Min Hwang
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - Sung Ro Yun
- Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
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14
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Lim SM, Chang H, Yoon MJ, Hong YK, Kim H, Chung WY, Park CS, Nam KH, Kang SW, Kim MK, Kim SB, Lee SH, Kim HG, Na II, Kim YS, Choi MY, Kim JG, Park KU, Yun HJ, Kim JH, Cho BC. A multicenter, phase II trial of everolimus in locally advanced or metastatic thyroid cancer of all histologic subtypes. Ann Oncol 2013; 24:3089-94. [PMID: 24050953 DOI: 10.1093/annonc/mdt379] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- S M Lim
- Department of Internal Medicine, Division of Medical Oncology, Yonsei University College of Medicine, Seoul
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15
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Yang SD, Jeong KS, Yun HJ, Kim YM, Lee SY, Oh JS, Lee HD, Lee GW. Analysis of flicker noise for improved data retention characteristics in silicon-oxide-high-k-oxide-silicon flash memory using N2 implantation. J Nanosci Nanotechnol 2013; 13:3331-3334. [PMID: 23858853 DOI: 10.1166/jnn.2013.7294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this paper, we fabricate planar-type Silicon-Oxide-High-k-Oxide-Silicon (SOHOS) and the planar-type SOHOS devices with N2 implantation of 3 x 10(15) dose in a tunneling oxide to determine the impact of N2 implantation in the tunneling oxide of a memory device. The N2 implantation device has better retention characteristics than the device with no implantation. In order establish the correlation between N2 implantation and retention characteristic improvement, the low frequency noise (1/f noise) characteristic is investigated. The normalized drain current noise (S(ID)/I(D)2) level of the N2 implantation device is higher than that of the device with no implantation, which means that N2 implantation causes more trap formation near the interface. Considering that N2 implantation does not affect the DC transfer characteristics, such as mobility and sub-threshold slope, this finding indicates that the increase in the 1/f noise level is due to oxide traps rather than to interface traps. Therefore, the retention characteristic improvement in the N2 implantation device can be explained by the generation of higher number of oxide traps and an increase in the potential barrier blocking the leakage path in the tunneling oxide.
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Affiliation(s)
- S D Yang
- Department of Electronics Engineering, Chungnam National University, Daejeon 305-764, Korea
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16
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Yang JJ, Yoon U, Yun HJ, Im K, Choi YY, Lee KH, Park H, Hough MG, Lee JM. Prediction for human intelligence using morphometric characteristics of cortical surface: partial least square analysis. Neuroscience 2013; 246:351-61. [PMID: 23643979 DOI: 10.1016/j.neuroscience.2013.04.051] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 04/18/2013] [Accepted: 04/22/2013] [Indexed: 11/17/2022]
Abstract
A number of imaging studies have reported neuroanatomical correlates of human intelligence with various morphological characteristics of the cerebral cortex. However, it is not yet clear whether these morphological properties of the cerebral cortex account for human intelligence. We assumed that the complex structure of the cerebral cortex could be explained effectively considering cortical thickness, surface area, sulcal depth and absolute mean curvature together. In 78 young healthy adults (age range: 17-27, male/female: 39/39), we used the full-scale intelligence quotient (FSIQ) and the cortical measurements calculated in native space from each subject to determine how much combining various cortical measures explained human intelligence. Since each cortical measure is thought to be not independent but highly inter-related, we applied partial least square (PLS) regression, which is one of the most promising multivariate analysis approaches, to overcome multicollinearity among cortical measures. Our results showed that 30% of FSIQ was explained by the first latent variable extracted from PLS regression analysis. Although it is difficult to relate the first derived latent variable with specific anatomy, we found that cortical thickness measures had a substantial impact on the PLS model supporting the most significant factor accounting for FSIQ. Our results presented here strongly suggest that the new predictor combining different morphometric properties of complex cortical structure is well suited for predicting human intelligence.
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Affiliation(s)
- J-J Yang
- Department of Biomedical Engineering, Hanyang University, Seoul, South Korea
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17
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Khanal P, Yun HJ, Lim SC, Ahn SG, Yoon HE, Kang KW, Hong R, Choi HS. Proyl isomerase Pin1 facilitates ubiquitin-mediated degradation of cyclin-dependent kinase 10 to induce tamoxifen resistance in breast cancer cells. Oncogene 2012; 31:3845-56. [PMID: 22158035 DOI: 10.1038/onc.2011.548] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Endocrine therapies that inhibit estrogen receptor (ER)-α signaling are the most common and effective treatment for ER-α-positive breast cancer. However, the use of these agents is limited by the frequent development of resistance. The aim of this study was to elucidate the mechanisms by which downregulation of CDK10 expression confers resistance to tamoxifen in breast cancer. Here, we show that peptidyl-prolyl isomerase Pin1 downregulates CDK10 protein as a result of its interaction with and ubiquitination of CDK10, thereby affecting CDK10-dependent Raf-1 phosphorylation (S338). Pin1(-/-) mouse embryonic fibroblasts (MEFs) show higher CDK10 expression than Pin1(+/+) MEFs, whereas CDK10 protein was downregulated in the rescued Pin1(-/-) MEFs after reexpression of Pin1. Pin1 silencing in SKBR-3 and MCF7 cells increased the CDK10 expression. In human tamoxifen-resistant breast cancer and tamoxifen-resistant MCF7 cells, immunohistochemical staining and immunoblotting analysis shows an inverse correlation between the expression of CDK10 and the degree of tamoxifen resistance. There was also a positive correlation between the high level of P-Raf-1 (Ser338) and Pin1 in human tamoxifen-resistant breast cancer and tamoxifen-resistant MCF7 (TAMR-MCF7) cells. Importantly, 4-OH tamoxifen (4-OHT), when used in combination with overexpressed CDK10 or Raf-1 inhibitor, increased cleaved PARP and DNA fragmentation to inhibit cologenic growth of MCF7 cells and Tamoxifen-resistant MCF7 cells, respectively. On the basis of these findings, we suggest that the Pin1-mediated CDK10 ubiquitination is a major regulator of tamoxifen-resistant breast cancer cell growth and survival.
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Affiliation(s)
- P Khanal
- BK21 Project Team, College of Pharmacy, Chosun University, Gwangju, Republic of Korea
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18
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Kim YM, Jeong KS, Yun HJ, Yang SD, Lee SY, Kim MJ, Kwon OS, Jeong CW, Kim JY, Kim SC, Lee GW. Electrical characteristic analysis using low-frequency noise in low-temperature polysilicon thin film transistors. J Nanosci Nanotechnol 2012; 12:5532-5536. [PMID: 22966605 DOI: 10.1166/jnn.2012.6336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study carried out an electrical characteristic analysis using low-frequency noise (LFN) in top gate p-type low-temperature polysilicon thin film transistors (LTPS TFTs) with different active layer thicknesses between 40 nm and 80 nm. The transfer characteristic curves show that the 40-nm device has better electrical characteristics compared with the 80-nm device. The carrier number fluctuation, with and without correlated mobility fluctuation model in both devices, has modeled well the measured noise. On the other hand, the trap density and coulomb scattering in the 40-nm device are smaller compared with the 80-nm device. To confirm the effectiveness of the LFN noise analysis, the trap densities at a grain boundary are extracted using in both devices the similar methods of Proano et al. and Levinson et al. That is, coulomb scattering, caused by the trapped charges at or near the interface, has a greater effect on the device with inferior electrical properties. Based on the LFN and the quantitative analysis of the trap density at a grain boundary, the interface traps between the active layer and the gate insulator can explain the devices' electrical degradation.
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Affiliation(s)
- Y M Kim
- Department of Electronics Engineering, Chungnam National University, Daejeon, 305-764, Korea
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19
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Stupp R, Tosoni A, Bromberg JEC, Hau P, Campone M, Gijtenbeek J, Frenay M, Breimer L, Wiesinger H, Allgeier A, van den Bent MJ, Bogdahn U, van der Graaf W, Yun HJ, Gorlia T, Lacombe D, Brandes AA. Sagopilone (ZK-EPO, ZK 219477) for recurrent glioblastoma. A phase II multicenter trial by the European Organisation for Research and Treatment of Cancer (EORTC) Brain Tumor Group. Ann Oncol 2011; 22:2144-2149. [PMID: 21321091 PMCID: PMC3164435 DOI: 10.1093/annonc/mdq729] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Background: Sagopilone (ZK 219477), a lipophylic and synthetic analog of epothilone B, that crosses the blood–brain barrier has demonstrated preclinical activity in glioma models. Patients and methods: Patients with first recurrence/progression of glioblastoma were eligible for this early phase II and pharmacokinetic study exploring single-agent sagopilone (16 mg/m2 over 3 h every 21 days). Primary end point was a composite of either tumor response or being alive and progression free at 6 months. Overall survival, toxicity and safety and pharmacokinetics were secondary end points. Results: Thirty-eight (evaluable 37) patients were included. Treatment was well tolerated, and neuropathy occurred in 46% patients [mild (grade 1) : 32%]. No objective responses were seen. The progression-free survival (PFS) rate at 6 months was 6.7% [95% confidence interval (CI) 1.3–18.7], the median PFS was just over 6 weeks, and the median overall survival was 7.6 months (95% CI 5.3–12.3), with a 1-year survival rate of 31.6% (95% CI 17.7–46.4). Maximum plasma concentrations were reached at the end of the 3-h infusion, with rapid declines within 30 min after termination. Conclusions: No evidence of relevant clinical antitumor activity against recurrent glioblastoma could be detected. Sagopilone was well tolerated, and moderate-to-severe peripheral neuropathy was observed in despite prolonged administration.
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Affiliation(s)
- R Stupp
- Department of Neurosurgery, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland.
| | - A Tosoni
- Department of Medical Oncology, Bellaria Maggiore Hospital, Bologna, Italy
| | - J E C Bromberg
- Department of Neuro-Oncology, Daniel den Hoed Cancer Center/Erasmus University Hospital, Rotterdam, The Netherlands
| | - P Hau
- Department of Neurology, University of Regensburg Medical School, Regensburg, Germany
| | - M Campone
- Department of Medical Oncology, Institut Régional du Cancer Nantes Atlantique, CLCC René Gauducheau, Centre de Recherche en Cancérologie, St Herblain, France
| | - J Gijtenbeek
- Department of Neurology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - M Frenay
- Department of Medical Oncology, Centre Antoine Lacassagne, Nice Cedex, France
| | | | | | | | - M J van den Bent
- Department of Neuro-Oncology, Daniel den Hoed Cancer Center/Erasmus University Hospital, Rotterdam, The Netherlands
| | - U Bogdahn
- Department of Neurology, University of Regensburg Medical School, Regensburg, Germany
| | - W van der Graaf
- Department of Neurology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - H J Yun
- EORTC Headquarters, Brussels, Belgium
| | - T Gorlia
- EORTC Headquarters, Brussels, Belgium
| | - D Lacombe
- EORTC Headquarters, Brussels, Belgium
| | - A A Brandes
- Department of Medical Oncology, Bellaria Maggiore Hospital, Bologna, Italy
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20
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Kim Y, Yun HJ, Lee JA, Park HM, Kim SY, Cho Y. Royal jelly enhances migration of human dermal fibroblasts with decreased levels of triglycerides and cholesterol in in vitro wound healing model. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.922.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Youngae Kim
- Graduate School of East‐West Medical ScienceKyung Hee UniversityGyeonggi‐doRepublic of Korea
| | - HJ Yun
- Graduate School of East‐West Medical ScienceKyung Hee UniversityGyeonggi‐doRepublic of Korea
| | - JA Lee
- Graduate School of East‐West Medical ScienceKyung Hee UniversityGyeonggi‐doRepublic of Korea
| | - HM Park
- Graduate School of East‐West Medical ScienceKyung Hee UniversityGyeonggi‐doRepublic of Korea
| | - SY Kim
- Graduate School of East‐West Medical ScienceKyung Hee UniversityGyeonggi‐doRepublic of Korea
| | - Y Cho
- Graduate School of East‐West Medical ScienceKyung Hee UniversityGyeonggi‐doRepublic of Korea
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Abstract
To investigate whether the arylsulfate sulfotransferase (ASST) is suitable as a reporter system for monitoring gene expression, a reporter vector carrying the fragments of the astA coding region without the promoter region was constructed and designated as pSY815. As a test of the ASST reporter system's suitability, the regulatory regions of ermC and lacZ were inserted upstream of the coding region of the reporter gene to generate pSY815-EC and pSY815-LZ, respectively. In the absence of the inserted regulatory regions, the plasmids displayed very low background activities in Bacillus subtilis and Escherichia coli. The ASST activity under the control of the ermC regulatory region was increased 4.4-fold in B. subtilis when induced by 0.1 microgml(-1) of erythromycin. These results were consistent with a lacZ reporter gene assay of the ermC regulatory region. Furthermore, we confirmed that the lacZ promoter in E. coli was strongly induced to a 17.9-fold increase by 0.05 mM of isopropyl-beta-D-thiogalactopyranoside (IPTG) in this reporter system. These results indicate that the ASST is a suitable reporter system. The lack of endogenous activity, the simple detection of enzyme activity in the living cell, the commercially available non-toxic substrates, and the high sensitivity make ASST a useful genetic reporter system for monitoring gene expression and understanding gene regulation.
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Affiliation(s)
- H J Yun
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Korea
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22
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Kulikowski CA, Muchnik I, Yun HJ, Dayanik AA, Zhang D, Song Y, Montelione GT. Protein structural domain parsing by consensus reasoning over multiple knowledge sources and methods. Stud Health Technol Inform 2002; 84:965-9. [PMID: 11604875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Domain parsing, or the detection of signals of protein structural domains from sequence data, is a complex and difficult problem. If carried out reliably it would be a powerful interpretive and predictive tool for genomic and proteomic studies. We report on a novel approach to domain parsing using consensus techniques based on Hidden Markov Models (HMMs) and BLAST searches built from a training set of 1471 continuous structural domains from the Dali Domain Dictionary (DDD). Validation on an independent test sample of family-matched structural domain sequences from the Scop database yields a consensus prediction performance rate of 75.5%, well above the 58% obtained by simple agreement of methods.
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Affiliation(s)
- C A Kulikowski
- Computer Science Department, Rutgers University, Piscataway, NJ 08903, USA.
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23
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Kang JW, Jeong YJ, Kwon AR, Yun HJ, Kim DH, Choi EC. Cloning, sequence analysis, and characterization of the astA gene encoding an arylsulfate sulfotransferase from Citrobacter freundii. Arch Pharm Res 2001; 24:316-22. [PMID: 11534764 DOI: 10.1007/bf02975099] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Arylsulfate sulfotransferase (ASST) transfers a sulfate group from a phenolic sulfate ester to a phenolic acceptor substrate. In the present study, the gene encoding ASST was cloned from a genomic library copy of Citrobacter freundii, subcloned into the vector pGEM3Zf(-) and sequenced. Sequencing revealed two contiguous open reading frames (ORF1 and ORF2) on the same strand and based on amino acid sequence homology, they were designated as astA and dsbA, respectively. The amino acid sequence of astA deduced from C. freundii was highly similar to that of the Salmonella typhimurium, Enterobacter amnigenus, Klebsiella, Pseudomonas putida, and Campylobacter jejuni, encoded by the astA genes. However, the ASST activity assay revealed different acceptor specificities. Using p-nitrophenyl sulfate (PNS) as a donor substrate, alpha-naphthol was found to be the best acceptor substrate, followed by phenol, resorcinol, p-acetaminophen, tyramine and tyrosine.
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Affiliation(s)
- J W Kang
- College of Pharmacy, Seoul National University, Korea
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Kwon AR, Yun HJ, Choi EC. Kinetic mechanism and identification of the active site tyrosine residue in Enterobacter amnigenus arylsulfate sulfotransferase. Biochem Biophys Res Commun 2001; 285:526-9. [PMID: 11444874 DOI: 10.1006/bbrc.2001.5185] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bacterial arylsulfate sulfotransferase (ASST) catalyzes the transfer of a sulfate group from a phenyl sulfate ester to a phenolic acceptor. The kinetic mechanism of Enterobacter amnigenus ASST was determined. Plots of 1/v versus 1/[substrate (A)] at different fixed substrate (B) concentrations gave a series of parallel lines. One of the reaction products, p-nitrophenol, inhibited the enzyme noncompetitively with respect to p-nitrophenyl sulfate, but competitively to alpha-naphthol. These results correspond to a ping pong bi bi mechanism. By site-directed mutagenesis, we substituted each conserved tyrosine residue with phenylalanine. Among the mutants, Y123F showed severely reduced catalytic activity. We conclude that Tyr 123 is an essential active site residue. A mechanistic hypothesis is presented to account for these observations.
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Affiliation(s)
- A R Kwon
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-742, Korea
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Ha HK, Jee KR, Yu E, Yu CS, Rha SE, Lee IJ, Yun HJ, Kim JC, Park KC, Auh YH. CT features of metastatic linitis plastica to the rectum in patients with peritoneal carcinomatosis. AJR Am J Roentgenol 2000; 174:463-6. [PMID: 10658725 DOI: 10.2214/ajr.174.2.1740463] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE We examined the CT features of 22 patients with metastatic linitis plastica to the rectum. CONCLUSION Metastatic linitis plastica to the rectum should be considered when CT shows a long segment of circumferential rectal wall thickening, especially in patients with peritoneal carcinomatosis from gastric cancer. In such patients, CT helps avoid unnecessary extensive surgery.
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Affiliation(s)
- H K Ha
- Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Lee CH, Yun HJ, Kang HS, Kim HD. ERK/MAPK pathway is required for changes of cyclin D1 and B1 during phorbol 12-myristate 13-acetate-induced differentiation of K562 cells. IUBMB Life 1999; 48:585-91. [PMID: 10683762 DOI: 10.1080/713803574] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Phorbol 12-myristate 13-acetate (PMA)-induced differentiation of human erythroleukemic K562 cells is characterized by growth arrest, morphological change, and expression of megakaryocyte-specific proteins. We examined the possible involvement of cell cycle regulators with PMA-induced growth arrest and megakaryocytic differentiation of K562 cells. The concentrations of cyclin D1 and p21Waf1/Cip1 were dramatically increased, whereas those of cyclin B1 and cdc2 were decreased, by PMA treatment. The concentrations of most cyclin-dependent kinases (Cdk2, Cdk4, and Cdk6), however, were unchanged by PMA treatment. PD98059, a specific inhibitor of MEK1, partially prevented the increase in cyclin D1 caused by PMA and fully reversed the down-regulation of cyclin B1 protein seen in response to PMA treatment. Thus, it is demonstrated here that the PMA-mediated changes of cyclin D1 and B1 are the result of a persistent increase in extracellular signal-regulated kinase/mitogen-activated protein kinase (ERK/MAPK) activity.
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Affiliation(s)
- C H Lee
- Department of Molecular Biology, College of Natural Sciences, Pusan National University, Korea
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Mohan DS, Samuels MA, Selim MA, Shalodi AD, Ellis RJ, Samuels JR, Yun HJ. Long-term outcomes of therapeutic pelvic lymphadenectomy for stage I endometrial adenocarcinoma. Gynecol Oncol 1998; 70:165-71. [PMID: 9740684 DOI: 10.1006/gyno.1998.5098] [Citation(s) in RCA: 146] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The treatment of patients with stage I endometrial adenocarcinoma is often shorter and less expensive if total abdominal hysterectomy (TAH), bilateral salpingo-oophorectomy (BSO), and therapeutic lymphadenectomy are used rather than TAH, BSO, pelvic lymph node sampling, and pelvic external beam radiation. We studied whether the survival and morbidity of patients treated with therapeutic lymphadenectomy are equal to or better than with these alternative treatments. METHODS We reviewed the medical records of patients with stage I endometrial adenocarcinoma who were enrolled in the MetroHealth Medical Center tumor registry between 1970 and 1993 after undergoing full pelvic lymph node dissection, in addition to total abdominal hysterectomy, bilateral salpingo-oophorectomy, and vaginal brachytherapy. The mean number of resected nodes was 33 (median, 31; interquartile range, 19). Patients were followed for 1. 6-20 years (median, 8 years; interquartile range, 5.8 years). Morbidity and survival rates were compared to published series using similar treatment strategies and to those from studies using pelvic external beam radiation and pelvic lymph node sampling rather than lymphadenectomy. RESULTS Of 192 patients with pathologic stage I (FIGO 1988) endometrial adenocarcinoma, 178 patients had full pelvic lymph node dissection; 159 patients were evaluable. The 15-year overall survival was 98%; 10- and 15- year disease-free survivals were 96 and 94%, respectively. Overall morbidity was 18% (29/159), and moderate-to-severe morbidity was 13% (21/159). Recurrences were seen in 4.4% (7/159) of patients. Grade and myometrial invasion were not significant predictors of disease-free survival after full pelvic lymph node dissection (grade, P = 0.42; stage, P = 0.67). The results compare favorably with those of similar studies and with studies of pelvic external beam radiation. CONCLUSIONS Primary surgical management with total abdominal hysterectomy, bilateral salpingo-oophorectomy, therapeutic pelvic lymphadenectomy, and vaginal brachytherapy is a viable and possibly preferable option for patients with stage I endometrial adenocarcinoma.
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Affiliation(s)
- D S Mohan
- Department of Radiation Oncology, University Hospitals of Cleveland/Case Western Reserve University, Cleveland, Ohio 44106, USA
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