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Yang K, Xu HL, Tang ML, Zeng CH. [Bibliometric and visual analysis of pneumoconiosis based on Cite Space]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2024; 42:34-41. [PMID: 38311947 DOI: 10.3760/cma.j.cn121094-20220630-000350] [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] [Subscribe] [Scholar Register] [Indexed: 02/06/2024]
Abstract
Objective: Through the bibliometrics analysis and visual analysis of Chinese and English literature related to pneumoconiosis through CiteSpace, to understand the research situation, research trend and hotspots of pneumoconiosis, so as to provide reference for further research. Methods: In August 2022, CNKI (China National Knowledge Infrastructure) data baseand Web of Science core collection database were used as data sources for literature retrieval. Cite Space.5.8.R3c software was used to analyze the cooperation between authors and institutions, keyword co-occurrence analysis, keyword clustering analysis and keyword emergence analysis. Results: A total of 4726 Chinese literature and 2490 English literature related to pneumoconiosis were included; The annual publication volume of Chinese literature shows a fluctuating downward trend, while the annual publication volume of English literature shows a fluctuating upward trend. The Institute of Labor Health and Occupational Disease of the Chinese Academy of Preventive Medical Sciences and the Institute of Occupational Health and Poisoning Control of the Chinese Center for Disease Control and Prevention have the highest publication volume (55 articles) in the institutional cooperation network; The National Institute for Occupational Safety and Health (NIOSH) in the United States has the highest publication volume (153 articles) in the institutional collaboration network. The results of keyword co-occurrence, clustering, and prominence analysis show that Chinese literature focuses more on clinical research on pneumoconiosis, while English literature focuses more on experimental research related to the pathogenesis of pneumoconiosis. Conclusion: In the related field of pneumoconiosis research, the experimental research and clinical research on the pathogenesis are the main research hotspots.
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Affiliation(s)
- K Yang
- Faculty of Pharmacy, Guangxi University of Chinese Medicine, Nanning 530200, China
| | - H L Xu
- Faculty of Pharmacy, Guangxi University of Chinese Medicine, Nanning 530200, China
| | - M L Tang
- Faculty of Pharmacy, Guangxi University of Chinese Medicine, Nanning 530200, China
| | - C H Zeng
- Faculty of Pharmacy, Guangxi University of Chinese Medicine, Nanning 530200, China
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Yang JH, Fei XL, Li QL, Xu ZH, Gao K, Bai H, Li JY, Tang ML, Wang JB, Jin MJ, Chen K. [Influence of age on advanced neoplasia detection in colorectal cancer screening in population at high risk]. Zhonghua Liu Xing Bing Xue Za Zhi 2022; 43:1282-1287. [PMID: 35981991 DOI: 10.3760/cma.j.cn112338-20211220-01002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To compare the detection rate of advanced neoplasia and the number of people needing endoscopy in colorectal cancer screening giving at different starting age in population at high risk. Methods: Based on the screening project of early diagnosis and treatment of colorectal cancer in Jiashan county, Zhejiang province, two rounds of colorectal cancer screening were conducted between January 2007 and December 2020. After excluding participants who were not at high risk or had incomplete information, 27 130 participants and 31 205 participants were finally enrolled in round one and in round two, respectively. The spline analysis based on the generalized additive model was used to describe the trend of detection rate of advanced neoplasia with age. The detection rate and number of people needing endoscopy for the groups with starting age at 50, 45 and 40 years were calculated, and the differences in the detection rate were tested by χ2 goodness of fit test. Results: A total of 21 077 (77.69%) participants in round one and 25 249 (80.91%) participants in round two received endoscopy, in whom 1 097 (detection rate=52.05‰) and 1 151 (detection rate=45.59‰) had advanced neoplasia (cancers and advanced adenomas), respectively. The detection rate increased significantly with age, and the detection rate in round one were significantly higher than that in round two (P<0.05). The overall detection rates of advanced neoplasia for the groups with starting age at 50, 45 and 40 years were 61.11‰, 56.14‰ and 52.05‰ in round one, and 49.10‰, 46.75‰ and 45.59‰ in round two, respectively. The rates were significantly higher for the group with starting age at 50 years than that with starting age at 40 years in both round one and round two (P<0.05). The numbers of people needing endoscopy of advanced neoplasia for the groups with starting age at 50, 45 and 40 years were 17, 18, and 20 in round one, and 21, 22 and 22 in round two. Conclusions: The detection rate of advanced neoplasia increased with age. Starting screening at lower age might contribute to decreased detection rate and increased number of people needing endoscopy. However, the difference was limited.
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Affiliation(s)
- J H Yang
- Jiashan Institute of Cancer Prevention and Treatment, Jiaxing 314100, China
| | - X L Fei
- Jiashan Institute of Cancer Prevention and Treatment, Jiaxing 314100, China
| | - Q L Li
- Jiashan Institute of Cancer Prevention and Treatment, Jiaxing 314100, China
| | - Z H Xu
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - K Gao
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - H Bai
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - J Y Li
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - M L Tang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - J B Wang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - M J Jin
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, Cancer Institute, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310000, China
| | - Kun Chen
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, Cancer Institute, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310000, China
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Yang JH, Fei XL, Li QL, Xu ZH, Gao K, Bai H, Li JY, Tang ML, Wang JB, Jin MJ, Chen K. [Influence of age on advanced neoplasia detection in colorectal cancer screening in population at high risk]. Zhonghua Liu Xing Bing Xue Za Zhi 2022. [PMID: 35981991 DOI: 10.3760/cma.j.cn112338-20211220-0100229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Objective: To compare the detection rate of advanced neoplasia and the number of people needing endoscopy in colorectal cancer screening giving at different starting age in population at high risk. Methods: Based on the screening project of early diagnosis and treatment of colorectal cancer in Jiashan county, Zhejiang province, two rounds of colorectal cancer screening were conducted between January 2007 and December 2020. After excluding participants who were not at high risk or had incomplete information, 27 130 participants and 31 205 participants were finally enrolled in round one and in round two, respectively. The spline analysis based on the generalized additive model was used to describe the trend of detection rate of advanced neoplasia with age. The detection rate and number of people needing endoscopy for the groups with starting age at 50, 45 and 40 years were calculated, and the differences in the detection rate were tested by χ2 goodness of fit test. Results: A total of 21 077 (77.69%) participants in round one and 25 249 (80.91%) participants in round two received endoscopy, in whom 1 097 (detection rate=52.05‰) and 1 151 (detection rate=45.59‰) had advanced neoplasia (cancers and advanced adenomas), respectively. The detection rate increased significantly with age, and the detection rate in round one were significantly higher than that in round two (P<0.05). The overall detection rates of advanced neoplasia for the groups with starting age at 50, 45 and 40 years were 61.11‰, 56.14‰ and 52.05‰ in round one, and 49.10‰, 46.75‰ and 45.59‰ in round two, respectively. The rates were significantly higher for the group with starting age at 50 years than that with starting age at 40 years in both round one and round two (P<0.05). The numbers of people needing endoscopy of advanced neoplasia for the groups with starting age at 50, 45 and 40 years were 17, 18, and 20 in round one, and 21, 22 and 22 in round two. Conclusions: The detection rate of advanced neoplasia increased with age. Starting screening at lower age might contribute to decreased detection rate and increased number of people needing endoscopy. However, the difference was limited.
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Affiliation(s)
- J H Yang
- Jiashan Institute of Cancer Prevention and Treatment, Jiaxing 314100, China
| | - X L Fei
- Jiashan Institute of Cancer Prevention and Treatment, Jiaxing 314100, China
| | - Q L Li
- Jiashan Institute of Cancer Prevention and Treatment, Jiaxing 314100, China
| | - Z H Xu
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - K Gao
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - H Bai
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - J Y Li
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - M L Tang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - J B Wang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - M J Jin
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, Cancer Institute, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310000, China
| | - Kun Chen
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China Key Laboratory of Cancer Prevention and Intervention, Ministry of Education, Cancer Institute, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310000, China
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Tang ML, Wei F, Zhang HF, Dai HF, Zhu XQ, Yu ZB, Qian SN, Jin MJ, Wang JB, Chen K. [Association between sleep and prevalence of hypertension in elderly population]. Zhonghua Liu Xing Bing Xue Za Zhi 2021; 42:1188-1193. [PMID: 34814529 DOI: 10.3760/cma.j.cn112338-20200512-00713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Objective: To explore the association between sleep duration, sleep quality and the prevalence of hypertension in the elderly aged 65 years and above. Methods: This study was conducted among the elderly in communities in Yiwu, China from April to July, 2019, and participants were recruited through physical examination in the hospital. Face-to-face interview was performed to obtain basic information. Sleep duration and sleep quality were evaluated by Pittsburgh Sleep Quality Index (PSQI). Associations between sleep duration, sleep quality and hypertension were evaluated by multivariate logistic regression analysis. Results: A total of 3 169 elderly persons, aged ≥65 years old, were included in the study. The overall prevalence of hypertension was 50.8%. The elderly with very poor sleep quality and short sleep duration accounted for 22.4% and 28.5%, respectively. After adjusting for demographic characteristics, socioeconomic status, lifestyle and health status, the OR of hypertension for the elderly with very poor sleep quality was 1.42 (95%CI: 1.12-1.80) compared with those with very good sleep quality. Compared with the elderly with sleep duration of 6-7 h a night, the OR of hypertension for those with sleep duration <6 h was 1.37 (95%CI: 1.15-1.65). As the sleep quality decreased, the risk for hypertension increased. An U-shaped association was found between sleep duration and risk of hypertension. Subgroup analyses showed that this association existed in both men and women, but only significant in the elderly aged <75 years. Conclusion: Poor sleep quality and short sleep duration were associated with risk for hypertension in the elderly.
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Affiliation(s)
- M L Tang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu 322000, China
| | - F Wei
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - H F Zhang
- The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu 322000, China
| | - H F Dai
- The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu 322000, China
| | - X Q Zhu
- The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu 322000, China
| | - Z B Yu
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - S N Qian
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - M J Jin
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - J B Wang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - K Chen
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health/Cancer Institute of the Second Affiliated Hospital, Zhejiang University School of Medicine/National Clinical Research Center for Child Health of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
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You LQ, Gao K, Li QL, Yang JH, Li JY, Zhang XC, Tang ML, Wang JB, Chen K, Jin MJ. [Association between lifestyle-related factors and colorectal adenoma]. Zhonghua Liu Xing Bing Xue Za Zhi 2021; 41:1649-1654. [PMID: 33297621 DOI: 10.3760/cma.j.cn112338-20200414-00572] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the association between lifestyle-related factors and colorectal adenoma. Methods: Based on the Screening Project of Early Diagnosis and Treatment of Colorectal Cancer in Jiashan county Zhejiang province, from August 2012 to March 2018, information gathered through records on questionnaire and colonoscopic diagnosis were collected from participants with positive results during the primary screening stage. According to the findings of colonoscopy, 11 232 controls without any colorectal diseases and 3 895 cases with colorectal adenoma were included in the study. Multivariate logistic regression models were used to analyze the association between lifestyle-related factors and colorectal adenoma. Results: After adjusting for possible confounding factors, results from multivariate logistic regression analysis showed that smoking, alcohol drinking and obesity were positively related to the risk of colorectal adenoma, with ORs (95%CIs) as 1.38 (1.24-1.54), 1.37 (1.24-1.51) and 1.38 (1.20-1.59) respectively. However, regular aspirin intake was negatively related with the risk of colorectal adenoma (OR=0.65, 95%CI: 0.53-0.80). After stratified by sex and age, data showed that the associations between smoking, alcohol drinking and colorectal adenoma were statistically significant in males, and the association between regular aspirin intake and colorectal adenoma was also statistically significant in older participants (aged 60 years and older). Conclusion: Smoking, alcohol drinking, regular aspirin intake and obesity were associated with colorectal adenoma.
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Affiliation(s)
- L Q You
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - K Gao
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - Q L Li
- Jiashan Institute of Cancer Prevention and Treatment of Zhejiang Province, Jiaxing 314100, China
| | - J H Yang
- Jiashan Institute of Cancer Prevention and Treatment of Zhejiang Province, Jiaxing 314100, China
| | - J Y Li
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - X C Zhang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - M L Tang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - J B Wang
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - K Chen
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
| | - M J Jin
- Department of Epidemiology and Biostatistics, Zhejiang University School of Public Health, Hangzhou 310058, China
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Tang ML, Zhou YQ, Song AQ, Wang JL, Wan YP, Xu RY. The Relationship between Body Mass Index and Incident Diabetes Mellitus in Chinese Aged Population: A Cohort Study. J Diabetes Res 2021; 2021:5581349. [PMID: 34485532 PMCID: PMC8410436 DOI: 10.1155/2021/5581349] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 08/03/2021] [Accepted: 08/12/2021] [Indexed: 01/19/2023] Open
Abstract
OBJECTIVES Previous studies reported that overweight older adults had a lower mortality after cardiovascular diseases attack, indicating being thinner might not always be better. However, there is an ongoing debate about what is the optimal range of body mass index (BMI) for the aged population. We aimed to evaluate the value of BMI for the prediction of incident diabetes mellitus (DM) in the Chinese elderly population. METHODS A total number of 6,911 Chinese elderly people (4,110 men and 2,801 women, aged 71 ± 6.0 years) were included in this cohort study. BMI was measured at baseline (Jan 1, 2014, to Dec 31, 2014). All the participants were further classified into six groups: <18.5 kg/m2, 18.5 to <22.5 kg/m2, 22.5 to <25.0 kg/m2, 25.0 to <27.5 kg/m2, 27.5 to <30.0 kg/m2, and ≥30.0 kg/m2. Fasting blood glucose (FBG) and glycated hemoglobin A1c (HbA1c) were annually measured during follow-up (Jan 1, 2015-May 31, 2019). DM was confirmed if either FBG ≥ 7.0 mmol/L or HbA1c ≥ 6.5%. We used the Cox proportional hazard regression model to evaluate the association between BMI and the prediction of incident DM. RESULTS Comparing individuals with a BMI range of 18.5 to <22.5 kg/m2 (reference), the hazard ratio for incident DM was 2.13 (95% CI: 1.54~2.95), 2.14 (95% CI: 1.53~3.00), 3.17 (95% CI: 2.19~4.59), 3.15 (95% CI: 1.94~5.09), and 3.14 (95% CI: 1.94~5.09) for the group with a BMI range of 22.5 to <25.0 kg/m2, 25.0 to <27.5 kg/m2, 27.5 to <30.0 kg/m2, and ≥30.0 kg/m2 after adjusting for baseline age, sex, blood pressure, lipid profiles, and eGFR (P trend < 0.001), after adjusting for the abovementioned confounders. The association tended to be closer in men and young participants, compared with their counterparts. CONCLUSIONS High BMI was associated with a high risk of developing DM in the Chinese aged population. Thus, it is optimal for the aged population to maintain their body weight within a reasonable range to prevent chronic diseases.
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Affiliation(s)
- M. L. Tang
- Department of Clinical Nutrition, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Y. Q. Zhou
- Department of Clinical Nutrition, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - A. Q. Song
- Department of Clinical Nutrition, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - J. L. Wang
- Department of Clinical Nutrition, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Y. P. Wan
- Department of Clinical Nutrition, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - R. Y. Xu
- Department of Clinical Nutrition, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
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Dai HF, Qian SN, Wei F, Jiang ZZ, Zhang SH, Chen K, Tang ML. [Prevalence and influence factors of job burnout among hospital staffs-a cross-sectional study]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2020; 38:594-597. [PMID: 32892587 DOI: 10.3760/cma.j.cn121094-20200107-00019] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the influencing factors of job burnout of medical staff and provide reference for the formulation of intervention measures. Methods: From November to December, 2018, a questionnaire survey was conducted among medical staff in a general hospital by using the research design of the current situation survey. A total of 1193 questionnaires were distributed and 939 questionnaires were returned, with a recovery rate of 78.7%, including 891 valid questionnaires and an effective recovery rate of 94.9%. Social support rating scale (SSRs) was used to evaluate social support, and Maslach Burnout Scale (MBI-GS) was used to evaluate job burnout. Single factor analysis was performed by chi square test and Fisher exact probability method. To explore the influencing factors of job burnout by using disordered multi classification logistic. Results: The average age was (27.47 ± 4.22) years old, female accounted for 71.5% (637/891) . The total physical examination rate of job burnout was 46.6%. The scores of emotional exhaustion, cynicism and decreased sense of achievement were (10.10±3.75) , (6.14±3.43) , (17.91±4.13) respectively. Multiple logistic regression analysis showed that, compared with the non detected job burnout, the young, working for 1-3 years, average sleep ≤6 hours, and poor social support were more likely to have mild job burnout (OR=0.91, 0.40, 2.25, 2.38, P<0.05) ; female, high night shift frequency in the past year, average sleep ≤6 h. Those with poor social support were more likely to have moderate to severe job burnout (OR=1.59, 2.94, 4.01, 2.40, 3.66, P<0.05) . Conclusion: Corresponding measures should be taken to reduce job burnout and improve work efficiency.
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Affiliation(s)
- H F Dai
- Department of Science and Education, the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Jinhua 322000, China
| | - S N Qian
- Department of Epidemiology and Health Statistics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - F Wei
- Department of Epidemiology and Health Statistics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Z Z Jiang
- Department of Science and Education, the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Jinhua 322000, China
| | - S H Zhang
- Department of Science and Education, the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Jinhua 322000, China
| | - K Chen
- Department of Epidemiology and Health Statistics, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - M L Tang
- Department of Epidemiology and Health Statistics, Zhejiang University School of Medicine, Hangzhou 310058, China
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Yu YL, Shao YK, Ding YQ, Lin KZ, Chen B, Zhang HZ, Zhao LN, Wang ZB, Zhang JS, Tang ML, Mei J. Decellularized kidney scaffold-mediated renal regeneration. Biomaterials 2014; 35:6822-8. [PMID: 24855960 DOI: 10.1016/j.biomaterials.2014.04.074] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 04/22/2014] [Indexed: 01/04/2023]
Abstract
Renal regeneration approaches offer great potential for the treatment of chronic kidney disease, but their availability remains limited by the clinical challenges they pose. In the present study, we used continuous detergent perfusion to generate decellularized (DC) rat kidney scaffolds. The scaffolds retained intact vascular trees and overall architecture, along with significant concentrations of various cytokines, but lost all cellular components. To evaluate its potential in renal function recovery, DC scaffold tissue was grafted onto partially nephrectomized rat kidneys. An increase of renal size was found, and regenerated renal parenchyma cells were observed in the repair area containing the grafted scaffold. In addition, the number of nestin-positive renal progenitor cells was markedly higher in scaffold-grafted kidneys compared to controls. Moreover, radionuclide scan analysis showed significant recovery of renal functions at 6 weeks post-implantation. Our results provide further evidence to show that DC kidney scaffolds could be used to promote renal recovery in the treatment of chronic kidney disease.
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Affiliation(s)
- Y L Yu
- Anatomy Department, Wenzhou Medical University, Wenzhou 325035, China; Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China
| | - Y K Shao
- School of the First Clinical Medical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Y Q Ding
- Institute of Neuroscience, Wenzhou Medical University, Wenzhou 325035, China
| | - K Z Lin
- Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China
| | - B Chen
- Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China; Department of Radiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 32000, China
| | - H Z Zhang
- Department of Nuclear Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 32000, China
| | - L N Zhao
- Anatomy Department, Wenzhou Medical University, Wenzhou 325035, China; Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China
| | - Z B Wang
- Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China
| | - J S Zhang
- Anatomy Department, Wenzhou Medical University, Wenzhou 325035, China; Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China
| | - M L Tang
- Anatomy Department, Wenzhou Medical University, Wenzhou 325035, China; Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China
| | - J Mei
- Anatomy Department, Wenzhou Medical University, Wenzhou 325035, China; Institute of Bioscaffold Transplantation and Immunology, Wenzhou Medical University, Wenzhou 325035, China; Institute of Neuroscience, Wenzhou Medical University, Wenzhou 325035, China.
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Chan PS, Ng HKT, Tang ML. Preface. COMMUN STAT-THEOR M 2014. [DOI: 10.1080/03610926.2014.897209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Tang ML, Ching LS, Brito-Mutunayagam S, Revadi G. Fish in throat: An Unusual Foreign Body. Med J Malaysia 2013; 68:469-470. [PMID: 24632915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A 19 year-old man was presented to us in a state of respiratory distress with history of alleged accidentally swallowed the live fish. Flexible nasopharyngolaryngoscope showed a big live fish impacted in the laryngopharynx. Attempts to remove the fish orally were futile as the fish was impacted. We resorted to tracheostomy under local anaesthesia, followed by direct laryngoscopy and removal of the fish under general anaesthesia. The literature review of such rare incidence and approach to such case are discussed.
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Affiliation(s)
- M L Tang
- Sibu Hospital, ENT, Jalan Ulu Oya 5 1/2,, Sibu, Sarawak 96000, Malaysia.
| | - L S Ching
- Sibu Hospital, ENT, Jalan Ulu Oya 5 1/2,, Sibu, Sarawak 96000, Malaysia
| | | | - G Revadi
- Sibu Hospital, ENT, Jalan Ulu Oya 5 1/2,, Sibu, Sarawak 96000, Malaysia
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Licciardi PV, Ververis K, Tang ML, El-Osta A, Karagiannis TC. Immunomodulatory effects of histone deacetylase inhibitors. Curr Mol Med 2013; 13:640-7. [PMID: 23061676 DOI: 10.2174/1566524011313040013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 10/01/2012] [Accepted: 10/03/2012] [Indexed: 11/22/2022]
Abstract
Histone deacetylase inhibitors (HDACi) have emerged as a new generation of anticancer therapeutics. The classical broad-spectrum HDACi typically alter the cell cycle distribution and induce cell death, apoptosis and differentiation in malignant and transformed cells. This provides the basis for the clinical potential of HDACi in cancer therapy. Currently two compounds, suberoylanilide hydroxamic acid (SAHA, Vorinostat, Zolinza™) and depsipeptide (Romidepsin, Istodax™) have been approved for by the US Food and Drug Administration for the treatment of refractory cutaneous T-cell lymphoma. Apart from clinical application in oncology, HDACi have also been investigated as potential therapeutics for various pathologies including those of the central nervous system (such as Huntington's disease and multiple sclerosis), cardiac conditions (particularly hypertrophy), arthritis and malaria. Further, evidence is accumulating for potent immunomodulatory effects of classical HDACi which is the focus of this review. We review the antiinflammatory effects of HDACi and in particular findings implicating regulation of the innate and adaptive immune systems by HDAC enzymes. The recent findings highlighting the immunomodulatory function of HDAC11 which relates to balancing immune activation versus tolerance are also discussed.
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Affiliation(s)
- P V Licciardi
- Allergy and Immune Disorders, Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia
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12
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Tang ML, Lee SC, Phoon MPY. An atypical case of retropharyngeal abscess with long blind tract treated with Ryle's tube drainage. Med J Malaysia 2011; 66:501-503. [PMID: 22390112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A 10 year-old Iban girl presented with severe odynophagia for 4 days and subcutaneous emphysema. Clinically, her neck was tender with crepitus. Lateral neck radiograph showed multiple linear radiolucent shadows at retropharyngeal space. Flexible nasopharyngolaryngoscope revealed a tunnel behind upper oesophagus with slough and there was pooling of saliva at pyriform sinus. Feeding via nasogastric tube was started and empirical treatment for fungal and bacterial infection was commenced. Subsequent computed tomography of neck and thorax showed a 15-long blind tract at subglottic region posterior to oesophagus (prevertebral region), extending to superior mediastinum just before carina at T3/T4 level, represent abscess. Hourly suctioning of the remaining abscess in the blind tract with 10ml-syringe was done.
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Affiliation(s)
- M L Tang
- Department of Otolaryngology-Head and Neck Surgery, Sibu Hospital, Jalan Ulu Oya, Batu 5 1/2, 96000 Sibu, Sarawak.
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13
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Abstract
This paper presents a multiphase fuzzy region competition model that takes into account spatial and frequency information for image segmentation. In the proposed energy functional, each region is represented by a fuzzy membership function and a data fidelity term that measures the conformity of spatial and frequency data within each region to (generalized) gaussian densities whose parameters are determined jointly with the segmentation process. Compared with the classical region competition model, our approach gives soft segmentation results via the fuzzy membership functions, and moreover, the use of frequency data provides additional region information that can improve the overall segmentation result. To efficiently solve the minimization of the energy functional, we adopt an alternate minimization procedure and make use of Chambolle's fast duality projection algorithm. We apply the proposed method to synthetic and natural textures as well as real-world natural images. Experimental results show that our proposed method has very promising segmentation performance compared with the current state-of-the-art approaches.
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Affiliation(s)
- S K Choy
- Department of Mathematics and Statistics, Hang Seng Management College, Shatin, Hong Kong.
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14
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Osborne NJ, Koplin JJ, Martin PE, Gurrin LC, Thiele L, Tang ML, Ponsonby AL, Dharmage SC, Allen KJ. The HealthNuts population-based study of paediatric food allergy: validity, safety and acceptability. Clin Exp Allergy 2011; 40:1516-22. [PMID: 20608942 DOI: 10.1111/j.1365-2222.2010.03562.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND The incidence of hospital admissions for food allergy-related anaphylaxis in Australia has increased, in line with world-wide trends. However, a valid measure of food allergy prevalence and risk factor data from a population-based study is still lacking. OBJECTIVE To describe the study design and methods used to recruit infants from a population for skin prick testing and oral food challenges, and the use of preliminary data to investigate the extent to which the study sample is representative of the target population. METHODS The study sampling frame design comprises 12-month-old infants presenting for routine scheduled vaccination at immunization clinics in Melbourne, Australia. We compared demographic features of participating families to population summary statistics from the Victorian Perinatal census database, and administered a survey to those non-responders who chose not to participate in the study. RESULTS Study design proved acceptable to the community with good uptake (response rate 73.4%), with 2171 participants recruited. Demographic information on the study population mirrored the Victorian population with most the population parameters measured falling within our confidence intervals (CI). Use of a non-responder questionnaire revealed that a higher proportion of infants who declined to participate (non-responders) were already eating and tolerating peanuts, than those agreeing to participate (54.4%; 95% CI 50.8, 58.0 vs. 27.4%; 95% CI 25.5, 29.3 among participants). CONCLUSION A high proportion of individuals approached in a community setting participated in a food allergy study. The study population differed from the eligible sample in relation to family history of allergy and prior consumption and peanut tolerance, providing some insights into the internal validity of the sample. The study exhibited external validity on general demographics to all births in Victoria.
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Affiliation(s)
- N J Osborne
- Gut and Liver, Murdoch Childrens Research Institute, Melbourne, Vic., Australia
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15
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Vuillermin PJ, Ponsonby AL, Saffery R, Tang ML, Ellis JA, Sly P, Holt P. Microbial exposure, interferon gamma gene demethylation in naïve T-cells, and the risk of allergic disease. Allergy 2009; 64:348-53. [PMID: 19210359 DOI: 10.1111/j.1398-9995.2009.01970.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [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: 01/02/2023]
Abstract
The period of immune programming during early life presents a critical window of opportunity for the prevention of allergic diseases. There is mounting evidence that inappropriate immune programming may involve disruption of specific epigenetic modifications (switches) at immune-related genes. This novel area of research has great potential, as epigenetic changes are known to be sensitive to environmental factors and may therefore provide a mechanistic link for the observed association between specific environmental cues, faulty immune development, and the risk of allergic disease. In addition, the dynamic and potentially reversible nature of epigenetic modifications offers potentially novel targets for therapeutic and/or preventative interventions. We review the evidence that (1) failure to up-regulate the interferon gamma (IFNgamma) response during infancy is an important determinant of the risk of allergic disease, (2) expression of the IFNgamma gene in naïve T-cells is regulated by epigenetic mechanisms, and (3) failure to up-regulate IFNgamma gene expression of naïve T-cells associated with low early life microbial exposure. Taken together, these lines of evidence suggest that low microbial exposure during early life increases the risk of allergic disease by reducing demethylation (activation) of the IFNgamma gene of naive T-cells.
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Affiliation(s)
- P J Vuillermin
- Child Health Research Unit, Barwon Health, Geelong, Victoria, Australia
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Tang ML, Liao YJ, Ng HKT. On tests of rate ratio under standard inverse sampling. Comput Methods Programs Biomed 2008; 89:261-268. [PMID: 18164512 DOI: 10.1016/j.cmpb.2007.11.005] [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] [Received: 08/03/2006] [Revised: 05/24/2007] [Accepted: 11/12/2007] [Indexed: 05/25/2023]
Abstract
Inverse sampling suggests one continues to sample subjects until a pre-specified number of rare events of interest is observed. It is generally considered to be more appropriate than the usual binomial sampling when the subjects come sequentially, when the response probability is rare, and when maximum likelihood estimators of some epidemiological measures are undefined under binomial sampling. Reliable but conservative exact conditional procedure for the ratio of the response probabilities of subject without the attribute of interest has been studied. However, such a procedure is inapplicable to the risk ratio (i.e., ratio of the response probabilities of subject with the attribute of interest). In this paper, we investigate various test statistics (namely Wald-type, score and likelihood ratio test statistics) for testing non-unity risk ratio under standard inverse sampling scheme, which suggests one continue to sample until the predetermined number of index subjects with the attributes of interest is observed. Both asymptotic and numerical approximate unconditional methods are considered for P-value calculation. Performance of these test procedures are evaluated under different settings by means of Monte Carlo simulation. In general, the Wald-type test statistic is preferable for its satisfactory and stable performance with approximate unconditional procedures. The methodologies are illustrated with a real example from a heart disease study.
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Affiliation(s)
- M L Tang
- Department of Mathematics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
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20
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Tang ML, Lu SW, Ren JW, Tang JL, Zhou XB, Wu ST. Applied anatomy of the V-shaped fibular osteomyocutaneous flap in reconstruction of the hindfoot. Surg Radiol Anat 2002; 23:215-20. [PMID: 11694964 DOI: 10.1007/s00276-001-0215-7] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
To establish the applied anatomy of the V-shaped fibular osteomyocutaneous flap pedicled on the peroneal vessels, cadaver dissections were made in 60 lower limbs and 40 calcanei were examined to sum up the features of calcaneal biomechanics on the stability of the foot and the blood supply of the fibular osteomyocutaneous flap. There were four anastomoses and large communicating branches between the lower segment of the peroneal artery and the anterior and posterior tibial arteries. The flap was well supplied by a retrograde circulation through these anastomoses. A suitable length of pedicle was 20 cm. In the sagittal section of the calcaneus passing through the center of the articular surface for the cuboid bone, the arrangement of the trabeculae formed a triangular zone. The V-shaped flap corresponds nicely with the calculated lines of stress evoked by the weight of the body. The procedure may provide a new method for hindfoot reconstruction. This flap meets the criteria outlined for composite tissue reconstruction of defects of the extremities and biomechanics of the hindfoot, especially for calcaneal and cuboid defects.
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Affiliation(s)
- M L Tang
- Department of Anatomy, Basic Medical College, Nanhua University, Hengyang, Hunan 421001, PR China.
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21
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Abstract
UNLABELLED The fundamental abnormality in asthma is inflammation of the airways. T-helper 2 (Th2) lymphocytes are the key orchestrators of this inflammation, initiating and propagating inflammation through the release of Th2 cytokines. Interleukins(IL)-4, IL-5 and IL-13. IL-4 and IL-13 promote IgE production by B-cells, mast cell growth and differentiation, and upregulate adhesion molecule expression on vascular endothelium. IL-4 also promotes differentiation of uncommitted Th0 lymphocytes into Th2 lymphocytes. IL-5 promotes differentiation and recruitment of eosinophils and activates them to degranulate within tissues, resulting in damage to the respiratory epithelium. Current treatment of childhood asthma relies predominantly on corticosteroids that have nonspecific anti-inflammatory activity and are associated with potential side-effects. Novel therapies that selectively target the underlying immunopathogenesis hold great promise. Disruption of the Th2 lymphocyte induced allergic inflammatory response represents a novel approach to selectively inhibiting allergic inflammation at its origin. Possible therapeutic interventions include inhibition of Th2 response (CpG oligonucleotides, vaccination, CTLA4Ig fusion protein, IL-12, IL-10), inhibition of IgE (the anti-IgE antibody rhuMAb-E25 omalizumab, which is undergoing clinical trials), inhibition of mediator activity (leukotriene modifiers, which are approved for use in childhood asthma), and targeting Th2 cytokines (soluble IL-4 receptors, IL-5 antibody, IL-13). Other therapeutic approaches targeting downstream events in the allergic inflammatory cascade are also currently under investigation (chemokine receptors CCR3, tryptase inhibitors, and inhibitors of cyclic AMP-specific phosphodiesterase 4). CONCLUSION As we further understand the pathophysiology of asthma, the potential to develop novel treatments increases. This paper addresses current possible new treatments for the future.
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Affiliation(s)
- M L Tang
- Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Parkville, Victoria, Australia
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Lu SW, Tang ML, Pen YB. [Clinical application of the serial flap pedicled with posterior interosseous artery and its recurrent branch]. Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi 2001; 15:330-2. [PMID: 11762214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To explore a new surgical approach to repair skin and soft tissue defect of hands. METHODS Based on the anatomical study of the origin, course, branch, distribution, and anastomosis of the posterior interosseous artery and its recurrent branches in 40 upper limbs of cadavers, the posterior forearm serial flap, pedicled with the posterior interosseous artery and its recurrent branches, was designed and applied clinically in 17 cases to repair the skin and soft tissue defect of hands from August 1998 to July 2000. The size of flaps ranged from 7 cm x 5 cm to 15 cm x 10 cm. All of the cases were followed up for 3 weeks to 6 months. RESULTS The anatomy study showed that the posterior forearm serial flap had long vascular pedicle, suitable thickness and large skin area. The clinical application indicated that the flaps survived in 16 cases. But flap necrosis at the distal end, sized 2 cm x 3 cm, was observed in one case, in which the defect was repaired by delayed skin grafting, CONCLUSION The posterior forearm serial flap pedicled with the posterior interosseous artery and its recurrent branch have the character of avoidance of sacrificing the major arteries of the extremity, longer vascular pedicle, larger area and suitable thickness. The posterior forearm serial flap is a safe and easily manipulated surgical approach to repair the skin and soft tissue defect of the hands, especially of the thumb, palm, and proximal part of the fingers.
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Affiliation(s)
- S W Lu
- Department of Orthopedics, 458th Hospital of PLA, Guangzhou Guangdong, P. R. China 510602
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23
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Abstract
Airway inflammation and airway hyperresponsiveness (AHR) are fundamental features of asthma. Migration of inflammatory cells from the circulation into the lungs is dependent upon adhesion molecule interactions. The cell surface adhesion molecules L-selectin and intercellular adhesion molecule (ICAM)-1 have been demonstrated to mediate leukocyte rolling on inflamed pulmonary endothelium, and ICAM-1 has also been shown to mediate capillary sequestration in inflamed lung. However, their roles in the development of airway inflammation and AHR in asthma have not been directly examined. We have characterised the roles of L-selectin and ICAM-1 in the recruitment of inflammatory cells to the lung and in the development of airway hyperresponsiveness using an ovalbumin (OVA)-induced allergic airway disease model of asthma and adhesion molecule-deficient mice. OVA-sensitized/challenged ICAM-1-deficient mice have dramatically reduced inflammatory influx into the airway/lung and a corresponding attenuation of AHR as compared to wild-type controls. OVA-sensitized/challenged L-selectin-deficient mice demonstrate significantly reduced numbers of CD3(+)lymphocytes and increased numbers of B220(+)lymphocytes in BAL as compared to wild-type mice (P< 0.05). However, other parameters of airway/lung inflammation in OVA-sensitized/challenged L-selectin-deficient mice were equivalent to wild-type control mice. Remarkably, despite a fulminant inflammatory response in the airway/lung, AHR was completely abrogated in OVA-sensitized/challenged L-selectin-deficient mice. These findings suggest a crucial role for ICAM-1 in the development of airway inflammation and AHR in asthma. In contrast, L-selectin plays a more selective role in the development of airway hyperresponsiveness but not allergic inflammation in this animal model of asthma. Thus, L-selectin and ICAM-1 represent potential targets for novel asthma therapies specifically aimed at controlling airway inflammation and/or airway hyperresponsiveness.
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Affiliation(s)
- M L Tang
- Department of Immunology, Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, Australia.
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Fiscus LC, Van Herpen J, Steeber DA, Tedder TF, Tang ML. L-Selectin is required for the development of airway hyperresponsiveness but not airway inflammation in a murine model of asthma. J Allergy Clin Immunol 2001; 107:1019-24. [PMID: 11398079 DOI: 10.1067/mai.2001.114703] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [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: 11/22/2022]
Abstract
BACKGROUND Airway inflammation and airway hyperresponsiveness (AHR) are fundamental features of asthma. Migration of inflammatory cells from the circulation into the lungs is dependent on adhesion molecule interactions. The cell surface adhesion molecule L-selectin has been demonstrated to mediate leukocyte rolling on inflamed and noninflamed pulmonary endothelium. However, its role in the development of airway inflammation and AHR in asthma has not been examined. OBJECTIVE We sought to characterize the role of L-selectin in the recruitment of inflammatory cells to the airway-lung and the development of AHR in a murine model of asthma. METHODS An ovalbumin (OVA)-induced allergic airway disease model of asthma was applied to L-selectin-deficient (LKO) mice and C57BL/6 wild-type (WT) control mice. The development of airway inflammation was assessed by examining leukocyte influx into bronchoalveolar lavage (BAL) fluid and the lung. Total and differential BAL leukocyte counts were determined, and the immunophenotype of BAL lymphocytes was assessed by means of flow cytometry. The development of AHR was assessed by means of whole-body plethysmography. RESULTS Airway-lung inflammation was equivalent in LKO and WT mice sensitized-challenged with OVA, as measured by total and differential BAL cell counts and histologic analysis of lung tissue. Numbers of eosinophils, neutrophils, lymphocytes, and monocytes in BAL fluid were equivalent in LKO and WT mice. However, phenotypic analysis of BAL lymphocytes demonstrated significantly reduced CD3(+) populations and increased B220(+) populations in LKO compared with WT mice (P <.05). Remarkably, despite a fulminant inflammatory response in the airway-lung in LKO mice sensitized-challenged with OVA, AHR was completely abrogated. CONCLUSION L-selectin plays a crucial role in the development of AHR but not allergic inflammation in an animal model of asthma. L-selectin represents a potential target for novel asthma therapies specifically aimed at controlling AHR.
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Affiliation(s)
- L C Fiscus
- University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA
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Keramidaris E, Merson TD, Steeber DA, Tedder TF, Tang ML. L-selectin and intercellular adhesion molecule 1 mediate lymphocyte migration to the inflamed airway/lung during an allergic inflammatory response in an animal model of asthma. J Allergy Clin Immunol 2001; 107:734-8. [PMID: 11295667 DOI: 10.1067/mai.2001.114050] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
T lymphocytes play a critical role in the development of allergic inflammation in asthma. Early in the allergic response, T lymphocytes migrate from the circulation into the lung to initiate and propagate airway inflammation. The adhesion molecules that mediate lymphocyte entry into inflamed lung have not been defined. This study directly examined the roles of L-selectin and intercellular adhesion molecule 1 (ICAM-1) in lymphocyte migration to the lung during an allergic inflammatory response in an animal model of asthma. Short-term (1 hour) in vivo migration assays and various combinations of adhesion molecule-deficient and wild-type mice were used. Migration of in vivo activated lymphocytes into inflamed lung was significantly greater than entry of resting lymphocytes into noninflamed lung (24.5% +/- 2.7% vs 9.5% +/- 1.3%, P =.001). Migration of activated lymphocytes into inflamed lung was inhibited by 30% in the absence of L-selectin (17.3% +/- 1.3%, P =.04), 47% in the absence of cell surface ICAM-1 (13.0% +/- 2.5%, P =.01), and 47% in the absence of endothelial ICAM-1 (13.0% +/- 2.5%, P =.01). Loss of ICAM-1 on both lymphocytes and lung endothelium inhibited lymphocyte migration by 60% (9.8% +/- 1.8%, P =.002). These findings demonstrate clear roles for both L-selectin and ICAM-1 in lymphocyte migration to the lung during an allergic inflammatory response, with ICAM-1 playing a greater role.
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Affiliation(s)
- E Keramidaris
- Department of Immunology, Royal Children's Hospital, Flemington Rd., Parkville, VIC 3052, Australia
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Steeber DA, Tang ML, Green NE, Zhang XQ, Sloane JE, Tedder TF. Leukocyte entry into sites of inflammation requires overlapping interactions between the L-selectin and ICAM-1 pathways. J Immunol 1999; 163:2176-86. [PMID: 10438959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Leukocyte interactions with vascular endothelium during inflammation depend on cascades of adhesion molecule engagement, particularly during selectin-mediated leukocyte rolling. Leukocyte rolling is also facilitated by members of the integrin and Ig families. Specifically, leukocyte rolling velocities during inflammation are significantly increased in ICAM-1-deficient mice, with ICAM-1 expression required for optimal P- and L-selectin-mediated rolling. Elimination of ICAM-1 expression in L-selectin-deficient mice significantly reduces leukocyte rolling. Whether disrupted leukocyte rolling in L-selectin and ICAM-1 double-deficient (L-selectin/ICAM-1-/-) mice affects leukocyte entry into sites of inflammation in vivo was assessed in the current study by using experimental models of inflammation; thioglycollate-induced peritonitis, chemokine-induced neutrophil migration to the skin, delayed-type hypersensitivity responses, rejection of allogeneic skin grafts, and septic shock. In many cases, the loss of both L-selectin and ICAM-1 expression dramatically reduced leukocyte migration into sites of inflammation beyond what was observed with loss of either receptor alone. In fact, the effects from loss of both L-selectin and ICAM-1 effectively eliminated multiple chronic inflammatory responses in L-selectin/ICAM-1-/- mice. By contrast, the combined loss of L-selectin and ICAM-1 expression had minimal effects on the generation of Ag-specific T cell responses or humoral immunity. Thus, members of the selectin and Ig families function synergistically to mediate optimal leukocyte rolling and entry into tissues, which is essential for the generation of effective inflammatory responses in vivo.
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MESH Headings
- Animals
- Cell Movement/genetics
- Cell Movement/immunology
- Dermatitis, Contact/genetics
- Dermatitis, Contact/immunology
- Dermatitis, Contact/pathology
- Graft Rejection/genetics
- Graft Rejection/immunology
- Graft Rejection/pathology
- Immunity, Innate/genetics
- Immunoglobulin G/biosynthesis
- Immunoglobulin M/biosynthesis
- Injections, Intradermal
- Injections, Intraperitoneal
- Intercellular Adhesion Molecule-1/genetics
- Intercellular Adhesion Molecule-1/physiology
- Interleukin-8/administration & dosage
- L-Selectin/genetics
- L-Selectin/physiology
- Lymphocyte Activation/genetics
- Lymphocytes/immunology
- Lymphocytes/pathology
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Knockout
- Peritonitis/chemically induced
- Peritonitis/genetics
- Peritonitis/immunology
- Peritonitis/pathology
- Shock, Septic/genetics
- Shock, Septic/immunology
- Signal Transduction/genetics
- Signal Transduction/immunology
- Skin Transplantation/immunology
- Skin Transplantation/pathology
- T-Lymphocytes/immunology
- Thioglycolates/toxicity
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Affiliation(s)
- D A Steeber
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.
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Steeber DA, Tang ML, Zhang XQ, Müller W, Wagner N, Tedder TF. Efficient lymphocyte migration across high endothelial venules of mouse Peyer's patches requires overlapping expression of L-selectin and beta7 integrin. J Immunol 1998; 161:6638-47. [PMID: 9862692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Lymphocyte migration into lymphoid organs is regulated by adhesion molecules including L-selectin and the beta7 integrins. L-selectin and alpha4beta7 are predominantly hypothesized to direct the selective migration of lymphocytes to peripheral lymph nodes and the gut-associated lymphoid tissues, respectively. To further characterize interactions between L-selectin and beta7 integrins during lymphocyte recirculation, mice deficient in both receptors (L-selectin/beta7 integrin-/-) were generated. The simultaneous loss of L-selectin and beta7 integrin expression prevented the majority of lymphocytes (>95% inhibition) from attaching to high endothelial venules (HEV) of Peyer's patches and other lymphoid tissues during in vitro binding assays. Moreover, the inability to bind HEV eliminated the vast majority of L-selectin/beta7 integrin-/- lymphocyte migration into Peyer's patches during short-term and long-term in vivo migration assays (>99% inhibition,p < 0.01). The lack of lymphocyte migration into Peyer's patches correlated directly with the dramatically reduced size and cellularity (99% reduced) of this tissue in L-selectin/beta7 integrin-/- mice. High numbers of injected L-selectin/beta7 integrin-/- lymphocytes remaining in the blood of wild-type mice correlated with markedly increased numbers of circulating lymphocytes in L-selectin/beta7 integrin-/- mice. Loss of either L-selectin or the beta7 integrins alone resulted in significant but incomplete inhibition of Peyer's patch migration. Collectively, the phenotype of L-selectin/beta7 integrin-/- mice demonstrates that these two receptors primarily interact along the same adhesion pathway that is required for the vast majority of lymphocyte migration into Peyer's patches.
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Affiliation(s)
- D A Steeber
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.
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Abstract
L-selectin binding activity for its ligand expressed by vascular endothelium is rapidly and transiently increased after leukocyte activation. To identify mechanisms for upregulation and assess how this influences leukocyte/endothelial cell interactions, cell-surface dimers of L-selectin were induced using the coumermycin-GyrB dimerization strategy for cross-linking L-selectin cytoplasmic domains in L-selectin cDNA-transfected lymphoblastoid cells. Coumermycin- induced L-selectin dimerization resulted in an approximately fourfold increase in binding of phosphomanan monoester core complex (PPME), a natural mimic of an L-selectin ligand, comparable to that observed after leukocyte activation. Moreover, L-selectin dimerization significantly increased (by approximately 700%) the number of lymphocytes rolling on vascular endothelium under a broad range of physiological shear stresses, and significantly slowed their rolling velocities. Therefore, L-selectin dimerization may explain the rapid increase in ligand binding activity that occurs after leukocyte activation and may directly influence leukocyte migration to peripheral lymphoid tissues or to sites of inflammation. Inducible oligomerization may also be a common mechanism for rapidly upregulating the adhesive or ligand-binding function of other cell-surface receptors.
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Affiliation(s)
- X Li
- Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Tang ML, Steeber DA, Zhang XQ, Tedder TF. Intrinsic differences in L-selectin expression levels affect T and B lymphocyte subset-specific recirculation pathways. J Immunol 1998; 160:5113-21. [PMID: 9590263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Lymphocyte migration into lymphoid organs is regulated by tissue-specific adhesion molecules such as L-selectin and the alpha4beta7 integrin. Whether L-selectin also regulates lymphocyte subset-specific migration into specific lymphoid tissues was examined in this study by comparing the migration of CD4+ T cells, CD8+ T cells, and B cells from L-selectin-deficient and wild-type mice. T cells were the predominant lymphocyte subset entering PLN, MLN, Peyer's patches, and spleen during short term (1-h) migration assays. However, both B cell and CD4+ and CD8+ T cell entries into PLN, MLN, and Peyer's patches were dramatically impaired (73-98%) by loss of L-selectin. Lymphocyte expression of alpha4beta7 integrin did not compensate for the loss of L-selectin, since both B and T cells predominantly migrated into the spleen in the absence of L-selectin. The more efficient migration of T cells into peripheral lymphoid tissues relative to that of B cells was partly explained by the finding that T cells expressed L-selectin at 50 to 100% higher levels than B cells. In addition, a 50% reduction in L-selectin expression by lymphocytes from hemizygous L-selectin(+/-) mice resulted in a 50 to 70% decrease in short term lymphocyte migration into peripheral lymphoid tissues relative to that of wild-type lymphocytes. Thus, the differential migration of T and B lymphocyte subsets to lymphoid tissues is regulated in part by subset-specific differences in L-selectin expression levels.
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Affiliation(s)
- M L Tang
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
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30
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Abstract
We report six episodes of pneumatosis intestinale (PI) in children with primary combined immunodeficiency. PI was generally benign and responded to conservative therapy. Increased risk of infection or disruption of gastrointestinal mucosa are probable predisposing factors. A diagnosis of PI should be considered in children with primary combined immunodeficiency who experience otherwise unexplained gastrointestinal symptoms, particularly in the early post-transplant period.
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Affiliation(s)
- M L Tang
- Department of Pediatrics, Duke University Medical Center, Durham, North Carolina 27710, USA
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31
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Abstract
We study an estimation procedure for maximum likelihood estimation in covariance structure analysis with truncated data, and obtain the statistical properties of the estimator as well as a test of the model structure. Truncated data with and without knowledge about the number of unmeasured observations are both considered. The Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorithm, which requires only first derivatives, is proposed to obtain the maximum likelihood estimates. We illustrate the statistics and parameter estimates by a fictitious example. The maximum likelihood method is compared to an alternative two-stage method.
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Affiliation(s)
- M L Tang
- Department of Statistics, Chinese University of Hong Kong, Shatin, NT, Hong Kong
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32
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Tang ML, Hale LP, Steeber DA, Tedder TF. L-selectin is involved in lymphocyte migration to sites of inflammation in the skin: delayed rejection of allografts in L-selectin-deficient mice. J Immunol 1997; 158:5191-9. [PMID: 9164936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Adhesion of leukocytes to vascular endothelium is crucial for leukocyte migration into tissues. The contributions of L-selectin, P-selectin, and ICAM-1 to interactions between lymphocytes and endothelium was examined using allogeneic skin graft rejection as a model of cutaneous inflammation. L-selectin-deficient (L-selectin(-/-)) mice rejected both primary and secondary allogeneic (BALB/c) skin grafts significantly more slowly than L-selectin(+/+) littermates. Furthermore, skin graft rejection remained significantly delayed in L-selectin(-/-) mice, despite placement of grafts 7 days after i.p. immunization with allogeneic cells, when CTL responses in L-selectin(-/-) mice and L-selectin(+/+) littermates were confirmed to be equivalent. Indeed, specific CTL responses to BALB/c splenocytes were normal or elevated in L-selectin(-/-) mice following either skin grafts or immunization. However, the number of T lymphocytes within allogeneic grafts was lower in L-selectin(-/-) mice as compared with L-selectin(+/+) littermates. Therefore, delayed rejection of skin grafts by L-selectin(-/-) mice reflects impaired migration of effector cells into the graft rather than delayed or impaired generation of a CTL response. In contrast to L-selectin(-/-) mice, P-selectin-deficient and ICAM-1-deficient mice rejected allogeneic skin grafts normally. These findings delineate an important role for L-selectin in lymphocyte recruitment to cutaneous sites of inflammation.
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Affiliation(s)
- M L Tang
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
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33
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Tang ML, Hale LP, Steeber DA, Tedder TF. L-selectin is involved in lymphocyte migration to sites of inflammation in the skin: delayed rejection of allografts in L-selectin-deficient mice. The Journal of Immunology 1997. [DOI: 10.4049/jimmunol.158.11.5191] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Adhesion of leukocytes to vascular endothelium is crucial for leukocyte migration into tissues. The contributions of L-selectin, P-selectin, and ICAM-1 to interactions between lymphocytes and endothelium was examined using allogeneic skin graft rejection as a model of cutaneous inflammation. L-selectin-deficient (L-selectin(-/-)) mice rejected both primary and secondary allogeneic (BALB/c) skin grafts significantly more slowly than L-selectin(+/+) littermates. Furthermore, skin graft rejection remained significantly delayed in L-selectin(-/-) mice, despite placement of grafts 7 days after i.p. immunization with allogeneic cells, when CTL responses in L-selectin(-/-) mice and L-selectin(+/+) littermates were confirmed to be equivalent. Indeed, specific CTL responses to BALB/c splenocytes were normal or elevated in L-selectin(-/-) mice following either skin grafts or immunization. However, the number of T lymphocytes within allogeneic grafts was lower in L-selectin(-/-) mice as compared with L-selectin(+/+) littermates. Therefore, delayed rejection of skin grafts by L-selectin(-/-) mice reflects impaired migration of effector cells into the graft rather than delayed or impaired generation of a CTL response. In contrast to L-selectin(-/-) mice, P-selectin-deficient and ICAM-1-deficient mice rejected allogeneic skin grafts normally. These findings delineate an important role for L-selectin in lymphocyte recruitment to cutaneous sites of inflammation.
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Affiliation(s)
- M L Tang
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
| | - L P Hale
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
| | - D A Steeber
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
| | - T F Tedder
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
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Sato S, Miller AS, Inaoki M, Bock CB, Jansen PJ, Tang ML, Tedder TF. CD22 is both a positive and negative regulator of B lymphocyte antigen receptor signal transduction: altered signaling in CD22-deficient mice. Immunity 1996; 5:551-62. [PMID: 8986715 DOI: 10.1016/s1074-7613(00)80270-8] [Citation(s) in RCA: 357] [Impact Index Per Article: 12.8] [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: 02/03/2023]
Abstract
B cell activation following antigen receptor cross-linking can be augmented in vitro by ligation of cell surface CD22, which associates with the SHP1 protein tyrosine phosphatase. The targeted deletion of CD22 in mice demonstrated that CD22 differentially regulates antigen receptor signaling in resting and antigen-stimulated B lymphocytes. B cells from CD22-deficient mice exhibited the cell surface phenotype and augmented intracellular calcium responses characteristic of chronically stimulated B cells, as occurs in SHP1-defective mice. Thus, CD22 negatively regulates antigen receptor signaling in the absence of antigen. However, activation of CD22-deficient B lymphocytes by prolonged IgM cross-linking resulted in modest B cell proliferation, demonstrating that CD22 positively regulates antigen receptor signaling in the presence of antigen.
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MESH Headings
- Animals
- Antibody Formation
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, Differentiation, B-Lymphocyte/genetics
- Antigens, Differentiation, B-Lymphocyte/metabolism
- B-Lymphocytes/immunology
- Calcium/metabolism
- Cell Adhesion Molecules
- Gene Deletion
- Gene Expression Regulation, Developmental
- Immunoglobulin D/biosynthesis
- Immunoglobulin Isotypes/blood
- Immunoglobulin M/biosynthesis
- Lectins
- Lymphocyte Activation
- Mice
- Mice, Mutant Strains
- Receptors, Antigen, B-Cell/biosynthesis
- Receptors, Antigen, B-Cell/metabolism
- Sialic Acid Binding Ig-like Lectin 2
- Signal Transduction
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Affiliation(s)
- S Sato
- Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Rodriguez A, Zhou Z, Tang ML, Meller S, Chen J, Bellen H, Kimbrell DA. Identification of immune system and response genes, and novel mutations causing melanotic tumor formation in Drosophila melanogaster. Genetics 1996; 143:929-40. [PMID: 8725239 PMCID: PMC1207349 DOI: 10.1093/genetics/143.2.929] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
We are using Drosophila as a model system for analysis of immunity and tumor formation and have conducted two types of screens using enhancer detector strains to find genes related to these processes; genes expressed in the immune system (type A; hemocytes, lymph glands and fat body) and genes increased in expression by bacterial infection (type B). For type A, tissue-specific reporter gene activity was determined. For type B, a variation of enhancer detection was devised in which beta-galactosidase is assayed spectrophotometrically with and without bacterial infection. Because of immune system involvement in melanotic tumor formation, a third type was hypothesized to be found among types A and B; genes that, when mutated, have a melanotic tumor phenotype. Enhancer detector strains (2800) were screened for type A, 900 for B, and 11 retained for further analysis. Complementation tests, cytological mapping, P-element mobilization, and determination of lethal phase and mutant phenotype have identified six novel genes, Dorothy, wizard, toto, viking, Thor and dappled, and one previously identified gene, Collagen IV. All are associated with reporter gene expression in at least one immune system tissue. Thor has increased expression upon infection. Mutations of wizard and dappled have a melanotic tumor phenotype.
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Affiliation(s)
- A Rodriguez
- Department of Biology, University of Houston, Texas 77204, USA
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36
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Abstract
The toxicity of an agent or the therapeutic effect of a drug may be assessed by a dose-response study. We present a method for computing the exact power of exact and large sample statistical tests employed for binary response data from such a study. This method, based on recursive polynomial multiplications, enables fast computation of exact power for studies with up to a moderately large sample size. We demonstrate the efficiency of our method using three examples. The method is suitable for the design and power analysis of dose-response studies in which the usual asymptotic approximations are suspect.
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Affiliation(s)
- M L Tang
- Department of Biostatistics, UCLA School of Public Health, USA
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37
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Abstract
Previous studies have demonstrated increased production of interleukin-4 (IL-4) and reduced production of interferon (IFN)-gamma in stimulated peripheral blood mononuclear cell cultures from children and adults with atopic dermatitis, however, it is unclear whether such an imbalance of cytokine production relates to other childhood atopic diseases such as asthma, and in particular to the presence of the atopic state per se. The production of IL-4 and IFN gamma in phytohaemagglutin- (PHA)-stimulated peripheral blood mononuclear cell (PBMC) cultures from atopic and non-atopic children with moderately severe chronic persistent asthma, and a group of age-matched non-atopic controls who did not have asthma was examined. Atopic children with asthma produced significantly more IL-4 and less IFN gamma than non-atopic children with asthma and non-atopic controls who did not have asthma. There was no significant difference in IL-4 or IFN gamma production between non-atopic children with asthma and controls. These findings demonstrate that an imbalance of IL-4 and IFN gamma production is present in atopic asthma as previously documented in atopic dermatitis, therefore suggesting that it is a feature of the atopic state per se.
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Parkville, Victoria, Australia
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38
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Abstract
There is evidence to suggest that the production of some cytokines in childhood is different to that in adults. The production of IL4 in PHA-stimulated PBMC cultures was examined in healthy neonates, children and adults to determine the ontogeny of IL4 production throughout childhood. In vitro IL4 production was found to be significantly reduced in neonates and children under 10 years of age as compared to adults, and to increase progressively with age. The mechanisms leading to reduced IL4 production in neonates were shown to be different to those in children, with a defect in signal transduction demonstrated for lymphocytes from neonates but not children < 10 years. The presence of an inhibitory factor in cord blood plasma was also noted. These age-dependent variations in IL4 production and response to stimulation with PMA/Ca may reflect differences in naive and memory T cell populations.
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Melbourne, Australia
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39
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Abstract
Low interferon-gamma (IFN-gamma) secretion has been found in individuals with active atopic disease. Whether this is a cause or result of the disease process is uncertain. Cord blood IFN-gamma secretion was examined in 35 neonates who were then prospectively followed up for 1 year for the development of atopic disease. Infants who developed either symptoms of atopic disease or a positive IgE-mediated skin prick test at 12 months of age produced significantly less IFN-gamma at birth compared with those who did not (p = 0.005). This reduced secretion of IFN-gamma at birth indicates that the defect in interferon secretion is a primary component of the atopic state rather than an effect of the disease process.
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Melbourne, Australia
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40
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Abstract
Normal lymphocytes do not generally produce or secrete lymphokines in the resting or unstimulated state and only express or release cytokines following activation. Recently, the spontaneous production of intracellular interferon-gamma (IFN-gamma) and spontaneous secretion of IL-6 has been documented in patients with atopic dermatitis. These findings indicated that lymphocytes had been previously activated in vivo. Such in vivo activation may also be associated with spontaneous production of IL-4. As measurement of IL-4 secretion by immunoassay is complicated by poor sensitivity, and only provides information on the net amount of cytokine present after secretion, adsorption, consumption and degradation have occurred, IL-4 mRNA expression in peripheral blood lymphocytes from children with atopic dermatitis and controls was examined by polymerase chain reaction (PCR)-assisted mRNA amplification. Spontaneous expression of IL-4 mRNA was detected in four of eight patients with severe atopic dermatitis. Following stimulation in vitro, seven of eight atopic patients demonstrated detectable IL-4 mRNA. In comparison, no spontaneous expression of IL-4 mRNA was found in controls, and only six of 10 controls expressed IL-4 mRNA in stimulated cultures. The spontaneous expression of IL-4 mRNA in unstimulated cultures from children with atopic dermatitis supports the possibility that previous in vivo activation has occurred, and suggests that IL-4 production is increased in vivo in atopic dermatitis. This in vivo activation together with the constitutive expression of IL-4 mRNA are likely to contribute to the spontaneous in vitro production of IgE in atopic patients.
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Parkville, Victoria, Australia
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41
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Tang ML, Varigos G, Kemp AS. Reduced interferon-gamma (IFN-gamma) secretion with increased IFN-gamma mRNA expression in atopic dermatitis: evidence for a post-transcriptional defect. Clin Exp Immunol 1994; 97:483-90. [PMID: 8082304 PMCID: PMC1534845 DOI: 10.1111/j.1365-2249.1994.tb06114.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Reduced secretion of IFN-gamma in atopic individuals has been implicated in the pathogenesis of disease, though the mechanisms leading to this reduced secretion have not been elucidated. As production of IFN-gamma has been shown to be predominantly regulated by its rate of transcription, expression of IFN-gamma mRNA was examined in atopic children and in age-matched, non-atopic controls by polymerase chain reaction (PCR)-assisted mRNA amplification. Children with atopic dermatitis were found to have constitutive expression of IFN-gamma mRNA in freshly isolated peripheral blood mononuclear cells (PBMC) and in unstimulated PBMC cultures which increased further following stimulation with phorbol myristate acetate (PMA)/Ca in vitro. In contrast, expression of IFN-gamma mRNA in controls was only detected in stimulated cultures, as has been demonstrated previously for normal adults. These findings demonstrate that circulating T cells from atopic children have been activated in vivo, and suggest that T cell activation is a significant component of the inflammatory process in atopic dermatitis. Although expression of IFN-gamma mRNA was increased in the atopic children, secretion was confirmed to be significantly lower than in controls, indicating that the defect(s) underlying reduced IFN-gamma secretion in these individuals lie post-transcriptionally.
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Parkville, Victoria, Australia
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42
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Abstract
When designing a study that may generate a set of sparse 2 x 2 tables, or when confronted with 'negative' results upon exact analysis of such tables, we need to compute the power of exact tests. In this paper we provide an efficient approach for computing exact unconditional power for four exact tests on the common odds ratio in a series of 2 x 2 tables. These tests are the traditional exact test; a test based on a probability ordering of the sample space; and two tests based on ordering the sample space according to distance from the mean, or median. For each test, we consider both a conservative version and a mid-P adjusted version. We explore three computational options for power determination: exact power computation, calculation of exact upper and lower bounds for power, and Monte Carlo confidence bounds for power. We present an interactive program implementing these options. For study design, the program may be run several times to arrive at a sample configuration with adequate power.
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Affiliation(s)
- K F Hirji
- Department of Biomathematics, UCLA School of Medicine 90024-1766
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43
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Parrkville, Victoria, Australia
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44
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Abstract
The vascular supply to the distal part of sartorius m. was studied in 37 limbs by dissection under magnification and after black ink and latex injections. The muscle or myocutaneous island flap pedicled on the saphenous artery (SA) is supplied by a retrograde circulation through anastomoses of the SA with the perforating branches of the posterior tibial artery and the medial inferior genicular artery. Three different vascular patterns were defined. Retrograde injection also showed good perfusion of the SA. The flap is useful for covering around the knee, the proximal and middle thirds of the lower leg, and the end of the amputation stump. Raising of the flap has not resulted in any functional or cosmetic defect. Eighteen operations have so far been performed, six using the muscle island flap and twelve using the myocutaneous island flap, and all survived completely.
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Affiliation(s)
- M L Tang
- Department of Anatomy, Hengyang Medical School, Hunan, People's Republic of China
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45
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Abstract
The first description of an association of isolated growth hormone deficiency (IGHD) and combined immunodeficiency is presented. The findings suggest that IGHD should be considered as a cause of short stature in children with combined immunodeficiency before attributing growth retardation to infection.
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Affiliation(s)
- M L Tang
- Department of Immunology, Royal Children's Hospital, Victoria, Australia
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