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Zhao C, Li FM, Zhai YF, Li S, Yu HY, Wang M. High-Wettability Poly(dimethylsiloxane) Substrate for Ultrastable Conductive Three-Dimensional Woven Ag Nanowire Grids. ACS Appl Mater Interfaces 2023; 15:4835-4844. [PMID: 36642925 DOI: 10.1021/acsami.2c21898] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Three-dimensional (3D) woven Ag nanowire (AgNW) grids have great potential for enhancing the mechanical stabilities, conductivity, and transmittance of flexible transparent electrodes (FTEs). However, it is a great challenge to control the formation of 3D woven AgNW grids on various substrates, especially the poly(dimethylsiloxane) (PDMS) substrate. This work presents a microtransfer-printing method for preparing a high-wettability poly(dimethylsiloxane) (PDMS) substrate to control the formation of 3D woven AgNW grids. The as-prepared PDMS substrate shows a high wettability performance. The surface structures of the PDMS substrate can control the sharp shrinkage of the ink membrane to give rise to a uniform liquid membrane evaporation behavior, which is the key factor for preparing a uniform 3D woven nanowire network. A thin uniform 3D woven AgNW network with a low sheet resistance of 24.3 Ω/□ and high transmittance of 92% was coated on the PDMS substrate. The networks directly coated the surface of the replicated PDMS, which simplified the peeling process and protected the networks from peeling strain and mechanical deformations. Moreover, the increment of resistance retained a small value (∼5%) when bending cycles reached 9,000. An alternating current electroluminescent (ACEL) device was prepared, and the uniform electroluminescence implies that a defect-free electrode has been fabricated. These results indicate that the as-prepared FTEs have excellent mechanical performance and great potential for flexible optoelectronic applications.
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Affiliation(s)
- Cong Zhao
- School of Microelectronics, Southern University of Science and Technology, Shenzhen518055, China
- Engineering Research Center of Integrated Circuits for Next-Generation Communications, Ministry of Education, Southern University of Science and Technology, Shenzhen518055, China
| | - Fang-Mei Li
- School of Microelectronics, Southern University of Science and Technology, Shenzhen518055, China
| | - Yu-Fei Zhai
- School of Microelectronics, Southern University of Science and Technology, Shenzhen518055, China
| | - Song Li
- School of Microelectronics, Southern University of Science and Technology, Shenzhen518055, China
| | - Hong-Yu Yu
- School of Microelectronics, Southern University of Science and Technology, Shenzhen518055, China
- Engineering Research Center of Integrated Circuits for Next-Generation Communications, Ministry of Education, Southern University of Science and Technology, Shenzhen518055, China
| | - Min Wang
- School of Microelectronics, Southern University of Science and Technology, Shenzhen518055, China
- Engineering Research Center of Integrated Circuits for Next-Generation Communications, Ministry of Education, Southern University of Science and Technology, Shenzhen518055, China
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Li FM, Xie SY, Jiang ZX, Bao SY, Ren YF, Chen YY. [Burden of disease and risk factors among children under 5 years in China from 1990 to 2019: a perspective of international comparison]. Zhonghua Yu Fang Yi Xue Za Zhi 2022; 56:619-625. [PMID: 35644977 DOI: 10.3760/cma.j.cn112150-20210517-00476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Based on the Global Burden of Disease study 2019, the standardized mortality rate and disability-adjusted life years (DALYs) rate of children under 5 years old were selected as evaluation indicators to compare and analyze the current situation and differences of disease burden of children under 5 years old between China and other regions from 1990 to 2019. The change trend and difference of disease burden of children under 5 years old in China were analyzed by sexes. From 1990 to 2019, the all-cause standardized mortality rate of children under 5 years old in China decreased from 1 153.81/100 000 to 160.39/100 000, and the all-cause standardized DALY rate decreased from 104 426.40/100 000 to 16 479.01/100 000. In 2019, neonatal preterm birth, congenital heart anomalies and lower respiratory infections ranked the top three disease burden of children under 5 years old in China. Except that the disease burden of neonatal preterm birth was lower than that in North America, they were much higher than that in Western Europe and North America in the same period. The burden of unintentional injury diseases, including pulmonary aspiration and foreign body in airway and drowning, was higher than that in Western Europe and North America. The standardized mortality and DALY rate of the top ten diseases and injuries in boys and girls under 5 years old in China showed a downward trend (P<0.05), and most of them were higher in boys than girls (P<0.05). From 1990 to 2019, the disease burden of children under 5 years old in China decreased significantly. However, compared other regions, it is still necessary to strengthen the prevention and control of neonatal premature birth, birth defects and unintentional injuries, and take different sex-specific interventions to improve the overall health of children.
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Affiliation(s)
- F M Li
- School of Public Health, Fudan University, Shanghai 200032, China NHC Key Laboratory of Health Technology Assessment (Fudan University), Shanghai 200032, China
| | - S Y Xie
- School of Public Health, Fudan University, Shanghai 200032, China NHC Key Laboratory of Health Technology Assessment (Fudan University), Shanghai 200032, China
| | - Z X Jiang
- School of Public Health, Fudan University, Shanghai 200032, China NHC Key Laboratory of Health Technology Assessment (Fudan University), Shanghai 200032, China
| | - S Y Bao
- School of Public Health, Fudan University, Shanghai 200032, China NHC Key Laboratory of Health Technology Assessment (Fudan University), Shanghai 200032, China
| | - Y F Ren
- School of Public Health, Fudan University, Shanghai 200032, China NHC Key Laboratory of Health Technology Assessment (Fudan University), Shanghai 200032, China
| | - Y Y Chen
- School of Public Health, Fudan University, Shanghai 200032, China NHC Key Laboratory of Health Technology Assessment (Fudan University), Shanghai 200032, China
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Xia MN, Gao F, Li FM, Gao MD. Diagnostic value of dual-source spiral CT in patients with diabetic lower limb arteriosclerosis obliterans. J BIOL REG HOMEOS AG 2021; 35:1. [PMID: 34327973 DOI: 10.23812/21-si1-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- M N Xia
- Department of Endocrinology, Changyi People's Hospital, Weifang, Shandong Province, China
| | - F Gao
- Department of Endocrinology, Changyi People's Hospital, Weifang, Shandong Province, China
| | - F M Li
- Department of Endocrinology, Changyi People's Hospital, Weifang, Shandong Province, China
| | - M D Gao
- Department of Endocrinology, Changyi People's Hospital, Weifang, Shandong Province, China
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Huang LJ, Shen Y, Bai J, Wang FX, Feng YD, Chen HL, Peng Y, Zhang R, Li FM, Zhang PH, Lei XR, Xue F, Ma YP, Hu JS, He AL. High Expression Levels of Long Noncoding RNA Small Nucleolar RNA Host Gene 18 and Semaphorin 5A Indicate Poor Prognosis in Multiple Myeloma. Acta Haematol 2019; 143:279-288. [PMID: 31597158 DOI: 10.1159/000502404] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 02/28/2019] [Accepted: 07/29/2019] [Indexed: 12/22/2022]
Abstract
BACKGROUND The aim of this study was to detect the expression of long noncoding RNA small nucleolar RNA host gene 18 (SNHG18) andsemaphorin 5A (SEMA5A) genes in multiple myeloma (MM) patients and to explore the correlation of the expression of these genes with the clinical characteristics and prognosis of MM patients. METHODS Forty-seven newly diagnosed MM, 18 complete remission MM, 13 refractory/relapse MM, and 22 iron deficiency anemia (serving as control) samples were extracted at the Department of Hematology, Second Affiliated Hospital of Xian Jiaotong University between January 2015 and December 2016. The clinical features of the MM patients are summarized. Real-time quantitative PCR was performed to analyze the relative expression levels of the SNHG18 and SEMA5Agenes. The clinical characteristics and overall survival (OS) of the MM patients were statistically analyzed while measuring different levels of SNHG18 and SEMA5Agene expression. At the same time, the correlation between the expression of SNHG18 and SEMA5A was also analyzed. RESULTS The analysis confirmed that SNHG18 and its possible target gene SEMA5A were both highly expressed in newly diagnosed MM patients. After analyzing the clinical significance of SNHG18 and SEMA5A in MM patients, we found that the expression of SNHG18 and SEMA5A was related to the Durie-Salmon (DS), International Staging System (ISS), and Revised International Staging System (R-ISS) classification systems, and the Mayo Clinic Risk Stratification for Multiple Myeloma (mSMART; p < 0.05). Moreover, we observed a significant difference in OS between the SNHG18/SEMA5A high expression group and the low expression group. We found a positive correlation between SNHG18 and SEMA5A expression (r = 0.709, p < 0.01). Surprisingly, the expected median OS times of both the SNHG18 and SEMA5Ahigh expression groups were significantly decreased, which was in contrast to those of both the SNHG18 and SEMA5Alow expression groups and the single-gene high expression group (p < 0.05). CONCLUSION High expression of both SNHG18 and SEMA5A is associated with poor prognosis in patients with MM.
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Affiliation(s)
- Ling-Juan Huang
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
- Department of General Medicine, The First Affiliated Hospital of Xi'an Medical University, Xi'an, China
- School of General Medicine, Xi'an Medical University, Xi'an, China
| | - Ying Shen
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Ju Bai
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Fang-Xia Wang
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yuan-Dong Feng
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Hong-Li Chen
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yue Peng
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Ru Zhang
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Fang-Mei Li
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Pei-Hua Zhang
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Xiao-Ru Lei
- Institute of Hematology, Xi'an Central Hospital, Xi'an, China
| | - Feng Xue
- Department of Hematology, The First Affiliated Hospital of Xi'an Medical University, Xi'an, China
| | - Yan-Ping Ma
- Department of Hematology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Jin-Song Hu
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, China
| | - Ai-Li He
- Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China,
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Huang JL, Li WG, Chen FZ, Su ZJ, Li FM, Liu B. [The clinical impact of artery-first approach combined with vascular resection and reconstruction in the treatment of pancreatic head carcinoma]. Zhonghua Zhong Liu Za Zhi 2017; 39:225-230. [PMID: 28316225 DOI: 10.3760/cma.j.issn.0253-3766.2017.03.014] [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
Objective: To evaluate the application of artery first, combined vascular resection and reconstruction in the treatment of pancreatic head carcinoma. Methods: The clinical data of 13 patients with pancreatic head cancer were retrospectively analyzed from February 2014 to March 2016 in the Affiliated Hospital of Xiamen University. Preoperative computed tomography of high resolution layer or magnetic resonance imaging examination demonstrated pancreatic head carcinoma, as well as close adhesion, stenosis, compression or displacement of superior mesenteric vein or portal vein wall. In the operation, the artery first approach was used and the whole arterial blood supply in the head of the pancreas was fully exposed and interdicted. Finally, en block resection and vascular resection and reconstruction was adopted. Results: 12 of 13 patients had pancreatoduodenectomy synchronously with vascular resection and reconstruction; the other patient had these two surgery sequentially. Four patients received blood vessel wedge resection, five had segmental resection combined with end to end suture, and four had segmental resection combined with artificial vascular graft reconstruction. Operation time was (327.2±65.5) minutes, and the amount of blood loss was (472.6±226.4) millilitres. One patient suffered from delayed gastric emptying, and two patients had pancreatic fistula. All patients recovered from postoperative complications by conservative treatment. No patients developed biliary fistula, gastrointestinal fistula, abdominal infection, pulmonary infection, diarrhea, hypoglycemia or other complications, and none died in perioperative period. Postoperative pathological findings confirmed the diagnosis of pancreatic ductal adenocarcinoma. Mean tumor diameter was (4.2±1.5)cm, and (3.8±1.5) metastasis were found in (13.6±2.5) resected lymph nodes. In 11 cases, the tumor cells were found in the outer membrane of blood vessels, 2 cases were found to have tumor invasion in the inner membrane, and all the resection margins were negative. All patients were followed up, and 2 patients died of liver metastasis 11 months and 18 months after operation, respectively. One patient survived with local recurrence of tumor 13 months after surgery. Other patients had no tumor recurrence and metastasis. Conclusions: The artery first approch combined vascular resection and reconstruction is safe effective and feasible in the treatment of pancreatic head carcinoma. It can improve the ablation rate of pancreatoduodenectomy.
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Affiliation(s)
- J L Huang
- Department of Hepatobiliary Surgery, Chenggong Hospital Affiliated to Xiamen University, Xiamen Key Laboratory of biliary tract diseases, Xiamen 361000, China
| | - W G Li
- Department of Hepatobiliary Surgery, Chenggong Hospital Affiliated to Xiamen University, Xiamen Key Laboratory of biliary tract diseases, Xiamen 361000, China
| | - F Z Chen
- Department of Hepatobiliary Surgery, Chenggong Hospital Affiliated to Xiamen University, Xiamen Key Laboratory of biliary tract diseases, Xiamen 361000, China
| | - Z J Su
- Department of Hepatobiliary Surgery, Chenggong Hospital Affiliated to Xiamen University, Xiamen Key Laboratory of biliary tract diseases, Xiamen 361000, China
| | - F M Li
- Department of Hepatobiliary Surgery, Chenggong Hospital Affiliated to Xiamen University, Xiamen Key Laboratory of biliary tract diseases, Xiamen 361000, China
| | - B Liu
- Department of Hepatobiliary Surgery, Chenggong Hospital Affiliated to Xiamen University, Xiamen Key Laboratory of biliary tract diseases, Xiamen 361000, China
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Zhu LZ, Chen ZP, Li FM, Liu H, Chen ZY, Zhuang G. Diamagnetic measurements based on the compensation of TF current diffusion in J-TEXT. Rev Sci Instrum 2016; 87:11D420. [PMID: 27910511 DOI: 10.1063/1.4960413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Due to the existence both of toroidal ripples and toroidal field (TF) current diffusion, the toroidal flux changes with time when the TF current is at the flat-top. A diamagnetic measurement based on the compensation of TF current diffusion has been built in J-TEXT to solve this problem. The measurement system includes a double-loop installed in the vacuum vessel and an array of small printed circuit board (PCB) magnetic probes placed on the mid-plane of one TF coil. A model was proposed to analyze and compensate the effect of TF current diffusion. Experiment results show that the residual flux is about 1 × 10-4 Wb after the compensation and it can meet the need of diamagnetic measurement in J-TEXT.
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Affiliation(s)
- L Z Zhu
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Z P Chen
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - F M Li
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - H Liu
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Z Y Chen
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - G Zhuang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Nguyen TAH, Ngo HH, Guo WS, Pham TQ, Li FM, Nguyen TV, Bui XT. Adsorption of phosphate from aqueous solutions and sewage using zirconium loaded okara (ZLO): Fixed-bed column study. Sci Total Environ 2015; 523:40-9. [PMID: 25847314 DOI: 10.1016/j.scitotenv.2015.03.126] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 03/29/2015] [Accepted: 03/29/2015] [Indexed: 05/27/2023]
Abstract
This study explores the potential of removing phosphorus from aqueous solutions and sewage by Zr(IV)-loaded okara (ZLO) in the fixed-bed column. Soybean residue (okara) was impregnated with 0.25M Zr(IV) solution to prepare active binding sites for phosphate. The effect of several factors, including flow rate, bed height, initial phosphorus concentration, pH and adsorbent particle size on the performance of ZLO was examined. The maximum dynamic adsorption capacity of ZLO for phosphorus was estimated to be 16.43mg/g. Breakthrough curve modeling indicated that Adams-Bohart model and Thomas model fitted the experimental data better than Yoon-Nelson model. After treatment with ZLO packed bed column, the effluent could meet the discharge standard for phosphorus in Australia. Successful desorption and regeneration were achieved with 0.2 NaOH and 0.1 HCl, respectively. The results prove that ZLO can be used as a promising phosphorus adsorbent in the dynamic adsorption system.
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Affiliation(s)
- T A H Nguyen
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), 15 Broadway, Ultimo, NSW 2007, Australia
| | - H H Ngo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), 15 Broadway, Ultimo, NSW 2007, Australia.
| | - W S Guo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), 15 Broadway, Ultimo, NSW 2007, Australia
| | - T Q Pham
- Faculty of Geography, University of Science, Vietnam National University, Hanoi, Viet Nam
| | - F M Li
- College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - T V Nguyen
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), 15 Broadway, Ultimo, NSW 2007, Australia
| | - X T Bui
- Environmental Engineering and Management Research Group, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology-Vietnam National University, Ho Chi Minh City, Viet Nam
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Yu DH, Lin J, Qu JH, Zhu Z, Li FM, Ni CR, Zhu MH. [Hepatitis B virus X protein inhibits hepatoma cell growth in vitro through p14(ARF)-dependent and p14(ARF)-independent pathways]. Nan Fang Yi Ke Da Xue Xue Bao 2009; 29:1089-1093. [PMID: 19726330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To explore the effects of hepatitis B virus X protein (HBx) on hepatoma cell growth through p14(ARF)-dependent and p14(ARF)-independent pathways. METHODS HBx and p14(ARF) were transfected either separately or in combination into HepG2 cells containing wt-p53 but not expressing p14(ARF). The cells were divided into 4 groups, namely pcDNA3 (control), pcDNA3HBx, pcDNA3p14(ARF), and pcDNA3HBx + pcDNA3p14(ARF) groups. Flow cytometry was used to examine the apoptosis rates and cell cycle progression of HepG2 cells in different groups. The expression of p14(ARF), MDM2, p53, and p21(WAF1) proteins were investigated by detecting the activity of p21(WAF1) promoter-luciferase and using Western blotting. RESULTS The apoptosis rates of HepG2 cells in pcDNA3HBx and pcDNA3p14(ARF) groups were significantly higher than that in the control group (14.11%, 13.72% vs 10.66%). Compared with the control group, pcDNA3HBx and pcDNA3p14(ARF) groups also showed significantly higher cell percentages arrested at G(0)/G(1) phase (63.62%, 61.75% vs 57.42%), luciferase activity of p21 promoter (1.25-/+0.05, 1.09-/+0.06 vs 0.77-/+0.03) and expressions of p53 and p21(WAF1). The cell apoptosis rate, percentage of cells in G(0)/G(1) phase and expression level of p14(ARF) were even higher in pcDNA3HBx+pcDNA3p14(ARF) group (18.61%, 66.74%, and 3.53-/+0.43, respectively) than in either p14(ARF) or HBx group. CONCLUSION HBx induces p53 expression through p14(ARF)-dependent and independent pathways to activate p21(WAF1) promoter, leading to G(0)/G(1) arrest and apoptosis of HepG2 cells.
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Affiliation(s)
- Dang-Hui Yu
- Department of Pathology, Changhai Hospital, Second Military Medical University, Shanghai, China.
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Luo J, Lei T, Xu X, Li FM, Ma Y, Wu K, Pei J. Three-Dimensional Shape-Persistent Fluorescent Nanocages: Facile Dynamic Synthesis, Photophysical Properties, and Surface Morphologies. Chemistry 2008; 14:3860-5. [DOI: 10.1002/chem.200800154] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yu GZ, Zhu MH, Chen Y, Ni CR, Li FM. [Expression and clinical significance of P53 pathway-associated proteins in pancreatic carcinoma]. Ai Zheng 2005; 24:1398-403. [PMID: 16552971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
BACKGROUND & OBJECTIVE P53 pathway plays a critical role in carcinogenesis of pancreatic carcinoma. However, its trigger and function mechanisms have seldom been reported. This study was to investigate the expression and clinical significance of P53 pathway-related proteins ATM, P53, Mdm2, and P21(WAF/CIP1) in pancreatic carcinoma. METHODS The expression of ATM, P53, Mdm2, and P21(WAF/CIP1) proteins in 167 specimens of pancreatic carcinoma and 112 specimens of non-cancer pancreatic tissues was detected by tissue microarray and immunohistochemistry. RESULTS The positive rates of P53 and Mdm2 were higher in pancreatic carcinoma than in non-tumor pancreatic tissues (57.5% vs. 6.3%, 64.1% vs. 5.4%, P < 0.01), while the positive rates of ATM and P21(WAF/CIP1) were lower in pancreatic carcinoma than in non-tumor pancreatic tissues (67.7% vs. 82.1%, 39.5% vs. 71.4%, P < 0.05). ATM expression in pancreatic carcinoma was related to patients' age (P < 0.05). P53 expression was related to tumor differentiation, lymph node metastasis, and nerve involvement (P < 0.05). Mdm2 expression was related to tumor differentiation (P < 0.05). P21(WAF/CIP1) expression was related to patients' age and nerve involvement (P < 0.05). There were statistical correlations between these 4 proteins (P < 0.05). CONCLUSIONS Overexpression of P53 and Mdm2 and loss of ATM and P21(WAF/CIP1) expression may contribute to the tumorigenesis and development of pancreatic carcinoma. The 4 proteins may affect cell transformation and tumorigenesis through ATM-Mdm2-P53-P21(WAF/CIP1) pathway. Co-detection of P53 and Mdm2 can be used to evaluate the differentiation of pancreatic carcinoma.
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Affiliation(s)
- Guan-Zhen Yu
- Department of Pathology, Changhai Hospital, Shanghai, 200433, PR China
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Abstract
AIM: To investigate the contribution of HBV in the development of hepatocarcinoma by examining the effects of HBV on p53 function in SMMU-7721 cell line.
METHODS: Plasmid pCMVp53 was transfected or cotransfected with pCMVHBVa (wild-type HBV) or PCMVHBVb (mutation type HBV) into the hepatoma cell line SMMU-7721 by lipofectamine. Apoptosis cells were labeled with annexin V-FITC and confirmed by flow cytometry. Reporter plasmid PG13-CAT or p21-luc was cotransfected, respectively, into each group to determine the transactivation activity of p53 and its effect on p21 promoter. Western blot was performed to observe p53 expression in hepatoma cell line of each group.
RESULTS: The group transfected with pCMVp53 alone exhibited higher luciferase activity and higher apoptosis rate, otherwise, the p53 expression and reporter activity of PG13-CAT or P21-luc as well as cell apoptosis rate were obviously higher in the group cotransfected of pCMVp53 with pCMVHBVa, but not in the other cotransfected group.
CONCLUSION: Transient transfection of HBV into the SMMU-7721 cell line can enhance p53 expression and its effects on development of hepatocarcinoma.
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Affiliation(s)
- Jian-Hui Qu
- Department of Pathology, the Second Military Medical University, Shanghai 200433, China.
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Abstract
AIM: To investigate the inhibitory effect of tumor suppressor p33ING1b and its synergy with p53 gene in hepatocellular carcinoma (HCC).
METHODS: Recombinant sense and antisense p33ING1b plasmids were transfected into hepatoma cell line HepG2 with lipofectamine. Apoptosis, G0/G1 arrest, cell growth rate and cloning efficiency in soft agar of HepG2 were analyzed after transfection. In three hepatoma cell lines with different endogenous p53 gene expressions, the synergistic effect of p33ING1b with p53 was analyzed by flow cytometry and luciferase assay was performed to detect the activation of p53 downstream gene p21WAF1/CIP1. In addition, the expression and mutation rates of p33ING1b in HCC tissues were measured by immunohistochemistry and polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP).
RESULTS: Overexpression of p33ING1b inhibited cell growth of HepG2, induced more apoptosis and protected cells from growth in soft agar. Combined transfer of p33ING1b and p53 gene promoted hepatoma cell apoptosis, G0/G1 arrest and elevated expression of p21WAF1/CIP1. Immunostaining results showed co-localized p33ING1b with P53 protein in HCC tissues and there was a significant relation between protein expression rates of these two genes (P<0.01). Among 28 HCC samples, p33ING1b presented a low gene mutation rate (7.1%).
CONCLUSION: p33ING1b collaborates with p53 in cell growth inhibition, cell cycle arrest and apoptosis in HCC. Loss or inactivation of p33ING1b normal function may be an important mechanism for the development of HCC retaining wild-type p53.
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Affiliation(s)
- Zhi Zhu
- Department of Pathology, Changhai Hospital, Second Military Medical University, 174 Changhai Road, Shanghai 200433, China.
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Abstract
The effect of the extracts of Epimedium brevicornum Maxim. was investigated on proliferative activity in vitro. The osteoblast-like UMR106 cells was employed as an osteoblast model. The EtOH extract and the n-butanol fraction from the crude extract were found to show proliferation stimulating activity. Three flavonoid compounds (icariin, epimedin B and epimedin C) were isolated from this fraction by activity-guided assay, and the effects on cell proliferation were studied. Icariin produced the most significant promoting effect on the proliferation in osteoblast-like UMR106 cells. The results suggested that E. brevicornum Maxim. extracts might have potential activity against osteoporosis, and flavonoids such as icariin might be the active constituents stimulating osteoblasts.
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Affiliation(s)
- F H Meng
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
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Abstract
AIM: To detect the expression of p33ING1b protein and the change of p33ING1b gene in pancreatic carcinoma and to evaluate the significance of p33ING1b in pancreatic cell carcinogenesis.
METHODS: Pathological specimens from pancreatic carcinoma and matched non-tumor pancreatic tissues were examined for p33ING1b expression and mutation by immunohistochemistry, polymerase chain reaction single-strand conformation polymorphisms (PCR-SSCP) and loss of heterozygosity (LOH).
RESULTS: The rate of p33ING1b protein expression was 85% (34/40). A single germline missense mutation was detected in 1 of 40 tumors located at codon 215: TGC-TCC (Cys-Ser). Fourteen (60.9%) of 23 tumor samples showed LOH in all of the informative markers tested, but no mutation was detected in these tumors and only two of the informative tumors lacked expressions of p33ING1b protein.
CONCLUSION: Mutation and loss of expression are not the main reasons for the disfunction of p33ING1b in pancreatic carcinoma, an abnormality at the level of chromosome and/or transcription may inhibit their normal functions, potentially contributing to pancreatic cell carcinogenesis.
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Affiliation(s)
- Guan-Zhen Yu
- Department of Pathology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China
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15
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Qu JH, Zhu MH, Lin J, Ni CR, Li FM, Zhu Z, Yu GZ. [Interaction effect of p53 with HBV in hepatoma cell line SMMC-7721]. Zhonghua Gan Zang Bing Za Zhi 2004; 12:403-5. [PMID: 15268803] [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: 04/30/2023]
Abstract
OBJECTIVES To study the interaction of hepatitis virus B (HBV) and tumor suppressor p53. METHODS Plasmid pCMVp53 was transfected or cotransfected with pCMVHBVa (wild type HBV) or PCMVHBVb (mutant type HBV) into the hepatoma cell line SMMC-7721 by lipofectamine. Apoptosis cells were labeled by annexin V-FITC and confirmed by flow cytometry. Reporter plasmids PG13-CAT or p21-luc were cotransfected respectively in each group to indicate transactivation activity of p53 and it's effect on p21 promoter. Western blot was performed to observe p53 expression in each group. RESULTS The group transfected by pCMVp53 alone exhibit higher luciferase activity and higher apoptosis rate, otherwise, p53 expression, enzyme activity of PG13-CAT or p21- luc and cell apoptosis rate were much higher in the group cotransfected by pCMVp53 and pCMVHBVa, but not in the other cotransfected group; HBV replication was enhanced in p53 cotransfected group. CONCLUSION p53 expression and effects could be enhanced by HBV and p53 had positive regulation effect on HBV replication.
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Affiliation(s)
- Jian-Hui Qu
- Department of Pathology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China
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16
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Lin J, Zhu MH, Qu JH, Li FM, Ni CR. [Effects of hepatitis B virus X gene on p21(WAF1) expression through p53-dependent and p53-independent pathways]. Ai Zheng 2004; 23:749-55. [PMID: 15248906] [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: 04/30/2023]
Abstract
BACKGROUND & OBJECTIVE It was reported that the hepatitis B virus X could inhibit the function of p53 and have contrary effects on p21(WAF1), a downstream gene of p53, but the mechanism is not clear up to now. So this study was designed to investigate HBx's effect on p21(WAF1) gene. METHODS After co-transfection of sense or antisense wild type p53 gene (wtp53) with HBx into SMMC-7721 and HBx alone transfection into other hepatoma cell lines with different endogenous status of p53, we evaluated the luciferase expression level under the p21(WAF1) promoter by detecting the luciferase activity and alteration of cell cycle in these transfected cell lines by flow cytometry. Expressions of p53 and p21 (WAF1) in hepatoma cells after transfected with HBx were also estimated by Western blot analysis. RESULTS The luciferase activity (1.007+/-0.098) in SMMC-7721 cells cotransfected with HBx and sense-wtp53 was higher than that in cells with wtp53 gene alone (0.490+/-0.012, P< 0.05), and also was depressed in the other experimental groups transfected with HBx (P< 0.05). Western blot analysis showed that after transfected with HBx, p53 expression was elevated in all hepatoma cell lines with different endogenous status of p53, and the expression of p21(WAF1) and luciferase activity under the p21(WAF1) promoter (0.053+/-0.010 vs. 0.094+/-0.013, P< 0.05) were both decreased in SMMC-7721 cells with low expression of p53, but relatively increased in HepG2 cell line with high expression of p53 (1.252+/-0.052 vs. 0.767+/-0.031, P< 0.05). Flow cytometry showed that fewer SMMC-7721 (42.31%) and Hep3B (36.96%) cells were arrested in G(0)/G(1) phase in transiently transfected HBx groups than in the control groups (47.10% and 42.90%), which was the opposite case in HepG2 cell line (63.62% vs. 57.42%). Moreover, after stably transfected with pcDNA3HBx, HepG2 cells reduced in G(0)/G(1) phase in compared with the control group (57.31% vs 61.49%). CONCLUSION HBx may not only increase the expression of p21(WAF1) by introducing the accumulation of p53 in cytoplasm but also inhibit the transcriptional activity of p21(WAF1) promoter in a p53-independent manner.
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Affiliation(s)
- Jing Lin
- Department of Pathology, Changhai Hospital, The Second Military Medical University, Shanghai, 200433, P.R.China
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17
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Qu JH, Zhu MH, Lin J, Ni CR, Li FM, Zhu Z, Yu GZ. [Interaction of p53 with p53 response element like binding sequence at upstream of hepatitis B virus enhancer I]. Ai Zheng 2004; 23:502-7. [PMID: 15142443] [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: 04/29/2023]
Abstract
BACKGROUND & OBJECTIVE A p53 response element like binding sequence, 5'-TGCC(G)T-TGCCT-3' was found at upstream of hepatitis B virus (HBV) enhancer I from 1047 to 1059 nucleotides after analyzing the HBV genome by a computer program in our previous work. It indicated that the sequence could specifically bind P53 protein in vitro by electrophoretic mobility shift assay (EMSA) and electrophoretic mobility supershift assay (EMSSA). This study was designed to further investigate the interaction between P53 and p53 response element like binding sequence at upstream of HBV enhancer I. METHODS HBV x gene enhancer and promoter which contains p53 response element like binding sequence TGCGT-TGCCT was in upstream of CAT enzyme in pX-CAT reporter plasmid. Firstly, we designed a point mutation in pX-CAT which change TGCGT TGCCT into TGTAT. TGTAT by polymerase chain reaction (PCR) in order to damage the p53 response element like sequence. After pX-CAT or mutation pX-CAT (mpX-CAT) transfected alone or cotransfected with pCMVp53 into HepG2 hepatoma cell, CAT activity was assayed to confirm the correlation of p53 protein with this DNA sequence. In addition, an antisense sequence corresponding to the p53 response element like sequence in HBV was reconstructed into the pZeoSV2 vector (alpha pZeoXP) and transfected into HepG2.2.15 cell line to block the binding of P53 with this sequence, the stable transfected HepG2.2.15 cell was observed about P53/P21 expression, cell cycle distribution and apoptosis rates. RESULTS CAT enzyme of HepG2 had an higher expression in cotransfection with pCMVp53 and pX-CAT than alone pX-CAT (1.353 VS 0.738,P< 0.05), but it was lower in mpX-CAT(0.304) and pCMVp53 (0.402). Compared with the control group, P53/P21 expression and cell apoptosis rate decreased greatly in the stable transfected alpha pZeoXP HepG2.2.15 cell line (0.95% VS 7.84%), the cell number in S phase increased in the same cell line (16.37% VS 9.48%). CONCLUSION Reporter gene expression of pX-CAT in intracellular could be promoted by P53, which further suggest that P53 could bind TGCC(G)T-TGCCT in upstream of HBV enhancer I and induce a prolonged P53 half life. Subsequently, P53 and p21 protein (downstream gene of P53) would have a higher expression and stronger activity.
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Affiliation(s)
- Jian-Hui Qu
- Department of Pathology, Changhai Hospital, The Second Military Medical University, Shanghai, 200433, PR China
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18
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Zhu MH, Ni CR, Zhu Z, Li FM, Zhang SM. [Determination of expression of eight p53-related genes in hepatocellular carcinoma with tissue microarrays]. Ai Zheng 2003; 22:680-5. [PMID: 12866955] [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: 03/03/2023]
Abstract
BACKGROUND & OBJECTIVE Hepatocarcinogenesis was a multistage process involving a number of genes. Molecular biological studies indicated that abnormal expression of p53 gene family is correlated with the development of hepatocellular carcinoma (HCC). This study was designed to investigate the expression difference and its clinicopathologic significance of eight kinds of p53-related oncogenes and tumor-suppressor genes in HCC and adjacent-tumor liver tissues using tissue microarray technique. METHODS The HCC tissue microarrays comprised 273 cases of HCC tissues, 144 adjacent-tumor liver tissues, and 10 normal liver tissues obtained from autopsy. The diameter of each specimen on tissue microarrays was 2.0 mm. Immunohistochemistry was employed to detect the expression of p16(INK4a), p21(WAF1), p33(ING1b), p53, p57(KIP2), p73, mdm2, and ATM genes in tumor and adjacent tumor liver tissue, respectively. The relationship between HBV infection rate and the expression of these genes was also analyzed. RESULTS Three paraffin-embedded HCC tissue microarrays were successfully constructed, composed of 136, 143, and 148 tissue dots, respectively. The positive staining rates of these eight genes in HCC and surrounding-tumor tissues were: (p16(INK4a)) 35.9% and 9.0%, (p21(WAF1)) 41.8% and 11.1%, (p33(ING1b)) 43.65% and 14.6%, (p53) 46.2% and 12.5%, (p57(KIP2)) 39.2% and 16.7%, (p73) 9.5% and 2.8%, (mdm2) 41.4% and 9.0%, (ATM) 6.6% and 1.4%, respectively. The expression of all these genes in HCC were stronger than that in the surrounding-tumor liver tissues (P< 0.05). The expression differences of these genes in HCC tissues with varied differentiated grades were not significant(P >0.05). Except p16(INK4a), p21(WAF1), and p73 genes(P >0.05), the expression of p33(ING1b), p53, mdm2, ATM, and p57(KIP2) genes in HCC with portal vein invasion were higher than those in HCC without portal vein invasion (p33(ING1b), p53, mdm2, ATM, P< 0.01; p57(KIP2), P< 0.05). The infection rate of HBV did not have a significant correlation to the expression of these eight genes (P >0.05). CONCLUSION Tissue microarray technique had the advantage of high-throughput in the detection of HCC-related oncogenes and tumor-suppressor genes, which can analyze larger amounts of specimens, more target genes, and cost less working time.
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Affiliation(s)
- Ming-Hua Zhu
- Department of Pathology, Changhai Hospital, Second Military Medical University, Shanghai, 200433, PR China.
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19
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Liu ZP, Wang PN, Yang WD, Zheng JB, Li FM. [Spectroscopic study on the high voltage fast pulsed discharge of nitrogen, ammonia or their mixture]. Guang Pu Xue Yu Guang Pu Fen Xi 2001; 21:637-640. [PMID: 12945317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The emission spectra from the pulsed discharge plasma of nitrogen, ammonia or their mixture were measured. In the discharge of pure nitrogen gas, as the pressure increased, the discharge volume decreased and more dissociation of nitrogen molecules occurred due to the higher energy density. In the discharge of ammonia, N,N+ and NH+ were observed, but no NH2 and NH3 were detected, indicating that ammonia, which has the lower dissociation and ionization energies as compared to nitrogen, was highly dissociated. The discharge of the mixture of N2 and NH3 was also studied. The dependence of the dissociation of nitrogen on the ratio of nitrogen to ammonia was investigated by emission spectra. The optimal ratio for nitrogen dissociation was obtained. The advantage of using the mixture of nitrogen and ammonia in the synthesis of nitrides was discussed.
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Affiliation(s)
- Z P Liu
- State Key Joint Lab for Materials Modification by Triple Beams, Department of Physics, Fudan University, Shanghai 200433, China
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20
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Wang WJ, Lu XZ, Xu JH, Jiang YQ, Liu X, Wang GM, Li FM, Cai ZG, Qiu ZR, Zhou JY. [Investigation on the excited state dynamics properties of hemicyanine molecules]. Guang Pu Xue Yu Guang Pu Fen Xi 2001; 21:591-593. [PMID: 12945303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In this paper, the excited state dynamics properties of hemicynine were investigated by using time-resolved fluorescence and 3D fluorescence spectra techniques. The interaction of hemicyanine molecules caused formation of H-aggregates and a blue shift of the 3D fluorescence spectra in interleaving hemicyanine/arachidic acid multilayers. The peak of fluorescence was a red shift along with the time decay. The lifetime of the LB fluorescence was much shorter and the difference of beginning luminescence was less than that of the hemicyanine solution due to the stronger intermolecule interactions in the aggregates.
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Affiliation(s)
- W J Wang
- State Key Joint Lab for Materials Modification by Laser, Ion and Electron Beams, Department of Physics, Fudan University, Shanghai 200433, China
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Tian J, Huang G, Zhao HQ, Li FM. [Determination of puerarin in three traditional Chinese patent medicines by high performance liquid chromatography]. Se Pu 2001; 19:457-60. [PMID: 12545446] [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: 02/28/2023] Open
Abstract
A simple and accurate reversed-phase high performance liquid chromatographic method to determine puerarin in three traditional Chinese patent medicines, namely "Xiao'er qingganling" tablet, "Buchang xinnaoxintong" capsulae and "Ganmao qingre" granule is described. "Xiao'er qingganling" tablet and "Buchang xinnaoxintong" capsulae were extracted with methanol in an ultrasonic bath and "Ganmao qingre" granule was extracted with water and ethanol. After being centrifuged and filtered, the samples were separated on an ODS column with a mobile phase of 100 mmol/L ammonium acetate buffer (pH 5.0)-methanol(75:25, volume ratio). The flow rate was 0.8 mL/min, and the detection wavelength was 250 nm. The calibration curve was linear in the range of 2 mg/L-20 mg/L puerarin (r = 0.9999). The average recoveries were 99.0%, 93.4% and 97.5% for "Xiao'er qingganling" tablet, "Buchang xinnaoxintong" capsulae, "Ganmao qingre" granule respectively. The average contents of puerarin in the medicines were 3.48 mg/g, 1.08 mg/g and 1.52 mg/g (sucrose), and the relative standard deviations were 1.9%, 1.4% and 1.4% respectively.
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Affiliation(s)
- J Tian
- Shenyang Pharmaceutical University, Shenyang 110016, China
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22
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Qiao MX, Guo XJ, Li FM. [Determination of unbound concentration of drug in drug-human serum albumin mixture by high performance frontal analysis]. Se Pu 2001; 19:329-31. [PMID: 12545492] [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: 02/28/2023] Open
Abstract
A high performance frontal analysis(HPFA) method was developed to determine the unbound concentration of drugs in drug-human serum albumin (HSA) mixture under binding equilibrium. The sample was injected directly onto an internal-surface reversed-phase silica column (ISRP). The mobile phase was 67 mmol/L phosphate buffer (pH 7.4, I = 0.17 mol/L). When a large volume of sample solution under drug-HSA binding equilibrium was directly injected, the drug was eluted as a trapezoidal peak with a plateau, and the drug concentration in this region was the same as that of the unbound drug in the sample solution. The eluate of plateau region was collected and a small volume was injected onto a reversed-phase HPLC column. This HPFA-HPLC method was employed in the determination of unbound concentration in both ketoprofen (KP)-HSA and cefoperazone (CP)-HSA mixtures. The unbound concentrations of drugs obtained by using HPFA-HPLC were compared with those determined with ultrafiltration-HPLC. The effects of sample volume and flow rate of mobile phase on the plateau formation were investigated. It was found that the minimum injection volume to achieve a trapezoidal peak varied with drugs. The flow rate showed no effect on the trapezoidal peak formation. The unbound concentrations of KP and CP obtained were about the same by using HPFA-HPLC or ultrafiltration-HPLC and precisions were similar for both methods.
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Affiliation(s)
- M X Qiao
- Shenyang Pharmaceutical University, Shenyang 110016, China
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23
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Guo XJ, Wei ZY, Li FM. [Determination of bifonazole in cream by high performance liquid chromatography]. Se Pu 2001; 19:279-80. [PMID: 12541819] [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: 02/28/2023] Open
Abstract
An accurate method for the determination of bifonazole in cream is described. The analytical column was packed with Hypersil ODS. The mobile phase was a mixture of 0.08 mol/L aqueous triethylamine (TEA) phosphate solution(pH 7.0)-acetonitrile-methanol (20:10:70, V/V) and the detection wavelength was 254 nm. This method is simple, accurate and can be used for the quality control of bifonazole in cream.
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Affiliation(s)
- X J Guo
- Shenyang Pharmaceutical University, Shenyang 110015, China
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Yu LN, Li FM. [HPCE determination of trimebutine maleate in rat plasma and its pharmacokinetics]. Yao Xue Xue Bao 2001; 36:131-3. [PMID: 12579881] [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: 02/28/2023]
Abstract
AIM To develop a method for the determination of trimebutine maleate in rat plasma by using high performance capillary electrophoresis. The method was employed to pharmacokinetic analysis of trimebutine maleate. METHODS Plasma samples were deproteinized with acetonitrile (containing ephedrine hydrochloride as internal standard) and the supernatant was dried under N2 stream at 50 degrees C. The residue was dissolved with methanol-water (1:1) and injected into the capillary by siphon. The electrophoresis was performed in uncoated fused-silica capillary and the voltage was 10 kV. The running buffer was 0.03 mol.L-1 NaH2PO4(pH 6.0). The eluate was detected at 214 nm by UV detection. RESULTS The recovery for trimebutine maleate in rat plasma was 72.8%-87.9%. The calibration curve in plasma was linear over the range 5-200 micrograms.L-1. The limit of quantitation was 5 micrograms.L-1. The intraday relative standard deviation (n = 6) and the interday relative standard deviation (n = 18) were less than 14%. The highest concentration in plasma was observed at 30 min after ig trimebutine maleate to rats. The pharmacokinetic results were AUC0-infinity = 8 micrograms.min.mL-1, T1/2(Ke) = 173 min and Ke = 5.6 x 10(-3) min-1. CONCLUSION The method is accurate, sensitive and suitable for pharmacokinetic study of trimebutine maleate.
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Affiliation(s)
- L N Yu
- Shenyang Pharmaceutical University, Shenyang 110015, China
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Gao XY, Wang DW, Li FM. [Determination of ecdysterone in Achyranthes bidentata Bl. and its activity promoting proliferation of osteoblast-like cells]. Yao Xue Xue Bao 2000; 35:868-70. [PMID: 11218869] [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: 02/19/2023]
Abstract
AIM To study the activity of ecdysterone from Achyranthes bidentata Bl. (AB) promoting proliferation of osteoblast-like (OB-like) UMR106 cells and to determine its content in AB by HPLC method. METHODS Ecdysterone isolated from AB was cultured with OB-like cells UMR106 together in vitro and the proliferation of OB-like cells was determined by MTT assay. The chromatographic conditions for determining ecdysterone included an ODS column (250 mm x 4.6 mm, 5 microns), a mobile phase consisting of a mixture of water-acetontrile-tetrahydrofuran (86:11:3), detection wavelength of 243 nm, and column temperature of 27 degrees C. Phenacetin was used as the internal standard. RESULTS The ecdysterone from AB had significant activity promoting proliferation of OB-like cells, the proliferation was promoted by 41% (n = 3). The average recovery of ecdysterone was 96.2% (RSD = 2.1%), the calibration was linear in the range of 30-300 micrograms.mL-1 (gamma = 0.9998). CONCLUSION Ecdysterone was screened quickly by cultivating with OB-like cells together in vitro. The HPLC method is accurate, fast and reproducible for the determination of ecdysterone in AB.
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Affiliation(s)
- X Y Gao
- Shenyang Pharmaceutical University, Shenyang 110015, China
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26
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Li FM, Qiu F, Wang WH, Guo XJ, Di X. [Determination of three principal components in chuanjing tablets by using high performance liquid chromatography]. Se Pu 2000; 18:442-4. [PMID: 12541708] [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: 02/28/2023] Open
Abstract
Uniform design method was employed to optimize the mobile phase of HPLC in order to determine simultaneously three principal components, theophylline, amobarbital and methylephedrine hydrochloride, in Chuanjing tablet, a compound preparation for asthma and cough. The stationary phase was ODS and the optimal mobile phase composition was V (0.015 mol/L phosphate buffer containing 0.3% triethylamine, pH 4.9): V (methanol) = 35:65. The detection was performed at 215 nm and the sensitivity was time programmed for simultaneous determination of minor and major components. Caffeine was selected as the internal standard. A baseline separation was achieved within 10 min. The linear ranges for theophylline, amobarbital and methylephedrine hydrochloride were 0.03 g/L-0.20 g/L, 7.5 mg/L-50.0 mg/L and 7.5 mg/L-50.0 mg/L, recoveries 99.7%-102.6%, 98.5%-100.2% and 98.0%-102.7%, inter-day RSDs 0.23%-1.2%, 0.35%-2.5%, 0.33%-1.6% respectively. This HPLC method is rapid and accurate, and suitable for the quality control of the preparation.
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Affiliation(s)
- F M Li
- Department of Analytical Chemistry, Shenyang Pharmaceutical University, Shenyang 110015, China.
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Abstract
Poly[2-(beta-D-glucosyloxy)ethyl acrylate] (PGEA) was prepared by radical polymerization of 2-(2',3',4',6'-tetra-O-acetyl-beta-D-glucosyloxy)ethyl acrylate (AcGEA) followed by O-deacetylation. Fluorescence measurements revealed that PGEA tended to associate into aggregates in an aqueous medium. The critical aggregation concentration (cac) of PGEA in water was determined by using N-phenyl-1-naphthalamine (PNA) as a fluorescent probe. The dependence of cac on the molecular weight of PGEA and temperature was observed. A copolymer of GEA with a hydrophobic monomer, i.e., stearyl acrylate (SA), was also synthesized in order to increase the hydrophobicity of PGEA and to understand the hydrophobic effect on cac. It was found that the cac of P(GEA-co-SA) was much lower than that of PGEA, and it decreased with increasing ratio of SA in the copolymer. Size-exclusion chromatography (SEC), dynamic light scattering (DLS), and transmission electron microscopy (TEM) measurements indicated that the aggregates have hydrophobic interiors; they were spherical in shape and their sizes varied in a broad range. This phenomenon was explained in terms of a combination of hydrophobic interaction and cooperative hydrogen bonding. Copyright 2000 Academic Press.
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Affiliation(s)
- YZ Liang
- Department of Polymer Science & Engineering, College of Chemistry, Peking University, Beijing, 100871, China
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Sun SY, Li FM. [Isolation and identification of three steroid compounds from Mauremys mutics plastron]. Zhongguo Zhong Yao Za Zhi 2000; 25:165-6. [PMID: 12212101] [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: 02/26/2023]
Abstract
OBJECTIVE To investigate the steroids components from extract of Mauremys mutics. METHOD The steroid compounds were isolated by using vacuum liquid chromatography and PTLC. The structures of three compounds were determined by spectral, chromatographic and chemical analysis. RESULTS Three steroids were isolated from M. mutics and identified as cholesterol, elcosenoic acid cholesterol ester, cholester-4-ene-3-one. CONCLUSION All the three compounds were isolated from M. mutics for the first time.
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Affiliation(s)
- S Y Sun
- Shenyang Pharmaceutical University, Shenyang 110015, Liaoling, China
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Schultz CS, Rodriguez RA, Chew EA, Dimaano C, Li FM, Santos MD, Nieto MC. Effects of beta2-microglobulin mutations on the alpha-1 helical region of H2-Ld. Immunogenetics 1998; 48:273-82. [PMID: 9716647 DOI: 10.1007/s002510050432] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Beta-2 microglobulin (beta2m)has been shown to have an effect on the structural and functional constraints that facilitate proper class I antigen presentation. To date, no evidence has pinpointed the beta2m-specific amino acids that play an integral role in affecting structure in and around the peptide binding region of class I. To delineate beta2m amino acid positions that affect the alpha-1 helical region, we generated a series of mutant beta2m proteins bearing precise amino acid substitutions. The amino acid positions chosen were based upon previous results which demonstrated that human beta2m association with H2-Ld altered the structure of the alpha-1/alpha-2 super-domain. beta2m mutant proteins were used in beta2m exchange assays with cells expressing H2-Ld. Following exchange, cells were assayed to determine whether mutant beta2m association resulted in structural alteration of class I extracellular domains. The alteration in H2-Ld structure was evidenced by an increase in the binding of an antibody (34-1-2), specific for the alpha-1 helical region of H2-Ld. Results demonstrated that amino acid substitutions in beta2m positions 33 and 53 led to a dramatic increase in the reactivity of the alpha-1 domain-specific antibody 34-1-2. Identifying beta2m amino acid positions that influence the structure of the peptide binding region may allow for a better understanding of cellular immune responses that center upon class I/beta2m expression.
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Affiliation(s)
- C S Schultz
- Department of Biological Sciences, California State University, Hayward, 25800 Carlos Bee Blvd., Hayward, CA 94542, USA
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Ren ZM, Du YC, Qiu Y, Wu JD, Ying ZF, Xiong XX, Li FM. Carbon nitride films synthesized by combined ion-beam and laser-ablation processing. Phys Rev B Condens Matter 1995; 51:5274-5277. [PMID: 9979406 DOI: 10.1103/physrevb.51.5274] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Qi Y, Li FM. [Development of the lens and zonulae in the human embryo]. Zhonghua Yan Ke Za Zhi 1992; 28:44-6. [PMID: 1499434] [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: 12/27/2022]
Abstract
The embryonic development and ultrastructures of the lens and zonulae in 212 eyes of 131 human embryos were studied by light and electronic microscopy, with the finding that the capsule and zonulae appeared earlier than previously reported. The laminate structure of the capsule was observed in the 7 week embryo, and the early structures of zonulae were discernible in the 10th week on the basement membrane of the non-pigmental epithelium of the ciliary body and on the capsule, indicating that the capsule was specialized basement membrane of the lenticular epithelial cells, and the zonulae originated from the non-pigmental epithelium of the ciliary body and the capsule of lens.
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Affiliation(s)
- Y Qi
- Department of Ophthalmology, Third Teaching Hospital, Beijing Medical University
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Qi Y, Li FM. [The embryonic development of iridial muscles]. Zhonghua Yan Ke Za Zhi 1991; 27:295-8. [PMID: 1815925] [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: 12/28/2022]
Abstract
Development of iridial muscles was observed in 116 fetal eyes (72 human embryos 7 weeks to full gestation). Bundles of microfilaments with local high density spots appeared in the cytoplasm of the anterior pigment epithelium early in 10 week embryos. The high density spots later grew to be the dense-bodies in the myofilaments, the original structure of the pupillary sphincter. In embryos of 4 1/2 months, blood capillaries grew into the sphincter, which was fully developed in the 6th month, and myofilaments of the dilator muscles began to appear in the cytoplasm of peripheral anterior pigment epithelium, with villous protrusions toward the stroma. Many myofilaments with scattered dense-bodies were seen in the protrusions. It was thus confirmed that both the sphincter and dilator muscles originated from the iridial anterior pigment epithelium of neuro-ectoderm; however, the former developed fully to form independent smooth muscle bundles, while the latter was less developed and remained part of the pigment epithelium (myo-epithelium). The appearance of both muscles was earlier than previously reported.
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Affiliation(s)
- Y Qi
- Department of Ophthalmology, Third Teaching Hospital, Beijing Medical University
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Sato H, Kojima J, Nakajima A, Morita T, Noishiki Y, Gu ZW, Li FM, Feng XD. Study on antithrombogenicity of poly[beta-(acetylsalicylyloxy)ethyl methacrylate] relative to poly(hydroxyethyl methacrylate). J Biomater Sci Polym Ed 1991; 2:1-13. [PMID: 1863573 DOI: 10.1163/156856291x00016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The antithrombogenicity of a polymer made of aspirin bound to hydroxyethyl methacrylate (HEMA), abbreviated as ASA-polymer, was compared with that of poly(hydroxyethyl methacrylate) (PHEMA). Platelet from platelet rich plasma (PRP) incubated with ASA-polymer surface exhibited noticeable decreases in adhesion and aggregation as compared to platelets incubated with PHEMA. Low molecular weight components other than aspirin, which may be released from ASA-polymer during the incubation with PRP, or contact with ASA-polymer causing denaturation of platelets without morphological changes could be responsible for the decrease of adhesion and aggregation. Both PRP and PPP exposed to ASA-polymer-coated surfaces exhibited a much smaller partial thromboplastin time (PTT) than if exposed to PHEMA-coated surfaces; the PTT of ASA-polymer was similar to that of glass exposed plasma. With respect to the in vivo antithrombogenicity, the ASA-polymer surface led to thrombus formation. This may be due to the partial hydrolysis of the acetyl groups resulting in the formation of a negatively charged surface which in turn accelerates the coagulation cascade despite its inhibitory effects on platelet adhesion and aggregation. On the other hand, neointima formed around a thrombus layer on PHEMA-coated sutures after 14 days.
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Affiliation(s)
- H Sato
- Research Center for Medical Polymers and Biomaterials, Kyoto University, Japan
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Abstract
A simple method for the preparation and reversed-phase high-performance liquid chromatographic separation of hexacarboxylic porphyrinogen isomers is described. Uroporphyrin I or III was partially decarboxylated in 0.5 M hydrochloric acid at 150 degrees C. Unreacted uroporphyrin and the hepta-, hexa- and pentacarboxylic porphyrins formed were esterified and then group-separated by thin-layer chromatography. After hydrolysis, the porphyrins were reduced to the corresponding porphyrinogens with 3% (w/w) sodium amalgam. The hexacarboxylic porphyrinogens were separated on an ODS-Hypersil column by elution with acetonitrile-methanol-1 M ammonium acetate, pH 5.16 (8:12:80, v/v/v) as mobile phase. Isomers were identified by high-performance liquid chromatography of the characteristic mixture of two pentacarboxylic porphyrins formed after partial decarboxylation of individual isomers. Except for the two type I isomers, resolution of the hexacarboxylic porphyrinogens was superior to that of the corresponding porphyrins.
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Affiliation(s)
- F M Li
- Division of Clinical Cell Biology, MRC Clinical Research Centre, Harrow, Middlesex, U.K
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Fu J, Li FM. [Embryonic development and structure of human Bruch's membrane]. Zhonghua Yan Ke Za Zhi 1989; 25:18-9. [PMID: 2503334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A morphological study of Bruch's membrane was performed on 61 human embryonic and fetal eyes by transmission and scanning electron microscopy. The basement membrane of retinal pigment epithelium could be identified in the 5 week embryo. At the 11th week, the five components of Bruch's membrane were all discernible. The features of the five components were topographically examined by scanning electron microscopy.
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Zhao YN, Li FM, Xia JL. [Microangio-architecture of optic disc]. Yan Ke Xue Bao 1988; 4:150-5, 171. [PMID: 3240822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Abstract
Techniques for the analysis of porphyrins in the biomedical fields are reviewed. The emphasis is on high-performance liquid chromatography and its aspplications in: (1) the quantitative analysis of porphyrins in blood, urine and faeces; (2) qualitative porphyrin profiles in normal subjects and in the porphyrias; (3) assay of haem biosynthetic enzyme activities and (4) resolution of type isomers of porphyrins and porphyrinogens. Detection systems, quantitation methods, peak identification and sample preparation procedures are discussed.
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Affiliation(s)
- C K Lim
- Division of Clinical Cell Biology, MRC Clinical Research Centre, Harrow, Middlesex, U.K
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Abstract
A rapid, reliable, sensitive and reproducible HPLC method was developed for the assay of ferrochelatase activity in rat liver. The assay was carried out aerobically with Zn2+ and mesoporphyrin or protoporphyrin IX as substrates. Zn-porphyrins formed were extracted with dimethyl sulphoxide/methanol (30:70, v/v) containing Zn-deuteroporphyrin as the internal standard for separation and quantification by reversed-phase chromatography. The Km for mesoporphyrin was 5.9 microM, for protoporphyrin IX 8.8 microM and for zinc 6.0 microM. The specific activities were 33.1 +/- 5.0 nmol Zn-mesoporphyrin or 13.4 +/- 2.0 nmol Zn-protoporphyrin formed per hour per mg of protein for mitochondria and 12.3 +/- 2.2 nmol Zn-mesoporphyrin or 4.6 +/- 0.9 nmol Zn-protoporphyrin per hour per mg of protein for liver homogenate.
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Affiliation(s)
- F M Li
- Division of Clinical Cell Biology, MRC Clinical Research Centre, Harrow, Middlesex, UK
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Abstract
The autofluorescence spectra of human tissues excited with the 365-nm line of pulsed xenon ion laser have been measured. The autofluorescence spectra of cancer tissues usually show characteristic peaks near 630 nm and 690 nm, which do not appear in the spectra of the corresponding normal tissues. This characteristic fluorescence can be taken as a criterion for cancer diagnosis; a consistency of 89% with the traditional biopsy method has been obtained in preliminary clinical application to the diagnosis of buccal carcinoma. Spectroscopic investigations suggest that the porphyrin compounds localized and retained in cancer tissues might be responsible for this characteristic autofluorescence.
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Affiliation(s)
- Y L Yang
- Physics Department, Fudan University, Shanghai, China
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Lu SH, Ohshima H, Fu HM, Tian Y, Li FM, Blettner M, Wahrendorf J, Bartsch H. Urinary excretion of N-nitrosamino acids and nitrate by inhabitants of high- and low-risk areas for esophageal cancer in Northern China: endogenous formation of nitrosoproline and its inhibition by vitamin C. Cancer Res 1986; 46:1485-91. [PMID: 3943105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A total of 238 samples of 24-h urine were collected from inhabitants of high-risk (Lin-xian) and low-risk (Fan-xian) areas for esophageal cancer in northern China, according to three protocols: (a) from undosed subjects; (b) from subjects who had ingested 100 mg L-proline three times a day 1 h after each meal; and (c) from subjects in Lin-xian who had ingested 100 mg ascorbic acid together with 100 mg L-proline three times a day 1 h after each meal. As an index of individual exposure to N-nitroso compounds or their precursors, ingested in food and/or formed endogenously, the levels of four urinary N-nitrosamino acids and nitrate were determined. The amounts of N-nitrosoproline, N-nitrosothiazolidine 4-carboxylic acid, N-nitrososarcosine, and nitrate excreted in the 24-h urine of undosed subjects in Lin-xian were significantly higher than those in Fan-xian, indicating a higher exposure of the inhabitants in the high-risk area to N-nitroso compounds and their precursors. Ingestion of L-proline resulted in a marked increase in urinary N-nitrosoproline levels in inhabitants from both areas, suggesting that endogenous nitrosation may occur to a larger extent when appropriate amine precursors are ingested in foods. Intake of moderate doses of ascorbic acid by high-risk subjects effectively reduced the urinary levels of N-nitrosamino acids to those found in undosed subjects in the low-risk area. If N-nitroso compounds formed in vivo are among the causative factors for esophageal cancer in this area of northern China, ascorbic acid appears to be effective in lowering the body burden of these carcinogenic compounds, thus offering a rational basis for long-term intervention studies in this area.
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Zhang HR, Li FM. [Fluorescein angiography and pathological study of cystoid macular edema]. Yan Ke Xue Bao 1985; 1:151-6. [PMID: 3880148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Li FM. [Experimental and clinical observations on fundus fluorescein angiography]. Zhonghua Yan Ke Za Zhi 1984; 20:87-90. [PMID: 6435972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Gu ZW, Li FM, Feng XD, Voong ST. Studies on the hydrolysis of biocompatible acrylic polymers having aspirin-moieties. Biomater Med Devices Artif Organs 1983; 11:211-9. [PMID: 6667325 DOI: 10.3109/10731198309118807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Both the homogeneous and heterogeneous hydrolysis of five new acrylic polymers having aspirin-moieties, i.e. polymers of beta-(acetylsalicylyloxy)ethyl methacrylate, beta-(acetylsalicylyloxy) propyl methacrylate,beta-(acetylsalicylyloxy) ethyl acrylate, beta-hydroxy-gamma-(acetylsalicylyloxy) propyl methacrylate, beta-hydroxy-gamma-(acetylsalicylyloxy) propyl acrylate were investigated in acidic or alkaline medium at 30 degrees C or 60 degrees C, respectively. It was observed that the chief hydrolyzed product is always aspirin with minor amount of salicylic acid.
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