101
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Wang H, Sun N, Huo Y. P243Glucose metabolism and blood pressure control status in professional hypertension clinics in China. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu082.175] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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102
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Sun N, Han W, Zhao L, Liu X, Chen Y, Wang H. P257Relationship between 24h urinary sodium with blood pressure, arterial elasticity and urine protein in hypertensive patients. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu082.188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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103
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Xi Y, Sun N, Zhao L, Wang H, Chen Y, Liu X, Han W. P256Research of the spot urine method in estimating 24-hour urinary sodium in hypertensive patients. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu082.187] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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104
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Mac Dowell N, Llovell F, Sun N, Hallett JP, George A, Hunt PA, Welton T, Simmons BA, Vega LF. New Experimental Density Data and Soft-SAFT Models of Alkylimidazolium ([CnC1im]+) Chloride (Cl–), Methylsulfate ([MeSO4]−), and Dimethylphosphate ([Me2PO4]−) Based Ionic Liquids. J Phys Chem B 2014; 118:6206-21. [DOI: 10.1021/jp501619y] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- N. Mac Dowell
- Centre
for Environmental Policy, Imperial College London, London SW7 1NA, United Kingdom
| | - F. Llovell
- MATGAS Research Center, Campus
de la UAB, Bellaterra, Barcelona 08193, Spain
| | - N. Sun
- Joint
BioEnergy Institute, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Emeryville, California 94608, United States
- Biomass
Science and Conversion Technology Department, Sandia National Laboratories, Livermore, California 94550, United States
| | | | - A. George
- Joint
BioEnergy Institute, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Emeryville, California 94608, United States
- Biomass
Science and Conversion Technology Department, Sandia National Laboratories, Livermore, California 94550, United States
| | | | | | - B. A. Simmons
- Joint
BioEnergy Institute, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Emeryville, California 94608, United States
- Biomass
Science and Conversion Technology Department, Sandia National Laboratories, Livermore, California 94550, United States
| | - L. F. Vega
- MATGAS Research Center, Campus
de la UAB, Bellaterra, Barcelona 08193, Spain
- Carburos Metálicos/Air Products Group, C/Aragón, 300, 08009 Barcelona, Spain
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105
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Sun T, Sun N, Wang J, Tan S. SU-F-18C-14: Hessian-Based Norm Penalty for Weighted Least-Square CBCT Reconstruction. Med Phys 2014. [DOI: 10.1118/1.4889099] [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: 11/07/2022] Open
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106
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Sun T, Liu Y, Sun N, Mistry N, Tan S. SU-D-12A-05: Iterative Reconstruction Techniques to Enable Intrinsic Respiratory Gated CT in Mice. Med Phys 2014. [DOI: 10.1118/1.4887929] [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: 11/07/2022] Open
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107
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Huber K, Aichler M, Sun N, Buck A, Li Z, Fernandez IE, Hauck SM, Zitzelsberger H, Eickelberg O, Janssen KP, Keller U, Walch A. A rapid ex vivo tissue model for optimising drug detection and ionisation in MALDI imaging studies. Histochem Cell Biol 2014; 142:361-71. [DOI: 10.1007/s00418-014-1223-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2014] [Indexed: 12/25/2022]
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108
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Wang Y, Sun N, Cheng Z, Tong L. Optimal time to use low molecular weight heparin on prethrombotic state of rat chronic obstructive pulmonary disease model. Chin Med J (Engl) 2014; 127:518-521. [PMID: 24451960] [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: 06/03/2023] Open
Abstract
BACKGROUND Low molecular weight heparin (LMWH), as one of anticoagulant drugs, has been used for the treatment of chronic obstructive pulmonary disease (COPD) with prethrombotic state, but the specific use time is unclear. The aim of the study is to observe the effect of LMWH at two different periods of prethrombotic state in COPD in rats and to find the optimal time to use LMWH. METHODS Forty Wistar rats were randomly divided into 4 groups: normal control, raised for 55 days without any treatment; COPD control without LMWH, cigarette inhalation plus intratracheal instillation of lipopolysaccharide and hypodermic injection of normal saline once a day for 10 days; COPD control given LMWH 150 U/kg subcutaneous injection, once a day for 10 days starting day 15 (LMWH-d15); COPD control given LMWH 150 U/kg subcutaneous injection, once a day for 10 days starting day 29 (LMWH-d29). RESULTS Comparing LMWH-d15 with LMWH-d29, plasma viscosity, whole blood viscosity, von Willebrand factor, serum fibrinogen, plasminogen activator inhibitor-1 and fibrin D-dimer were each significantly reduced; but thrombin plasminogen activator increased significantly whilst arterial PO2 and PCO2 improved significantly. CONCLUSION The better time to use LMWH is the time when coagulation and fibrinolytic indices begin to change in COPD.
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Affiliation(s)
- Yanqing Wang
- Department of Respiratory Diseases, Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong 266101, China
| | - Nina Sun
- Department of Respiratory Diseases, Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong 266101, China
| | - Zhaozhong Cheng
- Department of Respiratory Diseases, Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong 266101, China.
| | - Li Tong
- Department of Respiratory Diseases, Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong 266101, China
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Sun N, Hao JR, Li XY, Yin XH, Zong YY, Zhang GY, Gao C. GluR6-FasL-Trx2 mediates denitrosylation and activation of procaspase-3 in cerebral ischemia/reperfusion in rats. Cell Death Dis 2013; 4:e771. [PMID: 23949220 PMCID: PMC3763460 DOI: 10.1038/cddis.2013.299] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 07/10/2013] [Accepted: 07/15/2013] [Indexed: 11/16/2022]
Abstract
Global cerebral ischemia/reperfusion (I/R) facilitates the activation of procaspase-3 and promotes apoptosis in hippocampus. But the mechanisms have remained uncharacterized. Protein S-nitrosylation and denitrosylation is an important reversible posttranslational modification, which is a common mechanism in signal transduction and affects numerous physiological and pathophysiological events. However, it is not known whether S-nitrosylation/denitrosylation modification of procaspase-3 serves as a component of apoptosis and cell death induced by cerebral I/R. Here we show that procaspase-3 is significantly denitrosylated and activated after I/R in rat hippocampus. NS102, a glutamate receptor 6 (GluR6) antagonist, can inhibit the denitrosylation of procaspase-3 and diminish the increased Fas ligand (FasL) and thioredoxin (Trx)-2 expression induced by cerebral I/R. Moreover, downregulation of FasL expression by antisense oligodeoxynucleotides inhibits the denitrosylation and activation of procaspase-3. Auranofin, a TrxR inhibitor or TrxR2 antisense oligodeoxynucleotide, has similar effects. In primary hippocampal cultures, Lentiviral-mediated knockdown of FasL and TrxR2 before the oxygen and glucose deprivation/reoxygenation further verifies that FasL and TrxR2 are involved in the denitrosylation of procaspase-3. In situ TUNEL staining and cresyl violet staining validate that inhibiting denitrosylation of procaspase-3 may exert neuroprotective effect on apoptosis and cell death induced by cerebral I/R in hippocampal CA1 pyramidal neurons. This is the first evidence that cerebral I/R mediates procaspase-3 denitrosylation and activation through GluR6-FasL-Trx2 pathway, which leads to neuronal apoptosis and cell death.
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Affiliation(s)
- N Sun
- Jiangsu Key Laboratory of Anesthesiology, Xuzhou Medical College, Jiangsu 221004, China
| | - J-R Hao
- Jiangsu Key Laboratory of Anesthesiology, Xuzhou Medical College, Jiangsu 221004, China
| | - X-Y Li
- Research Center for Biochemistry and Molecular Biology, Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical College, 209 Tongshan Road, Jiangsu 221004, China
| | - X-H Yin
- Research Center for Biochemistry and Molecular Biology, Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical College, 209 Tongshan Road, Jiangsu 221004, China
| | - Y-Y Zong
- Research Center for Biochemistry and Molecular Biology, Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical College, 209 Tongshan Road, Jiangsu 221004, China
| | - G-Y Zhang
- Research Center for Biochemistry and Molecular Biology, Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical College, 209 Tongshan Road, Jiangsu 221004, China
| | - C Gao
- Jiangsu Key Laboratory of Anesthesiology, Xuzhou Medical College, Jiangsu 221004, China
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110
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Zhang ZY, Wang LQ, Fu CF, Li X, Cui ZL, Zhang JY, Xue SH, Sun N, Xu F. Combination of targeting gene-viro therapy with recombinant Fowl-pox viruses with HN and VP3 genes on mouse osteosarcoma. Eur Rev Med Pharmacol Sci 2013; 17:767-776. [PMID: 23609360] [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: 06/02/2023]
Abstract
BACKGROUND Osteosarcoma is an aggressive cancerous neoplasm arising from primitive transformed cells of mesenchymal origin that exhibit osteoblastic differentiation and produce malignant osteoid. With the rapid development of tumor molecular biology, gene and viral therapy, a highly promising strategy for the treatment, has shown some therapeutic effects. OBJECTIVES To study the strategy of cooperative cancer gene therapy, previously, we explored the antitumor effects of recombinant Fowl-pox viruses (FPVs) with both HN (hemagglutinin-neuramidinase) and VP3 genes on mouse osteosarcoma. MATERIALS AND METHODS We constructed vFV-HN, vFV-VP3 and vFV-HN-VP3 inserting CAV VP3 gene, NDV HN gene into fowlpox virus. S180 osteosarcoma were transfected with Recombinant Fowl-pox viruses (FPVs). These cell lines stably expressing tagged proteins were selected by culturing in medium containing puromycin (2 µg/ml) and confirmed by immunoblotting and immunostaining. S180 osteosarcoma model with BALB/c mice and nude mice were established and the vFPV viruses as control, vFV-HN, vFV-VP3, vFV-HN-VP3 were injected into the tumor directly. The rate of tumor growth, tumor suppression and the sialic acid levels in serum were examined and the tumor tissues were analyzed by the method of immunohistochemistry. Flow cytometric analysis was performed using a FACSCalibur flow cytometer. A total of 100,000 events were analyzed for each sample and the experiment was repeated at least twice. RESULTS Our data indicated that vFV-HN, vFV-VP3 and vFV-HN-VP3 all had growth inhibition effects, the inhibition rate of vFV-HN-VP3 group was 51.7%, which was higher than that of vFV-HN, vFV-VP3 group and control group (p < 0.01). The sialic acid level of vFV-HN-VP3 group in mouse serum was 4.22±0.27 mmol/l, which was lower than that of other groups (p < 0.01). CONCLUSIONS These results suggest that genes into mouse osteosarcoma cancer cells can cause cell a specificity anti-tumor immune activity, suppress tumor growth, and increase the survival rate of the tumor within host.
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Affiliation(s)
- Z-Y Zhang
- The 4th Affiliate Hospital of China Medical University, Shenyang, China.
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111
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Bi B, Xiao X, Zhang H, Gao J, Tao M, Niu H, Wang Y, Wang Q, Chen C, Sun N, Li K, Fu J, Gan Z, Sang W, Zhang G, Yang L, Tian T, Li Q, Yang Q, Sun L, Li Y, Rong H, Guan C, Zhao X, Ye D, Zhang Y, Ma Z, Li H, He K, Chen J, Cai Y, Zhou C, Luo Y, Wang S, Gao S, Liu J, Guo L, Guan J, Kang Z, Di D, Li Y, Shi S, Li Y, Chen Y, Flint J, Kendler K, Liu Y. A comparison of the clinical characteristics of women with recurrent major depression with and without suicidal symptomatology. Psychol Med 2012; 42:2591-2598. [PMID: 22716960 PMCID: PMC3488812 DOI: 10.1017/s003329171200058x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Revised: 03/02/2012] [Accepted: 03/06/2012] [Indexed: 11/22/2022]
Abstract
BACKGROUND The relationship between recurrent major depression (MD) in women and suicidality is complex. We investigated the extent to which patients who suffered with various forms of suicidal symptomatology can be distinguished from those subjects without such symptoms. METHOD We examined the clinical features of the worst episode in 1970 Han Chinese women with recurrent DSM-IV MD between the ages of 30 and 60 years from across China. Student's t tests, and logistic and multiple logistic regression models were used to determine the association between suicidality and other clinical features of MD. RESULTS Suicidal symptomatology is significantly associated with a more severe form of MD, as indexed by both the number of episodes and number of MD symptoms. Patients reporting suicidal thoughts, plans or attempts experienced a significantly greater number of stressful life events. The depressive symptom most strongly associated with lifetime suicide attempt was feelings of worthlessness (odds ratio 4.25, 95% confidence interval 2.9-6.3). Excessive guilt, diminished concentration and impaired decision-making were also significantly associated with a suicide attempt. CONCLUSIONS This study contributes to the existing literature on risk factors for suicidal symptomatology in depressed women. Identifying specific depressive symptoms and co-morbid psychiatric disorders may help improve the clinical assessment of suicide risk in depressed patients. These findings could be helpful in identifying those who need more intense treatment strategies in order to prevent suicide.
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Affiliation(s)
- B. Bi
- The First Hospital of China Medical University, Shenyang, People's Republic of China (PRC)
| | - X. Xiao
- The First Hospital of China Medical University, Shenyang, People's Republic of China (PRC)
| | - H. Zhang
- The First Hospital of China Medical University, Shenyang, People's Republic of China (PRC)
| | - J. Gao
- ZheJiang Traditional Chinese Medical Hospital, Hangzhou, PRC
| | - M. Tao
- Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, PRC
| | - H. Niu
- No. 1 Hospital of Zhengzhou University, Zhengzhou, PRC
| | - Y. Wang
- Shandong Mental Health Center, Shan Dong, PRC
| | - Q. Wang
- Beijing Anding Hospital, Capital Medical University, Beijing, PRC
| | - C. Chen
- No. 1 Hospital of Medical College of Xian Jiaotong University, Xian, Shaan Xi, PRC
| | - N. Sun
- No. 1 Hospital of Shanxi Medical University, Shanxi, PRC
| | - K. Li
- Mental Hospital of Jiangxi Province, Jiangxi, PRC
| | - J. Fu
- ShengJing Hospital of China Medical University, Liaoning, PRC
| | - Z. Gan
- No. 3 Affiliated Hospital of Zhongshan University, Guangdong, PRC
| | - W. Sang
- Hebei Mental Health Center, Hebei, PRC
| | - G. Zhang
- No. 4 Affiliated Hospital of Jiangsu University, Jiang Su, PRC
| | - L. Yang
- Jilin Brain Hospital, Jilin, PRC
| | - T. Tian
- Tianjin Anding Hospital, Tianjin, PRC
| | - Q. Li
- No. 1 Mental Health Center Affiliated Harbin Medical University, Heilongjiang, PRC
| | - Q. Yang
- Chongqing Mental Health Center, Chongqing, PRC
| | - L. Sun
- Psychiatric Hospital of Henan Province, Henan, PRC
| | - Ying Li
- Dalian No. 7 People's Hospital and Dalian Mental Health Center, Dalian, PRC
| | - H. Rong
- Shenzhen Kangning Hospital, Shenzhen, PRC
| | - C. Guan
- Nanjing Brain Hospital, Jiang Su, PRC
| | - X. Zhao
- The First Hospital of Hebei Medical University, Shijiazhuang, PRC
| | - D. Ye
- Sichuan Mental Health Center, Sichuan, PRC
| | - Y. Zhang
- Lanzhou University Second Hospital, Second Clinical Medical College of Lanzhou University, Gansu Province, PRC
| | - Z. Ma
- No. 1 Hospital of Chongqing Medical University, Chongqing, PRC
| | - H. Li
- Mental Health Center of West China Hospital of Sichuan University, Si Chuan, PRC
| | - K. He
- Shanghai Tongji University Affiliated Tongji Hospital, Shanghai, PRC
| | - J. Chen
- Shanghai Jiao Tong University School of Medicine Affiliated Shanghai Mental Health Center, Shanghai, PRC
| | - Y. Cai
- Fudan University Affiliated Huashan Hospital, Shanghai, PRC
| | - C. Zhou
- Wuhan Mental Health Center, Hubei, PRC
| | - Y. Luo
- No. 3 Hospital of Heilongjiang Province, Heilongjiang, PRC
| | - S. Wang
- The First Affiliated Hospital of Jinan University, Guangzhou, PRC
| | - S. Gao
- Ningbo Kangning Hospital, Zhejiang, PRC
| | - J. Liu
- Suzhou Guangji Hospital, Jiangsu, PRC
| | - L. Guo
- The Fourth Military Medical University Affiliated Xijing Hospital, Shaanxi, PRC
| | - J. Guan
- Guangzhou Brain Hospital/Guangzhou Psychiatric Hospital, Guangzhou, PRC
| | - Z. Kang
- No. 4 People's Hospital of Liaocheng, Shandong, PRC
| | - D. Di
- Mental Health Institute of Jining Medical College, Shandong, PRC
| | - Yajuan Li
- Xian Mental Health Center, Xian, Shanxi, PRC
| | - S. Shi
- Fudan University Affiliated Huashan Hospital, Shanghai, PRC
| | - Yihan Li
- Wellcome Trust Centre for Human Genetics, Oxford, UK
| | - Y. Chen
- Clinical Trial Service Unit, Richard Doll Building, Oxford, UK
| | - J. Flint
- Wellcome Trust Centre for Human Genetics, Oxford, UK
| | - K. Kendler
- Virginia Commonwealth University (VCU), Department of Psychiatry, Virginia Institute for Psychiatric and Behavioral Genetics, Richmond, VA, USA
| | - Y. Liu
- The First Hospital of China Medical University, Shenyang, People's Republic of China (PRC)
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Sun N, Funke SA, Willbold D. A survey of peptides with effective therapeutic potential in Alzheimer's disease rodent models or in human clinical studies. Mini Rev Med Chem 2012; 12:388-98. [PMID: 22303971 PMCID: PMC3426789 DOI: 10.2174/138955712800493942] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 06/21/2011] [Accepted: 07/07/2011] [Indexed: 11/29/2022]
Abstract
Alzheimer’s disease (AD) is a devastating neurodegenerative disorder and the most common cause of dementia. Today, only palliative therapies are available. The pathological hallmarks of AD are the presence of neurofibrillary tangles and amyloid plaques, mainly composed of the amyloid-β peptide (Aβ), in the brains of the patients. Several lines of evidence suggest that the increased production and/or decreased cleavage of Aβ and subsequent accumulation of Aβ oligomers and aggregates play a fundamental role in the disease progress. Therefore, substances which bind to Aβ and influence aggregation thereof are of great interest. A wide range of Aβ binding peptides were investigated to date for therapeutic purposes. Only very few were shown to be effective in rodent AD models or in clinical studies. Here, we review those peptides and discuss their possible mechanisms of action.
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Affiliation(s)
- N Sun
- ICS-6, Forschungszentrum Jülich, 52425 Jülich, Germany
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113
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Jin L, Yu S, Shi W, Yi X, Sun N, Ge Y, Ma C. Synthesis of a novel composite nanofiltration membrane incorporated SiO2 nanoparticles for oily wastewater desalination. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.09.014] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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114
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Sun N, Zang W, Li W. Bioinformatics analysis reveals potential candidate drugs for psychological stress in ovarian cancer. Eur Rev Med Pharmacol Sci 2012; 16:1362-1366. [PMID: 23104652] [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: 06/01/2023]
Abstract
BACKGROUND Women with ovarian cancer may be at increased risk for psychological distress around the time of diagnosis relative to patients diagnosed with other cancers, because of the seriousness of the disease. However, the molecular mechanism of this effect is far from clear. AIM We sought to investigate the influence of psychological status in regulating gene expression among women with primary ovarian cancer and to identify the small molecules which exhibit similar effects with different psychological status. MATERIALS AND METHODS DNA microarray analyses of 10 ovarian carcinomas (GSE9116, downloaded from GEO) identified 916 human transcripts that were differentially expressed in tumors from patients with high depression relative to grade-and stage-matched tumors from low depression patients, and pathways related to immune system were dysfunctional. RESULTS Our results suggest that psychosocial stress is related to impaired immunity in ovarian cancer patients. Besides, we identified a group of small molecules which can be exploited as adjuvant drug to improve therapeutic effect for ovarian cancer, such as MS-275 and adiphenine. CONCLUSIONS Our findings may be useful for the development of management strategies for psychological distress, and we suggest that there is a need for improvement in the quality of life of cancer outpatients being treated with chemotherapy.
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Affiliation(s)
- N Sun
- Department of Obsterics and Gynecology, Changzheng Hospital, Second Military Medical University, Shanghai, China
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Abstract
AIMS There are growing data and a continuing controversy over the efficacy of folic acid supplementation in stroke prevention. We conducted a meta-analysis based on relevant, up-to-date published randomised trials to further examine this issue. METHODS Relative risk (RR) was used to measure the effect of folic acid supplementation on risk of stroke with a fixed-effects model. RESULTS Overall, folic acid supplementation reduced the risk of stroke by 8% (n = 55,764; RR: 0.92; 95% CI: 0.86-1.00, p = 0.038). In the 10 trials with no or partial folic acid fortification (n = 43,426), the risk of stroke was reduced by 11% (0.89; 0.82-0.97, p = 0.010). Within these trials, a greater beneficial effect was observed among trials with a lower percent use of statins [≤ 80% (median); 0.77; 0.64-0.92, p = 0.005], and a meta-regression analysis also suggested a positive dose-response relationship between percent use of statins and log-RR for stroke associated with folic acid supplementation (p = 0.013). A daily dose of 0.4-0.8mg folic acid appeared to be adequate for stroke prevention in comparison with larger doses. In the remaining five trials conducted in populations with folic acid fortification (n = 12,338), folic acid supplementation had no effect on stroke risk (1.03; 0.88-1.21, 0.69). CONCLUSIONS Our analysis indicated that folic acid supplementation is effective in stroke prevention in populations with no or partial folic acid fortification. In addition, a greater beneficial effect was observed among trials with a lower percent use of statins. Our findings underscore the importance of identifying target populations that can particularly benefit from folic acid therapy.
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Affiliation(s)
- Y Huo
- Department of Cardiology, Peking University First Hospital, Beijing, China.
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116
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Liu XH, Han M, Zhu JX, Sun N, Tang JS, Huo FQ, Li J, Xu FY, Du JQ. Metabotropic glutamate subtype 7 and 8 receptors oppositely modulate cardiac nociception in the rat nucleus tractus solitarius. Neuroscience 2012; 220:322-9. [PMID: 22617702 DOI: 10.1016/j.neuroscience.2012.05.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 04/27/2012] [Accepted: 05/09/2012] [Indexed: 01/08/2023]
Abstract
Recent study from our laboratory has indicated that microinjection of glutamate into the nucleus tractus solitarius (NTS) facilitates the cardiac-somatic reflex induced by pericardial capsaicin. Further, N-methyl-d-aspartate (NMDA) receptors and metabotropic glutamate receptors (mGluRs) mediate this function. However, the roles of the individual receptor subtypes or subunits in modulating cardiac nociception are unknown. Among the three groups of mGluRs, group III mGluRs are the primary mGluR subtype expressed in visceral afferent neurons in the NTS. The present study examined the roles of group III mGluRs and their subtype 7 and 8 receptors (mGluR7 and mGluR8) in modulating the cardiac-somatic reflex induced by pericardial capsaicin, which was monitored by recording electromyogram (EMG) activity from the spinotrapezius muscle in anesthetized rats. Intra-NTS microinjection of a group III mGluR agonist, l-(+)-2-Amino-4-phosphonobutyric acid (l-AP4, at 1, 10, and 20 nmol) or a selective mGluR7 agonist, N,N'-diphenylmethyl-1,2-ethanediamine dihydrochloride (AMN082, at 1, 2, and 4 nmol) both decreased the EMG response in a dose-dependent manner. This decrease was inhibited by the group III mGluR antagonist (RS)-α-Methylserine-O-phosphate (MSOP, at 20 nmol). In contrast, intra-NTS microinjection of a selective mGluR8 agonist, (S)-3, 4-dicarboxyphenylglycine (DCPG, at 6 and 8 nmol), significantly increased the EMG response above control levels. This effect was eliminated by intra-NTS MSOP and by vagal deafferentation. These data suggest that group III mGluRs and mGluR7 in the NTS display an inhibitory effect, while mGluR8 displays a facilitatory effect in modulating cardiac nociception, and this facilitatory effect is dependent on vagal afferents.
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Affiliation(s)
- X H Liu
- Department of Physiology and Pathophysiology, Xi'an Jiaotong University College of Medicine, Yanta Road W. 76#, Xi'an, Shaanxi 710061, China
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Zhou C, Sun N, Wang J, Che H. Research Of The Allergenicity Evaluation System Of Recombinant Human Lactoferrin (rhLF) With BN Rats. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Hyun J, Levi B, Montoro D, Hu S, Sun N, Wan D, Lee M, Nag D, Nelson E, Connolly A, Wu J, Gurtner G, Longaker M. In Vivo Directed Differentiation of Pluripotent Stem Cells to Bone Lineage and Repair of a Skeletal Defect. J Surg Res 2012. [DOI: 10.1016/j.jss.2011.11.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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119
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Sun N, Zhou C, Pu Q, Wang J, Che H. The Difference of Allergic Reactions Compared between BN Rats and Wistar Rats on Oral Exposure to Ovalbumin. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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120
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Liu XH, Sun N, Du JQ, Tang JS, Han M, Zhu JX, Huo FQ. Chemical lesioning and glutamate administration reveal a major role for the nucleus tractus solitarius in the cardiac-somatic reflex in rats. Neuroscience 2012; 207:326-32. [PMID: 22326452 DOI: 10.1016/j.neuroscience.2012.01.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 01/21/2012] [Accepted: 01/23/2012] [Indexed: 12/14/2022]
Abstract
Many patients suffer from secondary muscle hyperalgesia after experiencing angina pectoris. In this study, we examined the role of the nucleus tractus solitarius (NTS) and glutamate receptors in modulating cardiac-evoked muscle hyperalgesia induced by pericardial capsaicin, which was monitored by recording electromyogram (EMG) activity from the spinotrapezius muscle in the anesthetized rat. Unilateral chemical lesioning of the commissural NTS with the neurotoxin ibotenic acid significantly depressed the cardiac-somatic reflex; the EMG responses decreased to 56.4 ± 6.9% of that of the controls (5 of 5). Microinjection of the excitatory amino acid glutamate, at 10, 20, and 50 nmol, into the commissural NTS increased the EMG response, in a dose-dependent manner, to 116.9 ± 4.9%, 143.9 ± 10.2%, and 214.2 ± 15.8% (n=8), respectively, of that of the controls. In contrast, microinjection of the N-methyl-D-aspartate (NMDA) receptor antagonist (+)-5-methyl-10, 11-dihydro-5H-dibenzo [a, d]-cyclohepten-5,10-imine maleate (MK-801) at 4 and 6 nmol, decreased the EMG response to 45.2 ± 10.6% and 36.8 ± 14.3%, respectively, of that of the controls (n=8 for each dose). Similarly, the metabotropic glutamate receptor (mGluR) antagonist (RS)-a-methyl-4-carboxyphenylglycine (MCPG), at 2.5 and 5 nmol, decreased the EMG response to 65.2 ± 16.3% and 57.0 ± 4.2%, respectively, of that of the controls. When a combination of MK-801 and MCPG was administrated, the EMG response further decreased to 22.5 ± 13.2% (n=6) of that of the controls. However, administration of a non-NMDA receptor antagonist 6, 7-dinitroquinoxaline-2, 3-dione (DNQX), at 2 and 5 nmol, had no effect on the EMG response. These results suggest that the NTS is involved in the facilitation of the cardiac-somatic reflex, and that the NMDA receptor and mGluRs play an important role in mediating this effect.
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Affiliation(s)
- X-H Liu
- Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Medicine, 76# Yanta Road W, Xi'an, Shaanxi 710061, PR China
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Yi XS, Shi WX, Ma C, Sun N, Wang S, Jin LM, Sun LP. Optimization of complex conditions by response surface methodology for APAM-oil/water emulsion removal from aqua solutions using nano-sized TiO2/Al2O3 PVDF ultrafiltration membrane. J Hazard Mater 2011; 193:37-44. [PMID: 21872396 DOI: 10.1016/j.jhazmat.2011.06.063] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 06/18/2011] [Accepted: 06/23/2011] [Indexed: 05/31/2023]
Abstract
This paper studies the cumulative effect of various parameters, namely anionic polyacrylamide (APAM) concentration, oil concentration, pH, trans-membrane pressure (TMP), and total dissolved solid (TDS), and obtains optimal parameters for the minimum relative flux (J/J(0)) declining in aqueous solutions with response surface methodology (RSM). In order to analyze the mutual interaction and optimal values of parameters affecting ultrafiltration, a central composite rotatable design (CCRD), one method of RSM, was employed. The analysis of variance (ANOVA) of the cubic polynomial model demonstrated that this model was highly significant and reliable. The results show that the effect of APAM and oil on J/J(0) has an inverse trend with pH value increasing. Moreover, the mutual interaction of initial APAM (oil) concentration (C(APAM(oil))) and pH (TMP) were negligible, while the mutual interaction of C(APAM) and C(oil) has an obvious effect, i.e. the effect of initial feed C(APAM) became more important at higher values of initial feed C(oil), and the J/J(0) was only about 4%. The favorable operate conditions in this ultrafiltration process were at low C(APAM), C(oil), pH, and TMP, which agreed with the conclusions of many authors, while considering water production, C(APAM) and C(oil) < 50 mg/L, pH < 4, and TMP < 0.075 MPa could be accepted.
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Affiliation(s)
- X S Yi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
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122
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Sun N, Liu XH, Du JQ, Zhu JX, Tang JS, Li Q. Rostroventral medulla-mediated biphasic modulation of the rat cardiosomatic motor reflex. Neuroscience 2011; 185:174-82. [DOI: 10.1016/j.neuroscience.2011.04.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Revised: 04/02/2011] [Accepted: 04/04/2011] [Indexed: 11/30/2022]
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123
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Yi XS, Shi WX, Yu SL, Wang Y, Sun N, Jin LM, Wang S. Isotherm and kinetic behavior of adsorption of anion polyacrylamide (APAM) from aqueous solution using two kinds of PVDF UF membranes. J Hazard Mater 2011; 189:495-501. [PMID: 21398032 DOI: 10.1016/j.jhazmat.2011.02.063] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 12/21/2010] [Accepted: 02/19/2011] [Indexed: 05/30/2023]
Abstract
To determine the isotherm parameters and kinetic parameters of adsorption of anion polyacrylamide (APAM) from aqueous solution on PVDF ultrafiltration membrane (PM) and modified PVDF ultrafiltration membrane (MPM) is important in understanding the adsorption mechanism of ultrafiltration processes. Effect of variables including adsorption time, initial solution concentration, and temperature were investigated. The Redlich-Peterson equation of the five different isotherm models we chose was the most fitted model, and the R(2) was 0.9487, 0.9765 for PM and MPM, respectively; while, the pseudo-first-order model was the best choice among all the four kinetic models to describe the adsorption behavior of APAM onto membranes, suggesting that the adsorption mechanism was a chemical and physical combined adsorption on heterogeneous surface. The thermodynamic parameters were also calculated from the temperature dependence (Δ(r)G(m)(θ), Δ(r)H(m)(θ), Δ(r)S(m)(θ)), which showed that the process of adsorption is not spontaneous but endothermic process and high temperature favors the adsorption.
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Affiliation(s)
- X S Yi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
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Sun N, Leung JH, Wood NB, Hughes AD, Thom SA, Cheshire NJ, Xu XY. Computational analysis of oxygen transport in a patient-specific model of abdominal aortic aneurysm with intraluminal thrombus. Br J Radiol 2009; 82 Spec No 1:S18-23. [DOI: 10.1259/bjr/89466318] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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125
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Zou X, Bolon B, Pretorius JK, Kurahara C, McCabe J, Christiansen KA, Sun N, Duryea D, Foreman O, Senaldi G, Itano AA, Siu G. Neonatal death in mice lacking cardiotrophin-like cytokine is associated with multifocal neuronal hypoplasia. Vet Pathol 2008; 46:514-9. [PMID: 19098279 DOI: 10.1354/vp.08-vp-0239-b-bc] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Mice with null mutations of ciliary neurotrophic factor (Cntf) receptor alpha (Cntf-Ralpha), or cytokine-like factor 1 (Clf), one component of Cntf-II (a heterodimeric Cntf-Ralpha ligand), die as neonates from motor neuron loss affecting the facial nucleus and ventral horn of the lumbar spinal cord. Exposure to cardiotrophin-like cytokine (Clc), the other putative Cntf-II element, supports motor neuron survival in vitro and in ovo. Confirmation that Clc ablation induces an equivalent phenotype to Clf deletion would support a role for Clc in the functional Cntf-II complex. In this study, Clc knockout mice had decreased facial motility, did not suckle, died within 24 hours, and had 32% and 29% fewer motor neurons in the facial nucleus and lumbar ventral horn, respectively; thus, Clc is essential for motor neuron survival during development. The concordance of the Clc knockout phenotype with those of mice lacking Cntf-Ralpha or Clf bolsters the hypothesis that Clc participates in Cntf-II.
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Affiliation(s)
- X Zou
- Department of Inflammation Research, Amgen Inc., One Amgen Center Drive, MS 28-5-B, Thousand Oaks, CA 91320, USA.
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126
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Sun N, Mao L, Guo W, Wu X, Zhou X, Sun T. Synthesis large-scale high-purity InP crystal by P-injection method. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308081002] [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: 11/10/2022] Open
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127
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Nakagawa T, Nakatsuka A, Yano K, Yasugahira S, Nakamura R, Sun N, Itai A, Suzuki T, Itamura H. Expressed sequence tags from persimmon at different developmental stages. Plant Cell Rep 2008; 27:931-938. [PMID: 18301901 DOI: 10.1007/s00299-008-0518-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2007] [Revised: 01/28/2008] [Accepted: 02/10/2008] [Indexed: 05/26/2023]
Abstract
Persimmon (Diospyros kaki Thunb.) is an important fruit in Asian countries, where it is eaten as a fresh fruit and is also used for many other purposes. To understand the molecular mechanism of fruit development and ripening in persimmon, we generated a total of 9,952 expressed sequence tags (ESTs) from randomly selected clones of two different cDNA libraries. One cDNA library was derived from fruit of "Saijo" persimmon at an early stage of development, and the other from ripening fruit. These ESTs were clustered into 6,700 non-redundant sequences. Of the 6,700 non-redundant sequences evaluated, the deduced amino acid sequences of 4,356 (65%) showed significant homology to known proteins, and 2,344 (35%) showed no significant similarity to any known proteins in Arabidopsis databases. We report comparison of genes identified in the two cDNA libraries and describe some putative genes involved in proanthocyanidin and carotenoid synthesis. This study provides the first global overview of a set of genes that are expressed during fruit development and ripening in persimmon.
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Affiliation(s)
- T Nakagawa
- Department of Molecular and Functional Genomics, Center for Integrated Research in Science, Shimane University, Matsue 690-8504, Japan
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128
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Zhu J, Sun N, Aoudjit L, Li H, Kawachi H, Lemay S, Takano T. Nephrin mediates actin reorganization via phosphoinositide 3-kinase in podocytes. Kidney Int 2007; 73:556-66. [PMID: 18033240 DOI: 10.1038/sj.ki.5002691] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Nephrin is a slit diaphragm protein critical for structural and functional integrity of visceral glomerular epithelial cells (podocytes) and is known to be tyrosine phosphorylated by Src family kinases. We studied the role of phosphoinositide 3-kinase (PI3K), activated via the phosphorylation of nephrin, in actin cytoskeletal reorganization of cultured rat podocytes. Phosphorylation of rat nephrin by the Fyn kinase markedly increased its interaction with a regulatory subunit of PI3K. Stable transfection of rat nephrin in the podocytes with podocin led to nephrin tyrosine phosphorylation, PI3K-dependent phosphorylation of Akt, increased Rac1 activity, and an altered actin cytoskeleton with decreased stress fibers and increased lamellipodia. These changes were reversed with an inhibitor of PI3K and not seen when the nephrin-mutant Y1152F replaced wild-type nephrin. Rac1 and Akt1 contributed to lamellipodia formation and decreased stress fibers, respectively. Finally, in the rat model of puromycin aminonucleoside nephrosis, nephrin tyrosine phosphorylation, nephrin-PI3K association, and glomerular Akt phosphorylation were all decreased. Our results suggest that PI3K is involved in nephrin-mediated actin reorganization in podocytes. Disturbed nephrin-PI3K interactions may contribute to abnormal podocyte morphology and proteinuria.
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Affiliation(s)
- J Zhu
- Department of Medicine, McGill University, Montreal, Quebec, Canada
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129
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Sun N, Leung JH, Wood NB, Wright AR, Cheshire N, Hughes AD, Thom SAM, Xu XY. NUMERICAL MODELLING OF OXYGEN TRANSPORT IN A HUMAN ABDOMINAL AORTIC ANEURYSM WITH INTRALUMINAL THROMBUS. J Biomech 2007. [DOI: 10.1016/s0021-9290(07)70259-2] [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: 12/01/2022]
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130
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Sun N, Li Y, Tian S, Lei Y, Zheng J, Yang J, Sui N, Xu L, Pei G, Wilson FAW, Ma Y, Lei H, Hu X. Dynamic changes in orbitofrontal neuronal activity in rats during opiate administration and withdrawal. Neuroscience 2006; 138:77-82. [PMID: 16377092 DOI: 10.1016/j.neuroscience.2005.10.034] [Citation(s) in RCA: 23] [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] [Received: 06/23/2005] [Revised: 10/18/2005] [Accepted: 10/20/2005] [Indexed: 11/18/2022]
Abstract
The orbitofrontal cortex is involved in the reinforcing effects of drugs of abuse. However, how the dynamic activity in OFC changes during opiate administration and withdrawal period has not been investigated. We first tested the effects of opiates and drug craving with the conditioned place preference paradigm, using manganese-enhanced magnetic resonance imaging and traditional electroencephalograph recording techniques in rats. T1-weighted 2D MRI (4.7 T) was used after unilateral injection of MnCl(2) (200 nL, 80 mM) into the right orbitofrontal cortex. The manganese-enhanced magnetic resonance imaging data suggested that the OFC activity decreased during the opiate administration period but recovered increasingly during the withdrawal period. Also, we found decreases and increases in gamma-band (20-100 Hz) activity during the opiate administration and withdrawal period, respectively. Our results showed that orbitofrontal cortex activity decreased during morphine administration and then went up progressively over several days during withdrawal. The time course of the recovery of orbitofrontal activity from inhibition during the withdrawal period may be related to the experience of drug craving.
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Affiliation(s)
- N Sun
- Laboratory of Primate Cognitive Neuroscience, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, PR China
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131
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Sun N, Wood N, Hughes A, Thom S, Xu X. Effects of shear-dependent transport properties on mass transfer in stenosed arteries. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84508-2] [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: 11/30/2022]
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132
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Giunta B, Ehrhart J, Townsend K, Sun N, Vendrame M, Shytle D, Tan J, Fernandez F. Galantamine and nicotine have a synergistic effect on inhibition of microglial activation induced by HIV-1 gp120. Brain Res Bull 2004; 64:165-70. [PMID: 15342104 DOI: 10.1016/j.brainresbull.2004.06.008] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [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] [Received: 04/12/2004] [Revised: 06/03/2004] [Accepted: 06/09/2004] [Indexed: 11/29/2022]
Abstract
Chronic brain inflammation is the common final pathway in the majority of neurodegenerative diseases and central to this phenomenon is the immunological activation of brain mononuclear phagocyte cells, called microglia. This inflammatory mechanism is a central component of HIV-associated dementia (HAD). In the healthy state, there are endogenous signals from neurons and astrocytes, which limit excessive central nervous system (CNS) inflammation. However, the signals controlling this process have not been fully elucidated. Studies on the peripheral nervous system suggest that a cholinergic anti-inflammatory pathway regulates systemic inflammatory response by way of acetylcholine acting at the alpha7 nicotinic acetylcholine receptor (alpha7nAChR) found on blood-borne macrophages. Recent data from our laboratory indicates that cultured microglial cells also express this same receptor and that microglial anti-inflammatory properties are mediated through it and the p44/42 mitogen-activated protein kinase (MAPK) system. Here we report for the first time the creation of an in vitro model of HAD composed of cultured microglial cells synergistically activated by the addition of IFN-gamma and the HIV-1 coat glycoprotein, gp120. Furthermore, this activation, as measured by TNF-alpha and nitric oxide (NO) release, is synergistically attenuated through the alpha7 nAChR and p44/42 MAPK system by pretreatment with nicotine, and the cholinesterase inhibitor, galantamine. Our findings suggest a novel therapeutic combination to treat or prevent the onset of HAD through this modulation of the microglia inflammatory mechanism.
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Affiliation(s)
- B Giunta
- Neuroimmunology Laboratory, College of Medicine, University of South Florida, 3515 E. Fletcher Avenue, Tampa, FL 33613, USA
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133
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Kim J, Lee S, Sun N, Choung D, Kim W, Lee S, Song K. Isolation of an Angiotensin Converting Enzyme Inhibitory Substance from Chrysanthemum boreale Makino. J Food Sci 2003. [DOI: 10.1111/j.1365-2621.2003.tb08248.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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134
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Abstract
PURPOSE The aim of this study was to evaluate the results of laparoscopic treatment of varicocele and findings of testicular volume and blood supply using color Doppler ultrasound scan on follow-up. METHODS Fourteen patients aged 7 to 15 years old (median, 12.3 years) with left varicocele (grade II, n = 4; grade III, n = 10) underwent laparoscopic clipping of internal testicular vein and artery. At follow-up, both testes were scanned by ultrasonography in axial and longitudinal planes, and at least 3 measurements-length, width, and thickness-were taken to calculate testicular volumes. Arterial perfusion of the testes also was assessed. RESULTS Operating time ranged from 25 to 80 minutes (mean, 60 minutes). There was no perioperative complication. At a mean follow-up of 14 months (range, 2 to 39 months) all children were asymptomatic with disappearance of varicocele. The volumes of bilateral testes were equal (difference in volumes less than 10%) in 9 children. Ipsilateral testicular hypertrophy was found in 3 children. There was no difference in arterial perfusion between the testes in each patient. Small transient ipsilateral hydrocele was observed in 2 patients. CONCLUSION Laparoscopic clipping of testicular vein and artery was simple and effective for varicocele treatment and did not compromise testicular blood supply.
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Affiliation(s)
- N Sun
- Division of Pediatric Surgery, Department of Surgery, University of Hong Kong Medical Center, Queen Mary Hospital, Hong Kong, SAR, China
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135
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Sun N. Increased plasma concentrations of adrenomedullin and endothelin-1 in patients with essential hypertension and renal dysfunction. Am J Hypertens 2001. [DOI: 10.1016/s0895-7061(01)01808-8] [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: 11/30/2022] Open
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136
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Wu H, Zhang Y, Huang J, Zhang Y, Liu G, Sun N, Yu Z, Zhou Y. Clinical trial of arotinolol in the treatment of hypertension: dippers vs. non-dippers. Hypertens Res 2001; 24:605-10. [PMID: 11675958 DOI: 10.1291/hypres.24.605] [Citation(s) in RCA: 6] [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: 11/15/2022]
Abstract
To compare the effects of an alpha, beta blocker, arotinolol, in the treatment of essential hypertension between patients with a dipper and those with a non-dipper profile by means of 24-h ambulatory blood pressure monitoring (ABPM), a multicenter single blind parallel trial was carried out in five clinical centers. After a one-week single blind placebo run-in period, the patients underwent ABPM if their clinic diastolic blood pressure (DBP) ranged from 90-109 mmHg and their clinic systolic blood pressure (SBP) was <180 mmHg. They were divided into two groups according to the absence (non-dipper group, 24 cases) or presence (dipper group, 23 cases) of nocturnal BP reduction > or =10% of daytime BP. ABPM was measured again at the end of the active treatment phase. All patients were given Arotinolol 10-20 mg twice daily for 4 weeks. Twenty four-hour systolic and diastolic average BPs (MSBP, MDBP), 24-h systolic and diastolic blood pressure load (LS BP, LDBP), daytime systolic and diastolic average BPs (dMSBP, dMDBP), daytime systolic and diastolic blood pressure load (dLSBP, dLDBP), nighttime systolic and diastolic average BPs (nMSBP, nMDBP) and nighttime systolic and diastolic blood pressure load (nLSBP, nLDBP) were calculated. Arotinolol was effective in 78.2% of dippers and 54.2% of non-dippers, but the difference in effectiveness between these groups was not statistically significant. After treatment, SBP and DBP-including 24-h, daytime and nighttime systolic and diastolic BPs- were significantly reduced in both groups. During the daytime period, the systolic and diastolic blood pressures were significantly reduced in both dippers and non-dippers, while nighttime systolic and diastolic blood pressures were significantly reduced only in the non-dipper group. No significant changes were found in the dipper group over this period. In conclusion, Arotinolol, which can be dosed twice daily, is an effective antihypertensive agent which effectively lowers blood pressure during the day while reducing nighttime blood pressure more in non-dippers than in dippers, without excessive lowering blood pressure in the latter.
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Affiliation(s)
- H Wu
- Division of Hypertension, Cardiovascular Institute and Fu Wai Hospital, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), Beijing
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137
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Abstract
STAT5A is a molecular regulator of proliferation, differentiation, and apoptosis in lymphohematopoietic cells. Here we show that STAT5A can serve as a functional substrate of Bruton's tyrosine kinase (BTK). Purified recombinant BTK was capable of directly binding purified recombinant STAT5A with high affinity (K(d) = 44 nm), as determined by surface plasmon resonance using a BIAcore biosensor system. BTK was also capable of tyrosine-phosphorylating ectopically expressed recombinant STAT5A on Tyr(694) both in vitro and in vivo in a Janus kinase 3-independent fashion. BTK phosphorylated the Y665F, Y668F, and Y682F,Y683F mutants but not the Y694F mutant of STAT5A. STAT5A mutations in the Src homology 2 (SH2) and SH3 domains did not alter the BTK-mediated tyrosine phosphorylation. Recombinant BTK proteins with mutant pleckstrin homology, SH2, or SH3 domains were capable of phosphorylating STAT5A, whereas recombinant BTK proteins with SH1/kinase domain mutations were not. In pull-down experiments, only full-length BTK and its SH1/kinase domain (but not the pleckstrin homology, SH2, or SH3 domains) were capable of binding STAT5A. Ectopically expressed BTK kinase domain was capable of tyrosine-phosphorylating STAT5A both in vitro and in vivo. BTK-mediated tyrosine phosphorylation of ectopically expressed wild type (but not Tyr(694) mutant) STAT5A enhanced its DNA binding activity. In BTK-competent chicken B cells, anti-IgM-stimulated tyrosine phosphorylation of STAT5 protein was prevented by pretreatment with the BTK inhibitor LFM-A13 but not by pretreatment with the JAK3 inhibitor HI-P131. B cell antigen receptor ligation resulted in enhanced tyrosine phosphorylation of STAT5 in BTK-deficient chicken B cells reconstituted with wild type human BTK but not in BTK-deficient chicken B cells reconstituted with kinase-inactive mutant BTK. Similarly, anti-IgM stimulation resulted in enhanced tyrosine phosphorylation of STAT5A in BTK-competent B cells from wild type mice but not in BTK-deficient B cells from XID mice. In contrast to B cells from XID mice, B cells from JAK3 knockout mice showed a normal STAT5A phosphorylation response to anti-IgM stimulation. These findings provide unprecedented experimental evidence that BTK plays a nonredundant and pivotal role in B cell antigen receptor-mediated STAT5A activation in B cells.
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Affiliation(s)
- S Mahajan
- Molecular Signal Transduction Laboratory, Parker Hughes Cancer Center and the Department of Biochemistry, Parker Hughes Institute, St. Paul, Minnesota 55113, USA
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138
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Sun N, Elimelech M, Sun NZ, Ryan JN. A novel two-dimensional model for colloid transport in physically and geochemically heterogeneous porous media. J Contam Hydrol 2001; 49:173-199. [PMID: 11411396 DOI: 10.1016/s0169-7722(00)00193-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A two-dimensional model for colloid transport in geochemically and physically heterogeneous porous media is presented. The model considers patchwise geochemical heterogeneity, which is suitable to describe the chemical variability of many surficial aquifers with ferric oxyhydroxide-coated porous matrix, as well as spatial variability of hydraulic conductivity, which results in heterogeneous flow field. The model is comprised of a transient fluid flow equation, a transient colloid transport equation, and an equation for the dynamics of colloid deposition and release. Numerical simulations were carried out with the model to investigate the colloid transport behavior in layered and randomly heterogeneous porous media. Results demonstrate that physical and geochemical heterogeneities markedly affect the colloid transport behavior. Layered physical or geochemical heterogeneity can result in distinct preferential flow paths of colloidal particles. Furthermore, the combined effect of layered physical and geochemical heterogeneity may result in enhanced or reduced preferential flow of colloids. Random distribution of physical heterogeneity (hydraulic conductivity) results in a random flow field and an irregularly distributed colloid concentration profile in the porous medium. Contrary to random physical heterogeneity, the effect of random patchwise geochemical heterogeneity on colloid transport behavior is not significant. It is mostly the mean value of geochemical heterogeneity rather than its distribution that governs the colloid transport behavior.
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Affiliation(s)
- N Sun
- Environmental Engineering Program, Department of Chemical Engineering, Yale University, P.O. Box 208286, New Haven, CT 06520-8286, USA
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139
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Wang H, Hu D, Sun N, Gong L, Zhang W. Effect of long-acting isosorbide-5-mononitrate administration on large artery distensibility in patients with essential hypertension. Hypertens Res 2001; 24:311-4. [PMID: 11409656 DOI: 10.1291/hypres.24.311] [Citation(s) in RCA: 7] [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: 11/15/2022]
Abstract
To evaluate the clinical efficacy of long-acting nitrates, isosorbide-5-mononitrate (IS-5-MN), on large artery distensibility in patients with essential hypertension. Large arterial distensibility was assessed by automatic noninvasive measurement of the carotid-femoral pulse wave velocity (PWV). Seventeen patients aged 62.53+/-7.94 years (mean+/-SD) with essential hypertension undering long-term antihypertensive therapy were studied in this trial. PWV was measured 2 weeks and 4 weeks after oral administration of IS-5-MN (30 mg once daily) with previous therapy. There was no significant difference in systolic blood pressure, diastolic blood pressure, pulse pressure or heart rate at 2 weeks and 4 weeks after treatment compared with baseline. The carotid-femoral PWV decreased significantly at 2 and 4 weeks after treatment (p<0.05, p< 0.05, respectively). Long-acting nitrates have potential value in improving large arterial distensibility in patients with essential hypertension independent of blood pressure alteration. It might be used as an effectively additive drug in hypertension control.
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Affiliation(s)
- H Wang
- Department of Cardiology, People's Hospital, Peking University, Beijing, PR China.
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140
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Connolly Y, Littler E, Sun N, Chen X, Huang PC, Stacey SN, Arrand JR. Antibodies to Epstein-Barr virus thymidine kinase: a characteristic marker for the serological detection of nasopharyngeal carcinoma. Int J Cancer 2001; 91:692-7. [PMID: 11267982 DOI: 10.1002/1097-0215(200002)9999:9999<::aid-ijc1108>3.0.co;2-g] [Citation(s) in RCA: 23] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Patients suffering from nasopharyngeal carcinoma (NPC) generally exhibit elevated serum IgA antibody titres to Epstein-Barr virus (EBV) early antigen (EA) and virus capsid antigen (VCA). This property is frequently used as a diagnostic aid. Preliminary experiments suggested that an ELISA for IgA antibodies against the EBV-encoded thymidine kinase (TK) could form the basis of a more reliable diagnostic test. Here, we describe the construction of a recombinant baculovirus that expresses the EBV TK and present a full analysis of its use in serological surveys of NPC patients. Baculovirus-derived TK was used to develop a simple ELISA for serum IgA against this antigen. ELISA reactivity was strongly associated with NPC compared with an EBV-positive, normal control population. Comparison with the existing IgA-VCA and EA assays showed that the TK ELISA had higher sensitivity whilst the specificity was similar or higher. We conclude that the TK ELISA presents a strong predictor of NPC and, in its refined form, has improved pickup rates. In addition, results from patients with chronic nasopharyngitis (CNP) suggest that individuals with both symptoms of CNP and an elevated TK ELISA value may be at increased risk for the development of head-and-neck cancer.
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Affiliation(s)
- Y Connolly
- Paterson Institute for Cancer Research, Christie CRC Research Centre, Manchester, United Kingdom
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141
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Abstract
Recent studies have examined and demonstrated the potential cancer chemopreventive activity of freeze-dried berries including strawberries and black raspberries. Although ellagic acid, an abundant component in these berries, has been shown to inhibit carcinogenesis both in vivo and in vitro, several studies have reported that other compounds in the berries may also contribute to the observed inhibitory effect. In the present study, freeze-dried strawberries (Fragara ananassa, FA) or black raspberries (Rubus ursinus, RU) were extracted, partitioned and chromatographed into several fractions (FA-F001, FA-F003, FA-F004, FA-F005, FA-DM, FA-ME from strawberries and RU-F001, RU-F003, RU-F004, RU-F005, RU-DM, RU-ME from black raspberries). These extracts, along with ellagic acid, were analyzed for anti-transformation activity in the Syrian hamster embryo (SHE) cell transformation model. None of the extracts nor ellagic acid by themselves produced an increase in morphological transformation. For assessment of chemopreventive activity, SHE cells were treated with each agent and benzo[a]pyrene (B[a]P) for 7 days. Ellagic acid, FA-ME and RU-ME fractions produced a dose-dependent decrease in transformation compared with B[a]P treatment only, while other fractions failed to induce a significant decrease. Ellagic acid, FA-ME and RU-ME were further examined using a 24 h co-treatment with B[a]P or a 6 day treatment following 24 h with B[a]P. Ellagic acid showed inhibitory ability in both protocols. FA-ME and RU-ME significantly reduced B[a]P-induced transformation only when co-treated with B[a]P for 24 h. These results suggest that a methanol extract from strawberries and black raspberries may display chemopreventive activity. The possible mechanism by which these methanol fractions (FA-ME, RU-ME) inhibited cell transformation appear to involve interference of uptake, activation, detoxification of B[a]P and/or intervention of DNA binding and DNA repair.
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Affiliation(s)
- H Xue
- Division of Toxicology, Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN, USA
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142
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Du X, Sun N, Tamura T, Mohri A, Sugiura M, Yoshizawa T, Irino N, Hayashi J, Shoyama Y. Higher yielding isolation of kinsenoside in Anoectochilus and its antihyperliposis effect. Biol Pharm Bull 2001; 24:65-9. [PMID: 11201248 DOI: 10.1248/bpb.24.65] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [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
A higher concentration of kinsenoside, 3-(R)-3-beta-D-glucopyranosyloxybutanolide (1), was detected in the crude drug Anoectochilusformosanus, and A. koshunensis by HPLC analysis. A methylation reaction occurred to give methyl ester (4) when the lactone ring of 1 was cleaved by silica gel catalysis using methanol containing solvent used in the purification step resulting in difficulty to purify 1. To avoid the cleavage reaction, a reversed-phase or silica gel column without methanol was used to give a high yield of 1. In an anti-hyperliposis assay using high-fat diet rats, 1 significantly reduced the weights of body and liver, and also decreased the triglyceride level in the liver compared to those of control rats. On the other hand, the epimer of 1, 3-(S)-3-beta-glucopyranosy-loxybutanolide (2), trivially named goodyeroside A, which was isolated from Goodyera species, had no effect for anti-hyperliposis. In aurothioglucose-induced obese mouse, 1 suppressed the body and liver weight increase, significantly ameliorated the triglyceride level in the liver, and also reduced the deposition of uterine fat-pads.
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Affiliation(s)
- X Du
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
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143
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Abstract
To assess the response of the sympathetic nervous system (SNS) to the handgrip test in essential hypertensive patients and to evaluate the effects of verapamil SR and bisoprolol on the reduction of the SNS's activity. Seventy eight essential hypertensive patients (50 receiving verapamil SR treatment and 28 receiving bisoprolol treatment) took the handgrip test while the SBP, DBP, and HR were measured on three occasions during the test (before test, 3 min after the patients squeezed the handgrip, and 2 min after the handgrip was released). Before and after the patients received Verapamil SR or Bisoprolol treatment, the plasma concentrations of epinephrine(E), norepinephrine (NE), angiotensin-II (AII), aldosterone (ALD), endothelin-1 (ET-1) and renin activity (RA) were measured post-test. 1) In about 70% of the essential hypertensive patients, SNS activity was above normal. Their HR and BP exceeded 20% when responding to stress. 2) In these patients, the baseline plasma concentrations of E, NE, AII, ET-1, ALD, and RA were higher than those whose SNS's activity was normal. 3) After 6 weeks of treatment, all the patients' BPs decreased remarkably. Verapamil SR could reduce the plasma concentrations of NE, AII, and ET-1 and increase RA. Bisoprolol could reduce E and RA. These two antihypertension drugs can both decrease BP and reduce the activity of SNS through different mechanisms.
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Affiliation(s)
- N Sun
- Cardiovascular Department, Peking University, People's Hospital, Bejing, P.R. China
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144
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Qi Q, Sun N, Hao N. [Application of the fluorescent in situ hybridization on the prenatal diagnosis of the fetal aneuploidy in the uncultured amniocytes]. Zhonghua Fu Chan Ke Za Zhi 2000; 35:517-9. [PMID: 11775938] [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 study the method and value of fluorescent in situ hybridization (FISH) on the rapid prenatal diagnosis of the fetal aneuploidy in the uncultured amniocytes. METHODS Amniocentesis was performed in 20 pregnant women of 16-36 gestational weeks with indications of prenatal diagnosis. We performed FISH, respectively, with the biotin labelled chromosome X and 18 centromeric probes and the digoxin labelled chromosome Y centromeric and 21q11 and 13q14-q21 specific probes on the uncultured amniocytes. The slides were observed under the fluorescent microscope and the images were captured by the Applied Imaging System. RESULTS Normal chromosome number was observed in 19 cases: 10 cases of 46, XX and 9 cases of 46, XY. Aneuploidy was found in 1 case which was 46, XY/47, XXY and proved by G-banding chromosomal on cord blood. CONCLUSION Fetal aneuploidy could be diagnosed within 24 hours after the amniocentesis by FISH. FISH is a rapid, accurate and reliable method to detect fetal aneuphoidy in uncultured amniocytes.
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Affiliation(s)
- Q Qi
- Department of Obstetrics and Gynecology, Chinese Academy of Medical Science, Peking Union Medical College, Peking Union Medical College Hospital, Beijing 100730, China
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145
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Pajor AM, Krajewski SJ, Sun N, Gangula R. Cysteine residues in the Na+/dicarboxylate co-transporter, NaDC-1. Biochem J 1999; 344 Pt 1:205-9. [PMID: 10548552 PMCID: PMC1220632] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
The role of cysteine residues in the Na(+)/dicarboxylate co-transporter (NaDC-1) was tested using site-directed mutagenesis. The transport activity of NaDC-1 was not affected by mutagenesis of any of the 11 cysteine residues, indicating that no individual cysteine residue is necessary for function. NaDC-1 is sensitive to inhibition by the impermeant cysteine-specific reagent, p-chloromercuribenzenesulphonate (pCMBS). The pCMBS-sensitive residues in NaDC-1 are Cys-227, found in transmembrane domain 5, and Cys-476, located in transmembrane domain 9. Although cysteine residues are not required for function in NaDC-1, their presence appears to be important for protein stability or trafficking to the plasma membrane. There was a direct relationship between the number of cysteine residues, regardless of location, and the transport activity and expression of NaDC-1. The results indicate that mutagenesis of multiple cysteine residues in NaDC-1 may alter the shape or configuration of the protein, leading to alterations in protein trafficking or stability.
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Affiliation(s)
- A M Pajor
- Department of Physiology, University of Texas Medical Branch, Galveston, TX 77555-0641, USA.
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146
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Sun N, Li Y, Wang JY, Du CY. [Separation and determination of 1,5-benzothiazepines-alpha-chloro-beta-lactam with thin-layer chromatography]. Se Pu 1999; 17:604-5. [PMID: 12552708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
A method for separation and determination of 1,5-benzothiazepines-alpha-chloro-beta-lactam in reaction mixture by thin-layer chromatography has been established. The operating conditions were: lambda 1 = 270 nm, lambda 2 = 310 nm, beam size: 1.2 mm x 1.2 mm, SX = 3. The calibration curve was linear in the range of 0.285-5.7 micrograms (r = 0.9952, n = 8) and the detectable limit was 0.114 microgram. The coefficient of variation of this method was less than 5% and the average recovery for beta-lactam was 96.75%. The method is simple and rapid.
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Affiliation(s)
- N Sun
- Department of Chemistry, Hebei Normal University, Shijiazhuang 050016, China
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147
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148
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Abstract
Increased levels of neuron-specific enolase (NSE), a key glycolytic enzyme, in either the cerebrospinal fluid or the serum is correlated with both the duration and the outcome of status epilepticus. To further understand the molecular basis of seizure-induced elevations in NSE protein, we investigated NSE mRNA expression in the adult rat brain following systemic administration of kainic acid. The findings demonstrated either no change or a decrease in NSE gene expression during, and following, status epilepticus, suggesting that posttranscriptional mechanisms are responsible for seizure-induced increases in NSE protein.
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Affiliation(s)
- S S Schreiber
- Departments of Neurology, University of Southern California School of Medicine, Los Angeles, California, 90033, USA.
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149
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Abstract
The Na(+)/dicarboxylate cotransporter of the renal proximal tubule, NaDC-1, reabsorbs Krebs cycle intermediates, such as succinate and citrate, from the tubular filtrate. Although long-term regulation of this transporter by chronic metabolic acidosis and K(+) deficiency is well documented, there is no information on acute regulation of NaDC-1. In the present study, the transport of succinate in Xenopus oocytes expressing NaDC-1 was inhibited up to 95% by two activators of protein kinase C, phorbol 12-myristate, 13-acetate (PMA) and sn-1, 2-dioctanoylglycerol (DOG). Activation of protein kinase A had no effect on NaDC-1 activity. The inhibition of NaDC-1 transport by PMA was dose-dependent, and could be prevented by incubation of the oocytes with staurosporine. Mutations of the two consensus protein kinase C phosphorylation sites in NaDC-1 did not affect inhibition by PMA. The inhibitory effects of PMA were partially prevented by cytochalasin D, which disrupts microfilaments and endocytosis. PMA treatment was also associated with a decrease of approximately 30% in the amount of NaDC-1 protein found on the plasma membrane. We conclude that the inhibition of NaDC-1 transport activity by PMA occurs by a combination of endocytosis and inhibition of transport activity.
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Affiliation(s)
- A M Pajor
- Department of Physiology and Biophysics, University of Texas Medical Branch, Galveston, TX 77555-0641, USA.
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150
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Zhang Q, Sun N, Chen X, Mo M, Li F, Cai Q. [Effects of EB virus LMP on the differentiation and growth of human nasopharyngeal carcinoma cell line CNE1]. Zhonghua Bing Li Xue Za Zhi 1999; 28:285-9. [PMID: 11869540] [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 study the effects of EBV-LMP gene on differentiation and growth of human nasopharyngeal carcinoma (NPC) cell. METHODS With NPC cell line (CNE1) as target, electroporation was used to transfect EBV-LMP gene and the vector into CNE1 cells. The proliferation changes of transfectants were measured in vitro by proliferation experiment. FCM method and transplantation in nude mice were used. RESULTS LMP promoted the growth ability of NPC CNE1 cells in vitro. The average A ratio (3.98 +/- 0.11) in the treatment group was higher than in the control group (2.36 +/- 0.05) and also in the negative control group (2.75 +/- 0.07, P < 0.01). Clone forming test (25.2%, 378/1 500) in the treatment group was higher than in the control groups (11.2%, 168/1 500) and negative control groups (13.4%, 201/1 500). When FCM method was used, the keratin positive rate (82.7%) in the treatment group was markedly decreased as compared with the control (92.5%) and negative control groups (95.7%, P < 0. 05). Latent period (26.6 +/- 7.7) days and internal double time (2.51 +/- 0.18) days of transplant tumor of the treatment group were markedly shortened, tumor take rate (5/6) was increased, cells of the transplant tumor in the treatment group showed an image of small size, great allotype, and a trend of low differentiation. CONCLUSION The EBV-LMP can promote the growth and inhibit the differentiation of NPC CNE1 cells. EBV-LMP may play an important role in the development of NPC and in studying its mechanism.
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Affiliation(s)
- Q Zhang
- Department of Pathology, Guangdong Medical College, Zhanjiang 524023
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