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Wang BC, Ge ZW, Cheng ZY, Hu JL, Sun JJ, Xuan JZ, Ding FY. [The value of preservation of subvalvular structures in patients with mitral and aortic valve replacement surgery and its effect on left ventricular contractility]. Zhonghua Yi Xue Za Zhi 2022; 102:1839-1845. [PMID: 35725363 DOI: 10.3760/cma.j.cn112137-20220119-00138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To discuss the clinical value of preserving subvalvular structure in mitral and aortic valve replacement surgery and its effect on left ventricular contractility. Methods: A total of 97 patients who underwent mitral valve replacement surgery in the Adult Cardiac Surgery of Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital from June 2016 to December 2018 were selected as the research subjects, of whom 45 cases were preserved subvalvular structure and 52 cases were in the total resection group (intraoperative total resection of the mitral valve and subvalvular chordae tendineae). General cardiac function indexes and left ventricular function quantitative indexes were compared before and in 3 months and 6 months after the operation of the two groups; The changes of the overall longitudinal strain of the long axis of the apex and the overall circumferential strain of the short axis of the left ventricle determined by the two-dimensional speckle tracking technology were compared before and after the operation. Results: The ages of the patients in the preservation group and the total resection group were (41.8±11.3) and (43.3±10.6) years old, respectively, and the male proportions were 58.0% (26 cases) and 44.0% (23 cases), respectively, with no significant difference (all P>0.05). The aortic occlusion time and cardiopulmonary bypass time of the patients in the preservation group were (57.8±4.5) and (78.6±6.7) min, respectively, which were longer than those in the total resection group [(48.1±4.4) and (48.1±4.4) min, respectively] (all P<0.05). The left atrial pressure of the patients in the preservation group at shutdown was (8.4±1.8) mmHg (1 mmHg=0.133 kPa), which was lower than that of the total resection group (11.3±2.5) mmHg (P<0.001). There were interaction effects between groups and time in regards to the left ventricular end-diastolic diameter ( LVEDD ), left ventricular ejection fraction ( LVEF ) and Tei index, as well as the strain rate of mitral annulus and left ventricular wall of interventricular septum of the preservation group and the total resection group (all P<0.05). LVEDD and LVEF of patients in the preservation group at 3rd month after operation were (44.7±4.0) mm and (45.5±4.2) mm, and at 6th months were (56.5±4.9)% and (58.8±5.0)%, respectively, all larger than (42.7±3.6) mm and (42.7±3.6) mm, (54.5±4.6)% and (56.3±4.8)% of the total resection group. The measured value of LVESD in the preservation group at 3rd month after surgery was (32.6±3.2) mm, which was greater than that in the total resection group (31.2±3.4) mm (P<0.05). The Tei index of patients in the preservation group at 3rd and 6th months after surgery were 1.0±0.2 and 0.8±0.2, respectively, which were lower than those in the total resection group 1.2±0.3 and 0.9±0.2 (all P<0.05). Conclusion: Preserving the subvalvular structure during mitral valve replacement surgery can better improve the patient's left ventricular function and left ventricular systolic capacity.
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Affiliation(s)
- B C Wang
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
| | - Z W Ge
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
| | - Z Y Cheng
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
| | - J L Hu
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
| | - J J Sun
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
| | - J Z Xuan
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
| | - F Y Ding
- Adult Cardiac Surgery, Heart Center of Henan Provincial People's Hospital, Central China Fuwai Hospital, Central China Fuwai Hospital of Zhengzhou University , Zhengzhou 450003, China
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Huang RX, Duan XY, Liu XL, Cao HX, Wang YQ, Fan JG, Wang BC. [Role and mechanism of miRNA-181a in nonalcoholic fatty liver disease]. Zhonghua Gan Zang Bing Za Zhi 2021; 29:1177-1181. [PMID: 35045633 DOI: 10.3760/cma.j.cn501113-20200527-00279] [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: 06/14/2023]
Abstract
Objective: To investigate the role and probable mechanism of miRNA-181a in nonalcoholic fatty liver disease. Methods: HepG2 cells were treated with palmitic acid to construct a nonalcoholic fatty liver disease cell model, and the expression of miR-181a and lipidosis in the cells were measured. Transforming growth factor-β (TGF-β) was used to examine the effect of miR-181a expression in HepG2 cells. The miR-181a, lipidosis, reduced glutathione and reactive oxygen species (ROS) were determined by controlling and regulating the miR-183 expression levels after transfection with miR-181 mimics and inhibitors in HepG2 cells. The miR-181a target genes were predicted by bioinformatics analysis, and verified by real-time fluorescent quantitative PCR and western blotting. The independent sample t-test was used for the comparison between the two independent samples, and the comparison between multiple groups were accorded with the normal distribution, homogeneity of variance, and one-way analysis of variance. Results: Lipidosis was significantly increased after palmitic acid treatment in HepG2 cells, and the expression level of miR-181a was significantly increased than control group. After HepG2 cells were transfected with miR-181a inhibitors, the expression of miR-181a, triglycerides and reactive oxygen species were down-regulated, and reduced glutathione, predicting the mRNA and protein expression of target gene silencing information regulator 2 related enzyme 1 were up-regulated. However, the results were contrary to the above changes after transfection with miR-181a mimics. Conclusion: miR-181a participates in lipidosis and promotes lipid peroxidation in nonalcoholic fatty liver disease. miR-181a may affect the pathogenesis and progression of nonalcoholic fatty liver disease by inhibiting the expression of silencing information regulator 2 related enzyme 1.
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Affiliation(s)
- R X Huang
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - X Y Duan
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - X L Liu
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - H X Cao
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - Y Q Wang
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - J G Fan
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
| | - B C Wang
- Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
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Wong ILK, Wang XK, Liu Z, Sun W, Li FX, Wang BC, Li P, Wan SB, Chow LMC. Synthesis and evaluation of stereoisomers of methylated catechin and epigallocatechin derivatives on modulating P-glycoprotein-mediated multidrug resistance in cancers. Eur J Med Chem 2021; 226:113795. [PMID: 34597896 DOI: 10.1016/j.ejmech.2021.113795] [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: 04/23/2021] [Revised: 07/13/2021] [Accepted: 08/20/2021] [Indexed: 11/15/2022]
Abstract
P-glycoprotein (P-gp; ABCB1)-mediated drug efflux causes multidrug resistance in cancer. Previous synthetic methylated epigallocatechin (EGC) possessed promising P-gp modulating activity. In order to further improve the potency, we have synthesized some novel stereoisomers of methylated epigallocatechin (EGC) and gallocatechin (GC) as well as epicatechin (EC) and catechin (C). The (2R, 3S)-trans-methylated C derivative 25 and the (2R, 3R)-cis-methylated EC derivative 31, both containing dimethyoxylation at ring B, tri-methoxylation at ring D and oxycarbonylphenylcarbamoyl linker between ring D and C3, are the most potent in reversing P-gp mediated drug resistance with EC50 ranged from 32 nM to 93 nM. They are non-toxic to fibroblast with IC50 > 100 μM. They can inhibit the P-gp mediated drug efflux and restore the intracellular drug concentration to a cytotoxic level. They do not downregulate surface P-gp protein level to enhance drug retention. They are specific for P-gp with no or low modulating activity towards MRP1- or BCRP-mediated drug resistance. In summary, methylated C 25 and EC 31 derivatives represent a new class of potent, specific and non-toxic P-gp modulator.
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Affiliation(s)
- Iris L K Wong
- Department of Applied Biology and Chemical Technology and State Key Laboratory of Chemical Biology and Drug Discovery, Hong Kong Polytechnic University, Hong Kong, China
| | - Xing-Kai Wang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Zhen Liu
- Department of Applied Biology and Chemical Technology and State Key Laboratory of Chemical Biology and Drug Discovery, Hong Kong Polytechnic University, Hong Kong, China; Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Wenqin Sun
- Department of Applied Biology and Chemical Technology and State Key Laboratory of Chemical Biology and Drug Discovery, Hong Kong Polytechnic University, Hong Kong, China
| | - Fu-Xing Li
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Bao-Chao Wang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Peng Li
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Sheng-Biao Wan
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
| | - Larry M C Chow
- Department of Applied Biology and Chemical Technology and State Key Laboratory of Chemical Biology and Drug Discovery, Hong Kong Polytechnic University, Hong Kong, China.
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Wang GC, Gao CQ, Liu YJ, Han GS, Wang YC, Zhang GQ, Ding LL, Li B, Wang BC, Chang SW. [Retrospective analysis of curative effect of total pelvic organ resection and anal preservation in 20 patients with recurrence of cervical cancer after radical radiotherapy]. Zhonghua Zhong Liu Za Zhi 2020; 42:242-246. [PMID: 32252204 DOI: 10.3760/cma.j.cn112152-20190806-00504] [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 explore the surgical method and effect of en bloc pelvic resection and anal preservation after radical radiotherapy for cervical cancer. Methods: Clinical data of 20 cervical cancer patients with central recurrence after radical radiotherapy underwent en bloc pelvic resection in the Tumor Hospital of Zhengzhou University and Hainan Provincial People's Hospital from January 2013 to December 2017 were retrospectively analyzed. The operative time, intraoperative blood loss, length of stay, postoperative anal function and postoperative complications were evaluated. Results: The median operation time of 20 patients with anal preservation after en bloc pelvic resection was 135.2 min, the median intraoperative blood loss was 680 ml, and the median hospitalization time was 16.5 days. Among them, 18 patients had good postoperative healing, and the anal function gradually returned to normal within 6 months after surgery, defecated 1~2 times per day.One patient showed incomplete adhesion between the external colon and the anus. One patient presented with pre-sacral infection. Postoperative pathology confirmed the recurrences in 20 patients, of which 11 cases were squamous cell carcinoma, 7 cases were adenocarcinoma, 2 cases were adenosquamous cell carcinoma. Conclusions: It is safe and reliable to preserve anus after en bloc pelvic resection for cervical cancer patients with radical radiotherapy. The anus function is good enough to improve the postoperative life quality of patients significantly.
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Affiliation(s)
- G C Wang
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - C Q Gao
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - Y J Liu
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - G S Han
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - Y C Wang
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - G Q Zhang
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - L L Ding
- Department of General Surgery, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - B Li
- Department of General Surgery, Hainan People's Hospital, Haikou 570100, China
| | - B C Wang
- Department of General Surgery, Hainan People's Hospital, Haikou 570100, China
| | - S W Chang
- Department of General Surgery, Hainan People's Hospital, Haikou 570100, China
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Zhou MJ, Chen XH, Kou XJ, Wang BC. [A new method: lower trapezius island myocutaneous flap to repair surgical defect in lateral skull base cancer after radiotherapy]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2020; 55:410-412. [PMID: 32306644 DOI: 10.3760/cma.j.cn115330-20190825-00528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- M J Zhou
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery(Capital Medical University), Ministry of Education, Beijing 100730, China
| | - X H Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery(Capital Medical University), Ministry of Education, Beijing 100730, China
| | - X J Kou
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery(Capital Medical University), Ministry of Education, Beijing 100730, China
| | - B C Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery(Capital Medical University), Ministry of Education, Beijing 100730, China
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Li YS, Jiang BY, Yang JJ, Zhang XC, Zhang Z, Ye JY, Zhong WZ, Tu HY, Chen HJ, Wang Z, Xu CR, Wang BC, Du HJ, Chuai S, Han-Zhang H, Su J, Zhou Q, Yang XN, Guo WB, Yan HH, Liu YH, Yan LX, Huang B, Zheng MM, Wu YL. Unique genetic profiles from cerebrospinal fluid cell-free DNA in leptomeningeal metastases of EGFR-mutant non-small-cell lung cancer: a new medium of liquid biopsy. Ann Oncol 2019; 29:945-952. [PMID: 29346604 DOI: 10.1093/annonc/mdy009] [Citation(s) in RCA: 180] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Background Leptomeningeal metastases (LM) are more frequent in non-small-cell lung cancer (NSCLC) with epidermal growth factor receptor (EGFR) mutations. Due to limited access to leptomeningeal lesions, the purpose of this study was to explore the potential role of cerebrospinal fluid (CSF) as a source of liquid biopsy in patients with LM. Patients and methods Primary tumor, CSF, and plasma in NSCLC with LM were tested by next-generation sequencing. In total, 45 patients with suspected LM underwent lumbar puncture, and those with EGFR mutations diagnosed with LM were enrolled. Results A total of 28 patients were enrolled in this cohort; CSF and plasma were available in 26 patients, respectively. Driver genes were detected in 100% (26/26), 84.6% (22/26), and 73.1% (19/26) of samples comprising CSF cell-free DNA (cfDNA), CSF precipitates, and plasma, respectively; 92.3% (24/26) of patients had much higher allele fractions in CSF cfDNA than the other two media. Unique genetic profiles were captured in CSF cfDNA compared with those in plasma and primary tissue. Multiple copy number variations (CNVs) were mainly identified in CSF cfDNA, and MET copy number gain identified in 47.8% (11/23) of patients was the most frequent one, while other CNVs included ERBB2, KRAS, ALK, and MYC. Moreover, loss of heterozygosity (LOH) of TP53 was identified in 73.1% (19/26) CSF cfDNA, which was much higher than that in plasma (2/26, 7.7%; P < 0.001). There was a trend towards a higher frequency of concomitant resistance mutations in patients with TP53 LOH than those without (70.6% versus 33.3%; P = 0.162). EGFR T790M was identified in CSF cfDNA of 30.4% (7/23) of patients who experienced TKI progression. Conclusion CSF cfDNA could reveal the unique genetic profiles of LM and should be considered as the most representative liquid biopsy medium for LM in EGFR-mutant NSCLC.
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Affiliation(s)
- Y S Li
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - B Y Jiang
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - J J Yang
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - X C Zhang
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Z Zhang
- Burning Rock Biotech, Guangzhou, China
| | - J Y Ye
- Burning Rock Biotech, Guangzhou, China
| | - W Z Zhong
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H Y Tu
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H J Chen
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Z Wang
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - C R Xu
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - B C Wang
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H J Du
- Department of Pulmonology, General Hospital of Guangzhou Military Command, Guangzhou, China
| | - S Chuai
- Burning Rock Biotech, Guangzhou, China
| | | | - J Su
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Q Zhou
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - X N Yang
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - W B Guo
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H H Yan
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Y H Liu
- Department of Pathology, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - L X Yan
- Department of Pathology, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - B Huang
- Department of Radiology, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - M M Zheng
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Y L Wu
- Guangdong Provincial Key Laboratory of Translational Medicine in Lung Cance, Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China.
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Zhang WY, Wang BC. [Rosette-forming glioneuronal tumor in vermis: report of a case]. Zhonghua Bing Li Xue Za Zhi 2019; 48:718-720. [PMID: 31495094 DOI: 10.3760/cma.j.issn.0529-5807.2019.09.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- W Y Zhang
- Department of Pathology, Zhongnan Hospital of Wuhan University; Wuhan University Center for Pathology and Molecular Diagnostics; Department of Pathology, Wuhan University School of Medicine; Wuhan 430000, China
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Lei Y, Xing QZ, Wang BC, Zheng SX, Tang R, Ma PF, Zhang HY, Guan XL, Wang XW, Du CT, Guo QK, Li J, Guan WQ. Radio frequency measurement and tuning of a 13 MeV Alvarez-type drift tube linac for a compact pulsed hadron source. Rev Sci Instrum 2019; 90:013302. [PMID: 30709192 DOI: 10.1063/1.5064462] [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] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 12/23/2018] [Indexed: 06/09/2023]
Abstract
This paper describes the radio frequency (RF) measurement and tuning result of a 13 MeV Alvarez-type drift tube linac (DTL) for a compact pulsed hadron source (CPHS) at Tsinghua University. The design, machining, assembly, and alignment of the DTL are presented for integrity. The CPHS project consists of a high-current proton linac (13 MeV, 16 kW, peak current of 50 mA, 0.5 ms pulse width at 50 Hz), a neutron target station, a small-angle neutron scattering instrument, and a neutron imaging/radiology station. The linac contains an electron cyclotron resonance ion source, a low energy beam transport line, a four-vane radio frequency quadrupole (RFQ) accelerator, an Alvarez-type DTL, a high energy beam transport line, and a RF power supply and distributor. Construction on the CPHS started in June 2009, and the CPHS has provided 2000 h since 2013 to users with the neutrons produced by the 3 MeV proton beam from the radio frequency quadrupole bombarding on the beryllium target as an achievement of its mid-term objective. Presently, the tuning of the assembled DTL cavity has been completed successfully. The 4.3-m-long DTL consists of 40 accelerating cells, among which 39 full-length drift tubes (DTs) are suspended inside the cavity, and two half-length DTs are mounted inside the two end flanges of the cavity. Each DT contains a permanent magnet quadrupole. Thirteen post couplers and nine tuners are available for the tuning of the field. The relative error of the field after tuning is within ±1.6%, with a tilt sensitivity within ±33%/MHz in all cells. The beam energy will reach its designed value of 13 MeV after the DTL is installed in the beam line downstream the 3 MeV RFQ accelerator.
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Affiliation(s)
- Y Lei
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - Q Z Xing
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - B C Wang
- State Key Laboratory of Intense Pulsed Radiation Simulation and Effect (Northwest Institute of Nuclear Technology), Xi'an 710024, China
| | - S X Zheng
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - R Tang
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - P F Ma
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - H Y Zhang
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - X L Guan
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - X W Wang
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - C T Du
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - Q K Guo
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - J Li
- Nuctech Company Limited, Beijing 100084, China
| | - W Q Guan
- Nuctech Company Limited, Beijing 100084, China
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Huang RX, Wang BC, Fan JG. [Research advances of relationship between non-alcoholic fatty liver disease and biliary tract diseases]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:633-636. [PMID: 29056017 DOI: 10.3760/cma.j.issn.1007-3418.2017.08.016] [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
Recent studies have found that non-alcoholic fatty liver disease(NAFLD) has great impact on the development of biliary tract diseases. Here in this review, we summarized the relationship between NAFLD and the occurrence and development, risk factors and severity of cholestasis, gallstones, intrahepatic cholangiocarcinoma, primary biliary cirrhosis and bile microbiota, so as to further illuminate the pathogenesis of NAFLD and biliary tract diseases, obtain better diagnostic and therapeutic outcomes on NAFLD and biliary tract diseases.
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Affiliation(s)
- R X Huang
- Department of Gastroenterology, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, China
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Feng YR, Chen XH, Kou XJ, Bai YL, Lu FQ, Yang J, Wang BC. [Individualized treatment of bilateral carotid body tumor]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 52:37-43. [PMID: 28104014 DOI: 10.3760/cma.j.issn.1673-0860.2017.01.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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 individualized therapeutic strategy for bilateral carotid body tumors. Methods: Clinical data of 16 patients with bilateral carotid body tumor treated from January 2003 to August 2016 were retrospectively studied. Of the 16 patients, 9 were males and 7 were females; 5 were sporadic and 11 were familial; 8 cases were observed, 1 cases was malignant and treated with chemotherapy, and 7 cases were treated with surgery. The treatment course, perioperative complications and clinical efficacy were assessed. Comprehensive evaluation of bilateral carotid body tumors was performed based on the size of bilateral tumor, clinical manifestations, genetic tests and other indicators. Individual treatment strategies included observation, surgery and observation, bilateral surgery, radiotherapy or chemotherapy. Surgical resection of carotid body tumor was unilateral in 3 cases and bilateral in 3 cases; removal of bilateral carotid body tumors plus unilateral jugular bulb in 1 case; and the internal carotid artery was reconstructed with autologous greater saphenous vein in 1 case. Results: All patients were followed up for 3 months to 12 years. There was no patient death during perioperative period. Superior laryngeal nerve injury occurred in 2 case. Baroreceptor failure syndrome occurred in one patient, but it gradually recoverd with medical treatments. Conlusion: It is important to identify whether bilateral carotid body tumors are hereditary and to make an individualized therapeutic strategy for each patient with bilateral carotid body tumors, focusing on the improvement in the quality of life of patient.
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Affiliation(s)
- Y R Feng
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
| | - X H Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
| | - X J Kou
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
| | - Y L Bai
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
| | - F Q Lu
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
| | - J Yang
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
| | - B C Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Key Laboratory of Otorhinolaryngology Head and Neck Surgery, Ministry of Education, Beijing 100730, China
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Yang JJ, Zhou Q, Yan HH, Zhang XC, Chen HJ, Tu HY, Wang Z, Xu CR, Su J, Wang BC, Jiang BY, Bai XY, Zhong WZ, Yang XN, Wu YL. A phase III randomised controlled trial of erlotinib vs gefitinib in advanced non-small cell lung cancer with EGFR mutations. Br J Cancer 2017; 116:568-574. [PMID: 28103612 PMCID: PMC5344291 DOI: 10.1038/bjc.2016.456] [Citation(s) in RCA: 127] [Impact Index Per Article: 18.1] [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: 07/31/2016] [Revised: 12/18/2016] [Accepted: 12/22/2016] [Indexed: 01/14/2023] Open
Abstract
Background: A phase III trial was conducted to compare the safety and efficacy of erlotinib with that of gefitinib in advanced non-small cell lung cancer harbouring epidermal growth factor receptor mutations in exon 19 or 21. Methods: Eligible patients were randomised to receive erlotinib (150 mg per day) or gefitinib (250 mg per day) orally until disease progression or unacceptable toxicity. We aimed to determine whether erlotinib is superior to gefitinib in efficacy. The primary end point was progression-free survival. Results: A total of 256 patients were randomised to receive erlotinib (N=128) or gefitinib (N=128). Median progression-free survival was not better with erlotinib than with gefitinib (13.0 vs 10.4 months, 95% confidence interval (CI) 0.62–1.05, P=0.108). The corresponding response rates and median overall survival were 56.3% vs 52.3% (P=0.530) and 22.9 vs 20.1 months (95% CI 0.63–1.13, P=0.250), respectively. There were no significant differences in grade 3/4 toxicities between the two arms (P=0.172). Conclusions: The primary end point was not met. Erlotinib was not significantly superior to gefitinib in terms of efficacy in advanced non-small cell lung cancer with epidermal growth factor receptor mutations in exon 19 or 21, and the two treatments had similar toxicities.
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Affiliation(s)
- J J Yang
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Q Zhou
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H H Yan
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - X C Zhang
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H J Chen
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - H Y Tu
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Z Wang
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - C R Xu
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - J Su
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - B C Wang
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - B Y Jiang
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - X Y Bai
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - W Z Zhong
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - X N Yang
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Y L Wu
- Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
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Zhao GF, Hu YH, Liu RL, Shi F, Li HP, Wang DH, Wang BC. [Clinical significance of the preoperative neutrophil lymphocyte ratio in the evaluation of the prognosis of laryngeal carcinoma]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 51:112-6. [PMID: 26898867 DOI: 10.3760/cma.j.issn.1673-0860.2016.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To explore the effect of preoperative neutrophil lymphocyte ratio (NLR) on the prognosis of patients with laryngeal carcinoma. METHODS Clinical data of 202 patients with laryngeal carcinoma treated from January 2004 to October 2009 were retrospective analyzed to determine the optimal critical value of NLR. To study whether NLR is an independent factor affecting the recurrence and 5-year survival rate of patients with laryngeal cancer after surgery, single factor and multivariate analyses were performed. The factors included age, gender, T stage, pathological differentiation, lymph node metastasis, primary tumor site and NLR value. The relationship between NLR and cervical lymph node metastasis was analyzed. RESULTS The optimal critical value of NLR was 2.85, by which cases were divided into high NLR group (NLR≥2.85) and low NLR group (NLR<2.85). Single factor and multivariate analyses indicated that T staging, lymph node metastasis, primary tumor location, and NLR were the independent factors affecting the recurrence of laryngeal carcinoma. T stage and lymph node metastasis were the independent factors affecting 5-year survival rate of laryngeal carcinoma. The increase of NLR value increased the rate of cervical lymph node metastasis. CONCLUSION Preoperative NLR level influences the recurrence and cervical lymph node metastasis of laryngeal carcinoma and can be considered a prognosis factor of laryngeal cancer.
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Affiliation(s)
- G F Zhao
- Department of Otorhinolaryngology-Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan 063000, China
| | - Y H Hu
- Department of Otorhinolaryngology-Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan 063000, China
| | - R L Liu
- Department of Otorhinolaryngology-Head and Neck Surgery, North China University of Science and Technology Hospital, Tangshan 063000, China
| | - F Shi
- Department of Otorhinolaryngology-Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan 063000, China
| | - H P Li
- Department of Ultrasonography, Tangshan Xiehe Hospital, Tangshan 063000, China
| | - D H Wang
- Department of Otorhinolaryngology-Head and Neck Surgery, Tangshan Xiehe Hospital, Tangshan 063000, China
| | - B C Wang
- Department of Otorhinolaryngology, People's Hospital of Zunhua City, Tangshan 064200, China
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Wong ILK, Wang BC, Yuan J, Duan LX, Liu Z, Liu T, Li XM, Hu X, Zhang XY, Jiang T, Wan SB, Chow LMC. Potent and Nontoxic Chemosensitizer of P-Glycoprotein-Mediated Multidrug Resistance in Cancer: Synthesis and Evaluation of Methylated Epigallocatechin, Gallocatechin, and Dihydromyricetin Derivatives. J Med Chem 2015; 58:4529-49. [DOI: 10.1021/acs.jmedchem.5b00085] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Iris L. K. Wong
- Department
of Applied Biology and Chemical Technology, and State Key Laboratory
of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China
| | - Bao-Chao Wang
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Jian Yuan
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Liang-Xing Duan
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Zhen Liu
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Tao Liu
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Xue-Min Li
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Xuesen Hu
- Department
of Applied Biology and Chemical Technology, and State Key Laboratory
of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China
| | - Xiao-Yu Zhang
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Tao Jiang
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Sheng-Biao Wan
- Key
Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial
Key Laboratory of Glycoscience & Glycotechnology, School of Medicine
and Pharmacy, Ocean University of China, Qingdao, China
| | - Larry M. C. Chow
- Department
of Applied Biology and Chemical Technology, and State Key Laboratory
of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China
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Li CJ, Wang BC, Liu DQ. Double-loop locking cross-stitch suture and suspension fixation for medial collateral ligament origin reconstruction. Genet Mol Res 2014; 13:5405-12. [PMID: 25078597 DOI: 10.4238/2014.july.24.20] [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: 11/03/2022]
Abstract
The purpose of this study was to summarize the clinical application and results of the double-loop locking cross-stitch suture and suspension fixation method for medial collateral ligament origin reconstruction. Thirty-six patients (21 males, 15 females) with an average age of 40 years (range = 17-58 years), who underwent treatment for acute fracture of the medial collateral ligament at our hospital from February 2008 to May 2009, were included in this study. All patients presented unilateral injuries (17 right-sided, 19 left-sided) and underwent repair with the double-loop locking cross-stitch suture and suspension fixation method. All incisions in this group of patients healed by first intention. Thirty-two patients were followed up for 6-20 months (average = 12 months). There were no reports of wound infection, ligament re-fracture or other complications in the follow-up period. Based on the Lysholm knee-scoring scale, the patients received a 100% excellent and good rating (20 patients - excellent score, 12 patients - good score) postoperatively. The advantages of the double-loop locking cross-stitch suture and suspension fixation method are a smaller incision, reliable fixation, and early restoration of knee joint stability. It is, therefore, an effective and low-risk method for the reconstruction of medial collateral ligament origin.
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Affiliation(s)
- C J Li
- Department of Hand Surgery, Tangshan Second Hospital, Tangshan, Hebei, China
| | - B C Wang
- Department of Hand Surgery, Tangshan Second Hospital, Tangshan, Hebei, China
| | - D Q Liu
- Department of Hand Surgery, Tangshan Second Hospital, Tangshan, Hebei, China
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Lv YF, Li XQ, Gong XG, Xie XH, Han XY, Wang BC. Effect of surgery treatment on hypersplenism caused by cirrhotic portal hypertension. MINERVA CHIR 2013; 68:409-413. [PMID: 24019049] [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]
Abstract
AIM Aim of the study was to summarize the types and quantities of peripheral hematocytopenia in the patients of hypersplenism caused by cirrhotic portal hypertension and investigate the effect of surgery, including splenectomy on the patient's peripheral blood cells and liver function. METHODS The quantities of peripheral blood cells in the 322 patients of hypersplenism, caused by cirrhotic portal hypertension, were retrospectively studied. Then, the preoperative and postoperative values of peripheral blood cells and liver function were compared in 266 patients who were followed up. The liver function was scored and graded according to Child-Pugh scoring system. RESULTS The study enrolled 322 patients who showed hematocytopenia, including multi-hemocyte decrease in 206 patients (64%) and simple hemocyte decrease in 116 patients (36%). After surgical treatment in the 226 patients who were followed up, the quantities of peripheral blood cells significantly increased (P<0.01), Child-Pugh grade A increased by 32 patients (14.2%), while Child-Pugh grade C increased only by 2 patients (0.9%), the liver function scores decreased (P<0.05). CONCLUSION Hypersplenism caused by cirrhotic portal hypertension mainly manifests as a multi-hemocyte decrease and rarely shows single types of hematocytopenia. Surgical intervention including splenectomy can increase the reduction of hemocytes and promote the recovery of liver function.
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Affiliation(s)
- Y F Lv
- Department of Surgery People's Hospital of Hainan Province Haikou City, China -
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Petz L, Jaing TH, Rosenthal J, Karanes C, Nademanee A, Chan LL, Graham ML, Lin HP, Tan P, Wang BC, Fu C, Chow M, Forman S, Chow R. Analysis of 120 pediatric patients with nonmalignant disorders transplanted using unrelated plasma-depleted or -reduced cord blood. Transfusion 2011; 52:1311-20. [PMID: 22098396 DOI: 10.1111/j.1537-2995.2011.03452.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Unrelated cord blood (CB) is an important stem cell source for unrelated hematopoietic cell transplantation (HCT) of patients with nonmalignant disorders. Processing methods to prepare red blood cell-reduced CB units incur significant nucleated cell loss. In contrast, plasma depletion or reduction (PDR) processing of CB units entails the removal of only a portion of the plasma with minimal nucleated cell loss. However, there are relatively limited data regarding outcomes of CB transplants using units processed by PDR. STUDY DESIGN AND METHODS A Center for International Blood and Marrow Transplant Research (CIBMTR)-audited analysis was performed on 120 pediatric patients with nonmalignant disorders transplanted between November 2001 and January 2008 at 29 US and 17 international centers using PDR CB units from two CB banks. RESULTS Transplant characteristics were as follows: median age, 3.5 years (range, 0.1-14 years); median patient weight, 15 kg (range, 4-61 kg); 58% male; HLA matches (intermediate-resolution HLA-A and HLA-B and high-resolution HLA-DRB1) of the units used in these patients six of six in 26, five of six in 48, four of six in 47, and three of six or two of six in 6; median prefreeze total nucleated cell dose, 10.5×10(7)/kg; median prefreeze CD34+ dose, 3.7×10(5)/kg; and nonmyeloablative regimen in 24%. The median times to myeloid and platelet engraftment were 21 and 49 days, respectively. The cumulative incidence of reported Grade II to IV acute graft-versus-host disease (aGVHD) was 38±5%, and 19±4% had Grade III to IV aGVHD. The Kaplan-Meier estimates of 3-year transplant-related mortality, overall survival, and disease-free survival were 20±4, 79±4, and 70±6%, respectively. CONCLUSION These data demonstrate the effectiveness of PDR CB units for HCT.
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Affiliation(s)
- Lawrence Petz
- StemCyte International Cord Blood Center, Covina, California 91722, USA
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Abstract
Two new resorcinols, 1-(5-acetyl-2,4-dihydroxyphenyl)-3-methylbutan-1-one (1) and 1-(5-acetyl-2-hydroxy-4-methoxyphenyl)-3-methylbutan-1-one (2), have been isolated from the brown algae Sargassum thunbergii (Mert.) O'Kuntze. Their structures were elucidated on the basis of spectroscopic methods.
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Affiliation(s)
- Yang-Peng Cai
- College of Food Science and Technology, Ocean University of China, Qingdao, China
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18
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Newton MG, Campana CF, Chi GC, Lee D, Liu ZJ, Nair V, Phillips J, Rose JP, Wang BC. A non-natural dinucleotide containing an isomeric L-related deoxynucleoside: dinucleotide inhibitors of anti-HIV integrase activity. Acta Crystallogr C 2005; 61:o518-20. [PMID: 16082106 DOI: 10.1107/s0108270105019037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2005] [Accepted: 06/15/2005] [Indexed: 11/10/2022] Open
Abstract
The first X-ray crystal structure of a non-natural dinucleotide, 5'-O-phosphoryl-1'-deoxy-2'-isoadenylyl-(3' --> 5')-cytidine 6.5-hydrate (pIsodApC), C19H26N8O13P2 x 6.5H2O, belonging to a family of dinucleotides that contain an isomeric nucleoside component, is described. A complex system of hydrogen bonds between water molecules and various sites on the dinucleotide was found. All H atoms were located from electron-density difference maps, which allowed identification of protonation sites. Compounds of this family have been found to bind at the active site of HIV integrase and to be inhibitors of this key viral enzyme. These dinucleotides are completely resistant to cleavage by exonucleases; an abnormal dihedral angle twist in an internucleotide phosphate bond revealed in the X-ray crystal structure may be contributing to this unusual stability towards nucleases.
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Affiliation(s)
- M Gary Newton
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA.
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Abstract
A modified neurophysin, des 1-6 bovine neurophysin II, has been crystallized in the absence of bound hormone or hormone analogue. These crystals represent the first crystals of ligand-free neurophysin, and are essential for understanding neurophysin-hormone recognition as well as hormone-induced neurophysin dimerization. The crystals diffract to beyond 1.8 A resolution, belong to space group P3(1)21 (or P3(2)21) with a = 48.86, c = 78.61 A, and contain one molecule per asymmetric unit.
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Affiliation(s)
- C K Wu
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens 30602, USA
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Yang YH, Wang BC, Wang QH, Xiang LJ, Duan CR. Research on solid-state fermentation on rice chaff with a microbial consortium. Colloids Surf B Biointerfaces 2004; 34:1-6. [PMID: 15261084 DOI: 10.1016/j.colsurfb.2003.10.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2003] [Accepted: 10/02/2003] [Indexed: 10/26/2022]
Abstract
A microbial consortium of Trichoderma reesei AS3.3711, Aspergillus niger 3.316 and Saccharomyces cerevisiaes AS2.399 was constructed to decomposed rice chaff on the basis of the characters of each microorganism and the mechanism of cellulases. In this experiment, rice chaff was pretreated before fermentation with NaOH so that the lignin structure of rice chaff was degraded and hemicellulose was dissolved partly, which remove the protection of lignin and hemicellulose on cellulose and demolish its special crystal structure. After pretreatment, rice chaff can be degraded more easily with the microbial consortium. The optimal technical paths and technological methods were achieved for intenerating rice chaff with the microbial consortium perfectly through orthogonal experiment. According to the technological methods, some experiments were done at 30 degrees C with pH 4.5. It was found that the highest filter paper enzyme activity (FPA) was 5.64 U/g and the ratio of cellulose degradation (RCD) was 28.05%.
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Affiliation(s)
- Y H Yang
- State Key Laboratory of Biomechanics and Tissue Engineering, Institute of Bioengineering, Chongqing University, Chongqing 400044, China
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Gao H, Wang Q, Wang BQ, Yan CH, Wang SF, Wang BC, Zhu J, Huang CB, Fu SB, Li P. [Genescan analysis of the loss of heterozygosity on the long arm of chromosome 6 in non-small cell lung cancer]. YI CHUAN XUE BAO = ACTA GENETICA SINICA 2002; 28:903-10. [PMID: 11695261] [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: 02/22/2023]
Abstract
To investigate if there are microsatellite loci in the long arm of chromosome 6 that have close relationship with non-small cell lung cancer, Multiple PCR approach was used to analyze the 36 loci in the long arm of chromosome 6. The PCR products were analyzed in PAGE and then the electrophoresis maps were analyzed with Genescan and Genotyper. There is different LOH frequency in different loci. The total frequency of LOH in 41 lung cancers was 78%(32/41), with the highest frequency of LOH was detected on the locus D6S302(75%). There are 14 loci which have LOH frequency more than 20% and the loci are mainly located in 2 regions: 6q16.3-q21 [6 loci D6S458 (21.43%), D6S1694 (26.92%), D6S1717 (35.71%), D6S1565 (40%), D6S302 (75%), D6S1706 (36.36%) and 6q26-q27 (5 loci D6S1550 (38.46%), D6S264 (20%), D6S1585 (25%), D6S446 (33.33%), D6S281 (30.77%)], There may be tumor suppressor genes located in the two regions, which have a close relationship with non-small cell lung cancer.
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Affiliation(s)
- H Gao
- Lab of Medical Genetics, Harbin Medical University, Harbin 150086, China
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Farmer CS, Kurtz DM, Liu ZJ, Wang BC, Rose J, Ai J, Sanders-Loehr J. The crystal structures of Phascolopsis gouldii wild type and L98Y methemerythrins: structural and functional alterations of the O2 binding pocket. J Biol Inorg Chem 2001; 6:418-29. [PMID: 11372200 DOI: 10.1007/s007750100218] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 10/27/2022]
Abstract
Reported are the X-ray crystal structures of recombinant Phascolopsis gouldii methemerythrin (1.8-A resolution) and the structure of an O2-binding-pocket mutant, L98Y methemerythrin (2.1-A resolution). The L98Y hemerythrin (Hr) has a greatly enhanced O2 affinity, a slower O2 dissociation rate, a larger solvent deuterium isotope effect on this rate, and a greater resistance to autoxidation relative to the wild-type protein. The crystal structures show that the hydrophobic binding pocket of Hr can accommodate substitution of a leucyl by a tyrosyl side chain with relatively minor structural rearrangements. UV/vis and resonance Raman spectra show that in solution L98Y methemerythrin contains a mixture of two diiron site structures differing by the absence or presence of an Fe(III)-coordinated phenolate. However, in the crystal, only one L98Y diiron site structure is seen, in which the Y98 hydroxyl is not a ligand, but instead forms a hydrogen bond to a terminal hydroxo/aqua ligand to the nearest iron. Based on this crystal structure, we propose that in the oxy form of L98Y hemerythrin the non-polar nature of the binding pocket favors localization of the Y98 hydroxyl near the O2 binding site, where it can donate a hydrogen bond to the hydroperoxo ligand. The stabilizing Y98OH-O2H-interaction would account for all of the altered O2 binding properties of L98Y Hr listed above.
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Affiliation(s)
- C S Farmer
- Department of Chemistry and Center for Metalloenzyme Studies, University of Georgia, Athens, GA 30602-2556, USA
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Vysotski ES, Liu ZJ, Rose J, Wang BC, Lee J. Preparation and X-ray crystallographic analysis of recombinant obelin crystals diffracting to beyond 1.1 A. Acta Crystallogr D Biol Crystallogr 2001; 57:1919-21. [PMID: 11717517 DOI: 10.1107/s0907444901016523] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2001] [Accepted: 10/04/2001] [Indexed: 11/10/2022]
Abstract
Crystals of recombinant obelin, the Ca(2+)-regulated photoprotein from the marine hydroid Obelia longissima, have been grown from a solution containing PEG 8000 and potassium phosphate. Hexaminecobalt trichloride was used as an additive to increase the chance of crystallization. The crystals grow in a light yellow cubic form (0.5 x 0.5 x 0.45 mm) which diffracts to beyond 1.1 A resolution. The crystals belong to the space group C2, with unit-cell parameters a = 83.43, b = 54.92, c = 52.99 A, beta = 112.00 degrees. The asymmetric unit contains one molecule. Crystals exposed to calcium ion before and after X-ray irradiation emit light, confirming that the crystals consist of an active photoprotein.
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Affiliation(s)
- E S Vysotski
- Photobiology Laboratory, Institute of Biophysics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russia
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24
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Lei ZB, Li XY, Wang BC, Yang YF, You NZ, Sun J. Regulation of growth-regulated oncogene alpha expression by estrogen in human endothelial cells. Acta Pharmacol Sin 2001; 22:1003-6. [PMID: 11749791] [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: 02/23/2023] Open
Abstract
AIM To study the effect of estrogen on expression of growth-regulated oncogene alpha (GROalpha) in human umbilical vein endothelial cells (HUVEC) in vitro. METHODS Expressions of CXC chemokine GROalpha mRNA and protein were measured by Northern blotting assay and ELISA, respectively. The physiological significance of GROalpha expression was tested by static cell adhesion assay. RESULTS Both the GROalpha mRNA and protein levels decreased markedly after HUVEC were exposured to 17beta-estradiol (2 0.05 micromol/L. Moreover, the inhibition of the protein was depended on the concentration of 17beta-estradiol. Tamoxifen (0.1 micromol/L), an estrogen receptor alpha antagonist, alone did not affect GROalpha protein expression, but can reverse the E2 -induced inhibition of GROalpha protein expression (by up to 50 %) and the binding of U937 cells to E2-treated HUVEC (by up to 40 %). CONCLUSION Estrogen might functionally down-regulates GROalpha expression through estrogen receptor alpha on endothelial cells.
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Affiliation(s)
- Z B Lei
- Department of Cardiology, General Hospital of Jinan Military Region, Jinan 250031, China.
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25
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Schubot FD, Kataeva IA, Blum DL, Shah AK, Ljungdahl LG, Rose JP, Wang BC. Structural basis for the substrate specificity of the feruloyl esterase domain of the cellulosomal xylanase Z from Clostridium thermocellum. Biochemistry 2001; 40:12524-32. [PMID: 11601976 DOI: 10.1021/bi011391c] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [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: 11/28/2022]
Abstract
Feruloyl esterases function in the cleavage of ferulic acid's bonds to arabinoxylan and pectin where the ferulic acid moieties cross-link the layers of polysaccharide chains within hemicellulose. This work presents the crystal structure of FAE_XynZ, the domain of Clostridium thermocellum's cellulosomal xylanase Z that displays feruloyl esterase activity. The structure was obtained via multiple isomorphous replacement with anomalous scattering (MIRAS) using three heavy atom derivatives and refined against X-ray diffraction data of up to 1.75 A resolution. The R-value of the final model was 0.187 (R(free) = 0.21). FAE_XynZ displays an eight-stranded alpha/beta-fold with the characteristic "catalytic triad" at the heart of the active site. To define the substrate specificity determinants of the enzyme, the crystal structures of FAE_XynZ and the inactive FAE_XynZ(S172A) mutant were determined in complexes with the feruloyl-arabinoxylans FAXX and FAX(3), respectively. In the complex crystals, the ferulic acid moieties are clearly recognizable and allowed identification of the hydrophobic binding pocket. The carbohydrate part of both substrates is not visible in either structure. The location of the putative carbohydrate binding-pocket was inferred based on the location and orientation of the adjacent ferulic acid molecule. Five of the six residues lining the pocket were found to be conserved in FAE A from Orpinomyces sp., which further supports the proposed role of these amino acids.
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Affiliation(s)
- F D Schubot
- Department of Biochemistry & Molecular Biology, The University of Georgia, Athens, Georgia 30602, USA
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26
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Deng L, Vysotski ES, Liu ZJ, Markova SV, Malikova NP, Lee J, Rose J, Wang BC. Structural basis for the emission of violet bioluminescence from a W92F obelin mutant. FEBS Lett 2001; 506:281-5. [PMID: 11602262 DOI: 10.1016/s0014-5793(01)02937-4] [Citation(s) in RCA: 41] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mutation of the Trp92 that is known to lie within the active site of the photoprotein obelin from Obelia longissima, results in a shift of the bioluminescence color from blue (lambda(max)=485 nm) to violet. The corrected spectrum shows a new band with lambda(max)=410 nm now contributing equally to the one at longer wavelength. The crystal structure of this W92F obelin determined at 1.72 A resolution shows that there is no significant change in the dimensions of the active site between WT obelin (recombinant Ca2+-regulated photoprotein from Obelia longissima) and the mutant. It is proposed that the bioluminescence spectral shift results from removal of a hydrogen bond from the indole of W92 nearby a hydroxyl belonging to the 6-phenyl substituent of the substrate coelenterazine. Propagation of this change through a conjugated bond system in the excited state of the product coelenteramide affects the coupling of the N1-position and the hydrogen-bonded Y138.
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Affiliation(s)
- L Deng
- Department of Chemistry, University of Georgia, Athens 30602, USA.
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27
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Schubot FD, Chen CJ, Rose JP, Dailey TA, Dailey HA, Wang BC. Crystal structure of the transcription factor sc-mtTFB offers insights into mitochondrial transcription. Protein Sci 2001; 10:1980-8. [PMID: 11567089 PMCID: PMC2374216 DOI: 10.1110/ps.11201] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.4] [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: 10/17/2022]
Abstract
Although it is commonly accepted that binding of mitochondrial transcription factor sc-mtTFB to the mitochondrial RNA polymerase is required for specific transcription initiation in Saccharomyces cerevisiae, its precise role has remained undefined. In the present work, the crystal structure of sc-mtTFB has been determined to 2.6 A resolution. The protein consists of two domains, an N-terminal alpha/beta-domain and a smaller domain made up of four alpha-helices. Contrary to previous predictions, sc-mtTFB does not resemble Escherichia coli sigma-factors but rather is structurally homologous to rRNA methyltransferase ErmC'. This suggests that sc-mtTFB functions as an RNA-binding protein, an observation standing in contradiction to the existing model, which proposed a direct interaction of sc-mtTFB with the mitochondrial DNA promoter. Based on the structure, we propose that the promoter specificity region is located on the mitochondrial RNA polymerase and that binding of sc-mtTFB indirectly mediates interaction of the core enzyme with the promoter site.
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Affiliation(s)
- F D Schubot
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
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28
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Meng H, Bao Z, Lovinger AJ, Wang BC, Mujsce AM. High field-effect mobility oligofluorene derivatives with high environmental stability. J Am Chem Soc 2001; 123:9214-5. [PMID: 11552851 DOI: 10.1021/ja016525o] [Citation(s) in RCA: 189] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H Meng
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
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29
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Wu CK, Hu B, Rose JP, Liu ZJ, Nguyen TL, Zheng C, Breslow E, Wang BC. Structures of an unliganded neurophysin and its vasopressin complex: implications for binding and allosteric mechanisms. Protein Sci 2001; 10:1869-80. [PMID: 11514677 PMCID: PMC2253203 DOI: 10.1110/ps.10601] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The structures of des 1-6 bovine neurophysin-II in the unliganded state and as its complex with lysine vasopressin were determined crystallographically at resolutions of 2.4 A and 2.3 A, respectively. The structure of the protein component of the vasopressin complex was, with some local differences, similar to that determined earlier of the full-length protein complexed with oxytocin, but relatively large differences, probably intrinsic to the hormones, were observed between the structures of bound oxytocin and bound vasopressin at Gln 4. The structure of the unliganded protein is the first structure of an unliganded neurophysin. Comparison with the liganded state indicated significant binding-induced conformational changes that were the largest in the loop region comprising residues 50-58 and in the 7-10 region. A subtle binding-induced tightening of the subunit interface of the dimer also was shown, consistent with a role for interface changes in neurophysin allosteric mechanism, but one that is probably not predominant. Interface changes are suggested to be communicated from the binding site through the strands of beta-sheet that connect these two regions, in part with mediation by Gly 23. Comparison of unliganded and liganded states additionally reveals that the binding site for the hormone alpha-amino group is largely preformed and accessible in the unliganded state, suggesting that it represents the initial site of hormone protein recognition. The potential molecular basis for its thermodynamic contribution to binding is discussed.
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Affiliation(s)
- C K Wu
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
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30
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Lee TM, Wang BC, Yang YC, Chang E, Yang CY. Comparison of plasma-sprayed hydroxyapatite coatings and hydroxyapatite/tricalcium phosphate composite coatings: in vivo study. J Biomed Mater Res 2001; 55:360-7. [PMID: 11255189 DOI: 10.1002/1097-4636(20010605)55:3<360::aid-jbm1040>3.0.co;2-q] [Citation(s) in RCA: 39] [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] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study aimed to compare biological properties, including osteoconduction, osseointegration, and shear strength, between plasma-sprayed hydroxyapatite (HA) and HA/tricalcium phosphate (TCP) coatings, using a transcortical implant model in the femora of canines. After 3 and 12 weeks of implantation, the implants with surrounding bone were assessed histologically in undecalcified sections in backscattered electron images (BEIs) under a scanning electron microscope (SEM). After short-term (3 week) follow-up, both coatings conducted new bone formation and revealed direct bone-to-coating contact. The HA/TCP coating could not enhance early host-to-coating responses. At 12 weeks, serious dissolution of the HA/TCP coatings evidently occurred. By the new bone healing index (NBHI) and apposition index (AI), we found no significant difference between HA/TCP-coated implants and HA-coated implants throughout all implant periods. At 12 weeks of implantation, some particles dissociated from the HA/TCP coating were found within the remodeling canal. After push-out measurements, the shear strength and failure mode of HA/TCP-coated implants were similar to those of HA-coated implants, and no statistical differences were found between either coating. Consequently, this study indicates that HA/TCP coatings have excellent biological response and may be considered suitable bioactive ceramic coatings for short-term clinical use.
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Affiliation(s)
- T M Lee
- Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.
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31
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Dong Y, Wang BC, Zhang YX. [Clinical and experimental study on treatment of infantile mycotic enteritis by jiechang mixture]. Zhongguo Zhong Xi Yi Jie He Za Zhi 2001; 21:419-21. [PMID: 12577434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To evaluate the therapeutic effect and mechanism of Jiechang Mixture (JCM) in treating infantile mycotic enteritis. METHODS The children patients confirmed to be suffered from mycotic enteritis were divided randomly into two groups: the 40 cases in the treated group treated with JCM and the 20 cases in the control group treated with fungicidin. The time of stool forming, diarrhea relieving and fungi vanishing were observed. The promoting effect of JCM on small intestine motility and the inhibition of JCM on Candida albicans in stool culture were studied experimentally. RESULTS The time of stool forming, diarrhea relieving and fungi vanishing in the treated group were significantly shorter than those in the control group (P < 0.01), and JCM also showed a better effect in improving clinical symptoms and signs of patients than the control. Results of experimental study showed that JCM could abate the ink evacuation of small intestine in mice. The fungi inhibitory test suggested that Candida albicans was susceptible to JCM. CONCLUSION JCM is an effective herbal medicine in treating infantile mycotic enteritis.
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Affiliation(s)
- Y Dong
- Ningbo Municipal Hospital of TCM, Zhejiang 315010
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32
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Hempel J, Kuo I, Perozich J, Wang BC, Lindahl R, Nicholas H. Aldehyde dehydrogenase. Maintaining critical active site geometry at motif 8 in the class 3 enzyme. Eur J Biochem 2001; 268:722-6. [PMID: 11168411 DOI: 10.1046/j.1432-1327.2001.01926.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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Alignment of all known, diverse members of the aldehyde dehydrogenase (ALDH) extended family revealed only two strictly conserved, nonglycine residues, a glutamate and a phenylalanine residue. Both occur in one of the highly conserved 'motif' segments and both occupy strategic locations in the tertiary structure at the bottom of the catalytic funnel. In class 3 ALDH, these are Glu333 and Phe335. In addition, Asp247, which is not highly conserved but is characteristic of class 3 ALDHs, hydrogen bonds the main chain between Glu333 and Phe335. These three residues were mutated conservatively. Michaelis constants determined for both NAD/propanal and NADP/benzaldehyde substrate pairs show all three residues to be crucial to effective catalysis, and suggest that the hydrogen bond to Asp247 is a key element in maintaining precise geometry of key elements at the active site.
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Affiliation(s)
- J Hempel
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh 15620, USA.
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33
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Wu CK, Dailey HA, Rose JP, Burden A, Sellers VM, Wang BC. The 2.0 A structure of human ferrochelatase, the terminal enzyme of heme biosynthesis. Nat Struct Biol 2001; 8:156-60. [PMID: 11175906 DOI: 10.1038/84152] [Citation(s) in RCA: 184] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Human ferrochelatase (E.C. 4.99.1.1) is a homodimeric (86 kDa) mitochondrial membrane-associated enzyme that catalyzes the insertion of ferrous iron into protoporphyrin to form heme. We have determined the 2.0 A structure from the single wavelength iron anomalous scattering signal. The enzyme contains two NO-sensitive and uniquely coordinated [2Fe-2S] clusters. Its membrane association is mediated in part by a 12-residue hydrophobic lip that also forms the entrance to the active site pocket. The positioning of highly conserved residues in the active site in conjunction with previous biochemical studies support a catalytic model that may have significance in explaining the enzymatic defects that lead to the human inherited disease erythropoietic protoporphyria.
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Affiliation(s)
- C K Wu
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602-7229, USA
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34
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Dailey HA, Dailey TA, Wu CK, Medlock AE, Wang KF, Rose JP, Wang BC. Ferrochelatase at the millennium: structures, mechanisms and [2Fe-2S] clusters. Cell Mol Life Sci 2000; 57:1909-26. [PMID: 11215517 DOI: 10.1007/pl00000672] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.6] [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: 12/29/2022]
Abstract
Ferrochelatase (E.C. 4.99.1.1, protoheme ferrolyase) catalyzes the insertion of ferrous iron into protoporphyrin IX to form protoheme (heme). In the past 2 years, the crystal structures of ferrochelatases from the bacterium Bacillus subtilis and human have been determined. These structures along with years of biophysical and kinetic studies have led to a better understanding of the catalytic mechanism of ferrochelatase. At present, the complete DNA sequences of 45 ferrochelatases from procaryotes and eucaryotes are available. These sequences along with direct protein studies reveal that ferrochelatases, while related, vary significantly in amino acid sequence, molecular size, subunit composition, solubility, and the presence or absence of nitric-oxide-sensitive [2Fe-2S] cluster.
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Affiliation(s)
- H A Dailey
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens 30605-7229, USA.
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35
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Liu ZJ, Vysotski ES, Chen CJ, Rose JP, Lee J, Wang BC. Structure of the Ca2+-regulated photoprotein obelin at 1.7 A resolution determined directly from its sulfur substructure. Protein Sci 2000; 9:2085-93. [PMID: 11152120 PMCID: PMC2144499 DOI: 10.1110/ps.9.11.2085] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The crystal structure of the photoprotein obelin (22.2 kDa) from Obelia longissima has been determined and refined to 1.7 A resolution. Contrary to the prediction of a peroxide, the noncovalently bound substrate, coelenterazine, has only a single oxygen atom bound at the C2-position. The protein-coelenterazine 2-oxy complex observed in the crystals is photo-active because, in the presence of calcium ion, bioluminescence emission within the crystal is observed. This structure represents only the second de novo protein structure determined using the anomalous scattering signal of the sulfur substructure in the crystal. The method used here is theoretically different from that used for crambin in 1981 (4.72 kDa) and represents a significant advancement in protein crystal structure determination.
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Affiliation(s)
- Z J Liu
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens 30602, USA
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36
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Abstract
Among pyridine-nucleotide-dependent oxidoreductases, the class 3 family of aldehyde dehydrogenases (ALDHs) is unusual in its ability to function with either NAD or NADP. This is all the more surprising because an acidic residue, Glu140, coordinates the adenine ribose 2' hydroxyl. In many NAD-dependent dehydrogenases a similarly placed carboxylate is thought to be responsible for exclusion of NADP. The corresponding residue in most (approximately 71%) sequences in the ALDH extended family is also Glu, and most of these are NAD-specific enzymes. Site-directed mutagenesis was performed on this residue in rat class 3 ALDH. Our results indicate that this residue contributes to tighter binding of NAD in the native enzyme, but suggest that additional factors must contribute to the ability to utilize NADP. Mutagenesis of an adjacent basic residue (Lys137) indicates that it is even more essential for binding both coenzymes, consistent with its conservation in nearly all ALDHs (> 98%).
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Affiliation(s)
- J Perozich
- Department of Biological Sciences, University of Pittsburgh, PA, USA; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, USA
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Abstract
The recent National Research Council report, Future Biotechnology Research on the International Space Station, evaluates NASA's plans for research in cell science and protein crystal growth to be conducted on the International Space Station. This report concludes that the NASA biotechnology programs have the potential to significantly impact relevant scientific fields and to increase understanding and insight into fundamental biological issues. In order to realize the potential impacts, NASA must focus its research programs by selecting specific questions related to gravitational forces' role in cell behavior and by using the microgravity environment as a tool to determine the structure of macromolecules with important biological implications. Given the time and volume constraints associated with space-based experiments, instrumentation to be used on the space station must be designed to maximize the productivity of researchers, and NASA's recruitment of investigators and support for space station experiments should aim to encourage and facilitate cutting-edge research.
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Affiliation(s)
- P B Sigler
- Yale University, New Haven, Connecticut 06520, USA
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38
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Blum DL, Schubot FD, Ljungdahl LG, Rose JP, Wang BC. Crystallization and preliminary X-ray analysis of the Clostridium thermocellum cellulosome xylanase Z feruloyl esterase domain. Acta Crystallogr D Biol Crystallogr 2000; 56:1027-9. [PMID: 10944344 DOI: 10.1107/s0907444900006521] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/1999] [Accepted: 05/05/2000] [Indexed: 11/11/2022]
Abstract
Feruloyl esterases cleave ferulic acid from arabinoxylan and pectin. Feruloyl groups are believed to crosslink the polysaccharide chain within the polymer and to link hemicellulose to lignin, which may play a role in controlling the growth of plants. The Clostridium thermocellum cellulosome xylanase Z feruloyl esterase was expressed in Escherichia coli, purified and crystallized. The crystals diffract to 2.4 A resolution and belong to the orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 43.14, b = 63.77, c = 79.57 A. Assuming one molecule per asymmetric unit, the Matthews coefficient is calculated to be 1.87 A(3) Da(-1), which corresponds to a solvent content of 34%.
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Affiliation(s)
- D L Blum
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
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39
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Schubot FD, Chen CJ, Rose JP, Wang BC. Crystallization and preliminary X-ray diffraction analysis of the mitochondrial transcription factor sc-mtTFB from Saccharomyces cerevisiae. Acta Crystallogr D Biol Crystallogr 2000; 56:902-3. [PMID: 10930839 DOI: 10.1107/s0907444900005060] [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] [Received: 11/23/1999] [Accepted: 04/03/2000] [Indexed: 11/10/2022]
Abstract
Eukaryotic mitochondria contain a distinct mini-chromosome. In yeast, transcription of the mitochondrial genome is mediated by a nuclear-encoded RNA polymerase consisting of a single polypeptide core enzyme and a specificity factor termed sc-mtTFB which bears some similarity to bacterial sigma-factors. sc-mtTFB from Saccharomyces cerevisiae has been cloned, expressed, purified and crystallized. The crystals belong to the monoclinic space group C2, with unit-cell parameters a = 89.7, b = 44.6, c = 98.9 A, beta = 110 degrees. Based on one molecule per asymmetric unit, the solvent content is estimated to be 48%. Small crystals of dimensions 0.01 x 0.05 x 0.13 mm diffract to at least 2.7 A resolution on a rotating-anode X-ray source.
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Affiliation(s)
- F D Schubot
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
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40
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Hu MY, Zhou XQ, Wang BC. [Determination of ibandronate by high performance ion exchange chromatography]. Se Pu 2000; 18:254-5. [PMID: 12541567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
A method for the determination of Ibandronate by high performance ion exchange chromatography is reported. Ibandronate can form a complex compound with the copper ion added in the mobile phase. The complex can be detected at UV 240 nm. The effects of pH of mobile phase and concentration of methanol to the retention time were studied. Concentration of 10% methanol and pH 2.5 were suitable for the detection in less than 5 min. The flow rate was 1.0 mL/min. The relative standard deviation of peak area was 0.8%. The linear correlation was observed from 300 mg/L to 1,500 mg/L of Ibandronate (r = 0.9989). The lowest detectable concentration of Ibandronate was 6 mg/L. The method is simple, rapid and reproducible.
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Affiliation(s)
- M Y Hu
- National Laboratory of Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
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41
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Vysotski ES, Liu ZJ, Rose J, Wang BC, Lee J. Preparation and preliminary study of crystals of the recombinant calcium-regulated photoprotein obelin from the bioluminescent hydroid Obelia longissima. Acta Crystallogr D Biol Crystallogr 1999; 55:1965-6. [PMID: 10531510 DOI: 10.1107/s0907444999011828] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Crystals of recombinant obelin, the Ca(2+)-regulated photoprotein from the marine hydroid Obelia longissima, have been grown from sodium citrate solutions. Crystals grow as hexagonal light-yellow rods (0.1 x 0.1 x 1.0 mm) which diffract to beyond 1.8 A with synchrotron radiation of 1.0 A wavelength. The crystals have a primitive hexagonal lattice with unit-cell parameters a = 81.55, c = 86.95 A. The asymmetric unit contains two molecules. This represents the successful preparation of single crystals of a photoprotein obelin which have promising diffraction properties.
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Affiliation(s)
- E S Vysotski
- Photobiology Laboratory, Institute of Biophysics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russia
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42
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Hempel J, Perozich J, Chapman T, Rose J, Boesch JS, Liu ZJ, Lindahl R, Wang BC. Aldehyde dehydrogenase catalytic mechanism. A proposal. Adv Exp Med Biol 1999; 463:53-9. [PMID: 10352669 DOI: 10.1007/978-1-4615-4735-8_7] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- J Hempel
- Department of Biological Sciences, University of Pittsburgh, Pennsylvania 15260, USA
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Chen CJ, Liu ZJ, Rose JP, Wang BC. Low-salt crystallization of T7 RNA polymerase: a first step towards the transcription bubble complex. Acta Crystallogr D Biol Crystallogr 1999; 55:1188-92. [PMID: 10329782 DOI: 10.1107/s0907444999004400] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
DNA-dependent RNA polymerase is the key enzyme responsible for the biosynthesis of RNA, a process known as transcription. This process, which decodes the genetic information from DNA, is one of the most significant events in a biological system. The crystallization of both native and a chimeric T7/T3 RNAP using high salt conditions has been reported previously but these conditions proved unsuitable for DNA-RNAP complex formation since at high salt concentrations the DNA binding affinity to RNAP is reduced. A search for low-salt crystallization conditions has yielded new low-salt crystals of native T7-RNAP, a chimeric T7-RNAP (T7/T3 RNAP) which contains the T3 promoter recognition sequence, and a T7-RNAP containing an N-terminal histidine tag. The crystals, which are better suited for DNA-RNAP complex formation, belong to space group P3121 with a = 136, c = 156 A, contain a single molecule per asymmetric unit and diffract to 2.7 A resolution. Packing analysis shows that the new low-salt crystals have packing contacts similar to those observed in the high-salt T7-RNAP crystals reported previously. The diffraction anisotropicity observed in crystals of T7 RNAP is explained in term of crystal packing.
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Affiliation(s)
- C J Chen
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
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Wang KF, Wu CK, Sellers VM, Rose JP, Wang BC, Dailey HA. Purification, crystallization and preliminary X-ray analysis of Drosophila melanogaster ferrochelatase. Acta Crystallogr D Biol Crystallogr 1999; 55:1201-3. [PMID: 10329785 DOI: 10.1107/s0907444999003595] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Ferrochelatase (protoheme ferrolyase, E.C. 4.99.1.1), the terminal enzyme in the heme biosynthetic pathway, catalyzes the insertion of ferrous iron into protoporphyrin IX to form protoheme. In eukaryotes, the protein is associated with the inner surface of the inner mitochondrial membrane, and in higher animals the enzyme contains a [2Fe-2S] cluster. This cluster is highly sensitive to NO and is coordinated by four Cys residues whose spacing in the primary sequence is unique. Ferrochelatase from Drosophila melanogaster has been expressed in Escherichia coli with an amino-terminal six-histidine tag and purified to homogeneity. The protein has been crystallized with the [2Fe-2S] cluster intact. The crystals belong to space group I422, with unit-cell dimensions a = b = 158.1, c = 171.2 A and two molecules in the asymmetric unit, and diffract to 3. 0 A resolution.
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Affiliation(s)
- K F Wang
- Department of Microbiology, Center for Metalloenzyme Studies, University of Georgia, Athens, GA 30602-7229, USA
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Breslow E, Mombouyran V, Deeb R, Zheng C, Rose JP, Wang BC, Haschemeyer RH. Structural basis of neurophysin hormone specificity: Geometry, polarity, and polarizability in aromatic ring interactions. Protein Sci 1999; 8:820-31. [PMID: 10211828 PMCID: PMC2144317 DOI: 10.1110/ps.8.4.820] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The structural origins of the specificity of the neurophysin hormone-binding site for an aromatic residue in peptide position 2 were explored by analyzing the binding of a series of peptides in the context of the crystal structure of liganded neurophysin. A new modeling method for describing the van der Waals surface of binding sites assisted in the analysis. Particular attention was paid to the unusually large (5 kcal/mol) difference in binding free energy between Phe and Leu in position 2, a value representing more than three times the maximum expected based on hydrophobicity alone, and additionally remarkable since modeling indicated that the Leu side chain was readily accommodated by the binding pocket. Although evidence was obtained of a weak thermodynamic linkage between the binding interactions of the residue 2 side chain and of the peptide alpha-amino group, two factors are considered central. (1) The bound Leu side chain can establish only one-third of the van der Waals contacts available to a Phe side chain. (2) The bound Phe side chain appears to be additionally stabilized relative to Leu by more favorable dipole and induced dipole interactions with nonaromatic polar and sulfur ligands in the binding pocket, as evidenced by examination of its interactions in the pocket, analysis of the detailed energetics of transfer of Phe and Leu side chains from water to other phases, and comparison with thermodynamic and structural data for the binding of residue 1 side chains in this system. While such polar interactions of aromatic rings have been previously observed, the present results suggest their potential for significant thermodynamic contributions to protein structure and ligand recognition.
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Affiliation(s)
- E Breslow
- Department of Biochemistry, Weill Medical College of Cornell University, New York, New York 10021, USA.
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Fang P, Wang BC, Wu CY, Wan WX, Jiang NY, Zhou X, Chen ZP. Pharmacology study of the neutral myocardial imaging agent technetium-99m-N(NOEt)2. J Nucl Med Technol 1999; 27:54-6. [PMID: 10322579] [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: 02/12/2023] Open
Abstract
OBJECTIVE The biological properties of a new neutral myocardial imaging agent 99mTcN(NOEt)2 were evaluated. METHODS Blood clearance in rabbits, biodistribution in rats, and initial myocardial imaging in dogs were performed. RESULTS Radiochemical purity of 99mTcN(NOEt)2 was more than 90% and stable for 6 h at room temperature. Blood disappearance was analyzed with a biexponential model and T1/2(alpha) = 2.53 min, T1/2(beta) = 330 min and CI = 378 ml/h were obtained. Biodistribution studies demonstrated that 99mTcN(NOEt)2 localized selectively in the rat myocardium. Cardiac uptakes were 4.69, 4.20, 3.95 and 3.43% ID/g at 5, 30, 60 and 90 min postinjection, respectively. The mean heart-to-lung activity ratios were 1.69, 2.40 and 2.55 at 10 min, 30 min and 60 min postinjection, respectively. CONCLUSION Technetium-99m-N(NOEt)2 exhibited favorable stability and biological properties. Further study in humans is required.
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Affiliation(s)
- P Fang
- State Key Laboratory of Nuclear Medicine, Jiangsu, Peoples Republic of China
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Liu J, Guo X, Wang BC, Jin GZ. Increased phosphorylation of DARPP-32 by D1 agonistic action of l-stepholidine in the 6-OHDA-lesioned rat striatum. Sheng Li Xue Bao 1999; 51:65-72. [PMID: 11972178] [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
In order to explore the characteristics of l-stepholidine (SPD) activating the postsynaptic D(1) receptors, the effects of SPD on DARPP-32 phosphorylation in vivo with back-phosphorylation assay and on the postsynaptic D(1) receptor densities with radioligand assay were observed in the striatum of 6-OHDA-lesioned rat. The results showed that following subcutaneously administration of 20 or 40 mg/kg SPD for 21 d, (32)P phosphate incorporation into the DARPP-32 protein in the denervated striatum showed a 50% reduction (P<0.01) vs the intact striatum, indicating an increase of DARPP-32 phosphorylation in vivo in the denervated striatum. However,the D(1) receptor B(max) was decreased from 385.0+/-26.1 to 319.7+/-20.1 fmol/mg protein. It is suggested that D(1) agonist action of SPD decreases the D(1) receptor density but increases the phosphorylation of DARPP-32 in the striatum of 6-OHDA-lesioned rat, which may be responsible for the regulation of D(1) receptor signal transduction in brain neurons.
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Affiliation(s)
- J Liu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031
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Abstract
One hundred-forty-five full-length aldehyde dehydrogenase-related sequences were aligned to determine relationships within the aldehyde dehydrogenase (ALDH) extended family. The alignment reveals only four invariant residues: two glycines, a phenylalanine involved in NAD binding, and a glutamic acid that coordinates the nicotinamide ribose in certain E-NAD binary complex crystal structures, but which may also serve as a general base for the catalytic reaction. The cysteine that provides the catalytic thiol and its closest neighbor in space, an asparagine residue, are conserved in all ALDHs with demonstrated dehydrogenase activity. Sixteen residues are conserved in at least 95% of the sequences; 12 of these cluster into seven sequence motifs conserved in almost all ALDHs. These motifs cluster around the active site of the enzyme. Phylogenetic analysis of these ALDHs indicates at least 13 ALDH families, most of which have previously been identified but not grouped separately by alignment. ALDHs cluster into two main trunks of the phylogenetic tree. The largest, the "Class 3" trunk, contains mostly substrate-specific ALDH families, as well as the class 3 ALDH family itself. The other trunk, the "Class 1/2" trunk, contains mostly variable substrate ALDH families, including the class 1 and 2 ALDH families. Divergence of the substrate-specific ALDHs occurred earlier than the division between ALDHs with broad substrate specificities. A site on the World Wide Web has also been devoted to this alignment project.
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Affiliation(s)
- J Perozich
- Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pennsylvania 15261, USA
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Abstract
The hormonal precursor pro-ocytocin-neurophysin is activated by selective cleavage at Arg2-Ala13, producing mature ocytocin and neurophysin. To understand the cleavage mechanism better, and in particular the recognition of the cleavage site, it is necessary to characterize the three-dimensional structure of the precursor molecule. Here we combine a variety of experimental data with molecular modeling and dynamics calculations to derive possible precursor conformations. In the models obtained, the N-terminus of the precursor, corresponding to the ocytocin segment, is hydrogen bonded in a pocket of the neurophysin moiety in a similar manner to a crystallographically obtained non-covalent complex between the two molecules. The calculations suggest that although the ocytocin segment is relatively flexible, it adopts a stable, broad loop structure in the vicinity of the cleavage region, which may constitute the structural element recognized by the cleaving enzyme. The calculations also suggest a possible widening of the distance between the two neurophysin domains in the precursor relative to that in the non-covalent neurophysin-ocytocin complex.
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Affiliation(s)
- B Velikson
- Section de Biophysique des Protéines et Membranes, CEA/Saclay, Gif-sur-Yvette, France
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Sun YJ, Rose J, Wang BC, Hsiao CD. The structure of glutamine-binding protein complexed with glutamine at 1.94 A resolution: comparisons with other amino acid binding proteins. J Mol Biol 1998; 278:219-29. [PMID: 9571045 DOI: 10.1006/jmbi.1998.1675] [Citation(s) in RCA: 140] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The crystal structure of the glutamine-binding protein (GlnBP) complexed with its ligand (Gln) was determined and refined to 1.94 A resolution. This ellipsoidal protein has two globular domains and is approximately 52 Ax40 Ax35 A in size. The glutamine ligand is located in the cleft between the two domains and stablized by hydrogen bondings and ionic interactions with Asp10, Gly68, Thr70, Ala67, Asp157, Arg75, Lys115, Gly119 and His156. The aliphatic portion of the glutamine ligand is sandwiched in a hydrophobic pocket formed between Phe13 and Phe50 and has 21 van der Waals contacts with GlnBP. Lys115 and His156, that are unique to GlnBP among amino acid binding proteins, apparently contribute to the ligand binding specificity of GlnBP. Asp10 is within 3 A of Lys115. These two residues are over 10 A apart in the ligand-free form of the GlnBP. In addition, GlnBP-Gln exhibits a large-scale movement of the two hinges connecting the two globular domains upon ligand binding. The most significant changes are 41.1 degrees in the phi angle of Gly89 and 34.3 degrees in the psi angle of Glu181 from the first and the second hinge of the protein, respectively. Besides the original six hydrogen bonds, three extra hydrogen bonds can be observed between the two hinge strands upon ligand binding. A hydrogen bond network connects the large domain to the second hinge and a second hydrogen bond network coalesces the small domain to the same strand, both via interaction with the glutamine ligand. Although the two strands of the hinge connecting the domains do not directly participate in the ligand binding, Gln183 and Tyr185 from the second hinge may be involved in the cascade of the conformational change that is induced by ligand binding.
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Affiliation(s)
- Y J Sun
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan, 11529, Republic of China
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