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Gwag HB, Park SJ, Park KM, On YK, Kim JS. 847Interim analysis of the device-detected cardiac tachyarrhythmic events and sleep-disordered breathing (DEDiCATES)" study; focused on baseline characteristics. Europace 2020. [DOI: 10.1093/europace/euaa162.352] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
This work is supported by Boston Scientific.
Background/introduction: Sleep-disordered breathing (SDB) is one of the common comorbidities in cardiac implantable electronic devices (CIED) patients. It’s feasible to detect SDB using specialized diagnostic function of CIEDs showing comparable performance in diagnostic accuracy of SDB to conventional polysomnography. To date, few studies have investigated the prognostic value of CIED-detected SDB in cardiovascular risk.
Purpose
In the Device-Detected CArdiac Tachyarrhythmic events and Sleep-disordered breathing (DEDiCATES) study, we aim to determine whether device-detected sleep-disordered breathing (SDB) events are associated with increased risk of cardiac arrhythmias or other cardiovascular (CV) outcomes. Here, we present interim baseline data of the study population to investigate the baseline prevalence and severity of device-detected SDB in CIED patients.
Methods
The study was designed as a prospective, multicenter, and observational study to include 600 patients. Eligible patients have dual chamber CIEDs with SDB detection function which reports the average number of sleep disturbance events per hour per night in the form of a Respiratory Disturbance Index (RDI). The daily RDI values were collected to measure the severity and burden of SDB. The baseline severity of SDB was determined according to RDI data recorded during the first 1 week, 1 month, and 3 ± 1 months after CIED implantation; patients with RDI≥ 30/h for at least one night are classified into the severe SDB group.
Results
A total of 313 patients who completed the first device interrogation at 3 ± 1 months were included for analysis. The mean age and CHA2DS2VASc score were 69 and 3.1, respectively. Forty-nine percent of patients were men, and 35.5% were classified as high risk for SDB by Berlin questionnaire. The rate of severe SDB increased with longer monitoring period (83.8% at 1week, 91.6% at 1 month, and 96.4% at 3 ± 1 months). There was no baseline demographic difference between the severe and non-severe SDB groups, except that baseline body mass index (BMI) was higher in the severe group (24.5% vs. 21.5%, p = 0.01). The mean RDI was 36.3, 34.2, and 33.0 per night during the first 1 week, 1 month, and 3 ± 1 months, respectively. Considering the limitation of the categorical criteria of baseline severity, we arbitrarily reclassified the patients according to median mean RDI value. Men were more frequent and BMI was higher in the above-mean RDI group compared to the below-mean RDI group. Using logistic regression analysis, we identified that BMI and male gender were associated with patients with above-mean RDI.
Conclusions
Conventional categorical classification of SDB severity seems to be limited in its ability to discriminate high risk patients. Thus, more suitable RDI-related variables need to be identified in future outcome analysis.
Abstract Figure. Prevalence of baseline severe SDB
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Affiliation(s)
- H B Gwag
- Samsung Changwon Hospital, Changwon, Korea (Republic of)
| | - S J Park
- Samsung Medical Center, Cardiology, Seoul, Korea (Republic of)
| | - K M Park
- Samsung Medical Center, Cardiology, Seoul, Korea (Republic of)
| | - Y K On
- Samsung Medical Center, Cardiology, Seoul, Korea (Republic of)
| | - J S Kim
- Samsung Medical Center, Cardiology, Seoul, Korea (Republic of)
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Kang HJ, Shim S, Han Y, Park KM, Hwang H, Chung YJ, Kim MR, Park JY. 2053 the Fractional CO2 Laser in Korea: An Effective Treatment Option for Genitourinary Syndrome of Menopause. J Minim Invasive Gynecol 2019. [DOI: 10.1016/j.jmig.2019.09.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Lee WS, Choi KJ, Nam GB, Kim YH, Kim J, Kim YH, Kim YR, Park KM. P5752Assessment of force-time integral on radiofrequency lesion size in an in vitro swine contractile model using force sensing technology. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5752] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- W S Lee
- YeoSu Jeil Hospital, YeoSu, Korea Republic of
| | - K J Choi
- Asan Medical Center, Electrophysiology, Seoul, Korea Republic of
| | - G B Nam
- Asan Medical Center, Electrophysiology, Seoul, Korea Republic of
| | - Y H Kim
- Asan Medical Center, Electrophysiology, Seoul, Korea Republic of
| | - J Kim
- Asan Medical Center, Electrophysiology, Seoul, Korea Republic of
| | - Y H Kim
- Asan Medical Center, Electrophysiology, Seoul, Korea Republic of
| | - Y R Kim
- St.Mary's Hospital, Division of Cardiology, Department of Internal Medicine, Incheon, Korea Republic of
| | - K M Park
- Samsung Medical Center, Electrophysiology, Seoul, Korea Republic of
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On YK, Lee DH, Park SJ, Park KM, Kim JS. P2892Clinical outcomes of atrial fibrillation development or progression in patients with permanent pacemakers. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2892] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Y.-K On
- Samsung Medical Center, Sungkyunkwan University, Cardiovascular Center, Seoul, Korea Republic of
| | - D H Lee
- Samsung Medical Center, Sungkyunkwan University, Cardiovascular Center, Seoul, Korea Republic of
| | - S J Park
- Samsung Medical Center, Sungkyunkwan University, Cardiovascular Center, Seoul, Korea Republic of
| | - K M Park
- Samsung Medical Center, Sungkyunkwan University, Cardiovascular Center, Seoul, Korea Republic of
| | - J S Kim
- Samsung Medical Center, Sungkyunkwan University, Cardiovascular Center, Seoul, Korea Republic of
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Park MW, Her SH, Cho JS, Kim TS, Park HW, Kim DW, Park KM, Chang KY. P5587Guideline-recommended optimal medical therapy in AMI patients undergoing PCI with DES: adherence and clinical outcomes using national health insurance data. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5587] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M.-W Park
- Daejun St. Mary's Hospital, Daejun, Korea Republic of
| | - S H Her
- Daejun St. Mary's Hospital, Daejun, Korea Republic of
| | - J S Cho
- Daejun St. Mary's Hospital, Daejun, Korea Republic of
| | - T S Kim
- Daejun St. Mary's Hospital, Daejun, Korea Republic of
| | - H W Park
- Daejun St. Mary's Hospital, Daejun, Korea Republic of
| | - D W Kim
- Daejun St. Mary's Hospital, Daejun, Korea Republic of
| | - K M Park
- Ulsan University Hospital, Ulsan, Korea Republic of
| | - K Y Chang
- Seoul St. Mary's Hospital, Seoul, Korea Republic of
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Chun KJ, Gwag HB, Park SJ, Park KM, On YK, Kim JS. P6650Comparision of transjugular versus transfemoral approach for temporary pacemaker implantation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p6650] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- K J Chun
- Kangnam Sacred Heart Hospital, Seoul, Korea Republic of
| | - H B Gwag
- Samsung Medical Center, Seoul, Korea Republic of
| | - S J Park
- Samsung Medical Center, Seoul, Korea Republic of
| | - K M Park
- Samsung Medical Center, Seoul, Korea Republic of
| | - Y K On
- Samsung Medical Center, Seoul, Korea Republic of
| | - J S Kim
- Samsung Medical Center, Seoul, Korea Republic of
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Park MW, Her SH, Cho JS, Park HW, Kim DW, Kim TS, Park KM, Chang KY. P5576Moderate versus high-intensity statin therapy in east asian patients with angina undergoing PCI with DES: a propensity-score matching analysis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5576] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M.-W Park
- Daejun St. Mary's hospital, Daejun, Korea Republic of
| | - S H Her
- Daejun St. Mary's hospital, Daejun, Korea Republic of
| | - J S Cho
- Daejun St. Mary's hospital, Daejun, Korea Republic of
| | - H W Park
- Daejun St. Mary's hospital, Daejun, Korea Republic of
| | - D W Kim
- Daejun St. Mary's hospital, Daejun, Korea Republic of
| | - T S Kim
- Daejun St. Mary's hospital, Daejun, Korea Republic of
| | - K M Park
- Ulsan University Hospital, Ulsan, Korea Republic of
| | - K Y Chang
- Seoul St. Mary's Hospital, Seoul, Korea Republic of
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Gwag HB, Jeong DS, Hwang JK, Chun KJ, Park SJ, On YK, Kim JS, Park KM. P846Characteristics and outcomes of recurrent atrial tachyarrhythmia after totally thoracoscopic ablation for persistent atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.449] [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: 11/12/2022] Open
Affiliation(s)
- H B Gwag
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - D S Jeong
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - J K Hwang
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - K J Chun
- Kangnam Sacred Heart Hospital, Seoul, Korea Republic of
| | - S J Park
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - Y K On
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - J S Kim
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - K M Park
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
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Gwag HB, Hwang JK, Jeong DS, Park SJ, Kim JS, Park KM, On YK. P845Benefits of concurrent cavotricuspid isthmus ablation after totally thoracoscopic ablation for persistent atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.448] [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: 11/14/2022] Open
Affiliation(s)
- H B Gwag
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - J K Hwang
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - D S Jeong
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - S J Park
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - J S Kim
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - K M Park
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - Y K On
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
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Lee JH, Park KM, Lee YJ, Kim JH, Kim SH. A New Chemical Compound, NecroX-7, Acts as a Necrosis Modulator by Inhibiting High-Mobility Group Box 1 Protein Release During Massive Ischemia-Reperfusion Injury. Transplant Proc 2016; 48:3406-3414. [PMID: 27931589 DOI: 10.1016/j.transproceed.2016.09.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 08/21/2016] [Accepted: 09/14/2016] [Indexed: 12/13/2022]
Abstract
BACKGROUND Necrotic cell death is common in a wide variety of pathologic conditions, including ischemia-reperfusion (IR) injury. The aim of this study was to develop an IR injury-induced hepatic necrosis model in dogs by means of selective left hepatic inflow occlusion and to test the efficacy of a new chemical compound, NecroX-7, against the IR injury-induced hepatic damage. METHODS A group of male Beagle dogs received intravenous infusions of either vehicle or different doses of NecroX-7 (1.5, 4.5, or 13 mg/kg) for a 20-minute period before a 90-minute left hepatic inflow occlusion followed by reperfusion. RESULTS The gross morphology in the NecroX-7-treated groups after occlusion appeared to be less congested and less swollen than that in vehicle-treated control group. Circulating alanine transaminase and aspartate transaminase levels in the control group were elevated during the course of IR, and were effectively blocked in the 4.5 and 13 mg/kg NecroX-7-treated groups. The serum levels of high-mobility group box 1 protein showed a peak at 8 hours after occlusion in control group, and this elevation was significantly blunted by 4.5 mg/kg NecroX-7 treatment. Histologic analysis showed a marked ischemia or IR injury-induced hepatocytic degenerations, sinusoidal and portal vein congestions, and inflammatory cell infiltrations in the control group, whereas the treatment groups showed significantly diminished histopathology in a dose-dependent manner. CONCLUSIONS These results demonstrated that NecroX-7 attenuated the hepatocyte lethality caused by hepatic IR injury in a large animal setting. We conclude that NecroX-7 may provide a wide variety of therapeutic options for IR injury in human patients.
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Affiliation(s)
- J H Lee
- Department of Hepatobiliary and Pancreatic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Korea
| | - K M Park
- Department of Hepatobiliary and Pancreatic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Korea.
| | - Y J Lee
- Department of Hepatobiliary and Pancreatic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Korea
| | - J H Kim
- Department of Pathology, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Korea
| | - S H Kim
- LG Life Sciences, Daejeon, Korea
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Park KM, Hussein KH, Ghim JH, Ahn C, Cha SH, Lee GS, Hong SH, Yang S, Woo HM. Hepatic differentiation of porcine embryonic stem cells for translational research of hepatocyte transplantation. Transplant Proc 2015; 47:775-9. [PMID: 25891729 DOI: 10.1016/j.transproceed.2015.01.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Revised: 01/02/2015] [Accepted: 01/28/2015] [Indexed: 12/28/2022]
Abstract
Porcine embryonic stem cells (ES) are considered attractive preclinical research tools for human liver diseases. Although several studies previously reported generation of porcine ES, none of these studies has described hepatic differentiation from porcine ES. The aim of this study was to generate hepatocytes from porcine ES and analyze their characteristics. We optimized conditions for definitive endoderm induction and developed a 4-step hepatic differentiation protocol. A brief serum-free condition with activin A efficiently induced definitive endoderm differentiation from porcine ES. The porcine ES-derived hepatocyte-like cells highly expressed hepatic markers including albumin and α-fetoprotein, and displayed liver characteristics such as glycogen storage, lipid production, and low-density lipoprotein uptake. For the first time, we describe a highly efficient protocol for hepatic differentiation from porcine ES. Our findings provide valuable information for translational liver research using porcine models, including hepatic regeneration and transplant studies, drug screening, and toxicology.
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Affiliation(s)
- K M Park
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea; College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea
| | - K H Hussein
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea
| | - J H Ghim
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea; College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea
| | - C Ahn
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea; College of Biomedical Science, Kangwon National University, Chuncheon, Korea
| | - S H Cha
- Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang, Korea
| | - G S Lee
- College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea
| | - S H Hong
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea; College of Medicine, Kangwon National University, Chuncheon, Korea
| | - S Yang
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea; College of Medicine, Kangwon National University, Chuncheon, Korea
| | - H M Woo
- Stem Cell Institute, Kangwon National University, Chuncheon, Korea; College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea.
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Ha TY, Hwang S, Kim KH, Lee YJ, Ahn CS, Moon DB, Song GW, Park KM, Kim N, Lee SG. Expression pattern analysis of hepatocellular carcinoma tumor markers in viral hepatitis B and C patients undergoing liver transplantation and resection. Transplant Proc 2015; 46:888-93. [PMID: 24767373 DOI: 10.1016/j.transproceed.2013.12.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Revised: 11/30/2013] [Accepted: 12/11/2013] [Indexed: 12/15/2022]
Abstract
BACKGROUND This study was conducted to compare the expression patterns of serum alpha-fetoprotein (AFP) and proteins induced by vitamin K absence or antagonist-II (PIVKA-II) in hepatocellular carcinoma (HCC) patients undergoing liver transplantation (LT) and resection at a high-volume single institution. METHODS First, 663 liver transplant recipients with HCC were selected. They were divided into hepatitis B virus (HBV) (n = 628) and hepatitis C virus (HCV) groups (n = 35). Their medical records were retrospectively reviewed. Second, another cohort of 2709 patients who underwent HCC resection included 2258 HBV, 143 HCV, and 308 non-HBV non-HCV (NBNC) patients. RESULTS In the transplantation group, pretransplantation AFP level >20 ng/mL was observed in 42.5% of HBV patients and 60% of HCV patients (P = .042). PIVKA-II level >40 mAU/mL was observed in 30.6% of HBV patients and 42.9% of HCV patients (P = .127). In the resection group, a preoperative AFP level >20 ng/mL was observed in 51.7% of HBV patients and 43.3% of HCV patients (P = .052). PIVKA-II level >40 mAU/mL was observed in 59.7% of HBV patients and 56.6% of HCV patients (P = .47). Preoperative AFP level >20 ng/mL and PIVKA-II level >40 mAU/mL were observed in 35.7% and 61% of NBNC patients, respectively. Receiver-operator characteristic curve analyses revealed that the expression pattern of PIVKA-II in patients with elevated AFP level was not predictable and vice versa, regardless of background liver diseases. CONCLUSIONS This study indicates that serum AFP and PIVKA-II may be expressed variably regardless of the types of background liver disease. Further large-volume multicenter studies are needed to evaluate the possibility of the etiology-dependent expression of tumor markers.
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Affiliation(s)
- T Y Ha
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S Hwang
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
| | - K H Kim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Y J Lee
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - C S Ahn
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D B Moon
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G W Song
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K M Park
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - N Kim
- Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S G Lee
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Kim MH, Park KM, Hwang JK, Park SC, Moon IS, Kim JI. The natural history of arteriovenous access and risk factors associated with access thrombosis after successful kidney transplantation. Transplant Proc 2014; 46:602-6. [PMID: 24656023 DOI: 10.1016/j.transproceed.2013.10.056] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Accepted: 10/01/2013] [Indexed: 10/25/2022]
Abstract
INTRODUCTION The purpose of this study was to determine the natural history of arteriovenous (AV) access after successful kidney transplantation (KT) and to identify the risk factors of spontaneous access closure in kidney transplant recipients. METHODS We performed a retrospective review of 115 patients who underwent KT with functioning access from June 2010 to July 2012. AV access patency was checked and recorded daily during the hospital stay and at every visit to the outpatient clinic. Patients were divided into 2 groups according to the patency of access, and risk factors of access thrombosis were assessed. Access patency was followed up until patency was lost or the study was closed. RESULTS At the end of follow-up, 18 (15.7%) AV accesses had spontaneously closed. Mean time to closure was 119 ± 163 days, and 12 of 18 were closed within 90 days after KT. AV access spontaneously closed in 8.5% of male patients, compared with 27.3% of female patients (P = .007), 12.2% of cases with native access compared with 35.3% of cases with artificial access (P = .016), and 11.3% of cases with wrist access compared with 25.7% of cases with elbow access (P = .049). Spontaneously closed AV accesses tended to have a lower mean access flow compared with functioning accesses (P = .019). On multivariate analysis, female sex and AV access flow volume affected spontaneous AV access closure (odds ratio 4.749, 95% confidence interval 1.919-35.383, P = .008; odds ratio 0.998, 95% confidence interval 0.996-0.999, P = .010, respectively). CONCLUSIONS Our results suggest that AV access thrombosis occurs more frequently during the early postoperative period, particularly in female patients or patients with low flow access, whereas it is a rare event in male patients or patients with high access flow, especially in the late postoperative period.
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Affiliation(s)
- M H Kim
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - K M Park
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - J K Hwang
- Department of Surgery, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Korea
| | - S C Park
- Department of Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Uijeongbu, Korea
| | - I S Moon
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - J I Kim
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
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Maki KC, Rains TM, Schild AL, Dicklin MR, Park KM, Lawless AL, Kelley KM. Effects of low-fat dairy intake on blood pressure, endothelial function, and lipoprotein lipids in subjects with prehypertension or stage 1 hypertension. Vasc Health Risk Manag 2013; 9:369-79. [PMID: 23901280 PMCID: PMC3726585 DOI: 10.2147/vhrm.s45684] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
OBJECTIVE This randomized crossover trial assessed the effects of 5 weeks of consuming low-fat dairy (one serving/day each of 1% fluid milk, low-fat cheese, and low-fat yogurt) versus nondairy products (one serving/day each of apple juice, pretzels, and cereal bar) on systolic and diastolic blood pressures (SBP and DBP), vascular function (reactive hyperemia index [RHI] and augmentation index), and plasma lipids. METHODS Patients were 62 men and women (mean age 54.5 years, body mass index 29.2 kg/m(2)) with prehypertension or stage 1 hypertension (mean resting SBP/DBP 129.8 mmHg/80.8 mmHg) while not receiving antihypertensive medications. A standard breakfast meal challenge including two servings of study products was administered at the end of each treatment period. RESULTS Dairy and nondairy treatments did not produce significantly different mean SBP or DBP in the resting postprandial state or from premeal to 3.5 hours postmeal (SBP, 126.3 mmHg versus 124.9 mmHg; DBP, 76.5 mmHg versus 75.7 mmHg), premeal (2.35 versus 2.20) or 2 hours postmeal (2.33 versus 2.30) RHI, and premeal (22.5 versus 23.8) or 2 hours postmeal (12.4 versus 13.2) augmentation index. Among subjects with endothelial dysfunction (RHI ≤ 1.67; n = 14) during the control treatment, premeal RHI was significantly higher in the dairy versus nondairy condition (2.32 versus 1.50, P = 0.002). Fasting lipoprotein lipid values were not significantly different between treatments overall, or in subgroup analyses. CONCLUSION No significant effects of consuming low-fat dairy products, compared with low-fat nondairy products, were observed for blood pressures, measures of vascular function, or lipid variables in the overall sample, but results from subgroup analyses were consistent with the hypothesis that dairy foods might improve RHI in those with endothelial dysfunction.
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Affiliation(s)
- Kevin C Maki
- Biofortis Clinical Research, Addison, IL 60101, USA.
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Zhang L, Malik S, Pang J, Wang H, Park KM, Yule DI, Blaxall BC, Smrcka AV. Phospholipase Cε hydrolyzes perinuclear phosphatidylinositol 4-phosphate to regulate cardiac hypertrophy. Cell 2013; 153:216-27. [PMID: 23540699 DOI: 10.1016/j.cell.2013.02.047] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 01/22/2013] [Accepted: 02/14/2013] [Indexed: 01/08/2023]
Abstract
Phospholipase Cε (PLCε) is a multifunctional enzyme implicated in cardiovascular, pancreatic, and inflammatory functions. Here we show that conditional deletion of PLCε in mouse cardiac myocytes protects from stress-induced pathological hypertrophy. PLCε small interfering RNA (siRNA) in ventricular myocytes decreases endothelin-1 (ET-1)-dependent elevation of nuclear calcium and activation of nuclear protein kinase D (PKD). PLCε scaffolded to muscle-specific A kinase-anchoring protein (mAKAP), along with PKCε and PKD, localizes these components at or near the nuclear envelope, and this complex is required for nuclear PKD activation. Phosphatidylinositol 4-phosphate (PI4P) is identified as a perinuclear substrate in the Golgi apparatus for mAKAP-scaffolded PLCε. We conclude that perinuclear PLCε, scaffolded to mAKAP in cardiac myocytes, responds to hypertrophic stimuli to generate diacylglycerol (DAG) from PI4P in the Golgi apparatus, in close proximity to the nuclear envelope, to regulate activation of nuclear PKD and hypertrophic signaling pathways.
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Affiliation(s)
- Lianghui Zhang
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA
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16
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Abstract
The Dietary Guidelines for Americans, 2010 indicated there is moderate evidence for an association between the consumption of dairy foods and lower blood pressure in adults; however, it also stated that more evidence was needed, especially in clinical trials, to fully delineate a causal relationship. The purpose of this review is to provide background by examining the historical literature and the evidence reviewed by the 2010 Dietary Guidelines Advisory Committee, to examine the gaps in knowledge indicated by that committee, and to determine if recently published evidence is sufficient to elucidate or dismiss an association between dairy foods and blood pressure maintenance. Examination of the newly published literature, together with evaluation of the evidence as a whole, shows that the preponderance of evidence indicates dairy foods are beneficially associated with blood pressure; however, additional research is necessary to identify the mechanism of action of dairy foods. New evidence should come from carefully designed clinical trials that examine not only blood pressure outcomes but also the ability of dairy foods to affect the vasculature.
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Affiliation(s)
- Keigan M Park
- Dairy Research Institute, Rosemont, Illinois 60018-5616, USA
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17
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Maki KC, Fulgoni VL, Keast DR, Rains TM, Park KM, Rubin MR. Vitamin D Intake and Status Are Associated with Lower Prevalence of Metabolic Syndrome in U.S. Adults: National Health and Nutrition Examination Surveys 2003–2006. Metab Syndr Relat Disord 2012; 10:363-72. [DOI: 10.1089/met.2012.0020] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | | | - Debra R. Keast
- Food & Nutrition Database Research Inc., Okemos, Michigan
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18
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Abstract
Porcine organs are attractive for xenotransplantation, if severe immunologic concerns can be overcome. Recently, reengineered organs, with heterologous cellular materials removed but preserved organ architecture and vasculature have been created using small rodents in an effort to produce customized bioengineered organs. However, few studies have been performed to generate bioengineered organs from porcine sources. The aim of this work was to produce 3-D bioengineered scaffolds from major porcine organs, preserving the native morphology and vascular structures with complete removal of cellular and nuclear materials. We decellularized porcine heart, liver, and kidney using a peristaltic pump system with 1% sodium dodecyl sulfate. The preservation of major architecture and vasculature was confirmed by gross findings, ultrasonography, and angiography. Hematoxylin and eosin staining revealed no evidence of nuclear or cytoplasmic residues. Quantitative DNA analysis demonstrated a substantial reduction (0%-8%) of porcine DNA in the scaffolds. These results suggested that 3-D bioengineered scaffolds of porcine organs may have tremendous potential to produce non-immunogenic transplantable organs as well as beneficial tools for biomedical studies on organ re-engineering and repair.
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Affiliation(s)
- K M Park
- Stem Cell Institute-KNU, Kangwon National University, Chuncheon, Korea
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19
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Abstract
Although evidence has linked the consumption of saturated fat (SF) to increased LDL levels and an increased risk of the development of cardiovascular disease (CVD), recent findings have indicated that the link between CVD and SF may be less straightforward than originally thought. This may be due to the fact that some food sources high in SF contain an array of saturated and unsaturated fatty acids, each of which may differentially affect lipoprotein metabolism, as well as contribute significant amounts of other nutrients, which may alter CVD risk. The purpose of this review is to examine the published research on the relationship between milk fat containing dairy foods and cardiovascular health. The findings indicate that the majority of observational studies have failed to find an association between the intake of dairy products and increased risk of CVD, coronary heart disease, and stroke, regardless of milk fat levels. Results from short-term intervention studies on CVD biomarkers have indicated that a diet higher in SF from whole milk and butter increases LDL cholesterol when substituted for carbohydrates or unsaturated fatty acids; however, they may also increase HDL and therefore might not affect or even lower the total cholesterol:HDL cholesterol ratio. The results from the review also indicate that cheese intake lowers LDL cholesterol compared with butter of equal milk fat content. In addition, the review highlights some significant gaps in the research surrounding the effects of full-fat dairy on CVD outcomes, pointing to the need for long-term intervention studies.
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Affiliation(s)
| | - Keigan M. Park
- Dairy Research Institute, Rosemont, IL,To whom correspondence should be addressed. E-mail:
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20
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Kim KH, Jung DH, Park KM, Lee YJ, Kim DY, Kim KM, Lee SG. Comparison of open and laparoscopic live donor left lateral sectionectomy. Br J Surg 2011; 98:1302-8. [PMID: 21717424 DOI: 10.1002/bjs.7601] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2011] [Indexed: 12/14/2022]
Abstract
BACKGROUND The present study was undertaken to determine whether laparoscopic live donor left lateral sectionectomy (LLS) in paediatric liver transplantation is a feasible, safe and reproducible procedure, compared with open live donor left lateral sectionectomy (OLS). METHODS A retrospective review was conducted of all consecutive live donor procedures for paediatric liver transplantation performed between May 2008 and October 2009. All live donor hepatectomies were carried out by a single surgeon. RESULTS A total of 26 live donor procedures for paediatric liver transplantation were performed, of which 11 were LLS and 11 OLS; four left hepatectomies were excluded. The LLS group had a significantly shorter hospital stay (mean(s.d.) 6·9(0·3) versus 9·8(0·9) days; P = 0·001) and time to oral diet (2·1(0·3) versus 2·7(0·4) days; P = 0·012). Duration of operation, blood loss, warm ischaemia time and out-of-pocket medical costs were comparable between groups. There was no death in either donor group and only one complication, a wound seroma, in the OLS group. CONCLUSION LLS seemed to be a safe, feasible and reproducible procedure, and was associated with reduced hospital stay.
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Affiliation(s)
- K H Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, University of Ulsan College of Medicine and Asan Medical Centre, Songpa-gu, Seoul, Korea.
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21
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Ronchi CBB, Ronchi CF, Correa CR, Cho SM, Park KM, Rasmussen H, Saltzman E, Yeum K. Modification of Antioxidant Status by Ingesting Angelica keiskei (Ak) and/or Glycine max (Gm) in Subjects with Metabolic syndrome (MS). FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.106.8] [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)
| | | | | | - S M Cho
- RDANational Academy Agricultural ScienceBostonMA
| | - K M Park
- HNRCDept. Food Sci BiotechBostonMA
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22
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Zhang L, Malik S, Park KM, Kapiloff MS, Yule DI, Smrcka AV. Phospholipase C
ε
Regulates Multiple Agonists‐Induced Cardiomyocyte Hypertrophy in Neonatal Rat Ventricular Myocytes By Binding To mAKAP (Muscle A‐Kinase Anchoring Protein) And Generating Local IP3‐Dependent Nuclear Calcium Release. FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.1012.1] [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)
- Lianghui Zhang
- Pharmacology and physiologyUniversity of Rochester Medical CenterRochesterNY
| | - Sundeep Malik
- Pharmacology and physiologyUniversity of Rochester Medical CenterRochesterNY
| | - Keigan M Park
- Pharmacology and physiologyUniversity of Rochester Medical CenterRochesterNY
| | - Michael S Kapiloff
- Department of Pediatrics and MedicineUniversity of Miami Miller School of MedicineMiamiFL
| | - David I Yule
- Pharmacology and physiologyUniversity of Rochester Medical CenterRochesterNY
| | - Alan V Smrcka
- Pharmacology and physiologyUniversity of Rochester Medical CenterRochesterNY
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23
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Choi JM, Park KM, Kim SH, Hwang DW, Chon SH, Lee JH, Lee SY, Lee YJ. Effect of necrosis modulator necrox-7 on hepatic ischemia-reperfusion injury in beagle dogs. Transplant Proc 2011; 42:3414-21. [PMID: 21094788 DOI: 10.1016/j.transproceed.2010.08.050] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 07/29/2010] [Accepted: 08/26/2010] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The liver is susceptible to ischemia-reperfusion (IR) injury during inflow occlusion for hepatectomy. There is no effective pharmacologic agent available to prevent the release of high-mobility-group box 1 (HMGB1) or to ameliorate IR injury. This pilot study sought to develop a model in beagle dogs for the purpose of testing the efficacy of a necrosis modulator, necrox-7, to prevent hepatic IR injury in beagle dogs. METHODS Six male beagle dogs were randomly assigned to the control group (group A; n = 3) or the treatment group (group B; n = 3). Under general anesthesia, group B received intravenous infusion of necrox-7 (13 mg/kg over 20 minutes) followed by 60 minutes of left hepatic inflow occlusion and 60 minutes of reperfusion. Both groups were tested for serum biochemicals, hematology values, liver biopsies, and plasma HMGB1 levels over a 48-hour period. RESULTS The maximum alanine transferase (ALT), aspartate transferase (AST), and lactate dehydrogenase (LDH) levels among group A versus group B were: ALT 868.3 ± 337.4 IU/L vs 274.3 ± 72.6 IU/L (P = .041); AST 1,024.7 ± 246.5 IU/L vs 505.3 ± 66.7 IU/L (P = .024); and LDH 962.7 ± 226.2 IU/L vs 552.7 ± 62.4 IU/L (P = .039). Liver biopsy demonstrated marked necrosis and inflammatory infiltrates in group A, whereas group B showed little evidence of IR injury. The plasma HMGB1 concentration was significantly lower among group B versus A. CONCLUSION This pilot study developed a hepatic IR injury model, demonstrating that necrox-7 reduced hepatic necrosis secondary to IR injury in a large animal setting.
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Affiliation(s)
- J M Choi
- Division of Hepatobiliary and Pancreas Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
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24
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Lee HW, Kim DW, Phapale PB, Lim MS, Park J, Seo JJ, Park KM, Park YK, Yoon YR. In vitro inhibitory effects of Wen-pi-tang-Hab-Wu-ling-san on human cytochrome P450 isoforms. J Clin Pharm Ther 2010; 36:496-503. [PMID: 21729114 DOI: 10.1111/j.1365-2710.2010.01201.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
WHAT IS KNOWN AND OBJECTIVE Although Wen-pi-tang-Hab-Wu-ling-san (WHW), an oriental herbal medicine, has been prescribed for the treatment of chronic renal failure (CRF) in Korean clinics, no studies regarding WHW-drug interactions had been reported. The purpose of this study was to evaluate the possibility that WHW inhibits the catalytic activities of major cytochrome P450 (CYP) isoforms. METHODS The abilities of various WHW extracts to inhibit phenacetin O-de-ethylation (CYP1A2), tolbutamide 4-methylhydroxylation (CYP2C9), omeprazole 4'-hydroxylation (CYP2C19), dextromethorphan O-demethylation (CYP2D6), chlorzoxazone 6-hydroxylation (CYP2E1) and midazolam 1-hydroxylation (CYP3A4) were assessed using human liver microsomes. RESULTS AND DISCUSSION WHW extract at concentrations up to 100 μm showed negligible inhibition of the six CYP isoforms tested (CYP1A2, CYP2C9, CYP2C19, CYP2D6, CYP2E1 and CYP3A4), with apparent IC(50) values (concentration of the inhibitor causing 50% inhibition of the original enzyme activity) of 817.5, 601.6, 521.7, 310.2, 342.8 and 487.0 μg/mL, respectively. WHAT IS NEW AND CONCLUSION Our in vitro findings suggest that WHW extract at concentrations corresponding to a clinically recommended dosage range has no notable inhibitory effects on CYP isoforms. Therefore, we believe that WHW extract may be free of drug-herb interactions when co-administered with other medicines. However, in vivo human studies are needed to confirm these results.
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Affiliation(s)
- H W Lee
- Department of Biomedical Science, Kyungpook National University Graduate School, Junggu, Daegu, South Korea
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25
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Abstract
Tumor necrosis factor-alpha (TNF-alpha) is a potent pro-inflammatory molecule, which upon engagement with its cognate receptors on target cells, triggers downstream signaling cascades that control a number of cellular processes related to cell viability, gene expression, ion homeostasis, and synaptic integrity. In the central nervous system (CNS), TNF-alpha is produced by brain-resident astrocytes, microglia, and neurons in response to numerous intrinsic and extrinsic stimuli. This review will summarize the key events that lead to TNF-alpha elaboration in the CNS, and the effects that these inflammatory signals impart on neuronal signaling in the context of homeostasis and neuropathology.
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Affiliation(s)
- Keigan M. Park
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, New York 14642 USA
- Center for Neural Development and Disease, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
| | - William J. Bowers
- Department of Neurology, University of Rochester Medical Center, Rochester, New York 14642 USA
- Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, New York 14642 USA
- Department of Pharmacology and Physiology, University of Rochester Medical Center, Rochester, New York 14642 USA
- Center for Neural Development and Disease, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
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26
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Aldini G, Regazzoni L, Scevaroli M, Carini M, Chun HK, Cho SM, Park KM, Yeum K. An integrated high resolution mass spectrometric and bioinformatic approach for the rapid identification of flavonoids in plant extract. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.921.6] [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)
- G Aldini
- Dipartimento di Scienze Farmaceutiche “Pietro Pratesi”Univ MilanMilanItaly
| | - L Regazzoni
- Dipartimento di Scienze Farmaceutiche “Pietro Pratesi”Univ MilanMilanItaly
| | - M Scevaroli
- Dipartimento di Scienze Farmaceutiche “Pietro Pratesi”Univ MilanMilanItaly
| | - M Carini
- Dipartimento di Scienze Farmaceutiche “Pietro Pratesi”Univ MilanMilanItaly
| | - HK Chun
- Natl Acad Agricul Sci, Rural Develop AdminSuwonRepublic of Korea
| | - SM Cho
- Natl Acad Agricul Sci, Rural Develop AdminSuwonRepublic of Korea
| | - KM Park
- Dept Food Sci BiotechSungkyunkwan UnivSuwonRepublic of Korea
| | - K‐J Yeum
- Jean Mayer USDA‐Human Nutr Res Ctr on AgingTufts UnivBostonMA
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27
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Switkowski KM, Camacho CRC, Chen O, Rasmussen H, Aldini G, Chun HK, Cho S, Park KM, Russell R, Saltzman E, Blumberg J, Yeum K. Absorption kinetics of polyphenols and alteration of antioxidant performance in older adults after ingesting Angelica keiskei. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.321.6] [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)
| | | | - Oliver Chen
- Jean Mayer USDA‐Human Res Ctr on AgingTufts UnivBostonMA
| | | | - Giancarlo Aldini
- Dipartimento di Scienze Farmaceutiche “Pietro Pratesi”Universita' degli Studi di MilanoMilanItaly
| | - HK Chun
- Rural Development AdministrationNational Academy of Agricultural ScienceSuwonRepublic of Korea
| | - Soomuk Cho
- Rural Development AdministrationNational Academy of Agricultural ScienceSuwonRepublic of Korea
| | - KM Park
- Dept Food Science and BiotechnologySungkyunkwan UniversitySewonRepublic of Korea
| | - Robert Russell
- Jean Mayer USDA‐Human Res Ctr on AgingTufts UnivBostonMA
| | | | | | - Kyung‐Jin Yeum
- Jean Mayer USDA‐Human Res Ctr on AgingTufts UnivBostonMA
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28
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Park KM, Yule DI, Bowers WJ. Impaired TNF-alpha control of IP3R-mediated Ca2+ release in Alzheimer's disease mouse neurons. Cell Signal 2010; 22:519-26. [PMID: 19922794 PMCID: PMC2794907 DOI: 10.1016/j.cellsig.2009.11.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 11/09/2009] [Indexed: 12/24/2022]
Abstract
The misguided control of inflammatory signaling has been previously implicated in the pathogenesis of several neurological disorders, including Alzheimer's disease (AD). Induction of tumor necrosis factor-alpha (TNF-alpha), a central mediator of neuroinflammation, occurs commensurate with the onset of early disease in 3xTg-AD mice, which develop both amyloid plaque and neurofibrillary tangle pathologies in an age- and region-dependent pattern. Herein, we describe regulation inherent to 3xTg-AD neurons, which results in the loss of TNF-alpha mediated enhancement of inositol 1,4,5 trisphosphate (IP3R)-mediated Ca2+ release. This modulation also leads to significant down-regulation of IP3R signaling following protracted cytokine exposure. Through the experimental isolation of each AD-related transgene, it was determined that expression of the PS1M146V transgene product is responsible for the loss of the TNF-alpha effect on IP3R-mediated Ca2+ release. Furthermore, it was determined that the suppression of TNF-alpha receptor expression occurred in the presence of the presenilin transgene. Our findings attribute this familial AD mutation to suppressing a Ca2+-regulated signal cascade potentially intended to "inform" neurons of proximal neuroinflammatory events and trigger compensatory responses for protection of neural transmission.
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MESH Headings
- Alzheimer Disease/metabolism
- Animals
- Calcium/metabolism
- Cells, Cultured
- Inositol 1,4,5-Trisphosphate/metabolism
- Inositol 1,4,5-Trisphosphate Receptors/metabolism
- Mice
- Neurons/metabolism
- Presenilins/metabolism
- RNA, Small Interfering/metabolism
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type I/metabolism
- Receptors, Tumor Necrosis Factor, Type II/genetics
- Receptors, Tumor Necrosis Factor, Type II/metabolism
- Tumor Necrosis Factor-alpha/metabolism
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Affiliation(s)
- Keigan M. Park
- Department of Pharmacology and Physiology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
- Center for Neural Development and Disease, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
| | - David I. Yule
- Department of Pharmacology and Physiology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
| | - William J. Bowers
- Department of Neurology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
- Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
- Center for Neural Development and Disease, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642 USA
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29
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Park KM, Yule DI, Bowers WJ. Tumor necrosis factor-alpha-mediated regulation of the inositol 1,4,5-trisphosphate receptor promoter. J Biol Chem 2009; 284:27557-66. [PMID: 19666470 DOI: 10.1074/jbc.m109.034504] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tumor necrosis factor-alpha (TNF-alpha), a proinflammatory cytokine, has been implicated as a central mediator in multiple homeostatic and pathologic processes. Signaling cascades downstream of its cellular cognate receptors, as well as the resultant transcriptional responses have received intense interest in regards to how such signals impact cellular physiology. Notably, TNF-alpha was shown to potentiate neuronal Ca(2+) signaling by enhancing type-1 inositol 1,4,5-trisphosphate receptor (IP(3)R) steady-state mRNA levels. In the present study, we sought to determine the promoter region ultimately responsive to TNF-alpha exposure. We report that a sequence encompassing a specificity protein 1 (SP-1) binding site is necessary for TNF-alpha regulation. Electrophoretic mobility shift analysis demonstrated specific binding to this sequence, while site-directed mutagenesis of this site abrogated both JNK-mediated regulation as well as transcription factor binding. Expression of a dominant-negative SP-1 eliminated both the enhanced promoter activity and the elevated IP(3)R-mediated Ca(2+) signals observed with TNF-alpha exposure. Overall, these data delineate a key pathway by which TNF-alpha in a neuronal environment modulates IP(3)R expression and intracellular Ca(2+) homeostasis.
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Affiliation(s)
- Keigan M Park
- Department of Neurology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642, USA
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30
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Whitley SA, Moyes VJ, Park KM, Brooke AM, Grossman AB, Chew SL, Rockall AG, Monson JP, Reznek RH. The appearance of the adrenal glands on computed tomography in multiple endocrine neoplasia type 1. Eur J Endocrinol 2008; 159:819-24. [PMID: 18827064 DOI: 10.1530/eje-08-0516] [Citation(s) in RCA: 15] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
AIMS To review the morphology of the adrenal glands in multiple endocrine neoplasia type 1 (MEN1) on computed tomography (CT) to compare the results with established normal values for adrenal size and nodularity and to correlate adrenal size with serum cortisol secretory dynamics. MATERIALS AND METHODS Two observers independently reviewed the adrenal CT in 28 patients with MEN1, measuring the maximum width of the body of the gland and the medial and lateral limbs. Incidence and location of nodules >5 mm within the gland were recorded. Following exclusion of known cases of Cushing's syndrome, adrenal gland size was compared with previously documented normative data. Adrenal gland size was compared between patients with normal and abnormal cortisol dynamics. RESULTS Comparison of mean adrenal size in MEN1 patients with normative data showed that the adrenal limbs were significantly larger in MEN1 than normal (P<0.0001 in all four limbs). Adrenal body was also significantly larger (P<0.05). Nodules were demonstrated in 17 (60%) of patients (versus 0.4-2% in the normal population). No statistically significant correlation was demonstrated between adrenal limb hyperplasia and abnormal cortisol dynamics. CONCLUSIONS In patients with MEN1, adrenal limb hyperplasia and adrenal nodules are significantly more common than in the normal population, a phenomenon not previously documented in a quantitative manner. There was no significant correlation between adrenal limb hyperplasia and abnormal cortisol dynamics.
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Affiliation(s)
- S A Whitley
- Department of Diagnostic Imaging, St Bartholomew's Hospital, Barts and the London NHS Trust and QMUL, London, UK
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Park KM, Yule DI, Bowers WJ. Tumor necrosis factor-alpha potentiates intraneuronal Ca2+ signaling via regulation of the inositol 1,4,5-trisphosphate receptor. J Biol Chem 2008; 283:33069-79. [PMID: 18838384 PMCID: PMC2586262 DOI: 10.1074/jbc.m802209200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 09/12/2008] [Indexed: 01/01/2023] Open
Abstract
Inflammatory events have long been implicated in initiating and/or propagating the pathophysiology associated with a number of neurological diseases. In addition, defects in Ca2+-handling processes, which shape membrane potential, influence gene transcription, and affect neuronal spiking patterns, have also been implicated in disease progression and cognitive decline. The mechanisms underlying the purported interplay that exists between neuroinflammation and Ca2+ homeostasis have yet to be defined. Herein, we describe a novel neuron-intrinsic pathway in which the expression of the type-1 inositol 1,4,5-trisphosphate receptor is regulated by the potent pro-inflammatory cytokine tumor necrosis factor-alpha. Exposure of primary murine neurons to tumor necrosis factor-alpha resulted in significant enhancement of Ca2+ signals downstream of muscarinic and purinergic stimulation. An increase in type-1 inositol 1,4,5-trisphosphate receptor mRNA and protein steady-state levels following cytokine exposure positively correlated with this alteration in Ca2+ homeostasis. Modulation of Ca2+ responses arising from this receptor subtype and its downstream effectors may exact significant consequences on neuronal function and could underlie the compromise in neuronal activity observed in the setting of chronic neuroinflammation, such as that associated with Parkinson disease and Alzheimer disease.
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Affiliation(s)
- Keigan M Park
- Center for Neural Development and Disease, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York 14642, USA
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32
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Janelsins MC, Mastrangelo MA, Park KM, Sudol KL, Narrow WC, Oddo S, LaFerla FM, Callahan LM, Federoff HJ, Bowers WJ. Chronic neuron-specific tumor necrosis factor-alpha expression enhances the local inflammatory environment ultimately leading to neuronal death in 3xTg-AD mice. Am J Pathol 2008; 173:1768-82. [PMID: 18974297 DOI: 10.2353/ajpath.2008.080528] [Citation(s) in RCA: 177] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Inflammatory mediators, such as tumor necrosis factor-alpha (TNF-alpha) and interleukin-1beta, appear integral in initiating and/or propagating Alzheimer's disease (AD)-associated pathogenesis. We have previously observed a significant increase in the number of mRNA transcripts encoding the pro-inflammatory cytokine TNF-alpha, which correlated to regionally enhanced microglial activation in the brains of triple transgenic mice (3xTg-AD) before the onset of overt amyloid pathology. In this study, we reveal that neurons serve as significant sources of TNF-alpha in 3xTg-AD mice. To further define the role of neuronally derived TNF-alpha during early AD-like pathology, a recombinant adeno-associated virus vector expressing TNF-alpha was stereotactically delivered to 2-month-old 3xTg-AD mice and non-transgenic control mice to produce sustained focal cytokine expression. At 6 months of age, 3xTg-AD mice exhibited evidence of enhanced intracellular levels of amyloid-beta and hyperphosphorylated tau, as well as microglial activation. At 12 months of age, both TNF receptor II and Jun-related mRNA levels were significantly enhanced, and peripheral cell infiltration and neuronal death were observed in 3xTg-AD mice, but not in non-transgenic mice. These data indicate that a pathological interaction exists between TNF-alpha and the AD-related transgene products in the brains of 3xTg-AD mice. Results presented here suggest that chronic neuronal TNF-alpha expression promotes inflammation and, ultimately, neuronal cell death in this AD mouse model, advocating the development of TNF-alpha-specific agents to subvert AD.
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Affiliation(s)
- Michelle C Janelsins
- Department of Microbiology and Immunology, Center for Neural Development and Disease, University of Rochester Medical Center, Rochester, NY 14642, USA
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33
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Park KM, Yule DI, Bowers WJ. P3‐370: Tumor necrosis factor‐alpha potentiates neuronal muscarinic Ca2+ signals via regulation of inositol 1,4,5‐trisphosphate receptor expression. Alzheimers Dement 2008. [DOI: 10.1016/j.jalz.2008.05.1940] [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: 10/21/2022]
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Mohanty TR, Seo KS, Park KM, Choi TJ, Choe HS, Baik DH, Hwang IH. Molecular variation in pigmentation genes contributing to coat colour in native Korean Hanwoo cattle. Anim Genet 2008; 39:550-3. [PMID: 18557975 DOI: 10.1111/j.1365-2052.2008.01746.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Pigmentation genes such as TYR (tyrosinase), TYRP1 (tyrosinase-related protein 1), DCT (previously TYRP2, or tyrosinase-related protein 2), ASIP (agouti) and MC1R (melanocortin receptor 1) play a major role in cattle coat colour. To understand the genotypic profile underlying coat colour in native Korean Hanwoo cattle and Angus black cattle, portions of the above-mentioned genes were amplified. Sequence analysis revealed variation in the TYRP1 (exon 5) and MC1R genes. Restriction enzyme analysis of these two genes could distinguish between different colours of Hanwoo cattle. Quantitative estimates of melanin and eumelanin in hair from three different-coloured Hanwoo phenotypes and Angus black showed significant differences at the breed and phenotypic levels. Finally, sequence variants in MC1R were associated with total melanin and eumelanin in breeds as well as in Hanwoo phenotypes.
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Affiliation(s)
- T R Mohanty
- Department of Animal Resources and Biotechnology, Chonbuk National University, Jeonju City, Korea
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Abstract
To determine the frequency and aetiology of acute symptomatic seizures in central nervous system (CNS) infections and to assess the clinical factors predicting the occurrence of the seizures, we retrospectively reviewed the medical records of patients diagnosed with CNS infections from 2000 to 2005. One hundred and forty-seven patients were included in the study. The clinical variables between those with and without acute symptomatic seizures were compared. Of the 147 patients, 23% (34/147) had acute symptomatic seizures. A significant relation between clinical variables and the occurrence of acute symptomatic seizures was found: encephalitis as the aetiology of the CNS infection, Glasgow Coma Scale (GCS) < or =12, and neurological deficits. By multiple logistic regression analysis, age of onset >42 years, encephalitis, and GCS < or =12 were found to be independently significant clinical variables for predicting the occurrence of acute symptomatic seizures. Encephalitis and GCS < or =12 are significant clinical variables for predicting the occurrence of acute symptomatic seizures in CNS infection, suggesting that patients with a greater extent of parenchymal damage are more vulnerable to acute symptomatic seizures.
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Affiliation(s)
- M A Kim
- Department of Neurology, Inje University, Busan Paik Hospital, Busan, Korea
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Hwang S, Lee SG, Ahn CS, Kim KH, Moon DB, Ha TY, Park KM, Song GW, Jung DH, Kim BS, Moon KM. Small-sized liver graft does not increase the risk of hepatocellular carcinoma recurrence after living donor liver transplantation. Transplant Proc 2007; 39:1526-9. [PMID: 17580180 DOI: 10.1016/j.transproceed.2007.03.066] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [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: 08/15/2006] [Accepted: 03/20/2007] [Indexed: 01/11/2023]
Abstract
PURPOSE Following implantation into adult recipients, living donor liver grafts usually undergo liver regeneration. This regeneration process may provoke the growth of occult hepatocellular carcinoma (HCC) cells in the recipient body. To assess the risk of HCC recurrence, we analyzed the influence of graft-recipient weight ratio (GRWR). METHODS The 181 recipients with HCC within the University of California at San Francisco (UCSF) criteria were divided into four groups according to GRWR: low GRWR (<0.8; n = 30), mid GRWR (0.8-1.0; n = 65), high GRWR (>1.0; n = 64), and whole liver graft group (>1.5; n = 22). RESULTS There were no differences in overall patient survival (P = .105) and recurrence-free survival (P = .406) among these four groups. GRWR <0.8 was not a significant risk factor for HCC recurrence. Similar outcomes were obtained in HCC patients who met the Milan criteria (n = 170). CONCLUSIONS We think that small living donor liver graft and subsequent liver regeneration do not increase the risk of posttransplant HCC recurrence when HCC is within the Milan or UCSF criteria.
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Affiliation(s)
- S Hwang
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap-Dong, Seoul 138-736, Republic of Korea
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Kim KH, Lee SG, Lee YJ, Park KM, Hwang S, Ahn CS, Moon DB, Ha TY, Song KW, Kim DS, Jung DH, Kim BS, Moon KM, Lee HJ, Park JI, Ryu JH. Suitable whole blood levels 2 hours after neoral in liver transplant patients: experiences at a single center. Transplant Proc 2007; 38:2971-3. [PMID: 17112877 DOI: 10.1016/j.transproceed.2006.08.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 04/23/2006] [Indexed: 11/23/2022]
Abstract
UNLABELLED Whole blood levels 2 hours after Neoral (C2) administration were observed to correlate better with area under the curve (AUC(0-4)) than trough levels (C0), suggesting that C2 may be the best single time point predictor of Neoral absorption. Owing to concerns about drug toxicity due to excessive immunosuppression, C2 adjustments to target blood levels may represent an advance. The present study measured C2 and levels to determine which correlated more closely with AUC(0-4). METHODS Between August 2003 and July 2004, 40 adult liver transplantations were performed in our center. All patients received Neoral twice daily. They were maintained at a C0 level of about 200 ng/mL. C0 levels were measured daily. C2 levels were estimated on postoperative days 3, 5, 7, 14, and 28. AUC(0-4) performed on postoperative days 3, 7, and 28 was calculated using the trapezoidal rule. RESULTS The mean AUC(0-4), C0, C1, C2, C3, and C4 were 1100.3 +/- 484.8 ng/mL, 197.1 +/- 84.7 ng/mL, 240.7 +/- 166.2 ng/mL, 307.8 +/- 162.6 ng/mL, 302.8 +/- 138.9 ng/mL, and 300.3 +/- 142.8 ng/mL, respectively. C2 correlated with AUC(0-4) (R2 = 0.868: P < .05) better than C0 (R2 = 0.245: P < .05), C1 (R2 = 0.604: P < .05), or C4 (R2 = 0.583: P < .05). CONCLUSIONS Neoral dose monitoring according to a mean C2 range of 307.8 +/- 162.6 ng/mL correlated better with AUC(0-4). Further studies are required to determine suitable C2 levels in liver transplant patients.
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Affiliation(s)
- K H Kim
- Division of HBP Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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Lee JC, Kim JE, Park KM, Khang G. Evaluation of the methods for pupil size estimation: on the perspective of autonomic activity. Conf Proc IEEE Eng Med Biol Soc 2007; 2004:1501-4. [PMID: 17271981 DOI: 10.1109/iembs.2004.1403461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The purpose of This work is to find the optimal calculation method about pupil size to estimate an activity of autonomic nerve system. To evaluate its state, we have to calculate an accurate pupil size from the image of free-rotated and yawed eye for 5 minutes. But calculation of the pupil size from image takes a long time. So we suppose three methods which considered cost (time), accuracy and evaluate for each. 'Method' 1 is to calculate the vertical pupil diameter from images, 'method 2' is to calculate the pupil size from whole image (method 2-1; by binarization and method 2-2; by binarization with shape evaluation) and 'method 3', the most accurate method, is from three-dimensional transformation of pupil image. As a result, for seven subjects, each method is takes about 6, 44, 124, 311 minutes to evaluate five-minute images (300,000 pixels/frame, 30 frames/sec). Also, the result of correlation between the parameter Lf/Hf ratio of heart rate variability, commonly used method for estimate the state of autonomic nerve system, and it of pupil size variability is, for each case, 0.34, 0.2, 0.69, 0.69.
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Affiliation(s)
- J C Lee
- Dept. of Biomed. Eng., Kyunghee Univ., Kyunggi, South Korea
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39
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Janelsins MC, Mastrangelo MA, Park KM, Fowlkes KL, Kinsky M, Narrow WC, Oddo S, LaFerla FM, Federoff HJ, Bowers WJ. 248. Revealing the Role(s) of TNF-alpha in Early Alzheimer's Disease Via rAAV-Mediated Hippocampal Gene Transfer in a Triple Transgenic Mouse Model. Mol Ther 2006. [DOI: 10.1016/j.ymthe.2006.08.275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Hwang S, Lee SG, Park KM, Kim KH, Ha TY. Refined Suture Techniques to Prevent Bleeding From Accidental Slippage of Vascular Clamps During Living Donor Hepatectomy. Transplant Proc 2005; 37:4347-9. [PMID: 16387117 DOI: 10.1016/j.transproceed.2005.11.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 11/17/2022]
Abstract
Accidental slippage of vascular clamps during living donor hepatectomy can induce brisk bleeding and even imperil the donor. After practicing more than 1000 cases of living donor hepatectomy, the investigators realized that specialized suture techniques were important to secure the vascular closure to prevent unnecessary bleeding. For secure division of intrahepatic vein branches, we devised a continuous penetration suture method in which the orders of procedures were changed to clamping-closure-cut sequence. For secure division of the main and accessory hepatic vein branches from the inferior vena cava, we applied stay sutures at each corner and midpoint of the hepatic vein stump so as not to permit its slippage. After application of these methods, we did not experience any episode of accidental clamp slippage. We are sure that these suture techniques are beneficial to prevent unnecessary bleeding during living donor hepatectomy and to make surgeons feel at ease during the living donor operation.
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Affiliation(s)
- S Hwang
- Department of Surgery, Asan Medical Center, Seoul, Republic of Korea
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Abstract
We report a case of split liver transplantation (SLT) for two adult recipients, which was the first successful case in Korea. The brain-dead donor was a 22-year-old man weighing 65 kg, but his liver volume was estimated as 2120 mL on computed tomographic volumetry. As it seemed to be too large for a 60-kg recipient candidate, SLT was planned after assessment of lobar liver volume and middle hepatic vein anatomy. The right lobe was mobilized first and the liver parenchyma transected along the right border of the middle hepatic vein. The 1240-g right lobe (segments 5 to 8) graft was implanted into a 57-year-old male patient with acute-on-chronic liver failure in the same manner as a living-donor graft. After that, routine procedures of cadaveric multiorgan procurement were performed. The 670-g left lobe (segments 1 to 4) with a retrohepatic vena cava, common bile duct, and aortic patch was implanted into another 37-year-old male recipient. These two recipients recovered uneventfully surviving 12 months to date. We integrated the surgical techniques learned from hundreds of adult-to-adult living donor liver transplants into this first trial of two adult SLT.
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Affiliation(s)
- S Hwang
- Division of Hepatopancreatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, Ulsan University College of Medicine, Seoul 138-736, Korea
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Hwang S, Lee SG, Kim KH, Park KM, Lee YJ, Ahn CS, Moon DB, Ha TY, Cho SH, Oh KB. Intraoperative assessment of hepatic venous congestion with direct clamping of the hepatic vein trunk for living donor liver transplantation. Transplant Proc 2004; 36:1462-5. [PMID: 15251358 DOI: 10.1016/j.transproceed.2004.05.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 11/15/2022]
Abstract
We devised a hepatic vein clamping method to assess the amount of hepatic venous congestion (HVC) before liver transection. From February 2003 to May 2003, this method was applied to 5 of 58 living donor livers especially to assess donor safety. The left portal vein and proper hepatic artery as well as the middle hepatic vein (MHV)-left hepatic vein (LHV) trunk were clamped simultaneously to assess the HVC in the remnant right lobe before performing extended left lobectomy. As three donors demonstrated the extent of the HVC equivalent to about 40% of the right lobe volume (RLV), their operations proceeded according to the preoperative plan. The territory of HVC after liver transection was the same as that observed with direct clamping of the hepatic vein. However, one donor showed massive HVC more than 50% of RLV and the operative plan was adjusted to harvest only the left lobe without the MHV trunk for donor safety. To assess the HVC in the remnant left lobe, the isolated LHV trunk was occluded after clamping the donor's proper hepatic artery. The whole left lobe except for a small area at the anterior portion of the medial segment became discolored on LHV clamping: the opposite demarcation appeared on MHV clamping. The amount of HVC was so small that we harvested the right lobe with the MHV trunk. All donors and recipients recovered uneventfully. We believe that this direct clamping method makes the assessment of HVC feasible before parenchymal transection of a donor liver.
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Affiliation(s)
- S Hwang
- Division of Hepatopancreatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, Ulsan University College of Medicine, Seoul, South Korea
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Shin HT, Park KM, Kang KH, Oh DJ, Lee SW, Baig SY, Lee JH. Novel method for cell immobilization and its application for production of oligosaccharides from sucrose. Lett Appl Microbiol 2004; 38:176-9. [PMID: 14746552 DOI: 10.1111/j.1472-765x.2003.01480.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 11/30/2022]
Abstract
AIMS The purpose of the present investigation was to develop a novel method for cell immobilization. METHODS AND RESULTS Aureobasidium pullulans cells were mixed with an alginate solution, and the mixture was extruded to form small gel beads as hydrated-immobilized cells. The beads were then placed at -15 degrees C for 6-24 h to induce freeze-dehydration. The freeze-dehydration resulted in shrinkage of beads as a result of water removal reducing bead volume by 82% and bead weight by 85%. The dehydrated beads were successfully used for the production of fructo-oligosaccharides in a model reactor system. CONCLUSIONS Dehydrated beads may provide some commercial advantages over conventional immobilized cells. SIGNIFICANCE AND IMPACT OF THE STUDY This study shows that bioreactor performance can be improved up to two times by the use of the dehydrated beads.
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Affiliation(s)
- H T Shin
- Faculty of Life Science and Technology, Sungkyunkwan University, Suwon, Kyunggi-do, Korea
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Moon DB, Lee SG, Hwang S, Park KM, Kim KH, Ahn CS, Chu CW, Lee YJ, Na YW, Ha TY, Cho SH, Oh KB. Massive subcapsular hematoma of liver graft after living donor liver transplantation: a case report. Transplant Proc 2003; 35:1469-72. [PMID: 12826195 DOI: 10.1016/s0041-1345(03)00471-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- D B Moon
- Department of Surgery, Division of Hepato-Biliary Surgery and Liver Transplantation, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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Park KM, You JS, Lee HY, Baek NI, Hwang JK. Kuwanon G: an antibacterial agent from the root bark of Morus alba against oral pathogens. J Ethnopharmacol 2003; 84:181-185. [PMID: 12648813 DOI: 10.1016/s0378-8741(02)00318-5] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Kuwanon G was isolated from the ethyl acetate fraction of methanol extract of Morus alba and its structure was elucidated by 13C-NMR, 1H-NMR and FAB-MS. Antibacterial activity of kuwanon G was investigated by the minimum inhibitory concentration (MIC) test and the viable cell count method. MIC of kuwanon G against Streptococcus mutans causing dental caries was determined to be 8.0 microg/ml. The bactericidal test showed that kuwanon G completely inactivated S. mutans at the concentration 20 microg/ml in 1 min. Kuwanon G also significantly inhibited the growth of other cariogenic bacteria such as Streptococcus sobrinus and Streptococcus sanguis, and Porpyromonas gingivalis causing periodontitis. Transmission electron microscopy (TEM) of kuwanon G treated cells demonstrated remarkable morphological damage of the cell wall and condensation of the cytoplasm.
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Affiliation(s)
- K M Park
- Department of Biotechnology and Bioproducts Research Center, Yonsei University, Seoul 120-749, South Korea
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Hwang S, Lee SG, Kim KH, Park KM, Ahn CS, Moon DB, Chu CW, Lee YJ, Min PC. Correlation of blood-free graft weight and volumetric graft volume by an analysis of blood content in living donor liver grafts. Transplant Proc 2002; 34:3293-4. [PMID: 12493450 DOI: 10.1016/s0041-1345(02)03603-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- S Hwang
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of General Surgery, Asan Medical Center, Ulsan University, Seoul, South Korea
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Lee SG, Park KM, Hwang S, Lee YJ, Kim KH, Ahn CS, Choi DL, Joo SH, Jeon JY, Chu CW, Moon DB, Min PC, Koh KS, Han SH, Park SH, Choi GT, Hwang KS, Lee EJ, Chung YH, Lee YS, Lee HJ, Kim MH, Lee SK, Suh DJ, Kim JJ, Sung KB. Adult-to-adult living donor liver transplantation at the Asan Medical Center, Korea. Asian J Surg 2002; 25:277-84. [PMID: 12470999 DOI: 10.1016/s1015-9584(09)60192-5] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.8] [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] Open
Abstract
Between February 1997 and December 2001, 311 adult-to-adult living donor liver transplants (A-A LDLTs) were performed at the Asan Medical Center for patients above 20 years of age. Indications for A-A LDLT were: chronic hepatitis B (203), chronic hepatitis C (5), hepatocellular carcinoma (64), alcoholic cirrhosis (9), cryptogenic cirrhosis (4), secondary biliary cirrhosis (5), primary biliary cirrhosis (1), Wilson' s disease (2), autoimmune hepatitis (1), hepatic tuberculosis (1), cholangiocarcinoma (1), fulminant hepatic failure (14) and primary non-function of cadaveric liver graft (1). Of 311 A-A LDLTs, 36 were of medical high urgency, 20 were for acute and subacute hepatic failure, 15 were for hepato-renal syndrome and 1 was for primary non-function. Recipient age ranged from 27 to 64 years. Donor age ranged from 16 to 62 years. There was no donor mortality. Implanted liver grafts were categorized into seven types: 175 modified right lobe (MRL), 70 left lobe, 32 right lobe, 20 dual grafts, 10 left lobe plus caudate lobe, three extended right lobe and one posterior segment. In MRL, the tributaries of the middle hepatic vein were reconstructed by interpositioning a vein graft. Indication for dual graft implantation was the same as single graft A-A LDLT, and four of 20 were emergency cases. Of 20 dual grafts, 14 received two left lobes, four received a left lobe and a lateral segment, one received a right lobe and a left lobe and one received a lateral segment and a posterior segment. Graft volume ranged from 28% to 83% of the standard liver volume of the recipients. There were 33 (10.6%) in-hospital mortalities (< 4 months) among the 310 patients after 311 A-A LDLTs. Of the 36 patients receiving emergency transplants, 31 survived. These encouraging results justify the expansion of A-A LDLT in coping with increasing demands, even in urgent situations. We have aimed to introduce the establishment of the efficacy of A-A LDLT in various end-stage chronic and acute liver diseases, as well as new technical advances to overcome small graft-size syndrome by using dual-graft implantation and MRL, both of which were first developed in our department.
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Affiliation(s)
- S G Lee
- Department of General Surgery, Asan Medical Center, Ulsan University Medical School, Seoul, Korea.
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Kang Y, Lee SS, Park KM, Lee SH, Kang SO, Ko J. Self-assembly of one-dimensional coordination polymers from AgX (X = CF(3)SO(3)(-), ClO(4)(-), and NO(3)(-)) and 2-aminomethylpyridinedipropionitrile (2-AMPDPN). Inorg Chem 2001; 40:7027-31. [PMID: 11754286 DOI: 10.1021/ic0105765] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three novel supramolecules whose topologies depend on the counteranion, [Ag(2-AMPDPN)X] (X = CF(3)SO(3)(-) (1), ClO(4)(-) (2), and NO(3)(-) (3)), have been prepared by the self-assembly of AgX (X = CF(3)SO(3)(-), ClO(4)(-), and NO(3)(-)) with 2-aminomethylpyridinedipropionitrile (2-AMPDPN). The crystal structures reveal different packing arrangements of the one-dimensional infinite coordination polymers. Compound 1 is made up of ladder chains that are interlocked by cyano groups, while the polymeric chain of 2 is isomorphous to 1 except for the Ag-Ag interaction. Compound 3 consists of helical chains that are surrounded by nitrate. The adjacent helical chains are racemic. The structures of 1, 2, and 3 suggest the role that the counterions may play in the network construction.
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Affiliation(s)
- Y Kang
- Department of Chemistry, Korea University, Chochiwon, Chungnam 339-700, Korea
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Abstract
The antiplatelet and antithrombotic effects of YS-49 and YS-51--l-naphthylmethyl analogs of higenamine, which is a benzyl-tetrahydroisoquinoline alkaloid isolated from Aconitum japonicum (Ranunculaceae)--were investigated. YS-49 and YS-51 showed inhibitory activities to both human and rat platelet aggregation induced by ADP, collagen and epinephrine. They were more inhibitory to epinephrine-induced aggregation (IC(50); 3.4 and 1.7 microM of YS-49, and 6.0 and 6.3 microM of YS-51 to human and rat platelets, respectively) than ADP- or collagen-induced aggregation. The antithrombotic effects of YS-49 and YS-51 were also observed in both mouse acute thrombosis model and rat arterio-venous shunt (AV shunt) model. The oral administration of YS-49 and YS-51 (50 or 100 mg/kg) increased the recovery rates from the acute thrombotic challenge in mice and lowered the weight of thrombus formed inside the AV shunt tube in rats.
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Affiliation(s)
- H S Yun-Choi
- Natural Products Research Institute, Seoul National University, Seoul 110-460, South Korea.
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Affiliation(s)
- I Yoon
- Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Chinju 660-701, S. Korea
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