1
|
Lim YM, Uhm JS, Kim M, Kim IS, Jin MN, Yu HT, Kim TH, Lee HJ, Kim YJ, Joung B, Pak HN, Lee MH. Subclinical cardiac perforation by cardiac implantable electronic device leads detected by cardiac computed tomography. BMC Cardiovasc Disord 2021; 21:346. [PMID: 34281506 PMCID: PMC8290553 DOI: 10.1186/s12872-021-02159-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Accepted: 07/08/2021] [Indexed: 11/10/2022] Open
Abstract
Background The relationship between the characteristics of cardiac implantable electronic device (CIED) leads and subclinical cardiac perforations remains unclear. This study aimed to evaluate the incidence of subclinical cardiac perforation among various CIED leads using cardiac computed tomography (CT). Methods A total of 271 consecutive patients with 463 CIED leads, who underwent cardiac CT after CIED implantation, were included in this retrospective observational study. Cardiac CT images were reviewed by one radiologist and two cardiologists. Subclinical perforation was defined as traversal of the lead tip past the outer myocardial layer without symptoms and signs related to cardiac perforation. We compared the subclinical cardiac perforation rates of the available lead types. Results A total of 219, 49, and 3 patients had pacemakers, implantable cardioverter-defibrillators, and cardiac resynchronization therapy, respectively. The total subclinical cardiac perforation rate was 5.6%. Subclinical cardiac perforation by screw-in ventricular leads was significantly more frequent than that caused by tined ventricular leads (13.3% vs 3.3%, respectively, p = 0.002). There were no significant differences in the incidence of cardiac perforation between atrial and ventricular leads, screw-in and tined atrial leads, pacing and defibrillator ventricular leads, nor between magnetic resonance (MR)-conditional and MR-unsafe screw-in ventricular leads. Screw-in ventricular leads were significantly associated with subclinical cardiac perforation [odds ratio, 4.554; 95% confidence interval, 1.587–13.065, p = 0.005]. There was no case subclinical cardiac perforation by septal ventricular leads. Conclusions Subclinical cardiac perforation by screw-in ventricular leads is not rare. Septal pacing may be helpful in avoiding cardiac perforation. Supplementary Information The online version contains supplementary material available at 10.1186/s12872-021-02159-3.
Collapse
Affiliation(s)
- Yeong-Min Lim
- Division of Cardiology, Department of Internal Medicine, Saint Carollo Hospital, Suncheon, Jeollanam-do, Republic of Korea
| | - Jae-Sun Uhm
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea.
| | - Min Kim
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - In-Soo Kim
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - Moo-Nyun Jin
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - Hee Tae Yu
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - Tae-Hoon Kim
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - Hye-Jeong Lee
- Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Young-Jin Kim
- Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Boyoung Joung
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - Hui-Nam Pak
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| | - Moon-Hyoung Lee
- Department of Cardiology, Yongin Severance Hospital, Yonsei University College of Medicine, 363 Dongbaekjukjeondaero Giheung-gu Yongin, Seoul, Gyeonggi-do, Republic of Korea
| |
Collapse
|
2
|
Lim YM, Eo H, Kim KH, Lee MY, Chung CW. A wafer-like apparatus for two-dimensional measurement of plasma parameters and temperature distribution in low-temperature plasmas. Rev Sci Instrum 2021; 92:053531. [PMID: 34243301 DOI: 10.1063/5.0044115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 04/23/2021] [Indexed: 06/13/2023]
Abstract
A wafer-type monitoring apparatus that can simultaneously measure the two-dimensional (2D) distributions of substrate temperature and plasma parameters is developed. To measure the temperature of the substrate, a platinum resistance temperature detector is used. The plasma density and electron temperature are obtained using the floating harmonics method, and incoming heat fluxes from the plasma to the substrate are obtained from the plasma density and electron temperature. In this paper, 2D distributions of the substrate temperature, plasma density, and electron temperature are obtained simultaneously for the first time in inductively coupled plasma. The shapes of the 2D distributions of the substrate temperature and incoming heat flux are similar to each other, but some differences are found. To understand that, an energy balance equation for the substrate is established, which shows good agreement with the experimental results. This apparatus will promote the understanding of surface reactions, which are very sensitive to the temperatures and plasma densities in plasma processing.
Collapse
Affiliation(s)
- Yeong-Min Lim
- Department of Electrical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea
| | - Hyundong Eo
- Department of Electrical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea
| | - Kyung-Hyun Kim
- Department of Electrical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea
| | - Moo-Young Lee
- Department of Nanoscale Semiconductor Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea
| | - Chin-Wook Chung
- Department of Electrical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea
| |
Collapse
|
3
|
Lim YM, Yang PS, Jang E, Yu HT, Kim TH, Uhm JS, Kim JY, Pak HN, Lee MH, Joung B, Lip GYH. Body Mass Index Variability and Long-term Risk of New-Onset Atrial Fibrillation in the General Population: A Korean Nationwide Cohort Study. Mayo Clin Proc 2019; 94:225-235. [PMID: 30711120 DOI: 10.1016/j.mayocp.2018.10.019] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 09/19/2018] [Accepted: 10/04/2018] [Indexed: 01/18/2023]
Abstract
OBJECTIVE To assess the effects of body mass index (BMI) variability on the incidence of new-onset atrial fibrillation (AF), stroke, cardiovascular (CV) risk factors, and CV outcomes in a general Asian population. PATIENTS AND METHODS Data from the National Health Insurance Service-Health Screening cohort in Korea were used: 171,324 patients without AF were included, and BMI measurements occurred biennially from January 1, 2002, through December 31, 2009. Patient outcomes were followed through 2013. The BMI intraindividual variability between visits was measured. RESULTS During mean ± SD follow-up of 47.4±3.9 months, 1959 patients (1.1%) developed new-onset AF. Overweight or obesity (BMI ≥25) had a greater risk of new-onset AF compared with BMI of 20 to 22.5, with a hazard ratio (HR) of 1.24 (95% CI, 1.10-1.41; P<.001). In underweight or normal-weight participants (initial BMI <25), a 1-kg/m2 increase of BMI variability increased the risk of new-onset AF, with an adjusted HR (aHR) of 1.13 (95% CI, 1.01-1.25; P=.02). Weight gain increased the risk of new-onset AF (aHR, 1.32; 95% CI, 1.01-1.71; P=.04) and myocardial infarction (aHR, 1.52; 95% CI, 1.06-2.18; P=.02) but not stroke. In this group, blood pressure, glucose level, and total cholesterol level were higher in individuals with the greatest BMI variability compared with those with stable BMI. CONCLUSION In the underweight and normal-weight Asian population, BMI variability, especially weight gain, was related to increased risk of new-onset AF and myocardial infarction. Avoiding weight gain is important to improve CV outcomes.
Collapse
Affiliation(s)
- Yeong-Min Lim
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea; Department of Cardiology, Anyang SAM Medical Center, Korea
| | - Pil-Sung Yang
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Eunsun Jang
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Hee Tae Yu
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Tae-Hoon Kim
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Jae-Sun Uhm
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Jong-Youn Kim
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Hui-Nam Pak
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Moon-Hyoung Lee
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea
| | - Boyoung Joung
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea.
| | - Gregory Y H Lip
- Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea; Institute of Cardiovascular Sciences, University of Birmingham, United Kingdom; Liverpool Centre for Cardiovascular Science, University of Liverpool, United Kingdom.
| |
Collapse
|
4
|
Lim YM, Moon JY, Min D, Kim SH, Yang WI, Kim WJ, Sung JH, Kim IJ, Lim SW, Cha DH. Serial measurements of neutrophil gelatinase-associated lipocalin: prognostic value in patients with ST-segment elevation myocardial infarction treated with a primary percutaneous coronary intervention. Coron Artery Dis 2018; 28:690-696. [PMID: 28737526 DOI: 10.1097/mca.0000000000000542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 12/21/2022]
Abstract
BACKGROUND There are no previous data on serial changes in neutrophil gelatinase-associated lipocalin (NGAL) levels in ST-segment elevation myocardial infarction (STEMI) patients before and after a primary percutaneous coronary intervention (pPCI). The aim of the present study was to evaluate the prognostic value of serial NGAL measurements in patients with STEMI treated by pPCI. MATERIALS AND METHODS We identified 169 STEMI patients who underwent pPCI within 12 h of symptom onset and had plasma NGAL measurements before (pre-NGAL) and 6 h after (post-NGAL) pPCI. The primary endpoint was 30-day all-cause mortality, including cardiac death, whereas the secondary endpoint was the change in NGAL levels from before to after pPCI. RESULTS The mean pre-NGAL and post-NGAL levels were 109.2±76.1 and 93.3±83.8 ng/ml, respectively. Thirty-day mortality occurred in 12 (7.1%) patients. In terms of changes in serial NGAL levels, post-NGAL levels were decreased in 132 (79%) patients. Patients with elevated post-NGAL levels showed increased mortality compared with patients with decreased post-NGAL levels (P=0.005). Multivariate analyses indicated that old age and high post-NGAL levels were independent risk factors for 30-day mortality. CONCLUSION In a large percentage of STEMI patients, plasma post-pPCI NGAL levels were decreased compared with pre-pPCI NGAL levels, even with the administration of potentially nephrotoxic contrast medium. Post-NGAL levels seemed to be superior to pre-NGAL levels for the prediction of 30-day mortality outcome.
Collapse
Affiliation(s)
- Yeong-Min Lim
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Lee SS, Ae Kong K, Kim D, Lim YM, Yang PS, Yi JE, Kim M, Kwon K, Bum Pyun W, Joung B, Park J. Clinical implication of an impaired fasting glucose and prehypertension related to new onset atrial fibrillation in a healthy Asian population without underlying disease: a nationwide cohort study in Korea. Eur Heart J 2018; 38:2599-2607. [PMID: 28662568 DOI: 10.1093/eurheartj/ehx316] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [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: 10/17/2016] [Accepted: 05/25/2017] [Indexed: 11/14/2022] Open
Abstract
Aims For healthy populations without comorbidities, whether prehypertension and impaired fasting glucose (IFG) are associated with new onset atrial fibrillation (AF) is not well known. Methods and results We included 366 507 subjects (age ≥20 years) not diagnosed with non-valvular AF from the Korean National Health Insurance Service-National Sample Cohort (NHIS-NSC) from 2003 to 2008. In total, 139 306 subjects diagnosed with AF-related comorbidities were excluded, and a 227 102 healthy population was followed up until 2013. The body mass index (BMI), blood pressure (BP), and fasting blood glucose (BG) level were acquired during National health check-ups. Subjects with IFG [hazard ratio (HR) 1.16, P = 0.017] had a higher AF risk and the diastolic BP (HR 1.11, P = 0.045) was a stronger indicator for an AF incidence than the systolic BP. After dividing the subjects into two mutually exclusive groups, AF incidence was increased dramatically by the combination effect of both prehypertension and an IFG in BMI <25 kg/m2 group, but, in BMI ≧25 kg/m2 group, did not show this tendency. An IFG related to AF risk was more prominent in the BMI <25 kg/m2 population (HR 1.18, P = 0.025) than those with a BMI ≥25 kg/m2, and subjects with both an IFG and prehypertension had a greater AF risk (HR 1.27, P = 0.016) than those without. Conclusion Even in a healthy Asian populations without comorbidities, prehypertension and IFG were important risk factors of AF. Specifically, when prehypertension, including systolic and diastolic BPs, was finally combined with the IFG, the risk of new onset AF was increased especially in the BMI <25 kg/m2 group.
Collapse
Affiliation(s)
- Sean S Lee
- Program in Liberal Medical Education, The Warren Alpert Medical School, Brown University, 222 Richmond St, Providence, Rhode Island 02903, USA
| | - Kyoung Ae Kong
- Department of Preventive Medicine, College of Medicine, Ewha Womans University, 1071, Annyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| | - Daehoon Kim
- Yonsei University Health System, Yonsei Cardiovascular Hospital, Yonsei University College of Medicine, 250 Seungsanno, Seodaemun-gu, Seoul 120-752, Republic of Korea
| | - Yeong-Min Lim
- Yonsei University Health System, Yonsei Cardiovascular Hospital, Yonsei University College of Medicine, 250 Seungsanno, Seodaemun-gu, Seoul 120-752, Republic of Korea
| | - Pil-Sung Yang
- Yonsei University Health System, Yonsei Cardiovascular Hospital, Yonsei University College of Medicine, 250 Seungsanno, Seodaemun-gu, Seoul 120-752, Republic of Korea
| | - Jeong-Eun Yi
- Department of Cardiology, College of Medicine, Ewha Womans University, 1071, Annyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| | - Minsuk Kim
- Department of Pharmacology, School of Medicine, Ewha Womans University, 1071, Annyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| | - Kihwan Kwon
- Department of Cardiology, College of Medicine, Ewha Womans University, 1071, Annyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| | - Wook Bum Pyun
- Department of Cardiology, College of Medicine, Ewha Womans University, 1071, Annyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| | - Boyoung Joung
- Yonsei University Health System, Yonsei Cardiovascular Hospital, Yonsei University College of Medicine, 250 Seungsanno, Seodaemun-gu, Seoul 120-752, Republic of Korea
| | - Junbeom Park
- Department of Cardiology, College of Medicine, Ewha Womans University, 1071, Annyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
| |
Collapse
|
6
|
Lim YM, Yang PS, Jang ES, Yu HT, Kim TH, Uhm JS, Sung JH, Kim JY, Pak HN, Lee MH, Joung B, Lip GYH. 1009Body mass index variability and long-term risk of new-onset atrial fibrillation in the general population: a korean nationwide cohort study. Europace 2018. [DOI: 10.1093/europace/euy015.558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Y M Lim
- SAM medical center, Anyang, Korea Republic of
| | - P S Yang
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - E S Jang
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - H T Yu
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - T H Kim
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - J S Uhm
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - J H Sung
- CHA University, Seongnam, Korea Republic of
| | - J Y Kim
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - H N Pak
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - M H Lee
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - B Joung
- Yonsei Cardiovascular Center, Seoul, Korea Republic of
| | - GYH Lip
- University of Birmingham, Birmingham, United Kingdom
| |
Collapse
|
7
|
Lim YM, Kim JS, Kim TH, Uhm JS, Shim CY, Joung B, Hong GR, Lee MH, Jang YS, Pak HN. Delayed left atrial appendage contrast filling in computed tomograms after percutaneous left atrial appendage occlusion. J Cardiol 2017; 70:571-577. [DOI: 10.1016/j.jjcc.2017.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 04/05/2017] [Accepted: 04/21/2017] [Indexed: 10/19/2022]
|
8
|
Kim IJ, Moon JY, Ko EJ, Lim YM, Kim SH, Yang WI, Sung JH, Lim SW, Cha DH. Prognostic value of preoperative N-terminal pro-brain natriuretic peptide in non-cardiac surgery of elderly patients with normal left ventricular systolic function. Geriatr Gerontol Int 2015; 16:1109-1116. [PMID: 26336935 DOI: 10.1111/ggi.12597] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/06/2015] [Indexed: 11/29/2022]
Abstract
AIM We investigated the prognostic value of preoperative N-terminal pro-brain natriuretic peptide (NT-proBNP) in non-cardiac surgery in elderly patients who showed normal left ventricular function on preoperative echocardiography. METHODS We analyzed 1459 patients aged older than 70 years who had consulted a cardiologist for the evaluation of cardiovascular risk for non-cardiac surgery. Of the 721 patients who simultaneously underwent echocardiography and NT-proBNP assessments, 506 who showed normal left ventricular systolic function were included. The predictive power of NT-proBNP for the risk of major adverse cardiac and cerebrovascular events (MACCE) was evaluated. RESULTS MACCE occurred in 40 (7.9%) of the 506 patients, and the median value of NT-proBNP was higher in patients with complications than in those without (MACCE group: 1700.5 pg/mL vs non MACCE group: 206.35 pg/mL; P < 0.001). The area under the receiver operating characteristic curve was 0.804 (P < 0.001), with an optimal cut-off of 425.3 pg/mL. Multivariate analysis showed that increased NT-proBNP (>425.3 pg/mL; odds ratio 6.381; P < 0.001) was the only independent risk factor for the prediction of MACCE. CONCLUSIONS In elderly patients who showed normal left ventricular systolic function on echocardiography, measurement of preoperative NT-proBNP concentration might be a useful test for predicting the occurrence of MACCE after non-cardiac surgery. Geriatr Gerontol Int 2016; 16: 1109-1116.
Collapse
Affiliation(s)
- In Jai Kim
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Jae Youn Moon
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
| | - Eun-Jung Ko
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Yeong-Min Lim
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Sang Hoon Kim
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Woo-In Yang
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Jung-Hoon Sung
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Sang-Wook Lim
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| | - Dong-Hun Cha
- Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
| |
Collapse
|
9
|
Yap WH, Khoo KS, Lim SH, Yeo CC, Lim YM. Proteomic analysis of the molecular response of Raji cells to maslinic acid treatment. Phytomedicine 2012; 19:183-191. [PMID: 21893403 DOI: 10.1016/j.phymed.2011.08.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2011] [Revised: 06/25/2011] [Accepted: 08/08/2011] [Indexed: 05/31/2023]
Abstract
Maslinic acid, a natural pentacyclic triterpene has been shown to inhibit growth and induce apoptosis in some tumour cell lines. We studied the molecular response of Raji cells towards maslinic acid treatment. A proteomics approach was employed to identify the target proteins. Seventeen differentially expressed proteins including those involved in DNA replication, microtubule filament assembly, nucleo-cytoplasmic trafficking, cell signaling, energy metabolism and cytoskeletal organization were identified by MALDI TOF-TOF MS. The down-regulation of stathmin, Ran GTPase activating protein-1 (RanBP1), and microtubule associated protein RP/EB family member 1 (EB1) were confirmed by Western blotting. The study of the effect of maslinic acid on Raji cell cycle regulation showed that it induced a G1 cell cycle arrest. The differential proteomic changes in maslinic acid-treated Raji cells demonstrated that it also inhibited expression of dUTPase and stathmin which are known to induce early S and G2 cell cycle arrests. The mechanism of maslinic acid-induced cell cycle arrest may be mediated by inhibiting cyclin D1 expression and enhancing the levels of cell cycle-dependent kinase (CDK) inhibitor p21 protein. Maslinic acid suppressed nuclear factor-kappa B (NF-κB) activity which is known to stimulate expression of anti-apoptotic and cell cycle regulatory gene products. These results suggest that maslinic acid affects multiple signaling molecules and inhibits fundamental pathways regulating cell growth and survival in Raji cells.
Collapse
Affiliation(s)
- W H Yap
- Faculty of Science, Universiti Tunku Abdul Rahman, Bandar Barat, Kampar, Perak, Malaysia
| | | | | | | | | |
Collapse
|
10
|
Mok SY, Nadasdy Z, Lim YM, Goh SY. Ultra-slow oscillations in cortical networks in vitro. Neuroscience 2012; 206:17-24. [PMID: 22266346 DOI: 10.1016/j.neuroscience.2012.01.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 12/08/2011] [Accepted: 01/04/2012] [Indexed: 10/14/2022]
Abstract
An ultra-slow oscillation (<0.01 Hz) in the network-wide activity of dissociated cortical networks is described in this article. This slow rhythm is characterized by the recurrence of clusters of large synchronized bursts of activity lasting approximately 1-3 min, separated by an almost equivalent interval of relatively smaller bursts. Such rhythmic activity was detected in cultures starting from the fourth week in vitro. Our analysis revealed that the propagation motifs of constituent bursts were strongly conserved across multiple oscillation cycles, and these motifs were more consistent at the electrode level compared with the neuronal level.
Collapse
Affiliation(s)
- S Y Mok
- Department of Mechatronics and Biomedical Engineering, Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, Setapak 53300, Kuala Lumpur, Malaysia.
| | | | | | | |
Collapse
|
11
|
Affiliation(s)
- S You
- Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap-dong, Songpa-gu, Seoul, 138-736, South Korea
| | | | | | | | | |
Collapse
|
12
|
Hirschhorn JN, Sklar P, Lindblad-Toh K, Lim YM, Ruiz-Gutierrez M, Bolk S, Langhorst B, Schaffner S, Winchester E, Lander ES. SBE-TAGS: an array-based method for efficient single-nucleotide polymorphism genotyping. Proc Natl Acad Sci U S A 2000; 97:12164-9. [PMID: 11035790 PMCID: PMC17312 DOI: 10.1073/pnas.210394597] [Citation(s) in RCA: 138] [Impact Index Per Article: 5.8] [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: 01/13/2023] Open
Abstract
Generating human single-nucleotide polymorphisms (SNPs) is no longer a rate-limiting step for genetic studies of disease. The number of SNPs in public databases already exceeds 200,000, and the total is expected to exceed 1,000,000 within a year. Rather, progress is limited by the inability to genotype large numbers of SNPs. Current genotyping methods are suitable for studying individual loci or at most a handful at a time. Here, we describe a method for parallel genotyping of SNPs, called single base extension-tag array on glass slides, SBE-TAGS. The principle is as follows. SNPs are genotyped by single base extension (SBE), using bifunctional primers carrying a unique sequence tag in addition to a locus-specific sequence. Because each locus has a distinct tag, the genotyping reactions can be performed in a highly multiplexed fashion, and the resulting product can then be "demultiplexed" by hybridization to the reverse complements of the sequence tags arrayed on a glass slide. SBE-TAGS is simple and inexpensive because of the high degree of multiplexing and the use of an easily generated, generic tag array. The method is also highly accurate: we genotyped over 100 SNPs, obtaining over 5, 000 genotypes, with approximately 99% accuracy.
Collapse
Affiliation(s)
- J N Hirschhorn
- Whitehead Institute/MIT Center for Genome Research, One Kendall Square, Building 300, Cambridge, MA 02139, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Abstract
Cellular transformation by the BCR/ABL oncogene depends on the ABL-encoded tyrosine kinase activity. To block BCR/ABL function, we created a unique tyrosine phosphatase by fusing the catalytic domain of SHP1 (SHP1c) to the ABL binding domain (ABD) of RIN1, an established binding partner and substrate for c-ABL and BCR/ABL. This fusion construct (ABD/SHP1c) binds to BCR/ABL in cells and functions as an active phosphatase. ABD/SHP1c effectively suppressed BCR/ABL function as judged by reductions in transformation of fibroblast cells, growth factor independence of hematopoietic cell lines, and proliferation of primary bone marrow cells. In addition, the leukemogenic properties of BCR/ABL in a murine model system were blocked by coexpression of ABD/SHP1c. Both the "escort" function provided by ABD and the inhibitor function provided by the phosphatase of SHP1c were necessary for effective BCR/ABL interference. Expression of ABD/SHP1c also reversed the transformed phenotype of K562, a human leukemia-derived cell line. These results have direct implications for leukemia therapeutics and suggest an approach to block aberrant signal transduction in other pathologies through the use of appropriately designed escort/inhibitors.
Collapse
Affiliation(s)
- Y M Lim
- Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
| | | | | | | | | |
Collapse
|
14
|
Abstract
Genetic and molecular characterization of the dominant suppressors of D-raf(C110) on the second chromosome identified two gain-of-function alleles of rolled (rl), which encodes a mitogen-activated protein (MAP) kinase in Drosophila. One of the alleles, rl(Su23), was found to bear the same molecular lesion as rl(Sem), which has been reported to be dominant female sterile. However, rl(Su23) and the current stock of rl(Sem) showed only a weak dominant female sterility. Detailed analyses of the rl mutations demonstrated moderate dominant activities of these alleles in the Torso (Tor) signaling pathway, which explains the weak dominant female sterility observed in this study. The dominant rl mutations failed to suppress the terminal class maternal-effect mutations, suggesting that activation of Rl is essential, but not sufficient, for Tor signaling. Involvement of rl in cell proliferation was also demonstrated by clonal analysis. Branching and integration of signals in the MAP kinase cascade is discussed.
Collapse
Affiliation(s)
- Y M Lim
- Laboratory of Developmental Biology, Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
| | | | | | | | | | | |
Collapse
|
15
|
Lim YM, Tsuda L, Inoue YH, Irie K, Adachi-Yamada T, Hata M, Nishi Y, Matsumoto K, Nishida Y. Dominant mutations of Drosophila MAP kinase kinase and their activities in Drosophila and yeast MAP kinase cascades. Genetics 1997; 146:263-73. [PMID: 9136016 PMCID: PMC1207941 DOI: 10.1093/genetics/146.1.263] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Eight alleles of Dsor1 encoding a Drosophila homologue of mitogen-activated protein (MAP) kinase kinase were obtained as dominant suppressors of the MAP kinase kinase kinase D raf. These Dsor1 alleles themselves showed no obvious phenotypic consequences nor any effect on the viability of the flies, although they were highly sensitive to upstream signals and strongly interacted with gain-of-function mutations of upstream factors. They suppressed mutations for receptor tyrosine kinases (RTKs); torso (tor), sevenless (sev) and to a lesser extent Drosophila EGF receptor (DER). Furthermore, the Dsor1 alleles showed no significant interaction with gain-of-function mutations of DER. The observed difference in activity of the Dsor1 alleles among the RTK pathways suggests Dsor1 is one of the components of the pathway that regulates signal specificity. Expression of Dsor1 in budding yeast demonstrated that Dsor1 can activate yeast MAP kinase homologues if a proper activator of Dsor1 is coexpressed. Nucleotide sequencing of the Dsor1 mutant genes revealed that most of the mutations are associated with amino acid changes at highly conserved residues in the kinase domain. The results suggest that they function as suppressors due to increased reactivity to upstream factors.
Collapse
Affiliation(s)
- Y M Lim
- Laboratory of Developmental Biology, Graduate School of Science, Nagoya University, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Nishida Y, Inoue YH, Tsuda L, Adachi-Yamada T, Lim YM, Hata M, Ha HY, Sugiyama S. The Raf/MAP kinase cascade in cell cycle regulation and differentiation in Drosophila. Cell Struct Funct 1996; 21:437-44. [PMID: 9118253 DOI: 10.1247/csf.21.437] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Y Nishida
- Department of Biology, School of Science, Nagoya University, Japan
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Cromwell SL, Russell CK, Lim YM, Luna I, Torres de Ardon E, Phillips LR. Uncovering the cultural context for quality of family caregiving for elders. West J Nurs Res 1996; 18:284-97. [PMID: 8693723 DOI: 10.1177/019394599601800305] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This article is part of a symposium exploring issues in developing cross-culturally equivalent conceptualizations and measures for a study of elder family caregiving. This article describes the development of an instrument to measure quality of elder family caregiving among Anglo and Mexican American caregivers. Following a review of typical approaches for evaluating quality of caregiving, a cross-cultural standard for excellence in elder caregiving is described. An instrument consistent with the United Nations Universal Declaration of Human Rights, the QUALCARE Scale, is identified as an appropriate cross-cultural instrument for assessing the quality of elder family caregiving. Refinement of the QUALCARE Scale using Berry's model for cross-cultural research, which necessitated identification of appropriate cross-cultural indicators of quality, is described. Examples of this process of indicator clarification are given for several basic human rights, based on the cross-cultural research team members' experiences with Anglo and Mexican American caregivers.
Collapse
Affiliation(s)
- S L Cromwell
- School of Nursing, University of Texas Health Science Center, San Antonio, USA
| | | | | | | | | | | |
Collapse
|
18
|
Abstract
This article is part of a symposium that explores the issues involved in developing cross-culturally equivalent conceptualizations and measures for studying family caregiving. The examples used are from the instrument development phase of an ongoing program of research designed to generate and test a theory that explains the quality of family caregiving for frail elders at home. This article provides the background for the symposium by introducing the symposium's unifying theme: cross-cultural equivalence. The process described is based on the experiences of the cross-cultural research team and Berry's model for developing cross-culturally equivalent research.
Collapse
Affiliation(s)
- L R Phillips
- College of Nursing, University of Arizona, Tucson, USA
| | | | | | | | | | | | | |
Collapse
|
19
|
Abstract
This article is part of a symposium describing the development of cross-culturally relevant instruments to measure familism, caregiver burden, and quality of elder caregiving among Anglo- and Mexican American caregivers. This article explores issues involved in measuring caregiving burden. Caregiving burden is thought to adversely affect family caregiving, but the influence of culture on perceptions of burden has not been explored. Because no research focuses on caregiving burden among Mexican American caregivers, the first step involved reviewing the literature for cultural factors influencing caregiving and using the expertise of the cross-cultural team to identify and compare the meaning of caregiving burden in both groups. Next, two instrumentation studies were done to analyze the items on Poulshock and Deimling's Burden Instrument for comparable meaning and internal consistency within and between groups. The third step involved assessing the validity of Poulshock and Deimling's conceptualization of burden cross-culturally.
Collapse
Affiliation(s)
- Y M Lim
- Department of Nursing, Kwandong University, Naegok-dong, Kangreung, Korea
| | | | | | | | | | | |
Collapse
|
20
|
Abstract
Although familism has been studied in both Mexican American and Anglo families, there is controversy about whether familism in both groups is the same. Research has shown great within-group variability, and in addition, the kinship structure in the two groups is fundamentally different. This article explores the cross-cultural issues in conceptualizing familism and its relevance to caregiving among Anglo and Mexican American caregivers. Based on data obtained in an ongoing research program, the process of arriving at similarities and differences in the expression of familism is discussed using Berry's criteria for achieving cultural equivalence.
Collapse
Affiliation(s)
- I Luna
- College of Nursing, University of Arizona, Tucson, USA
| | | | | | | | | | | |
Collapse
|
21
|
Abstract
Pectin methylesterase (PME) (EC 3.1.1.11) has been purified to apparent homogeneity from ripe papaya fruits. The purification protocol consisted of ammonium sulphate precipitation (60-80%) and cation exchange chromatography in CM Sepharose CL-6B and Mono S. Papaya PME consists of two components (PME 1 and PME 2), which have been shown to be isoenzymes by Ferguson plot analysis. The molecular weight of the enzyme is 27,000 while its isoelectric point is greater than pH 9.0. The N-terminal sequences of PME 1 and PME 2 are SVVTPNAVVADDGVFXFKTG. Both PME 1 and PME 2 showed optimum activities at pH 8.0 and 35 degrees C. The average Kms of PME 1 and PME 2 are 0.0071 and 0.0166 g/liter pectin respectively, while the corresponding average Vmaxs are 741 and 800 mumol methanol/min/mg protein, respectively. Papaya pectin methylesterase is activated by cations, but the effect is more pronounced for divalent than monovalent cations. Inhibition studies showed that sucrose is a noncompetitive inhibitor while p-chloromercuribenzoic acid has no significant effect on its activity.
Collapse
Affiliation(s)
- Y M Lim
- Department of Biochemistry, National University of Singapore
| | | |
Collapse
|
22
|
Tsuda L, Inoue YH, Yoo MA, Mizuno M, Hata M, Lim YM, Adachi-Yamada T, Ryo H, Masamune Y, Nishida Y. A protein kinase similar to MAP kinase activator acts downstream of the raf kinase in Drosophila. Cell 1993; 72:407-14. [PMID: 8381718 DOI: 10.1016/0092-8674(93)90117-9] [Citation(s) in RCA: 185] [Impact Index Per Article: 6.0] [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: 01/30/2023]
Abstract
D-raf, a Drosophila homolog of Raf-1, plays key roles in multiple signal transduction pathways. Dsor1, a putative factor downstream of D-raf, was genetically identified by screening of dominant suppressors of D-raf. Dsor1Su1 mapped on X chromosome significantly suppressed the D-raf mutant phenotypes, and the loss-of-function mutations of Dsor1 showed phenotypes similar to those of the D-raf null mutations. Dsor1Su1 also significantly suppressed the mutations of other terminal class genes acting further upstream of D-raf. Molecular cloning of Dsor1 revealed its product with striking similarity to the microtubule-associated protein (MAP) kinase activator and yeast PBS2, STE7, and byr1. Our genetic results demonstrate the connection between raf and the highly conserved protein kinase cascade involving MAP kinase in vivo.
Collapse
Affiliation(s)
- L Tsuda
- Laboratory of Experimental Radiology, Aichi Cancer Center Research Institute, Nagoya, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Muir CK, Lim YM. Adrenoceptor study of guinea-pig superior mesenteric--portal vein. Med J Malaysia 1980; 34:387-90. [PMID: 7219269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|