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Wang LG, Wang YS, Zhu CM, Qin MY, Wei JY, Jiang Y. Deciphering the in situ phonon evolution of potassium sodium niobate under varying temperature and electric fields. Phys Chem Chem Phys 2024; 26:7083-7089. [PMID: 38345644 DOI: 10.1039/d3cp05703h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
The application of in situ Raman spectroscopy under multiple fields is widely recognized as an effective approach for investigating the physical mechanism of phase transitions in ferroelectrics, because it can directly provide the detailed information about the vibration evolution of various phonon modes within lattices, such as bond stretching and rotation. Based on this technique, our work aims to thoroughly probe the dynamics of phase transitions in traditional ferroelectric potassium sodium niobate [(K,Na)NbO3, KNN] under external fields, by analyzing the in situ dependence of wavenumber and intensity of phonon modes under the varying temperature and electric fields. The results indicate that different vibration modes respectively relating to the A-site ions and NbO6 octahedra in KNN exhibit distinct and abrupt distortion behavior during the orthorhombic-tetragonal and tetragonal-cubic transitions. Moreover, a certain degree of distortion can still be observed in the cubic phase above the Curie temperature. With an applied electric field, KNN presents quite different electrostriction in orthorhombic and tetragonal phases. Particularly, more than one kind of phonon mode undergoes non-linear variations under the varying electric fields, accompanied by the mutations at some fixed fields. These findings will be conducive to further understanding the phase transition mechanism in KNN from the perspective of phonon evolution. Simultaneously, it will also give crucial guidance for the design and development of KNN-based ferroelectrics as well as functional devices.
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Affiliation(s)
- L G Wang
- School of Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China.
- School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, People's Republic of China.
| | - Y S Wang
- School of Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China.
| | - C M Zhu
- School of Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China.
- Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China
| | - M Y Qin
- School of Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China.
| | - J Y Wei
- School of Physics and Technology, Guangxi Normal University, Guilin 541004, People's Republic of China.
| | - Y Jiang
- School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, People's Republic of China.
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2
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Zhu C, Feng Q, Ou Z, Zhong H, Tang X. Minimally invasive technique combined with external fixator in the treatment of pediatric flexion-type humeral supracondylar fractures. Sci Rep 2023; 13:22229. [PMID: 38097631 PMCID: PMC10721626 DOI: 10.1038/s41598-023-48158-6] [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: 08/05/2023] [Accepted: 11/22/2023] [Indexed: 12/17/2023] Open
Abstract
Flexion-type pediatric humeral supracondylar fractures are rare, and the reduction technique remains contradictory. A minimally invasive technique using percutaneous leverage reduction combined with an external fixator was described to achieve satisfactory reduction and avoid the open reduction in this study. The operation and clinical results of patients treated with this technique were retrospectively compared with traditional closed reduction. From January 2013 to January 2018, children diagnosed with displaced flexion-type humeral supracondylar fractures were included in this study. Patients were treated with closed reduction (Group A) or minimally invasive reduction technique (Group B). The external fixator fixation was then applied. The demographic information, as well as the clinical and functional results of the operation, were retrospectively reviewed and evaluated. There were twenty-two patients, ten in Group A and twelve in Group B. The mean duration of the operation in Group A was more prolonged than Group B (59 min versus 46 min, p < 0.001). No infection, nonunion, myositis ossificans, neurovascular injury or other complications related to the operation were observed by the time the fractures healed. During an average 36 months follow-up time, almost all children achieved good to excellent results except for one fair in Group A according to the MEPS and the Flynn criteria. This study introduced a safe and efficient minimally invasive technique for displaced flexion-type supracondylar humerus fractures. With the assistance of mosquito forceps, this leverage technique might achieve similar satisfactory clinical outcomes as traditional closed reduction but with a shorter surgical duration.
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Affiliation(s)
- ChengMing Zhu
- Department of Orthopaedic, Liuzhou Workers Hospital/the Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, 545007, China
| | - QiYuan Feng
- Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - ZiXuan Ou
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - HaoBo Zhong
- Department of Orthopaedics, Huizhou First Hospital, Huizhou, 516000, China
| | - Xin Tang
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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Li QC, Huang JB, Xue HM, Yang M, Zhu CM, Li CK, Dong JC, Chen C. [Construction of Nalm6-Cas9 Cell Line for Genome-Wide Translocation Sequencing]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2022; 30:1384-1390. [PMID: 36208239 DOI: 10.19746/j.cnki.issn.1009-2137.2022.05.013] [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] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
OBJECTIVE In order to conduct high-throughput genome-wide translocation sequencing based on CRISPR/Cas9, Nalm6-cas9 monoclonal cell line expressing Cas9 protein was constructed by lentivirus transduction. METHODS Lentiviral vectors LentiCas9-Blast, pSPAX2, and pMD2.G were used to co-transfect HEK293T cells to obtain recombinant lentivirus. After Nalm6 cells were infected with the recombinant lentivirus, the cells were screened by Blasticidin, and multiple monoclonal cell lines expressing Cas9 protein were obtained by limited dilution. Western blot was used to detect the expression level of Cas9 protein in monoclonal cell lines, and cell count analysis was used to detect the proliferation activity of monoclonal cell lines. LentiCRISPRV2GFP-Δcas9, LentiCRISPRV2GFP-Δcas9-AF4, LentiCRISPRV2GFP-Δ cas9-MLL plasmids were constructed, and transfected with pSPAX2 and pMD2.G, respectively. T vector cloning was used to detect the function of Cas9 protein in Nalm6-Cas9 monoclonal cell line infected with virus. RESULTS Western blot showed that Nalm6-Cas9_1-6 monoclonal cell line had high expression of Cas9 protein. Cell count analysis showed that high expression of Cas9 protein in Nalm6-Cas9_1-6 monoclonal cell line did not affect cell proliferation activity. The Nalm6-Cas9_1-6 monoclonal cell line had high cleavage activity, and the editing efficiency of AF4 and MLL genes was more than 90% which was determined by T vector cloning. CONCLUSION Nalm6-Cas9_1-6 monoclonal cell line stably expressing highly active Cas9 protein was obtained, which provided a basis for exploring the translocation of MLL in therapy-related leukemias based on CRISPR/Cas9 genome-wide high-throughput genome-wide translocation sequencing.
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Affiliation(s)
- Qing-Cheng Li
- Department of Pediatrics, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, Guangdong Province, China
| | - Jun-Bing Huang
- Department of Pediatrics, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, Guangdong Province, China
| | - Hong-Man Xue
- Department of Pediatrics, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, Guangdong Province, China
| | - Mo Yang
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, Guangdong Province, China
| | - Cheng-Ming Zhu
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, Guangdong Province, China
| | - Chi-Kwong Li
- Division of Hematology/Oncology/BMT, Department of Paediatrics, The Chinese University of Hong Kong, Hong Kong 999077, China
| | - Jun-Chao Dong
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China
| | - Chun Chen
- Department of Pediatrics, 2Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, Guangdong Province, China,E-mail: chenchun69@ 126.com
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4
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Liu HY, Wang FH, Liang JM, Xiang YY, Liu SH, Zhang SW, Zhu CM, He YL, Zhang CH. Targeting NAD metabolism regulates extracellular adenosine levels to improve the cytotoxicity of CD8+ effector T cells in the tumor microenvironment of gastric cancer. J Cancer Res Clin Oncol 2022:10.1007/s00432-022-04124-9. [PMID: 35776198 DOI: 10.1007/s00432-022-04124-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [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: 05/03/2022] [Accepted: 06/07/2022] [Indexed: 12/25/2022]
Abstract
PURPOSE Nicotinamide adenine dinucleotide (NAD+) is closely related to the pathogenesis of tumors. However, the effect of NAD+ metabolism of gastric cancer (GC) cells on immune cells remains unexplained. We targeted nicotinamide phosphoribosyltransferase (NAMPT), a rate-limiting enzyme in the NAD+ synthesis salvage pathway, to observe its effect in the immune microenvironment. METHODS NAMPT of GC cell lines was inhibited by using the small molecule inhibitor (FK866) and short hairpin RNA (shRNA). CCK-8 test and flow cytometry were performed to detect cell viability and apoptosis. Immunofluorescence was used to observe changes in mitochondrial membrane potential (MMP).The transfected GC cells (AGS) and patient-derived organoids (PDOs) were cocultured with activated PBMCs, followed by flow cytometric analysis (FCA) for cytokines and inhibitory marker. The level of NAD and ATP of GC cells (AGS & MKN45) was tested combined with NMN and CD39 inhibitor. RESULTS Targeting NAD+ by FK866 obviously reduced MMP, which ultimately inhibited proliferation and increased the apoptosis of GC cells. NAMPT silencing reduced intracellular NAD and ATP,further decreased extracellular adenosine. Meawhile, the cytokines of CD8+T cells were significantly increased after cocultured with transfected AGS, and the expression of PD-1 was distinctly decreased. NMN reversed the effect of shNAMPT and enhanced the immunosuppression. Consistent results were obtained by coculturing PBMCs with PDOs. CONCLUSION Restraining the function of NAMPT resulted in the functional improvement of effector CD8+ T cells by decreasing extracellular adenosine levels and inducing apoptosis of GC cells simultaneously. Therefore, this study demonstrates that NAMPT can be an effective target for gastric cancer immunotherapy.
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Affiliation(s)
- Han-Yuan Liu
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Fu-Hui Wang
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Jian-Ming Liang
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Yuan-Yuan Xiang
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Shu-Hao Liu
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Shi-Wei Zhang
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Cheng-Ming Zhu
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Yu-Long He
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China
| | - Chang-Hua Zhang
- Digestive Disease Center, Guangdong Provincial Key Laboratory of Digestive Cancer Research, The Seventh Affiliated Hospital of Sun Yat-Sen University, No. 628 Zhenyuan Road, Shenzhen, 518107, China.
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5
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Li LL, Wu QZ, Chen JJ, Cui YH, Zhu CM, Li BY, Guo Z, Li WW. Mechanical Insights into Thiol-Mediated Synergetic Biotransformation of Cadmium and Selenium in Nematodes. Environ Sci Technol 2021; 55:7531-7540. [PMID: 33974407 DOI: 10.1021/acs.est.1c00686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cadmium ion (Cd2+) is a common environmental pollutant with high biotoxicity. Interestingly, the Cd2+ biotoxicity can be alleviated by the coexisting selenite (SeO32-), which induces the formation of cadmium selenide-rich nanoparticles (CdSe NPs) under the function of thiol-capping peptides. However, the detailed biochemical mechanisms by which Cd and Se are synergistically transformed into CdSe NPs in living organisms remain unclear so far. Here, we shed light on the molecular basis of such biotransformation processes in Caenorhabditis elegans by focusing on the roles of several key thiol-capping peptides. By monitoring the compositional and structural changes of the Cd and Se species and the genetic-level responses of nematodes, we revealed the specific roles of glutathione (GSH) and phytochelatins (PCs) in mediating the CdSe NP formation. With the aid of in vitro bioassembly assay and density functional theory calculations, the detailed Cd-Se interaction pathways were further deciphered: the ingested Cd binds predominantly to GSH and PCs in sequence, then further interacts with selenocysteine to form tetrahedral-structured PC2-Cd2-Sec2 complex, and ultimately grows into CdSe NPs. This work provides molecular-level insights into the Cd-Se interaction in C. elegans and lays a basis for controlling the ecological and health risks of heavy metals in polluted environment.
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Affiliation(s)
- Ling-Li Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
| | - Qi-Zhong Wu
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Jie-Jie Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yin-Hua Cui
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Cheng-Ming Zhu
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Bing-Yan Li
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Zhen Guo
- School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
| | - Wen-Wei Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
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Sun CH, Li BB, Wang B, Zhao J, Zhang XY, Li TT, Li WB, Tang D, Qiu MJ, Wang XC, Zhu CM, Qian ZR. The role of Fusobacterium nucleatum in colorectal cancer: from carcinogenesis to clinical management. Chronic Dis Transl Med 2019; 5:178-187. [PMID: 31891129 PMCID: PMC6926109 DOI: 10.1016/j.cdtm.2019.09.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Indexed: 02/06/2023] Open
Abstract
Colorectal cancer (CRC) is a common malignant tumor that affects people worldwide. Metagenomic analyses have shown an enrichment of Fusobacterium nucleatum (F. nucleatum) in colorectal carcinoma tissue; many studies have indicated that F. nucleatum is closely related to the colorectal carcinogenesis. In this review, we provide the latest information to reveal the related molecular mechanisms. The known virulence factors of F. nucleatum promote adhesion to intestinal epithelial cells via FadA and Fap2. Besides, Fap2 also binds to immune cells causing immunosuppression. Furthermore, F. nucleatum recruits tumor-infiltrating immune cells, thus yielding a pro-inflammatory microenvironment, which promotes colorectal neoplasia progression. F. nucleatum was also found to potentiate CRC development through toll-like receptor 2 (TLR2)/toll-like receptor 4 (TLR4) signaling and microRNA (miRNA)-21 expression. In addition, F. nucleatum increases CRC recurrence along with chemoresistance by mediating a molecular network of miRNA-18a*, miRNA-4802, and autophagy components. Moreover, viable F. nucleatum was detected in mouse xenografts of human primary colorectal adenocarcinomas through successive passages. These findings indicated that an increased number of F. nucleatum in the tissues is a biomarker for the diagnosis and prognosis of CRC, and the underlying molecular mechanism can probably provide a potential intervention treatment strategy for patients with F. nucleatum-associated CRC.
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Affiliation(s)
- Chun-Hui Sun
- Equipe Communication Intercellulaire et Infections Microbiennes, Centre de Recherche Interdisciplinaire en Biologie (CIRB), Collège de France, Paris 75005, France.,Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Bin-Bin Li
- Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China.,School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Bo Wang
- Department of Oncology, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Jing Zhao
- Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Xiao-Ying Zhang
- Health Management Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Ting-Ting Li
- Department of Gastroenterology, The Second Medical Center of Chinese PLA General Hospital, Beijing 100853, China
| | - Wen-Bing Li
- Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100021, China
| | - Di Tang
- Department of General Surgery, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Miao-Juan Qiu
- Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Xin-Cheng Wang
- Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Cheng-Ming Zhu
- Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Zhi-Rong Qian
- Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
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Li BB, Wang B, Zhu CM, Tang D, Pang J, Zhao J, Sun CH, Qiu MJ, Qian ZR. Cyclin-dependent kinase 7 inhibitor THZ1 in cancer therapy. Chronic Dis Transl Med 2019; 5:155-169. [PMID: 31891127 PMCID: PMC6926117 DOI: 10.1016/j.cdtm.2019.08.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Indexed: 12/11/2022] Open
Abstract
Current cancer therapies have encountered adverse response due to poor therapeutic efficiency, severe side effects and acquired resistance to multiple drugs. Thus, there are urgent needs for finding new cancer-targeted pharmacological strategies. In this review, we summarized the current understanding with THZ1, a covalent inhibitor of cyclin-dependent kinase 7 (CDK7), which demonstrated promising anti-tumor activity against different cancer types. By introducing the anti-tumor behaviors and the potential targets for different cancers, this review aims to provide more effective approaches to CDK7 inhibitor-based therapeutic agents and deeper insight into the diverse tumor proliferation mechanisms.
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Affiliation(s)
- Bin-Bin Li
- School of Biological Sciences, Nanyang Technological University, Singapore 639798, Singapore
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Bo Wang
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Cheng-Ming Zhu
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Di Tang
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Jun Pang
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Jing Zhao
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Chun-Hui Sun
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
- Equipe Communication Intercellulaire et Infections Microbiennes, Centre de Recherche Interdisciplinaire en Biologie (CIRB), College de France, Paris 75005, France
| | - Miao-Juan Qiu
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
| | - Zhi-Rong Qian
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518107, China
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Zhu CM, Liu HB, Wu WX, Xu C. [To explore the role of CT scan in the diagnosis of eosinophilic chronic rhinosinusitis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 32:944-948. [PMID: 29921080 DOI: 10.13201/j.issn.1001-1781.2018.12.015] [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] [Received: 03/11/2018] [Indexed: 11/12/2022]
Abstract
Objective:We explored the role of CT scan in the diagnosis of eosinophilic chronic rhinosinusitis (ECRS) in sinus osteitis for a better guidance of clinic and treatment. Method:A total of 127 patients with chronic rhinosinusitis who underwent primary surgery were collected(52 patients were ECRS). Seventy-five patients with NonECRS performed global osteitis scoring scale (GOSS) osteitis score on the patient's preoperative sinus CT. Mamn-Whitney U analysis was used to compare the GOSS osteitis scores between the two groups. A binary logistic regression analysis was performed on the statistically significant indicators to find predictive GOSS osteitis scores. Receiver operating characteristic curve (ROC curve) analysis was performed on meaningful indicators to analyze the relationship among the cutoff values the sensitivity and the specificity to find the best cutoff value. Result:The osteitis evaluation index GOSS osteitis total score,ethmoid osteitis scores(GOSS-E), ethmoid osteitis score compared with the maxillary osteitis score (GOSS-E/M), posterior group ethmoid sinus osteitis score compared with the former group ethmoid sinus osteitis score (GOSS-PE/AE), anterior ethmoid osteitis scores (GOSS-AE), posterior ethmoid osteitis scores (GOSS-PE), sphenoid osteitis scores (GOSS-S), ECRS significantly higher than NonECRS(P<0.05); binary logistic regression analysis and ROC curve analysis were performed. When the cut-off value of the ethmoid osteitis score was >4.5 (area under the curve was 0.690), the corresponding sensitivity and specificity were 62% and 71%, respectively. Conclusion:When the ethmoid sinus CT is used to obtain a ethmoid osteitis score of >4.5,the ECRS can be diagnosed clinically.
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Affiliation(s)
- C M Zhu
- Department of Otolaryngology Head and Neck Surgery, Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - H B Liu
- Department of Otolaryngology Head and Neck Surgery, Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - W X Wu
- Department of Otolaryngology Head and Neck Surgery, Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - C Xu
- Department of Otolaryngology Head and Neck Surgery, Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
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Huang GJ, Luo MS, Zhang JX, Zhu CM, Liu HB. [Double-way endoscopic surgery in a patient with cystic degeneration of maxillary sinus ossifying fibroma: a case report]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 31:641-642. [PMID: 29871334 DOI: 10.13201/j.issn.1001-1781.2017.08.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 11/12/2022]
Abstract
Ossifying fibroma is a rare benign osteogenic neoplasm arising from undifferentiated cells of the periodontal ligament and with a potential to form fibrous tissue, cementum and bone, which is usually in molar area of the mandible, predominantly seen in young girls. And ossifying fibroma poses diagnostic and therapeutic difficulties due to their clinical, radiological and histological variabilities. We report a rare case of an 18 year old girl with cystic degeneration of ossifying fibroma in maxilla which is an uncommon site of occurrence.
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Zhu CM, Liu HB, Wu WX, Huang GJ, Weng HF. [Diagnosis and treatment of eosinophilic rhinosinusitis]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 32:1203-1206. [PMID: 30282160 DOI: 10.13201/j.issn.1001-1781.2018.15.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Indexed: 06/08/2023]
Abstract
Chronic rhinosinusitis (CRS), a chronic inflammation of the nasal sinus mucosa, is based on a simplified classification of a single clinical phenotype (with or without nasal polyps) that does not adequately reflect the heterogeneity of the pathogenesis of chronic rhinosinusitis complexity. Currently, according to the lesion mucosa or polyps eosinophil infiltration,this type of chronic rhinosinusit is known as eosinophilic chronic rhinosinusitis (ECRS). The curative effect of ECRS is poor than non-eosinophilic rhinosinusitis. This article summarizing the diagnosis and treatment of eosinophilic rhinosinusitis status, is to provide help for clinical diagnosis and treatment.
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Huang GJ, Lou MS, Zhang JX, Zhu CM, Liu HB, Liu YH. [Comparioson after laser surgery versus radiotherapy of T1a glottic carcinoma: A Meta-analysis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:534-540. [PMID: 29871304 DOI: 10.13201/j.issn.1001-1781.2017.07.010] [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] [Received: 11/28/2016] [Indexed: 11/12/2022]
Abstract
Objective:To compare larynx preservation rate, local control rate, overall survival rate and disease-specific survival rate after laser surgery and radiotherapy of T1a glottic carcinoma. Method:PubMed, Web of Science, Embase, Cochrane Library,Chinese biomedical literature datebase,CNKI and Wanfang digital journals were searched from the built of the datebases to October 2016 by computer. Literature screening,date extraction and quality assessment were conducted independently by two co-authors,and the meta-analysis was made with Review Manager 5.3. Result:Twelve literatures were included finally, and statistical analysis results showed that radiotherapy was superior to laser surgery in the laynx preservation rate of T1a glottic carcinoma(OR=3.23,95%CI=1.21~8.60,P=0.02) , overall survival rate and specific disease survival rate were not significant different between laser surgery and radiotherapy. Conclusion:Radiotherapy is superior to laser surgery in the laynx preservation rate of T1a glottic carcinoma.
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Affiliation(s)
- G J Huang
- Department of Otolaryngology Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University,Nanchang, 330006, China
| | - M S Lou
- Department of Anesthesia, the Second Affiliated Hospital of Nanchang University
| | - J X Zhang
- Department of Otolaryngology Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University,Nanchang, 330006, China
| | - C M Zhu
- Department of Otolaryngology Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University,Nanchang, 330006, China
| | - H B Liu
- Department of Otolaryngology Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University,Nanchang, 330006, China
| | - Y H Liu
- Department of Otolaryngology Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University,Nanchang, 330006, China
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12
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Huang GJ, Luo MS, Zhang JX, Zhu CM, Liu YH, Liu HB. [The impact of laser treatment for postoperative different vocal functions in early laryngeal cancer: network Meta-analysis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:382-387. [PMID: 29871267 DOI: 10.13201/j.issn.1001-1781.2017.05.013] [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] [Received: 09/26/2016] [Indexed: 11/12/2022]
Abstract
Objective:To evaluate the impact of postoperative vocal different functional characteristics with laser treatment for early laryngeal cancer.Method:Computer searching the major medical-related databases: PubMed, Web of Science and Embase, searching and screening by two staff members at the same time to read the relevant literatures, extraction of data and research related to the purpose from the selected literature. Using Stata 14.0 software analysis the extracted data with Bayesian network Metaanalysis, get the laser surgery of early laryngeal cancer effects of different voice characteristics of vocal cord.Result:A total of nine articles was included finally according through the necessary conditions, statistical analysis results showed that early laryngeal laser surgery can significantly reduce GRABS and VHI assessment score.Conclusion:Laser treatment of early laryngeal cancer could reduce VHI and the GRABS assessment score postoperatively, improve overall postoperative vocal cord function and the quality of life of patients after surgery, but not in the early post-operative function and physiology in vocal function.
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Affiliation(s)
- G J Huang
- Department of Otolaryngology-Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - M S Luo
- Department of Anesthesiology, the Second Affiliated Hospital of Nanchang University
| | - J X Zhang
- Department of Otolaryngology-Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - C M Zhu
- Department of Otolaryngology-Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - Y H Liu
- Department of Otolaryngology-Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China
| | - H B Liu
- Department of Otolaryngology-Head and Neck Surgery, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China
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13
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Huang GJ, Luo MS, Zhang JX, Zhu CM, Liu YH, Zhang HB. [Research progress of transoral robotic surgery in oropharyngeal cancer]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:159-161. [PMID: 29871213 DOI: 10.13201/j.issn.1001-1781.2017.02.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Indexed: 11/12/2022]
Abstract
When it comes to the treatment of oropharyngeal cancer, the recurrence rate is high after radiotherapy, chemotherapy or open surgery. Transoral robotic surgery is a relatively new surgical therapy in oropharyngeal cancer, which can promote the development of minimally invasive surgery of oropharyngeal cancer. In this study, we reviewed flap reconstruction techniques of transoral robotic surgery, outcomes, contraindications,advantages and disadvantages.
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14
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Huang GJ, Liu HB, Zhang JX, Luo MS, Zhu CM. [Application progress of transoral robotic surgery in treatment of laryngeal cancer]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:1744-1746. [PMID: 29871191 DOI: 10.13201/j.issn.1001-1781.2016.21.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Indexed: 11/12/2022]
Abstract
Transoral robotic surgery(TORS) with the Da Vinci robot has been used for the removal of laryngeal cancer,which can improve functional and aesthetic outcomes without worsening survival. We reviews the composition of the robotic surgical system, unique advantages, potential applications and limitations of existing solutions and prospects in Surgery for laryngeal cancer.Major technical improvements are expected. Smaller, more ergonomic, new-generation robots adapted to the head and neck will probably be available in the near future.
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15
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Huang GJ, Zhang JX, Luo MS, Zhu CM, Liu JG, Liu HB. [Advancement of salvage surgery for recurrent head andneck squamous cell carcinoma]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:1659-1663. [PMID: 29871168 DOI: 10.13201/j.issn.1001-1781.2016.20.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Indexed: 11/12/2022]
Abstract
The treatment options and prognosis of recurrent head and neck squamous cell carcinoma are largely determined by site, extent of disease,and previous treatment. Salvage surgery represents the primary curative option when recurrent head and neck squamous cell carcinoma is resectable. The common factors that affect the prognosis of patients undergoing salvage surgery include surgical resection margin pathology, radiation therapy, advanced initial and recurrent tumor stage, and presence of concomitant neck disease. This paper reviewed the advancement of salvage surgery for recurrent head and neck squamous cell carcinoma.
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16
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Liu RX, Li QZ, Xing LL, Peng Z, Zhu CM, Yang ZH. Genotyping of clinical Mycobacterium tuberculosis isolates based on eight loci of MIRU-VNTR. Int J Tuberc Lung Dis 2013; 17:243-5. [PMID: 23317961 DOI: 10.5588/ijtld.12.0777] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Genotyping that differentiates between strains of Mycobacterium tuberculosis based on variations in the genome of the organism is a useful tool for molecular epidemiological studies of tuberculosis. In the present study, we identified a combination of five mycobacterial interspersed repetitive unit (MIRU) loci and three variable numbers of tandem repeats (VNTR) loci of M. tuberculosis that showed a discriminatory power comparable to that of the 15 to 24 loci-based typing proposed for international standardisation in analysing 210 paediatric isolates obtained from Chongqing, China.
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Affiliation(s)
- R X Liu
- Department of Infectious Diseases and Gastroenterology, Key Laboratory of Paediatrics in Chongqing, Chongqing International Science and Technology Cooperation Centre for Child Development and Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
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17
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Li SX, Guan L, Zhang TG, Zhu CM, Lu ZW. [Rigid registration and fusion between SPECT and MRI/CT based on external fiducial alignment]. Zhongguo Yi Liao Qi Xie Za Zhi 2001; 25:192-195. [PMID: 12583214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A convenient and effective method of rigid registration and fusion between SPECT and MRI/CT which is based on external fiducial alignment system is designed. After thresholding the image, many image processing arithmetics such as erosion, dilation are used to ensure the corresponding points which will be used to registrate. Then these points are used to minimize the cost function. In this way, an optimal rigid transform is gotten to registrate the images accurately and fuse them well. Error in the registration and fusion is reduced furthest by well designing the N-shape bracket which is used as the external fiducial alignment system and also by limiting the relative displacement between the bracket and the patient. Experimentation shows that this method can realize the registration and fusion of SPECT and MRI/CT effectively.
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Affiliation(s)
- S X Li
- Department of Biomedical Engineering, Shanghai Jiao Tong University
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18
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Liu JB, Zhuang TG, Guan L, Zhu CM. [The development of a new version of multifunctional radioactive nuclide diagnostic instrument]. Zhongguo Yi Liao Qi Xie Za Zhi 2000; 24:143-146. [PMID: 12583120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A new kind of multifunctional radioactive nuclide diagnostic instrument is described here, which can make noninvasive measurements on the metabolic functions of five most important inner organs which are kidney, liver, heart and thyroid. The design of the hardware and software of the new instrument embodies many advanced advantages such as multifunctional integration, high accuracy and high reliability, computer controlled, automatic data-processing, easy to use and manage, and so on. Applications show that this is an advanced and efficient radioactive medical diagnostic instrument.
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Affiliation(s)
- J B Liu
- Department of Biomedical Engineering, Shanghai Jiao Tong University
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19
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Zhu CM, Chen QX, Lin HN, Yang Y, Park YD, Zhang RQ, Zhou HM. Kinetics of inhibition of green crab (Scylla serrata) alkaline phosphatase by L-cysteine. J Protein Chem 1999; 18:603-7. [PMID: 10524778 DOI: 10.1023/a:1020611602818] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The inhibition of alkaline phosphatase from green crab (Scylla serrata) by L-cysteine has been studied. The results show that L-cysteine gives a mixed-type inhibition. The progress-of-substrate-reaction method previously described by Tsou [(1988), Adv. Enzymol. Related Areas Mol. Biol. 61, 391-436] was used to study the inactivation kinetics of the enzyme by L-cysteine. The microscopic rate constants were determined for reaction of the inhibitor with the free enzyme and the enzyme-substrate complex (ES) The results show that inactivation of the enzyme by L-cysteine is a slow, reversible reaction. Comparison of the inactivation rate constants of free enzyme and ES suggests that the presence of the substrate offers marked protection of this enzyme against inactivation by L-cysteine.
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Affiliation(s)
- C M Zhu
- Department of Biological Science and Biotechnology, Tsinghua University, Beijing, China
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20
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Chen QX, Lu HY, Zhu CM, Lin HN, Zhou HM. The effects of N-thiophosphoryl amino acids on the activity of green crab (Scylla Serrata) alkaline phosphatase. Biochem Mol Biol Int 1998; 45:465-73. [PMID: 9679647 DOI: 10.1080/15216549800202852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Green crab (Scylla Serrata) alkaline phosphatase (EC 3.1.3.1) is a metalloenzyme which catalyzed the nonspecific hydrolysis of phosphate monoesters. In the present paper, the effects of several N-thiophosphoryl amino acids on the activity of green crab alkaline phosphatase have been studied. The results show that these derivatives of amino acids can lead to reversible inactivation. The equilibrium constants for inhibitors binding with the enzyme and/or the enzyme-substrate complexes have been determined. The obtained results show that both N-thiophosphoryl-Cys and N-thiophosphoryl-Glu were non-competitive inhibitors, while other five N-thiophosphoryl amino acids were un-competitive inhibitors. For the un-competitive inhibitors, the inhibition strength follows the order N-thiophosphoryl-Ile > -Val > -Lys > -Ala > -Tyr. Compared with respective free amino acids, it can be seen that N-thiophosphorylation of the amino acids increased their inhibition strength except the N-thiophosphoryl-Cys.
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Affiliation(s)
- Q X Chen
- Department of Biological Science and Biotechnology, Tsinghua University, Beijing, Xiamen, P. R. China
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21
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Sligh JE, Hurwitz MY, Zhu CM, Anderson DC, Beaudet AL. An initiation codon mutation in CD18 in association with the moderate phenotype of leukocyte adhesion deficiency. J Biol Chem 1992; 267:714-8. [PMID: 1346132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023] Open
Abstract
Leukocyte adhesion deficiency (LAD) is an autosomal recessive disease caused by mutations in the CD18 gene which codes for the beta 2 integrin subunit. We studied two patients, the first of which had a moderate LAD phenotype and expressed only 9% of CD11/CD18 on blood leukocytes. RNA from lymphoblasts was reverse-transcribed, and the cDNA was amplified, cloned, and sequenced. An ATG to AAG alteration in the initiation codon was detected in 39 of 45 (87%) cDNA clones. This mutation was detected in the father, but not in the mother. The maternal defect was shown to be a frameshift mutation with the deletion of a single T in the aspartic acid codon at position 690 (GAT), 11 amino acids N-terminal to the beginning of the transmembrane domain. This mutation predicts a polypeptide which would terminate without transmembrane or cytoplasmic domains. The frameshift mutation was also found in the second patient who had the severe phenotype of LAD (less than 1% of CD11/CD18), indicating that this allele does not encode a functional protein. The partial expression in the patient with a moderate phenotype must be derived from the initiation codon mutation and may be due to a low level of initiation of translation of the CD18 mRNA at the second codon (CUG).
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Affiliation(s)
- J E Sligh
- Institute for Molecular Genetics, Baylor College of Medicine, Houston, Texas 77030
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22
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Sligh JE, Hurwitz MY, Zhu CM, Anderson DC, Beaudet AL. An initiation codon mutation in CD18 in association with the moderate phenotype of leukocyte adhesion deficiency. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)48342-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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23
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Zhu CM. [A contrast between the MMPI with the System Check List 90]. Zhonghua Shen Jing Jing Shen Ke Za Zhi 1990; 23:339-41, 383. [PMID: 2098243] [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: 12/30/2022]
Abstract
This study tested 131 patients with psychoses and contrasted the MMPI with the SCL-90. It was found that the nine groups of elemental symptoms in the SCL-90 was highly related with the corresponding symptoms in the MMPI. However, the relatively of groups in the two scales is different in the three diseases of schizophrenia, depression and neurosis. It was expressed that the three mental diseases possessed different psychopathologic characters. The result corresponded to clinical experience and also showed that SCL-90 was a self-rating scale with higher validity and spread of the scale was feasible.
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Affiliation(s)
- C M Zhu
- West China University of Medical Sciences, Chengdu
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Abstract
In Physarum flavicomum Berk., haploid myxamoebae convert to dormant microcysts under conditions of nutrient imbalance. Exogenous adenine increases the intracellular content of S-adenosylmethionine (SAM) and inhibits this process. However, treatments that reduce the intracellular SAM levels relieve the inhibition of encystment induced by adenine. SAM plays a major metabolic role in cellular transmethylation reactions. In this study, we compared the DNA methylation patterns of growing cells, encysting cells, adenine-inhibited cells, and cysts using three different approaches: incubation of the cells with [14C]methylmethionine and detection of the labeled methyl group in purified DNA samples; analyses of DNA base composition by high performance liquid chromatography; and restriction endonuclease analyses of DNA. We found that DNA from the adenine-treated cells was labelled 1.3 times more with [14C]methylmethionine than was the DNA of untreated encysting cells. The DNA G + C content of this species was about 41%. The DNA of growing cells had the highest 5-methylcytosine (5MC) content, while DNA from the cysts had the lowest (about 27% that of growing cells). Adenine-inhibited cells had about 1.2 times more DNA-5MC than did encysting cells. Using the restriction enzymes SmaI, PvuI, and XhoI (which are inhibited by C residue methylation), we found that cyst DNA had more cutting sites than did amoebal DNA. By using the restriction enzyme DpnI which cuts DNA at GmATC sites, we found that cyst DNA, but not growing cell DNA, contained N6-methyladenine.
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Affiliation(s)
- C M Zhu
- Department of Biology, University of Houston, TX 77204-5513
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Abstract
In Physarum flavicomum Berk., growing amoebae convert to dormant cysts under conditions of nutrient imbalance. Exogenous adenine inhibits the process and the cells produce an elevated intracellular concentration of S-adenosylmethionine. Evidence indicates that the increased level of S-adenosylmethionine is responsible for the disruption of the normal developmental process. One of the biological functions of S-adenosylmethionine is in polyamine synthesis and it is known that a well-controlled intracellular concentration of polyamines is essential for normal cell growth and differentiation. In this study, high-performance liquid chromatography was used to determine the intracellular polyamine patterns in growing cells, adenine-treated and normal encysting cells, and dormant cysts. Putrescine and spermidine were the most abundant polyamines found in the cells; growing cells had the highest level, adenine-treated cells had a 1.5 to 2.0 times higher level than normal encysting cells, while cysts had the lowest (only 3 and 12% of that of growing cells). Cadaverine and N1-acetylspermidine were found in all the cells and their levels decreased during encystment. Acetylputrescine was found in growing cells only and acetylspermine was found in all cells except cysts. Acetylcadaverine, N8-acetylspermidine, 1,3-diaminopropane, and spermine were not detected in any of the cells.
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Affiliation(s)
- C M Zhu
- Department of Biology, University of Houston, TX 77204-5513
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Abstract
We have used High Performance Liquid Chromatography to determine metabolite characteristics of three recent isolates of Acanthamoeba which exhibit cultural characteristics consistent with those of established potential pathogens. Growing amoebae and dormant cysts of these isolates were explored in regard to their qualitative and quantitative intracellular levels of polyamine and S-adenosylmethionine metabolites. The polyamine found in the greatest concentration in the growing cells was 1,3-diaminopropane (DAP), followed by spermidine (SPD). A low level of putrescine was also found in the growing cells. These polyamines significantly decreased in concentration as the amoebae differentiated to cysts. N8-acetylspermidine and acetylspermine were found in both developmental stages while acetylcadaverine was found only in growing amoebae and N1-acetylspermidine only in cysts. Acetylputrescine was present in both stages of two isolates but only in the growing amoebae of the third isolate. Spermine was not detected in any of the isolates. S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) were present in growing amoebae but SAM was undetectable or barely detectable in cysts. SAH also decreased in concentration during encystation of two of the isolates to a level comparable to that of the other isolate. The developmental transition from growing amoebae to dormant cysts is characterized metabolically by a threshold adjustment in concentration of SAM, SAH and of the polyamines (esp., DAP and SPD).
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Affiliation(s)
- C M Zhu
- Department of Biology, University of Houston, TX 77204-5513
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Zhu CM. [The rating results of 271 neurotics based on symptomatic scales]. Zhonghua Shen Jing Jing Shen Ke Za Zhi 1986; 19:294-6. [PMID: 3582015] [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: 01/06/2023]
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Zhu CM. [Assessment of the severity of depression]. Zhonghua Shen Jing Jing Shen Ke Za Zhi 1985; 18:295-7. [PMID: 3833516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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29
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Zhu CM, Yang CF, Ma YG. [An investigation of intelligence in 105 normal elderly people in Chengdu]. Sichuan Yi Xue Yuan Xue Bao 1985; 16:74-7. [PMID: 4012595] [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: 01/08/2023]
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30
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Zhu CM, Shi AL, Xu SX. [Evaluation of radio-immunoassay of digoxin in the diagnosis of digitalis intoxication (author's transl)]. Zhonghua Xin Xue Guan Bing Za Zhi 1980; 8:174-8. [PMID: 7307939] [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: 01/24/2023]
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