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Gu GY, Chen M, Pan JC, Xiong XL. Risk of multi-drug-resistant organism acquisition from prior bed occupants in the intensive care unit: a meta-analysis. J Hosp Infect 2023; 139:44-55. [PMID: 37406860 DOI: 10.1016/j.jhin.2023.06.020] [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: 02/25/2023] [Revised: 06/17/2023] [Accepted: 06/20/2023] [Indexed: 07/07/2023]
Abstract
Multi-drug-resistant organisms (MDROs) have become a global threat to human health. Prior bed occupancy with MDRO infection/colonization is an exposure factor that is closely associated with the MDRO acquisition rates in subsequent bed patients in intensive care units (ICUs). A meta-analysis was conducted to investigate the risk of MDRO acquisition from prior bed occupants in the ICU. PubMed, Cochrane Library, Web of Science, and Embase databases and reference lists were searched for articles published up to December 2021. The Newcastle-Ottawa scale was used for quality assessment. The risk measure was calculated as the odds ratio (OR) and corresponding 95% confidence interval (CI), and the heterogeneity was tested using I2 method and Q test. Eight articles were analysed using a random-effects model. Of the 8147 patients exposed to prior bed occupants infected or colonized with MDROs, 421 had acquired MDROs. The control group consisted of 55,933 patients without exposure factors, of which 1768 had been infected/colonized with MDROs. The pooled acquisition OR for MDROs was 1.80 (95% CI: 1.42, 2.29), P<0.00001. Subgroup analysis based on multi-drug-resistant Gram-positive and Gram-negative organisms was conducted using a fixed-effects model. The results significantly varied between the groups. Heterogeneity was partially explained by the MDRO type. In conclusion, exposure of bed occupants to infected/colonized MDROs significantly increased the risk of MDRO acquisition in subsequent bed occupants.
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Affiliation(s)
- G Y Gu
- Neurosurgical Intensive Care Unit, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - M Chen
- Rehabilitation Medicine Department, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - J C Pan
- Neurosurgical Intensive Care Unit, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - X L Xiong
- The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.
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2
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Zheng ZB, Yu H, Zheng W, Chen Q, Lou XQ, Liu XD, Wang HQ, Pan JC. [Drug resistance and genomic characteristics of Salmonella enterica serovar London from clinical and food sources in Hangzhou City from 2017 to 2021]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:508-515. [PMID: 37032160 DOI: 10.3760/cma.j.cn112150-20220622-00645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
Abstract
Objective: To analyze the drug resistance and genomic characteristics of Salmonella enterica serovar London isolated from clinical and food sources in Hangzhou City from 2017 to 2021. Methods: A total of 91 Salmonella enterica serovar London strains isolated from Hangzhou City from 2017 to 2021 were analyzed for drug susceptibility, pulsed field gel electrophoresis (PFGE) typing and whole genome sequencing. Multilocus sequence typing (MLST), core genome multilocus sequence typing (cgMLST) and detection of drug resistance genes were performed by using the sequencing data. Phylogenetic analysis was conducted to compare the 91 genomes from Hangzhou City with 347 genomes from public databases. Results: No significant difference in the drug resistance rate was observed between clinical strains and food strains to 18 drugs in Hangzhou City(all P>0.05), and the multidrug resistance (MDR) rate was 75.8% (69/91). Most strains were resistant to 7 drug classes simultaneously. One strain was resistant to Polymyxin E as well as positive for mcr-1.1, and 50.5% (46/91) of the strains were resistant to Azithromycin and were positive for mph(A). All 91 Salmonella enterica serovar London strains were ST155, which were subdivided into 44 molecular types by PFGE and 82 types by cgMLST. Phylogenetic analysis showed that most strains from Hangzhou City (83/91) were clustered together, and a small number of human isolates from Europe, North America and pork isolates from Hubei and Shenzhen were mixed in the cluster. Other strains from Hangzhou City (8/91) were closely related to strains from Europe, America and Southeast Asia. Strains isolated from pork were the most closely related to clinical strains. Conclusion: The epidemic of Salmonella enterica serovar London in Hangzhou City is mainly caused by the spread of ST155 strains, which is mainly transmitted locally. At the same time, cross-region transmission to Europe, North America, Southeast Asia, and other provinces and cities in China may also occur. There is no significant difference in the drug resistance rate between clinical strains and food strains, and a high level of MDR is found in the strains. Clinical infection of Salmonella enterica serovar London may be closely related to pork consumption in Hangzhou City.
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Affiliation(s)
- Z B Zheng
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - H Yu
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - W Zheng
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - Q Chen
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - X Q Lou
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - X D Liu
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - H Q Wang
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
| | - J C Pan
- Health Inspection Center, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
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3
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Chen YJ, Zhou XH, Han B, Yu Z, Yi HX, Jiang SL, Li YY, Pan JC, Zhang LW. Regioisomeric and enantiomeric analysis of primary triglycerides in human milk by silver ion and chiral HPLC atmospheric pressure chemical ionization-MS. J Dairy Sci 2020; 103:7761-7774. [PMID: 32622592 DOI: 10.3168/jds.2019-17353] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 07/30/2019] [Accepted: 04/17/2020] [Indexed: 12/19/2022]
Abstract
Triglycerides (TG) not only provide energy for infants but have important physiological functions. Understanding the composition and structure of TG in human milk is conducive to the development of infant formulas. In this study, TG species in human milk from 3 provincial capitals (Zhengzhou, Wuhan, and Harbin) in different regions of China were determined through C18 HPLC electrospray ionization tandem mass spectrometry (MS). The results showed that in human milk from these 3 regions, oleoyl-palmitoyl-linoleoylglycerol (OPL; 16.55, 19.20, and 18.67%, respectively) was more abundant than oleoyl-palmitoyl-oleoylglycerol (OPO; 10.08, 10.22, and 12.03%, respectively). Subsequently, regioisomeric and enantiomeric analysis of main TG in the human milk were performed on silver ion and chiral HPLC atmospheric pressure chemical ionization mass spectrometry (APCI)-MS, respectively. The results showed that rac-OPL (above 85%), rac-OPO (above 85%), rac-palmitoyl-oleoyl-oleoylglycerol (PPO; above 90%), and rac-OLaO (above 70%) were the main regioisomers of OPL, OPO, PPO, and lauroyl-oleoyl-oleoylglycerol (LaOO), respectively. The relative ratios of enantiomer pairs of rac-OPL (rac-OPL1 and rac-OPL2) were about 37 and 63%, respectively.
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Affiliation(s)
- Y J Chen
- College of Food Science and Engineering, Ocean University of China, Qingdao, China 266003
| | - X H Zhou
- Qingdao Central Hospital, Qingdao 266042, China
| | - B Han
- Key Laboratory for Marine Bioactive Substances and Modern Analytical Technology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
| | - Zhuang Yu
- Health Management Center, the Affiliated Hospital of Qingdao University, Qingdao, China 266000
| | - H X Yi
- College of Food Science and Engineering, Ocean University of China, Qingdao, China 266003
| | - S L Jiang
- Heilongjiang Feihe Dairy Co. Ltd., Beijing 100015, China
| | - Y Y Li
- Heilongjiang Feihe Dairy Co. Ltd., Beijing 100015, China
| | - J C Pan
- Heilongjiang Feihe Dairy Co. Ltd., Beijing 100015, China
| | - L W Zhang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China 266003.
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4
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Yu H, Wang XC, Li J, Qian X, Yu XF, Sun Z, Chen JF, Kao QJ, Wang HQ, Pan JC. [Genomic analysis of a 2019-novel coronavirus (2019-nCoV) strain in the first COVID-19 patient found in Hangzhou]. Zhonghua Yu Fang Yi Xue Za Zhi 2020; 54:486-490. [PMID: 32171191 DOI: 10.3760/cma.j.cn112150-20200217-00128] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To understand the viral genomic characteristics of a 2019-novel coronavirus (2019-nCoV) strain in the first COVID-19 patient found in Hangzhou, China. Methods: Viral RNA was extracted in throat swab and sputum sample of the patient and was performed real-time reverse transcription PCR detection and obtained viral genome by high-throughput sequencing method. Phylogenetic analysis was conducted using 29 2019-nCoV genomes and 30 β-coronavirus genomes deposited in NCBI GenBank. Fifteen genomes from Wuhan were grouped by mutation sites and others were identified by Wuhan's or specific mutation sites. Results: A 29 833 bp length genome of the first 2019-nCoV strain in Hangzhou was obtained, covering full length of the coding regions of coronavirus. Phylogenetic analysis showed that the genome was closest to the genome of a bat SARS-like coronavirus strain RaTG13 with an identity of 96.11% (28 666/29 826). Among the genes between two genomes, E genes were highly conserved (99.56%), while S genes had lowest identity (92.87%). The genome sequence similarities among 29 strains from China (Hangzhou, Wuhan, and Shenzhen), Japan, USA, and Finland, were all more than 99.9%; however, some single nucleotide polymorphisms were identified in some strains. Conclusion: The genome of Hangzhou 2019-nCoV strain was very close to the genomes of strains from other cities in China and overseas collected at early epidemic phase. The 2019-nCoV genome sequencing method used in this paper provides an useful tool for monitoring variation of viral genes.
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Affiliation(s)
- H Yu
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - X C Wang
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - J Li
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - X Qian
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - X F Yu
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - Z Sun
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - J F Chen
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - Q J Kao
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - H Q Wang
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
| | - J C Pan
- Hangzhou Center for Disease Prevention and Control, Health Inspection Center, Hangzhou 310021, China
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5
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Li YP, Pan JC, Ma YL. Elucidation of multiple alkane hydroxylase systems in biodegradation of crude oil
n
‐alkane pollution by
Pseudomonas aeruginosa
DN1. J Appl Microbiol 2019; 128:151-160. [DOI: 10.1111/jam.14470] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 09/17/2019] [Accepted: 09/22/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Y. P. Li
- Shaanxi Provincial Key Laboratory of Biotechnology Key Laboratory of Resources Biology and Biotechnology in Western China Ministry of Education College of Life Science Northwest University Xi’an, Shaanxi China
| | - J. C. Pan
- Shaanxi Provincial Key Laboratory of Biotechnology Key Laboratory of Resources Biology and Biotechnology in Western China Ministry of Education College of Life Science Northwest University Xi’an, Shaanxi China
| | - Y. L. Ma
- Shaanxi Provincial Key Laboratory of Biotechnology Key Laboratory of Resources Biology and Biotechnology in Western China Ministry of Education College of Life Science Northwest University Xi’an, Shaanxi China
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Wang HQ, Yu H, Zheng W, Zhang W, Liu T, Lou XQ, Huang CP, Huang LM, Shen LM, Pan JC. [Preliminary application of next generation sequencing technique in pathogen identification of foodborne disease]. Zhonghua Yu Fang Yi Xue Za Zhi 2018; 52:647-652. [PMID: 29886688 DOI: 10.3760/cma.j.issn.0253-9624.2018.06.015] [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 analyze genomic features of pathogens based on next generation sequencing technique in a food-borne disease event. Methods: A total of 11 blood samples, stomach contents before gastric lavage from the death and patients' foods were collected. S. aureus, B. cereus and toxic substances were detected. B. cereus detected in foods were counted. The conserved region of 16 S rDNA gene and ces gene(cereulide) of B. cereus isolates were detected by real-time PCR. Next Generation Sequencing (NGS) technology was applied to acquire genome sequences of isolates. Different plasmids distribution and comparative genomics analysis with reference sequences in public databases were analyzed. Results: Only B. cereus tested positive in all samples. The counts of B. cereus in Egg fried rice, one food samples, were 1.9×10(7) CFU/g, and the counts of B. cereus in dried and fried fish and brine pork head meat samples were 3.0×10(3) CFU/g both. Ten isolates were carrying hlyⅢ, nheA, nheB, inlA and inhA genes, and nine isolates carried the plcR gene and nine isolates carried the nheC gene. The PCR result of 16 S rDNA gene and ces gene of all isolates were positive. All carried the complete ces genes cluster sequence which were identical to the sequence of plasmid pCER270 (NC_01 0924.1) from strain AH187 in United Kingdom and pNCcld (NC_016792.1) from NC7401 in Japan. The alignment of plasmids turned out the sequence of the isolate differed from the pXO1 and pXO2 plasmids of B. anthracis, but carried the pNCcld plasmid containing the ces genes cluster. The phylogenetic tree based on genomic sequences of ten isolates showed high similarity (distances in phylogenetic tree from 2.0×10(-6)-9.0×10(-6)) to each other and to the B. cereus strains AH187 and NC7401 (MLST ST26 type, distances in phylogenetic tree from 3.8×10(-5)-4.5×10(-5)). Conclusion: The foodborne disease event was caused by vomiting type Bacillus cereus without plasmid pXO1 and pXO2 contaminated egg fried rice. The vomiting-type food poisoning caused by B. Cereus globally is probably associated with ST26, ST164 and other strains harboring ces gene.
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Affiliation(s)
- H Q Wang
- Microbiological Laboratory, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
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7
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Pan JC, Booth J, Ross V, Harris L, Pan P. Abstract PR213. Anesth Analg 2016. [DOI: 10.1213/01.ane.0000492611.92153.16] [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: 11/05/2022]
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8
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Jonges M, Meijer A, Fouchier RA, Koch G, Li J, Pan JC, Chen H, Shu YL, Koopmans MP. Guiding outbreak management by the use of influenza A(H7Nx) virus sequence analysis. Euro Surveill 2013; 18:20460. [PMID: 23611030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
The recently identified human infections with avian influenza A(H7N9) viruses in China raise important questions regarding possible source and risk to humans. Sequence comparison with an influenza A(H7N7) outbreak in the Netherlands in 2003 and an A(H7N1) epidemic in Italy in 1999–2000 suggests that widespread circulation of A(H7N9) viruses must have occurred in China. The emergence of human adaptation marker PB2 E627K in human A(H7N9) cases parallels that of the fatal A(H7N7) human case in the Netherlands.
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Affiliation(s)
- M Jonges
- Department of Virology, Centre for Infectious Disease Control, National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands.
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Umino Y, Everhart D, Solessio E, Cusato K, Pan JC, Nguyen TH, Brown ET, Hafler R, Frio BA, Knox BE, Engbretson GA, Haeri M, Cui L, Glenn AS, Charron MJ, Barlow RB. Hypoglycemia leads to age-related loss of vision. Proc Natl Acad Sci U S A 2006; 103:19541-5. [PMID: 17159157 PMCID: PMC1697832 DOI: 10.1073/pnas.0604478104] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The retina is among the most metabolically active tissues in the body, requiring a constant supply of blood glucose to sustain function. We assessed the impact of low blood glucose on the vision of C57BL/6J mice rendered hypoglycemic by a null mutation of the glucagon receptor gene, Gcgr. Metabolic stress from moderate hypoglycemia led to late-onset loss of retinal function in Gcgr(-/-) mice, loss of visual acuity, and eventual death of retinal cells. Retinal function measured by the electroretinogram b-wave threshold declined >100-fold from age 9 to 13 months, whereas decreases in photoreceptor function measured by the ERG a-wave were delayed by 3 months. At 10 months of age Gcgr(-/-) mice began to lose visual acuity and exhibit changes in retinal anatomy, including an increase in cell death that was initially more pronounced in the inner retina. Decreases in retinal function and visual acuity correlated directly with the degree of hypoglycemia. This work demonstrates a metabolic-stress-induced loss of vision in mammals, which has not been described previously. Linkage between low blood glucose and loss of vision in mice may highlight the importance for glycemic control in diabetics and retinal diseases related to metabolic stress as macular degeneration.
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Affiliation(s)
- Y. Umino
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - D. Everhart
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - E. Solessio
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - K. Cusato
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244
| | - J. C. Pan
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - T. H. Nguyen
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - E. T. Brown
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - R. Hafler
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - B. A. Frio
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - B. E. Knox
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - G. A. Engbretson
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244
| | - M. Haeri
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - L. Cui
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461; and
| | - A. S. Glenn
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461; and
| | - M. J. Charron
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461; and
| | - R. B. Barlow
- *Center for Vision Research, Department of Ophthalmology, State University of New York Upstate Medical University, Syracuse, NY 13210
- To whom correspondence should be addressed at:
Center for Vision Research, Department of Ophthalmology, 3258 Weiskotten Hall, 750 East Adams Street, SUNY Upstate Medical University, Syracuse, NY 13210. E-mail:
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10
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Pan JC, Pei YQ, An L, Lai L. [Seizure activity and lesions of neuronal cells by intrahippocampal injection of guanidinosuccinic acid in rats]. Yao Xue Xue Bao 1998; 31:561-7. [PMID: 9772701] [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: 02/09/2023]
Abstract
Intrahippocampal injection(ihci) of guanidinosuccinic acid (GSA) to rats, induced typical generarized clonic seizures and epileptiform discharges in electrohippocampogram (EHG) and electrocorticogram (ECoG), degenerative changes of neuronal cells in the injected side hippocampus. The pyramidal cells in CA1 area were found to be more vulnerable to GSA than the granular cells. Phenobarbital and phenytoin are typical antiepiletics, but in no case did they successfully protect against GSA induced convulsions, epileptiform discharges in the EHG and ECoG and neurolysis. Ketamine, a selective noncompetitive NMDA receptor antagonist, was shown to protect against not only seizures, but also neuronal cell damage induced by GSA. All these results indicate that GSA very like the endogenous excitatory amino acid, glutamic acid, it also has such effects mentioned above. Therefore, the NMDA receptor may mediate both effects of GSA.
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Affiliation(s)
- J C Pan
- Department of Pharmacology, Beijing Medical University
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11
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Pan JC, Pei YQ, An L, Lai L, D'Hooge R, De Deyn PP. Epileptiform activity and hippocampal damage produced by intrahippocampal injection of guanidinosuccinic acid in rat. Neurosci Lett 1996; 209:121-4. [PMID: 8761997 DOI: 10.1016/0304-3940(96)12615-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [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: 02/02/2023]
Abstract
Guanidinosuccinic acid (GSA) is a guanidino compound found in mammalian central nervous system and physiological fluids. Its level has been found to be greatly increased in serum and cerebrospinal fluid of patients with renal failure, and the compound is suggested to play a role in uremic encephalopathy. In this report we examined the behavioral, electrographic and morphological effects of intrahippocampal GSA injection in unanesthetized rats. Intrahippocampal administration of 2 microliters GSA solution (3.5 nM) was followed by behavior observation, and electrohippocampographic and electrocorticographic recording. GSA-injected animals showed partial clonic seizures leading to generalized clonic seizures, and eventually status epilepticus. These were accompanied by epileptiform electrographic discharges. During generalized clonic seizures, the electrohippocampogram showed arythmic bursting spikes. Epileptiform electric activity persisted even after the generalized clonic convulsions had stopped, and lasted until the animals were killed, 5 days following injection. Microscopic examination of brain slices of these rats revealed severe neural damage in CA1 area of hippocampus. Treatment of rats with the non-competitive NMDA receptor antagonist ketamine prevented both partial and generalized clonic seizures, epileptiform electrographic discharges, and GSA-induced hippocampal damage.
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Affiliation(s)
- J C Pan
- Department of Pharmacology, Beijing Medical University, School of Basic Medical Sciences, People's Republic of China
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12
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Hwa RC, Pan JC. Geometrical branching model: A Monte Carlo simulation of multiparticle production. Phys Rev D Part Fields 1992; 45:106-115. [PMID: 10014195 DOI: 10.1103/physrevd.45.106] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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13
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Zhu TJ, Chen XY, Pan JC, Zhang SS. [Antagonism of Zn2+ on nootropic action of piracetam in mice]. Zhongguo Yao Li Xue Bao 1990; 11:100-2. [PMID: 2275380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In mouse step-down test, the memory impairments of acquisition, consolidation and recognition were induced by anisodine, chloramphenical and ethanol, respectively. Piracetam 100 mg/(kg.d) ip for 5 d improved the anisodine-induced impairment of learning. ZnSO4 5 mg/(kg.d) po for 5 d did not improve the 3 impairments. Memory impairments were enhanced by a combined administration of ZnSO4 and piracetam in these 3 models. These results were confirmed by Y-maze method in normal mice.
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Affiliation(s)
- T J Zhu
- Department of Pharmacology, Wenzhou Medical College, China
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14
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Pan JC, Zhang ZD, Yu LP, Wu AJ, Ding M, Jin GZ. [Potentiation of norepinephrine on rat acupuncture analgesia antagonized by an arcuate nucleus lesion or naloxone-blocked on opiate receptors in periaqueductal gray]. Zhongguo Yao Li Xue Bao 1988; 9:118-22. [PMID: 2847488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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15
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Abstract
Human- and rat-liver microsomes convert the lindane metabolite, beta-PCCH (beta-1,3,4,5,6-pentachlorocyclohex-1-ene (3,4,6/5-PCCH] to the metabolites: 1,2,4-TCB (1,2,4-trichlorobenzene), 1,2,3,4-TTCB (1,2,3,4-tetrachlorobenzene), 2,4,5-TCP (2,4,5-trichlorophenol), 3,4,5/6-PCCOL (1,2,4,5,6-pentachlorocyclohex-1-en-3-ol) and beta-PCCH oxide (1,2,3,4,5-pentachloro-7-oxabicyclo[4.1.0]heptane) or (3,4,6/5-PCCH oxide). The identity of the beta-PCCH oxide is confirmed by column chromatography and g.l.c.-mass spectrometry, in comparison to characterized synthetic material. The stability of the beta-PCCH oxide is indicated by its resistance to hydrolysis by microsomal epoxide hydrolase (EC. 3.3.2.3), or various aqueous acid conditions. It shows no mutagenicity using S. typhimurium strain TM677. However, in levels above 0.05 mg/ml it was lethal to the test cells. It is not a substrate for and is only a weak inhibitor of epoxide hydrolase. A stable halogenated hydrocarbon epoxide metabolite is described. Its toxicological role, if any, remains unaccounted for.
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