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Hu W, Fang L, Zhang H, Ni R, Pan G. Global disease burden of COPD from 1990 to 2019 and prediction of future disease burden trend in China. Public Health 2022; 208:89-97. [PMID: 35728417 DOI: 10.1016/j.puhe.2022.04.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 04/15/2022] [Accepted: 04/29/2022] [Indexed: 11/18/2022]
Abstract
OBJECTIVES This study aimed to assess and predict the disease burden attributable to chronic obstructive pulmonary disease (COPD) in a timely, comprehensive, and reliable manner, thereby mitigating the health hazards of COPD. STUDY DESIGN AND METHODS Data on the disease burden owing to COPD from 1990 to 2019 were extracted from the Global Burden of Disease (GBD) Study 2019. Linear regression analysis was used to calculate the estimated annual percentage change (EAPC) in the age-standardized rates. Non-parametric tests were used for subgroup analysis. The Bayesian age-period-cohot (BAPC) model integrated nested Laplace approximations to predict the disease burden over the next 25 years. Sensitivity analysis was performed using the Norpred APC model. RESULTS Globally, the COPD-related age-standardized incidence rate decreased from 216.48/100,000 in 1990 to 200.49/100,000 in 2019, with an EAPC of -0.33. But the number of new cases increased from 8,722,966 in 1990 to 16, 214, 828 in 2019. Trends in prevalence, deaths, and disability-adjusted life years (DALYs) were the same as incidence. There were significant differences in disease burden between the genders and all age groups (P < 0.05) in China. The projections suggested that the COPD-related number of new cases and deaths in China would increase by approximately 1.5 times over the next 25 years. CONCLUSIONS The number of incidence, prevalence, deaths, and DALYs had all increased in China in the past and would continue to grow over the next 25 years. Therefore, measures should be taken to target risk factors and high-risk groups.
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Affiliation(s)
- W Hu
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, 230032, China
| | - L Fang
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, 230032, China
| | - H Zhang
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, 230032, China
| | - R Ni
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, 230032, China
| | - G Pan
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, 230032, China.
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2
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Chen M, Wang MC, Ni R, Wang J, Wang L, Wang GN, Zhang LY. [Role of probiotics in treatment of nonalcoholic fatty liver disease]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:77-80. [PMID: 28297790 DOI: 10.3760/cma.j.issn.1007-3418.2017.01.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is one of the most common chronic liver diseases in China and manifests as simple fatty liver, non-alcoholic steatohepatitis, liver cirrhosis, and hepatocellular carcinoma. Studies have shown that intestinal flora can affect the development and progression of NAFLD via the "gut-liver axis" . Probiotics are active microorganisms with beneficial effects on the host, and more and more studies have found that probiotics play a positive role in improving NAFLD. They are cheaper, less harmful, and safer compared with antibiotics and surgery, and therefore, it may become a new method for the prevention and treatment of NAFLD. This article reviews the research advances in probiotics in the treatment of NAFLD, in order to provide a basis for the treatment of NAFLD using probiotics.
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Affiliation(s)
- M Chen
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China; Clinical Center of Gastroenterology, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - M C Wang
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China; Clinical Center of Gastroenterology, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - R Ni
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China; Clinical Center of Gastroenterology, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - J Wang
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - L Wang
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China; Clinical Center of Gastroenterology, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - G N Wang
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China; Clinical Center of Gastroenterology, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - L Y Zhang
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730030, China; Department of Hepatology, Lanzhou University Second Hospital, Lanzhou 730030, China
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Zhang C, Li C, Chen X, Zhou Y, Yin B, Ni R, Zhang Y, Liu J. Overexpression of dishevelled 2 is involved in tumor metastasis and is associated with poor prognosis in hepatocellular carcinoma. Clin Transl Oncol 2017; 19:1507-1517. [PMID: 28589433 DOI: 10.1007/s12094-017-1697-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 05/29/2017] [Indexed: 02/06/2023]
Abstract
PURPOSE Although hepatocellular carcinoma (HCC) is one of the most common malignant tumors, its molecular mechanism is still unknown. Dishevelled 2 (Dvl2) is one of the downstream targets of non-canonical Wnt signaling, which has been demonstrated to be of great importance in the progression of cancers. Nevertheless, the expression mechanisms and physiological significance of Dvl2 in HCC remain unclear. METHODS Western blotting and immunohistochemistry were used to measure Dvl2 protein expression in HCC and adjacent normal tissues of 101 patients. Wound healing and transwell assays were used to determine cell migration and invasion. RESULTS Dvl2 expression was upregulated in HCC tissues compared to the adjacent normal tissues. Moreover, its expression level was significantly correlated with histological grade (P = 0.042), metastasis (P = 0.005) and vein invasion (P = 0.009) in patients with HCC. Wound healing and transwell assays showed that knockdown of Dvl2 reduced cell migration and invasion in HepG2 cells. Finally, we confirmed that Dvl2 could regulate the migration and invasion of HCC cells by interacting with P62 in non-canonical Wnt signaling. CONCLUSIONS Our data showed that Dvl2 was overexpressed in HCC tissues and was also correlated with poor prognosis, suggesting that Dvl2 is a novel therapeutic target for HCC.
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Affiliation(s)
- C Zhang
- Grade 14, Clinical Medicine, Medical College, Nantong University, Nantong, 226001, Jiangsu, People's Republic of China
| | - C Li
- Department of Hepatic Oncology, Affiliated Cancer Hospital of Nantong University, 30# Tong Yang Road, Nantong, 226361, Jiangsu, People's Republic of China
| | - X Chen
- Department of Hepatic Oncology, Affiliated Cancer Hospital of Nantong University, 30# Tong Yang Road, Nantong, 226361, Jiangsu, People's Republic of China
| | - Y Zhou
- Department of Hepatic Oncology, Affiliated Cancer Hospital of Nantong University, 30# Tong Yang Road, Nantong, 226361, Jiangsu, People's Republic of China
| | - B Yin
- Grade 14, Clinical Medicine, Medical College, Nantong University, Nantong, 226001, Jiangsu, People's Republic of China
| | - R Ni
- Department of Gastroenterology, Affiliated Hospital of Nantong University, 20# Xisi Road, Nantong, 226001, Jiangsu, People's Republic of China
| | - Y Zhang
- Department of Hepatic Oncology, Affiliated Cancer Hospital of Nantong University, 30# Tong Yang Road, Nantong, 226361, Jiangsu, People's Republic of China.
| | - J Liu
- Department of Gastroenterology, Affiliated Hospital of Nantong University, 20# Xisi Road, Nantong, 226001, Jiangsu, People's Republic of China.
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Lv XY, Ni R, Sun W, Su R, Musa HH, Yin JF, Wang QZ, Gao W, Chen L. Candidate genes for the development of hair follicles in Hu sheep. Genet Mol Res 2016; 15:gmr6877. [PMID: 27525902 DOI: 10.4238/gmr.15036877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The aim of this study was to detect candidate genes for the development of hair follicles in the Hu sheep breed. Seven genes have been detected in large, medium, and small wave follicles of Hu sheep using gene chip technology. The histological features of the follicles of newborn Hu-lambs were combined with fluorescence quantitative PCR technology to detect the correlation between the expression of the seven genes and hair follicle development. Among the genes studied, matrix metalloproteinase 2 (MMP2), bone morphogenetic protein-7 (BMP7), and sideroflexin 1 (SFXN1) showed a significantly different pattern of expression in large, medium, and small wave follicles (P < 0.05). The expression of MMP2 had a significant positive correlation with secondary follicles in large waves (P < 0.05), while the expression of BMP7 had a significant correlation with primary follicle diameter in small wave follicles, and a highly significant positive correlation with the number of secondary follicles in the small waves (P < 0.01). The expression of SFXN1 was significantly and positively correlated with the diameters of small wave primary follicles; it also showed a highly significant positive correlation with secondary follicle diameters. Although other genes are associated with hair follicles, their expression in large, medium, and small wave follicles was not significant. We propose that BMP7, MMP2, and SFXN1 genes could be important candidate genes for use in breeding Hu lambs with early coat development.
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Affiliation(s)
- X Y Lv
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - R Ni
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - W Sun
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - R Su
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - H H Musa
- Faculty of Medical Laboratory Sciences, University of Khartoum Khartoum, Sudan
| | - J F Yin
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - Q Z Wang
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - W Gao
- College of Animal Science and Technology, Yangzhou University Yangzhou, China
| | - L Chen
- Animal Science and Veterinary Medicine Bureau of Suzhou City Suzhou, China
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Shen J, Noon A, LIU Y, Kuk C, Ilczynski C, Ni R, Sukhu B, Chan K, Gunaratne A, Erlich A, Cremer C, Morris Q, Barbosa-Morais NL, Fleshner NE, Kulkarni GS, Blencowe B, Azad A, van der Kwast T, Zlotta A, Wrana JL. Molecular tumor grading of non muscle invasive bladder cancer based on whole transcriptome analysis. J Clin Oncol 2016. [DOI: 10.1200/jco.2016.34.2_suppl.467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
467 Background: There is an unmet need for a comprehensive genomic characterization of non muscle invasive bladder cancer (NMIBC). NMIBC comprise over 70% of all bladder cancers at presentation. They have highly variable clinical behavior that is not always adequately predicted on the basis of their histological grade (2004 World Health Organization low and high grade, LG-HG). The discrepancy between phenotype and genotype is compounded further by interobserver variability in pathological grading. We have previously established methods for whole transcriptome RNAseq from formalin fixed paraffin embedded tissues (FFPE). Methods: Whole transcriptomic analysis of 110 NMI FFPE BC both LG and HG was performed incorporating messenger RNA expression, splice variants, gene fusion, and pathway perturbation. We used a discovery (n = 40) and a validation cohort (n = 70). These data were integrated and tested for correlation with both pathological grading and clinical outcomes. Grade Risk Index (GRI) score quantifying how closely a patient's transcriptome is related to a reference set of LG NMIBC samples was established. Conventional pathological grading was reviewed by 3 different expert uro-pathologists and interobserver variability calculated. Results: Unsupervised clustering of data from RNA sequencing uncovered classification of three robust - - nonoverlapping, prognostically significant subtypes of NMIBC with distinct GRIs and signatures. When applied by expert pathologists, interobserver variability in histological grading was observed in 17.5%. In the intermediate group (GRI 0.13 to 0.19), pathologists disagreed in 37.5% whether BC was LG or HG. HG NMIBC clustered with MIBC. LG NMIBC in the intermediate GRI group included either very bulky tumors or extremely rare metastatic LG BC (n = 4). HG disease was associated with a shift in BMP signaling and a germ stem cell-like phenotype. Multiple components of the centromere complex and APOBEC3B were upregulated in HG BC. FGFR3::TACC3 fusion events were observed in LG NMIBC only (11.5%). Conclusions: Whole transcriptomic sequencing data delineated three molecular classes of NMIBC.
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Affiliation(s)
- Jess Shen
- Lunenfeld Tanenbaum Research Insitute, Toronto, ON, Canada
| | - Aidan Noon
- Lunenfeld Tanenbaum Research Insitute, Toronto, ON, Canada
| | - Yu LIU
- Lunenfeld Tanenbaum Research Insitute, Toronto, ON, Canada
| | - Cynthia Kuk
- Department of Surgery, Division of Urology, University of Toronto, Mount Sinai Hospital and University Health Network, Toronto, ON, Canada
| | | | - R Ni
- LTRI, Toronto, ON, Canada
| | | | - K Chan
- LTRI, Toronto, ON, Canada
| | | | | | | | | | | | | | | | | | - Azar Azad
- Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, ON, Canada
| | - Theodorus van der Kwast
- Department of Laboratory Medicine and Pathology, University Health Network, University of Toronto, Toronto, ON, Canada
| | | | - Jeff L Wrana
- Lunenfeld Tanenbaum Research Insitute, Toronto, ON, Canada
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Shaya SA, Saldanha LJ, Vaezzadeh N, Zhou J, Ni R, Gross PL. Comparison of the effect of dabigatran and dalteparin on thrombus stability in a murine model of venous thromboembolism. J Thromb Haemost 2016; 14:143-52. [PMID: 26514101 DOI: 10.1111/jth.13182] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 10/13/2015] [Indexed: 01/26/2023]
Abstract
UNLABELLED ESSENTIALS: Does thrombus stability alter the presentation of venous thromboembolism and do anticoagulants alter this? In a murine model, we imaged a femoral vein thrombus and quantified emboli in the pulmonary arteries. Dabigatran decreases thrombus stability via factor XIII increasing embolization and pulmonary emboli. This cautions against the unapproved use of dabigatran for acute initial treatment of deep vein thrombosis. BACKGROUND Venous thromboembolism (VTE) is a collective term for deep vein thrombosis (DVT) and pulmonary embolism (PE). Thrombus instability possibly contributes to progression of DVT to PE, and direct thrombin inhibitors (DTIs) may alter this. AIM To develop a model to assess thrombus stability and its link to PE burden, and identify whether DTIs, in contrast to low-molecular-weight heparin (LMWH), alter this correlation. METHODS Twelve minutes after ferric chloride-induced thrombus formation in the femoral vein of female mice, saline, dalteparin (LMWH) or dabigatran (DTI) was administered. Thrombus size and embolic events breaking off from the thrombus were quantified before treatment and at 10-min intervals after treatment for 2 h using intravital videomicroscopy. Lungs were stained for the presence of PE. RESULTS Thrombus size was similar over time and between treatment groups. Total and large embolic events and pulmonary emboli were highest after treatment with dabigatran. Variations in amounts of pulmonary embolic events were not attributed to variations in thrombus size. Large embolic events correlated with the number of emboli per lung slice independent of treatment. Embolization in factor XIII deficient (FXIII(-/-) ) saline-treated mice was greater than that in wild-type (WT) saline-treated mice, but was similar to WT dabigatran-treated mice. CONCLUSION We have developed a mouse model of VTE that can quantify emboli and correlate this with PE burden. Consistent with clinical data, dabigatran, a DTI, acutely decreases thrombus stability and increases PE burden compared with LMWH or saline, which is a FXIII-dependent effect.
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Affiliation(s)
- S A Shaya
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Canada
- Department of Medical Sciences, McMaster University, Hamilton, Canada
| | - L J Saldanha
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Canada
- Department of Medical Sciences, McMaster University, Hamilton, Canada
| | - N Vaezzadeh
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Canada
- Department of Medical Sciences, McMaster University, Hamilton, Canada
| | - J Zhou
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Canada
| | - R Ni
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Canada
- Department of Medical Sciences, McMaster University, Hamilton, Canada
| | - P L Gross
- Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Canada
- Department of Medical Sciences, McMaster University, Hamilton, Canada
- Department of Medicine, McMaster University, Hamilton, Canada
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Chen L, Ni R. The anti-tumor effect of polymethylmethacrylate cement on vertebral tumor of rabbit after percutaneous vertebroplasty. J Vasc Interv Radiol 2015. [DOI: 10.1016/j.jvir.2014.12.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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He J, Chaparro A, Nguyen B, Burge RJ, Crandall J, Chaparro B, Ni R, Cao S. Texting while driving: is speech-based text entry less risky than handheld text entry? Accid Anal Prev 2014; 72:287-295. [PMID: 25089769 DOI: 10.1016/j.aap.2014.07.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [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: 11/30/2013] [Revised: 07/13/2014] [Accepted: 07/13/2014] [Indexed: 06/03/2023]
Abstract
Research indicates that using a cell phone to talk or text while maneuvering a vehicle impairs driving performance. However, few published studies directly compare the distracting effects of texting using a hands-free (i.e., speech-based interface) versus handheld cell phone, which is an important issue for legislation, automotive interface design and driving safety training. This study compared the effect of speech-based versus handheld text entries on simulated driving performance by asking participants to perform a car following task while controlling the duration of a secondary text-entry task. Results showed that both speech-based and handheld text entries impaired driving performance relative to the drive-only condition by causing more variation in speed and lane position. Handheld text entry also increased the brake response time and increased variation in headway distance. Text entry using a speech-based cell phone was less detrimental to driving performance than handheld text entry. Nevertheless, the speech-based text entry task still significantly impaired driving compared to the drive-only condition. These results suggest that speech-based text entry disrupts driving, but reduces the level of performance interference compared to text entry with a handheld device. In addition, the difference in the distraction effect caused by speech-based and handheld text entry is not simply due to the difference in task duration.
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Affiliation(s)
- J He
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA.
| | - A Chaparro
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA
| | - B Nguyen
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA
| | - R J Burge
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA
| | - J Crandall
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA
| | - B Chaparro
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA
| | - R Ni
- Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260, USA
| | - S Cao
- Department of Systems Design Engineering, University of Waterloo, Waterloo N2L 3G1, Canada
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9
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Nguyen B, Ni R. The relationship between low-level visual tasks and steering control. J Vis 2014. [DOI: 10.1167/14.10.1354] [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] Open
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10
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Plummer JP, Ni R. Is High Contrast Viewing Condition Always Better? Not for The Useful Field of View Tests. J Vis 2014. [DOI: 10.1167/14.10.541] [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] Open
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11
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Vaezzadeh N, Ni R, Kim PY, Weitz JI, Gross PL. Comparison of the effect of coagulation and platelet function impairments on various mouse bleeding models. Thromb Haemost 2014; 112:412-8. [PMID: 24696126 DOI: 10.1160/th13-11-0919] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 03/08/2014] [Indexed: 01/21/2023]
Abstract
Haemostatic impairments are studied in vivo using one of several murine bleeding models. However it is not known whether these models are equally appropriate for assessing coagulation or platelet function defects. It was our study objective to assess the performance of arterial, venous and combined arterial and venous murine bleeding models towards impaired coagulation or platelet function. Unfractionated heparin (UFH) or αIIbβ3inhibitory antibody (Leo.H4) were administered to mice, and their effects on bleeding in saphenous vein, artery, and tail tip transection models were quantified and correlated with their effects on plasma clotting and ADP-induced platelet aggregation, respectively. All models exhibited similar sensitivity with UFH (EC50 dose = 0.19, 0.13 and 0.07 U/g, respectively) (95% CI = 0.14 - 0.27, 0.08 - 0.20, and 0.03 - 0.16 U/g, respectively). Maximal inhibition of ex vivo plasma clotting could be achieved with UFH doses as low as 0.03 U/g. In contrast, the saphenous vein bleeding model was less sensitive to αIIbβ3 inhibition (EC50 = 6.9 μg/ml) than tail transection or saphenous artery bleeding models (EC50 = 0.12 and 0.37 μg/ml, respectively) (95% CI = 2.4 - 20, 0.05 - 0.33, and 0.06 - 2.2 μg/ml, respectively). The EC50 of Leo.H4 for ADP-induced platelet aggregation in vitro (8.0 μg/ml) was at least 20-fold higher than that of the tail and arterial, but not the venous bleeding model. In conclusion, venous, arterial and tail bleeding models are similarly affected by impaired coagulation, while platelet function defects have a greater influence in models incorporating arterial injury.
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Affiliation(s)
| | | | | | | | - P L Gross
- Dr. Peter L. Gross, Thrombosis and Atherosclerosis Research Institute, 237 Barton St East, Hamilton, Ontario, L8L 2X2 Canada, E-mail:
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12
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Nguyen B, Zhuo Y, Ni R. The relationship between performance on 2D shape perception and steering control. J Vis 2013. [DOI: 10.1167/13.9.954] [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] Open
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13
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Persinger J, Ni R. The Interaction of Changing Disparity and Interocular Velocity Difference in Motion in Depth Perception. J Vis 2013. [DOI: 10.1167/13.9.1185] [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] Open
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14
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Liu J, Ye Y, Dong Z, Liu Y, Ni R, Zheng L. Anesthesia management for open fetal intrauterine surgery. CLIN EXP OBSTET GYN 2013; 40:403-406. [PMID: 24283175] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
OBJECTIVE Open fetal surgery is usually performed during the second trimester in a fetus suffering from severe congenital diseases, thus enabling the pregnancy to continue until delivery. MATERIALS AND METHODS The key of this treatment is to promote uterine relaxation enough to maintain both maternal and fetal circulation stable and once surgery is completed, to offer a perfect analgesic to avoid the contractions due to pain, and finally to reduce preterm delivery. RESULTS Successful anesthesia is fundamental to this surgery. CONCLUSION The authors have performed three cases under inhalation anesthesia combined with successful epidural anesthesia.
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Affiliation(s)
- J Liu
- Department of Anesthesiology, Foshan Children and Maternal Hospital, Foshan, Guangdong Province, China.
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Arthur JF, Shen Y, Chen Y, Qiao J, Ni R, Lu Y, Andrews RK, Gardiner EE, Cheng J. Exacerbation of glycoprotein VI-dependent platelet responses in a rhesus monkey model of Type 1 diabetes. J Diabetes Res 2013; 2013:370212. [PMID: 23841102 PMCID: PMC3690249 DOI: 10.1155/2013/370212] [Citation(s) in RCA: 10] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 05/07/2013] [Indexed: 11/17/2022] Open
Abstract
Thrombosis is a life-threatening complication of diabetes. Platelet reactivity is crucial to thrombus formation, particularly in arterial vessels and in thrombotic complications causing myocardial infarction or ischaemic stroke, but diabetic patients often respond poorly to current antiplatelet medication. In this study, we used a nonhuman primate model of Type 1 diabetes to measure early downstream signalling events following engagement of the major platelet collagen receptor, glycoprotein (GP)VI. Diabetic monkeys were given enough insulin to maintain their blood glucose levels either at ~8 mM (well-controlled diabetes) or ~15 mM (poorly controlled diabetes). Flow cytometric analysis was used to measure platelet reactive oxygen species (ROS) generation, calcium mobilisation, receptor surface expression, and immature platelet fraction. We observed exacerbated intracellular ROS and calcium flux associated with engagement of GPVI in monkeys with poorly controlled diabetes. GPVI surface levels did not differ between healthy monkeys or the two diabetic groups. Treatment of platelets with the specific Syk inhibitor BAY61-3606 inhibited GPVI-dependent ROS and, importantly, reduced ROS generation in the poorly controlled diabetes group to that observed in healthy monkeys. These data indicate that glycaemic control is important in reducing GPVI-dependent platelet hyperreactivity and point to a potential antithrombotic therapeutic benefit of Syk inhibition in hyperglycaemic diabetes.
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Affiliation(s)
- J. F. Arthur
- Australian Centre for Blood Diseases, Alfred Medical Research & Education Precinct (AMREP), Monash University, Melbourne, VIC 3004, Australia
- *J. F. Arthur: and
| | - Y. Shen
- Australian Centre for Blood Diseases, Alfred Medical Research & Education Precinct (AMREP), Monash University, Melbourne, VIC 3004, Australia
| | - Y. Chen
- Key Laboratory of Transplant Engineering and Immunology, West China Hospital, Ministry of Health, Sichuan University, Chengdu 610041, China
| | - J. Qiao
- Australian Centre for Blood Diseases, Alfred Medical Research & Education Precinct (AMREP), Monash University, Melbourne, VIC 3004, Australia
| | - R. Ni
- Key Laboratory of Transplant Engineering and Immunology, West China Hospital, Ministry of Health, Sichuan University, Chengdu 610041, China
| | - Y. Lu
- Key Laboratory of Transplant Engineering and Immunology, West China Hospital, Ministry of Health, Sichuan University, Chengdu 610041, China
- *Y. Lu:
| | - R. K. Andrews
- Australian Centre for Blood Diseases, Alfred Medical Research & Education Precinct (AMREP), Monash University, Melbourne, VIC 3004, Australia
| | - E. E. Gardiner
- Australian Centre for Blood Diseases, Alfred Medical Research & Education Precinct (AMREP), Monash University, Melbourne, VIC 3004, Australia
| | - J. Cheng
- Key Laboratory of Transplant Engineering and Immunology, West China Hospital, Ministry of Health, Sichuan University, Chengdu 610041, China
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Persinger J, Ni R. Temporal Characteristics of Stereomotion Direction Perception. J Vis 2012. [DOI: 10.1167/12.9.223] [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] Open
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17
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Nguyen B, Ni R. Effects of contrast on spatial and temporal integration in 2D shape perception from dynamic occlusion. J Vis 2012. [DOI: 10.1167/12.9.885] [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] Open
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18
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Rand ML, Wang H, Pluthero FG, Stafford AR, Ni R, Vaezzadeh N, Allison AC, Kahr WHA, Weitz JI, Gross PL. Diannexin, an annexin A5 homodimer, binds phosphatidylserine with high affinity and is a potent inhibitor of platelet-mediated events during thrombus formation. J Thromb Haemost 2012; 10:1109-19. [PMID: 22463102 DOI: 10.1111/j.1538-7836.2012.04716.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Shielding of procoagulant phosphatidylserine (PS) with annexin A5 attenuates thrombosis, but annexin A5 (35.7 kDa) is rapidly cleared from the circulation. In contrast, Diannexin, a 73.1 kDa homodimer of annexin A5, has an extended half-life. OBJECTIVES To quantify the affinity of Diannexin for PS, examine its interaction with activated platelets and determine its effects on platelet-mediated events during thrombus formation. METHODS The affinities of Diannexin and annexin A5 for PS-containing lipid bilayers were compared using surface plasmon resonance, and binding to activated platelets was assessed by flow cytometry. Calibrated automated thrombography and thromboelastography were employed to study the effects of Diannexin on thrombin generation and platelet-fibrin clot formation, respectively, whereas intravital videomicroscopy was used to examine its effect on platelet accumulation and activation after laser-induced injury to murine cremaster arterioles, and a tail tip bleeding model was used to explore its effects on hemostasis. RESULTS Diannexin and annexin A5 bind PS with K(D) values of 0.6 and 5 nm, respectively, and both bind to the same subpopulation of PS-exposing platelets. Diannexin inhibited thrombin generation and platelet-fibrin clot formation in vitro at 10 nm (P<0.05-0.001 compared with control), and reduced platelet accumulation at 1 μg g(-1) (P<0.05) and activation at 0.25 μg g(-1) (P<0.001) in experimentally induced arterial thrombi in mice while increasing blood loss at 1 μg g(-1) (P<0.01). CONCLUSIONS Diannexin binds to PS with high affinity and is a potent inhibitor of platelet-mediated events during thrombus formation.
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Affiliation(s)
- M L Rand
- Division of Haematology/Oncology, The Hospital for Sick Children, Toronto, Canada.
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19
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Chen L, Ni R. Abstract No. 189: Osteolytic, osteoblastic and mixed spinal metastases: evaluation of the analgesic efficacy of percutaneous vertebroplasty. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.236] [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: 10/28/2022] Open
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20
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Chen L, Ni R. Abstract No. 182: Clinical outcomes with hemivertebral filling during percutaneous vertebroplasty for treatment of metastaic spinal lesion. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.229] [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: 10/28/2022] Open
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21
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Filion L, Hermes M, Ni R, Vermolen ECM, Kuijk A, Christova CG, Stiefelhagen JCP, Vissers T, van Blaaderen A, Dijkstra M. Self-assembly of a colloidal interstitial solid with tunable sublattice doping. Phys Rev Lett 2011; 107:168302. [PMID: 22107433 DOI: 10.1103/physrevlett.107.168302] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Indexed: 05/31/2023]
Abstract
We determine the phase diagram of a binary mixture of small and large hard spheres with a size ratio of 0.3 using free-energy calculations in Monte Carlo simulations. We find a stable binary fluid phase, a pure face-centered-cubic (fcc) crystal phase of the small spheres, and binary crystal structures with LS and LS(6) stoichiometries. Surprisingly, we demonstrate theoretically and experimentally the stability of a novel interstitial solid solution in binary hard-sphere mixtures, which is constructed by filling the octahedral holes of an fcc crystal of large spheres with small spheres. We find that the fraction of octahedral holes filled with a small sphere can be completely tuned from 0 to 1. Additionally, we study the hopping of the small spheres between neighboring octahedral holes, and interestingly, we find that the diffusion increases upon increasing the density of small spheres.
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Affiliation(s)
- L Filion
- Soft Condensed Matter, Debye Institute for NanoMaterials Science, Utrecht University, Utrecht, the Netherlands
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22
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23
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Nguyen B, Ni R. Age-Related Differences in Steering Control under Deteriorated Optical Flow Conditions. J Vis 2011. [DOI: 10.1167/11.11.907] [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] Open
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24
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Teves J, Ni R. Age-related differences in detection of collision events on linear trajectories. J Vis 2011. [DOI: 10.1167/11.11.905] [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] Open
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Filion L, Ni R, Frenkel D, Dijkstra M. Simulation of nucleation in almost hard-sphere colloids: The discrepancy between experiment and simulation persists. J Chem Phys 2011; 134:134901. [DOI: 10.1063/1.3572059] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Chen L, Ni R. Abstract No. 305: Percutaneous vertebroplasty performed by the unilateral transpedicular method. J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Ni R, Ding W, Li M. Abstract No. 355: Interventional treatment of giant splenic artery aneurysms: Experience with 12 cases. J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.391] [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: 11/29/2022] Open
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Ni R, Chen L, Yang C. Abstract No. 197: The complications and speculation about the mechanism of production after percutaneous kyphoplasty (with analysis of 175 cases). J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.217] [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: 11/17/2022] Open
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Filion L, Hermes M, Ni R, Dijkstra M. Crystal nucleation of hard spheres using molecular dynamics, umbrella sampling, and forward flux sampling: A comparison of simulation techniques. J Chem Phys 2010; 133:244115. [DOI: 10.1063/1.3506838] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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30
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Yotsumoto Y, Ni R, Chang LH, Sasaki Y, Watanabe T, Andersen G. Aging and perceptual learning. J Vis 2010. [DOI: 10.1167/9.8.861] [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] Open
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31
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Yotsumoto Y, Chang LH, Ni R, Salat D, Andersen G, Watanabe T, Sasaki Y. Perceptual learning and changes in white matter in the aged brain revealed by diffusion-tensor imaging (DTI). J Vis 2010. [DOI: 10.1167/10.7.912] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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32
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Ni R. The effect of local matching on perceived slant in stereopsis. J Vis 2010. [DOI: 10.1167/10.7.369] [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] Open
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33
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Ni R, Andersen G. Propagation of depth from temporal inter-ocular unmatched features and binocular information. J Vis 2010. [DOI: 10.1167/8.6.94] [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] Open
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34
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Bower JD, Ni R, Andersen GJ. Age-related decrements in the discrimination of global coherent motion. J Vis 2010. [DOI: 10.1167/6.6.637] [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] Open
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35
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Guindon A, Ni R, Bian Z, Andersen G. The effects of fog and aging on the ability to detect collisions. J Vis 2010. [DOI: 10.1167/9.8.1062] [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] Open
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36
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Ni R, Bian Z, Andersen J. Age-related differences in the use of optical flow and landmark information in steering control. J Vis 2010. [DOI: 10.1167/9.8.1063] [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] Open
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37
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Bower JD, Zheng B, Ni R, Andersen GJ. The effect of retinal eccentricity on the discrimination of global motion direction. J Vis 2010. [DOI: 10.1167/8.6.1024] [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] Open
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38
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Ni R, Chen L, Andersen GJ. Illusory contours formed by temporal interocular unmatched features. J Vis 2010. [DOI: 10.1167/6.6.332] [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] Open
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39
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Ni R, Andersen GJ, Lin Y. Spatio-temporal integration, kinetic occlusion and aging. J Vis 2010. [DOI: 10.1167/5.8.664] [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] Open
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40
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Bower JD, Ni R, Andersen GJ. Aging and the detection of motion direction in random-dot stimuli. J Vis 2010. [DOI: 10.1167/5.8.663] [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] Open
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Ni R, Braunstein ML, Andersen GJ. Interactions of motion parallax and ground contact in specifying distance in a 3-D scene. J Vis 2010. [DOI: 10.1167/3.9.17] [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] Open
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Long C, Ni R. Abstract No. 284: An intravertebral tumor model in rabbits created by transplantation of VX2 carcinoma via percutaneous puncture technique under CT guidance. J Vasc Interv Radiol 2010. [DOI: 10.1016/j.jvir.2009.12.071] [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: 10/19/2022] Open
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45
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Ni R, Chen L, Yang H, Xu B, Tang T. Abstract No. 184: Comparison of Percutaneous Vertebroplasty and Kyphoplasty in Treatment of Painful Vertebral Compression Fractures. J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Abstract
BACKGROUND We recently demonstrated that platelet aggregation occurred in fibrinogen-deficient mice. In these animals, platelet fibronectin (Fn) content was increased 3-5 fold, suggesting that Fn may also be involved in platelet aggregation. METHODS AND RESULTS We compared platelet Fn content from a severe hypofibrinogenemic patient (with approximately 0.5% of normal fibrinogen levels) with his parents (heterozygous) and healthy donors. A significant increase in the patient's platelet Fn content was detected by immunoblot, flow cytometry, and immunoelectron microscopy (IEM). To examine the possible contribution of platelet Fn to platelet aggregation, we examined cell-surface Fn expression after thrombin treatment. Unexpectedly, IEM detected only trace amounts of Fn retained on the patient's platelet surface, and flow cytometry indicated that surface Fn was approximately 6-fold lower than that of his parents and tenfold lower than that of healthy donors. An ELISA further confirmed that the patient's platelet Fn was primarily released into the extracellular medium. To test whether retention of surface Fn was due to fibrin formation on the platelet surface, an antifibrin antibody (T2 G1) was employed. Fibrin was detected on platelets from healthy donors and from the father, but was negligible on the patient's platelets. Consistent with these data, when gel-filtered platelets of healthy donors were treated with thrombin receptor activation peptide (SFLLRN-NH(2); no conversion of fibrinogen to fibrin), little surface Fn was detected. CONCLUSION Fibrinogen not only competitively inhibits human platelet Fn internalization but also controls platelet-surface Fn retention via fibrin formation. The Fn-fibrin interaction is one possible mechanism to promote Fn interaction with platelets.
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Affiliation(s)
- Z Zhai
- The Center Laboratory, and Department of Hematology of Anhui Provincial Hospital, the Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China.
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Ni R, Ihara K, Miyako K, Takemoto M, Ishimura M, Kohno H, Matsuura N, Yoshimura A, Hara T. Association study of polymorphisms in SOCS family genes with type 1 diabetes mellitus. Int J Immunogenet 2006; 33:7-10. [PMID: 16426235 DOI: 10.1111/j.1744-313x.2006.00563.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Suppressors of cytokine signalling (SOCS) proteins play important roles in the negative regulation of cytokine signal. We first searched for polymorphisms in SOCS-1, SOCS-3 and SOCS-5 genes, and examined the association of the polymorphisms with type 1 diabetes (T1D). As a result, we did not find any significant associations between SOCS genes and T1D.
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Affiliation(s)
- R Ni
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Japan
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48
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Ni R, Braunstein ML, Andersen GJ. Interaction of optical contact, shadows and motion in determining perceived scene layout. J Vis 2004. [DOI: 10.1167/4.8.615] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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49
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Abstract
When two lines of different orientations are combined in regular stereograms, the orientation of the resulting line is different from those of the monocular lines. In this study we investigate the percept elicited by orientation disparity in Panum's limiting case. A variant of Panum's limiting case was designed to include orientation disparity. The single line in one half-image tilted leftwards. One of the double lines in the other half-image was parallel to the single line, while the other one tilted rightwards with obliquity one third that of the single line. In this stimulus configuration, if the single line in one half-image fuses with both lines in the other half-image at the same time, both of the two lines perceived after fusion should tilt leftwards. If double fusion does not happen, the two lines should tilt leftwards and rightwards respectively. The results of this study are in agreement with the latter prediction, which implies that double fusion does not occur in this variant of Panum's limiting case.
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Affiliation(s)
- Z Wang
- Laboratory of Visual Information Processing, Institute of Biophysics, Chinese Academy of Sciences, Beijing, People's Republic of China
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Abstract
In rats and baboons, the hepatotoxicity of chronic ethanol consumption is exacerbated by beta-carotene feeding, but the mechanism of this adverse effect is unknown. In this study, the toxicity of beta-carotene and acetaldehyde was documented by the MTT test (an assay of reduction of tetrazolium to formazan) and by lactate dehydrogenase (LDH) leakage. In HepG2 cells, beta-carotene or acetaldehyde inhibited mitochondrial reduction function as indicated by a decrease of the MTT test. beta-Carotene was inhibitory at very low concentration, in a dose-dependent manner. The combination of these two compounds resulted in an additive effect. Acetaldehyde increased LDH leakage from the HepG2 cells into the medium, whereas beta-carotene by itself did not show such an effect, but it exacerbated the toxicity of acetaldehyde when combined. In addition, this study showed that acetaldehyde and beta-carotene inhibited each other's clearance from the medium, which suggests that these two chemicals may share, at least in part, a common metabolic pathway (possibly via aldehyde dehydrogenase) in the cells, and that a competitive inhibition may exist. In conclusion, this preliminary study indicates that beta-carotene is toxic to hepatocytes, especially when combined with acetaldehyde, the metabolite of ethanol.
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Affiliation(s)
- R Ni
- Liver Disease & Nutrition Section, Veterans Affairs Medical Center & Mount Sinai School of Medicine, Bronx, NY 10468-3992, USA
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