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Zeng S, Chen Z, Huang L, Li C, Wang P, Qin D, Gao L. A highly efficient and selective rapid detection method applied to the detection of amide herbicides in fish serum. Food Chem 2024; 449:139215. [PMID: 38581791 DOI: 10.1016/j.foodchem.2024.139215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 03/27/2024] [Accepted: 03/31/2024] [Indexed: 04/08/2024]
Abstract
Misuse of amide herbicides in the fisheries environment can pose unpredictable harm to aquatic products and ultimately human health. Thus, the development of a real-time, rapid on-site detection method is crucial. This study proposes for the first time, a paper-based visual detection method for amide herbicides in fish serum, by coating the molecularly imprinted polymer layer onto quantum dots, prepared fluorescent sensing materials (QDs@MIPs) for the detection of amide herbicides in aquatic products. These materials specifically cause fluorescence quenching in the presence of amide herbicides resulting in a color change. For practical application, this research designed a rapid test strip based on QDs@MIPs, meanwhile, incorporate a smartphone or a fluorescence spectrophotometer for qualitative and quantitative measurements, the limit of detection ranges of 0.061-0.500 μM. The method can be used for on-site evaluation of aquatic products, providing new technology for monitoring the safety of aquatic products.
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Affiliation(s)
- Sili Zeng
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Li Huang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Chenhui Li
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China; Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100141, China
| | - Lei Gao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China; Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100141, China; College of Chemistry, Chemical Engineering and Resource Utilization, Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin, China.
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2
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Zeng S, Li C, Huang L, Chen Z, Wang P, Qin D, Gao L. Carbon Nanotube-Supported Dummy Template Molecularly Imprinted Polymers for Selective Adsorption of Amide Herbicides in Aquatic Products. Nanomaterials (Basel) 2023; 13:nano13091521. [PMID: 37177066 PMCID: PMC10180091 DOI: 10.3390/nano13091521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/07/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023]
Abstract
In this study, a carbon nanotube (CNTs)-supported dummy template molecularly imprinted polymer (DMIPs) material was synthesized and utilized for the detection of amide herbicides in aquatic products via matrix solid-phase dispersion technology (MSPD). The DMIPs material was characterized, and its adsorption kinetics and isotherm were determined, the adsorption model was established, and the selective adsorption coefficient was calculated. The extract parameters of the method were optimized and successfully employed for the separation, analysis and detection of real samples, with satisfactory detection limits and linear ranges obtained. By comparing with other methods, the CNTs@DMIPs combined with MSPD technology established in our study can effectively solve false negative problems caused by insufficient destructive force, using dummy template molecules can also address the issue of false positives caused by template molecule leakage in molecular imprinting. Overall, the method is appropriate for the separation and detection of endogenous substances from highly viscous and poorly dispersed samples and is used as a routine detection tool in the aquaculture industry.
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Affiliation(s)
- Sili Zeng
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China
| | - Chenhui Li
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Li Huang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
- Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100141, China
| | - Lei Gao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
- Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin 150070, China
- Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100141, China
- College of Chemistry, Chemical Engineering and Resource Utilization, Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 26 Hexing Road, Harbin 150070, China
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3
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Wang S, Luo L, Zhang R, Guo K, Bai S, Qin D, Zhao Z. Comparison of edible yield and quality of female Chinese mitten crab between two-year-old and three-year-old. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2022.104687] [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: 10/18/2022]
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4
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Gao L, Wang P, Chen Z, Hao Q, Bai S, Du N, Li C, Huang X, Qin D. Application of solid‐phase extraction: High‐resolution mass spectrometry analysis strategy in the characterization and quantification of amide herbicides in aquatic products. Electrophoresis 2022; 43:1455-1465. [DOI: 10.1002/elps.202100384] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 03/29/2022] [Accepted: 04/01/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Lei Gao
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
- Key Laboratory of Control of Quality and Safety for Aquatic Products Ministry of Agriculture and Rural Affairs Beijing P. R. China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
| | - Qirui Hao
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
| | - Shuyan Bai
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
| | - Ningning Du
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
| | - Chenhui Li
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
| | - Xiaoli Huang
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences Harbin P. R. China
- Supervision Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin) Ministry of Agriculture and Rural Affairs Harbin P. R. China
- Key Laboratory of Control of Quality and Safety for Aquatic Products Ministry of Agriculture and Rural Affairs Beijing P. R. China
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5
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Zhang B, Zhu W, Cao L, Yu Y, Qin D, Huang X, Deng Y. Toward Reduced Interface Contact Resistance: Controllable Surface Energy of Sb 2Te 3 Films via Tuning the Crystallization and Orientation. ACS Appl Mater Interfaces 2022; 14:10955-10965. [PMID: 35168322 DOI: 10.1021/acsami.1c22908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The electrical contact resistance between a metal and semiconductor is one of the keys to improving the output performance of thin-film thermoelectric devices. Herein, we reduced the interface contact resistance by controlling the surface energy of a Sb2Te3 semiconductor via tuning of the crystallization and orientation, preparing an intrinsically compact and flat Sb2Te3 film with high surface energy and low roughness, which can give rise to a low average specific contact resistivity (8.2 × 10-6 Ω cm2) with a Ni/Cu metal. The improvement in interface electrical properties is due to the increase in the surface energy and decrease in the surface roughness of the semiconductor surface, which lead to a transformation from three-dimensional island-shaped nucleation to two-dimensional layered nucleation for surface-attached metal films, forming a longitudinally tight connection contact with a low resistance. This approach allows the resistivity to become close to the fundamental theoretically calculated limit. Our work provides a new idea for reducing the contact resistivity of thin-film thermoelectric devices, which is conducive to supporting the development of thermoelectric semiconductor planarization.
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Affiliation(s)
- Bohan Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100083, China
| | - Wei Zhu
- Research Institute for Frontier Science, Beihang University, Beijing 100083, China
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China
| | - Lili Cao
- Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science and Technology University, Beijing 100192, China
| | - Yuedong Yu
- School of Materials Science and Engineering, Beihang University, Beijing 100083, China
| | - Dongli Qin
- School of Materials Science and Engineering, Beihang University, Beijing 100083, China
| | - Xin Huang
- School of Materials Science and Engineering, Beihang University, Beijing 100083, China
| | - Yuan Deng
- Research Institute for Frontier Science, Beihang University, Beijing 100083, China
- Hangzhou Innovation Institute, Beihang University, Hangzhou 310052, China
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6
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Zhao Z, Qin D, Zhao W. Asymptomatic cement leakage into inferior vena cava. QJM 2022; 115:49-50. [PMID: 34791451 DOI: 10.1093/qjmed/hcab285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Indexed: 11/13/2022] Open
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7
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Yin R, Gao L, Qin D, Chen L, Niu N. Preparation of porous carbon-based molecularly imprinted polymers for separation of triazine herbicides in corn. Mikrochim Acta 2021; 189:23. [PMID: 34893943 DOI: 10.1007/s00604-021-05100-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 11/09/2021] [Indexed: 11/24/2022]
Abstract
A synthesis route of using cellulose as the precursor to prepare porous carbon (PC) had been established in this study. The as-prepared PC was introduced as carriers in the synthesis process of porous carbon-molecularly imprinted polymers (PC-MIPs), which greatly improved the absorption capacity of MIPs. Triazine pesticides in corn were extracted with matrix solid-phase dispersion (MSPD) using the PC-MIPs as dispersants and determined by ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Under the optimal MSPD condition for extracting six kinds of triazines (simazine, terbutryn, simetryne, prometryne, ametryn, and atrazine), the detection limits were 0.005-0.02 ng g-1, while the precisions were 1.2-5.9%, and the recoveries were 92.6-104.7%. The method has been extensively applied to analyze various corn samples. Atrazine residue (1.2 μg kg-1) was detected in one corn sample, which was lower than the maximum residual limit indicated by the Chinese stated standards (50 μg kg-1).
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Affiliation(s)
- Ran Yin
- Key Laboratory of Forest Plant Ecology, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.,Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Lei Gao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin, 150040, China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin, 150040, China
| | - Ligang Chen
- Key Laboratory of Forest Plant Ecology, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
| | - Na Niu
- Key Laboratory of Forest Plant Ecology, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China. .,Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
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8
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Gao L, Qin D, Chen Z, Bai S, Du N, Li C, Hao Q, Wang P. Selective magnetic solid-phase extraction of amide herbicides from fish samples coupled with ultra-high-performance liquid chromatography with tandem mass spectrometry. J Sep Sci 2021; 45:896-907. [PMID: 34875128 DOI: 10.1002/jssc.202100823] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/02/2021] [Accepted: 12/05/2021] [Indexed: 02/02/2023]
Abstract
An efficient magnetic dummy template molecularly imprinted polymer nanocomposite was prepared using multi-walled carbon nanotubes as a support and metolachlor deschloro as a dummy template. The obtained nanocomposites were characterized using Fourier transform infrared spectroscopy, vibrating sample magnetometry, scanning electron microscopy, and transmission electron microscopy. The adsorption performance of the obtained nanocomposites was evaluated through binding experiments, including static adsorption, kinetic adsorption, and selective recognition studies. The obtained nanocomposites were successfully applied as selective sorbents for the magnetic solid-phase extraction of seven amide herbicides (alachlor, acetochlor, pretilachlor, butachlor, metolachlor, diethatyl ethyl, and dimethachlor) coupled with liquid chromatography-tandem mass spectrometry from fish samples. Under the optimized conditions, the limit of detection was 0.01-0.1 μg/kg. The obtained recoveries of the amide herbicides from the fish samples were in the range of 88.0 to 102.1% with a relative standard deviation of less than 7.5%. This method, which eliminated the effect of template leakage on qualitative and quantitative analysis was found to be superior to the methods reported in the literature. The results indicated that it could be successfully applied to analyze amide herbicides in fish samples with satisfactory recoveries.
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Affiliation(s)
- Lei Gao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing, P. R. China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing, P. R. China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China
| | - Shuyan Bai
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China
| | - Ningning Du
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China
| | - Chenhui Li
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China
| | - Qirui Hao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Supervision, Inspection and Testing Center for Fishery Environment and Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China.,Laboratory of Quality and Safety Risk Assessment for Aquatic Products (Harbin), Ministry of Agriculture and Rural Affairs, Harbin, P. R. China
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9
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Gao L, Wang P, Chen Z, Tang S, Wu S, Li G, Qin D. Multi-pharmaceuticals analysis in fish by continuous series solid-phase extraction coupled with UPLC-MS/MS. ACTA CHROMATOGR 2021. [DOI: 10.1556/1326.2020.00876] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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
Abstract
Pharmaceuticals which are widely used in aquatic can easily migrate into the environment and aquatic animals, and can increase the risk of drug resistance and allergic symptoms if consumed by humans. In order to achieve high-throughput analysis of pharmaceuticals with different physical and chemical properties from complex matrices, we developed a new method for various types pharmaceuticals in fish and shrimp tissue. Series solid-phase extraction (s-SPE) with different adsorbents was selected for extracting and purifying analytes with different paddings. s-SPE were combined with ultra performance liquid chromatography triple quadruple tandem mass spectrometry (UPLC-MS/MS) for the detection of 30 pharmaceuticals antibiotics in fish samples. This method was stabilized and reliable to determinate the pharmaceuticals in fish and shrimp samples. As the method combined multiple Chinese national standards method, it could be easily treat the multi-pharmaceuticals from the fish and shrimp samples once time. It provided for both quantitative and qualitative methods and they could be applied to single- or multi-residue methods.
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Affiliation(s)
- Lei Gao
- 1 Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin 150070, China
- 2 Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100041, China
| | - Peng Wang
- 1 Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin 150070, China
| | - Zhongxiang Chen
- 1 Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin 150070, China
| | - Shizhan Tang
- 1 Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin 150070, China
| | - Song Wu
- 1 Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin 150070, China
| | - Gang Li
- 3 Jilin Province Fisheries Research Institute, 1195 Kunshan Street, Changchun 130033, China
| | - Dongli Qin
- 1 Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 232 Hesong Street, Harbin 150070, China
- 2 Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100041, China
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Gao L, Qin D, Chen Z, Wu S, Tang S, Wang P. Front Cover: Determination of sulfonamide antibiotics in fish and shrimp samples based on magnetic carbon nanotube dummy molecularly imprinted polymer extraction followed by UPLC‐MS/MS. Electrophoresis 2021. [DOI: 10.1002/elps.202170041] [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: 11/06/2022]
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Gao L, Qin D, Chen Z, Wu S, Tang S, Wang P. Determination of sulfonamide antibiotics in fish and shrimp samples based on magnetic carbon nanotube dummy molecularly imprinted polymer extraction followed by UPLC-MS/MS. Electrophoresis 2020; 42:725-734. [PMID: 33320349 DOI: 10.1002/elps.202000243] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 12/06/2020] [Accepted: 12/09/2020] [Indexed: 11/09/2022]
Abstract
In this study, a novel purification method using magnetic solid-phase extraction (MSPE) based on magnetic carbon nanotube dummy molecularly imprinted polymer (MCNTMIP) nanocomposite was investigated for separation and enrichment of sulfonamide antibiotics (SAs) in fish and shrimp samples. The MCNTMIP nanocomposite was successfully synthesized by applying carbon nanotubes as supporting template, methacrylic acid as functional monomer, sulfabenzamide as the dummy template for SAs, and ethylene glycol dimethacrylate as crosslinking agent, then was characterized by Fourier-transform infrared spectrometry and vibrating sample magnetometry. The adsorption performance of MCNTMIP was evaluated by binding experiments, including static adsorption, kinetic adsorption, and selectivity recognition study. The results confirmed that an imprinted polymer layer was successfully constructed on the surface of the MCNTMIP and this sorbent has advantages of simple magnetic separation, specific molecular recognition, and high adsorption capacity. Combined with ultra-high performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS), we developed a rapid, sensitive, efficient MSPE method for detecting SAs analytes. Under the optimal conditions, the limits of detection were low to 0.1 μg/kg, and the recoveries of SAs analytes were ranged between 90.2 and 99.9%. In addition, the precision values were ranged between 0.5 and 9.1%. This method was successfully applied to analyze SAs in fish and shrimp samples with satisfactory recoveries.
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Affiliation(s)
- Lei Gao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing, P. R. China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China.,Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing, P. R. China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China
| | - Song Wu
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China
| | - Shizhan Tang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, P. R. China
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12
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Abstract
The objectives of this study were to assess the reporting quality and methodological quality of split-mouth trials (SMTs) published during the past 2 decades and to determine whether there has been an improvement in their quality over time. We searched the MEDLINE database via PubMed to identify SMTs published in 1998, 2008, and 2018. For each included SMT, we used the CONsolidated Standards Of Reporting Trials (CONSORT) 2010 guideline, CONSORT for within-person trial (WPT) extension, and a new 3-item checklist to assess its trial reporting quality (TRQ), WPT-specific reporting quality (WRQ), and SMT-specific methodological quality (SMQ), respectively. Multivariable generalized linear models were performed to analyze the quality of SMTs over time, adjusting for potential confounding factors. A total of 119 SMTs were included. The mean overall score for the TRQ (score range, 0 to 32), WRQ (0 to 15), and SMQ (0 to 3) was 15.77 (SD 4.51), 6.06 (2.06), and 1.12 (0.70), respectively. The primary outcome was clearly defined in only 28 SMTs (23.5%), and only 27 (22.7%) presented a replicable sample size calculation. Only 45 SMTs (37.8%) provided the rationale for using a split-mouth design. The correlation between body sites was reported in only 5 studies (4.2%) for sample size calculation and 4 studies (3.4%) for statistical results. Only 2 studies (1.7%) performed an appropriate sample size calculation, and 46 (38.7%) chose appropriate statistical methods, both accounting for the correlation among treatment groups and the clustering/multiplicity of measurements within an individual. Results of regression analyses suggested that the TRQ of SMTs improved significantly with time ( P < 0.001), while there was no evidence of improvement in WRQ or SMQ. Both the reporting quality and methodological quality of SMTs still have much room for improvement. Concerted efforts are needed to improve the execution and reporting of SMTs.
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Affiliation(s)
- D. Qin
- Hubei-MOST KLOS & KLOBM, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - F. Hua
- Center for Evidence-Based Stomatology, School and Hospital of Stomatology, Wuhan University, Wuhan, China
- Cochrane Oral Health, Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - H. He
- Hubei-MOST KLOS & KLOBM, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - S. Liang
- Hubei-MOST KLOS & KLOBM, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - H. Worthington
- Cochrane Oral Health, Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
| | - T. Walsh
- Cochrane Oral Health, Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
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Zhang Y, Chen X, Hou L, Lin X, Qin D, Wang H, Hai S, Cao L, Dong B. Prevalence and Risk Factors Governing the Loss of Muscle Function in Elderly Sarcopenia Patients: A longitudinal Study in China with 4 Years of Follow-Up. J Nutr Health Aging 2020; 24:518-524. [PMID: 32346691 DOI: 10.1007/s12603-020-1361-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [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] [Indexed: 02/08/2023]
Abstract
OBJECTIVES Data regarding the occurrence of risk factors that promote the loss of muscle mass, strength and function in sarcopenia patients in elderly Chinese patients are sparse. Here, we investigated the alterations in muscle mass, function and strength in those with sarcopenia over a 4-year period. We further evaluated the risk factors leading to a loss of grip strength, gait speed and skeletal muscle mass index in sarcopenia patients. DESIGN A face-to-face cross-sectional survey. SETTING AND PARTICIPANTS The study population consisted of 560 Chinese aged over 59 years. MEASUREMENTS Study recordings took places over a four-year period from 2014. Muscle mass was assessed through bioelectrical impedance analysis (BIA) performed on an Inbody720, Biospace. Hand-grip strength and 6 m walking speed were used as measurements of muscle strength and function. Sarcopenia was diagnosed using the Asian Working Group for Sarcopenia criteria (AWGS). RESULTS In total, 474 of the elderly residents completed the follow-up. The rates of decreased ASMI, grip strength, and gait speed in the sarcopenia patients increased over the 4-year period. Following multivariate analysis, age was identified as the main risk factor for all the observed decrease, gender was specifically related to the loss of ASMI, stroke was a risk factor for gait speed and sarcopenia. A high BMI was a risk factor for a low gait speed but was protective for a loss of skeletal muscle mass and sarcopenia. CONCLUSIONS Age leads to a decline in muscle strength and function. In elderly Chinese patients with sarcopenia, the rates of reduced grip strength, gait-speed and sarcopenia increased. A high BMI was protective against the decline in muscle mass and sarcopenia, but represented a risk factor for low gait speed. Stoke was identified to cause a loss of gait speed in sarcopenia patients.
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Affiliation(s)
- Y Zhang
- Professor Birong Dong, Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, GuoXueXiang, Chengdu, Sichuan, China, 610041. E-mail address: , Fax: +86-028-85421550, Tel: +86-028-85421550
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Yue RC, Lu SZ, Luo Y, Zeng J, Liang H, Wang XB, Qin D, Yang XL, Hu HX, Zeng CY. [Effect of NLRP3 mediated pyroptosis in myocardial cells undergoing hypoxia/deoxygenation injury]. Zhonghua Xin Xue Guan Bing Za Zhi 2019; 47:471-478. [PMID: 31262132 DOI: 10.3760/cma.j.issn.0253-3758.2019.06.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effect of NACHT-LRR-PYD- containing proteins 3 (NLRP3) mediated pyroptosis in myocardial cells undergoing hypoxia/deoxygenation (H/R) injury. Methods: In order to observe whether H/R-treatment could cause pyroptosis, H9c2 cells were divided into 2 groups randomly using the lottery method: control group(without H/R-treatment) and H/R group (in which the H9c2 cells were underwent H/R-treatment). In order to clarify the role of pyroptosis in H/R-injury, H9c2 cells were divided into 4 groups randomly using the lottery method: control group(in which the H9c2 cells were cultivated with normal medium); YVAD group(in which the H9c2 cells were pretreated with z-Val-Ala-Asp(Ome)-fluoromethylketone (Z-YVAD-FMK) 20 μm for 4 hours, then replaced with normal medium); H/R group(H9c2 cells underwent H/R-treatment); YVAD+H/R group (in which the H9c2 cells were pretreated with 20 μm Z-YVAD-FMK for 4 hours before H/R-treatment). To determine whether H/R-induced cell pyroptosis is associated with NLRP3, H9c2 cells were divided into 4 groups randomly using the lottery method: control group (in which cells were transfected with a control nonspecific siRNA); si-NLRP3 group (in which cells were transfected with NLRP3-targeting siRNA); H/R group(in which cells were transfected with a control nonspecific siRNA before H/R-treatment); si-NLRP3+H/R group(in which the H9c2 cells were transfected with NLRP3-targeting siRNA before H/R-treatment). Pore formation on cell membrane was detected by propidium iodide (PI) staining. Cell viability was detected by CCK8 reagent. The protein expression of Caspase-1, interleukin-1β (IL-1β) and NLRP3 was detected by Western blot. Results: (1) The positive rate of PI staining ((26.46±5.15)% vs. (1.69±0.73)%,P<0.01), expression of NLRP3 (0.57±0.16 vs. 0.23±0.06,P<0.01), expression of Caspase-1 (1.07±0.13 vs. 0.37±0.08,P<0.01), and expression of IL-1β (0.38±0.08 vs. 0.16±0.05,P<0.01) were significantly higher in H/R group than in control group. (2)The cell vitality was significantly higher in YVAD+H/R group than in H/R group ((87.31±9.05)% vs. (73.30±7.19)%, P<0.05).The positive rate of PI staining was significantly decreased in YVAD+H/R group than in H/R group ((18.12±4.36)% vs. (26.45±4.60)%, P<0.05). The expression of Caspase-1 (0.72±0.12 vs. 1.07±0.15, P<0.05) and IL-1β(0.29±0.07 vs. 0.39±0.06, P<0.05) were significantly lower in YVAD+H/R group than in H/R group. (3) The cell vitality was significantly increased in si-NLRP3+H/R group than in H/R group ((85.46±7.71)% vs. (72.41±5.53)%, P<0.05). The positive rate of PI staining was significantly lower in si-NLRP3+H/R group than in H/R group ((18.22±4.20)% vs. (26.73±3.26)%, P<0.05). The expression of Caspase-1(0.87±0.07 vs. 1.15±0.15, P<0.05) and IL-1β(0.41±0.07 vs. 0.58±0.10, P<0.05) were significantly decreased in si-NLRP3+H/R group than in H/R group. Conclusion: NLRP3 mediated pyroptosis is involved in H/R injury of myocardial cells.
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Affiliation(s)
- R C Yue
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - S Z Lu
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - Y Luo
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - J Zeng
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - H Liang
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - X B Wang
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - D Qin
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - X L Yang
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - H X Hu
- Department of Cardiology, North Sichuan Medical College First Affiliated Hospital, Nanchong 637000, China
| | - C Y Zeng
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing 400042, China
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Chen Y, Bai B, Yan H, Wen F, Qin D, Jander G, Xia Q, Wang G. Systemic disruption of the homeostasis of transfer RNA isopentenyltransferase causes growth and development abnormalities in Bombyx mori. Insect Mol Biol 2019; 28:380-391. [PMID: 30548717 DOI: 10.1111/imb.12561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Isopentenylation at A37 (i6 A37) of some transfer RNAs (tRNAs) plays a vital role in regulating the efficiency and fidelity of protein synthesis. However, whether insects, which are well known for their highly efficient protein synthesis machinery, employ this regulatory mechanism remains uninvestigated. In the current study, a candidate tRNA isopentenyltransferase (IPT) gene with three alternative splicing isoforms (BmIPT1-BmIPT3) was identified in Bombyx mori (silkworm). Only BmIPT1 could complement a yeast mutant lacking tRNA IPT. Phylogenetic analysis showed that silkworm tRNA IPT is conserved in the Lepidoptera. BmIPT was expressed in all B. mori tissues and organs that were investigated, but was expressed at a significantly higher level in silk glands of the fourth instar compared to the first day of the fifth instar. Interestingly, BmIPT was expressed at a significantly higher level in the domesticated silkworm, B. mori, than in wild Bombyx mandarina in multiple tissues and organs. Knock-down of BmIPT by RNA interference caused severe abnormalities in silk spinning and metamorphosis. Constitutive overexpression of BmIPT1 using a cytoplasmic actin 4 promoter in B. mori raised its messenger RNA level more than sixfold compared with nontransgenic insects and led to significant decreases in the body weight and cocoon shell ratio. Together, these results confirm the first functional tRNA IPT in insects and show that a suitable expression level of tRNA IPT is vital for silk spinning, normal growth, and metamorphosis. Thus, i6 A modification at position A37 in tRNA probably plays an important role in B. mori protein synthesis.
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Affiliation(s)
- Y Chen
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - B Bai
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - H Yan
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - F Wen
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - D Qin
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - G Jander
- Boyce Thompson Institute, Ithaca, NY, USA
| | - Q Xia
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
| | - G Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- Chongqing Key Laboratory of Sericultural Science, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing, China
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16
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Gao L, Qin D, Huang X, Wu S, Chen Z, Tang S, Wang P. Determination of pesticides and Pharmaceuticals from Fish Cultivation Water by parallel solid-phase extraction (SPE) and liquid chromatography–quadrupole time-of-flight mass spectrometry (LC-QTOF-MS). ANAL LETT 2019. [DOI: 10.1080/00032719.2018.1509076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Lei Gao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Xiaoli Huang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Song Wu
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Shizhan Tang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
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Zhang C, Qin D, Shen L, Ji P, Wang J. Does audiovisual distraction reduce dental anxiety in children under local anesthesia? A systematic review and meta-analysis. Oral Dis 2018; 25:416-424. [PMID: 29498793 DOI: 10.1111/odi.12849] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 02/11/2018] [Accepted: 02/20/2018] [Indexed: 12/18/2022]
Abstract
OBJECTIVES To perform a systematic review and meta-analysis on the effects of audiovisual distraction on reducing dental anxiety in children during dental treatment under local anesthesia. METHODS The authors identified eligible reports published through August 2017 by searching PubMed, EMBASE, and Cochrane Central Register of Controlled Trials. Clinical trials that reported the effects of audiovisual distraction on children's physiological measures, self-reports, and behavior rating scales during dental treatment met the minimum inclusion requirements. The authors extracted data and performed a meta-analysis of appropriate articles. RESULTS Nine eligible trials were included and qualitatively analyzed; some of these trials were also quantitatively analyzed. Among the physiological measures, heart rate or pulse rate was significantly lower (p = .01) in children subjected to audiovisual distraction during dental treatment under local anesthesia than in those who were not; a significant difference in oxygen saturation was not observed. The majority of the studies using self-reports and behavior rating scales suggested that audiovisual distraction was beneficial in reducing anxiety perception and improving children's cooperation during dental treatment. CONCLUSION The audiovisual distraction approach effectively reduces dental anxiety among children. Therefore, we suggest the use of audiovisual distraction when children need dental treatment under local anesthesia.
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Affiliation(s)
- C Zhang
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - D Qin
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - L Shen
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - P Ji
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - J Wang
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
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Huang X, Hu Q, Gao L, Hao Q, Wang P, Qin D. Adsorption characteristics of metal–organic framework MIL-101(Cr) towards sulfamethoxazole and its persulfate oxidation regeneration. RSC Adv 2018; 8:27623-27630. [PMID: 35542695 PMCID: PMC9083902 DOI: 10.1039/c8ra04789h] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [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: 06/05/2018] [Accepted: 07/10/2018] [Indexed: 11/21/2022] Open
Abstract
A metal–organic framework, MIL-101(Cr), was used to adsorb sulfamethoxazole (SMZ) in water and activated persulfate (PS) oxidation was investigated to regenerate SMZ-saturated MIL-101(Cr). Adsorption and oxidation were combined in this study. MIL-101(Cr) was characterized by SEM, BET, XPS and FT-IR analyses. Effects of various operating parameters on adsorption efficiency were studied. The dosages of persulfate for SMZ desorption and oxidation were investigated. The results showed that the recommended pH was 6–8 for SMZ adsorption and optimum MIL-101(Cr) dosage was 0.1 g L−1. SMZ adsorption by MIL-101(Cr) was a spontaneous process and nearly exothermic. Saturation adsorption capacity was achieved in 180 s and the adsorption followed the pseudo-second-order model. The maximum adsorption amount of MIL-101(Cr) to SMZ was 181.82 mg g−1 (Langmuir). MIL-101(Cr) also showed good adsorption capacities for sulfachloropyridazine (SCP), sulfamonomethoxine (SMM), and sulfadimethoxine (SDM). Persulfate was helpful for SMZ desorption from the surface of saturated MIL-101(Cr) and sufficient persulfate could simultaneously oxidize the SMZ. XPS analysis showed that the structure of MIL-101(Cr) was stable after the persulfate oxidation process. Regenerated MIL-101(Cr) had the same level of adsorption capacity as fresh MIL-101(Cr). An adsorption–oxidation combined process may be set up based on the results. This study provides basic data for the deep treatment of organic micropollutants in urban water bodies. A metal–organic framework, MIL-101(Cr), was used to adsorb sulfamethoxazole (SMZ) in water and activated persulfate (PS) oxidation was investigated to regenerate SMZ-saturated MIL-101(Cr).![]()
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Affiliation(s)
- Xiaoli Huang
- Heilongjiang River Fisheries Research Institute
- Chinese Academy of Fishery Sciences
- Harbin
- China
| | - Qi Hu
- School of Pharmaceutical Engineering
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Lei Gao
- Heilongjiang River Fisheries Research Institute
- Chinese Academy of Fishery Sciences
- Harbin
- China
| | - Qirui Hao
- Heilongjiang River Fisheries Research Institute
- Chinese Academy of Fishery Sciences
- Harbin
- China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute
- Chinese Academy of Fishery Sciences
- Harbin
- China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute
- Chinese Academy of Fishery Sciences
- Harbin
- China
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You X, Gao L, Qin D, Chen L. Preparation of magnetic molecularly imprinted polymers by atom transfer radical polymerization for the rapid extraction of avermectin from fish samples. J Sep Sci 2016; 40:424-430. [DOI: 10.1002/jssc.201600866] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/18/2016] [Accepted: 11/03/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaoxiao You
- Department of Chemistry, College of Science; Northeast Forestry University; Harbin China
| | - Lei Gao
- Heilongjiang River Fisheries Research Institute; Chinese Academy of Fishery Sciences; Harbin China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute; Chinese Academy of Fishery Sciences; Harbin China
| | - Ligang Chen
- Department of Chemistry, College of Science; Northeast Forestry University; Harbin China
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Wang L, Qin D, Zhang K, Huang Q, Liu S, Han MJ, Dong JY. Metabolites from the co-culture of nigranoic acid and Umbelopsis dimorpha SWUKD3.1410, an endophytic fungus from Kadsura angustifolia. Nat Prod Res 2016; 31:1414-1421. [PMID: 27830590 DOI: 10.1080/14786419.2016.1255891] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The ability of the endophytic fungus Umbelopsis dimorpha SWUKD3.1410 to transform the triterpene nigranoic acid (3, 4-secocycloarta-4(28), 24-(Z)-diene-3, 26-dioic acid; 1) was investigated. Co-culture of nigranoic acid with U. dimorpha SWUKD3.1410 yielded six major products, including a new triterpene (2) and 5 known compounds (3-7). Their structures were identified by the extensive 1D, 2D NMR and HR-ESI-MS Data analysis, and by comparison with those reported data. Among them, 2-4 were transformed from nigranoic acid (1), while 5-7 were derived from the culture medium stimulated by the substrate. On the basis of the structures of 2-4, it was proposed that the transformative process probably involved isomerase and hydroxylase, in which the former was rare in fungi. Additionally, all the compounds (1-7) were evaluated for their cytotoxic activity. As a result, compounds 1, 3-5 exhibited weak cytotoxicity against the tested cell lines, while others showed no cytotoxicity.
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Affiliation(s)
- L Wang
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
| | - D Qin
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
| | - K Zhang
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
| | - Q Huang
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
| | - S Liu
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
| | - M J Han
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
| | - J Y Dong
- a Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences , Southwest University , Chongqing , People's Republic of China
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22
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Faulkner SD, Lee M, Qin D, Morrell L, Xoxi E, Sammarco A, Cammarata S, Russo P, Pani L, Barker R. Pricing and reimbursement experiences and insights in the European Union and the United States: Lessons learned to approach adaptive payer pathways. Clin Pharmacol Ther 2016; 100:730-742. [DOI: 10.1002/cpt.508] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 09/10/2016] [Indexed: 12/24/2022]
Affiliation(s)
- SD Faulkner
- Centre for Advancement for Sustainable Medical Innovation (CASMI); University of Oxford; Oxford United Kingdom
| | - M Lee
- Price Waterhouse Cooper's Strategy&; London United Kingdom
| | - D Qin
- Price Waterhouse Cooper's Strategy&; London United Kingdom
| | - L Morrell
- Centre for Advancement for Sustainable Medical Innovation (CASMI); University of Oxford; Oxford United Kingdom
| | - E Xoxi
- Italian Medicines Agency; Rome Italy
| | | | | | - P Russo
- Italian Medicines Agency; Rome Italy
| | - L Pani
- Italian Medicines Agency; Rome Italy
| | - R Barker
- Centre for Advancement for Sustainable Medical Innovation (CASMI); University of Oxford; Oxford United Kingdom
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Jiang H, Qin D, Chen Z, Tang S, Bai S, Mou Z. Heavy Metal Levels in Fish from Heilongjiang River and Potential Health Risk Assessment. Bull Environ Contam Toxicol 2016; 97:536-542. [PMID: 27473127 DOI: 10.1007/s00128-016-1894-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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: 01/04/2016] [Accepted: 07/23/2016] [Indexed: 06/06/2023]
Abstract
Concentrations of Cu, Zn, Cr, As, Cd, Pb and Hg were determined in 153 samples covering 18 fish species collected from Heilongjiang River, China, and the potential health risks to local residents through fish consumption were estimated. Results revealed that all metals were detected with Cd and Pb having considerably lower detection rate. There were 28.6 % of Lethenteron camtschaticum samples exceeding the limit of inorganic As content established by Chinese legislation. Metal bioaccumulation in fish were poorly correlated with fish sizes, and generally tended to increase with trophic levels. The hazard quotient values of all fish species were far below 1 for general population and fishermen. The carcinogenic risk of As in L. camtschaticum for the local fishermen exceeded the acceptable level of 10(-4) rise in cancer rates, but was considered safe given the migratory habits of the fish.
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Affiliation(s)
- Haifeng Jiang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China.
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China
| | - Shizhan Tang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China
| | - Shuyan Bai
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China
| | - Zhenbo Mou
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China
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Jiang H, Qin D, Mou Z, Zhao J, Tang S, Wu S, Gao L. Trace elements in farmed fish (Cyprinus carpio, Ctenopharyngodon idellaandOncorhynchus mykiss) from Beijing: implication from feed. Food Additives & Contaminants: Part B 2016; 9:132-41. [DOI: 10.1080/19393210.2016.1152597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Jiang H, Tang S, Qin D, Chen Z, Wang J, Bai S, Mou Z. Heavy metals in sea cucumber juveniles from coastal areas of Bohai and Yellow seas, north China. Bull Environ Contam Toxicol 2015; 94:577-582. [PMID: 25421712 DOI: 10.1007/s00128-014-1432-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 11/18/2014] [Indexed: 06/04/2023]
Abstract
The study was undertaken to assess the contents of heavy metals (Cu, Zn, Cr, Pb, Cd, As and Hg) in sea cucumber (Apostichopus japonicus) juveniles from coastal areas of Bohai and Yellow seas in northern China. Sea cucumber juveniles were collected from twenty commercial hatcheries distributed in five coastal cities. The mean concentrations obtained for heavy metals in mg/kg were as follows: Cu (0.179), Zn (2.634), Cr (0.108), Pb (0.065), Cd (0.161), As (0.372), Hg (0.034). All the mean concentrations were below the maximum residual limits set by Chinese legislation, but As in 10 % samples exceeded the safety threshold. Significant differences in contents of Cr, Pb and Hg were found among the five investigated areas. Overall, the heavy metal levels in sea cucumber juveniles were relatively low and more attention should be paid to toxic metals Pb, Cd, As and Hg in future routine monitoring program.
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Affiliation(s)
- Haifeng Jiang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, Heilongjiang, China
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Shen JX, Qin D, Wang H, Wu C, Shi FD, Wu J. Roles of nicotinic acetylcholine receptors in stem cell survival/apoptosis, proliferation and differentiation. Curr Mol Med 2014; 13:1455-64. [PMID: 23971734 DOI: 10.2174/15665240113139990074] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Revised: 11/06/2011] [Accepted: 06/10/2013] [Indexed: 11/22/2022]
Abstract
The potential of stem cells in regenerative medicine, developmental biology, and drug discovery has been well documented. For example, stem cells have the extraordinary ability of self-renewal, and also give rise to many specialized cells. It is clear that stem cell technology has revolutionized our understanding of modern biology and medicine and provided new insights into the mechanisms controlling basic cell biology and various diseases. Nicotinic acetylcholine receptors (nAChRs) are prototypical members of the ligand-gated ion channel super family of neurotransmitter receptors that play many critical roles in brain and body function. It has been demonstrated that in addition to mediation of classical excitatory neurotransmission at some loci and modulation of release of neurotransmitters in some cases, nAChRs also play important roles in influencing synaptic architecture and plasticity as well as neuronal survival/death. Recently, emerging lines of evidence have suggested that nAChRs express on stem cells, where they likely mediate crucial effects of cholinergic signaling on stem cell survival/apoptosis, proliferation, differentiation and maturation. In this review, we summarize current development in cholinergic modulations of stem cell survival/apoptosis, proliferation and differentiation in order to evaluate the impact of nAChRs in stem cell biology and pathology.
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Affiliation(s)
- J-X Shen
- Division of Neurology, Director, Neurophysiology Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, 350 West Thomas Road, Phoenix, AZ 85013-4496, USA.
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Feng H, Feng J, Li Z, Feng Q, Zhang Q, Qin D, Chen W, Li Z, Zhang Y. Percutaneous femoroplasty for the treatment of proximal femoral metastases. Eur J Surg Oncol 2014; 40:402-5. [DOI: 10.1016/j.ejso.2013.12.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2013] [Revised: 12/15/2013] [Accepted: 12/16/2013] [Indexed: 11/27/2022] Open
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Zhou L, Xu J, Luan L, Ma J, Gong Y, Qin D, Pan C. Optimization and validation of a method based on derivatization with methylating agent followed by HPLC-DAD for determining dithiocarbamates residues. ACTA CHROMATOGR 2013. [DOI: 10.1556/achrom.25.2013.4.2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Zhu X, Guo Y, Yao S, Yan Q, Xue M, Hao T, Zhou F, Zhu J, Qin D, Lu C. Synergy between Kaposi's sarcoma-associated herpesvirus (KSHV) vIL-6 and HIV-1 Nef protein in promotion of angiogenesis and oncogenesis: role of the AKT signaling pathway. Oncogene 2013; 33:1986-96. [PMID: 23604117 DOI: 10.1038/onc.2013.136] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Revised: 02/04/2013] [Accepted: 02/28/2013] [Indexed: 12/16/2022]
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is the cause of Kaposi's sarcoma (KS), which is the most common AIDS-associated malignancy. KS is characterized by neovascularization and spindle cell proliferation. The interaction between HIV-1 and KSHV has a central role in promoting the aggressive manifestations of KS in AIDS patients; however, the pathogenesis underlying AIDS-related KS (AIDS-KS) remains unknown. Herein, we examined the potential of HIV-1 negative factor (Nef) to impact KSHV viral interleukin-6 (vIL-6)-induced angiogenesis and tumorigenesis. In vitro experiments showed that exogenous Nef penetrated vIL-6-expressing endothelial cells. Both internalized and ectopic expression of Nef in endothelial cells and fibroblasts synergized with vIL-6 to promote vascular tube formation and cell proliferation. Using a chicken chorioallantoic membrane (CAM) model, we demonstrated that Nef synergistically promotes vIL-6-induced angiogenesis and tumorigenesis. Animal experiments further showed that Nef facilitates vIL-6-induced angiogenesis and tumor formation in athymic nu/nu mice. Mechanistic studies indicated that Nef synergizes with vIL-6 to enhance angiogenesis and tumorigenesis by activating the AKT pathway in the CAM model, as well as nude mice. LY294002, a specific inhibitor of phosphatidylinositol-3-kinase (PI3K), significantly impaired the ability of Nef to promote vIL-6-induced tumorigenesis in an allograft model of nude mice. Our data provide first-line evidence that Nef may contribute to the pathogenesis underlying AIDS-KS in synergy with vIL-6. These novel findings also suggest that targeting the PI3K/AKT signal may be a potentially effective therapeutic approach in AIDS-KS patients.
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Affiliation(s)
- X Zhu
- 1] State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, PR China [2] Key Laboratory of Pathogen Biology of Jiangsu Province, Nanjing Medical University, Nanjing, PR China [3] Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China [4] Department of Laboratory Medicine, Jiangsu Province Hospital of Traditional Chinese Medicine, Nanjing, PR China
| | - Y Guo
- Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
| | - S Yao
- Medical School, Quzhou College of Technology, Quzhou, PR China
| | - Q Yan
- Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
| | - M Xue
- Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
| | - T Hao
- Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
| | - F Zhou
- Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
| | - J Zhu
- Cancer Virology Program, University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA
| | - D Qin
- Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
| | - C Lu
- 1] State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, PR China [2] Key Laboratory of Pathogen Biology of Jiangsu Province, Nanjing Medical University, Nanjing, PR China [3] Department of Microbiology and Immunology, Nanjing Medical University, Nanjing, PR China
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Gao X, Chen F, Qin D. Minimally Invasive Endoscopic Surgery for Cerebrospinal Fluid Rhinorrhea. Skull Base Surg 2012. [DOI: 10.1055/s-0032-1314006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Yan P, Qin D, An YK, Li GZ, Xing J, Liu JJ. In situ synthesis and characterization of GaN nanorods through thermal decomposition of pre-grown GaN films. Nanotechnology 2008; 19:025605. [PMID: 21817547 DOI: 10.1088/0957-4484/19/02/025605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Herein we describe a thermal treatment route to synthesize gallium nitride (GaN) nanorods. In this method, GaN nanorods were synthesized by thermal treatment of GaN films at a temperature of 800 °C. The morphology and structure of GaN nanorods were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that GaN nanorods have a hexagonal wurtzite structure with diameters ranging from 30 to 50 nm. Additionally, GaN nanoplates are also founded in the products. The growth process of GaN nanostructures was investigated and a thermal decomposition mechanism was proposed. Our method provides a cost-effective route to fabricate GaN nanorods, which will benefit the fabrication of one-dimensional nanomaterials and device applications.
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Yao S, Tang Q, Cheng L, Zeng Y, Chen X, Qin D, Lv Z, Lu C. Identification of B cell epitopes at the C-terminus of latency-associated nuclear protein of the kaposi's sarcoma-associated herpesvirus. Acta Virol 2007; 51:109-18. [PMID: 17900217] [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: 05/17/2023]
Abstract
The latency-associated nuclear antigen (LANA) of Kaposi's sarcoma-associated herpesvirus (KSHV) plays a key role in the induction of cell transformation, maintenance of viral episome, and modulation of immune response in human. To identify the presence of B cell epitopes within C-terminus of LANA and to characterize the monoclonal antibodies (MAbs) against this protein, we expressed the C-terminal region at aa 794-1000 of LANA (pLANA-C) in Escherichia coli as a fusion protein. KSHV-positive human sera were able to recognize the recombinant LANA-C in the Western blot analysis and ELISA. Mapping of antigenic epitopes of pLANA-C by KSHV-positive human sera revealed two B cell antigenic epitopes located at aa 846-854 and aa 794-822. The MAb 3F11 recognized a region between at aa 840 to 846 of LANA and exhibited a strong and specific binding to both pLANA-C and native viral LANA. These findings showed that pLANA-C and MAb 3F11 could be used for the detection of KSHV antibodies in human sera and for the advanced study of biological functions of LANA.
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MESH Headings
- Animals
- Antibodies, Monoclonal/immunology
- Antibodies, Viral/blood
- Antibodies, Viral/immunology
- Antigens, Viral/chemistry
- Antigens, Viral/genetics
- Antigens, Viral/immunology
- Cell Line
- Epitopes, B-Lymphocyte/chemistry
- Epitopes, B-Lymphocyte/immunology
- Herpesviridae Infections/diagnosis
- Herpesviridae Infections/immunology
- Herpesviridae Infections/virology
- Herpesvirus 8, Human/immunology
- Humans
- Mice
- Nuclear Proteins/chemistry
- Nuclear Proteins/genetics
- Nuclear Proteins/immunology
- Recombinant Proteins/genetics
- Recombinant Proteins/immunology
- Recombinant Proteins/metabolism
- Sarcoma, Kaposi/diagnosis
- Sarcoma, Kaposi/immunology
- Sarcoma, Kaposi/virology
- Virus Latency
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Affiliation(s)
- S Yao
- Key Laboratory of Pathogen Biology of Jiangsu Province, Nanjing Medical University, Nanjing 210029, P. R. China
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Qin D, Zhang Z, Li M. Screening of upper digestive tract cancer with dilute hydrochloric acid and alcohol in a Chinese high-risk population--a follow-up study of 12 years. Eur J Cancer Prev 2002; 11:509-11. [PMID: 12394250 DOI: 10.1097/00008469-200210000-00015] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
This is a 12-year follow-up study on screening with a mixture of 2% hydrochloric acid and 18% alcohol for upper digestive tract cancer in a Chinese high-risk population. A public screening for upper digestive tract cancer was conducted from November 1979 to May 1984 by giving a mixture of 2% hydrochloric acid and 18% alcohol to 7280 subjects in high-risk population in Yaocun village, Linxian County, Henan province. The subjects were given 15 ml of this mixture in the morning or at noon before lunch when fasting. Five minutes later, irritative reactions (retrosternal discomfort, warmth, pain or pyrosis) was felt in subjects suffering from oesophageal cancer, oesophagitis, gastritis, mucosal dysplasia or ulcer (positive group). Those with normal oesophageal or gastric mucosa felt nothing (negative group). The overall positive rate was 23.2% (1689/7280). In oesophageal or gastric cancer subjects, the positive rate of these symptoms was 88.7%. In subjects with mucosal dysplasia, it was 71.2%. A total of 26 upper digestive tract cancer patients were found. As a result of 12 years' follow-up, 271 persons with upper digestive tract cancer among the 1689 positive group subjects have been discovered, giving an annual morbidity rate of 1.34%. Among the 5591 negative group subjects, 136 persons have been found to suffer from this cancer, giving an annual morbidity rate of 0.2%. This illustrated that the annual morbidity rate of upper digestive tract cancer in the positive group was 6.65 times of that of the negative group ( <0.0001). In conclusion, screening of upper digestive tract cancer with dilute hydrochloric acid in alcohol is simple, safe, non-traumatic, effective and readily acceptable in a high-risk area in China. It may be feasible in other parts of the world, especially the developing countries.
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Affiliation(s)
- D Qin
- Departments of Radiation Oncology and Early Cancer Detection, Cancer Institute (Hospital), Chinese Academy of Medical Sciences, Peking Union Medical College, Pan Jia Yuan, PO Box 2258, Beijing 100021, China.
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Qin D, Yu L. [A limonoid from the Chinese drug dong-feng-jie (Atalantia buxifolia)]. Yao Xue Xue Bao 2002; 33:34-6. [PMID: 11938932] [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: 02/24/2023]
Abstract
A new limonoid was isolated from the ethanol extract of dried roots and stems of Atalantia buxifolia (Poir) Oliv.. Based on chemical properties and spectral analysis, including 1H- and 13CNMR, DEPT, MS, IR and UV spectra, its structure have been identified as: 6-deoxy-6 alpha-acetoxyatalantin acetate. This compound was isolated from this plant for the first time.
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Affiliation(s)
- D Qin
- Guangdong Institute of Materia Medica, Guangzhou 510180
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Wang Z, Fu S, Chen Y, Qin D. Modulation of nitric oxide on lymphokine-activated killer cells in patients with bladder cancer. Chin Med Sci J 2001; 16:213. [PMID: 12903758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Affiliation(s)
- Z Wang
- Institute of Urology, 2nd Affiliated Hospital of Lanzhou Medical College, Lanzhou 730030
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Qin D, Ou G, Mo H, Song Y, Kang G, Hu Y, Gu X. Improved efficacy of chemotherapy for glioblastoma by radiation-induced opening of blood-brain barrier: clinical results. Int J Radiat Oncol Biol Phys 2001; 51:959-62. [PMID: 11704317 DOI: 10.1016/s0360-3016(01)01735-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To improve the efficacy of chemotherapy for glioblastoma through the radiation-induced opening of the blood-brain barrier (BBB). METHODS AND MATERIALS In two previous articles, we have described the results of brain scanning using technetium 99m-labeled somatostatin and the measurement of methotrexate (MTX) concentrations in blood and cerebrospinal fluid (CSF) after i.v. injection. We discovered that the BBB and blood-cerebrospinal fluid barrier opened to a certain extent after 20- to 40-Gy irradiation, thus increasing the degree to which MTX permeated the brain tissue. On the basis of these findings, we retrospectively analyzed the outcome in 56 patients with glioblastoma given either chemotherapy (CCNU) after 20- to 40-Gy irradiation (28 patients) or radiation therapy alone (28 patients). RESULTS The 1-, 3-, and 5-year survival rates were 57.14%, 22.50%, and 15.00% in the combined-therapy group and 17.86%, 7.14%, and 3.57% in the radiotherapy alone group, respectively. The respective median survival times were 29.11 +/- 6.99 and 9.86 +/- 3.45 months (p < 0.001), which represented a statistically significant difference. CONCLUSION Our study further confirms that opening of the BBB induced by irradiation with 20-40 Gy may optimize the effects of intracranial chemotherapy.
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Affiliation(s)
- D Qin
- Department of Radiation Oncology, Cancer Hospital, Chinese Academy of Medical Sciences, Beijing, China.
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Abstract
OBJECTIVE The hypothesis being tested in the present study is that increased anisotropic properties occurs in the remodeled post-infarction heart due to spatial alterations in Kv channels expression and K(+) currents of the remodeled myocardium. METHODS Three to 4 weeks post myocardial infarction (MI) in the rat, we measured the two components of the outward K(+) current, I(to-fast (f)) and I(to-slow(s)) in the epicardium (epi) and endocardium (endo) of noninfarcted remodeled left ventricle (LV) using patch clamp techniques. Alterations in mRNA and/or protein levels of potassium channel genes Kv1.4, Kv1.5, Kv2.1, Kv4.2 and Kv4.3 were measured in epi, midmyocardium (mid), and endo regions of LV and in the right ventricle (RV). RESULTS In sham operated rat heart, the density of I(to-f) was 2.3 times greater in epi compared to endo myocytes. In post-MI heart, the density of I(to-f) and I(to-s) decreased to a similar degree in LV epi and endo but the difference in I(to-f) density between epi and endo persisted. The mRNA and/or protein levels of Kv1.4, Kv2.1, Kv4.2 and Kv4.3 but not Kv1.5 decreased to a varying extent in different regions of LV but not in RV of post-MI heart. CONCLUSIONS Our results suggest that regional downregulation of Kv channels expression and density of K(+) currents can be a significant determinant of increased spatial electrophysiological heterogeneity and contribute to increased electrical instability of the post-MI heart.
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Affiliation(s)
- B Huang
- Cardiology Division, Department of Medicine, Box 1199, State University of New York Health Science Center and Veterans Affairs Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA
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Zhou Z, Wang K, Yang X, Huang S, Zhou L, Qin D, Du L. Synchronization of separation and determination based on multichannel mode-filtered light detection with capillary electrophoresis. Analyst 2001; 126:1838-40. [PMID: 11763052 DOI: 10.1039/b108101m] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel method for the synchronization of separation and determination is described, in which a mode-filtered light detector is used as an online detector in capillary electrophoresis. An instrument is described which has been developed for this purpose. The round capillary used in conventional capillary electrophoresis is replaced by an annular column, which is constructed from a naked optical fibre inserted into a fused-silica capillary. In fact, the annular electrophoresis column itself forms part of the mode-filtered light sensor. Along the side of the annular column are several detection channels for gathering and transmitting the mode-filtered light to a charge-coupled device (CCD). Every channel provides information on the sample from the point at which it is located. Using capillary isotachophoresis incorporating the annular column, the analytes in a sample containing alanine (10.0 mM) and glycine (9.7 mM) were simultaneously separated and determined using multichannel mode-filtered light detection with a detection limit of 1.5 mM.
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Affiliation(s)
- Z Zhou
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China
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Fischer BS, Qin D, Kim K, McDonald TV. Capsaicin inhibits Jurkat T-cell activation by blocking calcium entry current I(CRAC). J Pharmacol Exp Ther 2001; 299:238-46. [PMID: 11561085] [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: 02/21/2023] Open
Abstract
Capacitative calcium entry (CCE) through stores-operated Ca2+ channels is an absolute requirement for normal activation of T lymphocytes. Organic blockers/inhibitors of the channel(s) that carry the inward Ca2+ current (I(CRAC)) responsible for CCE are few. Here we show that capsaicin, the pungent ingredient of hot chili pepper, blocks receptor-stimulated Ca2+ entry in Jurkat T cells. Indo-1 measurements of intracellular calcium show that capsaicin blocks CCE without affecting release of inositol-1,4,5-trisphosphate-sensitive internal Ca2+ stores with an IC50 of 32 microM. Block of Ca2+ entry by capsaicin is identical whether CCE is evoked by T-cell receptor (TCR) stimulation, heterologous muscarinic M1 receptor stimulation, or via thapsigargin depletion of internal Ca2+ stores. Patch-clamp experiments show that capsaicin rapidly and reversibly blocks I(CRAC) with an identical dose response as seen with indo-1 measurements. The major voltage-gated K+ channel in Jurkat cells, Kv1.3, is also blocked by capsaicin. Although Kv1.3 block may contribute to reducing CCE by changes in membrane potential, block of I(CRAC) is the primary mechanism by which capsaicin reduces CCE. Capsaicin analogs capsazepine and resiniferatoxin also produce inhibition of CCE via block of I(CRAC). Upon application of capsaicin to Jurkat cells in culture we observed an inhibition of interleukin-2 (IL-2) production in response to TCR stimulation. The dose dependence of capsaicin's reduction of IL-2 was comparable with its block of I(CRAC), thereby illustrating the functional relevance of capsaicin's block of lymphocyte CCE. Thus, capsaicin and its numerous analogs may have potential use as immunomodulatory drugs and should be further investigated in models of inflammation and T-cell activation.
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Affiliation(s)
- B S Fischer
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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Deng L, Huang B, Qin D, Ganguly K, El-Sherif N. Calcineurin inhibition ameliorates structural, contractile, and electrophysiologic consequences of postinfarction remodeling. J Cardiovasc Electrophysiol 2001; 12:1055-61. [PMID: 11573696 DOI: 10.1046/j.1540-8167.2001.01055.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION After myocardial infarction (MI), the heart undergoes an adaptive remodeling process characterized by hypertrophy of the noninfarcted myocardium. Calcineurin, a Ca2+-calmodulin-regulated phosphatase, has been shown to participate in hypertrophic signal transduction. METHODS AND RESULTS We investigated the effects of calcineurin inhibition by cyclosporin A on key structural, contractile, and electrophysiologic alterations of post-MI remodeling. Male Sprague-Dawley rats were divided into four groups: (1) sham-operated; (2) sham + cyclosporin A; (3) post-MI (left anterior descending coronary artery ligation); and (4) MI + cyclosporin A. Cyclosporin A (25 mg/kg/day) was initiated 2 days before surgery and continued for 30 days. Hypertrophy was evaluated by echocardiography and by changes in membrane capacitance of isolated myocytes from noninfarcted left ventricle (LV). The effects of cyclosporin A on hemodynamics and cardiac dimensions were investigated, and changes in diastolic function were correlated with changes in protein phosphatase 1 activity and the basal level of phosphorylated phospholamban. The effects of cyclosporin A on Kv4.2/Kv4.3 genes expression and transient outward K+ current (I(to)) density also were evaluated. One of 12 rats in the post-MI group and 2 of 12 rats in the post-MI + cyclosporin A group died within 48 hours after MI. There were no late deaths in either MI group. There was no evidence of heart failure (lung congestion and/or pleural effusion) in the two groups 4 weeks post-MI. Calcineurin phosphatase activity increased 1.9-fold in post-MI remodeled LV myocardium, and cyclosporin A administration resulted in an 86% decrease in activity. There were statistically significant decreases of LV end-diastolic pressure, LV end-diastolic diameter, and LV relative wall thickness in the post-MI + cyclosporin A group compared with the post-MI group. On the other hand, there was no significant difference in LV end-systolic diameter or peak rate of LV pressure increase between the two post-MI groups. Protein phosphatase 1 activity was elevated by 36% in the post-MI group compared with sham, and this correlated with a 79% decrease in basal level of p16-phospholamban. In the post-MI + cyclosporin A group, the increase in protein phosphatase 1 activity was much less (18% vs 36%; P < 0.05), and the decrease in basal level of p16-phospholamban was markedly ameliorated (20% vs 79%; P < 0.01). The decreases in mRNA levels of Kv4.2 and Kv4.3 and I(to) density in the LV of the post-MI + cyclosporin A group were significantly less compared with the post-MI group. CONCLUSION Our results show that calcineurin inhibition by cyclosporin A partially ameliorated post-MI remodeled hypertrophy, diastolic dysfunction, decrease in basal level of phosphorylated phospholamban, down-regulation of key K+ genes expression, and decrease of K+ current, with no adverse effects on systolic function or mortality in the first 4 weeks after MI.
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Affiliation(s)
- L Deng
- Department of Medicine, State University of New York Health Science Center, Brooklyn 11203, USA
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Abstract
Follicular dendritic cells (FDCs) are potent accessory cells for B cells, but the molecular basis of their activity is not understood. Several important molecules involved in FDC-B-cell interactions are indicated by blocking the ligands and receptors on FDCs and/or B cells. The engagement of CD21 in the B-cell coreceptor complex by complement-derived CD21 ligand on FDCs delivers a crucial signal that dramatically augments the stimulation delivered by the binding of antigen to the B-cell receptor (BCR). The engagement of Fc gamma receptor IIB (FcgammaRIIB) by the Ig crystallizable fragment (Fc) in antigen-antibody complexes held on FDCs decreases the activation of immunoreceptor tyrosine-based inhibition motifs (ITIMs), mediated by the crosslinking of BCR and FcgammaRIIB. Thus, FDCs minimize a negative B-cell signal. In short, these ligand-receptor interactions help to signal to B cells and meet a requirement for B-cell stimulation that goes beyond the necessity of T-cell help.
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Affiliation(s)
- J G Tew
- Dept of Microbiology and Immunology, Medical College of Virginia, Virginia Commonwealth University, PO Box 980678, Richmond, VA 23298-0678, USA.
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Cui J, Kagan A, Qin D, Mathew J, Melman YF, McDonald TV. Analysis of the cyclic nucleotide binding domain of the HERG potassium channel and interactions with KCNE2. J Biol Chem 2001; 276:17244-51. [PMID: 11278781 DOI: 10.1074/jbc.m010904200] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mutations in the cyclic nucleotide binding domain (CNBD) of the human ether-a-go-go-related gene (HERG) K+ channel are associated with LQT2, a form of hereditary Long QT syndrome (LQTS). Elevation of cAMP can modulate HERG K+ channels both by direct binding and indirect regulation through protein kinase A. To assess the physiological significance of cAMP binding to HERG, we introduced mutations to disrupt the cyclic nucleotide binding domain. Eight mutants including two naturally occurring LQT2 mutants V822M and R823W were constructed. Relative cAMP binding capacity was reduced or absent in CNBD mutants. Mutant homotetramers carry little or no K+ current despite normal protein abundance and surface expression. Co-expression of mutant and wild-type HERG resulted in currents with altered voltage dependence but without dominant current suppression. The data from co-expression of V822M and wild-type HERG best fit a model where one normal subunit within a tetramer allows nearly normal current expression. The presence of KCNE2, an accessory protein that associates with HERG, however, conferred a partially dominant current suppression by CNBD mutants. Thus KCNE2 plays a pivotal role in determining the phenotypic severity of some forms of LQT2, which suggests that the CNBD of HERG may be involved in its interaction with KCNE2.
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Affiliation(s)
- J Cui
- Section of Molecular Cardiology, Departments of Medicine and Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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Qin D, Huang B, Deng L, El-Adawi H, Ganguly K, Sowers JR, El-Sherif N. Downregulation of K(+) channel genes expression in type I diabetic cardiomyopathy. Biochem Biophys Res Commun 2001; 283:549-53. [PMID: 11341759 DOI: 10.1006/bbrc.2001.4825] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Type I diabetic cardiomyopathy has consistently been shown to be associated with decrease of repolarising K(+) currents, but the mechanisms responsible for the decrease are not well defined. We investigated the streptozotocin (STZ) rat model of type I diabetes. We utilized RNase protection assay and Western blot analysis to investigate the message expression and protein density of key cardiac K(+) channel genes in the diabetic rat left ventricular (LV) myocytes. Our results show that message and protein density of Kv2.1, Kv4.2, and Kv4.3 are significantly decreased as early as 14 days following induction of type I diabetes in the rat. The results demonstrate, for the first time, that insulin-deficient type I diabetes is associated with early downregulation of the expression of key cardiac K(+) channel genes that could account for the depression of cardiac K(+) currents, I(to-f) and I(to-s). These represent the main electrophysiological abnormality in diabetic cardiomyopathy and is known to enhance the arrhythmogenecity of the diabetic heart. The findings also extend the extensive list of gene expression regulation by insulin.
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Affiliation(s)
- D Qin
- Department of Veterans Affairs, New York Harbor Healthcare System, Brooklyn Campus, Brooklyn, New York, 11209, USA
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Kang S, Qin D, Yao T, Ren J. [Elevation distribution of precipitation chemistry in middle/upper troposphere in summer, the northern slope of central Himalayas]. Huan Jing Ke Xue 2001; 22:118-22. [PMID: 11432057] [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: 02/20/2023]
Abstract
During 1997 summer, fresh snow samples were collected from four snowfall events from the elevation of 5800 to 7000 m in the Dasuopu Glacier region on the northern slope of Mt. Xixabangma (28 degrees 33'N, 85 degrees 44'E), in order to understand the elevation distribution of the middle/upper tropospheric components in the remote region. The correlation between SO4(2-), NO3-, Ca2+ and Mg2+ in precipitation differs with type of air mass, indicating the dominant sources of ions vary in short-term (e.g. several days) during summer low dust period. In general, with elevation increases, the concentrations of NO3-, Ca2+ and Mg2+ decreases, while SO4(2-) increases, which are influenced by the variation of dominant sources of ions.
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Affiliation(s)
- S Kang
- Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environment and Engineering Research Institute, CAS, Lanzhou 730000, China.
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Qin D, Mo H, Ou G. [Therapeutic effect on glioblastoma of chemotherapy on the basis of brain irradiation]. Zhonghua Zhong Liu Za Zhi 2001; 23:168-9. [PMID: 11783028] [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 efficacy of chemotherapy for glioblastoma on the basis of brain irradiation. METHODS It was previously reported that the permeability of the blood brain barrier (BBB) to methotrexate could be increased by brain irradiation. In this study, glioblastoma patients were divided into 2 groups, 28 patients in each group. On group of patients was treated with CCNU or BCNU after having given 20-40 Gy irradiation to the brain. The other group of patients received radiation treatment alone. RESULTS The 1-, 3-, and 5-year survival rate of the two groups of patients was 57.1%, 22.5%, 15.0% and 17.9%, 7.1%, 3.6%, respectively. The median survival time was 29.7 +/- 7.0 and 9.7 +/- 3.5 months, respectively (P < 0.001). CONCLUSION Increase in permeability of the BBB after 20-40 Gy brain irradiation may provide an optimal chance for intracranial chemotherapy of glioblastoma.
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Affiliation(s)
- D Qin
- Cancer Institute (Hospital), Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100021, China
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Zhang D, Qin D, Ren J, Kang S, Wang X, Huang C. [Chemical characteristics of fresh snow in Mount Everest Region]. Huan Jing Ke Xue 2001; 22:123-5. [PMID: 11432059] [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: 02/20/2023]
Abstract
The chemistry of fresh snow samples collected in August and September, 1998 from Mount Everest was studied and compared with other fresh snow samples collected in different seasons in this region. The results indicated that major species in precipitation were very low in late summer in Mount Everest region and may be representative of the background of precipitation chemistry of remote regions in the wold. Chemical Characteristics of fresh snow in different seasons had distinct differences and they may reflect different moist source and climatic status. The precipitation in August and September was mainly come from Indian summer monsoon and in April and May it was influenced deeply by the dust of semi-arid and arid regions in central Asia. This indicates the precipitation in this region is climatic sensitively.
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Affiliation(s)
- D Zhang
- Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Huang B, El-Sherif T, Gidh-Jain M, Qin D, El-Sherif N. Alterations of sodium channel kinetics and gene expression in the postinfarction remodeled myocardium. J Cardiovasc Electrophysiol 2001; 12:218-25. [PMID: 11232622 DOI: 10.1046/j.1540-8167.2001.00218.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION After a myocardial infarction (MI), the heart undergoes a remodeling process that includes hypertrophy of noninfarcted left ventricular myocytes. Alterations in the genetic expression, including reexpression of fetal isogene patterns, can result in electrophysiologic changes that contribute to the arrhythmogenicity of post-MI heart. The present study investigated possible alterations in gene expression of Na+ channel subtypes, as well as the kinetics of the Na+ current (I(Na)), in 3- to 4-week-old post-MI rat remodeled left ventricular myocardium. METHODS AND RESULTS Using a macropatch technique, we showed increased Na+ channel bursting activity during sustained depolarization in post-MI remodeled myocytes resulting in a large slow component of the I(Na) decay. A tetrodotoxin-sensitive current contributed 18% to the prolonged APD90 of isolated post-MI myocytes compared with 6% in control myocytes. Our molecular studies revealed that, in addition to the rat heart I (rH I) subtype, thought to be the predominant subtype that encodes a tetrodotoxin-resistant isoform, the brain subtypes NaCh I and NaCh Ia also are expressed in the rat myocytes. Post-MI remodeled myocardium showed increased expression of NaCh I protein with reversion of the NaCh Ia/NaCh I isoform ratio toward the fetal phenotype. CONCLUSION Our findings raise the possibility that the increase in the slow component of I(Na) in post-MI remodeled myocytes is secondary to the increased expression of NaCh I. Additional studies are required to address these questions and to characterize the functional role of the NaCh I subtypes in cardiac myocytes.
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Affiliation(s)
- B Huang
- Department of Medicine, SUNY Health Science Center, Brooklyn, New York 11203, USA
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