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Zhang J, Kang T, Zhao K, Wei M, Liu L. The relationship between life satisfaction and nostalgia: Perceived social support and meaning in life chain mediation. Acta Psychol (Amst) 2024; 243:104154. [PMID: 38266579 DOI: 10.1016/j.actpsy.2024.104154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 01/16/2024] [Accepted: 01/17/2024] [Indexed: 01/26/2024] Open
Abstract
Much of the previous research has used experimental studies to explore the positive predictive effect of nostalgia on life satisfaction. However, the possible mediating effects involved remain unclear. To analyze the chain mediating mechanism between perceived social support and meaning in life in the relationship between nostalgia and life satisfaction and to improve the positive application of nostalgia to life satisfaction to ensure the physical and mental health of individuals, this study adopted the method of questionnaire survey, applied the Southampton Nostalgia scale, Perceived Social Support scale, Meaning in Life Scale and Life Satisfaction Scale. This study conducted a horizontal survey on 452 subjects recruited online from Gansu Province, Guangdong Province, Qinghai Province, and other places in China. The results showed that (1) there was a significant positive correlation between nostalgia and perceived social support, presence of meaning in life, searching for meaning in life, and life satisfaction. (2) Perceived social support and meaning in life play a chain mediating role in the relationship between nostalgia and life satisfaction. (3) Perceived social support and different dimensions of meaning in life are different in the relationship between nostalgia and life satisfaction. The findings contribute to understanding the chain-mediated mechanism between life satisfaction and nostalgia and provide recommendations for psychological service providers to apply nostalgia to enhance individual life satisfaction.
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Affiliation(s)
- Jianhong Zhang
- School of Psychology, Northwest Normal University, Lanzhou 730070, Gansu, China
| | - Tinghu Kang
- School of Psychology, Northwest Normal University, Lanzhou 730070, Gansu, China.
| | - Kun Zhao
- School of Psychology, Northwest Normal University, Lanzhou 730070, Gansu, China
| | - Min Wei
- School of Psychology, Northwest Normal University, Lanzhou 730070, Gansu, China
| | - Longtian Liu
- School of Psychology, Northwest Normal University, Lanzhou 730070, Gansu, China
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Ogunmuyiwa J, Niño I, Kang T, Shechtman KR, Balogun OD, Ashamalla H. Increasing Accrual of Racial and Ethnic Minorities in Breast Cancer Clinical Trials by Partnering with Community Hospitals. Int J Radiat Oncol Biol Phys 2023; 117:e45. [PMID: 37785448 DOI: 10.1016/j.ijrobp.2023.06.746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Clinical trials provide the highest level of evidence in evaluating the safety and efficacy of new radiation approaches for breast cancer. However, there is a significant lack of racial and ethnic diversity among participants who are enrolled. This discrepancy in research inclusion leads to limitations in applying clinical data, therapeutic indices, technique safety, and toxicity to a diverse patient population. A community-based approach, such as the inclusion of community hospitals in trial enrollment, has been shown to boost participation within these underserved populations. The aim of this study was to evaluate the rate of enrollment of racial and ethnic minorities in breast cancer clinical trials with the inclusion of community hospitals within an NYC hospital system. MATERIALS/METHODS Trial enrollment of breast cancer patients at 3 hospitals was retrospectively assessed. Patient demographics, including age, race, and ethnicity, were compared by enrollment setting. Eligible trials included prospective, randomized clinical trials assessing breast cancer irradiation. Participating hospitals included an academic hospital in Manhattan (MH), and 2 community hospitals in Brooklyn (BH) and Queens (QH). Collectively, these hospitals have a catchment area of 6.2 million, of which 35.2% are White, 19.7% are Asian, 18.3% are Black/African American (B/AA), and 21.2% are Hispanic/Latino (H/L). There is a wide demographic variety within this catchment area. BH serves neighborhoods with a B/AA population as high as 85% and QH serves neighborhoods with an Asian population as high as 54%. RESULTS From January to December 2022, 146 patients were enrolled in 4 breast cancer trials opened at MH (59.6%, n = 87), BH (28.8%, n = 42), and QH (11.6%, n = 17). The average age was 63.3 (SD = 12.1). Of all patients enrolled, 52.7% identified as White, 23.2% as B/AA, 13% as Asian, and 8.9% as H/L. Of the patients enrolled at MH, 64.4% identified as White, 12.6% as B/AA, 8% as Asian, and 8% as H/L. At BH, 50% identified as B/AA, 38% as White, 4.7% as Asian, and 11.9% as H/L. At QH, 58.8% identified as Asian, 29.4% as White, and 11.8% as B/AA. B/AA (OR = 4.41, 95% CI, 1.94-10.03; p<.01) and Asian (OR = 2.92, 95% CI, 1.07-7.93; p<.05) patients were more likely to be enrolled at a community hospital when compared to an academic hospital. There was no difference in enrollment rates between campuses for H/L patients (OR = 1.29, 95% CI, 0.41-4.06; p = .66). CONCLUSION Enrollment of participants from underrepresented racial and ethnic populations in clinical trials is critical to ensuring health equity. These findings suggest partnerships with community hospitals located in underserved populations can be a strategy to improve diversity among clinical trial participants. As it is well-documented that community hospitals can deliver high quality research with similar trial metrics to larger, academic hospitals, partnerships with community hospitals are a feasible way to reduce disparities in breast cancer research.
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Affiliation(s)
- J Ogunmuyiwa
- New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, NY
| | - I Niño
- New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, NY
| | - T Kang
- New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, NY
| | - K R Shechtman
- New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, NY
| | - O D Balogun
- New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, NY; Department of Radiation Oncology, Weill Cornell Medicine, New York, NY
| | - H Ashamalla
- New York Presbyterian Brooklyn Methodist Hospital, Brooklyn, NY
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Kang T, Tang T, Zhang P, Luo S, Qi H. Metacognitive prompts and numerical ordinality in solving word problems: An eye-tracking study. Br J Educ Psychol 2023; 93:862-877. [PMID: 37032438 DOI: 10.1111/bjep.12601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 02/08/2023] [Accepted: 02/08/2023] [Indexed: 04/11/2023]
Abstract
BACKGROUND The ability to translate concrete manipulatives into abstract mathematical formulas can aid in the solving of mathematical word problems among students, and metacognitive prompts play a significant role in enhancing this process. AIMS Based on the concept of semantic congruence, we explored the effects of metacognitive prompts and numerical ordinality on information searching and cognitive processing, throughout the process of solving mathematical word problems among primary school students in China. SAMPLE Participants included 73 primary school students (38 boys and 35 girls) with normal or corrected visual acuity. METHODS This study was based on a 2 (prompt information: no-prompt, metacognitive-prompt) × 2 (number attribute: cardinal number, ordinal number) mixed experimental design. We analysed multiple eye-movement indices, such as fixation duration, saccadic amplitude, and pupil size, since they pertained to the areas of interest. RESULTS When solving both types of problems, pupil sizes were significantly smaller under the metacognitive-prompt condition compared with the no-prompt condition, and shorter dwell time for specific sentences, conditional on metacognitive prompts, indicated the optimization of the presented algorithm. Additionally, the levels of fixation durations and saccadic amplitudes were significantly higher when solving ordinal number word problems compared with solving ordinal number problems, indicating that primary school students were less efficient in reading and faced increased levels of difficulty when solving ordinal number problems. CONCLUSIONS The results indicate that for Chinese upper-grade primary school students, cognitive load was lower in the metacognitive prompting condition and when solving cardinal problems, and higher when solving ordinal problems.
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Affiliation(s)
- Tinghu Kang
- School of Psychology, Northwest Normal University, Lanzhou City, China
| | - Tinghao Tang
- School of Psychology, Northwest Normal University, Lanzhou City, China
| | - Peizhi Zhang
- School of Psychology, Northwest Normal University, Lanzhou City, China
| | - Shu Luo
- School of Psychology, Northwest Normal University, Lanzhou City, China
| | - Huanhuan Qi
- School of Psychology, Northwest Normal University, Lanzhou City, China
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Kang T, Luo S, Wang P, Tang T. Influence of figure information on attention distribution in Chinese landscape painting. Heliyon 2023; 9:e15036. [PMID: 37082642 PMCID: PMC10112017 DOI: 10.1016/j.heliyon.2023.e15036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 03/21/2023] [Accepted: 03/24/2023] [Indexed: 04/03/2023] Open
Abstract
Chinese landscape painting is a complex form of visual art. More researchers pay more attention to the creation process and expressed intention of landscape painting. However, the appreciation of works of visual art is often related to cognitive processing, and it is influenced by the content of the works. This study hypothesized that the information of the figure in landscape paintings could guide the allocation of attention and affect cognitive processing. To test this hypothesis, the vertical landscape paintings of the Song and Ming Dynasties were used as experimental materials in the experiment, and the eye-movement technology was applied to record and compare the differences of the eye-movement indexes of landscape paintings with and without figures. The results showed that the dwell time of landscape painting with figure was significantly longer than that of landscape painting without figure, and the dwell time of the interest area of the figure was significantly longer than that of the interest area without figure. However, the first three fixation duration of the interest area with figures is significantly less than that of the interest area without figure, and there was no difference in the saccade counts and the distribution of fixation points between different landscape paintings. It suggested that the figure in the landscape painting can attract peoples' attention, but it does not have attention priority. Meanwhile, peoples tend to holistic processing when they viewing the vertical landscape paintings, and it is not influenced by the information of figure.
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Kang T, Li Y, Guo J, Ma X, Akhter Hiramoni F, Zahir Ahmed M, C. Jobe M, Ahmed O. The Relationship between College Graduate’s Dual Self-Consciousness and Job Search Clarity: The Mediating Role of Perceived Stress. International Journal of Mental Health Promotion 2022. [DOI: 10.32604/ijmhp.2022.019745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kim HJ, Lee HS, Kazmi SZ, Hann HJ, Kang T, Cha J, Choi S, Swan H, Kim H, Lee YS, Ahn HS. Familial risk for endometriosis and its interaction with smoking, age at menarche and body mass index: a population-based cohort study among siblings. BJOG 2021; 128:1938-1948. [PMID: 34028167 DOI: 10.1111/1471-0528.16769] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 04/10/2021] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To quantify familial risk of endometriosis among full siblings and examine interactions between family history and smoking, age at menarche or body mass index (BMI). DESIGN, SETTING AND POPULATION Population-based nationwide cohort study. METHODS Using data from the Korean National Health Insurance and Screening Programme databases on kinship, healthcare utilisation, lifestyle and anthropometrics, we identified 2 109 288 women with full siblings and their environmental risk factors from 2002 to 2018. Familial risks were estimated using Cox proportional-hazards models, represented as incidence risk ratios (IRR) with 95% CI. Interaction between family history and smoking, age at menarche or BMI were assessed on an additive scale. MAIN OUTCOME MEASURES IRR of endometriosis among women with and without affected siblings. RESULTS From 19 195 women with affected siblings, 1126 developed endometriosis with an incidence of 35.45/10 000 person-years. Familial risk of endometriosis with versus without affected siblings was increased to IRR 2.75 (95% CI 2.25-3.36), and the highest risk was with affected twins (IRR 6.98; 95% CI 4.19-11.62). Women with both a family history and either smoking, early menarche or low BMI had a significantly higher risk of endometriosis compared with the general population and can be regarded as a high-risk group, the IRRs were 4.28 (95% CI 2.43-7.55), 3.47 (95% CI 2.82-4.26) and 3.09 (95% CI 2.68-3.56), respectively. Substantial effect modification of the associations was noted by smoking and early menarche, as their combined risk with family history exceeded the sum of their individual risks, which was also statistically significant. CONCLUSION Genetic factors are the primary contributor to the familial aggregation of endometriosis. Significant gene-environment interaction exists between family history and smoking or early menarche.
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Affiliation(s)
- H J Kim
- Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea
| | - H-S Lee
- Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea
| | - S Z Kazmi
- Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea
| | - H J Hann
- Medical Research Institute, College of Medicine, Ewha Womans University, Seoul, Korea
| | - T Kang
- Health and Wellness College, Sungshin Women's University, Seoul, Korea
| | - J Cha
- Department of Public Health, Korea University, Seoul, Korea
| | - S Choi
- Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea
| | - H Swan
- Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea
| | - H Kim
- Department of Obstetrics and Gynaecology, Seoul National University Hospital, Seoul, Korea
| | - Y S Lee
- Department of Health Informatics and Management, College of Medicine, Chungbuk National University, Cheongju, Korea
| | - H S Ahn
- Department of Preventive Medicine, College of Medicine, Korea University, Seoul, Korea
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Kang T, Wang P, Zhang H. Cognitive Style Differences in Attention Distribution Regarding Calligraphic Perception. Psychol Res Behav Manag 2021; 14:251-260. [PMID: 33679143 PMCID: PMC7924436 DOI: 10.2147/prbm.s290649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 01/28/2021] [Indexed: 11/30/2022] Open
Abstract
Purpose Calligraphy is the most unique form of artistic expression in Chinese culture. However, most studies that used calligraphy as a research object only explored its artistic value from an artistic perspective. Thus, we know little about the information processing and influencing factors of calligraphic perception. Thus, we aimed to determine whether there are differences in attention distribution due to cognitive style in the process of calligraphic perception. Methods The calligraphy of Lan Ting Ji Xu, which is known as the first running script in the history of Chinese calligraphy, was selected as the experimental material. The study used eye movement experiments to explore the differences in cognitive styles of attention distribution when perceiving calligraphy, through the analysis of eye movement data of participants. Results The results showed that field-independent participants had more fixation duration, number of fixations, and saccade angle when they perceived calligraphic works than those who were field-dependent. In other words, field-independent individuals spend more attention resources in the perceptual process. In addition, through data analysis, it was found that fixation duration, number of fixations, and saccade angle in the middle position of calligraphy are larger than the data on both sides of the calligraphy. In other words, when individuals perceive calligraphy, the content in the middle position can attract more attention resources than those on both sides. Conclusion We found that individuals with different cognitive styles have differences in attention distribution in the process of perceiving calligraphy.
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Affiliation(s)
- Tinghu Kang
- Visual Cognition Laboratory, School of Psychology, Northwest Normal University, Lanzhou City, Gansu Province, People's Republic of China
| | - Ping Wang
- Visual Cognition Laboratory, School of Psychology, Northwest Normal University, Lanzhou City, Gansu Province, People's Republic of China
| | - Hui Zhang
- Visual Cognition Laboratory, School of Psychology, Northwest Normal University, Lanzhou City, Gansu Province, People's Republic of China
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Jung KH, Kim HJ, Park W, Lim MJ, Kang T, Kang MJ, Kim KB, Ahn HS. Incidence, survival, and risk of cardiovascular events in adult inflammatory myopathies in South Korea: a nationwide population-based study. Scand J Rheumatol 2020; 49:323-331. [PMID: 32286141 DOI: 10.1080/03009742.2019.1707281] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Epidemiological studies on inflammatory myopathies (IMs) show widely variable results, and studies on Asians are lacking. Despite emerging interest in the cardiovascular disease (CVD) risk associated with IMs, the prevalence of CVD in IM patients and its impact on mortality remain unclear. We conducted a nationwide, population-based study on the incidence, mortality, and associated major CVD events of IMs in the Republic of Korea over 11 years. METHOD Using the nationwide, population-based National Health Insurance claims database and the Rare Intractable Disease registration programme, we estimated incidence, mortality, and CVD occurrence. Survival was examined using the Kaplan-Meier method. Mortality rate in IMs with CVD was analysed by Cox proportional hazards regression. RESULTS There were 3014 incident cases, 640 of whom died during the study period. The mean annual incidence was 7.16/106. Dermatomyositis (DM) and polymyositis (PM) had 5 year survival rates of 76.8% and 79.3%, respectively. Cardiovascular events occurred in 155 patients and 40.6% of IM patients with CVD died. Acute myocardial infarction in men had the highest risk of any CVD event in both DM [standardized incidence ratio (SIR) 4.2, 95% confidence interval (95% CI) 2.4-7.2] and PM (SIR 3.5, 95% CI 1.8-7.0). Haemorrhagic stroke had the highest hazard ratio (HR) in both DM (HR 2.31, 95% CI 1.13-4.70) and PM patients (HR 2.10, 95% CI 1.03-4.27) compared with the general population with CVD. CONCLUSION We found persistently low incidence, poor survival, and high major CVD incidence in IMs, and increased mortality in IMs with CVD.
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Affiliation(s)
- K H Jung
- Division of Rheumatology, Department of Internal Medicine, College of Medicine, Inha University , Incheon, Republic of Korea
| | - H J Kim
- Department of Preventive Medicine, College of Medicine, Korea University , Seoul, Republic of Korea
| | - W Park
- Division of Rheumatology, Department of Internal Medicine, College of Medicine, Inha University , Incheon, Republic of Korea
| | - M J Lim
- Division of Rheumatology, Department of Internal Medicine, College of Medicine, Inha University , Incheon, Republic of Korea
| | - T Kang
- Health Insurance Policy Research Institute, National Health Institute Service , Wonju, Republic of Korea
| | - M J Kang
- Department of Public Health, Graduate School, Korea University , Seoul, Republic of Korea
| | - K-B Kim
- Department of Public Health, Graduate School, Korea University , Seoul, Republic of Korea
| | - H S Ahn
- Department of Preventive Medicine, College of Medicine, Korea University , Seoul, Republic of Korea
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Abstract
I investigated 484 migrant workers’ bicultural identity integration, social support, and social maladjustment, to shed light on the cultural conflict they experience and determine whether this differs between men and women. Results revealed that men had significantly higher levels
of social support than women did, and women had significantly higher levels of social maladjustment than men did; however, there were no significant gender differences in bicultural identity integration. Furthermore, cultural conflict and social maladjustment were negatively predicted by social
support, whereas cultural conflict mediated the effect of social support on social maladjustment. My findings suggest that positive social support for migrant workers could enhance their bicultural identity integration, promote more effective social adaptation, and help eliminate gender differences
in social maladjustment.
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Affiliation(s)
- Tinghu Kang
- School of Psychology, Northwest Normal University
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Kang T, Qian S, Smith GS, Do C, Heller WT. Small-angle neutron scattering study of a dense microemulsion system formed with an ionic liquid. Soft Matter 2017; 13:7154-7160. [PMID: 28895963 DOI: 10.1039/c7sm01516j] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mixtures of water, octane and 1-octanol with 1-tetradecyl-3-methylimidazolium chloride (C14MIM·Cl), often referred to as a surface active ionic liquid (SAIL), form water-in-oil microemulsions that have potential application as extraction media for various metal ions. Here, we present a structural study by small-angle neutron scattering (SANS) of dense microemulsions formed by surfactant-rich mixtures of these four compounds to understand how the SAIL can be used to tune the structures and properties of the microemulsions. The SANS experiments revealed that the microemulsions formed are composed of two phases, a water-in-oil microemulsion and a bicontinuous microemulsion, which becomes the dominant phase at high surfactant concentration. In this concentration regime, the surfactant film becomes more rigid, having a higher bending modulus that results from the parallel stacking of the imidazolium ring of the SAIL. At lower surfactant concentrations, the molecular packing of the SAIL does not change with the water content of the microemulsion. The results presented here correlate well with previously observed changes in the interaction between the IL cation and metal ions (Y. Tong, L. Han and Y. Yang, Ind. Eng. Chem. Res., 2012, 51, 16438-16443), while the capacity of the microemulsion system for water remains high enough for using the system as an extraction medium.
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Affiliation(s)
- T Kang
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
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Omer T, Mailhot T, Berona K, Swadron S, Kang T. 337 Accuracy of Landmark-Guided Glenohumeral Intra-Articular Injections in Patients With Anterior Shoulder Dislocations. Ann Emerg Med 2017. [DOI: 10.1016/j.annemergmed.2017.07.408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kang T, Berona K, Park E, Fredericks A, Chilstrom M, Mailhot T, Inaba K, Burner E. 355 Reliability of the Abdominal Exam in Blunt Trauma Patients With Altered Mental Status. Ann Emerg Med 2016. [DOI: 10.1016/j.annemergmed.2016.08.372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lee W, Song J, Son JH, Gutierrez MP, Kang T, Kim D, Lee LP. Solar optics-based active panel for solar energy storage and disinfection of greywater. Biomicrofluidics 2016; 10:054120. [PMID: 27822328 PMCID: PMC5085975 DOI: 10.1063/1.4965855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 10/10/2016] [Indexed: 06/02/2023]
Abstract
Smart city and innovative building strategies are becoming increasingly more necessary because advancing a sustainable building system is regarded as a promising solution to overcome the depleting water and energy. However, current sustainable building systems mainly focus on energy saving and miss a holistic integration of water regeneration and energy generation. Here, we present a theoretical study of a solar optics-based active panel (SOAP) that enables both solar energy storage and photothermal disinfection of greywater simultaneously. Solar collector efficiency of energy storage and disinfection rate of greywater have been investigated. Due to the light focusing by microlens, the solar collector efficiency is enhanced from 25% to 65%, compared to that without the microlens. The simulation of greywater sterilization shows that 100% disinfection can be accomplished by our SOAP for different types of bacteria including Escherichia coli. Numerical simulation reveals that our SOAP as a lab-on-a-wall system can resolve the water and energy problem in future sustainable building systems.
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Affiliation(s)
- W Lee
- Department of Mechanical Engineering, Sogang University , 04107 Seoul, South Korea
| | | | - J H Son
- Departments of Bioengineering, Electrical Engineering and Computer Science, and Biophysics Program, University of California , Berkeley, California 94270, USA
| | - M P Gutierrez
- Department of Architecture, University of California , Berkeley, California 94270, USA
| | - T Kang
- Department of Chemical and Biomolecular Engineering, Sogang University , 04107 Seoul, South Korea
| | - D Kim
- Department of Mechanical Engineering, Sogang University , 04107 Seoul, South Korea
| | - L P Lee
- Departments of Bioengineering, Electrical Engineering and Computer Science, and Biophysics Program, University of California , Berkeley, California 94270, USA
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Park JE, Lee HS, Cho HD, Kang T. AB0978 The Association of Power Doppler Signal Grades with The Serum Inflammatory Marker Level. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Lee H, Park J, Park C, Kang T. FRI0242 Value of Ultrasound in Carpal Tunnel Syndrome: Useful Method for Treatment and Therapeutic Response after Steroid Injection. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Huang SY, Huang JJ, Kang T, Diao DF, Duan YZ. Coating NiTi archwires with diamond-like carbon films: reducing fluoride-induced corrosion and improving frictional properties. J Mater Sci Mater Med 2013; 24:2287-92. [PMID: 23793493 DOI: 10.1007/s10856-013-4988-0] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Received: 03/02/2013] [Accepted: 06/14/2013] [Indexed: 05/27/2023]
Abstract
This study aims to coat diamond-like carbon (DLC) films onto nickel-titanium (NiTi) orthodontic archwires. The film protects against fluoride-induced corrosion and will improve orthodontic friction. 'Mirror-confinement-type electron cyclotron resonance plasma sputtering' was utilized to deposit DLC films onto NiTi archwires. The influence of a fluoride-containing environment on the surface topography and the friction force between the brackets and archwires were investigated. The results confirmed the superior nature of the DLC coating, with less surface roughness variation for DLC-coated archwires after immersion in a high fluoride ion environment. Friction tests also showed that applying a DLC coating significantly decreased the fretting wear and the coefficient of friction, both in ambient air and artificial saliva. Thus, DLC coatings are recommended to reduce fluoride-induced corrosion and improve orthodontic friction.
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Affiliation(s)
- S Y Huang
- Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, 145 West Changle Rd., Xi'an, 710032, China
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Bae S, Kim YG, Choi J, Hong J, Lee S, Kang T, Jeon H, Hong K, Kim E, Kwak A, Lee CK, Yoo B, Park YB, Song EY, Kim S. Elevated interleukin-32 expression in granulomatosis with polyangiitis. Rheumatology (Oxford) 2012; 51:1979-88. [DOI: 10.1093/rheumatology/kes163] [Citation(s) in RCA: 16] [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: 12/17/2022] Open
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Dong C, Wu Y, Wang Y, Wang C, Kang T, Rychahou PG, Chi YI, Evers BM, Zhou BP. Interaction with Suv39H1 is critical for Snail-mediated E-cadherin repression in breast cancer. Oncogene 2012; 32:1351-62. [PMID: 22562246 PMCID: PMC3703513 DOI: 10.1038/onc.2012.169] [Citation(s) in RCA: 154] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Expression of E-cadherin, a hallmark of epithelial-mesenchymal transition (EMT), is often lost due to promoter DNA methylation in basal-like breast cancer (BLBC), which contributes to the metastatic advantage of this disease; however, the underlying mechanism remains unclear. Here, we identified that Snail interacted with Suv39H1 (suppressor of variegation 3-9 homolog 1), a major methyltransferase responsible for H3K9me3 that intimately links to DNA methylation. We demonstrated that the SNAG domain of Snail and the SET domain of Suv39H1 were required for their mutual interactions. We found that H3K9me3 and DNA methylation on the E-cadherin promoter were higher in BLBC cell lines. We showed that Snail interacted with Suv39H1 and recruited it to the E-cadherin promoter for transcriptional repression. Knockdown of Suv39H1 restored E-cadherin expression by blocking H3K9me3 and DNA methylation and resulted in the inhibition of cell migration, invasion and metastasis of BLBC. Our study not only reveals a critical mechanism underlying the epigenetic regulation of EMT, but also paves a way for the development of new treatment strategies against this disease.
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Affiliation(s)
- C Dong
- Department of Molecular and Cellular Biochemistry, The University of Kentucky College of Medicine, Lexington, KY, USA
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19
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Alvarez R, Chen C, Hung C, Kang T, Lee S, Wu T. Enhancement of the antigen-specific T cell immune responses and therapeutic antitumor effects generated by therapeutic HPV DNA vaccine by histone deacetylase inhibitor. Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2011.12.335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kang S, Kim S, Kang T, Yoon C, Ko S, Hur M, Lee H, Seol C. 528 Short-term Outcomes of Immediate Breast Reconstruction After Mastectomy Using Implant or Tissue Expander in Patients with Breast Cancer. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70593-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kloepfer K, Vrtis R, Pappas T, Kang T, Lee W, Evans M, Gangnon R, Lemanske R, Gern J. Bacterial Detection In The Fall Is Associated With Increased Viral Respiratory Infections. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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22
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Nguyen D, Alavi MV, Kim KY, Kang T, Scott RT, Noh YH, Lindsey JD, Wissinger B, Ellisman MH, Weinreb RN, Perkins GA, Ju WK. A new vicious cycle involving glutamate excitotoxicity, oxidative stress and mitochondrial dynamics. Cell Death Dis 2011; 2:e240. [PMID: 22158479 PMCID: PMC3252734 DOI: 10.1038/cddis.2011.117] [Citation(s) in RCA: 152] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Glutamate excitotoxicity leads to fragmented mitochondria in neurodegenerative diseases, mediated by nitric oxide and S-nitrosylation of dynamin-related protein 1, a mitochondrial outer membrane fission protein. Optic atrophy gene 1 (OPA1) is an inner membrane protein important for mitochondrial fusion. Autosomal dominant optic atrophy (ADOA), caused by mutations in OPA1, is a neurodegenerative disease affecting mainly retinal ganglion cells (RGCs). Here, we showed that OPA1 deficiency in an ADOA model influences N-methyl-D-aspartate (NMDA) receptor expression, which is involved in glutamate excitotoxicity and oxidative stress. Opa1(enu/+) mice show a slow progressive loss of RGCs, activation of astroglia and microglia, and pronounced mitochondrial fission in optic nerve heads as found by electron tomography. Expression of NMDA receptors (NR1, 2A, and 2B) in the retina of Opa1(enu/+) mice was significantly increased as determined by western blot and immunohistochemistry. Superoxide dismutase 2 (SOD2) expression was significantly decreased, the apoptotic pathway was activated as Bax was increased, and phosphorylated Bad and BcL-xL were decreased. Our results conclusively demonstrate that not only glutamate excitotoxicity and/or oxidative stress alters mitochondrial fission/fusion, but that an imbalance in mitochondrial fission/fusion in turn leads to NMDA receptor upregulation and oxidative stress. Therefore, we propose a new vicious cycle involved in neurodegeneration that includes glutamate excitotoxicity, oxidative stress, and mitochondrial dynamics.
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Affiliation(s)
- D Nguyen
- The Sophie and Arthur Brody Laboratory for Optic Nerve Biology, Hamilton Glaucoma Center, Department of Ophthalmology, University of California San Diego, La Jolla, CA, USA
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Hwang E, Jung S, Kang T, Kwon D, Park K, Ryu S. UP-03.145 T2 Ureteral Tumor and Severe Hydronephrosis: Poor Prognostic Factors in Upper Urinary Tract Transitional Cell Carcinoma. Urology 2011. [DOI: 10.1016/j.urology.2011.07.1234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Song HC, Cho S, Kang T, Hodgkiss WS, Preston JR. Long-range acoustic communication in deep water using a towed array. J Acoust Soc Am 2011; 129:EL71-EL75. [PMID: 21428470 DOI: 10.1121/1.3554707] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In September 2010 a long-range acoustic communication (LRAC10) experiment was carried out in deep water off the Southern California Coast. The experiment involved two mobile components: (1) a source towed slowly at a speed of 2-3 knots at ∼75-m depth and (2) a horizontal line array towed at 3.5 knots at a depth of ∼200 m. Phase-coherent communication sequences were transmitted in the frequency band of 200-300 Hz at various ranges (100-700 km). Initial analysis of the LRAC10 data demonstrates that an information rate of 50 bits/s can be achieved over ∼550-km range using quadrature-phase shift-keying (QPSK) modulation and error-correction coding combined with beamforming.
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Affiliation(s)
- H C Song
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0238, USA.
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25
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Holstein GR, Friedrich VL, Kang T, Kukielka E, Martinelli GP. Direct projections from the caudal vestibular nuclei to the ventrolateral medulla in the rat. Neuroscience 2011; 175:104-17. [PMID: 21163335 PMCID: PMC3029471 DOI: 10.1016/j.neuroscience.2010.12.011] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 11/23/2010] [Accepted: 12/08/2010] [Indexed: 02/07/2023]
Abstract
While the basic pathways mediating vestibulo-ocular, -spinal, and -collic reflexes have been described in detail, little is known about vestibular projections to central autonomic sites. Previous studies have primarily focused on projections from the caudal vestibular region to solitary, vagal and parabrachial nuclei, but have noted a sparse innervation of the ventrolateral medulla. Since a direct pathway from the vestibular nuclei to the rostral ventrolateral medulla would provide a morphological substrate for rapid modifications in blood pressure, heart rate and respiration with changes in posture and locomotion, the present study examined anatomical evidence for this pathway using anterograde and retrograde tract tracing and immunofluorescence detection in brainstem sections of the rat medulla. The results provide anatomical evidence for direct pathways from the caudal vestibular nuclear complex to the rostral and caudal ventrolateral medullary regions. The projections are conveyed by fine and highly varicose axons that ramify bilaterally, with greater terminal densities present ipsilateral to the injection site and more rostrally in the ventrolateral medulla. In the rostral ventrolateral medulla, these processes are highly branched and extremely varicose, primarily directed toward the somata and proximal dendrites of non-catecholaminergic neurons, with minor projections to the distal dendrites of catecholaminergic cells. In the caudal ventrolateral medulla, the axons of vestibular nucleus neurons are more modestly branched with fewer varicosities, and their endings are contiguous with both the perikarya and dendrites of catecholamine-containing neurons. These data suggest that vestibular neurons preferentially target the rostral ventrolateral medulla, and can thereby provide a morphological basis for a short latency vestibulo-sympathetic pathway.
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Affiliation(s)
- G R Holstein
- Department of Neurology, Mount Sinai School of Medicine, New York, NY 10029, USA.
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Xu S, Feng Z, Zhang M, Wu Y, Sang Y, Xu H, Lv X, Hu K, Cao J, Zhang R, Chen L, Liu M, Yun JP, Zeng YX, Kang T. hSSB1 binds and protects p21 from ubiquitin-mediated degradation and positively correlates with p21 in human hepatocellular carcinomas. Oncogene 2011; 30:2219-29. [PMID: 21242961 DOI: 10.1038/onc.2010.596] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Downregulation of hSSB1, a single-stranded DNA-binding protein, causes increased radiosensitivity, defective checkpoint activation and genomic instability. However, the mechanisms of hSSB1 function in these responses remain to be uncovered. Here, we present evidence that hSSB1 directly binds p21 and this interaction may prevent p21 from ubiquitin-mediated degradation. Furthermore, both promotion of the G1/S transition and abrogation of the G2/M checkpoints induced by hSSB1 knockdown are partially dependent on p21. Most importantly, hSSB1 and p21 levels are positively correlated in human hepatocellular carcinomas (HCC), as determined by immunostaining. Therefore, hSSB1 may positively modulate p21 to regulate cell cycle progression and DNA damage response, implicating hSSB1 as a novel, promising therapeutic target for cancers such as HCC.
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Affiliation(s)
- S Xu
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
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Ryu S, Kim S, Hwang E, Im C, Oh K, Jung S, Kang T, Kwon D, Park K. UP-1.26: The role of alpha 1(A) Adrenoceptor antagonist tamsulosin for the treatment of patients with lower urinary tract symptoms in women: the effect of nocturia and sleep quality. Urology 2010. [DOI: 10.1016/j.urology.2010.07.159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Smith SD, Bolwell BJ, Rybicki LA, Kang T, Dean R, Advani A, Thakkar S, Sobecks R, Kalaycio M, Pohlman B, Sweetenham JW. Comparison of outcomes after auto-SCT for patients with relapsed diffuse large B-cell lymphoma according to previous therapy with rituximab. Bone Marrow Transplant 2010; 46:262-6. [DOI: 10.1038/bmt.2010.95] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Huisden CM, Adesogan AT, Gaskin JM, Courtney CH, Raji AM, Kang T. Effect of feeding Mucuna pruriens on helminth parasite infestation in lambs. J Ethnopharmacol 2010; 127:669-673. [PMID: 19969060 DOI: 10.1016/j.jep.2009.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 11/24/2009] [Accepted: 12/01/2009] [Indexed: 05/28/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Mucuna pruriens is a tropical legume anecdotally reputed to have anthelmintic properties. This study was conducted to examine the validity of such claims. AIM OF THE STUDY The aim of this study was to determine if ingestion of Mucuna seeds reduces helminth parasite infestation in lambs. MATERIALS AND METHODS Thirty-six Dorper x Katahdin ram lambs were assigned to three treatments, a cottonseed meal based control diet, a diet in which Mucuna replaced cottonseed meal and the control diet with levamisole (7.5mg/kg body weight) administration. All diets were isonitrogenous and isocaloric. The 12 lambs in each treatment were assigned randomly to 4 pens, each containing 3 lambs. Lambs were trickle infected three times per week by gavage with infectious Haemonchus contortus larvae (2000 larvae/lamb) for 3 weeks. RESULTS Levamisole treatment decreased fecal egg counts by 87% and abomasal worm counts by 83%. Mucuna intake did not statistically affect fecal egg counts or abomasal worm counts, though numerical (P>0.10) reductions of 7.4% and 18.1%, respectively were evident. Anemia indicators, feed intake, and lamb growth were unaffected by treatment. CONCLUSIONS Levamisole reduced the Haemonchus parasite burden in lambs significantly but feeding Mucuna reduced the burden by levels unlikely to eliminate the clinical effects of parasitism.
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Affiliation(s)
- C M Huisden
- Department of Animal Sciences, Institute of Food and Agricultural Science, University of Florida, Gainesville, FL 32611, USA
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Kang T, Ahn M, Johnstone P, Kao C, Ko S, Gardner T. MP-15.06: Enhancement of FCYttk-Armed Prostate-Restricted Replicative Adenovirus Effect with Prodrugs Gancyclovir and 5-FC In Prostate Cancer. Urology 2009. [DOI: 10.1016/j.urology.2009.07.840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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31
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Lee S, Bae Y, Lee J, Kang T. Immediate breast reconstruction with contralateral pectoralis major myomammary flap for breast conserving surgery. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-5157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Abstract #5157
Purpose: The breast reconstruction techniques are mandatory in case of the indication permits for there has been lots of data showing no less survival as far as surgery keeps the principle of cancer surgery. It could be selected by many factors but mainly by breast size, site of tumor. The latissimus dorsi musculocutaneous flap (LDMCF) is one of the most commonly used techniques in early breast cancer patient who has small breast. But, it has difficulties to supply enough tissues to the widely excised tumor site. And especially in case of ptosis patient, reduction mammoplasty only is not enough to get the symmetry of the breast. We suggest a pectoralis major myomammary flap(PMMF) as a useful technique for the patients with ptosis.
 Methods: Seventeen patients with ptosis were treated with breast conserving using PMMF surgery. A quadrantectomy rather than lumpectomy was performed through a planned skin incision, and axillary lymph node dissection was performed according to the sentinel lymph node result. PMMF is harvested carefully without perforating branch injury of internal thoracic artery. And reconstruction was done by the PMMF through the medial tunnel between both breasts.
 Results: Among those of seventeen patients, seroma occurred in two patients and no necrosis was occurred. The cosmetic result showed good in fifteen and excellent in two patients based on four-point scoring system of breast cosmetics.
 Conclusions: After enough quadrantectomy to keep the cancer surgery principles, PMMF was quite useful to supply proper tissues for breast reconstructions, especially for the ptosis patient.
Citation Information: Cancer Res 2009;69(2 Suppl):Abstract nr 5157.
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Affiliation(s)
- S Lee
- 1 General Surgery, Pusan National University Hospital, Pusan, Korea
- 2 General Surgery, Pusan National University Hospital, Pusan, Korea
- 4 General Surgery, Maryknoll General Hospital, Pusan, Korea
| | - Y Bae
- 1 General Surgery, Pusan National University Hospital, Pusan, Korea
- 2 General Surgery, Pusan National University Hospital, Pusan, Korea
- 4 General Surgery, Maryknoll General Hospital, Pusan, Korea
| | - J Lee
- 3 General Surgery, Pusan National University Hospital, Pusan, Korea
- 1 General Surgery, Pusan National University Hospital, Pusan, Korea
- 2 General Surgery, Pusan National University Hospital, Pusan, Korea
- 4 General Surgery, Maryknoll General Hospital, Pusan, Korea
| | - T Kang
- 1 General Surgery, Pusan National University Hospital, Pusan, Korea
- 2 General Surgery, Pusan National University Hospital, Pusan, Korea
- 4 General Surgery, Maryknoll General Hospital, Pusan, Korea
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Affiliation(s)
- K. Oh
- Chung–Ang University, Seoul, Korea
| | - M. Park
- Chung–Ang University, Seoul, Korea
| | - T. Kang
- Seoul National University, Seoul, Korea
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Abstract
2077 Background: High-grade gliomas are generally resistant to modern chemotherapy. In the case of glioblastoma multiforme, median overall survival has been less than 12 months and progression free survival of less than 4 months. For patients with recurrent GBMs, the 6 month progression free survival is 15–20%. The combination of irinotecan and bevacizumab is an active regimen in the treatment of this disease. Herein we report the experiences with this regimen at our institution with the objective of identifying a therapy with a better outcome than historical results. Methods: Single institutional, retrospective review of 27 patients with recurrent or progressive high grade gliomas treated at the Cleveland Clinic Brain Tumor Institute from 7/2005 through 10/2006. Patients had progressed on at least one prior chemotherapy. Patients with prior irinotecan or bevacizumab were excluded. Patients were analyzed on an intention-to-treat basis, and outcomes estimated by the Kaplan-Meier method. Results: The median age of the group was 46 years (range 5–69). The median number of prior therapies was 2 (range 1–10). Twenty of 27 patients have progressed (74%), and 11 of 27 patients have died (41%). Kaplan-Meier estimates for outcomes are summarized in the table . Progression-free survival at 6 months is 46 %, with median of 5.1 months. Overall survival at 6 months is 84%, with median of 12.6 months. In 7 patients, treatment was terminated early prior to progression. Significant toxicities include: one patient who developed hematuria, one patient with deep venous thrombosis and one patient who experienced intracranial hemorrhage. Conclusions: Our experience suggests that the combination of irinotecan and bevacizumab improves the 6-month progression-free survival when compared to historical figures. The rate of severe toxicities is consistent with prior reports and mandates careful selection of patients. Further randomized, phase 3 studies should be done to validate these results. [Table: see text] No significant financial relationships to disclose.
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Affiliation(s)
- T. Kang
- Cleveland Clinic Taussig Cancer Center, Cleveland, OH
| | - T. Jin
- Cleveland Clinic Taussig Cancer Center, Cleveland, OH
| | - D. Peereboom
- Cleveland Clinic Taussig Cancer Center, Cleveland, OH
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Kang T, Nichols P, Skinner E, Groshen S, Valin G, Ye W, Raghavan D. Functional heterogeneity of prostatic intra-epithelial neoplasia: Length of hormonal therapy influences response. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.4648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
4648 Background: Prostatic intraepithelial neoplasia (PIN) is a premalignant lesion of the prostate etiologically linked to prostate cancer. While androgen deprivation therapy (ADT) has been used to reduce prostate cancer, there are controversial data regarding the effect of ADT on PIN. We hypothesized that PIN is a heterogeneous entity with respect to hormone responsiveness, that this may explain aspects of the heterogeneity in the natural history of this disease, and have used the clinical model of ADT followed by radical prostatectomy as a test of this hypothesis. Methods: We performed a retrospective study on a cohort of patients who underwent prostatectomy with biopsy proven prostate cancer. Study patients were those who must have received at least 3 months of ADT at the discretion of their surgeons. Patients from the same cohort who did not undergo ADT were used as controls. Patients were randomly selected from the database and their pathology slides were reviewed by a blinded pathologist looking for presence of PIN with an independent observer. Fisher’s exact test was used to compare the proportions of subjects who had residual PIN in the study group and the control group. Exact logistic regression was used to evaluate the duration of ADT in PIN regression. Results: Eighteen patients initially diagnosed with PIN who did not receive hormonal therapy were identified; 28 patients with PIN who underwent hormonal therapy were also studied. All patients who did not receive hormonal therapy had residual PIN whereas 7 of 28 patients undergoing ADT had no residual PIN (p = 0.043). Evaluation of hormonal therapy between responders and non-responders showed statistically significant association between PIN regression and hormone therapy duration (p < 0.001). However PIN response to ADT was not uniform as 16% of patients with ADT longer than 6 months had residual PIN, suggesting variable sensitivity of PIN to ADT. Conclusions: Our results demonstrate that ADT does cause PIN regression, and that there is heterogeneity in this effect with respect to hormonal duration. We propose for future prospective, multi-centered, randomized trials in which ADT impact on PIN is characterized further. No significant financial relationships to disclose.
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Affiliation(s)
- T. Kang
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
| | - P. Nichols
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
| | - E. Skinner
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
| | - S. Groshen
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
| | - G. Valin
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
| | - W. Ye
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
| | - D. Raghavan
- Cleveland Clinic Foundation, Cleveland, OH; University of Southern California, Los Angeles, CA
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Affiliation(s)
- L. B. Anthony
- LSUHSC New Orleans, New Orleans, LA; Vanderbilt Univ, Nashville, TN
| | - T. Kang
- LSUHSC New Orleans, New Orleans, LA; Vanderbilt Univ, Nashville, TN
| | - Y. Shyr
- LSUHSC New Orleans, New Orleans, LA; Vanderbilt Univ, Nashville, TN
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38
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Abstract
[reaction: see text]. The solution and solid-state photochemistry of a series of aryl 1-phenylcyclopentyl ketones (1) was investigated. While typical Norrish type I products were formed in solution, irradiation of crystals of 1 afforded the novel oxetanes 3 and 4 regiospecifically. The formation of the oxetanes is believed to occur through Norrish type I cleavage and hydrogen abstraction, producing an alkene and an aldehyde, followed by a Paternò-Büchi reaction within the crystal lattice cage.
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Affiliation(s)
- T Kang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vanouver, British Columbia, Canada V6T 1Z1
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Kang T, Yi J, Guo A, Wang X, Overall CM, Jiang W, Elde R, Borregaard N, Pei D. Subcellular distribution and cytokine- and chemokine-regulated secretion of leukolysin/MT6-MMP/MMP-25 in neutrophils. J Biol Chem 2001; 276:21960-8. [PMID: 11282999 DOI: 10.1074/jbc.m007997200] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.3] [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: 01/12/2023] Open
Abstract
Leukolysin, originally isolated from human leukocytes, is the sixth member of the membrane-type matrix metalloproteinase (MT-MMP) subfamily with a potential glycosylphosphatidylinositol (GPI) anchor. To understand its biological functions, we screened subpopulations of leukocytes and localized the expression of leukolysin at the mRNA level to neutrophils. Polyclonal and mono-specific antisera raised against a synthetic peptide from its hinge region recognized a major protein species at 56 kDa and several minor forms between 38 and 45 kDa in neutrophil lysates. In resting neutrophils, leukolysin is distributed among specific granules ( approximately 10%), gelatinase granules ( approximately 40%), secretory vesicles ( approximately 30%), and the plasma membrane ( approximately 20%), a pattern distinct from that of neutrophil MMP-8 and MMP-9. Consistent with its membrane localization and its reported GPI anchor, leukolysin partitions into the detergent phase of Triton X-114 and can be released from intact resting neutrophils by glycosylphosphatidylinositol-specific phospholipase C. Phorbol myristate acetate stimulates neutrophils to discharge 100% of leukolysin from specific and gelatinase granules and approximately 50% from the secretory vesicles and plasma membrane, suggesting that leukolysin can be mobilized by physiological signals to the extracellular milieu as a soluble enzyme. Indeed, interleukin 8, a neutrophil chemoattractant, triggered a release of approximately 85% of cellular leukolysins by a process resistant to a mixture of proteinase inhibitors, including aprotinin, BB-94, pepstatin, and E64. Finally, purified recombinant leukolysin can degrade components of the extracellular matrix. These results not only establish leukolysin as the first neutrophil-specific MT-MMP but also implicate it as a cytokine/chemokine-regulated effector during innate immune responses or tissue injury.
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Affiliation(s)
- T Kang
- Departments of Pharmacology and Neurosciences, University of Minnesota School of Medicine, Minneapolis, Minnesota 55455, USA
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Iida J, Pei D, Kang T, Simpson MA, Herlyn M, Furcht LT, McCarthy JB. Melanoma chondroitin sulfate proteoglycan regulates matrix metalloproteinase-dependent human melanoma invasion into type I collagen. J Biol Chem 2001; 276:18786-94. [PMID: 11278606 DOI: 10.1074/jbc.m010053200] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tumor cell adhesion and proteolysis of the extracellular matrix proteins surrounding the cells are tightly linked processes in tumor invasion. In this study, we sought to identify components of the cell surface of a vertical growth phase melanoma cell line, WM1341D, that mediate invasive cellular behavior. We determined by antisense inhibition that melanoma chondroitin sulfate proteoglycan (MCSP) and membrane-type 3 matrix metalloproteinase (MT3-MMP) expressed on WM1341D are required for invasion of type I collagen and degradation of type I gelatin. MT3-MMP co-immunoprecipitated with MCSP in WM1341D melanoma cells cultured on type I collagen or laminin. The association between MT3-MMP and MCSP was largely disrupted by removing chondroitin sulfate glycosaminoglycan (CS) from the cell surface, suggesting CS could mediate the association between the two cell surface core proteins. Recombinant MT3-MMP and MT3-MMP from whole cell lysates of WM1341D cells were specifically eluted from CS- conjugated affinity columns. The results indicate that MT3-MMP possesses the potential to promote melanoma invasion and proteolysis and that the formation of a complex between MT3-MMP and MCSP may be a crucial step in activating these processes.
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Affiliation(s)
- J Iida
- Department of Laboratory Medicine and Pathology, University of Minnesota Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, USA
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La J, Kim T, Sung T, Kang T, Lee J, Yang I. Involvement of nitric oxide and vasoactive intestinal peptide in the nonadrenergic-noncholinergic relaxation of the porcine retractor penis muscle. Jpn J Pharmacol 2001; 86:236-43. [PMID: 11459127 DOI: 10.1254/jjp.86.236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Neurotransmitters mediating nonadrenergic-noncholinergic (NANC) relaxation were investigated in strips of porcine retractor penis muscle (RPM). Muscle tone was raised by phenylephrine (1 microM) in the presence of atropine (1 microM) and guanethidine (50 microM). Upon electrical field stimulation (1 ms, 80 V, 1-32 Hz for 10 s), the initial fast relaxation was followed by the slow relaxation. Although the fast and the slow relaxation were completely abolished by tetrodotoxin (1 microM), they showed different pharmacological sensitivities to the nitric oxide (NO) synthase inhibitor N(omega)-nitro-L-arginine methyl ester (L-NAME, 0.1 mM). The fast relaxation was markedly inhibited by L-NAME in an L-arginine reversible manner and by oxyhemoglobin (50 microM), while the slow relaxation was hardly blocked by L-NAME. L-NAME and alpha-chymotrypsin (alpha-CT, 3 U/ml) selectively inhibited the fast and the slow relaxation, respectively. Alpha-CT abolished L-NAME-resistant slow relaxation, and L-NAME completely abolished the alpha-CT-resistant fast relaxation. Alpha-CT-resistant relaxation was not significantly different from the digitally calculated L-NAME-sensitive component, and L-NAME-resistant relaxation was similar to the digitally calculated alpha-CT-sensitive component. Vasoactive intestinal peptide (VIP, 0.003-0.1 microM) relaxed porcine RPM in a concentration-dependent manner. The effect of a VIP was partially inhibited by a VIP receptor antagonist, VIP(10-28) (1 and 3 microM). L-NAME-resistant relaxation was also reduced by VIP(10-28) (3 microM) and by another putative antagonist, VIP(6-28) (1 microM), although the effects of the two antagonists were somewhat inconsistent. From the histochemical staining, it was verified that nerve bundles that showed VIP-like immunoreactivities were also positive for the NADPH diaphorase reaction. These results suggest that NO and peptide neurotransmitter(s) including VIP mediate the NANC relaxation in porcine RPM.
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Affiliation(s)
- J La
- Department of Veterinary Physiology, College of Veterinary Medicine, Seoul National University, Suwon, Republic of Korea
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Baek WC, Kang T, Sohn HJ, Kho YT. In situ surface enhanced Raman spectroscopic study on the effect of dissolved oxygen on the corrosion film on low carbon steel in 0.01 M NaCl solution. Electrochim Acta 2001. [DOI: 10.1016/s0013-4686(01)00442-x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Won MH, Kang T, Park S, Jeon G, Kim Y, Seo JH, Choi E, Chung M, Cho SS. The alterations of N-Methyl-D-aspartate receptor expressions and oxidative DNA damage in the CA1 area at the early time after ischemia-reperfusion insult. Neurosci Lett 2001; 301:139-42. [PMID: 11248442 DOI: 10.1016/s0304-3940(01)01625-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [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: 11/15/2022]
Abstract
Delayed neuronal death in the CA1 of the hippocampus following global ischemia has been evoked by both the activation of N-methyl-D-aspartate receptor (NR) and the generate reactive oxygen species in the neurons. In the present study, we investigated whether oxidative DNA damages may be correlated with NR subunits (NR1 and NR2A/B) expression following ischemia insults in vivo. Thirty minutes after ischemia-reperfusion, the intensities of both NR and 8-hydroxy-2'-deoxyguanosine (8-OHdG) immunoreactivities were markedly increased in neurons of CA1. However, NR2A/B and 8-OHdG immunoreactivities were enhanced in CA1 over 24 h after ischemia although NR1 immunoreactivity was decreased. These results suggest that oxidative stress and excitotoxicity in the CA1 may simultaneously trigger neuronal damages at early time after ischemia, and free radical damage including oxidative DNA damage may eventually promote the delayed neuronal death in this region.
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Affiliation(s)
- M H Won
- Department of Anatomy, College of Medicine, Seoul National University, Yongon-Dong, Chongno-Gu, 110-799, Seoul, South Korea
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Kang T, Yi J, Yang W, Wang X, Jiang A, Pei D. Functional characterization of MT3-MMP in transfected MDCK cells: progelatinase A activation and tubulogenesis in 3-D collagen lattice. FASEB J 2000; 14:2559-68. [PMID: 11099475 DOI: 10.1096/fj.00-0269com] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [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: 01/25/2023]
Abstract
MT3-MMP, a membrane-anchored matrix metalloproteinase, has been proposed to participate in the remodeling of extracellular matrix either by direct proteolysis or via activating other enzymes such as progelatinase A. To test this hypothesis, we analyzed the effect of exogenously transfected MT3-MMP in a tissue remodeling system: growth and tubulogenesis of Madin-Darby canine kidney (MDCK) cells in collagen gels. Although the parental cells require MMP activities for both growth and tubulogenesis, over-expression of wild-type MT3-MMP, but not its catalytically inactive mutant, leads to further enhancement of both processes, independent of its downstream substrate, progelatinase A. Mechanistically, MT3-MMP accomplishes such an effect by displaying on cell surfaces as active species, ready to activate progelatinase A or degrade ECM molecules. These data strongly suggest that MT3-MMP possesses the potential to directly enhance the growth and invasiveness of cells in vivo, two critical processes for development and carcinogenesis.
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Affiliation(s)
- T Kang
- Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Kwon HY, Choi SY, Won MH, Kang T, Kang JH. Oxidative modification and inactivation of Cu,Zn-superoxide dismutase by 2,2'-azobis(2-amidinopropane) dihydrochloride. Biochim Biophys Acta 2000; 1543:69-76. [PMID: 11087942 DOI: 10.1016/s0167-4838(00)00197-7] [Citation(s) in RCA: 41] [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] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We have investigated oxidative modification of human Cu, Zn-superoxide dismutase (SOD) by alkylperoxyl radicals and alkylperoxides. To generate free radicals, we used the hydrophilic azocompound, 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH). When Cu,Zn-SOD was incubated with AAPH, the enzyme activity was decreased gradually in a time-dependent manner. The oxidative damage to Cu,Zn-SOD by AAPH-derived radicals led to protein fragmentation which is associated with the inactivation of enzyme. Incubation with AAPH resulted in the release of copper ions from Cu,Zn-SOD and the generation of protein carbonyl derivatives. Catalase did not protect the fragmentation of Cu,Zn-SOD whereas azide, glutathione and a metal chelator, diethylenetriamine pentaacetic acid inhibited the protein fragmentation. When Cu,Zn-SOD that has been exposed to AAPH was subsequently analyzed by amino acid analysis, lysine, histidine, proline, and valine residues were particularly sensitive. It is suggested that oxidative damage of Cu,Zn-SOD by AAPH-derived radicals may induce the perturbation of cellular antioxidant defense systems and subsequently lead to the deleterious condition in cells.
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Affiliation(s)
- H Y Kwon
- Departmernt of Physiology, College of Medicine, Hallym University, Chunchon 200-702, South Korea
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Pei D, Kang T, Qi H. Cysteine array matrix metalloproteinase (CA-MMP)/MMP-23 is a type II transmembrane matrix metalloproteinase regulated by a single cleavage for both secretion and activation. J Biol Chem 2000; 275:33988-97. [PMID: 10945999 DOI: 10.1074/jbc.m006493200] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.0] [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: 11/06/2022] Open
Abstract
Matrix metalloproteinases characterized so far are either secreted or membrane anchored via a type I transmembrane domain or a glycosylphosphatidylinositol linkage. Lacking either membrane-anchoring mechanism, the newly discovered CA-MMP/MMP-23 was reported to be expressed as a cell-associated protein. In this report, we present evidence that CA-MMP is expressed as an integral membrane zymogen with an N-terminal signal anchor, and secreted as a fully processed mature enzyme. We further demonstrate that L(20)GAALSGLCLLSALALL(36) is required for this unique membrane localization as a signal anchor and its secretion is regulated by a proprotein convertase motif RRRR(79) sandwiched between its pro- and catalytic domains. Thus, CA-MMP is a type II transmembrane MMP that can be regulated by a single proteolytic cleavage for both activation and secretion, establishing a novel paradigm for protein trafficking and processing within the secretory pathway.
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Affiliation(s)
- D Pei
- Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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Athmann C, Zeng N, Kang T, Marcus EA, Scott DR, Rektorschek M, Buhmann A, Melchers K, Sachs G. Local pH elevation mediated by the intrabacterial urease of Helicobacter pylori cocultured with gastric cells. J Clin Invest 2000; 106:339-47. [PMID: 10930437 PMCID: PMC314326 DOI: 10.1172/jci9351] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [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: 12/15/2022] Open
Abstract
Helicobacter pylori resists gastric acidity by modulating the proton-gated urea channel UreI, allowing for pH(out)-dependent regulation of urea access to intrabacterial urease. We employed pH- and Ca(2+)-sensitive fluorescent dyes and confocal microscopy to determine the location, rate, and magnitude of pH changes in an H. pylori-AGS cell coculture model, comparing wild-type bacteria with nonpolar ureI-deletion strains (ureI-ve). Addition of urea at pH 5.5 to the coculture resulted first in elevation of bacterial periplasmic pH, followed by an increase of medium pH and then pH in AGS cells. No change in periplasmic pH occurred in ureI-deletion mutants, which also induced a slower increase in the pH of the medium. Pretreatment of the mutant bacteria with the detergent C(12)E(8) before adding urea resulted in rapid elevation of bacterial cytoplasmic pH and medium pH. UreI-dependent NH(3) generation by intrabacterial urease buffers the bacterial periplasm, enabling acid resistance at the low urea concentrations found in gastric juice. Perfusion of AGS cells with urea-containing medium from coculture at pH 5.5 did not elevate pH(in) or [Ca(2+)](in), unless the conditioned medium was first neutralized to elevate the NH(3)/NH(4)(+) ratio. Therefore, cellular effects of intrabacterial ammonia generation under acidic conditions are indirect and not through a type IV secretory complex. The pH(in) and [Ca(2+)](in) elevation that causes the NH(3)/NH(4)(+) ratio to increase after neutralization of infected gastric juice may contribute to the gastritis seen with H. pylori infection.
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Affiliation(s)
- C Athmann
- University of California at Los Angeles and Veterans Administration, Greater Los Angeles Healthcare System, Los Angeles, California, USA
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Zeng N, Athmann C, Kang T, Walsh JH, Sachs G. Role of neuropeptide-sensitive L-type Ca(2+) channels in histamine release in gastric enterochromaffin-like cells. Am J Physiol Gastrointest Liver Physiol 2000; 277:G1268-80. [PMID: 10600825 DOI: 10.1152/ajpgi.1999.277.6.g1268] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Peptides release histamine from enterochromaffin-like (ECL) cells because of elevation of intracellular Ca(2+) concentration ([Ca(2+)](i)) by either receptor-operated or voltage-dependent Ca(2+) channels (VDCC). To determine whether VDCCs contribute to histamine release stimulated by gastrin or pituitary adenylate cyclase-activating polypeptide (PACAP), the presence of VDCCs and their possible modulation by peptides was investigated in a 48-h cultured rat gastric cell population containing 85% ECL cells. Video imaging of fura 2-loaded cells was used to measure [Ca(2+)](i), and histamine was assayed by RIA. Cells were depolarized by increasing extracellular K(+) concentrations or by 20 mM tetraethylammonium (TEA(+)). Cell depolarization increased transient and steady-state [Ca(2+)](i) and resulted in histamine release, dependent on extracellular Ca(2+). These K(+)- or TEA(+)-dependent effects on histamine release from ECL cells were coupled to activation of parietal cells in intact rabbit gastric glands, and L-type channel blockade by 2 microM nifedipine inhibited 50% of [Ca(2+)](i) elevation and histamine release. N-type channel blockade by 1 microM omega-conotoxin GVIA inhibited 25% of [Ca(2+)](i) elevation and 14% of histamine release. Inhibition was additive. The effects of 20 mM TEA(+) were fully inhibited by 2 microM nifedipine. Both classes of Ca(2+) channels were found in ECL cells, but not in parietal cells, by RT-PCR. Nifedipine reduced PACAP-induced (but not gastrin-stimulated) Ca(2+) entry and histamine release by 40%. Somatostatin, peptide YY (PYY), and galanin dose dependently inhibited L-type Ca(2+) channels via a pertussis toxin-sensitive pathway. L-type VDCCs play a role in PACAP but not gastrin stimulation of histamine release from ECL cells, and the channel opening is inhibited by somatostatin, PYY, and galanin by interaction with a G(i) or G(o) protein.
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Affiliation(s)
- N Zeng
- Wadsworth Veterans Affairs Hospital, Los Angeles, California 90073, USA
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Zeng N, Athmann C, Kang T, Lyu RM, Walsh JH, Ohning GV, Sachs G, Pisegna JR. PACAP type I receptor activation regulates ECL cells and gastric acid secretion. J Clin Invest 1999; 104:1383-91. [PMID: 10562300 PMCID: PMC409843 DOI: 10.1172/jci7537] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/1999] [Accepted: 09/17/1999] [Indexed: 11/17/2022] Open
Abstract
Pituitary adenylate cyclase activating polypeptide (PACAP) is present in gastric nerves, and PACAP receptors (PAC1) are found on gastric enterochromaffin-like (ECL) cells. Expression of PAC1 splice variants in purified ECL cells was determined by RT-PCR. PACAP effects on ECL cells were analyzed by video imaging of [Ca(2+)](i) and histamine release; its effects on gastric glands were examined by confocal microscopy of [Ca(2+)](i) in ECL and parietal cells. PACAP action on D cells was measured by [Ca(2+)](i) and radioimmunoassay. PACAP effects on acid secretion were determined in fistula rats with or without neutralizing anti-somatostatin antibodies. All splice variants of PAC1 were found, but vasoactive intestinal polypeptide (VIP) receptor (VPAC) products were absent. PACAP-27 and -38 dose-dependently raise [Ca(2+)](i) in ECL cells, and stimulated histamine release. VIP had a much lower affinity, which demonstrates the presence of PAC1 but not VPAC. PACAP elevated [Ca(2+)](i) in ECL and parietal cells of superfused gastric glands, but only the parietal cell signal was inhibited by ranitidine, showing the absence of PAC1 on parietal cells, and demonstrating functional coupling between the cell types. PACAP and VIP stimulated calcium signaling and somatostatin release from D cells with almost equal efficacy. Acid secretion was stimulated after intravenous injection of PACAP into rats treated with somatostatin antibody. PACAP is a candidate as a mediator of neural regulation of acid secretion.
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Affiliation(s)
- N Zeng
- The Center for Ulcer Research and Education: Veterans Administration/University of California-Los Angeles Digestive Diseases Research Center, Veterans Affairs Greater Los Angeles Heath Care System at West Los Angeles, California 90073, USA
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50
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Wen Y, Edelman JL, Kang T, Sachs G. Lipocortin V may function as a signaling protein for vascular endothelial growth factor receptor-2/Flk-1. Biochem Biophys Res Commun 1999; 258:713-21. [PMID: 10329451 DOI: 10.1006/bbrc.1999.0678] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [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: 11/22/2022]
Abstract
Binding of vascular endothelial growth factor (VEGF) to its receptor, VEGFR-2 (Flk-1/KDR), induces dimerization and activation of the tyrosine kinase domain of the receptor, resulting in autophosphorylation of cytoplasmic tyrosine residues used as docking sites for signaling proteins that relay the signals for cell proliferation, migration, and permeability enhancement. We explored the VEGF/receptor signaling pathway by performing a two-hybrid screen of a rat lung cDNA library in yeast using the intracellular domain of rat VEGFR-2 as bait. Two clones encoding lipocortin V were isolated. Subsequent studies with the yeast two-hybrid assay showed that the complete intracellular domain of VEGFR-2 was required for the interaction. Co-immunoprecipitation of translated proteins confirmed the interaction between the VEGF receptor and lipocortin V. VEGF induced a rapid tyrosine phosphorylation of lipocortin V in human umbilical vein endothelial cells (HUVEC). Pretreatment of HUVEC with antisense oligodeoxyribonucleotide (ODN) for lipocortin V significantly inhibited VEGF-induced cell proliferation, which was accompanied by a decrease in protein synthesis and tyrosine phosphorylation of lipocortin V. Our results indicate that lipocortin V may function as a signaling protein for VEGFR-2 by directly interacting with the intracellular domain of the receptor and appears to be involved in regulation of vascular endothelial cell proliferation mediated by VEGFR-2.
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Affiliation(s)
- Y Wen
- Membrane Biology Laboratory, Department of Medicine, West, Los Angeles VA Medical Center and UCLA, Los Angeles, California, 90073, USA
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