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Xu F, Bian Y, Zhang GQ, Gao LY, Liu YF, Liu TX, Li G, Song RX, Su LJ, Zhou YJ, Cui JY, Yan XL, Guo FM, Zhang HY, Li QH, Zhao M, Ma LK, You BA, Wang G, Kong L, Ma JL, Zhou XF, Chang ZL, Tang ZY, Yu DY, Cheng K, Xue L, Li X, Pang JJ, Wang JL, Zhang HT, Yu XZ, Chen YG. [Safety and efficacy of the early administration of levosimendan in patients with acute non-ST-segment elevation myocardial infarction and elevated NT-proBNP levels: An Early Management Strategy of Acute Heart Failure (EMS-AHF)]. Zhonghua Nei Ke Za Zhi 2023; 62:374-383. [PMID: 37032132 DOI: 10.3760/cma.j.cn112138-20220420-00284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
Abstract
Objectives: To investigated the safety and efficacy of treating patients with acute non-ST-segment elevation myocardial infarction (NSTEMI) and elevated levels of N-terminal pro-hormone B-type natriuretic peptide (NT-proBNP) with levosimendan within 24 hours of first medical contact (FMC). Methods: This multicenter, open-label, block-randomized controlled trial (NCT03189901) investigated the safety and efficacy of levosimendan as an early management strategy of acute heart failure (EMS-AHF) for patients with NSTEMI and high NT-proBNP levels. This study included 255 patients with NSTEMI and elevated NT-proBNP levels, including 142 males and 113 females with a median age of 65 (58-70) years, and were admitted in the emergency or outpatient departments at 14 medical centers in China between October 2017 and October 2021. The patients were randomly divided into a levosimendan group (n=129) and a control group (n=126). The primary outcome measure was NT-proBNP levels on day 3 of treatment and changes in the NT-proBNP levels from baseline on day 5 after randomization. The secondary outcome measures included the proportion of patients with more than 30% reduction in NT-proBNP levels from baseline, major adverse cardiovascular events (MACE) during hospitalization and at 6 months after hospitalization, safety during the treatment, and health economics indices. The measurement data parameters between groups were compared using the t-test or the non-parametric test. The count data parameters were compared between groups using the χ² test. Results: On day 3, the NT-proBNP levels in the levosimendan group were lower than the control group but were statistically insignificant [866 (455, 1 960) vs. 1 118 (459, 2 417) ng/L, Z=-1.25,P=0.21]. However, on day 5, changes in the NT-proBNP levels from baseline in the levosimendan group were significantly higher than the control group [67.6% (33.8%,82.5%)vs.54.8% (7.3%,77.9%), Z=-2.14, P=0.03]. There were no significant differences in the proportion of patients with more than 30% reduction in the NT-proBNP levels on day 5 between the levosimendan and the control groups [77.5% (100/129) vs. 69.0% (87/126), χ²=2.34, P=0.13]. Furthermore, incidences of MACE did not show any significant differences between the two groups during hospitalization [4.7% (6/129) vs. 7.1% (9/126), χ²=0.72, P=0.40] and at 6 months [14.7% (19/129) vs. 12.7% (16/126), χ²=0.22, P=0.64]. Four cardiac deaths were reported in the control group during hospitalization [0 (0/129) vs. 3.2% (4/126), P=0.06]. However, 6-month survival rates were comparable between the two groups (log-rank test, P=0.18). Moreover, adverse events or serious adverse events such as shock, ventricular fibrillation, and ventricular tachycardia were not reported in both the groups during levosimendan treatment (days 0-1). The total cost of hospitalization [34 591.00(15 527.46,59 324.80) vs. 37 144.65(16 066.90,63 919.00)yuan, Z=-0.26, P=0.80] and the total length of hospitalization [9 (8, 12) vs. 10 (7, 13) days, Z=0.72, P=0.72] were lower for patients in the levosimendan group compared to those in the control group, but did not show statistically significant differences. Conclusions: Early administration of levosimendan reduced NT-proBNP levels in NSTEMI patients with elevated NT-proBNP and did not increase the total cost and length of hospitalization, but did not significantly improve MACE during hospitalization or at 6 months.
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Affiliation(s)
- F Xu
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - Y Bian
- Department of Emergency Medicine, Cheeloo College of Medicine, Shandong University, Jinan 250012, China
| | - G Q Zhang
- Department of Emergency, China-Japan Friendship Hospital, Beijing 100029, China
| | - L Y Gao
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - Y F Liu
- Department of Emergency, Zibo Central Hospital, Zibo 255036, China
| | - T X Liu
- Department of Emergency, Weifang People's Hospital, Weifang 261041, China
| | - G Li
- Department of Emergency, China-Japan Friendship Hospital, Beijing 100029, China
| | - R X Song
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - L J Su
- Department of Emergency, Zibo Central Hospital, Zibo 255036, China
| | - Y J Zhou
- Department of Emergency, Weifang People's Hospital, Weifang 261041, China
| | - J Y Cui
- Department of Cardiology, Binzhou People's Hospital, Binzhou 256600, China
| | - X L Yan
- Emergency Medicine Department, the Affiliated Hospital of Xuzhou Medical University, Xuzhou 221002, China
| | - F M Guo
- Department of Cardiology, Yantaishan Hospital, Yantai 264003,China
| | - H Y Zhang
- Department of Cardiology, the Central Hospital of Taian, Taian 271000, China
| | - Q H Li
- Department of Cardiology, Shenli Oilfield Central Hospital, Dongying 257000, China
| | - M Zhao
- Department of Emergency Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - L K Ma
- Department of Cardiology, the First Affiliated Hospital of USTC (Anhui Provincial Hospital), Hefei 230001, China
| | - B A You
- Department of Cardiology, Qilu Hospital of Shandong University (Qingdao), Qingdao 266031, China
| | - G Wang
- Department of Emergency Medicine, Qilu Hospital of Shandong University (Qingdao), Qingdao 266031, China
| | - L Kong
- Department of Emergency Center, Affiliated Hospital, Shandong University of Traditional Chinese Medicine, Jinan 250011, China
| | - J L Ma
- Department of Emergency Center, Affiliated Hospital, Shandong University of Traditional Chinese Medicine, Jinan 250011, China
| | - X F Zhou
- Department of Cardiology, Weihai Municipal Hospital, Weihai 264200, China
| | - Z L Chang
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - Z Y Tang
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - D Y Yu
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - K Cheng
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - L Xue
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - X Li
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - J J Pang
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - J L Wang
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
| | - H T Zhang
- Department of Surgical Intensive Care Unit, Fuwai Hospital, National Center for Cardiovascular Diseases, Beijing 100037, China
| | - X Z Yu
- Department of Emergency, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing 100730, China
| | - Y G Chen
- Department of Emergency Medicine, Qilu Hospital of Shandong University, Acute Heart Failure Unit (AHFU), Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine, Institute of Emergency and Critical Care Medicine of Shandong University, Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Key Laboratory of Cardiopulmonary-Cerebral Resuscitation Research of Shandong Province, Shandong Provincial Engineering Laboratory for Emergency and Critical Care Medicine, Jinan 250012, China
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Ding J, Teng P, Guan X, Luo Y, Ding H, Shi S, Zhou X, Ni G. Analysis of Short-Term Efficacy of Gasless Single-Port Laparoscopic Inguinal Lymphadenectomy Through Vulva Incision for Vulvar Cancer. Front Surg 2022; 9:813711. [PMID: 35402502 PMCID: PMC8987365 DOI: 10.3389/fsurg.2022.813711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 02/21/2022] [Indexed: 12/04/2022] Open
Abstract
Objective To investigate the feasibility and short-term efficacy of gasless single-port laparoscopic inguinal lymphadenectomy through vulva incision (VEIL-V). Methods The data of 9 patients diagnosed as vulvar squamous cell carcinoma who underwent single-port laparoscopic inguinal lymph node dissection through vulvectomy incision were retrospectively analyzed. And 13 patients who underwent laparoscopic inguinal lymph node dissection through lower abdominal subcutaneous approach as the control group (VEIL-H). The operation time, blood loss, numbers of unilateral lymph nodes, hospitalization time, and complications between the two groups were compared. Results The operation time of VEIL-V was 56.11 ± 5.94 min, which were shorter than that of VEIL-H (74.62 ± 5.50 min; P = 0.013). Bleeding amount in the VEIL-H was 29.44 ± 2.56, which was significantly lower than that of the VEIL-H group (43.08 ± 4.14 ml; P = 0.021). In the two groups, the numbers of unilateral lymph nodes harvested were similar. The differences in the postoperative hospital stay, skin, and lymphatic complications were not statistically significant. Conclusion Compared with VEIL-H, gasless single-port laparoscopic inguinal lymphadenectomy through vulva incision reduces the difficulty of operation with shorter operation time, and less blood loss, which can be a safe and mini-invasive surgical approach.
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Affiliation(s)
- Jin Ding
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Wannan Medical College, Wuhu, China
| | - Piaopiao Teng
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Wannan Medical College, Wuhu, China
| | - Xiaoming Guan
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX, United States
| | - Yonghong Luo
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Wannan Medical College, Wuhu, China
| | - Huafeng Ding
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Wannan Medical College, Wuhu, China
| | - Suhua Shi
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Wannan Medical College, Wuhu, China
| | - Xiufen Zhou
- Department of Gynecology, Lu'an Affiliated Hospital of Anhui Medical University, Lu'an, China
| | - Guantai Ni
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Wannan Medical College, Wuhu, China
- *Correspondence: Guantai Ni
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Wu P, Zhou LN, Xing Y, Sun HP, Wan LJ, Zhou CY, Zhang DD, Zhou XF, Zhang H, Chen MY, Wang YF, Wang NN, Liu WJ, Xu TL, Fu YW, Liu LJ, Yuan D, Chen M, Wang H. [Establishment of morphological reference values for the differential count of white blood cells in peripheral blood smear, as well as nucleated cells and megakaryocytes in bone marrow smear]. Zhonghua Yi Xue Za Zhi 2022; 102:506-512. [PMID: 35184504 DOI: 10.3760/cma.j.cn112137-20210819-01887] [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: 06/14/2023]
Abstract
Objective: To establish the morphological reference values for the differential count of white blood cells in peripheral blood smear as well as nucleated cells and megakaryocytes in bone marrow smear. Methods: From April 2012 to June 2020, 4 221 healthy donors for hematopoietic stem cell transplantation in Hebei Yanda Lu Daopei Hospital were selected. The median age was 36 (3-72) years old, including 2 520 males and 1 701 females. They were divided into four groups according to age: children group, with age≤14 years old [n=334, 11 (3-14) years old], youth group, with age >14 years old and <45 years old [n=2 855, 33 (15-44) years old], middle-aged adult group, with age ≥45 years old and < 60 years old [n=929, 49 (45-59) years old], and older adult group, with age ≥60 years old [n=103, 62 (60-72) years old]. Gender subgroups were established in each age group. According to different hematopoietic characteristics, the children group were divided into two subgroups: children group 1 [n=48, 6 (3-7) years old] and children group 2 [n=286, 11 (8-14) years old]. According to the clinical routine, 100 white blood cells in peripheral blood, 200 nucleated cells in bone marrow, and cell numbers/4.5 cm2 for megakaryocytes were classified and counted. The results of cell count in different age and gender groups were compared, and the reference values of morphological classification were established for different groups with statistical or clinical significance. Results: Due to the existence of statistically significant differences between children and adult groups and different gender subgroups in adults (all P<0.05), the reference values were established for children group and adult gender subgroups. The counts of segmented neutrophils and lymphocytes in peripheral blood were 46.65(43.97-49.32)% and 44.00(10.60-65.10)% in children group 1, 50.73(49.50-51.96)% and 39.55 (38.36-40.74)% in children group 2, and 57.00 (39.00-75.23) % and 33.00 (17.00-52.00) % in adult group, respectively. Bone marrow segmented neutrophils, orthochromatic erythroblasts, and mature lymphocytes were 11.54 (10.68-12.41)%, 14.20 (13.19-15.21)%, and 23.99 (22.06-25.92)% in children group 1, 12.50 (7.00-21.50)%, 15.00(9.50-25.50)%, and 21.02 (20.24-21.81)% in children group 2, 13.50 (7.50-21.00)%, 16.50 (10.50-26.00)%, and 15.50 (7.50-26.00)% in adult male group, and 14.50 (8.00-24.50)%, 14.50 (9.00-23.00)%, and 17.50 (8.50-29.00)% in adult female group, respectively. The myelopoiesis/erythropoiesis ratio in children group, adult male group and adult female group was 1.86∶1 (1.14∶1-3.23∶1), 1.96∶1 (1.12∶1-3.19∶1), 2.22∶1 (1.30∶1-3.69∶1), respectively. The numbers of granular megakaryocytes and thromocytogenic megakaryocytes were 138 (25-567) cells/4.5cm2 and 86 (13-328) cells/4.5 cm2 in children group, and 92 (13-338) cells/4.5 cm2 and 38 (3-162) cells/4.5 cm2 in adult group, respectively. Conclusion: The morphological reference values for the differential count of white blood cells in peripheral blood smear as well as nucleated cells and megakaryocytes in bone marrow smear are successfully established, which is helpful to improve the application of morphological examination in disease screening, diagnosis and monitoring.
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Affiliation(s)
- P Wu
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - L N Zhou
- Department of Clinical Laboratory, Peking University First Hospital, Beijing 100034, China
| | - Y Xing
- Department of Clinical Laboratory, Peking University First Hospital, Beijing 100034, China
| | - H P Sun
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - L J Wan
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - C Y Zhou
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - D D Zhang
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - X F Zhou
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - H Zhang
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - M Y Chen
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - Y F Wang
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - N N Wang
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - W J Liu
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - T L Xu
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - Y W Fu
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - L J Liu
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - D Yuan
- Department of Clinical Laboratory, Peking University First Hospital, Beijing 100034, China
| | - M Chen
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
| | - H Wang
- Department of Clinical Laboratory, Hebei Yanda Lu Daopei Hospital, Sanhe 065201, China
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Zhou XF, Chang ZS, Zhang YQ, Guo XJ. [Thyroid follicular carcinoma complicated with squamous cell carcinoma: report of a case]. Zhonghua Bing Li Xue Za Zhi 2022; 51:154-156. [PMID: 35152640 DOI: 10.3760/cma.j.cn112151-20210428-00333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- X F Zhou
- Department of Pathology, Affiliated Hospital of Qinghai University, Xining 810001, China
| | - Z S Chang
- Graduate School of Qinghai University, Xining 810001, China
| | - Y Q Zhang
- Department of Pathology, Affiliated Hospital of Qinghai University, Xining 810001, China
| | - X J Guo
- Department of Pathology, Affiliated Hospital of Qinghai University, Xining 810001, China
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Zhao D, Zhou YB, Fu Y, Wang L, Zhou XF, Cheng H, Li J, Song DW, Li SJ, Kang BL, Zheng LX, Nie LP, Wu ZM, Shan M, Yu FH, Ying JJ, Wang SM, Mei JW, Wu T, Chen XH. Intrinsic Spin Susceptibility and Pseudogaplike Behavior in Infinite-Layer LaNiO_{2}. Phys Rev Lett 2021; 126:197001. [PMID: 34047570 DOI: 10.1103/physrevlett.126.197001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 02/25/2021] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
The recent discovery of superconductivity in doped infinite-layer nickelates has stimulated intensive interest, especially for similarities and differences compared to that in cuprate superconductors. In contrast to cuprates, although earlier magnetization measurement reveals a Curie-Weiss-like behavior in undoped infinite-layer nickelates, there is no magnetic ordering observed by elastic neutron scattering down to liquid helium temperature. Until now, the nature of the magnetic ground state in undoped infinite-layer nickelates was still elusive. Here, we perform a nuclear magnetic resonance (NMR) experiment through ^{139}La nuclei to study the intrinsic spin susceptibility of infinite-layer LaNiO_{2}. First, the signature for magnetic ordering or freezing is absent in the ^{139}La NMR spectrum down to 0.24 K, which unambiguously confirms a paramagnetic ground state in LaNiO_{2}. Second, a pseudogaplike behavior instead of Curie-Weiss-like behavior is observed in both the temperature-dependent Knight shift and nuclear spin-lattice relaxation rate (1/T_{1}), which is widely observed in both underdoped cuprates and iron-based superconductors. Furthermore, the scaling behavior between the Knight shift and 1/T_{1}T has also been discussed. Finally, the present results imply a considerable exchange interaction in infinite-layer nickelates, which sets a strong constraint for the proposed theoretical models.
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Affiliation(s)
- D Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Y B Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Y Fu
- Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - L Wang
- Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - X F Zhou
- Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - H Cheng
- Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - J Li
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - D W Song
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - S J Li
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - B L Kang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - L X Zheng
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - L P Nie
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Z M Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - M Shan
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - F H Yu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - J J Ying
- CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - S M Wang
- Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - J W Mei
- Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - T Wu
- CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - X H Chen
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
- CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei, Anhui 230026, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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Zhou XF, Li GY, Wang YQ, Guo L, Wang DX, Yu M, Dong HH, Rong L, Tang SC. [Analysis of the self-conscious health status and influencing factors of greenhouse agricultural workers in Beijing suburb]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2021; 39:25-29. [PMID: 33535335 DOI: 10.3760/cma.j.cn121094-20191129-00547] [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 self-conscious health status and related influencing factors of greenhouse agricultural workers in Beijing suburb, so as to provide scientific basis for developing strategies to improve and promote the occupational health conditions of those workers. Methods: According to the production characteristics and scale of the main agricultural districts or counties in the suburb of Beijing, 182 agricultural production personnel were randomly selected to investigate the general situation, occupational situation and self-conscious health status during June 2018 to December 2019. The relevant factors which may affect the self-conscious health conditions were also analyzed by statistical methods. Results: The detection or reported rate of self-conscious health problems was 51.6% (94/182) , among which 29.1% (53/182) workers reported musculoskeletal disorder diseases and 21.4% (39/182) workers reported nervous system diseases. And the self-conscious health status of greenhouse agricultural workers were statistically different in household registration, gender, marital status, working years, mixing or spraying pesticides, smoking or eating in the greenhouse (P<0.05) . Moreover, gender, mixing or spraying pesticide, eating and smoking behavior in the workplace all had an impact on the risk of self-conscious health status of greenhouse agricultural workers (P< 0.05) . Specifically, male is the protective factor to reduce the occurrence of self-conscious symptoms of greenhouse agricultural workers (OR=0.447, 95%CI: 0.234~0.852) , while mixing or spraying pesticides and smoking or eating behaviors in the workplace are the risk factors (OR=1.055, 2.524; 95%CI: 0.503~2.210, 1.107~5.755) . Conclusion: Reducing pesticide use from the source thus minimize related exposure opportunities, strengthening occupational health education thus foster good hygienic habits and improve individual protection consciousness are of great significance for the health protection of greenhouse agricultural workers in Beijing suburb.
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Affiliation(s)
- X F Zhou
- Beijing Key Laboratory of Occupational Safety and Health, Beijing Municipal Institute of Labor Protection, Beijing 100054, China
| | - G Y Li
- Zibo Center for Disease Control and Prevention, Zibo 255026, China
| | - Y Q Wang
- Beijing Key Laboratory of Occupational Safety and Health, Beijing Municipal Institute of Labor Protection, Beijing 100054, China
| | - L Guo
- Beijing Key Laboratory of Occupational Safety and Health, Beijing Municipal Institute of Labor Protection, Beijing 100054, China
| | - D X Wang
- Beijing Key Laboratory of Occupational Safety and Health, Beijing Municipal Institute of Labor Protection, Beijing 100054, China
| | - M Yu
- Department of Occupational Diseases, Hangzhou Medical college, Hangzhou 310013, China
| | - H H Dong
- Beijing Prevention and Treatment Hospital of Occupational Disease for Chemical Industry, Beijing 100093, China
| | - L Rong
- Beijing Prevention and Treatment Hospital of Occupational Disease for Chemical Industry, Beijing 100093, China
| | - S C Tang
- Beijing Key Laboratory of Occupational Safety and Health, Beijing Municipal Institute of Labor Protection, Beijing 100054, China
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Hu ZH, Chen HH, Qian K, Ning CQ, Peng GH, Yu YF, Zhou XF, Chu YH, Xu D, Chen JX, Tian LG, Li H. [Prevalence and risk factors of Blastocystis hominis infections among AIDS patients in Nanchang City]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2020; 32:577-583. [PMID: 33325191 DOI: 10.16250/j.32.1374.2020208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To investigate the prevalence and risk factors of Blastocystis hominis infections among AIDS patients in Nanchang City. METHODS A cross-sectional questionnaire survey was conducted among AIDS patients in Nanchang City during the period between May and September, 2016. B. hominis infection was detected in patients'stool samples using a PCR assay, and the CD4+ T cell count was measured in subjects'blood samples. In addition, the risk factors of B. hominis infection in AIDS patients were identified using univariate and multivariate logistic regression analyses. RESULTS A survey was conducted in Nanchang City from May to September 2016. A total of 505 AIDS patients were investigated, and the prevalence of B. hominis infection was 4.16%. Univariate analysis revealed that B. hominis infection correlated with the occupation (χ2 = 8.595, P = 0.049), education level (χ2 = 14.494, P = 0.001), type of daily drinking water (χ2 = 10.750, P = 0.020), root of HIV infections (χ2 = 8.755, P = 0.026) and receiving anti-HIV therapy (χ2 = 23.083, P = 0.001) among AIDS patients, and multivariate logistic regression analysis identified daily direct drinking of tap water as a risk factor of B. hominis infections [odds ratio (OR) = 7.988, 95% confidential interval (CI): (1.160, 55.004)] and anti-HIV therapy as a protective factor of B. hominis infection [OR = 0.183, 95% CI: (0.049, 0.685)]. CONCLUSIONS The prevalence of B. hominis is 4.16% among AIDS patients in Nanchang City. Daily direct drinking of tap water is a risk factor, and anti-HIV therapy is a protective factor of B. hominis infection among AIDS patients living in Nanchang City.
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Affiliation(s)
- Z H Hu
- Research Base of the National Key Laboratory of Infectious Disease Prevention and Control, Key Laboratory of Animal Origin and Vector-borne Infectious Diseases of Jiangxi Province, Nanchang Center for Disease Control and Prevention, Jiangxi Province, Nanchang 330038, China
| | - H H Chen
- National Institute of Parasitic Disease, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Disease Research, WHO Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Key Laboratory of Parasites and Vector Biology, National Health Commission, China.,▵Co-first author
| | - K Qian
- Research Base of the National Key Laboratory of Infectious Disease Prevention and Control, Key Laboratory of Animal Origin and Vector-borne Infectious Diseases of Jiangxi Province, Nanchang Center for Disease Control and Prevention, Jiangxi Province, Nanchang 330038, China
| | - C Q Ning
- National Institute of Parasitic Disease, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Disease Research, WHO Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Key Laboratory of Parasites and Vector Biology, National Health Commission, China
| | - G H Peng
- Research Base of the National Key Laboratory of Infectious Disease Prevention and Control, Key Laboratory of Animal Origin and Vector-borne Infectious Diseases of Jiangxi Province, Nanchang Center for Disease Control and Prevention, Jiangxi Province, Nanchang 330038, China
| | - Y F Yu
- National Institute of Parasitic Disease, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Disease Research, WHO Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Key Laboratory of Parasites and Vector Biology, National Health Commission, China
| | - X F Zhou
- Research Base of the National Key Laboratory of Infectious Disease Prevention and Control, Key Laboratory of Animal Origin and Vector-borne Infectious Diseases of Jiangxi Province, Nanchang Center for Disease Control and Prevention, Jiangxi Province, Nanchang 330038, China
| | - Y H Chu
- National Institute of Parasitic Disease, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Disease Research, WHO Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Key Laboratory of Parasites and Vector Biology, National Health Commission, China
| | - D Xu
- Research Base of the National Key Laboratory of Infectious Disease Prevention and Control, Key Laboratory of Animal Origin and Vector-borne Infectious Diseases of Jiangxi Province, Nanchang Center for Disease Control and Prevention, Jiangxi Province, Nanchang 330038, China
| | - J X Chen
- National Institute of Parasitic Disease, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Disease Research, WHO Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Key Laboratory of Parasites and Vector Biology, National Health Commission, China
| | - L G Tian
- National Institute of Parasitic Disease, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Disease Research, WHO Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Key Laboratory of Parasites and Vector Biology, National Health Commission, China
| | - H Li
- Nanchang Municipal Health Commission, Jiangxi Province, China
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Yang CR, Zhang XY, Liu Y, Du JY, Liang R, Yu M, Zhang FQ, Mu XF, Li F, Zhou L, Zhou FH, Meng FJ, Wang S, Ming D, Zhou XF. Antidepressant Drugs Correct the Imbalance Between proBDNF/p75NTR/Sortilin and Mature BDNF/TrkB in the Brain of Mice with Chronic Stress. Neurotox Res 2020; 37:171-182. [PMID: 31493120 DOI: 10.1007/s12640-019-00101-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [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] [Received: 06/18/2019] [Revised: 08/16/2019] [Accepted: 08/20/2019] [Indexed: 02/08/2023]
Abstract
Depression is a worldwide problem with a great social and economic burden in many countries. In our previous research, we found that the expression of proBDNF/p75NTR/sortilin is upregulated in patients with major depressive disorder. In addition, the treatment of proBDNF antibodies reversed both the depressive behaviors and the reduced BDNF mRNA detected in our rodent chronic stress models. Antidepressant drugs are usually only effective in a subpopulation of patients with major depression with a delayed time window of 2-4 weeks to exert their efficacy. The mechanism underlying such delayed response is not known. In this study, we hypothesize that antidepressant drugs exert their therapeutic effect by modulating proBDNF/p75NTR and mature BDNF/TrkB signaling pathways. To test the hypothesis, C57 mice were randomly divided into normal control, chronic unpredictable mild stress (CUMS), vehicle (VEH), fluoxetine (FLU), and clozapine (CLO) groups. Behavioral tests (sucrose preference, open field, and tail suspension tests) were performed before and after 4 weeks of CUMS. The gene and protein expression of proBDNF, the neurotrophin receptor (p75NTR), sortilin, and TrkB in the cortex and hippocampus were examined. At the protein level, CUMS induced a significant increase in proBDNF, p75NTR, and sortilin production while the TrkB protein level was found to be lower in the cortex and hippocampus compared with the control group. Consistently, at the mRNA level, p75NTR expression increased with reduced BDNF/TrkB mRNA in both cortex and hippocampus, while sortilin increased only in the hippocampus after CUMS. FLU and CLO treatments of CUMS mice reversed all protein and mRNA expression of the biomarkers in both cortex and hippocampus, except for sortilin mRNA in the cortex and proBDNF in the hippocampus, respectively. This study further confirms that the imbalance between proBDNF/p75NTR/sortilin and mBDNF/TrkB production is important in the pathogenesis of depression. It is likely that antidepressant FLU and antipsychotic CLO exert their antidepressant-like effect correcting the imbalance between proBDNF/p75NTR/sortilin and mBDNF/TrkB.
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Affiliation(s)
- C R Yang
- Department of Pathology, The Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, People's Republic of China
| | - X Y Zhang
- Department of Pathology, The Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Y Liu
- Tianjin Mental Health Center, Tianjin, People's Republic of China
| | - J Y Du
- Tianjin Mental Health Center, Tianjin, People's Republic of China
| | - R Liang
- Department of Pathology, The Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - M Yu
- Department of Pathology, The Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - F Q Zhang
- Department of Neurology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - X F Mu
- Department of Clinical Laboratory, Qingdao Central Hospital, Qingdao, Shandong Province, People's Republic of China
| | - F Li
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha, Hunan Province, People's Republic of China
| | - L Zhou
- The Mental Hospital of Yunnan Province, Kunming, Yunnan Province, People's Republic of China
| | - F H Zhou
- School of Pharmacology and Medical Science, University of South Australia, Adelaide, 5000, Australia
| | - F J Meng
- Department of Thoracic Surgery, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - S Wang
- Department of Thoracic Surgery, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - D Ming
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, People's Republic of China.
| | - X F Zhou
- School of Pharmacology and Medical Science, University of South Australia, Adelaide, 5000, Australia.
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9
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Pu T, Mei Z, Zhang W, Liang WJ, Zhou X, Liang J, Deng Z, Wang Z. An in vitro DNA phosphorothioate modification reaction. Mol Microbiol 2019; 113:452-463. [PMID: 31749226 DOI: 10.1111/mmi.14430] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 11/10/2019] [Accepted: 11/17/2019] [Indexed: 12/25/2022]
Abstract
Phosphorothioation (PT) involves the replacement of a nonbridging phosphate oxygen on the DNA backbone with sulfur. In bacteria, the procedure is both sequence- and stereo-specific. We reconstituted the PT reaction using purified DndCDE from Salmonella enterica and IscS from Escherichia coli. We determined that the in vitro process of PT was oxygen sensitive. Only one strand on a double-stranded (ds) DNA substrate was modified in the reaction. The modification was dominant between G and A in the GAAC/GTTC conserved sequence. The modification between G and T required the presence of PT between G and A on the opposite strand. Cysteine, S-adenosyl methionine (SAM) and the formation of an iron-sulfur cluster in DndCDE (DndCDE-FeS) were essential for the process. Results from SAM cleavage reactions support the supposition that PT is a radical SAM reaction. Adenosine triphosphate (ATP) promoted the reaction but was not essential. The data and conclusions presented suggest that the PT reaction in bacteria involves three steps. The first step is the binding of DndCDE-FeS to DNA and searching for the modification sequence, possibly with the help of ATP. Cysteine locks DndCDE-FeS to the modification site with an appropriate protein conformation. SAM triggers the radical SAM reaction to complete the oxygen-sulfur swapping.
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Affiliation(s)
- Tianning Pu
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Zhiling Mei
- Shanghai Thinkgene Biotech CO., LTD, Shanghai, People's Republic of China
| | - Wei Zhang
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Wei-Jun Liang
- Department of Life and Environmental Sciences, Faculty of Science and Technology, Bournemouth University, Poole, UK
| | - Xiufen Zhou
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Jingdan Liang
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Zhijun Wang
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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Zou GM, Zhuo L, Zhou XF, Chen HX, Li WG. [Clinical analysis of 43 cases of retroperitoneal laparoscopic renal biopsy]. Zhonghua Yi Xue Za Zhi 2019; 99:2532-2535. [PMID: 31484282 DOI: 10.3760/cma.j.issn.0376-2491.2019.32.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: Percutaneous renal biopsycurrently is the most important and widely used method of renal biopsy. However, there still are some patients in whom a percutaneous approach may be considered a major risk. In these patients, renal biopsy under direct vision is a reliable alternative. We described our personal technique and experience in a series of Chinese patients who underwent retroperitoneal laparoscopic renal biopsy. Methods: We retrospectively reviewed the patients who had performed retroperitoneal laparoscopic renal biopsy over a 4-year period (Jan 2013 to Jan 2017).Forty-three patients with renal dysfunction were involved inour center.Especially some patients showed atrophic kidney and poor visualization on ultrasonography. The patients' abnormal conditions includeddialysis (10 cases), morbid obesity (5 cases), deaf-mutes (2 cases) and uncontrolled severe hypertension. The kidney was approached via alaparoscopic retroperitoneal route using athree-ports technique. Then biopsies were performed bya 16-gaugebiopsy needle, and hemostasis was achieved by compression.In less cases, a topical spray hemostatic gel was required. Results: Biopsy was performed successfully in all cases and adequate renal tissue was acquired.Mean operative time was 59.4 minutes, mean blood loss was 36.5 ml.Under general anesthesia, no anesthetic accidents and related complications were recorded. Forty-onepatients were discharged within 24 h after operation. Onepatient occurred disseminated intravascular coagulationduring operation. Red blood cell transfusion and fresh-frozen plasma infusion were performed. Injury at hilum of kidney was detected in another patient. And extrapyelogenic repair surgery was performed. Conclusions: The retroperitoneallaparoscopic renal biopsy is a safe, reliable, minimallyinvasive alternative renal biopsy method with better haemostasis, fewer complications and a rapid recovery. As the helpful supplement of percutaneous renal biopsy, this technique may have to be used more often in the future.
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Affiliation(s)
- G M Zou
- Graduate School of Peking Union Medical College, Division of Nephrology, China-Japan Friendship Hospital, Beijing 100730, China
| | - L Zhuo
- Division of Nephrology, China-Japan Friendship Hospital, Beijing 100029, China
| | - X F Zhou
- Division of Urology, China-Japan Friendship Hospital, Beijing 100029, China
| | - H X Chen
- Division of Urology, China-Japan Friendship Hospital, Beijing 100029, China
| | - W G Li
- Graduate School of Peking Union Medical College, Division of Nephrology, China-Japan Friendship Hospital, Beijing 100730, China
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Hu Y, Liu Q, Zhou XF, Huang LL, Sun H. [Screening of optimal siRNA interference sequence of CIT gene and its inhibition expression in hepatoma SK-Hep-1]. Zhonghua Gan Zang Bing Za Zhi 2019; 27:281-285. [PMID: 31082339 DOI: 10.3760/cma.j.issn.1007-3418.2019.04.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To construct and screen optimal siRNA interference sequence of CIT gene and to detect its interference efficiency as well as proliferation effect in human hepatoma cell line SK-Hep-1. Methods: Three siRNA target spots were designed and synthesized according to the CIT gene sequence. SK-Hep-1 HCC cells were transfected by liposome transfection. The knockdown efficiency of the target CIT gene was detected by real-time PCR and Western blot. Expressional change of CIT in SK-Hep-1 cells after 48 hours of siRNA interference were observed by immunohistochemistry and confocal microscopy. The proliferation of SK-Hep-1 cells after 48 hours of siRNA interference was detected by EdU cell proliferation assay. A t-test was used to compare the mean of two samples, and one-way ANOVA was used to compare the mean of multiple samples. Results: Western blot results showed that the three interference sequences were targeted at different target spots. The expression level of CIT protein in KD-1,-2, and-3 groups were decreased (P < 0.01) than control, while the protein expression level of KD1 group was the lowest. Real-time PCR results showed that compared with the control group, the expression level of CIT mRNA in KD-1, -2, and -3 groups decreased (P < 0.01), while that in KD1 group was the lowest. Laser confocal microscopy also confirmed that the morphological expression of CIT attenuated significantly after transfection with siRNA. The results of EdU proliferation assay showed that siRNA transfected with CIT significantly attenuated the proliferation of SK-Hep-1 hepatoma cells (P < 0.05). Conclusion: The successful construction and screening of siRNA fragments can effectively inhibit the expression and proliferation of CIT gene in hepatoma SK-Hep-1.
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Affiliation(s)
- Y Hu
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education and Department of Infectious Diseases, Chongqing Medical University, Chongqing 400016, China
| | - Q Liu
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education and Department of Infectious Diseases, Chongqing Medical University, Chongqing 400016, China
| | - X F Zhou
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education and Department of Infectious Diseases, Chongqing Medical University, Chongqing 400016, China
| | - L L Huang
- Department of Nephrology, the Second Affiliated Hospital, Chongqing Medical University, Chongqing 400010, China
| | - H Sun
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education and Department of Infectious Diseases, Chongqing Medical University, Chongqing 400016, China
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Zhang YR, Xu KJ, Bai YL, Tang LQ, Jiang ZY, Liu YP, Liu ZJ, Zhou LC, Zhou XF. Features of the volume change and a new constitutive equation of hydrogels under uniaxial compression. J Mech Behav Biomed Mater 2018; 85:181-187. [PMID: 29906673 DOI: 10.1016/j.jmbbm.2018.06.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 04/23/2018] [Revised: 05/26/2018] [Accepted: 06/02/2018] [Indexed: 11/26/2022]
Abstract
For high-water content hydrogels in compression, the water inside of hydrogels contributes to the response of hydrogels to external loads directly, but part of the water is expelled from hydrogels in the meantime to change the volume of the hydrogel and reduce the contribution. In order to consider the contribution of the water in the constitution equation, PVA (polyvinyl alcohol) hydrogels with high-water content were used as examples, and compressive experiments were carried out to measure both the stress-strain relation and the change of the volume in the meantime. By considering the effect of the difference of the contribution of water in different directions of the hydrogel, we deduced a new constitutive equation, which can pretty well depict the stress-strain of hydrogels with different water contents. The results showed that the contribution of water to the total stress increases with the compression strain and even exceed that of the polymer, although the expelled water reduces the contribution at the early loading stage, which well explains the difference of elastic moduli of hydrogels in compression and tension.
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Affiliation(s)
- Y R Zhang
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China; Guangdong Institute of Intelligent Manufacturing, Guangzhou, China
| | - K J Xu
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China
| | - Y L Bai
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China; LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
| | - L Q Tang
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China; State Key Laboratory of Subtropical Building Science, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China.
| | - Z Y Jiang
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China
| | - Y P Liu
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China
| | - Z J Liu
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China
| | - L C Zhou
- School of Civil Engineering and Transportation, South China University of Technology, No.381, Wushan Road, Guangzhou, Guangdong, China
| | - X F Zhou
- Guangdong Institute of Intelligent Manufacturing, Guangzhou, China
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Wang JF, Zhou XF, Fang DB, Wu ZM, Ding ZS, Chen X, Liu NB. [The effect of tri-modality therapy on the treatment of muscle-invasive bladder cancer]. Zhonghua Yi Xue Za Zhi 2018; 98:1614-1616. [PMID: 29886656 DOI: 10.3760/cma.j.issn.0376-2491.2018.20.018] [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 effect of radical TURBT combing with concomitant chemo-radiotherapy for muscle-invasive bladder cancer (MIBC). Methods: From 2010 to 2015, 73 patients were diagnosed as MIBC, in which 28 patients (TMT Group) received tri-modality bladder sparing treatment, including 21 males and 7 females, mean age (68.9±8.9) yr. There were 16 cases of T(2), 12 cases of T(3). 45 patients (RC Group) received radical cystectomy (RC), including 32 males and 13 females, mean age (66.3±9.6) yr. There were 25 cases of T(2), 18 cases of T(3) and 2 cases of T(4a). The effect of two treatment modality and influence for patient's life quality were retrospective analysis. Results: The overall survival (OS) rate of TMT group was 64.3%, cancer specific survival (CSS) rate was 78.6%. And the OS rate of RC group was 66.7%, CSS rate was 82.2%. There was no statistical difference between two groups. The life quality of TMT group was better than that of RC group. Conclusion: In strict control of indication criterion, rigorous postoperative follow-up and timely salvage radical cystectomy, tri-modality therapy can be used as a new option of muscle-invasive bladder cancer.
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Affiliation(s)
- J F Wang
- Department of Urology, China-Japan Friendship Hospital, Beijing 100029, China
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Chen XZ, Zarzuela R, Zhang J, Song C, Zhou XF, Shi GY, Li F, Zhou HA, Jiang WJ, Pan F, Tserkovnyak Y. Antidamping-Torque-Induced Switching in Biaxial Antiferromagnetic Insulators. Phys Rev Lett 2018; 120:207204. [PMID: 29864355 DOI: 10.1103/physrevlett.120.207204] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 03/15/2018] [Indexed: 06/08/2023]
Abstract
We investigate the current-induced switching of the Néel order in NiO(001)/Pt heterostructures, which is manifested electrically via the spin Hall magnetoresistance. Significant reversible changes in the longitudinal and transverse resistances are found at room temperature for a current threshold lying in the range of 10^{7} A/cm^{2}. The order-parameter switching is ascribed to the antiferromagnetic dynamics triggered by the (current-induced) antidamping torque, which orients the Néel order towards the direction of the writing current. This is in stark contrast to the case of antiferromagnets such as Mn_{2}Au and CuMnAs, where fieldlike torques induced by the Edelstein effect drive the Néel switching, therefore resulting in an orthogonal alignment between the Néel order and the writing current. Our findings can be readily generalized to other biaxial antiferromagnets, providing broad opportunities for all-electrical writing and readout in antiferromagnetic spintronics.
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Affiliation(s)
- X Z Chen
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - R Zarzuela
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
| | - J Zhang
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - C Song
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - X F Zhou
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - G Y Shi
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - F Li
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - H A Zhou
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - W J Jiang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - F Pan
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Y Tserkovnyak
- Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
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Wang RJ, Wen ML, Zhou Q, Wei XW, Li H, Zhao YB, Qi YF, Luan J, Zhou XF. [Downregulation of large conductance calcium-activated potassium channels in paraventricular nucleus contributes to sympathoexcitation in rats with chronic heart failure]. Zhonghua Xin Xue Guan Bing Za Zhi 2018; 46:178-186. [PMID: 29562421 DOI: 10.3760/cma.j.issn.0253-3758.2018.03.003] [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: 06/08/2023]
Abstract
Objective: To elucidate the association between large conductance calcium-activated potassium channels (BKCa) in the paraventricular hypothalamic nucleus (PVN) and sympathetic outflow in rats with chronic heart failure (CHF) . Methods: Male Wistar rats (6-7 weeks old) were randomized to sham operated group and CHF group (coronary artery ligation) . Two weeks after operation, BKCa inhibitor Iberiotoxin (IBTX) was infused into PVN by osmotic minipumps, rats were divided into following groups: sham+aCSF, CHF+aCSF, sham+low dose IBTX (0.125 nmol/nl) , CHF+low dose IBTX, sham+moderate dose IBTX (1.25 nmol/nl) , CHF+moderate dose IBTX, sham+ high dose IBTX (12.5 nmol/nl) , and CHF+high dose IBTX (n=6 each) . Additional rats were grouped as follows: sham+vehicle, sham+KCNMB4 knockdown (by rAAV2-KCNMB4 shRNA virus injection in PVN) , CHF+vehicle, CHF+ KCNMB4 knockdown group (n=6 each) . The cardiac function was determined by echocardiography, left ventricular hemodynamics were measured invasively, renal sympathetic nerve activity (RSNA) was recorded at 6 weeks after coronary artery ligation or sham operation. The contents of norepinephrine (NE) and N-terminal pro-B-type natriuretic peptide (NT-proBNP) in plasma were determined by enzyme-linked immunosorbent assay. The protein and mRNA expression of KCNMB4 in PVN were measured by immunofluorescence staining, Western blot, and real-time PCR, mRNA expression of BKCa in PVN was detected by real-time PCR. Results: Compared with the sham operation group, the cardiac function of the heart failure group was significantly reduced (P<0.05) , and the plasma NE and the serum NT-proBNP were significantly elevated (P<0.05) . The protein and mRNA expression of KCNMB4 in PVN were obviously down-regulated in CHF rats (P<0.05) . After perfusion of IBTX or KCNMB4 knockdown by microinjection of rAAV2-KCNMB4 shRNA virus,right ventricular weight/body weight and lung weight/body weight ratio as well as left ventricular end-diastolic diameter were increased and left ventricular ejection fraction was decreased (all P<0.05) , the sympathetic driving indexes was increased in sham rats, changes of these parameters further aggravated in CHF rats (P<0.05) . KCNMB4 knockdown further downregulated protein expression in PVN of CHF rats. Conclusion: Downregulation and blunted function of BKCa in PVN may contribute to sympathoexcitation and deterioration of cardiac function in rats with chronic heart failure.
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Affiliation(s)
- R J Wang
- Departments of Biotechnology, College of Life Science, Jilin Normal University, Siping 136000, China
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16
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Chen XZ, Feng JF, Wang ZC, Zhang J, Zhong XY, Song C, Jin L, Zhang B, Li F, Jiang M, Tan YZ, Zhou XJ, Shi GY, Zhou XF, Han XD, Mao SC, Chen YH, Han XF, Pan F. Tunneling anisotropic magnetoresistance driven by magnetic phase transition. Nat Commun 2017; 8:449. [PMID: 28878205 PMCID: PMC5587625 DOI: 10.1038/s41467-017-00290-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [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: 01/14/2017] [Accepted: 06/20/2017] [Indexed: 11/18/2022] Open
Abstract
The independent control of two magnetic electrodes and spin-coherent transport in magnetic tunnel junctions are strictly required for tunneling magnetoresistance, while junctions with only one ferromagnetic electrode exhibit tunneling anisotropic magnetoresistance dependent on the anisotropic density of states with no room temperature performance so far. Here, we report an alternative approach to obtaining tunneling anisotropic magnetoresistance in α′-FeRh-based junctions driven by the magnetic phase transition of α′-FeRh and resultantly large variation of the density of states in the vicinity of MgO tunneling barrier, referred to as phase transition tunneling anisotropic magnetoresistance. The junctions with only one α′-FeRh magnetic electrode show a magnetoresistance ratio up to 20% at room temperature. Both the polarity and magnitude of the phase transition tunneling anisotropic magnetoresistance can be modulated by interfacial engineering at the α′-FeRh/MgO interface. Besides the fundamental significance, our finding might add a different dimension to magnetic random access memory and antiferromagnet spintronics. Tunneling anisotropic magnetoresistance is promising for next generation memory devices but limited by the low efficiency and functioning temperature. Here the authors achieved 20% tunneling anisotropic magnetoresistance at room temperature in magnetic tunnel junctions with one α′-FeRh magnetic electrode.
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Affiliation(s)
- X Z Chen
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - J F Feng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, China
| | - Z C Wang
- Beijing National Center for Electron Microscopy, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.,Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - J Zhang
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - X Y Zhong
- Beijing National Center for Electron Microscopy, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - C Song
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
| | - L Jin
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - B Zhang
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - F Li
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - M Jiang
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Y Z Tan
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - X J Zhou
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - G Y Shi
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - X F Zhou
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - X D Han
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - S C Mao
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - Y H Chen
- Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China
| | - X F Han
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, China
| | - F Pan
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
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17
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Xu LF, Cai YF, Hu K, Tang S, Zhou XF, Li HM. [Effects of chronic intermittent hypoxia on left ventricular myocardial contractibility in a rabbit model of obstructive sleep apnea]. Zhonghua Yi Xue Za Zhi 2017; 97:2528-2532. [PMID: 28835062 DOI: 10.3760/cma.j.issn.0376-2491.2017.32.012] [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 effects of chronic intermittent hypoxia (CIH) on left ventricular myocardial contractibility in a rabbit model of obstructive sleep apnea (OSA). Methods: Based on random number table, twenty-four rabbits were randomly divided into three groups: operation, sham, and control groups, each with 8 rabbits. The rabbit model for OSA in operation group was established by repeatedly closing the airway and then reopening it. Upper airway obstructions were conducted on rabbits every day, which were alternately closed for 15 s and then reopened for 75 s in a 90 s-long cycle, for 8 h each day over 3 months. The sham rabbits were subjected to the same surgical procedure but no airway obstructions were applied. The control animals were subjected to no intervention. The blood pressure, left ventricular function parameters were assessed before and after the experiment. And the relative expressions of myosin heavy chain α/β (α-MHC and β-MHC) mRNAs in myocardium were observed for all rabbits by real time fluorescent quantitative polymerase chain reaction 3 months later. Results: After 3 months, all rabbits in the operation group manifested sleepiness and the blood pressure rose gradually [(114.25±4.20) vs (93.88±2.10) mmHg, P<0.01]. Compared with the sham operation and the control groups, the left ventricular end-systolic volume [(6.05±1.62) vs (2.83±0.49) and (2.74±0.32) ml, P<0.001] and the left ventricular end-diastolic volume [(1.61±0.78) vs (0.83±0.13) and (0.82±0.10) ml] in operation group were obviously higher, the left ventricular ejection fraction [(63.9±4.2) % vs (74.3±2.5) % and (75.8±3.8) %], left ventricular fractional shortening [(32.2±2.1) % vs (41.8±1.8) % and (42.1±1.8) %] and stroke volume [(1.46±0.13) vs (1.93±0.21) and (1.98±0.24) ml/s] were decreased (all P<0.001). Besides, the maximal rate of the increase of left ventricular pressure [(4 154±360) vs (6 802±492) and (6 759±206) mmHg/s], the maximal rate of the decrease of left ventricular pressure [(4 994±621) vs (6 330±314) and (6 591±225) mmHg/s] in the operation group decreased markedly, left ventricular end diastolic pressure (LVEDP) increased [(6.5±1.6) vs (3.3±0.8) and (3.2±0.9) mmHg] (all P<0.001). The relative expression of α-MHC mRNA in left ventricular myocardial tissue was lower and the relative expression of β-MHC mRNA was higher in operation group than those in the sham operation and the control groups (P<0.05). There were no significant difference in the relevant indicators of cardiac function, and in the relative expressions of α-MHC mRNA and the β-MHC mRNA between the control group and the sham operation group (P>0.05). Conclusions: Repeated intermittent hypoxia can induce hypertension and myocardial contractibility damage in OSA model rabbit simulating upper airway obstruction.
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Affiliation(s)
- L F Xu
- Respiratory Department, Renmin Hospital of Wuhan University, Wuhan 430060, China
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18
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Xu B, Yang CZ, Wu SB, Zhang D, Wang LN, Xiao L, Chen Y, Wang CR, Tong A, Zhou XF, Li XH, Guan XH. [Risk factors for lower extremity amputation in patients with diabetic foot]. Zhonghua Nei Ke Za Zhi 2017; 56:24-28. [PMID: 28056319 DOI: 10.3760/cma.j.issn.0578-1426.2017.01.007] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the risk factors for lower extremity amputation in patients with diabetic foot. Methods: The clinical data of 1 771 patients with diabetic foot at the Air Force General Hospital of PLA from November 2001 to April 2015 were retrospectively analyzed. The patients were divided into the non-amputation and amputation groups. Within the amputation group, subjects were further divided into the minor and major amputation subgroups. Binary logistic regression analyses were used to assess the association between risk factors and lower extremity amputation. Results: Among 1 771 patients with diabetic foot, 323 of them (18.24%) were in the amputation group (major amputation: 41; minor amputation: 282) and 1 448 (81.76%) in the non-amputation group. Compared with non-amputation patients, those in the amputation group had a longer hospital stay and higher estimated glomerular filtration rate(eGFR)levels. Fasting plasma glucose (FPG), glycosylated hemoglobin (HbA1c), C-reaction protein (CRP), ESR, ferritin, fibrinogen and WBC levels of the amputation group were higher, while hemoglobin albumin, transferrin, TC, TG, HDL-C and LDL-C were lower than those of the non-amputation group (all P<0.05). The proportion of hypertension(52.48% vs 59.98%), peripheral vascular disease (PAD)(68.11% vs 25.04%), and coronary heart disease(21.33% vs 28.71%)were different between the amputation and non-amputation groups (all P<0.05). Multivariable logistic regression analyses showed that Wagner's grade, PAD and CRP were the independent risk factors associated with lower extremity amputation in hospitalized patients with diabetic foot. Conclusion: Wagner's grade, ischemia of lower limbs and infection are closely associated with amputation of diabetic foot patients.
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Affiliation(s)
- B Xu
- Department of Endocrinology, Air Force General Hospital of PLA, Beijing 100142, China
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19
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Gao XY, Zhou XF, Wang H, Lv N, Liu Y, Guo JR. Effects of heme oxygenase-1 recombinant Lactococcus lactis on the intestinal barrier of hemorrhagic shock rats. ACTA ACUST UNITED AC 2017; 50:e5601. [PMID: 28591377 PMCID: PMC5463530 DOI: 10.1590/1414-431x20175601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 03/22/2017] [Indexed: 12/22/2022]
Abstract
This study aimed to investigate the effects of heme oxygenase-1 recombinant Lactococcus lactis (LL-HO-1) on the intestinal barrier of rats with hemorrhagic shock. One hundred Sprague-Dawley male rats (280-320 g) were randomly divided into healthy control group (N group) and hemorrhagic shock group (H group). Each group was subdivided into HO1t, HO2t, HO3t, PBS and LL groups in which rats were intragastrically injected with LL-HO-1 once, twice and three times, PBS and L. lactis (LL), respectively. The mortality, intestinal myeloperoxidase (MPO) activity, intestinal contents of TNF-α, IL-10 and HO-1, and intestinal Chiu's score were determined. Results showed that in N group, the HO-1 content increased after LL-HO-1 treatment, and significant difference was observed in HO1t group and HO2t group (P<0.05). In H groups, MPO activity and Chiu's score decreased, but IL-10 content increased in LL-HO-1-treated groups when compared with PBS and LL groups (P<0.05). When compared with N group, the MPO activity reduced dramatically in LL-HO-1-treated groups. Thus, in healthy rats (N group), intragastrical LL-HO-1 treatment may increase the intestinal HO-1 expression, but has no influence on the intestinal barrier. In hemorrhagic shock rats, LL-HO-1 may significantly protect the intestinal barrier, and repeating the intragastrical LL-HO-1 treatments twice has the most obvious protection.
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Affiliation(s)
- X Y Gao
- Department of Anesthesiology, Gongli Hospital, Second Military Medical University, Shanghai, China.,Shool of Medicine, Shandong University, Shandong, China
| | - X F Zhou
- Department of Anesthesiology, Gongli Hospital, Second Military Medical University, Shanghai, China
| | - H Wang
- Department of Anesthesiology, Gongli Hospital, Second Military Medical University, Shanghai, China
| | - N Lv
- Department of Anesthesiology, Gongli Hospital, Second Military Medical University, Shanghai, China
| | - Y Liu
- Department of Anesthesiology, Gongli Hospital, Second Military Medical University, Shanghai, China
| | - J R Guo
- Department of Anesthesiology, Gongli Hospital, Second Military Medical University, Shanghai, China
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Zhao M, Zhou X, Tang J, Deng Z, Xu X, Chen Z, Li X, Yang L, Ma LJ. Pyrene excimer-based fluorescent sensor for detection and removal of Fe 3+ and Pb 2+ from aqueous solutions. Spectrochim Acta A Mol Biomol Spectrosc 2017; 173:235-240. [PMID: 27665191 DOI: 10.1016/j.saa.2016.09.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 09/12/2016] [Accepted: 09/18/2016] [Indexed: 06/06/2023]
Abstract
Pyrene excimer usually serves as a chromogenic unit for developing ratiometric fluorescent sensors. But this study used excimer as a large hydrophobic group to regulate the molecular hydrophobicity, and obtained a new fluorescent sensor, N, N-bi[4(1-pyrene)-butyroyl]ornithine (1), for detection and removal of Fe3+ and Pb2+ from aqueous solutions. The coordination of 1 and Fe3+ in the aqueous solution or even pure water forms removable flocculent precipitates, accompanied by obvious fluorescent quenching of emission spectra. In aqueous solutions containing 40% (v/v) acetonitrile, the special responses exhibit a high selectivity and sensitivity to Fe3+ over other common metal ions. However, in aqueous solutions containing 40% (v/v) dimethylsulfoxide, the probe exhibits the analogous fluorescent quenching responses and the removable flocculent precipitates in the presence Fe3+ and Pb2+. These results indicate that the extremely hydrophobic 1-Fe3+/Pb2+ complexes are not only a supplement to the fluorescent sensing of Fe3+ and Pb2+, but also a requirement to the removal of Fe3+ and Pb2+ from aqueous solutions.
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Affiliation(s)
- Meili Zhao
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Xiufen Zhou
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Jian Tang
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Zhifu Deng
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Xuan Xu
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Zhi Chen
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Xutian Li
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Liting Yang
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China
| | - Li-Jun Ma
- School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, PR China.
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Dai D, Du A, Xiong K, Pu T, Zhou X, Deng Z, Liang J, He X, Wang Z. DNA Phosphorothioate Modification Plays a Role in Peroxides Resistance in Streptomyces lividans. Front Microbiol 2016; 7:1380. [PMID: 27630631 PMCID: PMC5005934 DOI: 10.3389/fmicb.2016.01380] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 08/22/2016] [Indexed: 12/12/2022] Open
Abstract
DNA phosphorothioation, conferred by dnd genes, was originally discovered in the soil-dwelling bacterium Streptomyces lividans, and thereafter found to exist in various bacterial genera. However, the physiological significance of this sulfur modification of the DNA backbone remains unknown in S. lividans. Our studies indicate that DNA phosphorothioation has a major role in resistance to oxidative stress in the strain. Although Streptomyces species express multiple catalase/peroxidase and organic hydroperoxide resistance genes to protect them against peroxide damage, a wild type strain of S. lividans exhibited two-fold to 10-fold higher survival, compared to a dnd− mutant, following treatment with peroxides. RNA-seq experiments revealed that, catalase and organic hydroperoxide resistance gene expression were not up-regulated in the wild type strain, suggesting that the resistance to oxidative stress was not due to the up-regulation of these genes by DNA phosphorothioation. Quantitative RT-PCR analysis was conducted to trace the expression of the catalase and the organic hydroperoxide resistance genes after peroxides treatments. A bunch of these genes were activated in the dnd− mutant rather than the wild type strain in response to peroxides. Moreover, the organic hydroperoxide peracetic acid was scavenged more rapidly in the presence than in the absence of phosphorothioate modification, both in vivo and in vitro. The dnd gene cluster can be up-regulated by the disulfide stressor diamide. Overall, our observations suggest that DNA phosphorothioate modification functions as a peroxide resistance system in S. lividans.
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Affiliation(s)
- Daofeng Dai
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Aiqin Du
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Kangli Xiong
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Tianning Pu
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Xiufen Zhou
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Jingdan Liang
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Xinyi He
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
| | - Zhijun Wang
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University Shanghai, China
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Tang S, Zhou XF, Hu K, Xu LF, Yu JX, Li HM. [Cluster analysis of the clinical presentations in patients with moderate-to-severe obstructive sleep apnea syndrome and its significance]. Zhonghua Yi Xue Za Zhi 2016; 96:2375-2379. [PMID: 27545027 DOI: 10.3760/cma.j.issn.0376-2491.2016.30.003] [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: 06/06/2023]
Abstract
OBJECTIVE To analyze subtypes of the clinical presentation of moderate-to-severe obstructive sleep apnea syndrome (OSAS) by cluster analysis and to explore its significance. METHODS A retrospective analysis was performed on the data of adult moderate-to-severe OSAS patients, which were diagnosed in Respiratory Department, Renmin Hospital of Wuhan University from October 2012 to October 2015. Fifteen kinds of clinical presentations were included in the cluster analysis, and analysis of characteristic of each cluster was then performed after category. RESULTS Patients were classified as three distinct clusters. They were identified as "daytime sleepiness group" , "night insomnia group" and "minimally symptomatic group" , consisting of 450 cases (44.64%), 351 cases (34.82%) and 207 cases (20.54%) of the entire cohort. Members in daytime sleepiness group had the highest probability of daytime sleepiness, tiredness, irritableness and the highest Epworth Sleeping Scale score[329 cases (73.11%), 280 cases (62.22%), 223 cases (49.56%) and (13.50±4.93) points], members in night insomnia group had the highest probability of complaining of insomnia, nocturia, night sweats, apnea and awakening[177 cases (50.43%), 157 cases (44.73%), 130 cases (37.04%), 296 cases (84.33%), 182 cases (51.85%)], the probability of having typical symptoms above was the lowest in minimally symptomatic group, but these patients were more likely to have related comorbidities: hypertension, coronary heart disease, arrhythmia, chronic obstructive pulmonary disease and gastroesophageal reflux disease[118 cases (57.00%), 41 cases (19.81%), 44 cases (21.26%), 34 cases (16.43%), 38 cases (18.36%)]; all above results were significantly higher than the other two groups (P<0.012 5). The rate of diabetes in minimally symptomatic group[28 cases (13.53%)]was also higher but the difference was not statistical significance. CONCLUSION Cluster analysis contributes to classify multiple clinical presentations of OSAS patients, which has important significance for recognizing disease heterogeneity and early diagnosis.
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Affiliation(s)
- S Tang
- Respiratory Department, Renmin Hospital of Wuhan University, Wuhan 430060, China
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Zhou XF, Ding ZS, Fang DB, Wang JF, Chen X, Fang ZL, Liu NB. [Selective bladder preservation in muscle-invasive bladder cancer by transurethral resection combined with intravesical instillation therapy: analysis of clinical effect in the elderly]. Zhonghua Yi Xue Za Zhi 2016; 96:1278-80. [PMID: 27122461 DOI: 10.3760/cma.j.issn.0376-2491.2016.16.011] [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 therapeutic effect and quality of life in elderly patients of muscle-invasive bladder cancer by transurethral resection combined with intravesical instillation therapy. METHODS From January 2005 to January 2015, 136 cases were diagnosed with T2 bladder cancer by transurethralplasmakinetic therapy or transurethral laser therapy. The data of 136 cases were analyzed retrospectively. RESULTS In transurethralplasmakinetic therapy group, the overall survival rate was 73.3%, the cancer-specific survival rate was 85.6%, the average survival time were 65 months. In transurethral laser therapy group, the overall survival rate was 73.9%, the cancer-specific survivalrate was 87.2%, the average survival time were 70 months. Two methods also can improve the patient's quality of life. CONCLUSION For the aged with invasive bladder cancer (T2), we could try the transurethral resection combined with intravesical instillation therapy.
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Affiliation(s)
- X F Zhou
- Department of Urology, China-Japan Friendship Hospital, Beijing 100029, China
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Wo J, Kong D, Brock NL, Xu F, Zhou X, Deng Z, Lin S. Transformation of Streptonigrin to Streptonigrone: Flavin Reductase-Mediated Flavin-Catalyzed Concomitant Oxidative Decarboxylation of Picolinic Acid Derivatives. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00154] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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)
- Jing Wo
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Dekun Kong
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Nelson L. Brock
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Fei Xu
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xiufen Zhou
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Shuangjun Lin
- State Key Laboratory of Microbial Metabolism, Joint International Laboratory on Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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Zhao M, Deng Z, Tang J, Zhou X, Chen Z, Li X, Yang L, Ma LJ. 2-(1-Pyrenyl) benzimidazole as a ratiometric and “turn-on” fluorescent probe for iron(iii) ions in aqueous solution. Analyst 2016; 141:2308-12. [DOI: 10.1039/c5an02565f] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A fluorescent probe for Fe3+, 2-(1-pyrenyl) benzimidazole (L), was synthesized. In aqueous solution, L shows a highly selective and sensitive ratiometric probe for Fe3+ in emission spectra, and it can also be used as a fluorescent “turn-on” probe for Fe3+ in excitation spectra.
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Affiliation(s)
- Meili Zhao
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Zhifu Deng
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Jian Tang
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Xiufen Zhou
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Zhi Chen
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Xutian Li
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Liting Yang
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
| | - Li-Jun Ma
- School of Chemistry and Environment
- South China Normal University
- Shipai
- P. R. China
- Guangzhou Key Laboratory of Materials for Energy Conversion and Storage
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Abstract
We report the quantification of partial ion insertion into individual 7,7,8,8-tetracyanoquinodimethane nanoparticles. It is shown that both potassium and sodium ions can be inserted into single TCNQ nanoparticles from aqueous solution. The extent of both potassium and sodium insertion into individual nanoparticles is quantitatively measured and shown to be partial and sodium ion shows a higher extent of insertion. The insertion process is inferred to be limited and controlled by the formation of a thin shell of salt, Na(+)/K(+) TCNQ˙(-) formed at the surface of the nanoparticle.
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Affiliation(s)
- X F Zhou
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
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Li F, Liang J, Wang W, Zhou X, Deng Z, Wang Z. Two nucleoside receptors from Streptomyces coelicolor: expression of the genes and characterization of the recombinant proteins. Protein Expr Purif 2015; 109:40-6. [PMID: 25680770 DOI: 10.1016/j.pep.2015.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/06/2015] [Accepted: 02/03/2015] [Indexed: 11/19/2022]
Abstract
Streptomyces coelicolor is a soil-dwelling bacterium that undergoes an intricate, saprophytic lifecycle. The bacterium takes up exogenous nucleosides for nucleic acid synthesis or use as carbon and energy sources. However, nucleosides must pass through the membrane with the help of transporters. In the present work, the SCO4884 and SCO4885 genes were cloned into pCOLADuet-1 and overexpressed in Escherichia coli BL21. Each protein was monomeric. Using isothermal titration calorimetry, we determined that SCO4884 and SCO4885 are likely nucleoside receptors with affinity for adenosine and pyrimidine nucleosides. On the basis of bioinformatics analysis and the transporter classification system, we speculate that SCO4884-SCO4888 is an ABC-like transporter responsible for the uptake of adenosine and pyrimidine nucleosides.
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Affiliation(s)
- Fuhou Li
- State Key Laboratory of Microbial Metabolism, School of Life Science & Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China; School of Marine Science and Technology, Jiangsu Marine Resources Development Research Institute, Huaihai Institute of Technology, Lianyungang, Jiangsu Province 222005, People's Republic of China
| | - Jingdan Liang
- State Key Laboratory of Microbial Metabolism, School of Life Science & Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China
| | - Weixia Wang
- School of Marine Science and Technology, Jiangsu Marine Resources Development Research Institute, Huaihai Institute of Technology, Lianyungang, Jiangsu Province 222005, People's Republic of China
| | - Xiufen Zhou
- State Key Laboratory of Microbial Metabolism, School of Life Science & Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, School of Life Science & Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China.
| | - Zhijun Wang
- State Key Laboratory of Microbial Metabolism, School of Life Science & Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China.
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Li F, Liang J, Wang W, Zhou X, Deng Z, Wang Z. Analysis of Streptomyces coelicolor membrane proteome using two-dimensional native/native and native/sodium dodecyl sulfate gel electrophoresis. Anal Biochem 2014; 465:148-55. [DOI: 10.1016/j.ab.2014.08.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2014] [Revised: 08/05/2014] [Accepted: 08/07/2014] [Indexed: 10/24/2022]
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Cao B, Chen C, DeMott MS, Cheng Q, Clark TA, Xiong X, Zheng X, Butty V, Levine SS, Yuan G, Boitano M, Luong K, Song Y, Zhou X, Deng Z, Turner SW, Korlach J, You D, Wang L, Chen S, Dedon PC. Genomic mapping of phosphorothioates reveals partial modification of short consensus sequences. Nat Commun 2014; 5:3951. [PMID: 24899568 DOI: 10.1038/ncomms4951] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2013] [Accepted: 04/25/2014] [Indexed: 01/29/2023] Open
Abstract
Bacterial phosphorothioate (PT) DNA modifications are incorporated by Dnd proteins A-E and often function with DndF-H as a restriction-modification (R-M) system, as in Escherichia coli B7A. However, bacteria such as Vibrio cyclitrophicus FF75 lack dndF-H, which points to other PT functions. Here we report two novel, orthogonal technologies to map PTs across the genomes of B7A and FF75 with >90% agreement: single molecule, real-time sequencing and deep sequencing of iodine-induced cleavage at PT (ICDS). In B7A, we detect PT on both strands of GpsAAC/GpsTTC motifs, but with only 12% of 40,701 possible sites modified. In contrast, PT in FF75 occurs as a single-strand modification at CpsCA, again with only 14% of 160,541 sites modified. Single-molecule analysis indicates that modification could be partial at any particular genomic site even with active restriction by DndF-H, with direct interaction of modification proteins with GAAC/GTTC sites demonstrated with oligonucleotides. These results point to highly unusual target selection by PT-modification proteins and rule out known R-M mechanisms.
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Affiliation(s)
- Bo Cao
- 1] State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200233, China [2] Department of Biological Engineering, Center for Environmental Health Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [3]
| | - Chao Chen
- 1] Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education and School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China [2]
| | - Michael S DeMott
- 1] Department of Biological Engineering, Center for Environmental Health Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2]
| | - Qiuxiang Cheng
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200233, China
| | - Tyson A Clark
- Pacific Biosciences, Menlo Park, California 94025, USA
| | - Xiaolin Xiong
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education and School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Xiaoqing Zheng
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200233, China
| | - Vincent Butty
- Department of Biological Engineering, Center for Environmental Health Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Stuart S Levine
- Department of Biological Engineering, Center for Environmental Health Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - George Yuan
- Pacific Biosciences, Menlo Park, California 94025, USA
| | | | - Khai Luong
- Pacific Biosciences, Menlo Park, California 94025, USA
| | - Yi Song
- Pacific Biosciences, Menlo Park, California 94025, USA
| | - Xiufen Zhou
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200233, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200233, China
| | | | - Jonas Korlach
- Pacific Biosciences, Menlo Park, California 94025, USA
| | - Delin You
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200233, China
| | - Lianrong Wang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education and School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Shi Chen
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education and School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Peter C Dedon
- Department of Biological Engineering, Center for Environmental Health Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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An X, Zhou X, Wang Z, Deng Z, Liang J. [Cloning, expression and purification of dptC, a DNA phosphorothioate modification related gene from Salmonella enteric serovar Cerro 87]. Wei Sheng Wu Xue Bao 2013; 53:1111-1116. [PMID: 24409767] [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: 06/03/2023]
Abstract
OBJECTIVE DNA phosphorothioate modification means substituting a non-bridging oxygen with a sulfur in DNA. The modification endows DNA with such chemical property that protects the hosting bacteria against peroxide. The modification is controlled by a dnd gene cluster. Salmonella entericaserovar Cerro 87 is one of the bacteria that harbor the DNA phosphorothioate modification. The modification is carried out by dptB, C, DandE. Ourstudy is designed to clone and express dptC, to optimize the expressing condition, and then to purify the DptC. METHODS dptC DNA fragment was amplified by KOD PCR with the special primers and S. entericaserovar Cerro 87 genomic DNA template. A fusion expression vector pJTU3622 was constructed by inserting the dptC DNA fragment into pGEX-6P-1 inSmaI and XhoI sites. The positive clone was verified by antibiotics resistance gene screening and sequenced, and then transferred into host strain E. coli BL21 (DE3) pLysS to producean engineering bacterium Anxh103. After optimizing the expression condition for dptC, we purified DptC from Anxh103 by Aikta FPLC with a GST-Trap column. RESULTS A fusion expression vector pJTU3622 and an engineering bacterium Anxh103 were produced. The optimizing expressing condition for dptC is as follows: induced at 18 degrees C for 8 - 18 h; 0.6 mmol/L IPTG, LB with 50 micromol/L Fe2+. CONCLUSION The anchor redeemed for high throughput expression of dptC. The TEV site in pJTU3622 made the process of purifying DptC easier and simpler. This helps lay the ground work for future study on the function of DptC. Also, the light brown color of DptC and the medium with 50 micromol/L Fe2+ showed us DptC has the same character with DndC which belongs to an iron-sufur protein with 4Fe - 4S.
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Affiliation(s)
- Xianhui An
- Jiangsu Key Laboratory of Marine Biotechnology, Huaihai Institute of Technology, Lianyungang 222005, China.
| | - Xiufen Zhou
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhijun Wang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jingdan Liang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
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Gou L, Wu Q, Lin S, Li X, Liang J, Zhou X, An D, Deng Z, Wang Z. Mutasynthesis of pyrrole spiroketal compound using calcimycin 3-hydroxy anthranilic acid biosynthetic mutant. Appl Microbiol Biotechnol 2013; 97:8183-91. [PMID: 23666477 DOI: 10.1007/s00253-013-4882-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 03/05/2013] [Accepted: 03/24/2013] [Indexed: 11/30/2022]
Abstract
The five-membered aromatic nitrogen heterocyclic pyrrole ring is a building block for a wide variety of natural products. Aiming at generating new pyrrole-containing derivatives as well as to identify new candidates that may be of value in designing new anticancer, antiviral, and/or antimicrobial agents, we employed a strategy on pyrrole-containing compound mutasynthesis using the pyrrole-containing calcimycin biosynthetic gene cluster. We blocked the biosynthesis of the calcimycin precursor, 3-hydroxy anthranilic acid, by deletion of calB1-3 and found that two intermediates containing the pyrrole and the spiroketal moiety were accumulated in the culture. We then fed the mutant using the structurally similar compound of 3-hydroxy anthranilic acid. At least four additional new pyrrole spiroketal derivatives were obtained. The structures of the intermediates and the new pyrrole spiroketal derivatives were identified using LC-MS and NMR. One of them shows enhanced antibacterial activity. Our work shows a new way of pyrrole derivative biosynthetic mutasynthesis.
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Affiliation(s)
- Lixia Gou
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shannxi, 712100, China
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Wu Q, Gou L, Lin S, Liang J, Yin J, Zhou X, Bai L, An D, Deng Z, Wang Z. Characterization of the N-methyltransferase CalM involved in calcimycin biosynthesis by Streptomyces chartreusis NRRL 3882. Biochimie 2013; 95:1487-93. [PMID: 23583975 DOI: 10.1016/j.biochi.2013.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Accepted: 03/27/2013] [Indexed: 12/21/2022]
Abstract
Calcimycin is a rare divalent cation specific ionophore antibiotic that has many biochemical and pharmaceutical applications. We have recently cloned and sequenced the Streptomyces chartreusis calcimycin biosynthesis gene cluster as well as identified the genes required for the synthesis of the polyketide backbone of calcimycin. Additional modifying or decorating enzymes are required to convert the polyketide backbone into the biologically active calcimycin. Using targeted mutagenesis of Streptomyces we were able to show that calM from the calcimycin biosynthesis gene cluster is required for calcimycin production. Inactivating calM by PCR targeting, caused high level accumulation of N-demethyl calcimycin. CalM in the presence of S-adenosyl-L-methionine converted N-demethyl calcimycin to calcimycin in vitro. The enzyme was determined to have a kinetic parameter of Km 276 μM, kcat 1.26 min(-1) and kcat/Km 76.2 M(-1) s(-1). These results proved that CalM is a N-methyltransferase that is required for calcimycin biosynthesis, and they set the stage for generating much desired novel calcimycin derivatives by rational genetic and chemical engineering.
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Affiliation(s)
- Qiulin Wu
- State Key Laboratory of Microbial Metabolism, School of Life Science & Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China
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Si-Tu J, Lu MH, Li LY, Sun QP, Zhou XF, Qiu JG, Gao X. Prospective evaluation of pentafecta outcomes at 5 years after laparoscopic radical prostatectomy: results of 170 patients at a single center. Neoplasma 2013; 60:309-14. [PMID: 23374001 DOI: 10.4149/neo_2013_041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A new and more comprehensive methodology for reporting outcomes after radical prostatectomy (RP) has been proposed: the so-called pentafecta. However, no prior studies reported intermediate- and long-term pentafecta outcomes after laparoscopic RP. We collected prospectively the clinical data of 170 consecutive patients with a minimum 60-month follow-up undergoing laparoscopic RP for clinically localized prostate cancer. International Consultation on Incontinence Questionnaire-Urinary Incontinence Short Form and the Sexual Health Inventory for Men score were used to evaluate the functional outcomes. Logistic regression was used to perform univariable and multivariable analyses. Sixty months after surgery, a pentafecta outcome was achieved by 124 patients (72.9%). On univariable regression analysis, patient age at surgery (P<0.001), body mass index (P=0.031), pathological T stage (P<0.001) and prostate volume (P=0.003) were significantly associated with pentafecta rates. On multivariable analysis, only patient age at surgery (odds ratio 0.95; P=0.006) and pathological T stage (odds ratio 0.82; P<0.001) were independent predictors of pentafecta rates. Using validated questionnaires to assess functional outcomes, for the first time, we evaluated pentafecta outcomes at 5 years after laparoscopic RP. This approach may be beneficial and could be used when counseling patients with clinically localized prostate cancer.
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Affiliation(s)
- J Si-Tu
- Department of Urology, Sun Yat-sen University, Guangzhou, China
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34
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An X, Zhou X, Wang Z, Deng Z, Liang J. [Mutagenesis of cysteine residues in dptC from Salmonella enteric serovar Cerro 87 and its effects on DNA phosphorothioate modification]. Wei Sheng Wu Xue Bao 2013; 53:204-209. [PMID: 23627113] [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: 06/02/2023]
Abstract
OBJECTIVE DNA phosphorothioate modification (DNA sulfur modification, a non-bridging oxygen swapped with a sulfur) exists in diverse bacteria. Salmonella enterica serovar Cerro 87 is one of the bacteria that harbor the DNA sulfur modification. The modification is carried out by the products of a four-membered gene cluster, dptBCDE. Transformation of Escherichia coli DH10B with the dptBCDE gene cluster endows the strain with DNA sulfur modification capability. Deletion of dptC abolished the modification. Here, we studied the function of dptC in DNA sulfur modification. METHODS Six cysteine residues in dptC were mutated individually within the dptBCDE gene cluster. Mutants were then tested for DNA sulfur modification. RESULTS Among the 6 cysteine mutations (C39, C146, C262, C273, C280, and C283), 5 abolished DNA modification except for C39, suggesting that C146, C262, C273, C280, and C283 are essential for DNA sulfur modification. Sequence alignment shows that these five cysteine residues are conserved among different strains. CONCLUSION Mutation at anyone of C146, C262, C273, C280 and C283 of dptC abolished DNA modification. Our results shed light on further study of DNA sulfur modification biochemical pathway.
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Affiliation(s)
- Xianhui An
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
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An X, Xiong W, Yang Y, Li F, Zhou X, Wang Z, Deng Z, Liang J. A novel target of IscS in Escherichia coli: participating in DNA phosphorothioation. PLoS One 2012; 7:e51265. [PMID: 23240007 PMCID: PMC3519819 DOI: 10.1371/journal.pone.0051265] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Accepted: 10/30/2012] [Indexed: 11/18/2022] Open
Abstract
Many bacterial species modify their DNA with the addition of sulfur to phosphate groups, a modification known as DNA phosphorothioation. DndA is known to act as a cysteine desulfurase, catalyzing a key biochemical step in phosphorothioation. However, bioinformatic analysis revealed that 19 out of the 31 known dnd gene clusters, contain only four genes (dndB-E), lacking a key cysteine desulfurase corresponding gene. There are multiple cysteine desulfurase genes in Escherichia coli, but which one of them participates into DNA phosphorothioation is unknown. Here, by employing heterologous expression of the Salmonella enterica dnd gene cluster named dptBCDE in three E. coli mutants, each of which lacked a different cysteine desulfurase gene, we show that IscS is the only cysteine desulfurase that collaborates with dptB-E, resulting in DNA phosphorothioation. Using a bacterial two-hybrid system, protein interactions between IscS and DptC, and IscS and DptE were identified. Our findings revealed IscS as a key participant in DNA phosphorothioation and lay the basis for in-depth analysis of the DNA phosphorothioation biochemical pathway.
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Affiliation(s)
- Xianhui An
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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Wu H, Qu S, Lu C, Zheng H, Zhou X, Bai L, Deng Z. Genomic and transcriptomic insights into the thermo-regulated biosynthesis of validamycin in Streptomyces hygroscopicus 5008. BMC Genomics 2012; 13:337. [PMID: 22827618 PMCID: PMC3424136 DOI: 10.1186/1471-2164-13-337] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [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: 03/21/2012] [Accepted: 07/24/2012] [Indexed: 01/11/2023] Open
Abstract
Background Streptomyces hygroscopicus 5008 has been used for the production of the antifungal validamycin/jinggangmycin for more than 40 years. A high yield of validamycin is achieved by culturing the strain at 37°C, rather than at 30°C for normal growth and sporulation. The mechanism(s) of its thermo-regulated biosynthesis was largely unknown. Results The 10,383,684-bp genome of strain 5008 was completely sequenced and composed of a linear chromosome, a 164.57-kb linear plasmid, and a 73.28-kb circular plasmid. Compared with other Streptomyces genomes, the chromosome of strain 5008 has a smaller core region and shorter terminal inverted repeats, encodes more α/β hydrolases, major facilitator superfamily transporters, and Mg2+/Mn2+-dependent regulatory phosphatases. Transcriptomic analysis revealed that the expression of 7.5% of coding sequences was increased at 37°C, including biosynthetic genes for validamycin and other three secondary metabolites. At 37°C, a glutamate dehydrogenase was transcriptionally up-regulated, and further proved its involvement in validamycin production by gene replacement. Moreover, efficient synthesis and utilization of intracellular glutamate were noticed in strain 5008 at 37°C, revealing glutamate as the nitrogen source for validamycin biosynthesis. Furthermore, a SARP-family regulatory gene with enhanced transcription at 37°C was identified and confirmed to be positively involved in the thermo-regulation of validamycin production by gene inactivation and transcriptional analysis. Conclusions Strain 5008 seemed to have evolved with specific genomic components to facilitate the thermo-regulated validamycin biosynthesis. The data obtained here will facilitate future studies for validamycin yield improvement and industrial bioprocess optimization.
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Affiliation(s)
- Hang Wu
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200030, China
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Xie X, Liang J, Pu T, Xu F, Yao F, Yang Y, Zhao YL, You D, Zhou X, Deng Z, Wang Z. Phosphorothioate DNA as an antioxidant in bacteria. Nucleic Acids Res 2012; 40:9115-24. [PMID: 22772986 PMCID: PMC3467049 DOI: 10.1093/nar/gks650] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [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] [Indexed: 02/03/2023] Open
Abstract
Diverse bacteria contain DNA with sulfur incorporated stereo-specifically into their DNA backbone at specific sequences (phosphorothioation). We found that in vitro oxidation of phosphorothioate (PT) DNA by hydrogen peroxide (H(2)O(2)) or peracetic acid has two possible outcomes: DNA backbone cleavage or sulfur removal resulting in restoration of normal DNA backbone. The physiological relevance of this redox reaction was investigated by challenging PT DNA hosting Salmonella enterica cells using H(2)O(2). DNA phosphorothioation was found to correlate with increasing resistance to the growth inhibition by H(2)O(2). Resistance to H(2)O(2) was abolished when each of the three dnd genes, required for phosphorothioation, was inactivated. In vivo, PT DNA is more resistant to the double-strand break damage caused by H(2)O(2) than PT-free DNA. Furthermore, sulfur on the modified DNA was consumed and the DNA was converted to PT-free state when the bacteria were incubated with H(2)O(2). These findings are consistent with a hypothesis that phosphorothioation modification endows DNA with reducing chemical property, which protects the hosting bacteria against peroxide, explaining why this modification is maintained by diverse bacteria.
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Affiliation(s)
- Xinqiang Xie
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiaotong University, Shanghai 200030, People's Republic of China
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Tam Tam S, Bastian I, Zhou XF, Vander Hoek M, Michael MZ, Gibbins IL, Haberberger RV. MicroRNA-143 expression in dorsal root ganglion neurons. Cell Tissue Res 2011; 346:163-73. [PMID: 22048787 DOI: 10.1007/s00441-011-1263-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2011] [Accepted: 10/06/2011] [Indexed: 12/20/2022]
Abstract
The unpleasant sensory and emotional experience of pain is initiated by excitation of primary afferent nociceptive neurons. Nerve damage or inflammation induces changes in nociceptive DRG neurons which contribute to both peripheral and central sensitization of pain-sensitive pathways. Recently, blockade of microRNA synthesis has been found to modulate the response of nociceptive neurons to inflammatory stimuli. However, little is known about the contributions of individual miRNAs to painful conditions. We compared miRNA expression in mouse sensory neurons and focussed on the localisation and control of miR-143. Using miRNA-arrays we compared the microRNA expression profile of intact lumbar DRG with one-day-old DRG cultures and found that nine miRNAs including miR-143 showed lower expression levels in cultures. Subsequent RT-qPCR confirmed array data and in-situ hybridisation localised miR-143 in the cytosol of sensory DRG neurons in situ and in vitro. Analysis of microbead-enriched neuron cultures showed significantly higher expression levels of miR-143 in isolectin B4 (I-B4) binding sensory neurons compared with neurons in the I-B4 negative flow-through fraction. In animal models of peripheral inflammation (injection of Complete Freund's Adjuvant, CFA) and nerve damage (transection of the sciatic nerve), we found that expression levels of miR-143 were significantly lower in DRGs ipsilateral to CFA injection or after nerve damage. Taken together, our data demonstrate for the first time miR-143 expression in nociceptive neurons. Since expression levels of miR-143 were higher in I-B4 positive neurons and declined in response to inflammation but not axotomy, miR-143 could selectively contribute to mRNA regulation in specific populations of nociceptors.
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Affiliation(s)
- S Tam Tam
- Department of Anatomy & Histology, Flinders University of South Australia, Adelaide, SA, Australia
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Zhou X, Wu H, Li Z, Zhou X, Bai L, Deng Z. Over-expression of UDP-glucose pyrophosphorylase increases validamycin A but decreases validoxylamine A production in Streptomyces hygroscopicus var. jinggangensis 5008. Metab Eng 2011; 13:768-76. [PMID: 22008983 DOI: 10.1016/j.ymben.2011.10.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2011] [Revised: 10/02/2011] [Accepted: 10/04/2011] [Indexed: 11/18/2022]
Abstract
During the fermentation of Streptomyces hygroscopicus TL01 to produce validamycin A (18 g/L), a considerable amount of an intermediate validoxylamine A (4.0 g/L) is accumulated. Chemical or enzymatic hydrolysis of validamycin A was not observed during the fermentation process. Over-expression of glucosyltransferase ValG in TL01 did not increase the efficiency of glycosylation. However, increased validamycin A and decreased validoxylamine A production were observed in both the cell-free extract and fermentation broth of TL01 supplemented with a high concentration of UDP-glucose. The enzymatic activity of UDP-glucose pyrophosphorylase (Ugp) in TL01, which catalyzes UDP-glucose formation, was found to be much lower than the activities of other enzymes involved in the biosynthesis of UDP-glucose and the glucosyltransferase ValG. An ugp gene was cloned from S. hygroscopicus 5008 and verified to code for Ugp. In TL01 with an extra copy of ugp, the transcription of ugp was increased for 1.5 times, and Ugp activity was increased by 100%. Moreover, 22 g/L validamycin A and 2.5 g/L validoxylamine A were produced, and the validamycin A/validoxylamine A ratio was increased from 3.15 in TL01 to 5.75. These data prove that validamycin A biosynthesis is limited by the supply of UDP-glucose, which can be relieved by Ugp over-expression.
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Affiliation(s)
- Xiang Zhou
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
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Qiu J, Zhuo Y, Zhu D, Zhou X, Zhang L, Bai L, Deng Z. Overexpression of the ABC transporter AvtAB increases avermectin production in Streptomyces avermitilis. Appl Microbiol Biotechnol 2011; 92:337-45. [DOI: 10.1007/s00253-011-3439-4] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 04/09/2011] [Accepted: 06/11/2011] [Indexed: 11/24/2022]
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Zhou XF, Dai CM, Zhang YL, Surampalli RY, Zhang TC. A preliminary study on the occurrence and behavior of carbamazepine (CBZ) in aquatic environment of Yangtze River Delta, China. Environ Monit Assess 2011; 173:45-53. [PMID: 20213064 DOI: 10.1007/s10661-010-1369-8] [Citation(s) in RCA: 20] [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] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 02/11/2010] [Indexed: 05/13/2023]
Abstract
The occurrence and behavior of carbamazepine (CBZ) was investigated in aquatic environment of Yangtze River Delta, East China. The water samples were enriched by solid-phase extraction and analyzed by high-performance liquid chromatography with diode array detector. The validation of the analytical method included linearity (0.1-1 mg/L), recovery studies, and determination of limits of quantification. Limits of quantification of CBZ in various aquatic samples were in the range of 0.1-0.2 μg/L. CBZ was detected in the Tongji University Intramural River, the Huangpu River, and the Suzhou River with the highest concentration of 1,090 ng/L, but not detected in the Nanhengyin River and the Caojia River. In sewage water samples, CBZ was not detected in one of the sewage treatment plants (STPs) but was detected in the raw influents and effluents at the other three selected STPs in Shanghai, with the concentrations ranging from 230 to 1,110 ng/L. CBZ was not completely eliminated after secondary treatment (with the active sludge process).
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Affiliation(s)
- X F Zhou
- Key Laboratory of Yangtze Water Environment of Ministry of Education, Tongji University, Shanghai, 200092, China.
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Cheng L, Chen W, Zhai L, Xu D, Huang T, Lin S, Zhou X, Deng Z. Identification of the genecluster involved in muraymycin biosynthesis from Streptomyces sp. NRRL 30471. ACTA ACUST UNITED AC 2011; 7:920-7. [DOI: 10.1039/c0mb00237b] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Liu G, Ou HY, Wang T, Li L, Tan H, Zhou X, Rajakumar K, Deng Z, He X. Cleavage of phosphorothioated DNA and methylated DNA by the type IV restriction endonuclease ScoMcrA. PLoS Genet 2010; 6:e1001253. [PMID: 21203499 PMCID: PMC3009677 DOI: 10.1371/journal.pgen.1001253] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Accepted: 11/18/2010] [Indexed: 01/13/2023] Open
Abstract
Many taxonomically diverse prokaryotes enzymatically modify their DNA by replacing a non-bridging oxygen with a sulfur atom at specific sequences. The biological implications of this DNA S-modification (phosphorothioation) were unknown. We observed that simultaneous expression of the dndA-E gene cluster from Streptomyces lividans 66, which is responsible for the DNA S-modification, and the putative Streptomyces coelicolor A(3)2 Type IV methyl-dependent restriction endonuclease ScoA3McrA (Sco4631) leads to cell death in the same host. A His-tagged derivative of ScoA3McrA cleaved S-modified DNA and also Dcm-methylated DNA in vitro near the respective modification sites. Double-strand cleavage occurred 16–28 nucleotides away from the phosphorothioate links. DNase I footprinting demonstrated binding of ScoA3McrA to the Dcm methylation site, but no clear binding could be detected at the S-modified site under cleavage conditions. This is the first report of in vitro endonuclease activity of a McrA homologue and also the first demonstration of an enzyme that specifically cleaves S-modified DNA. Bacteria frequently exchange genetic information among themselves. DNA from one species can be transferred efficiently to unrelated microbes. Bacteria have developed systems that restrict gene transfer. Many restriction systems recognize and destroy foreign DNA entering the cells, but there are also enzymes inducing suicide of cells that have been invaded by foreign genes that modify the host DNA. We describe a restriction endonuclease from an antibiotic-producing soil bacterium that cuts foreign methylated DNA and also foreign DNA containing sulfur. DNA sulfur modification occurs in diverse medically or industrially important microbes and has been shown to prevent cleavage of DNA. The most similar enzyme in the databases is the putative restriction endonuclease McrA from Escherichia coli which has not been observed to cleave DNA in a test tube. Our endonuclease showed no activity with magnesium, but it cleaved DNA in the presence of manganese ions. Therefore, we present two novelties: an unusual restriction endonuclease that cleaves sulfur-modified DNA and conditions that allow the study of the enzyme in a test tube.
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Affiliation(s)
- Guang Liu
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Hong-Yu Ou
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Tao Wang
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Li Li
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Huarong Tan
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Xiufen Zhou
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Kumar Rajakumar
- Department of Infection, Immunity, and Inflammation, Leicester Medical School, University of Leicester, Leicester, United Kingdom
- Department of Clinical Microbiology, University Hospitals of Leicester National Health Service Trust, Leicester, United Kingdom
| | - Zixin Deng
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
- * E-mail: (XH); (ZD) (ZD)
| | - Xinyi He
- Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
- * E-mail: (XH); (ZD) (ZD)
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Abstract
A novel, site-specific, DNA backbone S-modification (phosphorothioation) has been discovered, but its in vivo function(s) have remained obscure. Here, we report that the enteropathogenic Salmonella enterica serovar Cerro 87, which possesses S-modified DNA, restricts DNA isolated from Escherichia coli, while protecting its own DNA by site-specific phosphorothioation. A cloned 15-kb gene cluster from S. enterica conferred both host-specific restriction and DNA S-modification on E. coli. Mutational analysis of the gene cluster proved unambiguously that the S-modification prevented host-specific restriction specified by the same gene cluster. Restriction activity required three genes in addition to at least four contiguous genes necessary for DNA S-modification. This functional overlap ensures that restriction of heterologous DNA occurs only when the host DNA is protected by phosphorothioation. Meanwhile, this novel type of host-specific restriction and modification system was identified in many diverse bacteria. As in the case of methylation-specific restriction systems, targeted inactivation of this gene cluster should facilitate genetic manipulation of these bacteria, as we demonstrate in Salmonella.
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Affiliation(s)
- Tiegang Xu
- Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
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Zhao C, Coughlin JM, Ju J, Zhu D, Wendt-Pienkowski E, Zhou X, Wang Z, Shen B, Deng Z. Oxazolomycin biosynthesis in Streptomyces albus JA3453 featuring an "acyltransferase-less" type I polyketide synthase that incorporates two distinct extender units. J Biol Chem 2010; 285:20097-108. [PMID: 20406823 DOI: 10.1074/jbc.m109.090092] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The oxazolomycins (OZMs) are a growing family of antibiotics produced by several Streptomyces species that show diverse and important antibacterial, antitumor, and anti-human immunodeficiency virus activity. Oxazolomycin A is a peptide-polyketide hybrid compound containing a unique spiro-linked beta-lactone/gamma-lactam, a 5-substituted oxazole ring. The oxazolomycin biosynthetic gene cluster (ozm) was identified from Streptomyces albus JA3453 and localized to 79.5-kb DNA, consisting of 20 open reading frames that encode non-ribosomal peptide synthases, polyketide synthases (PKSs), hybrid non-ribosomal peptide synthase-PKS, trans-acyltransferases (trans-ATs), enzymes for methoxymalonyl-acyl carrier protein (ACP) synthesis, putative resistance genes, and hypothetical regulation genes. In contrast to classical type I polyketide or fatty acid biosynthases, all 10 PKS modules in the gene cluster lack cognate ATs. Instead, discrete ATs OzmM (with tandem domains OzmM-AT1 and OzmM-AT2) and OzmC were equipped to carry out all of the loading functions of both malonyl-CoA and methoxymalonyl-ACP extender units. Strikingly, only OzmM-AT2 is required for OzmM activity for OZM biosynthesis, whereas OzmM-AT1 seemed to be a cryptic AT domain. The above findings, together with previous results using isotope-labeled precursor feeding assays, are assembled for the OZM biosynthesis model to be proposed. The incorporation of both malonyl-CoA (by OzmM-AT2) and methoxymalonyl-ACP (by OzmC) extender units seemed to be unprecedented for this class of trans-AT type I PKSs, which might be fruitfully manipulated to create structurally diverse novel compounds.
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Affiliation(s)
- Chunhua Zhao
- Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiaotong University, Shanghai 200030, China
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Liang J, Niu Q, Xu X, Luo Y, Zhou X, Deng Z, Wang Z. Effective elimination of nucleic acids from bacterial protein samples for optimized blue native polyacrylamide gel electrophoresis. Electrophoresis 2009; 30:2454-9. [DOI: 10.1002/elps.200900026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Qu F, Zhou X, Xu J, Li H, Xie G. Luminescence switching of CdTe quantum dots in presence of p-sulfonatocalix[4]arene to detect pesticides in aqueous solution. Talanta 2009; 78:1359-63. [DOI: 10.1016/j.talanta.2009.02.013] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 02/05/2009] [Accepted: 02/09/2009] [Indexed: 11/17/2022]
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Xu T, Liang J, Chen S, Wang L, He X, You D, Wang Z, Li A, Xu Z, Zhou X, Deng Z. DNA phosphorothioation in Streptomyces lividans: mutational analysis of the dnd locus. BMC Microbiol 2009; 9:41. [PMID: 19232083 PMCID: PMC2653506 DOI: 10.1186/1471-2180-9-41] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [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: 10/23/2008] [Accepted: 02/20/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A novel DNA phosphorothioate modification (DNA sulfur modification), in which one of the non-bridging oxygen atoms in the phosphodiester bond linking DNA nucleotides is exchanged by sulphur, was found to be genetically determined by dnd or dnd-counterpart loci in a wide spectrum of bacteria from diverse habitats. A detailed mutational analysis of the individual genes within the dnd locus in Streptomyces lividans responsible for DNA phosphorothioation was performed and is described here. It should be of great help for the mechanistic study of this intriguing system. RESULTS A 6,665-bp DNA region carrying just five ORFs (dndA-E) was defined as the sole determinant for modification of the DNA backbone in S. lividans to form phosphorothioate. This provides a diagnostically reliable and easily assayable Dnd (DNA degradation) phenotype. While dndA is clearly transcribed independently, dndB-E constitute an operon, as revealed by RT-PCR analysis. An efficient mutation-integration-complementation system was developed to allow for detailed functional analysis of these dnd genes. The Dnd- phenotype caused by specific in-frame deletion of the dndA, C, D, and E genes or the enhanced Dnd phenotype resulting from in-frame deletion of dndB could be restored by expression vectors carrying the corresponding dnd genes. Interestingly, overdosage of DndC or DndD, but not other Dnd proteins, in vivo was found to be detrimental to cell viability. CONCLUSION DNA phosphorothioation is a multi-enzymatic and highly coordinated process controlled by five dnd genes. Overexpression of some proteins in vivo prevented growth of host strain, suggesting that expression of the gene cluster is strictly regulated in the native host.
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Affiliation(s)
- Tiegang Xu
- Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiaotong University, Shanghai, PR China.
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Chen W, Huang T, He X, Meng Q, You D, Bai L, Li J, Wu M, Li R, Xie Z, Zhou H, Zhou X, Tan H, Deng Z. Characterization of the polyoxin biosynthetic gene cluster from Streptomyces cacaoi and engineered production of polyoxin H. J Biol Chem 2009; 284:10627-38. [PMID: 19233844 DOI: 10.1074/jbc.m807534200] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A gene cluster (pol) essential for the biosynthesis of polyoxin, a nucleoside antibiotic widely used for the control of phytopathogenic fungi, was cloned from Streptomyces cacaoi. A 46,066-bp region was sequenced, and 20 of 39 of the putative open reading frames were defined as necessary for polyoxin biosynthesis as evidenced by its production in a heterologous host, Streptomyces lividans TK24. The role of PolO and PolA in polyoxin synthesis was demonstrated by in vivo experiments, and their functions were unambiguously characterized as O-carbamoyltransferase and UMP-enolpyruvyltransferase, respectively, by in vitro experiments, which enabled the production of a modified compound differing slightly from that proposed earlier. These studies should provide a solid foundation for the elucidation of the molecular mechanisms for polyoxin biosynthesis, and set the stage for combinatorial biosynthesis using genes encoding different pathways for nucleoside antibiotics.
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Affiliation(s)
- Wenqing Chen
- Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiaotong University, Shanghai 200030, China
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50
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Yao F, Xu T, Zhou X, Deng Z, You D. Functional analysis of spfD gene involved in DNA phosphorothioation in Pseudomonas fluorescens Pf0-1. FEBS Lett 2009; 583:729-33. [PMID: 19171139 DOI: 10.1016/j.febslet.2009.01.029] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 01/13/2009] [Accepted: 01/14/2009] [Indexed: 10/21/2022]
Abstract
DNA phosphorothioation is widespread in many bacterial species. By homology analysis of the dnd gene cluster in Pseudomonas fluorescens Pf0-1, a spfBCDE gene cluster involved in DNA phosphorothioation was localized. Disruption of the spfD gene, a dndD homolog, caused the loss of the Dnd phenotype and demonstrated the involvement of spfD in DNA phosphorothioation in P. fluorescens Pf0-1. The ATPase activity of SpfD suggests that SpfD could hydrolyze ATP to provide the energy required in the DNA phosphorothioate modification process.
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Affiliation(s)
- Fen Yao
- Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China
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