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Li J, Yu L, Wang R, Lan J, Li M, Qiao Y, Tao Z, Lü H, Wang F, Fang Q, Guo P. The role of silver nanoparticles alone and combined with imipenem on carbapenem-resistant Klebsiella pneumoniae. J Appl Microbiol 2024; 135:lxae077. [PMID: 38544327 DOI: 10.1093/jambio/lxae077] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 03/11/2024] [Accepted: 03/26/2024] [Indexed: 05/07/2024]
Abstract
AIMS Carbapenem-resistant Klebsiella pneumoniae (CRKP) infections poses a significant threat to human health, necessitating urgent development of new antimicrobial agents. Silver nanoparticles (AgNPs), which are among the most widely used engineered nanomaterials, have been extensively studied. However, the impact of AgNPs on CRKP and the potential for drug resistance development remain inadequately explored. METHODS AND RESULTS In this study, broth dilution method was used to determine the minimum inhibitory concentration (MIC) was determined using the broth dilution method. Results indicated MIC values of 93.1 ± 193.3 µg ml-1 for AgNPs, 2.3 ± 5.1 µg ml-1 for AgNO3, and 25.1 ± 48.3 µg ml-1 for imipenem (IMI). The combined inhibitory effect of AgNPs and IMI on CRKP was assessed using the checkerboard method. Moreover, after 6-20 generations of continuous culture, the MIC value of AgNPs increased 2-fold. Compared to IMI, resistance of Kl. pneumoniae to AgNPs developed more slowly, with a higher fold increase in MIC observed after 20 generations. Whole-genome sequencing revealed four nonsynonymous single nucleotide polymorphism mutations in CRKP after 20 generations of AgNP treatment. CONCLUSION We have demonstrated that AgNPs significantly inhibit CRKP isolates and enhance the antibacterial activity of imipenem against Kl. pneumoniae. Although the development of AgNP resistance is gradual, continued efforts are necessary for monitoring and studying the mechanisms of AgNP resistance.
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Affiliation(s)
- Jiangyan Li
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
- Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Lian Yu
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Ruirui Wang
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Jiaqi Lan
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Ming Li
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Yan Qiao
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Zhaoyu Tao
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Hezuo Lü
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Fengchao Wang
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Qiang Fang
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Pu Guo
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
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Li J, Li M, Wang R, Lan J, Yu L, Gao J, Lü H, Fang Q, Wang F. Mitophagy protects against silver nanoparticle-induced hepatotoxicity by inhibiting mitochondrial ROS and the NLRP3 inflammasome. Ecotoxicol Environ Saf 2024; 273:116137. [PMID: 38417314 DOI: 10.1016/j.ecoenv.2024.116137] [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] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/26/2024] [Accepted: 02/19/2024] [Indexed: 03/01/2024]
Abstract
Silver nanoparticles (AgNPs) have wide clinical applications because of their excellent antibacterial properties; however, they can cause liver inflammation in animals. Macrophages are among the main cells mediating inflammation and are also responsible for the phagocytosis of nanomaterials. The NLRP3 inflammasome is a major mechanism of inflammation, and its activation both induces cytokine release and triggers inflammatory cell death (i.e., pyroptosis). In previous studies, we demonstrated that mitophagy activation plays a protective role against AgNP-induced hepatotoxicity. However, the exact molecular mechanisms underlying these processes are not fully understood. In this study, we demonstrate that AgNP exposure induces NLRP3 inflammasome activation, mitochondrial damage and pyroptosis in vivo and in vitro. NLRP3 silencing or inhibiting mitochondrial reactive oxygen species (ROS) overproduction reduces PINK1-Parkin-mediated mitophagy. Meanwhile, the inhibition of mitophagy ROS production, mitochondrial, NLRP3-mediated inflammation, and pyroptosis in RAW264.7 cells were more pronounced than in the control group. These results suggest that PINK1-Parkin-mediated mitophagy plays a protective role by reducing AgNP-induced mitochondrial ROS and subsequent NLRP3 inflammasome activation.
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Affiliation(s)
- Jiangyan Li
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui Province 233030, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, China
| | - Ming Li
- Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Ruirui Wang
- Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Jiaqi Lan
- Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Lian Yu
- Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Jie Gao
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Hezuo Lü
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Qiang Fang
- Bengbu Medical University, Bengbu, Anhui Province 233030, China
| | - Fengchao Wang
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui Province 233030, China.
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Pei W, Zhang Y, Zhu X, Zhao C, Li X, Lü H, Lv K. Multitargeted Immunomodulatory Therapy for Viral Myocarditis by Engineered Extracellular Vesicles. ACS Nano 2024; 18:2782-2799. [PMID: 38232382 DOI: 10.1021/acsnano.3c05847] [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] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
Immune regulation therapies are considered promising for treating classically activated macrophage (M1)-driven viral myocarditis (VM). Alternatively, activated macrophage (M2)-derived extracellular vesicles (M2 EVs) have great immunomodulatory potential owing to their ability to reprogram macrophages, but their therapeutic efficacy is hampered by insufficient targeting capacity in vivo. Therefore, we developed cardiac-targeting peptide (CTP) and platelet membrane (PM)-engineered M2 EVs enriched with viral macrophage inflammatory protein-II (vMIP-II), termed CTP/PM-M2 EVsvMIP-II-Lamp2b, to improve the delivery of EVs "cargo" to the heart tissues. In a mouse model of VM, the intravenously injected CTP/PM-M2 EVsvMIP-II-Lamp2b could be carried into the myocardium via CTP, PM, and vMIP-II. In the inflammatory microenvironment, macrophages differentiated from circulating monocytes and macrophages residing in the heart showed enhanced endocytosis rates for CTP/PM-M2 EVsvMIP-II-Lamp2b. Subsequently, CTP/PM-M2 EVsvMIP-II-Lamp2b successfully released functional M2 EVsvMIP-II-Lamp2b into the cytosol, which facilitated the reprogramming of inflammatory M1 macrophages to reparative M2 macrophages. vMIP-II not only helps to increase the targeting ability of M2 EVs but also collaborates with M2 EVs to regulate M1 macrophages in the inflammatory microenvironment and downregulate the levels of multiple chemokine receptors. Finally, the cardiac immune microenvironment was protectively regulated to achieve cardiac repair. Taken together, our findings suggest that CTP-and-PM-engineered M2 EVsvMIP-II-Lamp2b represent an effective means for treating VM and show promise for clinical applications.
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Affiliation(s)
- Weiya Pei
- Central Laboratory, The first affiliated hospital of Wannan Medical College, Wuhu 241000, P.R. China
- Anhui Province Key Laboratory of Non-coding RNA Basic and Clinical Transformation, Wuhu 241000, P.R. China
- Anhui Province Clinical Research Center for Critical Respiratory Medicine, Wuhu 241000, P.R. China
| | - Yingying Zhang
- Department of Laboratory Medicine, The First Affiliated Hospital of Wannan Medical College, Wuhu 241000, P.R. China
| | - Xiaolong Zhu
- Central Laboratory, The first affiliated hospital of Wannan Medical College, Wuhu 241000, P.R. China
- Anhui Province Key Laboratory of Non-coding RNA Basic and Clinical Transformation, Wuhu 241000, P.R. China
- Anhui Province Clinical Research Center for Critical Respiratory Medicine, Wuhu 241000, P.R. China
| | - Chen Zhao
- Suzhou Hospital, Affiliated Hospital of Medical School, Nanjing University, Suzhou 215163, P.R. China
| | - Xueqin Li
- Central Laboratory, The first affiliated hospital of Wannan Medical College, Wuhu 241000, P.R. China
- Anhui Province Key Laboratory of Non-coding RNA Basic and Clinical Transformation, Wuhu 241000, P.R. China
- Anhui Province Clinical Research Center for Critical Respiratory Medicine, Wuhu 241000, P.R. China
| | - Hezuo Lü
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Bengbu 233030, P.R. China
- Anhui Key Laboratory of Tissue Transplantation, Bengbu Medical University, Bengbu 233030, P.R. China
| | - Kun Lv
- Central Laboratory, The first affiliated hospital of Wannan Medical College, Wuhu 241000, P.R. China
- Anhui Province Key Laboratory of Non-coding RNA Basic and Clinical Transformation, Wuhu 241000, P.R. China
- Anhui Province Clinical Research Center for Critical Respiratory Medicine, Wuhu 241000, P.R. China
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Sun Y, Song X, Geng Z, Xu Y, Xiao L, Chen Y, Li B, Shi J, Wang L, Wang Y, Zhang X, Zuo L, Li J, Lü H, Hu J. IL-11 ameliorates oxidative stress damage in neurons after spinal cord injury by activating the JAK/STAT signaling pathway. Int Immunopharmacol 2024; 127:111367. [PMID: 38160564 DOI: 10.1016/j.intimp.2023.111367] [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: 11/06/2023] [Revised: 12/07/2023] [Accepted: 12/10/2023] [Indexed: 01/03/2024]
Abstract
OBJECTIVE Excess reactive oxygen species (ROS) generated by oxidative stress is a crucial factor affecting neuronal dysfunction after spinal cord injury (SCI). IL-11 has been reported to have antioxidative stress capacity. In the present study, we investigated the protective effect and mechanism of IL-11 against neuronal cell damage caused by oxidative imbalance. METHODS We established a H2O2-induced oxidative stress injury model in PC12 cells and observed the effects of IL-11 on cellular activity, morphology, oxidase and antioxidant enzymes, and ROS release. Furthermore, the effect of IL-11 on apoptosis of PC12 cells was assessed by flow cytometry, a TUNEL assay and Western blotting. Transcriptome analysis and rescue experiments revealed the mechanism by which IL-11 protects neurons from oxidative stress damage. For the in vivo investigation, an adenovirus-mediated IL-11 overexpression SCI rat model was constructed to validate the beneficial effect of IL-11 against SCI. RESULTS IL-11 significantly improved the viability and enhanced the antioxidant activity of H2O2-treated PC12 cells while reducing ROS release. In addition, IL-11 reduced H2O2-induced PC12 cell apoptosis. Transcriptome analysis revealed that the JAK/STAT pathway may be related to the antioxidant activity of IL-11. Treatment with a JAK/STAT inhibitor (Stattic) exacerbated the oxidative damage induced by H2O2 and attenuated the protective effects of IL-11. The results of in vivo studies showed that IL-11 prevented neuronal apoptosis due to oxidative imbalance and promoted the restoration of motor function in SCI rats by activating the JAK/STAT signaling pathway. CONCLUSION IL-11 inhibited oxidative stress-induced neuronal apoptosis at least in part by activating the JAK/STAT signaling pathway and further promoted the recovery of motor function. These findings suggest that IL-11 may be an effective target for the treatment for SCI.
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Affiliation(s)
- Yang Sun
- Department of rehabilitation medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Xue Song
- Department of Central Laboratory, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China
| | - Zhijun Geng
- Department of Central Laboratory, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China
| | - Yibo Xu
- Bengbu Medical University, Bengbu, China
| | - Linyu Xiao
- Department of rehabilitation medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China; Bengbu Medical University, Bengbu, China
| | - Yue Chen
- Department of rehabilitation medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China; Bengbu Medical University, Bengbu, China
| | - Bohan Li
- Bengbu Medical University, Bengbu, China
| | - Jinran Shi
- Bengbu Medical University, Bengbu, China
| | - Lian Wang
- Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China; Department of Gastrointestinal Surgery, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yueyue Wang
- Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China; Department of Clinical Laboratory, First Affiliated Hospital of Bengbu Medical University, Bengbu, China
| | - Xiaofeng Zhang
- Department of Central Laboratory, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China
| | - Lugen Zuo
- Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China; Department of Gastrointestinal Surgery, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Jing Li
- Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China; Department of Clinical Laboratory, First Affiliated Hospital of Bengbu Medical University, Bengbu, China
| | - Hezuo Lü
- Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China; Department of Gastrointestinal Surgery, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China.
| | - Jianguo Hu
- Inflammatory Bowel Disease Research Center, First Affiliated Hospital of Bengbu Medical University, Bengbu, China; Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Bengbu, China; Department of Clinical Laboratory, First Affiliated Hospital of Bengbu Medical University, Bengbu, China.
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Li F, Song X, Xu J, Shi Y, Hu R, Ren Z, Qi Q, Lü H, Cheng X, Hu J. Morroniside protects OLN-93 cells against H 2O 2-induced injury through the PI3K/Akt pathway-mediated antioxidative stress and antiapoptotic activities. Cell Cycle 2021; 20:661-675. [PMID: 33734020 DOI: 10.1080/15384101.2021.1889186] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Neurodegenerative disorders, including spinal cord injury (SCI), result in oxidative stress-induced cell damage. Morroniside (MR), a major active ingredient of the Chinese herb Shan Zhu Yu, has been shown to ameliorate oxidative stress and inflammatory response. Our previous study also confirmed that morroniside protects SK-N-SH cell line (human neuroblastoma cells) against oxidative impairment. However, it remains unclear whether MR also plays a protective role for oligodendrocytes that are damaged following SCI. The present study investigated the protective effects of MR against hydrogen peroxide (H2O2)-induced cell death in OLN-93 cells. MR protected OLN-93 cells from H2O2-induced injury, attenuated H2O2-induced increase in reactive oxygen species (ROS) and malondialdehyde (MDA) levels, and blocked the reduction of mitochondrial membrane potential (MMP) induced by H2O2. MR enhanced the activity of the antioxidant enzyme superoxide dismutase (SOD) and suppressed H2O2-induced downregulation of the antiapoptotic protein Bcl-2 and activation of the proapoptotic protein caspase-3. Finally, we found that LY294002, a specific inhibitor of the PI3K/Akt pathway, inhibited the protective effect of MR against H2O2-induced OLN-93 cell injury in the MTT and TUNEL assays. LY294002 also inhibited the expression of SOD and Bcl-2, and increased the expression of iNOS and c-caspase-3 induced by MR treatment. MR exerts protective effects against H2O2-induced OLN-93 cell injury through the PI3K/Akt signaling pathway-mediated antioxidative stress and antiapoptotic activities. MR may provide a potential strategy for SCI treatment or other related neurodegeneration.
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Affiliation(s)
- Fengzhi Li
- Department of Cell Biology College of Basic Medical Sciences, Dalian Medical University, Dalian, P.R. China
| | - Xue Song
- Department of Central Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, P.R. China.,Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, P.R. China
| | - Jiaxin Xu
- Department of Cell Biology College of Basic Medical Sciences, Dalian Medical University, Dalian, P.R. China
| | - Yujiao Shi
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, P.R. China.,Anhui Key Laboratory of Tissue Transplantation, Bengbu Medical College, Bengbu, P.R. China
| | - Ruina Hu
- Department of Cell Biology College of Basic Medical Sciences, Dalian Medical University, Dalian, P.R. China
| | - Zhen Ren
- Department of Cell Biology College of Basic Medical Sciences, Dalian Medical University, Dalian, P.R. China
| | - Qi Qi
- Anhui Key Laboratory of Tissue Transplantation, Bengbu Medical College, Bengbu, P.R. China
| | - Hezuo Lü
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, P.R. China.,Anhui Key Laboratory of Tissue Transplantation, Bengbu Medical College, Bengbu, P.R. China
| | - Xiaoxin Cheng
- Department of Cell Biology College of Basic Medical Sciences, Dalian Medical University, Dalian, P.R. China
| | - Jianguo Hu
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, P.R. China.,Anhui Key Laboratory of Tissue Transplantation, Bengbu Medical College, Bengbu, P.R. China
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Abstract
We study mechanical cooling in systems of coupled passive (lossy) and active (with gain) optical resonators. We find that for a driving laser which is red-detuned with respect to the cavity frequency, the supermode structure of the system is radically changed, featuring the emergence of genuine high-order exceptional points. This in turn leads to giant enhancement of both the mechanical damping and the spring stiffness, facilitating low-power mechanical cooling in the vicinity of gain-loss balance. This opens up new avenues of steering micromechanical devices with exceptional points beyond the lowest-order two.
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Affiliation(s)
- H Jing
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, China.
| | - Ş K Özdemir
- Electrical and Systems Engineering, Washington University, St. Louis, Missouri, 63130, USA.
| | - H Lü
- Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai, 201800, China
| | - Franco Nori
- CEMS, RIKEN, Saitama, 351-0198, Japan.,Physics Department, University of Michigan, Ann Arbor, MI 48109-1040, USA
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Abstract
PURPOSE Our purpose was to systematically investigate the expression pattern and role of Olig1 in neural cells during rat spinal cord development. ANIMALS AND METHODS Spinal cord tissues were dissected from Sprague-Dawley rats at embryonic day 14.5 (E14.5) and E18.5, postnatal day 0 (P0), P3, P7, postnatal 2 weeks (P2W), P4W, and adults (more than 2 months after birth), respectively. The expression of Olig1 was determined by Western blot and immunostaining. To observe expression of Olig1 in different neural cell types, a double immunohistochemical staining was performed using antibodies against Olig1 with O4, β-tubulin, glial fibrillary acidic protein (GFAP), and myelin basic protein, respectively. RESULTS The expression of Olig1 protein shows a significant level change in rat spinal cord at different developmental time points. Starting with E14.5, the expression gradually increased and peaked at E18.5. Olig1 decreased gradually from P3 and reached its lowest level on P7. However, interestingly, the Olig1 expression increased again from P2W, until adulthood. Olig1 was coexpressed with O4-positive oligodendrocyte progenitor cells (OPCs) and β-tubulin-positive neurons at all time points during development. Olig1 was also coexpressed transiently with GFAP-positive astrocytes at only E14.5. Olig1 was localized in the cytoplasm of O4- and β-tubulin-positive cells during the period from E14.5 to adult. CONCLUSION The expression of Olig1 in OPCs and neurons at all time points during development and in astrocytes at E14.5 suggests that Olig1 may play an important role in the generation and maturation of specific neural cells during development of spinal cord. Our results contribute to understanding the mechanism underlying developmental regulation of neural cells by Olig1.
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Affiliation(s)
- Qi Qi
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China; Department of Histology and Embryology, Bengbu Medical College, Bengbu, Anhui, People's Republic of China
| | - Yuxin Zhang
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China
| | - Lin Shen
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China
| | - Rui Wang
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China
| | - Jiansheng Zhou
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China
| | - Hezuo Lü
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China; Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China
| | - Jianguo Hu
- Anhui Key Laboratory of Tissue Transplantation, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China; Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, People's Republic of China
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Abstract
Extensions of Einstein gravity with higher-order derivative terms arise in string theory and other effective theories, as well as being of interest in their own right. In this Letter we study static black-hole solutions in the example of Einstein gravity with additional quadratic curvature terms. A Lichnerowicz-type theorem simplifies the analysis by establishing that they must have vanishing Ricci scalar curvature. By numerical methods we then demonstrate the existence of further black-hole solutions over and above the Schwarzschild solution. We discuss some of their thermodynamic properties, and show that they obey the first law of thermodynamics.
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Affiliation(s)
- H Lü
- Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, China
| | - A Perkins
- The Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom
| | - C N Pope
- George P. & Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA
- DAMTP, Centre for Mathematical Sciences, Cambridge University, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
| | - K S Stelle
- The Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom
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Wang D, Lü H, Xu T. Mediation by calcium/calmodulin-dependent protein kinase II of suppression of GABA(A) receptors by NMDA. ACTA ACUST UNITED AC 2011; 43:655-62. [PMID: 18726361 DOI: 10.1007/bf02882287] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2000] [Indexed: 10/22/2022]
Abstract
Using nystatin-perforated whole-cell recording configuration, the modulatory effect of N-methyl-D-aspartate (NMDA) on gamma-aminobutyric acid (GABA)-activated whole-cell currents was investigated in neurons freshly dissociated from the rat sacral dorsal commissural nucleus (SDCN). The results showed that: (i) NMDA suppressed GABA-and muscimol (Mus)-activated currents (I(gaba) and I(Mus)), respectively in the Mg(2+)-free external solution containing 1 mumol/L glycine at a holding potential (V ( H )) of -40 mV in SDCN neurons. The selective NMDA receptor antagonist, D-2-amino-5-phosphonovaleric acid (APV, 100 gammamol/L), inhibited the NMDA-evoked currents and blocked the NMDA-induced suppression of I(gaba); (ii) when the neurons were incubated in a Ca(2+)-free bath or pre-loaded with a membrane-permeable Ca(2+) chelator, BAPTA AM (10 mumol/L), the inhibitory effect of NMDA on I(GAba) disappeared. Cd(2+) (10 mumol/L) or La(3+) (30 mumol/L), the non-selective blockers of voltage-dependent calcium channels, did not affect the suppression of I(gaba) by NMDA application; (iii) the suppression of I(GAba) by NMDA was inhibited by KN-62, a calcium/calmodulin-dependent protein kinase II (CaMKII) inhibitor. These results indicated that the inhibition of GABA response by NMDA is Ca(2+)-dependent and CaMKII is involved in the process of the Ca(2+)-dependent inhibition.
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Affiliation(s)
- D Wang
- Department of Basic Medicine, The Fourth Military Medical University, 710032, Xi'an, China
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Abstract
We study four-dimensional gravity theories that are rendered renormalizable by the inclusion of curvature-squared terms to the usual Einstein action with a cosmological constant. By choosing the parameters appropriately, the massive scalar mode can be eliminated and the massive spin-2 mode can become massless. This "critical" theory may be viewed as a four-dimensional analogue of chiral topologically massive gravity, or of critical "new massive gravity" with a cosmological constant, in three dimensions. We find that the on-shell energy for the remaining massless gravitons vanishes. There are also logarithmic spin-2 modes, which have positive energy. The mass and entropy of standard Schwarzschild-type black holes vanish. The critical theory might provide a consistent toy model for quantum gravity in four dimensions.
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Affiliation(s)
- H Lü
- China Economics and Management Academy, Central University of Finance and Economics, Beijing, China
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Hu J, Zhou J, Li X, Wang F, Lü H. Schwann cells promote neurite outgrowth of dorsal root ganglion neurons through secretion of nerve growth factor. Indian J Exp Biol 2011; 49:177-182. [PMID: 21452596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The transplantation of Schwann cells (SCs) could successfully promote axonal regeneration. This is likely to attribute to the adhesion molecules expression and growth factors secretion of SCs. But which factor(s) play a key role has not been precisely studied. In this study, an outgrowth assay using dorsal root ganglia (DRG) neuron-SC co-culture system in vitro was performed. Co-culture of SCs or application of SC-conditioned medium (CM) substantially and significantly increased DRG neurite outgrowth. Further, nerve growth factor and NGF receptor (TrkA) mRNA were highly expressed in Schwann cells and DRG neuron, respectively. The high concentration of NGF protein was detected in SC-CM. When K-252a, a specific inhibitor of NGF receptor was added, DRG neurite outgrowth was significantly decreased in a concentration-dependent manner. These data strongly suggest that SCs play important roles in neurite outgrowth of DRG neurons by secreted NGF.
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Affiliation(s)
- Jianguo Hu
- Department of Clinical Laboratory Science, The First Affiliated Hospital of Bengbu Medical College, 287 Changhuai Road Bengbu 233004, PR China.
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Chen Z, Ma Z, Wang Y, Li Y, Lü H, Fu S, Hang Q, Lu PH. Oligodendrocyte-spinal cord explant co-culture: an in vitro model for the study of myelination. Brain Res 2009; 1309:9-18. [PMID: 19879858 DOI: 10.1016/j.brainres.2009.10.060] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 10/23/2009] [Accepted: 10/24/2009] [Indexed: 12/29/2022]
Abstract
The in vitro models developed to investigate the growth and myelination of axons, such as dorsal root ganglion (DRG)-Schwann cell co-culture, DRG-oligodendrocyte co-culture and central nervous system (CNS) neuron-oligodendrocyte co-culture, have provided an effective way to reveal the mechanisms that underlie the interaction between neurons and myelin-forming cells. In order to better understand the complex process of myelination during CNS development and spinal cord repair, we established a rat spinal cord neuron-oligodendrocyte co-culture model. In this co-culture system, the spinal cord explants were used as the source of neurons, and the oligodendrocytes were induced from GFP-oligodendrocyte precursor cells (GFP-OPCs). The results showed that the GFP-oligodendrocytes that differentiated from GFP-OPCs in co-culture attached to the neurites growing out from the spinal cord explants and formed myelin structures. As the oligodendrocytes expressed GFP, and the neuron somas remained in the explants, the interaction between oligodendrocytes and neurites in co-culture were observed clearly and dynamically without immunostaining.
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Affiliation(s)
- Zhifang Chen
- Department of Neurobiology, Shanghai Jiaotong University School of Medicine, 280 South Chongqing Road, Shanghai, P.R. China
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Lü H, Chen J, Li WL, Ren BR, Wu JL, Zhang HQ. Hypoglycemic effect of the total flavonoid fraction from folium Eriobotryae. Phytomedicine 2009; 16:967-971. [PMID: 19427773 DOI: 10.1016/j.phymed.2009.03.024] [Citation(s) in RCA: 23] [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: 01/16/2009] [Revised: 02/24/2009] [Accepted: 03/23/2009] [Indexed: 05/27/2023]
Abstract
The antidiabetic effect of the total flavonoids fraction from leaves of Eriobotrya japonica (EJF) was evaluated through normal and streptozotocin-induced diabetic mice with graded oral doses of 150, 300, 450 mg/kg for 7 days or 14 days. The result showed that the dose of 300 mg/kg and 450 mg/kg resulted significant hypoglycemic effect on normal mice, the dose of 300 mg/kg induced significant decrease in plasma glucose concentration (PGC), glycosylated serum protein (GSP), total cholesterol (TC) and triglyceride (TG), and significant increase in superoxide dismutase (SOD) activity and serum insulin level in streptozotocin-diabetic mice. These results suggested that EJF has hypoglycemic potential.
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Affiliation(s)
- H Lü
- Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences, Nanjing 210014, Jiangsu, PR China
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24
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Abstract
Recently Horava proposed a nonrelativistic renormalizable theory of gravitation, which reduces to Einstein's general relativity at large distances, and that may provide a candidate for a UV completion of Einstein's theory. In this Letter, we derive the full set of equations of motion, and then we obtain spherically symmetric solutions and discuss their properties. We also obtain solutions for the Friedmann-Lemaître-Robertson-Walker cosmological metric.
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Affiliation(s)
- H Lü
- George and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A &M University, College Station, Texas 77843-4242, USA
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25
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Lü H, Chen J, Li WL, Ren BR, Wu JL, Kang HY, Zhang HQ, Adams A, De Kimpe N. Hypoglycemic and hypolipidemic effects of the total triterpene acid fraction from Folium Eriobotryae. J Ethnopharmacol 2009; 122:486-91. [PMID: 19429317 DOI: 10.1016/j.jep.2009.01.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 10/08/2008] [Accepted: 01/20/2009] [Indexed: 05/12/2023]
Abstract
For seeking the good natural material to develop new agent to treat diabetes, the total triterpene acid (TTA) fraction extracted from Folium Eriobotryae [leaves of Eriobotrya japonica (Thunb.) Lindl.] was evaluated for its hypoglycemic and hypolipidemic potential through normal, alloxan and streptozotocin-induced diabetic mice administered with graded oral doses (100, 200, 300 mg/(kg day)) for 7 or 14 days. The results showed that a dose of 300 mg/kg of TTA is the most effective dose to cause significant (p<0.01) hypoglycemic and/or hypolipidemic effects on normal, alloxan and streptozotocin-induced diabetic mice. This dose also significantly (p<0.01) lowered the glycosylated serum protein (GSP), total cholesterol (TC) and triglyceride (TG) level in severely diabetic mice. Furthermore, TTA increased the superoxide dismutase activity (SOD) and the serum insulin level of diabetic mice. These evidences indicated that the total triperpene acid fraction from Folium Eriobotryae has a high anti-diabetic potential along with a good hypolipidemic profile.
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Affiliation(s)
- H Lü
- Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences, Nanjing, Jiangsu, China
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Wang XQ, Xu D, Ren Q, Zhang GH, Sun XB, Hou XQ, Guo WF, Lü H. Preparation, single crystal growth and characterization of bis(tetrabutylammonium)bis(4,5-dithiolato-1,3-dithiole-2-thione)copper. Cryst Res Technol 2007. [DOI: 10.1002/crat.200610827] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Chong ZW, Cvetic M, Lü H, Pope CN. General nonextremal rotating black holes in minimal five-dimensional gauged supergravity. Phys Rev Lett 2005; 95:161301. [PMID: 16241780 DOI: 10.1103/physrevlett.95.161301] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2005] [Indexed: 05/05/2023]
Abstract
We construct the general solution for nonextremal charged rotating black holes in five-dimensional minimal gauged supergravity. They are characterized by four nontrivial parameters: namely, the mass, the charge, and the two independent rotation parameters. The metrics in general describe regular rotating black holes, providing the parameters lie in appropriate ranges so that naked singularities and closed timelike curves (CTCs) are avoided. We calculate the conserved energy, angular momenta, and charge for the solutions, and show how supersymmetric solutions arise in a Bogomol'nyi-Prasad-Sommerfield limit. These have naked CTCs in general, but for special choices of the parameters we obtain new regular supersymmetric black holes or smooth topological solitons.
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Affiliation(s)
- Z-W Chong
- George P. and Cynthia W. Mitchell Institute for Fundamental Physics, Texas A&M University, College Station, 77843, USA
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29
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Abstract
We obtain infinite classes of new Einstein-Sasaki metrics on complete and nonsingular manifolds. They arise, after Euclideanization, from BPS limits of the rotating Kerr-de Sitter black hole metrics. The new Einstein-Sasaki spaces L(p,q,r) in five dimensions have cohomogeneity 2 and U(1) x U(1) x U(1) isometry group. They are topologically S(2) x S(3). Their AdS/CFT duals describe quiver theories on the four-dimensional boundary of AdS(5). We also obtain new Einstein-Sasaki spaces of cohomogeneity n in all odd dimensions D = 2n + 1 > or = 5, with U(1)(n + 1) isometry.
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Affiliation(s)
- M Cvetic
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, 19104, USA
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Abstract
We obtain an exact solution of the supergravity equations of motion in which the four-dimensional observed Universe is one of a number of colliding D3 branes in a Calabi-Yau background. The collision results in the ten-dimensional spacetime splitting into disconnected regions, bounded by curvature singularities. However, near the D3 branes the metric remains static during and after the collision. We also obtain a general class of solutions representing p-brane collisions in arbitrary dimensions, including one in which the universe ends with the mutual annihilation of a positive-tension and a negative-tension 3 brane.
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Affiliation(s)
- G W Gibbons
- DAMTP, Centre for Mathematical Sciences, Cambridge University Wilberforce Road, Cambridge CB3 OWA, United Kingdom
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Gibbons GW, Lü H, Page DN, Pope CN. Rotating black holes in higher dimensions with a cosmological constant. Phys Rev Lett 2004; 93:171102. [PMID: 15525064 DOI: 10.1103/physrevlett.93.171102] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2004] [Indexed: 05/24/2023]
Abstract
We present the metric for a rotating black hole with a cosmological constant and with arbitrary angular momenta in all higher dimensions. The metric is given in both Kerr-Schild and the Boyer-Lindquist form. In the Euclidean-signature case, we also obtain smooth compact Einstein spaces on associated S(D-2) bundles over S2, infinitely many for each odd D>/=5. Applications to string theory and M-theory are indicated.
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Affiliation(s)
- G W Gibbons
- DAMTP, Centre for Mathematical Sciences, Cambridge University,Wilberforce Road, Cambridge CB3 OWA, United Kingdom
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33
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Cvetic M, Gibbons GW, Lü H, Pope CN. M-theory conifolds. Phys Rev Lett 2002; 88:121602. [PMID: 11909445 DOI: 10.1103/physrevlett.88.121602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2001] [Indexed: 05/23/2023]
Abstract
Seven manifolds of G2 holonomy provide a bridge between M-theory and string theory, via Kaluza-Klein reduction to Calabi-Yau six manifolds. We find first-order equations for a new family of G2 metrics D7, with S3 x S3 principal orbits. These are related at weak string coupling to the resolved conifold, paralleling earlier examples B7 that are related to the deformed conifold, allowing a deeper study of topology change and mirror symmetry in M-theory. The D7 metrics' nontrivial parameter characterizes the squashing of an S3 bolt, which limits to S2 at weak coupling. In general the D7 metrics are asymptotically locally conical, with a nowhere-singular circle action.
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Affiliation(s)
- M Cvetic
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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Gu B, Wu D, Lü H, Li M, Gao H, Wan Y. Potentiation of docetaxel antitumor activity by batimastat against mouse forestomach carcinoma. Chin Med Sci J 2001; 16:223-6. [PMID: 12903761] [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: 03/04/2023]
Abstract
OBJECTIVE To improve the treatment of tumors, we studied the combined effects of docetaxel and batimastat (BB-94) on mouse forestomach carcinoma (MFC), and compared them with doxorubicin. METHODS AND RESULTS In vitro, growth curve analysis, MTT assay and clonogenic assay used to determine the cytotoxic effect of docetaxel or/and BB-94 on MFC cell showed that docetaxel but not BB-94 had a significant cytotoxicity, and the effect of docetaxel wasn't enhanced by BB-94. In early stage MFC tumor model, obvious antitumor effect of docetaxel or doxorubicin given i.v. at maximum tolerated dose (MTD, docetaxel: 20 mg/kg; doxorubicin: 6 mg/kg) every 4 days for 3 injections (q4d x 3), even that of BB-94 (30 mg/kg i. p. qd x 20) was observed. Tumor growth inhibition was greater for docetaxel-batimastat (96.0%) than for doxorubicin-batimastat (88.0%), docetaxel (89.0%), doxorubicin (68.0%) and BB-94 (33.0%), and the effect of docetaxel could be potentiated by BB-94. Docetaxel also showed activity against advanced stage MFC tumor in dose-dependent manner, and was more effective at MTD than doxorubicin with 4/5 regressions, 46.5 days tumor growth delay and 2.8log(10) tumor cell kill. CONCLUSION Our results suggest that in the MFC model with dose and schedule used, docetaxel is an effective cytotoxic new drug against MFC tumor and BB-94 enchances the antitumor activity of docetaxel.
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Affiliation(s)
- B Gu
- Department of Clinical Pharmacology, North Taiping Road Hospital, Beijing 100039
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36
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Hong X, Lü H, Yang J, Li Z. [An analysis on the forearm bone mass density of rural female and the environmental risk factors]. Wei Sheng Yan Jiu 2001; 30:227-30. [PMID: 12561522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The distribution of distal and proximal forearm bone mass densities (BMD) with age was discribed and the environmental risk factors of rural female analyzed. A group of 1432 rural female aged 15 and over were sellected. Their demographic characteristics, living and eating habit were obtained by standardized questionnaire. The distal and proximal forearm bone mass density were measured by peripheral dual-energy X ray absorptionmetry (pDEXA). The results showed that the distal and proximal forearm BMDs were increased with age before age 25 and 30 respectively, and reached the peak value at age 30-35. The distal forearm bone density decreased significantly at age 40 while the proximal forearm BMD decreased at age 45. Bone loss rate of the two bone sites was increased significantly at age 50 and reached the peak value at age 55-60. Only the the density of proximal forearm bone, and the year of menopause was the main cause of low bone density. Body weight was the positive factor for bone density at age less than 60. Height only positively affected the proximal forearm bone of those at age 30-45. More ever, drinking tea, parity and educational status may affect distal forearm bone in certain age group while parity, educational status, occupation and marital status were possible risk factors of proximal forearm BMD. It is concluded that environmental risk factors of BMD varied with bone site and age. The prevention of low BMD must rely on subject's age and bone site. The surveillance of low bone density must put the emphasis on spony bone.
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Affiliation(s)
- X Hong
- Biomedical Institute of Anhui Medical University, Hefei 230032, China
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Gu B, Wu D, Li M, Lü H. Potentiation of docetaxel antitumor activity by batimastat against mouse forestomach carcinoma. J Environ Pathol Toxicol Oncol 2001; 19:375-82. [PMID: 11213020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
Docetaxel is a chemical compound belonging to the taxoid class of anticancer agents. Batimastat (BB-94) is the first matrix metalloproteinase inhibitor entering clinical trials. To improve the treatment of tumors, we studied the combined effects of docetaxel and batimastat on mouse forestomach carcinoma (MFC), and compared them with doxorubicin. In vitro growth curve analysis, MTT assay, and clonogenic assay were used to determine the cytotoxic effect of docetaxel or/and BB-94 on MFC. They showed that docetaxel, but not BB-94, had a significant cytotoxicity and that the effect of docetaxel was not enhanced by BB-94. In an early stage MFC tumor model, an obvious antitumor effect of docetaxel or doxorubicin given iv at maximum tolerated dose (MTD) was observed. Tumor growth inhibition was greater for docetaxel + BB-94 (96.0%) than for doxorubicin + BB-94 (88.0%), docetaxel (89.0%), doxorubicin (68.0%), and BB-94 (33.0%). Docetaxel showed activity against advanced stage MFC tumor in a dose-dependent manner and was more effective at MTD than doxorubicin, with 4/5 regression, 46.5 days tumor growth delay, and 2.8 log10 tumor-cell kill. Our results suggest that docetaxel is an effective new cytotoxic drug against MFC tumor and that BB-94 enhances the antitumor activity of docetaxel in the dose and schedule used.
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Affiliation(s)
- B Gu
- Department of Clinical Pharmacology, North Taiping Road Hospital, Beijing, China
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Liu H, Lü H, Wei W. [Posterior atlantoaxial facet screw fixation in rheumatoid arthritis]. Zhonghua Wai Ke Za Zhi 2000; 38:831-3. [PMID: 11832175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To clarify the characteristics of the clinicopathological factors in cases of atlantoaxial instability due to rheumatoid and to introduce a new method for the treatment of this disease. METHODS Fifteen patients with atlantoaxial instability due to rheumatoid were treated with posterior facet screws to obtain immediate rigid fixation of C(1 - 2). In this series of patients, screw fixation was augmented with an interspinous C(1 - 2) strut graft which was wired in place to provide three-point stabilization and to facilitate bone fusion. RESULTS In each patient fixation was satisfactory, and C(1 - 2) alignment and stability were restored without complication due to instrumentation. All patients showed osseous union (a mean follow-up period of 10 months; range 6 - 14 months). CONCLUSION Posterior atlantoaxial facet screw fixation provides immediate three-dimension rigid fixation of C(1 - 2) that is biomechanically superior to wiring or other fixation.
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Affiliation(s)
- H Liu
- Arthritis Clinic and Research Center, People's Hospital, Beijing University, Beijing 100044, China
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Lü H, Wu D, Wan Y, Gu B, Wang J. Cytotoxic effects of 5-fluorocytosine on melanoma cells transduced with cytosine deaminase gene. J Environ Pathol Toxicol Oncol 2000; 19:9-12. [PMID: 10905502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
To investigate the cytotoxic effects of 5-fluorocytosine on melanoma cells genetically modified with cytosine deaminase gene, the gene was transduced into the tumor cells with the retroviral method. The cytotoxicity effects of 5-fluorocytosine on the tumor cells were measured with the MTT assay and clonogenic assay. It was found that the prodrug 5-fluorocytosine had significant cytotoxic effects on melanoma cells transduced with cytosine deaminase in vitro. The IC50 value of 5-fluorocytosine on transgenic and nontransgenic melanoma cells was 572 microg/mL(-1) and 3870 microg/mL(-1), respectively. Our experiment demonstrated the potential value of the cytosine deaminase gene/5-fluorocytosine system in the treatment of melanoma.
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Affiliation(s)
- H Lü
- Department of Clinical Pharmacology, Affiliated North Taiping Hospital, Beijing, China
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Lü H, Li G, Zhou Y, Jin J, Jiang K, Peng X, Yuan J, Qiang B. [The identification and cloning of human ubiquitin binding enzyme cDNA]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2000; 22:306-11. [PMID: 12903439] [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: 03/04/2023]
Abstract
OBJECTIVE To identify and clone the gene encoding human ubiquitin binding enzyme and study its expression spectrum. METHODS According to the sequence of human EST, which is highly homologous to the mouse ubiquitin conjugating enzyme (E2), primers used for library screening were synthesized to screen the human fetal brain cDNA library. The gene was analyzed by making use of bioinformatics and its expression spectrum was studied by using multiple-tissue Northern blot. RESULTS Two cDNA clones encoding human ubiquitin conjugating enzyme were isolated and identified. Both containing the ubiquitin conjugating domain, they were 88% identical in amino acid sequences and found to be isoforms of each other with only an exon excised from the short sequence. They belonged to a highly conserved, and widely expressed E2 enzyme family. Northern blot showed that they were expressed exclusively in heart, placenta, and pancreas while no transcripts could be detected in brain, lung, liver, skeletal muscle, or kidney. CONCLUSIONS The gene encoding human ubiquitin binding enzyme is expressed under both temporal and spatial control. As a key enzyme in the degradation of proteins, ubiquitin conjugating enzymes play a central role in the expression regulation on the level of post-translation.
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Affiliation(s)
- H Lü
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, CAMS, PUMC, Beijing 100005, China
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Kou B, Lü H, Yuan Y, Yan T, Zhou D. [Clinical analysis of 13 infected total knee replacements]. Zhonghua Wai Ke Za Zhi 2000; 38:253-5. [PMID: 11832039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the cause, treatment and its result of infected total knee replacements (TKRs). METHODS Between 1987 and 1999, 13 infected TKRs in 13 patients were treated with surgical debridement and one-stage or two-stage reimplantation. The preoperative average ROM of knees was 55 degrees and the average Hospital for Special Surgery (HSS) knee score was 36.5 points. Clinical results were evaluated after average follow-up for 3 years and 5 months. We analyzed the factors for TKR infection. RESULTS No recurrent infection was noted, and pain was significantly alleviated in all patients. The average ROM of knees was 85 degrees and the average HSS knee score was 73.5 points. CONCLUSIONS The high risk factors for TKR infection are rheumatoid arthritis, steroid administration, associated diabetes mellitus, hinged prosthesis and previous knee surgery. Early surgical debridement with intravenous antibiotics is necessary as soon as deep infection is detected. Two-stage reimplantation is more effective in eradicating deep infection than single debridement or one-stage reimplantation.
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Affiliation(s)
- B Kou
- Arthritis and Clinic Research Center, People's Hospital, Beijing Medical University, Beijing 100044, China
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42
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Gao T, Lü H, Zhou D, Guan Z. [Risk factors for nosocomial infections after total knee replacement]. Zhonghua Wai Ke Za Zhi 2000; 38:256-8. [PMID: 11832040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate prevalence and risk factors of nosocomial infections in patients with total knee replacement. METHODS From August 1993 to October 1998, total knee replacement was performed on 363 patients (503 knees). The difference of nosocomial infection rates was statistically analyzed in comparison with different age, primary disease, and associated disease groups. RESULTS No statistically significant difference was observed in nosocomial infection when compared rheumatoid arthritis with osteoarthritis, bilateral total knee replacement (TKR) with unilateral TKR and different ages. However, the higher nosocomial infection rate was related to the following factors: revision surgery, steroid administration and diabetes urinary infection. 28 female patients demonstrated higher urinary infection rate than that in other systems. CONCLUSIONS Nosocomial infection rate of TKR in rheumatoid cases is related to steroid administration, accompanying diabetes mellitus, previous knee surgery, aged women and retention of urinary catheter. It is feasible to prevent nosocomial infection by controlling the above-mentioned risk factors.
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Affiliation(s)
- T Gao
- Arthritis and Clinic Research Center, People's Hospital, Beijing Medical Univercity, Beijing 100044, China
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Ma X, Hu R, Lü H, Wei K, Zhang L, Xue S, Hou Y. Engineering human interferon alpha1c/86D with phage display technology. Sci China C Life Sci 1999; 42:191-201. [PMID: 18726473 DOI: 10.1007/bf02880056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/1998] [Indexed: 05/26/2023]
Abstract
Human interferon-alpha1c/86D (IFNalpha1c/86D) was functionally displayed on the surface of the filamentous bacteriophage using a phagemid vector system (pCANTAB5E). The key amino acid residues involved in the receptor binding were further defined with phage displayed 6-mer peptide library and two neutralizing antibodies against linear epitopes on the IFN-alpha1b, indicating that residues 30, 33, 34, (AB-loop) and residues 124, 126, 127 (D helix, DE-loop) were more critical than the adjacent residues for recognition of receptor. In addition, a cassette mutagenesis library was generated by fully randomizing the sequence of the four positions 29, 31, 32 and 35 in AB-loop, and used to select phage-IFN variants with WISH-based panning method. Three phage-IFN variants were isolated to possess more antiviral activity in the range of 4-16-fold than parental phage-IFN after IPTG-induced soluble expression. The results suggest that phage displayed phage-IFN alpha1c/86D variants with increased specific activity might be obtained after purification procedures.
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Affiliation(s)
- X Ma
- State Key Laboratory for Molecular Virology and Genetic Engineering, Beijing, China
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Lü H, Luo B, Pan W, Chen J. Tunable output power varying with the splitting ratio of a coupler from a fiber ring semiconductor laser. Appl Opt 1999; 38:1764-1766. [PMID: 18305802 DOI: 10.1364/ao.38.001764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The tunable output power characteristics of a fiber ring semiconductor laser have been studied by use of rate equations. An expression for the tunable output power is deduced. The analysis confirms that there is an optimum coupler splitting ratio to trade off between wavelength tuning width and output power.
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Affiliation(s)
- H Lü
- Department of Computers and Communications Engineering, Southwest Jiaotong University, Chengdu 610031, China
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46
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Abstract
NodD, the major regulatory protein of nodulation, was partially purified from Rhizobium leguminosarum 8401(pIJ1518), and its binding sequences within nodF promoter of R. l. bv. viciae were determined by DNase I footprinting. A series of techniques based on gel retardation were used to analyze the NodD-target DNA interaction, showing that NodD binds to target DNA in isologous octamer.
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Affiliation(s)
- S Liu
- Shanghai Institute of Biochemistry, Chinese Academy of Sciences, China
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Gu J, Lü H, Chen Y, Liu L, Wang P, Ma J, Lu Z. Enhancement of the sensitivity of surface plasmon resonance biosensor with colloidal gold labeling technique. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0968-5677(98)00105-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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48
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Pan F, Lü H, Fan H. [Detection of type 6 human herpesvirus (HHV-6) specific DNA sequence in lymphoma tissues by PCR]. Zhonghua Zhong Liu Za Zhi 1998; 20:196-8. [PMID: 10921006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
OBJECTIVE To study the relationship between human herpesvirus-6 (HHV-6) and lymphoma in China. METHODS The specimens of paraffin-embedded lymphoma tissue, leukemia cell lines and normal blood donor peripheral blood lymphocytes(PBL) were examined for the presence of HHV-6 DNA sequence by polymerase chain reaction (PCR). RESULTS Of the 52 cases lymphoma studied, HHV-6 DNA sequence was detected in 21 cases; of 43 normal PBL, HHV-6 DNA sequence was detected in 8 cases. The difference was statistically significant (P < 0.05). HHV-6 DNA sequence was also present in two leukemia cell lines. CONCLUSION The results suggest that HHV-6 may be related to lymphoma in China.
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Affiliation(s)
- F Pan
- Institute of Basic Medical Sciences, Academy of Medical Sciences, Peking Union Medical College, Beijing
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Navolotski A, Rumjnzev A, Lü H, Proft D, Bartholmes P, Zänker KS. Migration and gap junctional intercellular communication determine the metastatic phenotype of human tumor cell lines. Cancer Lett 1997; 118:181-7. [PMID: 9459208 DOI: 10.1016/s0304-3835(97)00329-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Gap junctional intercellular communication (GJIC) as well as cell migration play an essential role in the metastatic cascade of human tumors. We show a dependence of metastatogenic phenotypes of human tumor cells (cell lines T 24, SCC-25, MDA-MB-361 and SK-BR-3) from the GJIC and the migration activity. The GJIC was studied by microinjection of the fluorescent dye Lucifer Yellow (LY) and cell migration was studied by investigating the locomotion of the tumor cells in 3-dimensional collagen matrices. Diminished GJIC seems to be more influential for the metastatic phenotype than modulation of the locomotory behavior of the tumor cells.
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Affiliation(s)
- A Navolotski
- Research Institute of Pediatric Hematology of Russia, Moscow.
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Niggemann B, Maaser K, Lü H, Kroczek R, Zänker KS, Friedl P. Locomotory phenotypes of human tumor cell lines and T lymphocytes in a three-dimensional collagen lattice. Cancer Lett 1997; 118:173-80. [PMID: 9459207 DOI: 10.1016/s0304-3835(97)00328-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Active cellular locomotion is a feature of such diverse cell types as lymphocytes and cancer cells. The locomotory phenotype of a cell should ultimately reflect the biochemical basis of different migratory strategies. We investigated the locomotory behavior of five epithelial cell lines and one non-epithelial human cell-line as well as human CD4+ T lymphocytes in a three-dimensional collagen type I matrix using time-lapse video microscopy and computer assisted cell-tracking. Migration velocity was up to 70 times lower in tumor cells (0.1-0.3 microm/min) as compared to T lymphocytes (7-7.5 microm/min), whereas the percentage of spontaneously active cells was up to twice as high in tumor cells (80-90%) in comparison to T lymphocytes (54%). Persistence, i.e. the degree of roaming, varied appreciably between the different cell types. In conclusion, velocity and persistence may describe distinct migration strategies in different cell types, i.e. discerning T cell migration from tumor cell invasion.
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Affiliation(s)
- B Niggemann
- Institute of Immunology, University Witten/Herdecke, Witten, Germany
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