1
|
Cho JH, Shin SY. Effects of smoking cessation on the risk of cardiovascular disease: a nationwide population-based study. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2384] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Cardiovascular disease (CVD) is the global leading cause of death, and the economic and social burden of CVD is still increasing, Smoking is one of the top three leading risk factors for the disease and one of the well-established and important modifiable risk factors for CVD. However, the time course of CVD risk after smoking cessation is unclear.
Purpose
We assess the association between smoking and CVD and the incidence of CVD with years quitting smoking.
Methods
This study used the Korean National Health Insurance Service (NHIS) database. Self-reported smoking habit data were used to classify participants as current, former or never smokers and to investigate the duration and intensity of smoking. Smoking records of participants were updated every 2 years, and all participants whose smoking records were changed or unclear were excluded. The primary outcome was the development of CVD, including myocardial infarction, stroke, heart failure, and cardiovascular death.
Results
Total 5,391,231 participants (953,756 subjects were current smokers, 104,604 subjects were former smokers, 4,432,871 subjects never smoker) were followed-up for an average of 4.2 years. The mean age was 45.8 years, 39.9% were male. Cumulative pack-year (PY) were 14 in current smoker, 10.5 in former smokers at baseline. The median years of quitting smoking for former smoker was 4.
Regardless of whether smoking continues or not, a dose-dependent relationship exists between smoking and CVD (Fig. 1). For those smoked less than 8PY, smoking cessation significantly lowered the CVD risk within 10 years compared to current smokers, and the CVD risk was not significantly different from never smokers (Fig. 2A). However, in the case of smokers over 8PY, although smoking cessation affects the reduction of CVD, the CVD risk decreases slowly over decades, and it takes more than 20 years for the effect of smoking on the CVD risk to disappear (Fig. 2B).
Conclusion
Smoking and CVD have a dose-dependent relationship, and mild smokers with less than 8PY had a similar CVD risk to never smokers when quitting smoking. However, for heavy smokers over 8PY, it takes a long time for the CVD risk from smoking to disappear
Funding Acknowledgement
Type of funding sources: None.
Collapse
Affiliation(s)
- J H Cho
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - S Y Shin
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| |
Collapse
|
2
|
Shin SY, Jung M, Byeon K, Kang K. Intracardiac echocardiographically guided permanent pacemaker implantation is a feasible imaging tool with comparable procedural efficacy and safety. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.492] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Background
Amongst cardiovascular interventions, pacemaker implantation procedure is one of the most hazardous in terms of radiation exposure due to its proximity and unprotected radiation exposure. In order to reduce radiation hazards, alternative imaging tool to guide pacemaker implantation should be sought. The aim of this study is to investigate the feasibility, efficacy, and safety of intracardiac echocardiographically (ICE) guided pacemaker implantation.
Methods
We retrospectively investigated pacemaker implantation with ICE guidance. ICE catheter was placed in right atrium (RA). Right ventricular (RV) lead was placed in RV apex within home view (low RA, 2-4 O'clock). Then RA lead was placed in RA appendage within mid RA 1-2 O'clock view. Fluoroscopy was used only for verifying lead redundancy (2 or 3 second duration before pocket closure). Other procedure steps were similarly performed as in conventional fluoroscopic method. Radiation dosage, patient safety, total procedure time, and lead parameters were assessed and compared.
Results
From June 2013 to March 2021, a total of 270 patients underwent pacemaker implantation either with ICE or with fluoroscopy. Amongst them, ICE guided implantation was attempted in 35 patients. In order to exclude potential bias caused by the operator's learning curve, we excluded early 5 cases out of ICE group. Radiation exposure was markedly decreased within ICE group (2.3±4.4 Gy cm2 in ICE group vs. 27.2±50.5 Gy cm2 in fluoroscopy group, P<0.001). The total procedure time and complication rate showed no significant difference between groups. In ICE group, atrial lead parameters were better than those of fluoroscopy group (impedance 454±57 Ω vs. 533±125 Ω, P<0.001).
Conclusion
In 30 patients with ICE guided pacemaker implantation, radiation exposure was markedly decreased without any trade-offs in terms of patients' safety and procedural success. Furthermore, operation team members' physical stress reduction also might be potentially guaranteed.
Funding Acknowledgement
Type of funding sources: None.
Collapse
Affiliation(s)
- S Y Shin
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - M Jung
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - K Byeon
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - K Kang
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| |
Collapse
|
3
|
Shin SY, Jung M, Kang K, Byeon K. Net clinical benefit of NOAC in Korean atrial fibrillation patients with low to intermediate stroke risk. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2284] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
The balance of stroke risk reduction and potential hemorrhagic risk associated with anti-thrombotic treatment (ATT) remain unclear in Korean atrial fibrillation (AF) patients with low to intermediate stroke risk, defined as non-gender CHA2DS2-VASc score 0–1.
Purpose
The net clinical benefit (NCB) analysis of ATT may be helpful to guide stroke prevention strategy in AF patients with non-gender CHA2DS2-VASc score 0–1.
Methods
This Korean multi-center cohort study retrospectively evaluated the clinical outcomes with single antiplatelet (SAPT), vitamin K antagonist (VKA), and non-vitamin K antagonist oral anticoagulant (NOAC) in non-gender CHA2DS2-VASc score 0–1 and further stratified by biomarker-based ABCD score (Age [≥60 years], B-type natriuretic peptide [BNP] or N-terminal pro-BNP [≥300 pg/ml], Creatinine clearance [<50 ml/min/1.73 m2], and Dimension of the left atrium [≥45 mm]). The primary outcome was the NCB of ATT including thromboembolic and major bleeding events.
Results
We included 2465 patients (56.2±9.5 years; female, 665 [27.0%]) followed-up for 4.0±2.8 years, of whom 661 (26.8%) were treated with SAPT; 423 (17.2%) with VKA; and 1040 (42.2%) with NOAC. In comparison with no treatment, only NOAC demonstrated a positive tendency for stroke prevention (NOAC, NCB 0.47, 95% confidence interval [CI] −0.40 to 2.10; SAPT, NCB −0.31, 95% CI −1.48 to 1.40; and VKA, NCB −1.26, 95% CI −2.97 to 0.67). With detailed risk stratification with ABCD score, NOAC showed a significant NCB for stroke prevention compared with SAPT and VKA (SAPT vs. NOAC, NCB 1.6, 95% CI 0.26–3.50; VKA vs. NOAC, NCB 1.96, 95% CI 0.47–4.16) in patients with ABCD score ≥1. ATT failed to show NCB in patients with truly low stroke risk defined as ABCD score=0.
Conclusion
Korean AF cohort with low to intermediate stroke risk indicates that, in comparison with no ATT, only ATT with NOAC showed marginal NCB. With further risk stratification by ABCD score, NOAC showed significant advantages over other ATTs (VKA or SAPT) in patients with ABCD ≥1.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Korean Disease Control and Prevention Agency
Collapse
Affiliation(s)
- S Y Shin
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - M Jung
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - K Kang
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - K Byeon
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| |
Collapse
|
4
|
Shin SY, Jung M, Byeon K, Kang K, Park Y, Hwang Y, Lee S, Jin E, Roh S, Kim J, Ahn J, Lee S, Choi E, Ahn M, Lip G. External validation of the biomarker based ABCD score in atrial fibrillation patients with a non gender CHA2DS2 VASc score 0 to 1, A Korean multicenter retrospective cohort. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.545] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Patients with low to intermediate risk atrial fibrillation (AF), defined as non-gender CHA2DS2-VASc score of 0–1, are still at risk of stroke. This study verified the usefulness of ABCD score (Age [≥60 years], B-type natriuretic peptide [BNP] or N-terminal pro-BNP [≥300 pg/ml], Creatinine clearance [<50 ml/min/1.73 m2], and Dimension of the left atrium [≥45 mm]) for stroke risk stratification in non-gender CHA2DS2-VASc score 0–1.
Methods
This multi-center cohort study retrospectively analyzed AF patients with non-gender CHA2DS2-VASc score 0–1. The primary endpoint was the incidence of stroke with or without anti-thrombotic treatment (ATT). An ABCD score was also validated.
Results
Overall, 2694 patients (56.3±9.5 years; female, 726 [26.9%]) were followed-up for 4.0±2.8 years. The overall stroke rate was 0.84/100 person-years (P-Y), stratified as follows: 0.46/100P-Y for an ABCD score 0; 1.02/100P-Y for an ABCD score≥1. The ABCD score was superior to the non-gender CHA2DS2-VASc score in stroke risk stratification (C-index=0.618, P=0.015; net reclassification improvement=0.576, P=0.040; integrated differential improvement=0.033, P=0.066). ATT was prescribed in 2353 patients (86.5%), and the stroke rate was significantly lower in patients receiving non-vitamin K antagonist oral anticoagulant (NOAC) therapy and an ABCD score≥1 than in those without ATT (0.44/100P-Y versus 1.55/100 P-Y; hazard ratio=0.26, 95% confidence interval 0.11–0.63, P=0.003).
Conclusion
The biomarker-based ABCD score demonstrated improved stroke risk stratification in AF patients with non-gender CHA2DS2-VASc score 0–1. Furthermore, NOAC with an ABCD score≥1 was associated with significantly lower stroke rate in AF patients with a non-gender CHA2DS2-VASc score 0–1.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Korean Disease Control and Prevention Agency
Collapse
Affiliation(s)
- S Y Shin
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - M Jung
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - K Byeon
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - K Kang
- Chung-Ang University Hospital , Seoul , Korea (Republic of)
| | - Y Park
- Gachon University Gil Medical Center , Incheon , Korea (Republic of)
| | - Y Hwang
- St. Vincent's Hospital , Suwon , Korea (Democratic People's Republic of)
| | - S Lee
- Kangbuk Samsung Hospital , Seoul , Korea (Republic of)
| | - E Jin
- Kyunghee University , Seoul , Korea (Republic of)
| | - S Roh
- Korea University Guro Hospital , Seoul , Korea (Democratic People's Republic of)
| | - J Kim
- Korea University Ansan Hospital, Cardiology , Ansan-Si , Korea (Republic of)
| | - J Ahn
- Pusan National University Hospital , Pusan , Korea (Republic of)
| | - S Lee
- Seoul National University Hospital , Seoul , Korea (Republic of)
| | - E Choi
- Seoul National University Hospital , Seoul , Korea (Republic of)
| | - M Ahn
- Wonju Severance Christian Hospital , Wonju , Korea (Republic of)
| | - G Lip
- University of Liverpool , Liverpool , United Kingdom
| |
Collapse
|
5
|
Bae Y, Heo J, Chung Y, Shin SY, Lee SW. Effect of total cholesterol level variabilities on cerebrovascular disease. Eur Rev Med Pharmacol Sci 2022; 26:544-557. [PMID: 35113431 DOI: 10.26355/eurrev_202201_27882] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
OBJECTIVE Hyperlipidemia is a risk factor of cerebrovascular disease (CVD). However, the relationship between CVD and cholesterol variability is less clear. This study assesses the relationship between cholesterol change and CVD risk. PATIENTS AND METHODS We reviewed 480,830 people from 20 to 99 years with 2 health check-ups from 2002 to 2015 from the Korean National Health Insurance (KNHI) database. People's baseline and follow-up cholesterol levels were classified into low (<180 mg/dL), moderate (≥180 mg/dL and <240 mg/dL), and high (≥240 mg/dL). Participants were divided into 9 groups (low-to-low, low-to-moderate, low-to-high, moderate-to-low, moderate-to-moderate, moderate-to-high, high-to-low, high-to-moderate, high-to-high). RESULTS Low to high cholesterol level is associated with hemorrhagic stroke (aHR1 = 1.59; 95% CI 1.12-2.28 and aHR2 = 1.56; 95% CI 1.07-2.25). Low to moderate/high cholesterol level is associated with ischemic stroke and occlusion/stenosis (for low to moderate, aHR1 = 1.11; 95% CI 1.04-1.17 and aHR2 = 1.14; 95% CI 1.07-1.21 for ischemic stroke and aHR1 = 1.18; 95% CI 1.07-1.29 and aHR2 = 1.20; 95% CI 1.08-1.32 for occlusion/stenosis, for low to high, aHR1 = 1.42; 95% CI 1.20-1.67 and aHR2 = 1.28; 95% CI 1.08-1.52 for ischemic stroke and aHR1 = 1.86; 95% CI 1.46-2.36 and aHR2= 1.74; 95% CI 1.36-2.23 for occlusion/stenosis). Moderate to high cholesterol level is associated with ischemic stroke and occlusion/stenosis (for ischemic stroke, aHR1 = 1.12; 95% CI 1.05-1.20 and aHR2 = 1.10; 95% CI 1.03-1.17, for occlusion/stenosis, aHR1 = 1.21; 95% CI 1.10-1.33 and aHR2 = 1.19; 95% CI 1.08-1.32). Moderate to low cholesterol level is associated with ischemic and hemorrhagic stroke and occlusion/stenosis (for ischemic, aHR1 = 1.15; 95% CI 1.09-1.21, for hemorrhagic, aHR1 = 1.14; 95% CI 1.01-1.28, for occlusion/stenosis, aHR1 = 1.14; 95% CI 1.05-1.23). High to low cholesterol level is associated with ischemic stroke and occlusion/stenosis (for ischemic stroke, aHR1 = 1.51; 95% CI 1.33-1.71 and aHR2 = 1.20; 95% CI 1.05-1.36, for occlusion/stenosis, aHR1 = 1.50; 95% CI 1.24-1.81). CONCLUSIONS Our study shows that cholesterol changes, especially larger changes, lead to an increase in CVD, which demonstrates that cholesterol variability may increase CVD.
Collapse
Affiliation(s)
- Y Bae
- Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
| | | | | | | | | |
Collapse
|
6
|
Cho I, Shin SY, Kim WD, Kim YD, Cha MJ, Jung HG, Won HY, Lee WS, Kim TH, Kim CJ, Kim SW, Choi Y. P997Improving left atrial appendage occluder size determination by using 3-dimensional printing model of the left atrial appendage. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0590] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Introduction
Given the complexity of left atrial appendage (LAA) structure, current 2D based LAA occluder (LAAO) size prediction system using transesophageal echocardiography (TEE) has limitations.
Objective
To assess the accuracy of LAAO size determination method by implantation simulation using a 3D printed model compared with a conventional method based on TEE.
Methods
We retrospectively reviewed 57 cases with percutaneous LAAO using Amplatzer Cardiac Plug and Amulet from 2014 to 2018. We excluded cases without cardiac CT (21 cases) or with peri-device leakage or inappropriate position of the device on six months follow up TEE (6 cases), or with paroxysmal atrial fibrillation (2 cases). We finally included 28 cases with anatomically and physiologically properly implanted LAAO, using the final size of the implanted devices as a standard for the size prediction accuracy. We generated 3D printing model from cardiac CT images. LAAO size was determined with device implantation simulation using 3D printing model and occluder devices (Figure C), and conventional 2D TEE measurements by two experienced cardiologists who were blinded to the size of the finally implanted device.
Results
The accuracy in size of 3D printed left atrium (LA) models, compared with CT image sources, were validated by measuring the distance between artifacts which were intentionally implanted to LA model during image processing. There was minimal bias (−0.11 mm) between 3D images and printed LA models (Figure A). As plotted in Figure B, LAAO sizing by implantation simulation with 3D printing model showed excellent agreement with actually implanted LAAO size (r=0.927; bias=0.7±2.5), while LAAO sizing by 2D TEE measurements remained poor (r=0.544; bias 2.3±6.7).
Conclusions
LAAO size determination by using 3D printing model of LAA showed excellent accuracy. A prospective study to evaluate the clinical utility of this method should be done in future.
Collapse
Affiliation(s)
- I Cho
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - S Y Shin
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - W D Kim
- Chung Ang University, College of Medicine, Department of Medicine, Seoul, Korea (Republic of)
| | - Y D Kim
- Chung Ang University, College of Engineering, Department of Mechanical Engineering, Seoul, Korea (Republic of)
| | - M J Cha
- Chung-Ang University Hospital, Department of Radiology, Seoul, Korea (Republic of)
| | - H G Jung
- Chung Ang University, College of Medicine, Department of Medicine, Seoul, Korea (Republic of)
| | - H Y Won
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - W S Lee
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - T H Kim
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - C J Kim
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - S W Kim
- Chung-Ang University Hospital, Department of Cardiology, Seoul, Korea (Republic of)
| | - Y Choi
- Chung Ang University, College of Engineering, Department of Mechanical Engineering, Seoul, Korea (Republic of)
| |
Collapse
|
7
|
Lim HE, Ahn J, Han SJ, Shim J, Kim YH, Choi EK, Oh S, Shin SY, Lip GYH. P1026Risk factors for the occurrence of stroke after atrial fibrillation ablation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0617] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Risk factors for the occurrence of embolic stroke (ES) after atrial fibrillation (AF) ablation have not been fully elucidated. Our aim was to assess incidence of ES during long-term follow-up following AF ablation and to identify predicting factors associated with post-ablation ES.
Methods
We enrolled patients who experienced ES after AF ablation and body mass index-matched controls from AF ablation registries. Epicardial adipose tissue (EAT) was assessed using multislice computed tomography prior to ablation.
Results
A total of 3,464 patients who underwent AF ablation were recruited. During a mean follow-up of 47.2 months, ES occurred in 47 patients (1.36%) with a mean CHA2DS2-VAS score of 2.15 and overall incidence of ES was 0.34 per 100 patients/year. Compared with control group (n=190), ES group had more higher prior thromboembolic event and AF recurrence rates, larger LA size, lower creatinine clearance rate (CCr), and greater total and periatrial EAT volumes although no differences in AF type, CHA2DS2-VASc score, ablation extent, and anti-thrombotics use were found. On multivariate regression analysis, a prior history of thromboembolism, CCr, and periatrial EAT volume were independently associated with ES occurrence after AF ablation.
Cox regression analysis Risk factor Univariate Multivariate HR (95% CI) p value HR (95% CI) p value Age 1.017 (0.984–1.051) 0.31 Prior thromboembolism 2.488 (1.134–5.460) 0.023 2.916 (1.178–7.219) 0.021 CHA2DS2-VASc score 1.139 (0.899–1.445) 0.282 CCr 0.984 (0.970–0.999) 0.038 0.982 (0.996–0.998) 0.029 LA diameter (mm) 1.070 (1.012–1.130) 0.017 1.072 (0.999–1.150) 0.054 EAT_total (ml) 1.020 (1.010–1.029) <0.001 1.008 (0.993–1.023) 0.297 EAT_periatrial (ml) 1.085 (1.045–1.126) <0.001 1.065 (1.005–1.128) 0.032 PVI + additional ablation 0.846 (0.460–1.557) 0.592 No anticoagulant use 0.651 (0.346–1.226) 0.184 Recurrence 2.011 (1.007–4.013) 0.048 1.240 (0.551–2.793) 0.603 CCr, creatinine clearance rate; EAT, epicardial adipose tissue; LA, left atrium; PVI, pulmonary vein isolation.
K-M curve for stroke-free survival
Conclusions
Incidence of ES after AF ablation was lower than expected rate based on CHA2DS2-VASc score even though anticoagulants use was limited. Periatrial EAT volume, a prior thromboembolism event, and CCr were independent factors in predicting ES irrespective of AF recurrence and CHA2DS2-VASc score in patients who underwent AF ablation.
Collapse
Affiliation(s)
- H E Lim
- Hallym University Sacred Heart Hospital, Cardiology, Anyang-Si, Gyeonggi-Do, Korea (Republic of)
| | - J Ahn
- Pusan National University Hospital, Cardiology, Pusan, Korea (Republic of)
| | - S J Han
- Hallym University Sacred Heart Hospital, Cardiology, Anyang-Si, Gyeonggi-Do, Korea (Republic of)
| | - J Shim
- Korea University Anam Hospital, Cardiology, Seoul, Korea (Republic of)
| | - Y H Kim
- Korea University Anam Hospital, Cardiology, Seoul, Korea (Republic of)
| | - E K Choi
- Seoul National University Hospital, Cardiology, Seoul, Korea (Republic of)
| | - S Oh
- Seoul National University Hospital, Cardiology, Seoul, Korea (Republic of)
| | - S Y Shin
- Chung-Ang University Hospital, Cardiology, Seoul, Korea (Republic of)
| | - G Y H Lip
- Liverpool Heart and Chest Hospital, Cardiovascular Science Centre, Liverpool, United Kingdom
| |
Collapse
|
8
|
Ha EJ, Baek SM, Baek JH, Shin SY, Han M, Kim CH. Efficacy and Safety of Ethanol Ablation for Branchial Cleft Cysts. AJNR Am J Neuroradiol 2017; 38:2351-2356. [PMID: 28970243 DOI: 10.3174/ajnr.a5373] [Citation(s) in RCA: 12] [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: 01/28/2017] [Accepted: 07/10/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Branchial cleft cyst is a common congenital lesion of the neck. This study evaluated the efficacy and safety of ethanol ablation as an alternative treatment to surgery for branchial cleft cyst. MATERIALS AND METHODS Between September 2006 and October 2016, ethanol ablation was performed in 22 patients who refused an operation for a second branchial cleft cyst. After the exclusion of 2 patients who were lost to follow-up, the data of 20 patients were retrospectively evaluated. All index masses were confirmed as benign before treatment. Sonography-guided aspiration of the cystic fluid was followed by injection of absolute ethanol (99%) into the lesion. The injected volume of ethanol was 50%-80% of the volume of fluid aspirated. Therapeutic outcome, including the volume reduction ratio, therapeutic success rate (volume reduction ratio of >50% and/or no palpable mass), and complications, was evaluated. RESULTS The mean index volume of the cysts was 26.4 ± 15.7 mL (range, 3.8-49.9 mL). After ablation, the mean volume of the cysts decreased to 1.2 ± 1.1 mL (range, 0.0-3.5 mL). The mean volume reduction ratio at last follow-up was 93.9% ± 7.9% (range, 75.5%-100.0%; P < .001). Therapeutic success was achieved in all nodules (20/20, 100%), and the symptomatic (P < .001) and cosmetic (P < .001) scores had improved significantly by the last follow-up. In 1 patient, intracystic hemorrhage developed during the aspiration; however, no major complications occurred in any patient. CONCLUSIONS Ethanol ablation is an effective and safe treatment for patients with branchial cleft cysts who refuse, or are ineligible for, an operation.
Collapse
Affiliation(s)
- E J Ha
- From the Departments of Radiology (E.J.H., M.H.)
| | - S M Baek
- Department of Radiology (S.M.B., S.Y.S.), Sharing and Happiness Hospital, Busan, Korea
| | - J H Baek
- Department of Radiology and Research (J.H.B.), Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
| | - S Y Shin
- Department of Radiology (S.M.B., S.Y.S.), Sharing and Happiness Hospital, Busan, Korea
| | - M Han
- From the Departments of Radiology (E.J.H., M.H.)
| | - C-H Kim
- Otolaryngology (C.-H.K.), Ajou University School of Medicine, Suwon, Korea
| |
Collapse
|
9
|
Shin SY, Pozzi A, Boyd SK, Clark AL. Integrin α1β1 protects against signs of post-traumatic osteoarthritis in the female murine knee partially via regulation of epidermal growth factor receptor signalling. Osteoarthritis Cartilage 2016; 24:1795-1806. [PMID: 27211864 DOI: 10.1016/j.joca.2016.05.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 04/06/2016] [Accepted: 05/11/2016] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate the role of integrin α1β1 in the progression of post-traumatic osteoarthritis (PTOA), and elucidate the contribution of epidermal growth factor receptor (EGFR) signalling to the mechanism by which integrin α1β1 might control PTOA. We hypothesised that integrin α1β1 plays a protective role in the course of PTOA and that the effect of PTOA (e.g., synovitis, loss of cartilage and growth of osteophytes) would be exacerbated in mice lacking integrin α1β1 at every time point post destabilisation of medial meniscus (DMM). METHODS DMM or sham surgery was performed on integrin α1-null and wild type (WT) mice and the progression of PTOA analysed at 2, 4, 8 and 12 weeks post-surgery (PS) using micro-computed tomography (microCT), histology, and immunohistochemistry. In addition, the effects of EGFR blockade were examined by treating the mice with the EGFR inhibitor erlotinib. RESULTS Integrin α1-null female, but not male, mice showed earlier cartilage degradation post DMM surgery compared to WT controls. Furthermore, erlotinib treatment resulted in significantly less cartilage damage in integrin α1-null but not WT mice. Independent of genotype, erlotinib treatment significantly mitigated the effects of PTOA on many tissues of female mice including meniscal and fabella bone volume, subchondral bone thickness and density and cartilage degradation. In contrast, reduced EGFR signalling had little effect on signs of PTOA in male mice. CONCLUSION Integrin α1β1 protects against PTOA-induced cartilage degradation in female mice partially via the reduction of EGFR signalling. Furthermore, reduction of EGFR signalling protects against the development of PTOA in female, but not male mice.
Collapse
Affiliation(s)
- S Y Shin
- Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada
| | - A Pozzi
- Department of Medicine, Vanderbilt University, Nashville, TN, USA; Department of Medicine, Veterans Affairs Hospital, Nashville, TN, USA
| | - S K Boyd
- Department of Radiology, Faculty of Medicine, University of Calgary, Calgary, AB, Canada; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - A L Clark
- Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada; Department of Surgery, Faculty of Medicine, University of Calgary, Calgary, AB, Canada.
| |
Collapse
|
10
|
Shin NR, Moon JS, Shin SY, Li L, Lee YB, Kim TJ, Han NS. Isolation and characterization of human intestinal Enterococcus avium EFEL009 converting rutin to quercetin. Lett Appl Microbiol 2015; 62:68-74. [PMID: 26505733 DOI: 10.1111/lam.12512] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 10/14/2015] [Accepted: 10/14/2015] [Indexed: 11/27/2022]
Abstract
UNLABELLED Quercetin is a flavonol believed to have beneficial effects on human health. Rutin, found in many plants, fruits and vegetables, is metabolized by human intestinal bacteria and converted to quercetin, where it is absorbed through the intestinal epithelium. This study aimed to isolate and characterize human intestinal bacteria capable of converting rutin to quercetin. A bacterium that can metabolize rutin was isolated from human faecal samples and identified by 16S rRNA gene sequencing. The whole-cell enzymatic activities on flavonoid glycoside and the conversion profiles of the isolate were also analysed. The bacterium was identified as Enterococcus avium EFEL009 and was shown to convert rutin to isoquercetin and then to quercetin under anaerobic conditions. Microscopic analysis revealed short chains of cocci with diameters of approx. 1 μm. β-Glucosidase was shown to be constitutively expressed in Ent. avium, while α-rhamnosidase was expressed following induction by rutin. Both enzymes were mainly localized to the cell surface. This study is the first report on the isolation of a quercetin-producing Ent. avium FEEL009, which could be a potential industrial starter bacterium. SIGNIFICANCE AND IMPACT OF THE STUDY Quercetin is a member of the flavonoids family reported to have better cytoprotective abilities, stronger inhibition of lipopolysaccharide-induced nitric oxide production, and better chemoprevention than rutin. This is the first report on the isolation and characterization of Enterococcus avium EFEL009 from the human intestine which is capable of converting rutin to quercetin.
Collapse
Affiliation(s)
- N R Shin
- Division of Animal, Horticultural, and Food Sciences, Brain Korea 21 Center for Bio-Resource Development, Chungbuk National University, Cheongju, Korea
| | - J S Moon
- Division of Animal, Horticultural, and Food Sciences, Brain Korea 21 Center for Bio-Resource Development, Chungbuk National University, Cheongju, Korea
| | - S-Y Shin
- Division of Animal, Horticultural, and Food Sciences, Brain Korea 21 Center for Bio-Resource Development, Chungbuk National University, Cheongju, Korea
| | - L Li
- Division of Animal, Horticultural, and Food Sciences, Brain Korea 21 Center for Bio-Resource Development, Chungbuk National University, Cheongju, Korea
| | - Y B Lee
- Central Research Institute, Dr. Chung's Food Co. Ltd., Cheongju, Korea
| | - T-J Kim
- Division of Animal, Horticultural, and Food Sciences, Brain Korea 21 Center for Bio-Resource Development, Chungbuk National University, Cheongju, Korea
| | - N S Han
- Division of Animal, Horticultural, and Food Sciences, Brain Korea 21 Center for Bio-Resource Development, Chungbuk National University, Cheongju, Korea
| |
Collapse
|
11
|
Kong C, Shin SY, Park CS, Kim BG. Effects of Feeding Barley Naturally Contaminated with Fusarium Mycotoxins on Growth Performance, Nutrient Digestibility, and Blood Chemistry of Gilts and Growth Recoveries by Feeding a Non-contaminated Diet. Asian-Australas J Anim Sci 2015; 28:662-70. [PMID: 25715687 PMCID: PMC4412996 DOI: 10.5713/ajas.14.0707] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 10/08/2014] [Accepted: 12/03/2014] [Indexed: 11/27/2022]
Abstract
The objectives of this study were to investigate the effects of feeding barley naturally contaminated with Fusarium mycotoxins on growth performance, vulva swelling, and digestibility of dry matter, organic matter, and crude protein of gilts and the recovery of gilts fed normal diets immediately after the exposure to contaminated diets by measuring growth performance and vulva swelling. In Exp. 1, four diets were prepared to contain 0%, 15%, 30%, or 45% contaminated barley containing 25.7 mg/kg deoxynivalenol and 26.0 μg/kg zearalenone. Sixteen gilts with an initial body weight (BW) of 33.3 kg (standard deviation = 3.0) were individually housed in a metabolism crate and assigned to 4 diets with 4 replicates in a randomized complete block design based on BW. During the 14-d feeding trial, individual BW and feed consumption were measured weekly and the vertical and horizontal lengths of vulva were measured every 3 d. From d 10, feces were collected by the maker-to-marker method for 4 d. Blood samples were collected on d 14. During the overall period, the average daily gain, average daily feed intake, and gain:feed of pigs linearly decreased (p<0.01) as the dietary concentration of contaminated barley increased. However, the digestibility of crude protein was linearly increased (p = 0.011) with the increasing amounts of contaminated barley. Increasing dietary Fusarium mycotoxin concentrations did not influence vulva size, blood characteristic as well as immunoglobulin level of pigs. In the Exp. 2, a corn-soybean meal-based diet was formulated as a recovery diet. Pigs were fed the recovery diet immediately after completion of the Exp. 1. During the 14-d of recovery period, the individual BW and feed consumption were measured weekly and the vertical and horizontal length of vulva were measured every 3 d from d 0. On d 7, the feed intake of pigs previously fed contaminated diets already reached that of pigs fed a diet with 0% contaminated barley and no significant difference in growth performance among treatments was observed during d 7 to 14 of the recovery period. In conclusion, increasing levels of mycotoxins in diets linearly decreased the growth performance of pigs, and these damages can be recovered in 7 d after the diet was replaced with a normal diet. The vulva size, blood characteristic, immune responses were not affected by increasing level of contaminated barley in the diets fed to pigs.
Collapse
Affiliation(s)
- C Kong
- Department of Animal Science and Technology, Konkuk University, Seoul 143-701, Korea
| | - S Y Shin
- Department of Animal Science and Technology, Konkuk University, Seoul 143-701, Korea
| | - C S Park
- Department of Animal Science and Technology, Konkuk University, Seoul 143-701, Korea
| | - B G Kim
- Department of Animal Science and Technology, Konkuk University, Seoul 143-701, Korea
| |
Collapse
|
12
|
Li L, Shin SY, Lee KW, Han NS. Production of natural antimicrobial compound D-phenyllactic acid using Leuconostoc mesenteroides ATCC 8293 whole cells involving highly active D-lactate dehydrogenase. Lett Appl Microbiol 2014; 59:404-11. [PMID: 24888766 DOI: 10.1111/lam.12293] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [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: 03/17/2014] [Revised: 05/19/2014] [Accepted: 05/28/2014] [Indexed: 11/28/2022]
Abstract
Phenyllactic acid (PLA) is an antimicrobial compound naturally synthesized in various fermented foods and its D-form of PLA is known to be more active than the L-isomer. In this study, Leuconostoc mesenteroides ATCC 8293 cells, elaborating D-lactate dehydrogenase (D-ldh) were used to produce D-PLA from phenylpyruvic acid (PPA). When cultured in the presence of PPA (≤50 mmol l(-1)), growing cells produced a maximum yield of 35 mmol l(-1) of D-PLA, and the yields were between 75·2 and 83·3%. Higher conversion yields were obtained at pH 6·0-7·0 when growing cells were used, while the optimum pH range was broader for resting cells. The time required for the complete conversion of PPA into PLA could be shortened to 3 h using resting cells. D-ldh, an enzyme encoded by the LEUM_1756 gene of Leuc. mesenteroides ATCC 8293, was found to be responsible for the conversion of PPA into PLA. The Km and kcat values of the enzyme for PPA were found to be 15·4 mmol l(-1) and 5645 s(-1), respectively. The conditions required for the efficient production of D-PLA were optimized for both growing and resting cells of Leuc. mesenteroides, with special emphasis on achieving high stereoselectivity and conversion yield. Significance and impact of the study: This is the first study on the production of D-phenyllactic acid, which is a natural antimicrobial compound, from phenylpyruvate using Leuconostoc mesenteroides cells. The strain, ATCC 8293, that was used in the study, possesses high stereoselectivity and delivers a high yield. Therefore, it might be a promising candidate for use in large-scale production facilities and in fermented foods.
Collapse
Affiliation(s)
- L Li
- Brain Korea 21 Center for Bio-Resource Development, Division of Animal, Horticultural, and Food Sciences, Chungbuk National University, Cheongju, Korea
| | | | | | | |
Collapse
|
13
|
Shin SY, Kaburaki Y, Watanabe M, Munekata E. Synthesis of the Five Peptide Derivatives Needed to Build the Sequence Corresponding to 1–30 of Human Epidermal Growth Factor (h-EGF). Biosci Biotechnol Biochem 2014; 56:399-403. [PMID: 1368323 DOI: 10.1271/bbb.56.399] [Citation(s) in RCA: 2] [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: 11/08/2022]
Affiliation(s)
- S Y Shin
- Institute of Applied Biochemistry, University of Tsukuba, Japan
| | | | | | | |
Collapse
|
14
|
Shin SY, Kaburaki Y, Watanabe M, Munekata E. Total Solution Synthesis of Human Epidermal Growth Factor (h-EGF) by the Assembly of Nine Building Blocks. Biosci Biotechnol Biochem 2014; 56:404-8. [PMID: 1368324 DOI: 10.1271/bbb.56.404] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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: 11/08/2022]
Abstract
Human epidermal growth factor (h-EGF) composed of 53 amino acids bearing three intramolecular disulfide bridges was synthesized by the maximum protecting solution method. The synthetic h-EGF coincided with recombinant h-EGF by reverse-phase HPLC, and the sites of three intramolecular disulfide bridges were ascertained by a thermolytic digestion. The synthetic h-EGF possessed m/z 6215.7 in its FAB-MS as expected, and exhibited compatible mitogenic activity.
Collapse
Affiliation(s)
- S Y Shin
- Institute of Applied Biochemistry, University of Tsukuba, Japan
| | | | | | | |
Collapse
|
15
|
Shin SY, Kaburaki Y, Watanabe M, Munekata E. Synthesis of Four Peptide Derivatives to Build the Sequence Corresponding to 31–53 of Human Epidermal Growth Factor (h-EGF). Biosci Biotechnol Biochem 2014; 56:108-12. [PMID: 1368123 DOI: 10.1271/bbb.56.108] [Citation(s) in RCA: 2] [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: 11/08/2022]
Affiliation(s)
- S Y Shin
- Institute of Applied Biochemistry, University of Tsukuba, Japan
| | | | | | | |
Collapse
|
16
|
Parekh R, Lorenzo MK, Shin SY, Pozzi A, Clark AL. Integrin α1β1 differentially regulates cytokine-mediated responses in chondrocytes. Osteoarthritis Cartilage 2014; 22:499-508. [PMID: 24418674 PMCID: PMC4028170 DOI: 10.1016/j.joca.2013.12.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 12/07/2013] [Accepted: 12/25/2013] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To elucidate the role of integrin α1β1 in chondrocyte responses to inflammatory interleukin-1α (IL-1) and anabolic transforming growth factor-β1 (TGF-β1) in the knee. METHODS Intracellular calcium transient responses to IL-1 and TGF-β1 were measured in wild type and integrin α1-null chondrocytes using real time ex vivo confocal microscopy, and immunohistochemistry was performed to analyze TGF-β1-mediated activation of Smad2/3 in tibial and femoral chondrocytes. RESULTS Loss of integrin α1β1 reduces intracellular calcium transient response to IL-1, while it enhances chondrocyte responses to TGF-β1 as measured by intracellular calcium transients and activation of downstream Smad2/3. CONCLUSIONS Integrin α1β1 plays a vital role in mediating chondrocyte responses to two contrasting factors that are critical players in the onset and progression of osteoarthritis - inflammatory IL-1 and anabolic TGF-β. Further investigation into the molecular mechanisms by which integrin α1β1 mediates these responses will be an important next step in understanding the influence of increased expression of integrin α1β1 during the early stages of osteoarthritis on disease progression.
Collapse
Affiliation(s)
- R Parekh
- Faculty of Science, The University of Calgary, Calgary, AB, Canada
| | - MK Lorenzo
- Faculty of Science, The University of Calgary, Calgary, AB, Canada
| | - SY Shin
- Faculty of Kinesiology, The University of Calgary, Calgary, AB, Canada
| | - A Pozzi
- Department of Medicine, Vanderbilt University, Nashville, TN, USA,Department of Medicine, Veterans Affairs Hospital, Nashville, TN, USA
| | - AL Clark
- Faculty of Kinesiology, The University of Calgary, Calgary, AB, Canada,Department of Surgery, Faculty of Medicine, The University of Calgary, Calgary, AB, Canada
| |
Collapse
|
17
|
Abstract
BACKGROUND IL22RA1 (Interleukin 22 receptor-alpha 1), a member of the class II cytokine receptor family, mediates diverse biologic activities and appears to be important in pathogen defense, wound healing, and tissue reorganization. Polymorphisms in genes encoding inflammatory cytokines are associated with increased cancer risk. AIM The aim of this study was to evaluate the association between the single nucleotide polymorphisms (SNP) in the IL22 and IL22RA1 and papillary thyroid cancer (PTC), and to assess the relationship between the SNP in the IL22 and IL22RA1 and the clinical parameters of PTC. MATERIAL AND METHODS Study enrolled experimental group of 94 PTC patients and 213 controls. PTC patients were grouped and compared for clinical PTC parameters. One promoter SNP of IL22, -429C/T (rs2227485), and one SNP of IL22RA1, Arg518Gly (rs3795299) were analyzed using direct sequencing. Genetic data were analyzed using Helixtree, SNPAnalyzer Pro, SNPStats, and Haploview. RESULTS A SNP in IL22 (rs2227485) was significantly associated with PTC (codominant2 model [C/C vs T/T], odds ratio (OR) 2.39, 95% confidence interval (CI) 1.21-4.71, p=0.012; dominant model, OR 1.89, 95% CI 1.08-3.31, p=0.022). The allele T frequency of rs2227485 in IL22 was also associated with PTC (OR 1.59, 95% CI 1.13-2.25, p=0.009). According to clinical parameters, rs2227485 of IL22 was associated with number of cancers (dominant model, OR 3.03, 95% CI 1.02-9.01, p=0.035). By haplotype analysis, TG was associated with PTC (codominant model, OR 1.52, 95% CI 1.07-2.16, p=0.019; dominant model, OR 1.91, 95% CI 1.13- 3.24, p=0.015). Genotype and allele analysis of rs3795299 in IL22RA1 showed no significant differences between PTC patients and controls. CONCLUSION The rs2227485 SNP in IL22 might be associated with the risk and the multifocality of PTC.
Collapse
Affiliation(s)
- Y G Eun
- Department of Otolaryngology-Head and Neck Surgery, Kandong Sacred Heart Hospital, Hallym University School of Medicine, 445 Gil-Dong, Kangdong-Gu, Seoul 134-701, South Korea
| | | | | | | | | | | | | |
Collapse
|
18
|
Amin N, Byrne E, Johnson J, Chenevix-Trench G, Walter S, Nolte IM, Vink JM, Rawal R, Mangino M, Teumer A, Keers JC, Verwoert G, Baumeister S, Biffar R, Petersmann A, Dahmen N, Doering A, Isaacs A, Broer L, Wray NR, Montgomery GW, Levy D, Psaty BM, Gudnason V, Chakravarti A, Sulem P, Gudbjartsson DF, Kiemeney LA, Thorsteinsdottir U, Stefansson K, van Rooij FJA, Aulchenko YS, Hottenga JJ, Rivadeneira FR, Hofman A, Uitterlinden AG, Hammond CJ, Shin SY, Ikram A, Witteman JCM, Janssens ACJW, Snieder H, Tiemeier H, Wolfenbuttel BHR, Oostra BA, Heath AC, Wichmann E, Spector TD, Grabe HJ, Boomsma DI, Martin NG, van Duijn CM. Genome-wide association analysis of coffee drinking suggests association with CYP1A1/CYP1A2 and NRCAM. Mol Psychiatry 2012; 17:1116-29. [PMID: 21876539 PMCID: PMC3482684 DOI: 10.1038/mp.2011.101] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Coffee consumption is a model for addictive behavior. We performed a meta-analysis of genome-wide association studies (GWASs) on coffee intake from 8 Caucasian cohorts (N=18 176) and sought replication of our top findings in a further 7929 individuals. We also performed a gene expression analysis treating different cell lines with caffeine. Genome-wide significant association was observed for two single-nucleotide polymorphisms (SNPs) in the 15q24 region. The two SNPs rs2470893 and rs2472297 (P-values=1.6 × 10(-11) and 2.7 × 10(-11)), which were also in strong linkage disequilibrium (r(2)=0.7) with each other, lie in the 23-kb long commonly shared 5' flanking region between CYP1A1 and CYP1A2 genes. CYP1A1 was found to be downregulated in lymphoblastoid cell lines treated with caffeine. CYP1A1 is known to metabolize polycyclic aromatic hydrocarbons, which are important constituents of coffee, whereas CYP1A2 is involved in the primary metabolism of caffeine. Significant evidence of association was also detected at rs382140 (P-value=3.9 × 10(-09)) near NRCAM-a gene implicated in vulnerability to addiction, and at another independent hit rs6495122 (P-value=7.1 × 10(-09))-an SNP associated with blood pressure-in the 15q24 region near the gene ULK3, in the meta-analysis of discovery and replication cohorts. Our results from GWASs and expression analysis also strongly implicate CAB39L in coffee drinking. Pathway analysis of differentially expressed genes revealed significantly enriched ubiquitin proteasome (P-value=2.2 × 10(-05)) and Parkinson's disease pathways (P-value=3.6 × 10(-05)).
Collapse
Affiliation(s)
- N Amin
- Unit of Genetic Epidemiology, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - E Byrne
- Department of Genetics, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - J Johnson
- Department of Genetics, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - G Chenevix-Trench
- Department of Genetics, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - S Walter
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands,Department of Public Health, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - I M Nolte
- Unit of Genetic Epidemiology and Bioinformatics, Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | | | - J M Vink
- Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands
| | - R Rawal
- Institute of Epidemiology, Helmholtz Zentrum München, Neuherberg, Germany
| | - M Mangino
- Department of Twin Research and Genetic Epidemiology, St Thomas' Hospital Campus, King's College London, London, UK
| | - A Teumer
- Interfaculty Institute for Genetics and Functional Genomics, Department of Functional Genomics, University of Greifswald, Greifswald, Germany
| | - J C Keers
- LifeLines Cohort Study and Biobank, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - G Verwoert
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - S Baumeister
- Institute for Community Medicine, University of Greifswald, Greifswald, Germany
| | - R Biffar
- Department of Prosthodontics, Gerodontology and Dental Materials, Center of Oral Health, University of Greifswald, Greifswald, Germany
| | - A Petersmann
- Institute of Clinical Chemistry and Laboratory Medicine, University of Greifswald, Greifswald, Germany
| | - N Dahmen
- Department of Psychiatry, University of Mainz, Mainz, Germany
| | - A Doering
- Institute of Epidemiology, Helmholtz Zentrum München, Neuherberg, Germany
| | - A Isaacs
- Unit of Genetic Epidemiology, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - L Broer
- Unit of Genetic Epidemiology, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - N R Wray
- Department of Genetics, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - G W Montgomery
- Department of Genetics, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - D Levy
- National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, MA, USA,Center for Population Studies, NHLBI, Bethesda, MD, USA
| | - B M Psaty
- Cardiovascular Health Research Unit, Departments of Medicine, Epidemiology, and Health Services, University of Washington, Seattle, WA, USA,Group Health Research Institute, Group Health Cooperative, Seattle, WA, USA
| | - V Gudnason
- Icelandic Heart Association, Kopavogur, Iceland,University of Iceland, Reykjavik, Iceland
| | - A Chakravarti
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, USA,Department of Epidemiology and Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - P Sulem
- deCODE Genetics, Reykjavik, Iceland
| | | | - L A Kiemeney
- Department of Urology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands,Department of Endocrinology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands,Comprehensive Cancer Center East, BG Nijmegen, The Netherlands
| | - U Thorsteinsdottir
- deCODE Genetics, Reykjavik, Iceland,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - K Stefansson
- deCODE Genetics, Reykjavik, Iceland,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - F J A van Rooij
- Department of Public Health, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Y S Aulchenko
- Unit of Genetic Epidemiology, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - J J Hottenga
- Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands
| | - F R Rivadeneira
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A Hofman
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A G Uitterlinden
- Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - C J Hammond
- Human Genetics, Wellcome Trust Sanger Institute, Genome Campus, Hinxton, UK
| | - S-Y Shin
- Human Genetics, Wellcome Trust Sanger Institute, Genome Campus, Hinxton, UK
| | - A Ikram
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - J C M Witteman
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A C J W Janssens
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - H Snieder
- Unit of Genetic Epidemiology and Bioinformatics, Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,LifeLines Cohort Study and Biobank, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - H Tiemeier
- Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands,Department of Child and Adolescent Psychiatry, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - B H R Wolfenbuttel
- LifeLines Cohort Study and Biobank, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,Department of Endocrinology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - B A Oostra
- Unit of Genetic Epidemiology, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands,Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A C Heath
- Department of Psychiatry, Washington University, St Louis, MI, USA
| | - E Wichmann
- Institute of Epidemiology, Helmholtz Zentrum München, Neuherberg, Germany,Institute of Medical Informatics, Biometry and Epidemiology, Chair of Epidemiology, Ludwig-Maximilians-Universität, Munich, Germany
| | - T D Spector
- Department of Twin Research and Genetic Epidemiology, St Thomas' Hospital Campus, King's College London, London, UK
| | - H J Grabe
- Department of Psychiatry and Psychotherapy, University of Greifswald, Stralsund, Germany
| | - D I Boomsma
- Department of Biological Psychology, VU University Amsterdam, Amsterdam, The Netherlands
| | - N G Martin
- Department of Genetics, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - C M van Duijn
- Unit of Genetic Epidemiology, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands,Centre of Medical Systems Biology, Netherlands Consortium on Healthy Aging, Leiden and National Genomics Initiative, The Hague, The Netherlands,Department of Epidemiology, Erasmus Medical Center Rotterdam, Dr Molewaterplein 50, 3015 GE, Rotterdam, The Netherlands. E-mail:
| |
Collapse
|
19
|
Abstract
We report four cases of possible human infections with Delftia lacustris. D. lacustris isolates, which were isolated from blood cultures and bile fluid of patients with underlying diseases such as empyema, renal injury, hepatocellular carcinoma, and renal infarction, were identified using 16S rRNA gene sequencing and biochemical tests. Four D. lacustris isolates did not show the same antimicrobial susceptibility profiles and enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) patterns, indicating their non-clonality.
Collapse
Affiliation(s)
- S Y Shin
- Korea Medical Institute, Seoul, South Korea
| | | | | |
Collapse
|
20
|
Shin SY, Jang S, Park CJ, Chi HS, Lee JH, Lee JH, Lee KH, Suh C, Lim SE, Seo EJ. Application of an immune-magnetic cell sorting method for CD138-positive plasma cells in FISH analysis of multiple myeloma. Int J Lab Hematol 2012; 34:541-6. [PMID: 22672327 DOI: 10.1111/j.1751-553x.2012.01433.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [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
INTRODUCTION Interphase fluorescence in situ hybridization (FISH) analysis of multiple myeloma (MM) may indiscriminately count signals of nonplasma cells, thus decreasing specificity and sensitivity. We aimed to evaluate the usefulness of an immune-magnetic sorting method for plasma cells in FISH analysis of MM and define optimal sample preparation conditions. METHODS Plasma cells were purified using EasySep(®) CD138 Positive Selection Cocktail and Magnetic Nanoparticles (Invitrogen). We compared FISH results with and without plasma cell purification for three sample preparation methods: direct harvest, 24-h culture, and 96-h culture with interleukin-4 in five newly diagnosed MM patients. Archived fixed bone marrow cells of 17 MM patients were also studied. RESULTS The percentage of abnormal cells identified was significantly higher with plasma cell purification than without purification (median, 88.0%; range, 84.0-100.0%vs. 15.0%, 12.5-29.5%, respectively). The three sample preparation methods showed comparable results. Immune-magnetic sorting also significantly increased the percentage of abnormal cells identified in FISH analysis of archived fixed bone marrow cells (P < 0.001). CONCLUSIONS Immune-magnetic CD138-positive cell sorting significantly increased the percentage of abnormal cells identified in FISH analysis of MM samples for all sample preparation methods. This method could also be applied for retrospective FISH analysis of archived fixed bone marrow cells.
Collapse
Affiliation(s)
- S Y Shin
- Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Abstract
Posterior maxillary region is considered to be the most challenging area for dental implant placement. Lateral window opening is the gold standard procedure for maxillary sinus augmentation in this area. The purpose of this study is to evaluate lateral wall thickness of the maxillary sinus for sinus augmentation using computed tomography (CT) in edentulous patients. Computed tomography images of 302 patients were analysed. Using the maxillary sinus floor as the reference point in edentulous regions, lateral wall thickness was measured on CT scans. After drawing a tangent line at the lowest point of the sinus floor, another perpendicular line to the tangent line was drawn at the same point of the sinus floor. Thickness of the lateral wall of the maxillary sinus was measured using 10DR implant software at 3 (R1), 10 (R2) and 15 mm (R3) from the sinus floor. The mean thickness of the lateral wall of the maxillary sinus from the first premolar to second molar was 1·69 ± 0·71, 1·50 ± 0·72, 1·77 ± 0·78 and 1·89 ± 0·85 mm, respectively. The thickness differed significantly at the R2 and R3 points. Women had thinner lateral walls at the R1 and R2 points at the premolars than did men. At the R2 and R3 points at the second premolar, the mean thickness of smokers was larger than that of non-smokers. There were no significant differences on age or reasons for tooth loss. The changes in the thickness of the lateral wall at different reference points were observed, and CT examinations may help make lateral window without membrane perforation.
Collapse
Affiliation(s)
- S-M Yang
- Department of Periodontology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | | | | | | |
Collapse
|
22
|
Lee SK, Lee S, Shin SY, Ryu PD, Lee SY. Single cell analysis of voltage-gated potassium channels that determines neuronal types of rat hypothalamic paraventricular nucleus neurons. Neuroscience 2012; 205:49-62. [PMID: 22245500 DOI: 10.1016/j.neuroscience.2011.12.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Revised: 11/16/2011] [Accepted: 12/19/2011] [Indexed: 10/14/2022]
Abstract
The hypothalamic paraventricular nucleus (PVN), a site for the integration of both the neuroendocrine and autonomic systems, has heterogeneous cell composition. These neurons are classified into type I and type II neurons based on their electrophysiological properties. In the present study, we investigated the molecular identification of voltage-gated K+ (Kv) channels, which determines a distinctive characteristic of type I PVN neurons, by means of single-cell reverse transcription-polymerase chain reaction (RT-PCR) along with slice patch clamp recordings. In order to determine the mRNA expression profiles, firstly, the PVN neurons of male rats were classified into type I and type II neurons, and then, single-cell RT-PCR and single-cell real-time RT-PCR analysis were performed using the identical cell. The single-cell RT-PCR analysis revealed that Kv1.2, Kv1.3, Kv1.4, Kv4.1, Kv4.2, and Kv4.3 were expressed both in type I and in type II neurons, and several Kv channels were co-expressed in a single PVN neuron. However, we found that the expression densities of Kv4.2 and Kv4.3 were significantly higher in type I neurons than in type II neurons. Taken together, several Kv channels encoding A-type K+ currents are present both in type I and in type II neurons, and among those, Kv4.2 and Kv4.3 are the major Kv subunits responsible for determining the distinct electrophysiological properties. Thus these 2 Kv subunits may play important roles in determining PVN cell types and regulating PVN neuronal excitability. This study further provides key molecular mechanisms for differentiating type I and type II PVN neurons.
Collapse
Affiliation(s)
- S K Lee
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea
| | | | | | | | | |
Collapse
|
23
|
Abstract
Deferral of blood donors taking teratogenic drugs is critical. From March 2008 to January 2009, we analysed stored blood specimens from donors who had taken teratogenic drugs and whose blood was transfused to women of childbearing age to determine the plasma concentration at the time of donation using high-performance liquid chromatography. In total, 167 specimens were examined. The numbers of specimens exceeding the quantification limit were 7, 39, 4, 2 and 1 for finasteride, isotretinoin, acitretin, etretinate and dutasteride, respectively. Finasteride was beyond the recommended drug deferral period in one specimen. These results may help create practical deferral policies.
Collapse
Affiliation(s)
- S Y Shin
- Division of Human Blood Safety Surveillance, Korea Centers for Disease Control and Prevention, Osong Health Technology Administration Complex, South Korea
| | | | | | | | | |
Collapse
|
24
|
Shin SY, Jang S, Park CJ, Chi HS, Lee KH, Huh J, Seo EJ. A rare case of Lennert's type peripheral T-cell lymphoma with t(14;19)(q11.2;q13.3). Int J Lab Hematol 2011; 34:328-32. [PMID: 22122800 DOI: 10.1111/j.1751-553x.2011.01385.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: 11/29/2022]
Abstract
Although most patients with peripheral T-cell lymphoma (PTCL) show clonal rearrangement of T-cell receptor genes, few PTCLs show recurrent chromosomal abnormalities. We describe here a rare chromosomal rearrangement, t(14;19)(q11.2;q13.3), in a Lennert's lymphoma, a variant of PTCL, not otherwise specified. Sequential fluorescence in situ hybridization assays showed that the breakpoint in 19q13.3 was located distal to the BCL3 and PVRL2 genes, both of which may be candidate proto-oncogenes. These findings suggest that another gene is involved in the pathogenic characteristics observed in this patient with Lennert's lymphoma.
Collapse
Affiliation(s)
- S Y Shin
- Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, Korea
| | | | | | | | | | | | | |
Collapse
|
25
|
Abstract
A uterus-like mass is a rare, benign extra-uterine tumour composed of smooth muscle and endometrium. The majority of uterus-like masses occur in the ovary. Rarely, uterus-like masses occur in the broad ligament, small bowel, small bowel mesentery or uterine cervix. Here, we report a case of a uterus-like mass in the sigmoid mesocolon. A well-defined, markedly enhanced soft-tissue mass with central cystic change and haemorrhage was observed on CT. The current report describes the CT characteristics of this sigmoid mesocolon uterus-like mass together with the differential diagnoses.
Collapse
Affiliation(s)
- S Y Shin
- Department of Radiology, Kyung Hee University Medical Center, Dongdaemun-gu, Seoul, Korea
| | | | | | | |
Collapse
|
26
|
Choi GS, Shin SY, Kim JH, Lee HY, Palikhe NS, Ye YM, Kim SH, Park HS. Serum lactoferrin level as a serologic biomarker for allergic rhinitis. Clin Exp Allergy 2009; 40:403-10. [PMID: 20015277 DOI: 10.1111/j.1365-2222.2009.03414.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Allergic rhinitis (AR) is a very common disease and a risk factor for allergic asthma. The discovery of new biomarkers for the early detection of AR would improve the clinical outcomes and reduce socio-economic burden. We sought to identify a novel serologic marker for detection of AR using a proteomic approach. METHODS To identify the proteins involved in AR, comparative proteomics was applied using nasal lavage fluids (NLFs) taken before and after a nasal provocation test (NPT) with Dermatophagoides pteronyssinus (Dpt) in a subject with AR sensitized to Dpt. The clinical relevance of the identified proteins was evaluated by ELISA using NLFs and sera from the three study groups: Dpt-sensitive AR; asymptomatic Dpt-sensitive controls; and non-atopic healthy controls. The sensitivities and specificities of the candidate proteins for predicting AR were determined using receiver operating characteristic (ROC) curves. RESULTS In proteomic analysis, lactoferrin expression was up-regulated after NPT. The validation study using ELISA showed a significantly lower serum lactoferrin level in the AR group than those of the other two groups (P<0.05, respectively). To discriminate between subjects with or without AR, the optimal serum cut-off level of lactoferrin was set at <307 ng/mL using the ROC curve. The sensitivity and specificity for predicting AR were 81.4% and 58%. When combined with serum Dpt-specific IgE level, the sensitivity and specificity for predicting AR were 76.7% and 79.2%. CONCLUSION These results suggest that the serum lactoferrin level is associated with the phenotype of Dpt-sensitive AR, and in combination with the serum Dpt-specific IgE level, may be a potential serologic marker for early detection of AR.
Collapse
Affiliation(s)
- G-S Choi
- Department of Allergy and Rheumatology, Kyung Hee University College of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | |
Collapse
|
27
|
Affiliation(s)
- S Y Shin
- Endodontic Division, Atlantic Coast Dental Research Clinic, West Palm Beach, FL, USA
| | | | | |
Collapse
|
28
|
Choi GS, Park HJ, Hur GY, Choi SJ, Shin SY, Ye YM, Park HS. Vascular endothelial growth factor in allergen-induced nasal inflammation. Clin Exp Allergy 2009; 39:655-61. [DOI: 10.1111/j.1365-2222.2009.03216.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
29
|
|
30
|
Pak HN, Kim JS, Shin SY, Lee HS, Choi JI, Lim HE, Hwang C, Kim YH. Is Empirical Four Pulmonary Vein Isolation Necessary for Focally Triggered Paroxysmal Atrial Fibrillation? Comparison of Selective Pulmonary Vein Isolation Versus Empirical Four Pulmonary Vein Isolation. J Atr Fibrillation 2008; 1:99. [PMID: 28496581 PMCID: PMC4955819 DOI: 10.4022/jafib.99] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2008] [Revised: 07/11/2008] [Accepted: 07/14/2008] [Indexed: 06/07/2023]
Affiliation(s)
- H N Pak
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - J S Kim
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - S Y Shin
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - H S Lee
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - J I Choi
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - H E Lim
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - C Hwang
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| | - Y H Kim
- Andrea Corrado and Antonio Raviele "Dell'Angelo" Hospital of Mestre, Venezia, Italy
| |
Collapse
|
31
|
Takushima Y, Shin SY, Chung YC. Design of a LiNbO(3) ribbon waveguide for efficient difference-frequency generation of terahertz wave in the collinear configuration. Opt Express 2007; 15:14783-14792. [PMID: 19550758 DOI: 10.1364/oe.15.014783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We propose and investigate a ribbon waveguide for difference-frequency generation of terahertz (THz) wave from infrared light sources. The proposed ribbon waveguide is composed of a nonlinear optic crystal and has a thickness less than the wavelength of the THz wave to support the surface-wave mode in the THz region. By utilizing the waveguide dispersion of the surface-wave mode, the phase matching condition between infrared pump, idler and THz waves can be realized in the collinear configuration. Owing to the weak mode confinement of the THz wave, the absorption coefficient can also be reduced. We design the ribbon waveguide which uses LiNbO(3) crystal and discuss the phase-matching condition for DFG of THz wave. Highly efficient THz-wave generation is confirmed by numerical simulations.
Collapse
|
32
|
Karki P, Seong C, Kim JE, Hur K, Shin SY, Lee JS, Cho B, Park IS. Intracellular K(+) inhibits apoptosis by suppressing the Apaf-1 apoptosome formation and subsequent downstream pathways but not cytochrome c release. Cell Death Differ 2007; 14:2068-75. [PMID: 17885667 DOI: 10.1038/sj.cdd.4402221] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [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: 11/09/2022] Open
Abstract
Cellular ionic homeostasis, fundamentally K(+) homeostasis, has been implicated as a critical regulator of apoptosis. The intracellular K(+) efflux on apoptotic insult and suppression of apoptosis by high concentration of extracellular K(+) or after inhibition of this efflux by K(+) channel blockers have established the crucial role of K(+) in turning on the apoptotic machinery. Several contrasting observations have reported the antiapoptotic effect of intracellular K(+) concentration to be the result of inhibition of cytochrome c release from mitochondria, but the exact inhibitory mechanism remains obscure. However, here we show the blockage of K(+) efflux during apoptosis did not affect cytochrome c release from the mitochondria, still completely inhibited the formation of the apoptosome comprising Apaf-1, cytochrome c, caspase-9 and other accessories. As a consequence of this event, procaspase-9, -3, -8 and other death-related proteins were not processed. Furthermore, physiological concentrations of K(+) also inhibited the processing of procaspase-3 by purified caspase-8 or -9, the nucleosomal DNA fragmentation by purified DFF40/CAD and the nuclear fragmentation to varying extents. Altogether, these findings suggest that the efflux of K(+) is prerequisite not only for the formation of the apoptosome but also for the downstream apoptotic signal-transduction pathways.
Collapse
Affiliation(s)
- P Karki
- Department of Bio-Materials Engineering and Cellular and Molecular Medicine, School of Medicine, Research Center for Proteineous Materials (RCPM), Chosun University, Gwangju, Korea
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Affiliation(s)
- G-Y Hur
- Department of Allergy and Rheumatology, Ajou University School of Medicine, San-5, Wonchun-dong, Youngtong-gu, Suwon 443-721, Korea
| | | | | | | | | |
Collapse
|
34
|
Choi JY, Park YS, Kim CO, Park YS, Yoon HJ, Shin SY, Kim YA, Song YG, Yong D, Lee K, Kim JM. Mortality risk factors of Acinetobacter baumannii
bacteraemia. Intern Med J 2005; 35:599-603. [PMID: 16207259 DOI: 10.1111/j.1445-5994.2005.00925.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [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: 11/29/2022]
Abstract
BACKGROUND Acinetobacter baumannii is one of the most important nosocomial pathogens, and its multiple antibiotic resistance has emerged as an obstacle in the treatment of these infections worldwide. AIMS To identify risk factors of mortality for A. baumannii bacteraemia. METHODS A retrospective cohort study of 72 patients with significant A. baumannii bacteraemia was conducted to evaluate risk factors for mortality. RESULTS The median age of the 72 enrolled patients was 48 years, 96% of the cases were hospital-acquired, and the bacteraemia-related mortality rate was 29% (21 of 72 patients). Univariate analysis revealed that the risk factors for mortality included: an elevated acute physiology and chronic health evaluation (APACHE II) score, receipt of in vitro ineffective definitive antimicrobial therapy, in vitro A. baumannii resistance to cefoperazone/ sulbactam, neutropenia, and presentation with septic shock. Multivariate analysis reveals that the independent risk factors for mortality are neutropenia and elevated APACHE II scores. CONCLUSION Risk factors such as neutropenia and elevated APACHE II scores are found to be associated with higher mortality rates of A. baumannii bacteraemia. Further study is necessary for the determination of optimal strategies for both the prevention and treatment of these infections.
Collapse
Affiliation(s)
- J Y Choi
- Department of Internal Medicine and AIDS Research Institute, Yonsei University College of Medicine, Seodaemun-gu, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Khan Z, Park SD, Shin SY, Bae SG, Yeon IK, Seo YJ. Management of Meloidogyne incognita on tomato by root-dip treatment in culture filtrate of the blue-green alga, Microcoleus vaginatus. Bioresour Technol 2005; 96:1338-1341. [PMID: 15792580 DOI: 10.1016/j.biortech.2004.11.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2004] [Revised: 11/05/2004] [Accepted: 11/19/2004] [Indexed: 05/24/2023]
Abstract
The nematicidal potential of culture filtrates of the blue-green alga, Microcoleus vaginatus (Cyanobacterium) was tested against Meloidogyne incognita on tomato in pots under greenhouse conditions. Prior to the transplantation of tomato seedling, roots were dipped in different concentrations (0.2%, 0.5%, 1%, 2%, 10%, 50% and 100%) of culture filtrate of M. vaginatus for 30 min. Root-dip treatment reduced the root galling and final population of M. incognita and increased vegetative growth of plants and root-mass production compared with the control. The beneficial effect of root-dip treatment increased with the increase in the concentration of culture filtrate. Root galling and final nematode populations were reduced by 65.9% and 97.5%, respectively when treated at the highest concentration.
Collapse
Affiliation(s)
- Z Khan
- Seongju Fruit-Vegetable Experiment Station, Gyongbuk Provincial ATA, 719-861, Republic of Korea.
| | | | | | | | | | | |
Collapse
|
36
|
Choi JY, Park YS, Cho CH, Park YS, Shin SY, Song YG, Yong D, Lee K, Kim JM. Synergic in-vitro activity of imipenem and sulbactam against Acinetobacter baumannii. Clin Microbiol Infect 2004; 10:1098-101. [PMID: 15606639 DOI: 10.1111/j.1469-0691.2004.00987.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [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: 11/30/2022]
Abstract
The interaction between sulbactam and imipenem was evaluated with four clinical isolates of Acinetobacter baumannii, including two isolates resistant to imipenem, one of which produced IMP-1 metallo-beta-lactamase. Two isolates (one of which was imipenem-resistant) were sulbactam-resistant by undefined mechanisms. MICs were determined by standard broth microdilution methods. Time-kill assays with imipenem and sulbactam, alone or in combination at 0.5 x MIC and 1 x MIC, showed a synergic effect in all four isolates of A. baumannii after incubation for 0, 4, 8 and > 24 h at 35 degrees C.
Collapse
Affiliation(s)
- J Y Choi
- Department of Internal Medicine and AIDS Research Institute, BK21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Abstract
OBJECTIVE To characterize the voltage-activated ion-channel currents in guinea-pig prostate smooth muscle cells (GPSMCs). MATERIALS AND METHODS GPSMCs were isolated using collagenase, and used in a whole-cell patch clamp study. RESULTS When GPSMCs were dialysed with a CsCl solution all the outward K+ currents were blocked and the step-like depolarization (holding voltage -70 mV) of the cell membrane evoked inward currents that were completely blocked by nifedipine (1 micromol/L). With KCl solution, step depolarizations showed outward K+ currents composed of fast, transient outward current (Ito) and outward currents that did not inactivate. Ito was resistant to a high concentration of tetraethylammonium (TEA, 5 mmol/L) but was blocked by 4-aminopyridine (5 mmol/L). The half-activation and half-inactivation voltages of Ito were 6 mV and -58 mV, respectively. With low Ca2+ buffer (0.1 mmol/L EGTA) in the solution, there were spontaneous transient outward currents (STOCs) at depolarized membrane voltages (0 mV). STOCs were blocked by TEA (1 mmol/L) or iberiotoxin (10 nmol/L) but were insensitive to apamin (100 nmol/L). CONCLUSION This voltage-clamp study showed that GPSMCs have l-type Ca2+ channels and more than two types of K+ channels. The voltage- and time-dependent changes of these ion channels and their interactions might be important in forming action potentials and regulating contractility.
Collapse
Affiliation(s)
- S-J Oh
- Department of Physiology, Sungkyunkwan University School of Medicine, Suwon, Korea
| | | | | | | | | | | |
Collapse
|
38
|
Yu K, Park K, Kang SW, Shin SY, Hahm KS, Kim Y. Solution structure of a cathelicidin-derived antimicrobial peptide, CRAMP as determined by NMR spectroscopy. J Pept Res 2002; 60:1-9. [PMID: 12081622 DOI: 10.1034/j.1399-3011.2002.01968.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
CRAMP was identified from a cDNA clone derived from mouse femoral marrow cells as a member of cathelicidin-derived antimicrobial peptides. This peptide shows potent antimicrobial activity against gram-positive and gram-negative bacteria but no hemolytic activity against human erythrocytes. CRAMP was known to cause rapid permeabilization of the inner membrane of Escherichia coli. In this study, the structure of CRAMP in TFE/H2O (1 : 1, v/v) solution was determined by CD and NMR spectroscopy. CD spectra showed that CRAMP adopts a mainly alpha-helical conformation in TFE/H2O solution, DPC micelles, SDS micelles and liposomes, whereas it has a random structure in aqueous solution. The tertiary structure of CRAMP in TFE/H2O (1 : 1, v/v), as determined by NMR spectroscopy, consists of two amphipathic alpha-helices from Leu4 to Lys10 and from Gly16 to Leu33. These two helices are connected by a flexible region from Gly11 to Gly16. Previous analysis of series of fragments composed of various portion of CRAMP revealed that an 18-residue fragment with the sequence from Gly16 to Leu33 was found to retain antibacterial activity. Therefore, the amphipathic alpha-helical region from Gly16 to Leu33 of CRAMP plays important roles in spanning the lipid bilayers as well as its antibiotic activity. Based on this structure, novel antibiotic peptides having strong antibiotic activity, with no hemolytic effect will be developed.
Collapse
Affiliation(s)
- K Yu
- Department of Chemistry, Konkuk University, Seoul, Korea
| | | | | | | | | | | |
Collapse
|
39
|
Ashiuchi M, Kamei T, Baek DH, Shin SY, Sung MH, Soda K, Yagi T, Misono H. Isolation of Bacillus subtilis (chungkookjang), a poly-gamma-glutamate producer with high genetic competence. Appl Microbiol Biotechnol 2001; 57:764-9. [PMID: 11778891 DOI: 10.1007/s00253-001-0848-9] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.4] [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: 10/27/2022]
Abstract
A bacterium with high poly-gamma-glutamate (PGA) productivity was isolated from the traditional Korean seasoning, Chung-Kook-Jang. This bacterium could be classified as a Bacillus subtilis, but sporulation in culture was infrequent in the absence of Mn2+. It was judged to be a variety of B. subtilis and designated B. subtilis (chungkookjang). L-Glutamate significantly induced PGA production, and highly elongated PGAs were synthesized. The volumetric yield reached 13.5 mg ml(-1) in the presence of 2% L-glutamate. The D-glutamate content was over 50% in every PGA produced under the conditions used. During PGA production, glutamate racemase activity was found in the cells, suggesting that the enzyme is involved in the D-glutamate supply. Molecular sizes of PGAs were changed by the salt concentration in the medium; PGAs with comparatively low molecular masses were produced in culture media containing high concentrations of NaCl. B. subtilis (chungkookjang) harbors no plasmid and is the first B. subtilis strain reported with both naturally high PGA productivity and high genetic competence.
Collapse
Affiliation(s)
- M Ashiuchi
- Department of Bioresources Science, Kochi University, Nankoku, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Shin SY, Lee SH, Yang ST, Park EJ, Lee DG, Lee MK, Eom SH, Song WK, Kim Y, Hahm KS, Kim JI. Antibacterial, antitumor and hemolytic activities of alpha-helical antibiotic peptide, P18 and its analogs. J Pept Res 2001; 58:504-14. [PMID: 12005420 DOI: 10.1034/j.1399-3011.2001.00934.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The alpha-helical antibiotic peptide (P18: KWKLFKKIPKFLHLAKKF-NH2) designed from the cecropin A(1-8)-magainin 2 (1-12) hybrid displayed strong bactericidal and tumoricidal activity without inducing hemolysis. The effect of the Pro9 residue at central position of P18 on cell selectivity was investigated by Pro9 --> Leu or Pro9 --> Ser substitution. Either substitution markedly reduced the antibacterial activity of P18 and increased hemolysis, although it did not significantly affect cytotoxicity against human transformed tumor and normal fibroblast cells. These results suggest that a proline kink in alpha-helical antibiotic peptide P18 serves as a hinge region to facilitate ion channel formation on bacterial cell membranes and thus plays an important role in providing high selectivity against bacterial cells. Furthermore, to investigate the structure-antibiotic activity relationships of P18, a series of N- or C-terminal deletion and substitution analogs of P18 were synthesized. The C-terminal region of P18 was related to its antibiotic activity and alpha-helical conformation on lipid membranes rather than N-terminal one. Higher alpha-helicity of the peptides was involved in the hemolytic and antitumor activity rather than antibacterial activity. Except for [L9]-P18 and [S9]-P18, all the designed peptides containing a Pro residue showed potent antibacterial activity, although they did not induce a cytolytic effect against human erythrocyte and normal fibroblast cells at the concentration required to kill bacteria. In particular, P18 and some analogs (N-1, N-2, N-3, N-3L and N-4L) with potent bactericidal and tumoricidal activity and little or no normal cell toxicity may serve as an attractive candidate for the development of novel anti-infective or antitumor agents.
Collapse
Affiliation(s)
- S Y Shin
- Department of Life Science, Kwangju Institute of Science and Technology, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Shin SY, Lee YH, Baek SH, Kim SY, Kim JR, Kim JH. Effect of Phospholipase C-gamma1 Overexpression on the Protein Level of Waf1, PCNA, and Cyclin B1 Following Ultraviolet C Irradiation. Cancer Res Treat 2001; 33:427-32. [PMID: 26680818 DOI: 10.4143/crt.2001.33.5.427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PURPOSE It has been demonstrated that PLC-gamma1 is overexpressed in many tumor cells, and that overexpression of Phospholipase C (PLC)-gamma1 is associated with tumor progression. In order to understand the effect of the PLC-gamma1 overexpression on the regulation of cell cycle regulators following DNA damage, we analyzed the expression level of PCNA, cyclin B1, and p21 Waf1 after ultraviolet C (UVC) irradiation in PLC-gamma1-transfected PC12 cells. MATERIALS AND METHODS PC12 and 3Y1 cells, transfected with empty vector or rat PLC-gamma1 cDNA, were used for this study. Following UVC irradiation, cell cycle progression was analyzed by flow cytometry and protein expression was detected by Western blotting. RESULTS Waf1 protein was markedly down-regulated, whereas PCNA and cyclin B1 was up-regulated in PLC-gamma1 overexpressed-cells as compared to the vector transfected-cells. When the cells were irradiated with UVC, PCNA was slightly increased within 3-hours of the UV irradiation and then was markedly decreased in Vector/ PC12 cells, while it remained high until 37 hour after UVC in PLC-gamma1/PC12 cells. In contrast, cyclin B1 was gradually decreased following UVC irradiation in both cells. CONCLUSION The overexpression of PLC-gamma1 affects the expression level of PCNA after UVC irradiation. We proposed that the overexpression of PLC-gamma1 may contribute to the UV-induced genomic instability by up-regulating the expression of PCNA.
Collapse
|
42
|
Shin SY, Park EJ, Yang ST, Jung HJ, Eom SH, Song WK, Kim Y, Hahm KS, Kim JI. Structure-activity analysis of SMAP-29, a sheep leukocytes-derived antimicrobial peptide. Biochem Biophys Res Commun 2001; 285:1046-51. [PMID: 11467858 DOI: 10.1006/bbrc.2001.5280] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [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: 11/22/2022]
Abstract
SAMP-29 is a cathelecidin-derived antimicrobial peptide deduced from sheep myeloid mRNA. To elucidate the structural-activity relationship of SMAP-29, several analogues were synthesized and their antibiotic activity was investigated. Compared to parental SMAP-29, SMAP-29(1-17) and [K(22,25,27)]-SMAP-29 retained relatively effective antimicrobial activity (MIC: 1.0-8.0 microM), but resulted in a complete loss of hemolytic activity. Pro-19 --> Ala substitution ([A19]-SMAP-29) in SMAP-29 induced a significant reduction in antibacterial activity. These results suggested that the N-terminal amphipathic alpha-helical region and the C-terminal hydrophobic region of SMAP-29 are responsible for antimicrobial activity and hemolytic activity, respectively, and the central Pro-19 in SMAP-29 plays a critical role in showing improved antibacterial activity. In particular, [K(2,7,13)]-SMAP-29(1-17) showed potent antimicrobial activity under high salt conditions without hemolytic activity. Thus, this short peptide could serve as an attractive candidate for the development of therapeutic antimicrobial drugs. Structural analysis by circular dichroism suggested that SMAP-29 seems to adopt a helix-bend/turn-extended random conformation.
Collapse
Affiliation(s)
- S Y Shin
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Shin SY, Kim SY, Kim JH, Min DS, Ko J, Kang UG, Kim YS, Kwon TK, Han MY, Kim YH, Lee YH. Induction of early growth response-1 gene expression by calmodulin antagonist trifluoperazine through the activation of Elk-1 in human fibrosarcoma HT1080 cells. J Biol Chem 2001; 276:7797-805. [PMID: 11121417 DOI: 10.1074/jbc.m009465200] [Citation(s) in RCA: 30] [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: 11/06/2022] Open
Abstract
The early growth response gene-1 (Egr-1) is a transcription factor that plays an important role in cell growth and differentiation. It has been known that Egr-1 expression is down-regulated in many types of tumor tissues, including human fibrosarcoma HT1080 cells, and introduction of the Egr-1 gene into HT1080 cells inhibits cell growth and tumorigenic potential. Trifluoperazine (TFP), a phenothiazine class calmodulin antagonist, is known to inhibit DNA synthesis and cell proliferation and potentially important in antitumor activities. To understand the regulatory mechanism of Egr-1, we investigated the effect of TFP on expression of Egr-1 in HT1080 cells. Herein, we report that Egr-1 expression was increased by TFP in synergy with serum at the transcriptional level. Both the Ca(2+)/calmodulin-dependent protein kinase II inhibitor KN62 and the calcineurin inhibitor cyclosporin A enhanced TFP-dependent increase of Egr-1, suggesting that the Ca(2+)/calmodulindependent pathway plays a role in regulation of Egr-1 expression in HT1080 cells. The TFP-stimulated increase of the Egr-1 protein was preferentially inhibited by the MEK-specific inhibitor PD98059. In addition, activation of human Egr-1 promoter and the transcriptional activation of the ternary complex factor Elk-1 induced by TFP were inhibited both by pretreatment of PD98059 and by expression of the dominant-negative RasN17. These results indicate that the Ras/MEK/Erk/Elk-1 pathway is necessary for TFP-induced Egr-1 expression. We propose that the calmodulin antagonist TFP stimulates Egr-1 gene expression by modulating Ras/MEK/Erk and activation of the Elk-1 pathway in human fibrosarcoma HT1080 cells.
Collapse
Affiliation(s)
- S Y Shin
- Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, Daegu 705-717, South Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Park JH, Cho EW, Lee YJ, Shin SY, Kim KL. Determination of the protective effects of neutralizing anti-hepatitis B virus (HBV) immunoglobulins by epitope mapping with recombinant HBV surface-antigen proteins. Microbiol Immunol 2001; 44:703-10. [PMID: 11021401 DOI: 10.1111/j.1348-0421.2000.tb02552.x] [Citation(s) in RCA: 25] [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] [Indexed: 12/21/2022]
Abstract
Anti-hepatitis B virus (HBV) surface-antigen immunoglobulins prepared from human sera are clinical reagents which have been approved for prophylactic treatment in HBV-exposed persons. The passive immunoprophylaxis with immunoglobulins is meant to cross-link viral particles, which are then further cleared by the host's own immune system. While antibodies specific for both anti-S- and anti-preS proteins have been proved to serve as effective anti-viral agents, so far the fine antigen specificity of clinical immunoglobulin preparations has not been determined. Using recombinant proteins covering the hepatitis B surface antigen, in the present study, the specificity of a commercially available immunoglobulin preparation was determined and immunodominant epitopes were mapped. Here, it is shown that the major reactivity of anti-HBV immunoglobulins is directed against the S-protein, and that no reactivity to the preS2 but a weak binding activity to the preS1 region was detectable. The antigen reactivity within the preS1 region was biased to the C-terminal region, which indicates the presence of a putative B-cell epitope. The evaluation of the antigen specificity and determination of novel protective epitopes will provide valuable information for the further development and improvement of prophylactic HBV immunoglobulins.
Collapse
Affiliation(s)
- J H Park
- Protein Engineering Laboratory, Korea Research Institute of Bioscience and Biotechnology, Taejon
| | | | | | | | | |
Collapse
|
45
|
Oh D, Shin SY, Lee S, Kang JH, Kim SD, Ryu PD, Hahm KS, Kim Y. Role of the hinge region and the tryptophan residue in the synthetic antimicrobial peptides, cecropin A(1-8)-magainin 2(1-12) and its analogues, on their antibiotic activities and structures. Biochemistry 2000; 39:11855-64. [PMID: 11009597 DOI: 10.1021/bi000453g] [Citation(s) in RCA: 131] [Impact Index Per Article: 5.5] [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: 11/28/2022]
Abstract
A 20-residue hybrid peptide CA(1-8)-MA(1-12) (CA-MA), incorporating residues 1-8 of cecropin A (CA) and residues 1-12 of magainin 2 (MA), has potent antimicrobial activity without toxicity against human erythrocytes. To investigate the effects of the Gly-Ile-Gly hinge sequence of CA-MA on the antibacterial and antitumor activities, two analogues in which the Gly-Ile-Gly sequence of CA-MA is either deleted (P1) or substituted with Pro (P2) were synthesized. The role of the tryptophan residue at position 2 of CA-MA on its antibiotic activity was also investigated using two analogues, in which the Trp2 residue of CA-MA is replaced with either Ala (P3) or Leu (P4). The tertiary structures of CA-MA, P2, and P4 in DPC micelles, as determined by NMR spectroscopy, have a short amphiphilic helix in the N-terminus and about three turns of alpha-helix in the C-terminus, with the flexible hinge region between them. The P1 analogue has an alpha-helix from Leu4 to Ala14 without any hinge structure. P1 has significantly decreased lytic activities against bacterial and tumor cells and PC/PS vesicles (3:1, w/w), and reduced pore-forming activity on lipid bilayers, while P2 retained effective lytic activities and pore-forming activity. The N-terminal region of P3 has a flexible structure without any specific secondary structure. The P3 modification caused a drastic decrease in the antibiotic activities, whereas P4, with the hydrophobic Leu side chain at position 2, retained its activities. On the basis of the tertiary structures, antibiotic activities, vesicle-disrupting activities, and pore-forming activities, the structure-function relationships can be summarized as follows. The partial insertion of the Trp2 of CA-MA into the membrane, as well as the electrostatic interactions between the positively charged Lys residues at the N-terminus of the CA-MA and the anionic phospholipid headgroups, leads to the primary binding to the cell membrane. Then, the flexibility or bending potential induced by the Gly-Ile-Gly hinge sequence or the Pro residue in the central part of the peptides may allow the alpha-helix in the C-terminus to span the lipid bilayer. These structural features are crucial for the potent antibiotic activities of CA-MA.
Collapse
Affiliation(s)
- D Oh
- Department of Chemistry, Konkuk University, Seoul 143-701, Korea
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Shin SY, Kang SW, Lee DG, Eom SH, Song WK, Kim JI. CRAMP analogues having potent antibiotic activity against bacterial, fungal, and tumor cells without hemolytic activity. Biochem Biophys Res Commun 2000; 275:904-9. [PMID: 10973820 DOI: 10.1006/bbrc.2000.3269] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [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
CRAMP-18 (GEKLKKIGQKIKNFFQKL) is the antibacterial sequence derived from CRMAP, a member of cathelicidin-derived antimicrobial peptides. To develop the novel antibiotic peptides useful as therapeutic drugs requires strong antibiotic activity against bacterial and fungal cells without hemolytic effect. To this goal, the analogues were designed to increase only net positively charge by Lys-substitution of positions 2, 9, 13, or 16 at the hydrophilic helix face of CRAMP-18 without any change at the hydrophobic helix face. In particular, Lys-substitution (K(2)-CRAMP-18) of position 2 in CRAMP-18 induced the enhanced antibiotic activity without any increase in hemolysis. Thus, this peptide may provide a useful template for the design novel antibiotic peptides for the treatment of infectious diseases. Additional CD spectra studies suggested that the alpha-helical structure of the peptides plays an important role in killing bacterial and fungal cells, but the increase of alpha-helical content is less connected with the enhanced antibiotic activity.
Collapse
Affiliation(s)
- S Y Shin
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea
| | | | | | | | | | | |
Collapse
|
47
|
Abstract
PURPOSE To report the clinical history and surgical management of recurrent congenital iris stromal cyst. METHOD Case report. Argon laser endophotocoagulation and cryotherapy were used to treat a recurrent iris stromal cyst in an 18-month-old boy. RESULTS At 43 months of follow-up, there was no recurrence or evidence of epithelial ingrowth. CONCLUSION Treatment with argon laser endophotocoagulation and cryotherapy resulted in complete resolution of a recurrent congenital iris cyst.
Collapse
Affiliation(s)
- S Y Shin
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | | | | |
Collapse
|
48
|
Koo SH, Kwon KC, Shin SY, Jeon YM, Park JW, Kim SH, Noh SM. Genetic alterations of gastric cancer: comparative genomic hybridization and fluorescence In situ hybridization studies. Cancer Genet Cytogenet 2000; 117:97-103. [PMID: 10704677 DOI: 10.1016/s0165-4608(99)00152-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Genetic changes leading to the development of gastric cancers are still in dispute. In the following study, we used comparative genomic hybridization (CGH) to screen for DNA copy number changes along all chromosomes in 37 gastric carcinomas, and fluorescence in situ hybridization (FISH) with the C-MYC and TP53 probes in 14 cases for comparison. The aim of this study was to identify those chromosome regions that contain genes important for the development of gastric carcinomas and to identify genetic markers associated with tumor progression. The most often involved gains were 2q, 7pq, 8pq, 13q, 17q, 18q, and 20pq. The most commonly deleted regions were 17p. The pattern of genetic changes was different depending on the existence of nodal metastasis and histologic types. Gains in 8q and losses in 17p were the most common features of the CGH changes. However, only 3 among the available 10 cases (30%) showed an amplification of the C-MYC gene by FISH. Allelic loss of TP53 was found in 2 of 4 cases (50%). This difference might be due to another rearrangement of these 2 genes which cannot be detected by FISH, or other possible genes in that area may be involved in the tumorigenesis and nodal metastasis of gastric carcinomas.
Collapse
Affiliation(s)
- S H Koo
- Department of Clinical Pathology, Chungnam National University Hospital, Taejon, South Korea
| | | | | | | | | | | | | |
Collapse
|
49
|
Shin SY, Kang JH, Jang SY, Kim Y, Kim KL, Hahm KS. Effects of the hinge region of cecropin A(1-8)-magainin 2(1-12), a synthetic antimicrobial peptide, on liposomes, bacterial and tumor cells. Biochim Biophys Acta 2000; 1463:209-18. [PMID: 10675500 DOI: 10.1016/s0005-2736(99)00210-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A 20-residue hybrid peptide (CA(1-8)-MA(1-12): KWKLFKKIGIGKFLHSAKKF-NH(2)) incorporating 1-8 residues of cecropin A (CA) and 1-12 residues of magainin 2 (MA) has potent antibiotic activity without hemolytic activity. In order to investigate the effects of the flexible hinge sequence, Gly-Ile-Gly of CA(1-8)-MA(1-12) (CA-MA) on antibiotic activity, CA-MA and its three analogues, CA-MA1, CA-MA2 and CA-MA3 were synthesized. The Gly-Ile-Gly sequence of CA-MA was deleted in CA-MA1 and replaced with Pro and Gly-Pro-Gly in CA-MA2 and CA-MA3, respectively. CA-MA1 and CA-MA3 caused a significant decrease in the bactericidal rate against Escherichia coli and Bacillus subtilis and the tumoricidal activity against four different tumor cells, and the PC/PS (4:1, w/w) vesicle-aggregating and disrupting activities. However, CA-MA2 showed a similar bactericidal rate and antitumor, vesicle-aggregating and disrupting activities, as compared with CA-MA. These results suggested that the flexibility or beta-turn induced by Gly-Ile-Gly or Pro in the central part of CA-MA may be important in the electrostatic interaction of the cationic short alpha-helical region in the N-terminus with the cell membrane surface and the hydrophobic interaction of amphipathic alpha-helical region in the C-terminus with the hydrophobic acyl chains in the cell membrane. CA-MA3 exhibited lower activity in antibacterial, antitumor, and vesicle-aggregating and disrupting activities than CA-MA and CA-MA2. This result suggested that the excessive beta-turn structure by Gly-Pro-Gly in CA-MA3 seems to interrupt the ion channel/pore formation on the lipid bilayer. It was concluded that the appropriate flexibility or beta-turn structure provided by the central hinge is responsible for the effective antibiotic activity of the antimicrobial peptides with the helix-hinge-helix structure.
Collapse
Affiliation(s)
- S Y Shin
- Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology, P.O. Box 115, Yusong, Taejon, South Korea
| | | | | | | | | | | |
Collapse
|
50
|
Abstract
Anterior ischemic optic neuropathy(AION) is known to be caused by circulatory disturbance in the anterior optic nerve(AON). Because the AON shares blood supply from the paraoptic short posterior ciliary artery with peripapillary choroid, the authors investigated the angiographic evidences of combined choroidal insufficiency in patients with acute AION. Fundus fluorescein angiograms from 30 eyes from 28 patients with acute AION were enrolled in this study. The diagnosis of acute AION was based primarily on angiographic evidences of filling delay of optic nerve head and the various clinical features, such as decreased visual acuity, visual field defects, afferent pupillary defect, and optic disc swelling. Angiographic evidences of combined choroidal filling delay were as follows: 1) circular or localized filling delay of peripapillary choroid in 15 eyes (50%), 2) generalized filling delay of posterior pole in 11 eyes (36.7%), 3) filling delay of unilateral choroid divided by watershed zone in 5 eyes (16.7%), and 4) choriocapillary filling delay in 10 eyes (33.3%). In this study, various types of choroidal insufficiency in patients with AION were observed, which helped us to differentiate AION from the other various diseases of the anterior optic nerve.
Collapse
Affiliation(s)
- S Y Shin
- Department of Ophthalmology, School of Medicine, Hanyang University, Seoul, Korea
| | | | | |
Collapse
|