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Mancini A, Wieland E, Geng G, Lothenbach B, Wehrli B, Dähn R. Corrigendum to 'Fe(II) interaction with cement phases: Method development, wet chemical studies and X-ray absorption spectroscopy'. [J. Colloid Interface Sci. 588 (2021) 692-704]. J Colloid Interface Sci 2021; 611:773. [PMID: 34895728 DOI: 10.1016/j.jcis.2021.11.185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- A Mancini
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland; ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, 8092 Zurich, Switzerland
| | - E Wieland
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland.
| | - G Geng
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland; National University of Singapore, Department of Civil and Environmental Engineering, 117576, Singapore
| | - B Lothenbach
- Empa, Laboratory for Concrete & Construction Chemistry, 8600 Dübendorf, Switzerland; NTNU, Department of Structural Engineering, Trondheim, Norway
| | - B Wehrli
- ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, 8092 Zurich, Switzerland
| | - R Dähn
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland
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Wu SC, Wang XJ, Ji JY, Geng G, Zhang ZH, Hou DL. [A preliminary investigation on a deep learning convolutional neural networks based pulmonary tuberculosis CT diagnostic model]. Zhonghua Jie He He Hu Xi Za Zhi 2021; 44:450-455. [PMID: 34865365 DOI: 10.3760/cma.j.cn112147-20210108-00026] [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 evaluate the clinical value of a pulmonary tuberculosis CT diagnostic model based on deep learning convolutional neural networks (CNN). Methods: From March 2017 to March 2018,a total of 1 764 patients with positive sputum for tuberculous bacterium and had received high-resolution chest CT scan in radiology department of Hebei province chest hospital were enrolled. Among them, 937 were male, and 827 were female, aging from 17-73 years (average 38.4). A total of 20 139 CT images (17 kinds of image features) classified by 4 radiologists were used as training dataset to create a tuberculosis CT CNN diagnostic model. The top 5 image features in training set were: infiltrative pulmonary tuberculosis, cavitary pulmonary tuberculosis, pleural thickening, caseous pneumonia and pleural effusion. A total of 302 images were randomly selected from the marked images as testing dataset. The diagnosis of 2 senior radiologists was taken as "golden standard". The differences of sensitivity and accuracy in CT diagnosis between the CNN diagnostic model and the radiologists were compared. The classification error types and numbers of the CNN diagnostic model were recorded. FROC(free response operating characteristic curve)curve was drawn and the highest diagnostic efficiency of the model was measured. Results: The diagnostic accuracy of infiltrative pulmonary tuberculosis, cavitary pulmonary tuberculosis, pleural thickening, caseous pneumonia and pleural effusion by the CNN diagnostic model were 95.33%(10 982/11 520), 73.68%(2 151/2 920), 73.07%(1 128/1544), 83.33%(1 020/1225)and 94.11%(814/865), respectively. The overall diagnostic sensitivity and accuracy of the CNN model were 95.49%(339/355)and 90.40%(339/375), respectively, and the corresponding values of radiologists were 93.80%(348/371)and 92.80%(348/375), respectively, and there was no statistical difference between the CNN model and the radiologists(sensitivity χ2=1.022,P=0.312;accuracy χ2=1.404,P=0.236). FROC curve showed that when sensitivity of the CNN model was 78% and FPI value was 2.48, it reached the highest diagnostic efficiency. The classification error of CNN diagnostic models was mainly confusion of fiber stripe components, cavitary pulmonary tuberculosis, caseous pneumonia and infiltrative pulmonary tuberculosis. Conclusions: The CNN-based pulmonary tuberculosis CT diagnostic model exhibited high sensitivity and accuracy (95.49% and 90.40% respectively). It could assist radiologists in CT diagnosis of pulmonary tuberculosis and deserve further clinical application.
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Affiliation(s)
- S C Wu
- Department of Radiology, Hebei Province Chest Hospital, Shijiazhuang 050041, China
| | - X J Wang
- Department of Radiology, Hebei Province Chest Hospital, Shijiazhuang 050041, China
| | - J Y Ji
- Department of Radiology, Hebei Province Chest Hospital, Shijiazhuang 050041, China
| | - G Geng
- Department of Radiology, Hebei Province Chest Hospital, Shijiazhuang 050041, China
| | - Z H Zhang
- Department of Radiology, Hebei Province Chest Hospital, Shijiazhuang 050041, China
| | - D L Hou
- Department of Radiology, Beijing Chest Hospital Affiliated to Capital Medical University, Beijing 101149, China
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Mancini A, Wieland E, Geng G, Lothenbach B, Wehrli B, Dähn R. Fe(II) interaction with cement phases: Method development, wet chemical studies and X-ray absorption spectroscopy. J Colloid Interface Sci 2020; 588:692-704. [PMID: 33309242 DOI: 10.1016/j.jcis.2020.11.085] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 11/11/2020] [Accepted: 11/23/2020] [Indexed: 10/22/2022]
Abstract
Fe(II) interaction with cement phases was studied by means of co-precipitation and sorption experiments in combination with X-ray absorption fine structure (XAFS) spectroscopy. Oxidation of Fe(II) was fast in alkaline conditions and therefore, a methodology was developed which allowed Fe(II) to be stabilised in the sorption experiments and to prepare samples for spectroscopy. X-ray diffraction (XRD) of the co-precipitation samples showed uptake of a small portion of Fe(II) by calcium-silicate-hydrates (C-S-H) in the interlayer indicated by an increase in the interlayer spacing. Fe(II) incorporation by AFm phases was not indicated. Wet chemical experiments using 55Fe radiotracer revealed linear sorption of Fe(II) irrespective of the Ca/Si ratio of C-S-H and equilibrium pH. The Kd values for Fe(II) sorption on C-S-H are more than three orders of magnitude lower as compared to Fe(III), while they are comparable to those of other bivalent metal cations. XAFS spectroscopy showed Fe(II) binding by C-S-H in an octahedral coordination environment. The large number of neighbouring atoms rules out the formation of a single surface-bound Fe(II) species. Instead the data suggest presence of Fe(II) in a structurally bound entity. The data from XRD and XAFS spectroscopy suggests the presence of both surface- and interlayer-bound Fe(II) species.
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Affiliation(s)
- A Mancini
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland; ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, 8092 Zurich, Switzerland
| | - E Wieland
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland.
| | - G Geng
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland; National University of Singapore, Department of Civil and Environmental Engineering, 117576, Singapore
| | - B Lothenbach
- Empa, Laboratory for Concrete & Construction Chemistry, 8600 Dübendorf, Switzerland; NTNU, Department of Structural Engineering, Trondheim, Norway
| | - B Wehrli
- ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, 8092 Zurich, Switzerland
| | - R Dähn
- Paul Scherrer Institut, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland
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4
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Liu J, Geng G, Liang G, Wang L, Luo K, Yuan J, Zhao S. A novel topoisomerase I inhibitor DIA-001 induces DNA damage mediated cell cycle arrest and apoptosis in cancer cell. Ann Transl Med 2020; 8:89. [PMID: 32175382 DOI: 10.21037/atm.2019.12.138] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Background DNA topoisomerase enzyme plays an essential role in controlling the DNA topology structure by binding to DNA and cutting the phosphate backbone of either one or both of the DNA strands. Here, we have identified a small molecule inhibitor, DIA-001, that directly binds to Topoisomerase 1 (Topo I) and promotes the Topo I-DNA adducts. Methods In this study, we investigated the antitumor effects of DIA-001 using MTS assay and colony formation. We examined cell cycle of tumor cells with DIA-001 treatment in vitro by flow cytometry. And we investigated DNA damage and cell cycle marker protein after treatment with DIA-001 at different concentration and time point by western blot. Immunofluorescence was performance to detect the nuclear foci. The effects of DIA-001 on Topo I and Topo II activities were examined by DNA relaxation assays. Results We demonstrate that DIA-001 inhibit DNA replication and arrest cell cycle progression at the G2/M phase by directly binds to Topo I and promotes the Topo I-DNA adducts. In addition, DIA-001 can activate the DNA damage response signaling cascade, resulting in apoptosis in treated cells. Conclusions Our findings show a novel compound for treatment of cancer cells with the potential as a chemotherapy candidate that is less toxic to normal cells.
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Affiliation(s)
- Jiaqi Liu
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Guohe Geng
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Guang Liang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Ling Wang
- Department of Pharmacy, Fujian Provincial Hospital, Provincial Clinical College of Fujian Medical University, Fuzhou 350001, China
| | - Kuntian Luo
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China.,Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Jian Yuan
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China.,Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Shiguang Zhao
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
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Chen Y, Wu J, Liang G, Geng G, Zhao F, Yin P, Nowsheen S, Wu C, Li Y, Li L, Kim W, Zhou Q, Huang J, Liu J, Zhang C, Guo G, Deng M, Tu X, Gao X, Liu Z, Chen Y, Lou Z, Luo K, Yuan J. CHK2-FOXK axis promotes transcriptional control of autophagy programs. Sci Adv 2020; 6:eaax5819. [PMID: 31911943 PMCID: PMC6938702 DOI: 10.1126/sciadv.aax5819] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 10/23/2019] [Indexed: 05/08/2023]
Abstract
Autophagy is an evolutionarily conserved catabolic process, which plays a vital role in removing misfolded proteins and clearing damaged organelles to maintain internal environment homeostasis. Here, we uncovered the checkpoint kinase 2 (CHK2)-FOXK (FOXK1 and FOXK2) axis playing an important role in DNA damage-mediated autophagy at the transcriptional regulation layer. Mechanistically, following DNA damage, CHK2 phosphorylates FOXK and creates a 14-3-3γ binding site, which, in turn, traps FOXK proteins in the cytoplasm. Because FOXK functions as the transcription suppressor of ATGs, DNA damage-mediated FOXKs' cytoplasmic trapping induces autophagy. In addition, we found that a cancer-derived FOXK mutation induces FOXK hyperphosphorylation and enhances autophagy, resulting in chemoresistance. Cotreatment with cisplatin and chloroquine overcomes the chemoresistance caused by FOXK mutation. Overall, our study highlights a mechanism whereby DNA damage triggers autophagy by increasing autophagy genes via CHK2-FOXK-mediated transcriptional control, and misregulation of this pathway contributes to chemoresistance.
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Affiliation(s)
- Yuping Chen
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Jinhuan Wu
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Guang Liang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Guohe Geng
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Fei Zhao
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Ping Yin
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | | | - Chengming Wu
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Yunhui Li
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Lei Li
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Wootae Kim
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Qin Zhou
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Jinzhou Huang
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Jiaqi Liu
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Chao Zhang
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Guijie Guo
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Min Deng
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Xinyi Tu
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Xiumei Gao
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 300193 Tianjin, China
| | - Zhongmin Liu
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Yihan Chen
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Zhenkun Lou
- Department of Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Kuntian Luo
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Jian Yuan
- Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
- Corresponding author.
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Wang T, Huang S, Geng G. Comparison of the duration of neuromuscular blockade following a single bolus dose of rocuronium during laparoscopic gynaecological surgery vs conventional open surgery. Anaesthesia 2014; 69:854-9. [PMID: 24820378 DOI: 10.1111/anae.12707] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/23/2014] [Indexed: 12/17/2022]
Abstract
We investigated whether laparoscopic vs open surgical approaches affected the duration of neuromuscular blockade following a single bolus dose of rocuronium. Fifty-three female patients underwent either laparoscopic or open gynaecological surgery. Rocuronium 0.6 mg.kg(-1) was administered to achieve neuromuscular blockade in all subjects, and adductor pollicis train-of-four responses following ulnar nerve stimulation were monitored with mechanomyography. The mean (SD) time from injection of rocuronium until spontaneous recovery of the first twitch, and to 5% and 25% of baseline, was significantly prolonged in the laparoscopic group (27.2 (8.3) min, 31.3 (9.1) min and 38.1 (10.6) min, respectively) compared with the open surgery group (21.1 (5.8) min, 25.6 (6.3) min and 31.2 (6.7) min, respectively). Changes in liver function both before surgery and at 24 h postoperatively were similar between the two groups (p > 0.05). Our findings suggest that neuromuscular blockade may be prolonged following a single bolus dose of rocuronium given during laparoscopic procedures.
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Affiliation(s)
- T Wang
- Department of Anaesthesia, Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
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Green MA, Geng G, Qin E, Sinkus R, Gandevia SC, Bilston LE. Measuring anisotropic muscle stiffness properties using elastography. NMR Biomed 2013; 26:1387-1394. [PMID: 23640745 DOI: 10.1002/nbm.2964] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 03/21/2013] [Accepted: 03/24/2013] [Indexed: 05/29/2023]
Abstract
Physiological and pathological changes to the anisotropic mechanical properties of skeletal muscle are still largely unknown, with only a few studies quantifying changes in vivo. This study used the noninvasive MR elastography (MRE) technique, in combination with diffusion tensor imaging (DTI), to measure shear modulus anisotropy in the human skeletal muscle in the lower leg. Shear modulus measurements parallel and perpendicular to the fibre direction were made in 10 healthy subjects in the medial gastrocnemius, soleus and tibialis anterior muscles. The results showed significant differences in the medial gastrocnemius (μ‖ = 0.86 ± 0.15 kPa; μ⊥ = 0.66 ± 0.19 kPa, P < 0.001), soleus (μ‖ = 0.83 ± 0.22 kPa; μ⊥ = 0.65 ± 0.13 kPa, P < 0.001) and the tibialis anterior (μ‖ = 0.78 ± 0.24 kPa; μ⊥ = 0.66 ± 0.16 kPa, P = 0.03) muscles, where the shear modulus measured in the direction parallel is greater than that measured in the direction perpendicular to the muscle fibres. No significant differences were measured across muscle groups. This study provides the first direct estimates of the anisotropic shear modulus in the triceps surae muscle group, and shows that the technique may be useful for the probing of mechanical anisotropy changes caused by disease, aging and injury.
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Affiliation(s)
- M A Green
- Neuroscience Research Australia, Randwick, NSW, Australia; School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
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Zhan Q, Huang S, Geng G, Xie Y. Comparison of relative potency of intrathecal bupivacaine for motor block in pregnant versus non-pregnant women. Int J Obstet Anesth 2011; 20:219-23. [DOI: 10.1016/j.ijoa.2011.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 12/27/2010] [Accepted: 01/08/2011] [Indexed: 10/18/2022]
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Vaya J, Song W, Khatib S, Geng G, Schipper H. EFFECTS OF HEME OXYGENASE-1 EXPRESSION ON STEROL HOMEOSTASIS IN RAT ASTROGLIA. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70133-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Wang PP, Elsbett-Koeppen R, Geng G, Badley EM. Arthritis prevalence and place of birth: findings from the 1994 Canadian National Population Health Survey. Am J Epidemiol 2000; 152:442-5. [PMID: 10981458 DOI: 10.1093/aje/152.5.442] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This paper describes the prevalence of arthritis in Canadians by ethnic origin, including Asians, Europeans/Australians, and North American-born Canadians. Data for this study were derived from the 1994 Canadian National Population Health Survey, a cross-sectional survey with a sample of 39,240 persons aged 20 years and older. Arthritis was defined as a long-term health condition of "arthritis or rheumatism" diagnosed by a health professional. Place of birth was determined according to self-reported country of birth. Unconditional multiple logistic regression models were used to adjust for potential confounding effects. The crude prevalence of self-reported arthritis and rheumatism diagnosed by a health professional as a long-term condition for those aged 20 years and older in Canada was 14.2%. The age-sex adjusted prevalence by place of birth was 6.9% in Asians, 14.2% in Europeans/Australians, and 14.5% in North American-born Canadians. In the multivariate analyses using North America-born Canadians as baseline, the risk for arthritis (odds ratio = 0.56) was significantly lower in Asian-born Canadians after adjustment for age, sex, education, income, occupation, and body mass index.
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Affiliation(s)
- P P Wang
- Arthritis Community Research and Evaluation Unit, The Arthritis and Immune Disorder Research Centre, University Health Network, Toronto, Ontario, Canada
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Abstract
The aim of the present study was to investigate whether the dihydropyridine-sensitive L-type Ca2+ channel is operative in adrenal catecholamine (CA) secretion induced by a novel neuropeptide, pituitary adenylate cyclase-activating polypeptide (PACAP), in anesthetized dogs. Plasma CA concentrations in adrenal venous and aortic blood were determined by a high-performance liquid chromatography method. All drugs tested were locally infused into the left adrenal gland via the left adrenolumbar artery. PACAP, with the isoform consisting of 27 (PACAP-27) and 38 (PACAP-38) amino acid residues, significantly increased CA output in a dose-dependent manner, with doses ranging from 5 to 500 ng and 7 to 700 ng, respectively. However, the amplitude of epinephrine response to PACAP-27 was three times greater than that obtained with PACAP-38 at the highest dose tested. In a separate group, a single dose of PACAP-27 (50 ng) induced highly reproducible CA responses when the same dose was repeated with an interval of 35 min. In dogs treated with nifedipine (50 microg), 5 min before the second administration of PACAP-27, the net CA response was significantly inhibited by approximately 50% compared with that obtained in the presence of vehicle. A similar CA response to BAY K 8644 (5 microg) was completely abolished by the same dose of nifedipine. The present results indicate that both PACAP-27 and PACAP-38 have the direct local secretagogue effect on the adrenal medulla in vivo and that CA responses to PACAP-27 were greater than those observed with PACAP-38 at equivalent mole doses. The study suggests that the dihydropyridine-sensitive L-type Ca2+ channel is functionally involved in PACAP-induced adrenal CA secretion in the canine adrenal medulla in vivo.
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Affiliation(s)
- G Geng
- Group de Recherche sur le Système Nerveux Autonome, Faculté de Pharmacie, Université de Montréal, Québec, Canada
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Yu JJ, Glynn TJ, Pechacek TF, Manley MW, Mueller MD, Geng G, Wang S, Gao Y, Lynn WR. The role of physicians in combatting the growing health crisis of tobacco-induced death and disease in the People's Republic of China. Promot Educ 1995; 2:23-30, 58. [PMID: 7749643 DOI: 10.1177/102538239500200113] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- J J Yu
- Division of Cancer Treatment, National Cancer Institute, Bethesda, Maryland 20892, USA
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Geng G. [Epidemiologic study of chronic diseases]. Zhonghua Liu Xing Bing Xue Za Zhi 1991; 12:302-5. [PMID: 1782663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Schofer J, Büttner J, Geng G, Gutschmidt K, Herden HN, Mathey DG, Moecke HP, Polster P, Raftopoulo A, Sheehan FH. Prehospital thrombolysis in acute myocardial infarction. Am J Cardiol 1990; 66:1429-33. [PMID: 2251987 DOI: 10.1016/0002-9149(90)90528-9] [Citation(s) in RCA: 85] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The benefit and risk of prehospital thrombolysis for acute myocardial infarction (AMI) were evaluated in a double-blind randomized trial. Patients presenting less than 4 hours after symptom onset received 2 million units of urokinase as an intravenous bolus either before (group A, n = 40) or after (group B, n = 38) hospital admission. The mean time interval from onset of symptoms to thrombolytic therapy was 85 +/- 51 minutes in group A and 137 +/- 50 minutes in group B (p less than 0.0005). In 91% of the patients, thrombolytic therapy was administered less than 3 hours after symptom onset. Complication rates during the pre- and in-hospital period were low and did not differ between groups. Three patients died (1 in group A, 2 in group B) from reinfarction 7 to 14 days after admission. Left-sided cardiac catheterization before discharge revealed a patency rate in the infarct-related artery of 61% in group A and 67% in group B (difference not significant). Global left ventricular function and regional wall motion at the infarct site did not differ significantly between group A and B (ejection fraction 51 +/- 10%, n = 28 vs 53 +/- 14%, n = 28; wall motion -2.3 +/- 1.3 vs -2.2 +/- 1.1 standard deviation, respectively). Also, peak creatine kinase did not differ significantly (838 +/- 634 U/liter in group A vs 924 +/- 595 U/liter in group B). Prehospital thrombolysis using a bolus injection of urokinase has a low risk when performed by a trained physician with a mobile care unit. The saving of 45 minutes in the early stage of an acute infarction through prehospital thrombolysis did not appear to be important for salvage of myocardial function.
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Affiliation(s)
- J Schofer
- Universitätskrankenhaus Eppendorf, Hamburg, Federal Republic of Germany
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Geng G, Edlavitch SA. [Brief introduction to pharmacoepidemiology]. Zhonghua Liu Xing Bing Xue Za Zhi 1990; 11:368-71. [PMID: 2276190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Mathey DG, Büttner J, Geng G, Gutschmidt HJ, Herden HN, Moecke H, Polster H, Raftopoulo R, Schofer J, Sheehan FH. [The thrombolysis treatment of acute myocardial infarct at the site of the emergency. A randomized double-blind study]. Dtsch Med Wochenschr 1990; 115:803-8. [PMID: 2187668 DOI: 10.1055/s-2008-1065083] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Two million units of urokinase were administered intravenously as a bolus, either before (group I, n = 40) or after hospital admission (group II, n = 38), to 66 men and 12 women (mean age 55 +/- 8 years) with typical symptoms of acute myocardial infarction of less than 4 hours' duration. Time elapsed between onset of symptoms and urokinase administration averaged 85 +/- 51 min for group I and 137 +/- 50 min for group II (P less than 0.005). The complication rate was low, both during the pre-hospital and the hospital phases, without any significant differences between the two groups. The rate of open infarct vessels (by angiography before discharge from hospital) was 61% for group I and 67% for group II (no significant difference). Global left ventricular function, regional wall motion in the infarct area and maximal creatinekinase values did not significantly differ between the two groups (ejection fraction 51 +/- 10% and 53 +/- 14%, respectively; creatinekinase 838 +/- 634 U/l and 924 +/- 595 U/l, respectively). The data indicate that thrombolytic pre-hospital treatment carried a low risk. The gain of 45 min, however, seems to be of secondary importance in any significant diminution of the acute infarction size.
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