501
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Zhang W, Wu H, Yao B, Hu G, Zhou Y. [Experimental study on acellular bovine pericardium guided bone regeneration material]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2006; 20:287-91. [PMID: 16579244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
OBJECTIVE To choose the best procedure on preparation of acellular bovine pericardium (ABP) guided bone regeneration (GBR) material. METHODS The BP was decellularized with 0. 25% Trypsin + 0.5% Triton X-100. The acellular bovine pericardiums (ABPs) were treated with phosphate-buffered saline(PBS) (group A), 95% glycerol (group B), EDAC (group C), and EDAC and 95% glycerol (group D) respectively. The treated ABPs were implanted subcutaneously in the back of SD rats respectively at random and no material was implanted as control. Seven rats were sacrificed at 2 weeks, twelve at 4 weeks, twelve at 8 weeks, seven at 16 weeks. Local reaction was studied grossly. The amount of antigen presenting cell (APC) and the percentage of ABP degeneration were reckoned by images analysis system. RESULTS The ABPs were replaced by fibroblasts completely in group A at 8 weeks, in group C at 16 weeks, but only less than 50% till 16 weeks in groups B and D. In all groups, the depth of surrounding fibres attenuated time-dependently. The APC amount of the groups B and D was higher than that of the control group, and the ABP of the groups B and D degraded partly at 16 weeks. CONCLUSION The ABP treated with EDAC can be replaced by the surrounding tissues and has good biocompatibility.
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502
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Zhang W, Noda R, Horio M. Evaluation of lubrication force on colliding particles for DEM simulation of fluidized beds. POWDER TECHNOL 2005. [DOI: 10.1016/j.powtec.2005.04.021] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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503
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Zhu WH, Zhang WB, Huang XM. [Congenital aortic arch twist abnormality with thoracic aorta aneurysm: a case report]. ZHONGHUA ER KE ZA ZHI = CHINESE JOURNAL OF PEDIATRICS 2005; 43:540. [PMID: 16083564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
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504
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Xie LX, Zhang WB, Huang YS. [The surgical treatment for posterior capsule opacification in children with pseudophakic eyes]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 2005; 41:511-4. [PMID: 16008910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
OBJECTIVE To evaluate the surgical technique and outcome of pars plana capsulotomy and vitrectomy with infusion through the limbus to remove the posterior capsule opacification (PCO) in children with pseudophakic eyes. METHODS This technique was performed in 51 cases (57 eyes) of complicated PCO with pseudophakic eyes, which was almost impossible to remove through the Nd:YAG capsulotomy. Pre- and post-operative visual acuity, intraocular pressure, density of cornea endothelium and complications during and after the operation were observed. The mean follow up time was 30 months. RESULTS The central opaque posterior capsule and anterior vitreous were successfully removed in all patients without complication. A round hole with 3-4 mm diameter was obtained at the central part of the posterior capsule. In all 57 eyes, a clear visual axis was obtained. The visual acuity in all patients was improved and achieved the best level in their history. Visual acuity equal to or better than 0.3 was obtained in 51.9% of all eyes at 3 months. There were no complications during the postoperative follow-up period, such as dislocation or damage of the IOL, corneal edema, vitreous prolapse, retina detachment and reocclusion of the visual axis. CONCLUSION Pars plana capsulotomy and vitrectomy with infusion through the limbus is a safe and effective procedure to remove the PCO in pseudophakic eye, especially for the cases with dense and thick opaque capsule formed after IOL implantation in the children, which cannot be removed through the Nd:YAG capsulotomy.
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505
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Zhang WB, Wang ZX, Murray JL, Fujii N, Broach J, Peiper SC. Functional expression of CXCR4 in S. cerevisiae: development of tools for mechanistic and pharmacologic studies. ERNST SCHERING RESEARCH FOUNDATION WORKSHOP 2004:125-52. [PMID: 14699798 DOI: 10.1007/978-3-662-05403-1_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
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506
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Zhang L, Chen Z, Ren K, Leurs R, Chen J, Zhang W, Ye B, Wei E, Timmerman H. Effects of clobenpropit on pentylenetetrazole-kindled seizures in rats. Eur J Pharmacol 2003; 482:169-75. [PMID: 14660019 DOI: 10.1016/j.ejphar.2003.09.066] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to investigate whether or not clobenpropit, a selective and potent histamine H(3) receptor antagonist, can protect from pentylenetetrazole (35 mg/kg)-kindled seizures in rats. I.c.v. injection with clobenpropit (10 and 20 microg) significantly delayed the seizure stage and prolonged the latency to the onset of myoclonic jerks and the latency to the clonic generalized seizure in a dose-dependent manner. The protection by clobenpropit (20 microg) was completely antagonized by both immepip (5 and 10 microg, i.c.v.), a selective potent histamine H(3) receptor agonist, and alpha-fluoromethylhistidine (alpha-FMH, 50 microg, i.c.v.), a selective histidine decarboxylase inhibitor. In addition, clobenpropit markedly potentiated the histidine (100 and 200 mg/kg)-induced inhibition of pentylenetetrazole-kindled seizures. Pyrilamine (2 and 5 microg, i.c.v.) reversed the inhibition of pentylenetetrazole-kindled seizures induced by clobenpropit, whereas cimetidine had no effect even at a high dose of 5 microg. These results indicate that clobenpropit protects against pentylenetetrazole-kindled seizures in rats, and that its action is mainly due to the activation of endogenous histamine by blocking autoinhibitory presynaptic histamine H(3) receptors.
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507
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Zhang WB, Shan OQ, Qi Y, Zhang R, Du SH, Chen MS. [Investigation of the status of ophthalmology in China]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 2003; 39:262-6. [PMID: 12892599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
OBJECTIVE To identify the quantity, constitution, distribution, human resources, medical service, equipment utilization conditions of our ophthalmic organizations. METHODS Adopt the ophthalmology status survey forms developed by the Department of Health Administration of Ministry of Health and Office of National Committee for Prevention of Blindness to investigate the registered medical treatment organizations in the whole mainland of China in 1996. The collected data were analyzed using SAS software. RESULTS There were 4,151 ophthalmological organizations, 43,204 beds for ophthalmic patients, 22,577 eye doctors, and 16,448 ophthalmic nurses in China in 1996. 41.55% of eye doctors worked in the general hospitals above the county level. CONCLUSION The distribution of ophthalmic organizations and human resource is uneven. It may be the main cause to restrict the activities for prevention of blindness in China.
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508
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Zheng YJ, Kang Y, Feng YZ, Zhang R, Zhang WB. [Addition internal standard method in chromatographic quantitative analysis]. Se Pu 2001; 19:464-6. [PMID: 12545448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
Internal standard method is a conventional chromatographic quantitative method which requires one or several internal standards added. The internal standard component must not be contained in the sample and need a good separation between the internal standard and sample components. In many cases selecting an internal standard is not convenient or even restricted by the seperation of components. In this paper, we try to combine the internal standard method and the addition method to form a new chromatographic quantitation method named addition internal standard method. The principles of addition internal standard method are suitable to not only chromatographic quantitation but also polarography etc. The related theory and foundation of the method are defined. The operation steps and the conditions suitable to the method are discussed. The advantages and disadvantages of this method are explained in detail.
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509
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Zheng YJ, Li YJ, Zhang WB, Lü ZL. [Study on the determination of NO, AsH3, COS and other impurities in cracked gas by chromatography/mass spectrometry method]. Se Pu 2001; 19:338-40. [PMID: 12545495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
The selected ion monitoring(SIM) mode of capillary column gas chromatography coupled with mass spectrometry has been used for the determination of NO, AsH3, COS, thio-ether, thio-alcohol etc. in gases from catalytic cracking of heavy oils. The interference of CO, CO2, ethylene, ethane and N2 which affected the determination of NO was eliminated by chromatographic separation and subtraction of responses. The interference to the determination of selected ion was studied. Only C2H5SH was affected at m/z = 62 and the interference could be eliminated by using the ions at m/z = 47. The impurities in practical sample gas were determined. The detection limit of NO was 100 nL/L. The detection limits of other impurities were between 15 nL/L and 50 nL/L.
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510
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Li Z, Xu NJ, Wu CF, Xiong Y, Fan HP, Zhang WB, Sun Y, Pei G. Pseudoginsenoside-F11 attenuates morphine-induced signalling in Chinese hamster ovary-mu cells. Neuroreport 2001; 12:1453-6. [PMID: 11388428 DOI: 10.1097/00001756-200105250-00031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Pseudoginsenoside-F11 (PF11), an ocotillol type saponin isolated from Panax quinquefolium L., has been shown to antagonize the behavioral actions of morphine. Biochemical experiments revealed that PF11 could inhibit diprenorphine (DIP) binding with an IC50 of approximately 6.1 microM and reduced the binding potency of morphine in Chinese hamster ovary (CHO)-mu cells. Furthermore, PF11 significantly attenuated morphine-stimulated [35S]GTPgammaS binding in a dose dependent manner, and strongly decreased the efficacy of morphine to inhibit intracellular cAMP production. In addition, PF11 pretreatment could also significantly inhibit naloxone induced cAMP overshoot in the morphine-pretreated cells. However, PF11 per se had no effect on either [35S]GTPgammaS binding or intracellular cAMP accumulation. These data suggested that PF11 antagonized the morphine stimulated opioid receptor signalling directly at the cellular level.
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MESH Headings
- Adenylyl Cyclases/drug effects
- Adenylyl Cyclases/metabolism
- Analgesics, Opioid/antagonists & inhibitors
- Analgesics, Opioid/pharmacology
- Animals
- Binding Sites/drug effects
- Binding Sites/physiology
- Binding, Competitive/drug effects
- Binding, Competitive/physiology
- CHO Cells/cytology
- CHO Cells/drug effects
- CHO Cells/metabolism
- Cell Membrane/drug effects
- Cell Membrane/metabolism
- Cricetinae
- Cyclic AMP/biosynthesis
- Dose-Response Relationship, Drug
- Drug Interactions/physiology
- GTP-Binding Proteins/drug effects
- GTP-Binding Proteins/metabolism
- Ginsenosides
- Guanosine 5'-O-(3-Thiotriphosphate)/pharmacokinetics
- Morphine/antagonists & inhibitors
- Morphine/pharmacokinetics
- Morphine Dependence/drug therapy
- Morphine Dependence/metabolism
- Morphine Dependence/physiopathology
- Narcotic Antagonists/pharmacology
- Receptors, Opioid, mu/agonists
- Receptors, Opioid, mu/antagonists & inhibitors
- Receptors, Opioid, mu/metabolism
- Saponins/pharmacology
- Signal Transduction/drug effects
- Signal Transduction/physiology
- Sulfur Radioisotopes/pharmacokinetics
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511
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Shan YC, Zhao RH, Zhang WB, Zhang YK. [A new method for predicting retention time of solutes under linear gradient elution conditions in RP-HPLC]. Se Pu 2001; 19:256-9. [PMID: 12541812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
A new method for predicting the retention time of solutes under linear gradient elution has been established. In this method, the migration distance of solutes in column and the mobile phase gradient were modified simultaneously according to the distribution of mobile phase in column. The prediction results of retention time of both weakly and strongly retentive solutes were accurate in different instrumental systems using this method. In order to test and verify this method, the retention time of fifteen amino acids and eight homologous compounds of benzene were predicted. The predicted results were compared with those predicted by the method in common use. The relative average errors between predicted and experimental values were 3.70% and 4.90% for the weakly retentive solutes, far smaller than those obtained by the reference method (23.61% and 31.16%). For the strongly retentive solutes, the relative average errors were 0.21% and 6.01% respectively, slightly smaller than those obtained by the reference method (0.81% and 6.69%). It is seen that this new method has many advantages.
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512
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Zhang YK, Zhang QH, Zhang WB, Xu GW. [Advances in chromatography and related techniques in China--status report in 1998-1999]. Se Pu 2001; 19:37-46. [PMID: 12541843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
This report covers developments in chromatography and related techniques in China during the period of 1998-1999. The papers published in 23 domestic and a few foreign periodicals which are closely related to chromatography, and presented at 1999 Beijing Conference and Exhibition on Instrumental Analysis and the 12th National Symposium of Chromatography are reviewed. Specific topic areas covered include gas chromatography (GC), high performance liquid chromatography (HPLC), capillary electrophoresis (CE) and capillary electrochromatography (CEC), solid phase extraction (SPE) and solid phase microextraction (SPME).
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513
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Shen SC, Zhang WB, Cui LX. [Determination of residual acetone in soybean phospholipids by headspace gas chromatography]. Se Pu 2000; 18:571-3. [PMID: 12541755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
Soybean phospholipids have many functions and alimentary actions. In our country, powder soybean phospholipids are generally got by extraction with acetone, followed by vacuum drying. There may be some residual acetone present in the soybean phospholipids, which is harmful to health. So, we must know residual acetone content in the soybean phospholipids. However we have not found a method to determine the residual acetone in the soybean phospholipids. In this paper, headspace GC was used to determine residual acetone in powder soybean phospholipids. The headspace bottle was glass with a volume of 15 milliliters. Certain amounts of water, ammonium sulfate, and sample were added into the bottle. The mixture was made into a brei as soon as possible. The bottle was put into a water bath at 40 degrees C for an hour. The GC column was a 2 m x 3 mm i.d. stainless steel tube packed with GDX-103 stationary phase. Temperatures of both injector and detector were kept at 120 degrees C. Column temperature was 160 degrees C. Injection volume was 1 mL. External standard method was used for quantitation. The RSD was 1.2%. The recoveries in the range of 25.0 micrograms/g-100 micrograms/g were 98.4%-104%.
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514
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Jing Q, Xin SM, Zhang WB, Wang P, Qin YW, Pei G. Lysophosphatidylcholine activates p38 and p42/44 mitogen-activated protein kinases in monocytic THP-1 cells, but only p38 activation is involved in its stimulated chemotaxis. Circ Res 2000; 87:52-9. [PMID: 10884372 DOI: 10.1161/01.res.87.1.52] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Oxidized LDLs (OxLDLs) have been shown to be involved in recruitment of blood monocytes into the arterial subendothelial space, which is the earliest step in atherogenesis, but the underlying molecular mechanisms are poorly understood. The present study demonstrated that lysophosphatidylcholine (LPC), a major phospholipid component of OxLDL, strongly evoked phosphorylation and activation of p38 and p42/44 mitogen-activated protein kinases in monocytic cells. The stimulation of p38 and p42/44 occurred in a dose- and time-dependent manner, reaching the maximal activation at 25 microg/mL LPC within 5 minutes. Interestingly, inhibition of p38 activation by OxLDL or LPC, using its selective inhibitors (SB203580 and SKF86002), completely blocked OxLDL- or LPC-stimulated chemotaxis of THP-1 cells, which was measured in a transwell chemotaxis assay. In contrast, inhibition of p42/44 activation by its potent inhibitor (PD98059) did not block OxLDL- or LPC-stimulated chemotaxis. Moreover, expression of a p38 dominant-negative mutant (p38AF) reduced cell chemotaxis significantly. In addition, activation of p38 by LPC was apparently mediated neither by scavenger receptors nor by tyrosine kinase receptors. It was, however, effectively blocked by pertussis toxin and substantially reduced by phospholipase C inhibitor (U73122) and phosphatidylinositol 3-kinase inhibitors (wortmannin and LY294002). LPC also inhibited forskolin-stimulated cAMP accumulation in a pertussis toxin-sensitive manner, indicating that Gi/Go proteins likely mediated the effects of LPC. Our results suggested that OxLDL/LPC efficiently activated both p38 and p42/44, but only the activation of p38 was functionally associated with OxLDL-/LPC-induced chemotaxis in THP-1 cells.
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515
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Tan ZJ, Zou XW, Zhang WB, Jin ZZ. Structure transition in cluster-cluster aggregation under external fields. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:734-737. [PMID: 11088528 DOI: 10.1103/physreve.62.734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/1999] [Indexed: 05/23/2023]
Abstract
The structure transition in cluster-cluster aggregation (CCA) under different external electric fields has been investigated by computer simulations. The aggregates are generated from off-lattice CCA models involving the field-induced dipolar interactions and temperatures by means of a Metropolis algorithm. When the parameter K increases from 0 to infinity, the clusters gradually change from a diffusion-limited CCA to a chainlike pattern, where K stands for the relative strength of the field-induced dipolar interaction with thermal energy. The relation of fractal dimension D(f) to parameter K can be approximately expressed as D(f)=D(E)+(D(DLCA)-D(E))e(-betaK) with beta=0.64, where D(E) and D(DLCA) stand for the fractal dimensions of the CCA when K-->infinity and K-->0, respectively. This structure transition is a transition between a prototype disorder structure and a relative order one. The transition is attributed to the variation of the dominating interaction of systems from thermal disorder to field-induced dipolar interaction with K rising.
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516
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Xiong JH, Zhang WB, Xu GW, Zhang YK. [Advances in nonaqueous capillary electrophoresis]. Se Pu 2000; 18:218-23. [PMID: 12541558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
Advances in nonaqueous capillary electrophoresis are reviewed with 71 references in this paper. Capillary electrophoresis is generally performed in aqueous buffer. In fact, it can provide some advantages to use organic solvent as a separation medium instead of water. The choice of organic solvent and electrolyte, the detection mode and solute-additive interactions are summarized. Furthermore, the separation of inorganic ions, neural compounds, organic acids, pharmaceuticals, metabolites and chiral substance is also described.
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517
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Zhang WB, Aukland K, Lund T, Wiig H. Distribution of interstitial fluid pressure and fluid volumes in hind-limb skin of rats: relation to meridians? CLINICAL PHYSIOLOGY (OXFORD, ENGLAND) 2000; 20:242-9. [PMID: 10792418 DOI: 10.1046/j.1365-2281.2000.00254.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
To determine the distribution of interstitial fluid pressure (Pi) and volume (Vi), and to relate the distribution of these parameters to the distribution of potential meridians located by measurement of electrical impedance, we measured Pi, extracellular fluid (Ve) and plasma volumes (Vp) in 14 pre-defined skin areas, 2 x 2 mm, and in concave and convex regions on the hind-limb and groin of rats in control conditions. Pi was measured with sharpened glass capillaries connected to a servo-controlled counter-pressure system, while Ve and Vp were determined as the extravascular distribution spaces of 51Cr-EDTA and 125I-human serum albumin, respectively. Vi was calculated as Ve - Vp, and Vw as the difference between skin wet and dry weight. Grand mean Pi averaged -0.81 mmHg (SD 0.83, n=95). Pi in skin was significantly higher in lateral and medial parts of the medial aspect of hind-limb compared to pressures in the intermediate area (P<0.05). Pressures in the concave groin and the convex knee area were more negative and positive, respectively, than in the flat intermediate central hind-limb area. There was a significantly higher Vi (P<0.05) and Vw (P<0.05) in the lateral side than that in the medial side. Vp was higher medially and laterally than in the intermediate area (P<0.05 for both comparisons), and correlated positively and significantly with Pi (r=0.66, P<0.05). No correlation was found between Pi and electrical impedance. The study suggests that the distribution of Pi, Vi, Vp and Vw is heterogeneous in hind-limb skin at a macroscopic level without obvious relations to potential meridians.
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518
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Tan ZJ, Zou XW, Zhang WB, Jin ZZ. Influence of particle size on diffusion-limited aggregation. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1999; 60:6202-5. [PMID: 11970534 DOI: 10.1103/physreve.60.6202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/1999] [Revised: 05/19/1999] [Indexed: 04/18/2023]
Abstract
The influence of particle size on diffusion-limited aggregation (DLA) has been investigated by computer simulations. For DLA clusters consisting of two kinds of particles with different sizes, when large particles are in the minority, the patterns of clusters appear asymmetrical and nonuniform, and their fractal dimensions D(f) increase compared with one-component DLA. With increasing size of large particles, D(f) increases. This increase can be attributed to two reasons: one is that large particles become new growth centers; the other is the big masses of large particles. As the concentration ratio x(n) of large particles increases, D(f) will reach a maximum value D(f(m)) and then decrease. When x(n) exceeds a certain value, the morphology and D(f) of the two-component DLA clusters are similar to those of one-component DLA clusters.
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519
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Zhang Z, Xin SM, Wu GX, Zhang WB, Ma L, Pei G. Endogenous delta-opioid and ORL1 receptors couple to phosphorylation and activation of p38 MAPK in NG108-15 cells and this is regulated by protein kinase A and protein kinase C. J Neurochem 1999; 73:1502-9. [PMID: 10501195 DOI: 10.1046/j.1471-4159.1999.0731502.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The p38 mitogen-activated protein kinase (MAPK) cascade transduces multiple extracellular signals from cell surface to nucleus and is employed in cellular responses to cellular stresses and apoptotic regulation. The involvement of the p38 MAPK cascade in opioid- and opioid receptor-like receptor-1 (ORL1) receptor-mediated signal transduction was examined in NG108-15 neuroblastoma x glioma hybrid cells. Stimulation of endogenous delta-opioid receptor (DOR) or ORL1 resulted in activation of p38 MAPK. It also induced the activation of extracellular signal-regulated kinases (ERKs), another member of the MAPK family, with slower kinetics. Activation of p38 MAPK was abolished by selective antagonists of DOR or ORL1, pretreatment with pertussis toxin, or SB203580, a specific inhibitor of p38 MAPK. Inhibition of p38 MAPK had no significant effect on opioid-induced ERK activation, indicating that p38 MAPK activity was not required for ERK activation, though its stimulation preceded ERK activation. Inhibition of protein kinase A (PKA) strongly diminished p38 activation mediated by DOR or ORL1 but had no significant effect on ERK activation, and protein kinase C (PKC) inhibitors potentiated stimulation of p38 while inhibiting activation of ERKs. Taken together, our results provide the first evidence for coupling of DOR and ORL1 to the p38 MAPK cascade and clearly demonstrate that receptor-mediated activation of p38 MAPK both involves PKA and is negatively regulated by PKC.
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520
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Zhang RU, Wang GL, Zhang PL, Xiong Y, Zhang WB, Wang XP, Yin DL, Jing Q. Suppression of angiotensin II stimulated responses in aortic vascular smooth muscle cells of experimental cirrhotic rats. Cell Res 1999; 9:155-61. [PMID: 10418735 DOI: 10.1038/sj.cr.7290013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Functional responses to angiotensin II (AT-II) were determined in aortic vascular smooth muscle cells (VSMCs) from experimental cirrhotic rats. Our data showed that AT-II-stimulated extracellular acidification rate (ECAR), which was measured by Cytosensor microphysiometry, was significantly reduced in the aortic VSMCs from the cirrhotic rats as compared to those from the control animals. The ability of AT-II to promote formation of inositol phosphates, the second messenger produced by the activation of Gq-coupled receptors, was also considerably suppressed in the cirrhotic VSMCs. Furthermore, the maximal p42/44 MAPK phosphorylation stimulated by AT-II was significantly reduced in the cirrhotic VSMCs in contrast to that in the normal VSMCs. Taken together, our data clearly demonstrated that the functional responses to AT-II was severely suppressed in aortic VSMCs in cirrhosis, indicating the impairment of general Gq-coupled receptor signaling and subsequent biological function in the cirrhotic VSMCs.
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521
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Jing Q, Xin SM, Cheng ZJ, Zhang WB, Zhang R, Qin YW, Pei G. Activation of p38 mitogen-activated protein kinase by oxidized LDL in vascular smooth muscle cells: mediation via pertussis toxin-sensitive G proteins and association with oxidized LDL-induced cytotoxicity. Circ Res 1999; 84:831-9. [PMID: 10205151 DOI: 10.1161/01.res.84.7.831] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Oxidized low-density lipoproteins (oxLDL) have been shown to play a crucial role in atherosclerosis, but the underlying molecular mechanisms have not been fully understood. The present study showed that oxLDL strongly evoked phosphorylation and activation of p38 mitogen-activated protein kinase (MAPK) in rat vascular smooth muscle cells (VSMCs) in concentration- and time-dependent manners, reaching the maximal activation at 100 microg/mL within 5 minutes. The results from immunofluorescence staining also revealed that p38 MAPK was activated by oxLDL in 5 minutes, and the activated p38 MAPK was translocated from cytoplasm to nucleus of VSMCs in 15 minutes. Activation of p38 MAPK by oxLDL was apparently not mediated by their classical scavenger receptors and was not affected by tyrosine kinase inhibitors. However, activation of p38 MAPK was effectively blocked by pretreatment with pertussis toxin and was significantly reduced by phospholipase C inhibitor U-73122. OxLDL also inhibited forskolin-stimulated cAMP accumulation and increased inositol phosphate formation. More interestingly, inhibition of p38 MAPK by its specific inhibitor SB203580 significantly blocked oxLDL-induced cytotoxicity (increased leakage of cytoplasmic lactate dehydrogenase to the culture medium, reduced [3H]thymidine incorporation, and attenuated mitochondrial metabolism of tetrazolium salt, (3-(4, 5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-s ulfophenyl)- 2H-tetrazolium), MTS) in VSMCs, and pretreatment with pertussis toxin also inhibited oxLDL-induced cytotoxicity. Taken together, our data clearly demonstrated that oxLDL effectively activated p38 MAPK in VSMCs, which was likely mediated via pertussis toxin-sensitive G proteins, and the p38 activation was functionally associated with oxLDL-induced cytotoxicity in VSMCs.
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MESH Headings
- Animals
- Aorta, Thoracic/cytology
- Arteriosclerosis/metabolism
- Calcium-Calmodulin-Dependent Protein Kinases/metabolism
- Cell Nucleus/metabolism
- Cells, Cultured
- Cyclic AMP/metabolism
- Cytotoxins/metabolism
- Dextrans/pharmacology
- Enzyme Inhibitors/pharmacology
- GTP-Binding Proteins/physiology
- Imidazoles/pharmacology
- L-Lactate Dehydrogenase/metabolism
- Lipoproteins, LDL/metabolism
- Lipoproteins, LDL/pharmacology
- Male
- Mitogen-Activated Protein Kinases
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/enzymology
- Oxidation-Reduction
- Pertussis Toxin
- Phosphorylation
- Pyridines/pharmacology
- Rats
- Rats, Sprague-Dawley
- Signal Transduction/physiology
- Type C Phospholipases/metabolism
- Tyrphostins/pharmacology
- Virulence Factors, Bordetella/pharmacology
- p38 Mitogen-Activated Protein Kinases
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522
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Zhang WB, Yu WL, Yang YJ. Absence of an analgesic effect of qigong "external qi" in rats. THE AMERICAN JOURNAL OF CHINESE MEDICINE 1998; 26:39-46. [PMID: 9592592 DOI: 10.1142/s0192415x98000063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The analgesic effect of "external Qi" emitted from the Qigong practitioner was investigated in rats. In behavioral experiments, the rat's tail-flick and head-movement threshold measurements were used to determine if the "external Qi" had analgesic effect. The results were negative. In electrophysiological study, the "external Qi" shows no significant changes in the pain-related evoked cortical potentials to tooth-pulp stimulation. Thus the results of this study are different from those reported by other investigators. It is proposed that this research be repeated and extended.
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523
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Fan GH, Zhou TH, Zhang WB, Pei G. Suppression of phospholipase C blocks Gi-mediated inhibition of adenylyl cyclase activity. Eur J Pharmacol 1998; 341:317-22. [PMID: 9543254 DOI: 10.1016/s0014-2999(97)01477-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The potential effect of inhibition of phospholipase C on the response of Gi-coupled receptors was investigated in neuroblastoma x glioma hybrid (NG108-15) cells. The phospholipase C specific inhibitor 1-[6-((17beta-3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl]-1H -pyrrole-2,5-dione (U73122), which did not affect basal and forskolin-stimulated adenylyl cyclase activities, time- and dose-dependently blocked delta-opioid receptor-mediated inhibition of adenylyl cyclase activity, the EC50 (0.5 microM) of which was consistent with that for inhibition of bradykinin-dependent phospholipase C activation (EC50 = 1 microM). U73122 treatment also blocked functional responses of m4 muscarinic receptor and alpha2-adrenoceptor in NG108-15 cells and three opioid receptors (mu, delta and opioid receptor-like receptor (ORL1)) in human neuroblastoma SK-N-SH cells. 1-[6-((17Beta-3-Methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl]-2, 5-pyrrolidinedione (U73343), an inactive analog of U73122, did not show any effect, which suggests that the blockade by U73122 of Gi-coupled receptor-mediated signaling is probably mediated through inhibition of phospholipase C, although a possible direct modification of G proteins can not be excluded. Furthermore, treatment with U73122 but not U73343 blocked the GTP-induced inhibition of adenylyl cyclase, indicating blockade at the level of Gi proteins.
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524
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Fan GH, Zhang WB, Yao CP, Pei G. Modulation by calcium/calmodulin-dependent protein kinase II of functional response of delta opioid receptor in neuroblastoma x glioma hybrid (NG108-15) cells. Neuropharmacology 1997; 36:1763-9. [PMID: 9517449 DOI: 10.1016/s0028-3908(97)00164-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The potential modulation of opioid receptor signaling by calcium/calmodulin-dependent protein kinase II (CaMKII) has been investigated in NG108-15 cells. Both CaMKII specific inhibitors used, KN62 and KN93, time- and dose-dependently blocked inhibition of cAMP accumulation by [D-Pen2, D-Pen5]enkephalin (DPDPE), with an IC50 of about 1.2 microM and 0.8 microM, respectively. In the presence of 1 microM KN62 or KN93, the DPDPE dose-response curve shifted to the right (IC50 from 0.7 to 20 nM for KN62 and from 0.65 to 10 nM for KN93, respectively), and the maximal response was also significantly reduced. KN92, an inactive analogue of KN93, showed no significant impact, while ionomycin, an activator of CaMKII, greatly potentiated the opioid receptor response, suggesting that the effects of KN62, KN93 and ionomycin were likely mediated through CaMKII. In addition, KN62 did not affect ligand binding, receptor/Gi coupling, or basal and forskolin-stimulated adenylyl cyclase activity, suggesting its possible interference in the Gi/adenylyl cyclase interaction. Furthermore, a CaMKII inhibitor potently blocked the functional responses of other Gi-coupled receptors (m4 muscarinic and alpha2 adrenergic receptors) tested, but not that of Gs-coupled receptors (prostaglandin E1 and adenosine receptors). Our results clearly demonstrate that CaMKII modulates the signaling of opioid receptor and other Gi-coupled receptors.
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525
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Lian HZ, Zhang WB, Miao J, Jiang Q, Mao L, Zong L, Li L, Wu XX, Cheng RM. A study on the stability of bronopol in bronopol lotion by ion-paired reversed-phase high performance liquid chromatography. J Pharm Biomed Anal 1997; 15:667-71. [PMID: 9127279 DOI: 10.1016/s0731-7085(96)01895-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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526
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Abstract
OBJECTIVE To study whether glycine, which may contribute to the symptoms of the transurethral resection syndrome promotes death in a mouse model and whether a modification of the glycine concentration offers a better chance of survival. MATERIALS AND METHODS Mortality was determined in 120 mice after an intravenous infusion of increasing volumes and concentrations of glycine solution. The animals were divided into groups of 10 and given 150, 180, 200 or 220 mL/kg body weight of 1.1, 1.5 or 2.2% glycine solution. As a control, 220 mL/kg of a 5% mannitol solution was given to 12 mice. RESULTS After receiving an isosmotic (2.2%) glycine solution 70% of the animals died, while the overall death rate for 1.5% glycine was only 20%. When 1.1% glycine was used, the mortality was 10% after infusion of 150 and 180 mL/kg and 80% after infusion of > or = 200 mL/kg. Logistic regression analysis showed that the outcome for the two highest glycine concentrations was directly related to the dose of glycine and not to the water load. Of 12 mice receiving the isosmotic 5% mannitol solution, three died. CONCLUSIONS A 1.5% glycine solution offered the best chance of survival. The mortality was governed both by the glycine dose (2.2 and 1.5%) and the tendency of the solution to produce overhydration of the cells (1.1%). Glycine toxicity was most important when small volumes were infused.
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527
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Zhang WB, Jiang XH, Xu RM. [Characteristics of CO2 expiration of skin on limb segment of large intestine and stomach meridian]. ZHONGGUO ZHONG XI YI JIE HE ZA ZHI ZHONGGUO ZHONGXIYI JIEHE ZAZHI = CHINESE JOURNAL OF INTEGRATED TRADITIONAL AND WESTERN MEDICINE 1995; 15:625-627. [PMID: 8704431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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528
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Domoto T, Zhang WB, Tsumori T, Oki M. Distribution of extrinsic enkephalin-containing nerve fibers in the rat rectum and their origin in the major pelvic ganglion. JOURNAL OF THE AUTONOMIC NERVOUS SYSTEM 1994; 49:135-46. [PMID: 7806766 DOI: 10.1016/0165-1838(94)90133-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The distribution of nerve fibers containing enkephalin (ENK)-like immunoreactivity was examined in the rectum of aganglionosis rats (AGRs) which completely lack the intramural ganglion cells in the large intestine, and was compared with that of their normal littermates. Furthermore, Met5-enkephalin-Arg6-Gly7-Leu8 (MEAGL)-like immunoreactive neurons projecting to the rectum were examined using retrograde tracing combined with immunohistochemistry in the major pelvic ganglion of normal male rats. In the intermuscular space of the aganglionic rectum of AGRs, unlike the pattern of the normal intermuscular plexus, moderate numbers of ENK-like-immunoreactive fibers were arranged in an irregular, coarse network; greatly diminished numbers of immunoreactive fibers were found in the submucosa. No ENK-like-immunoreactive fibers were seen in the circular muscle layer and mucosa. In the normal rat rectum, ENK-like-immunoreactive fibers were seen throughout all layers, and immunoreactive nerve cells were found predominantly in the myenteric plexus of colchicine-treated animals. Fluoro-Gold injected into the upper rectum labelled numerous principal ganglion neurons in the major pelvic and inferior mesenteric ganglia. Less than 10% of tracer-labelled neurons were positive for fluorescein immunolabelling of MEAGL in the major pelvic ganglion; no immunoreactive neurons were found in the inferior mesenteric ganglion. In the major pelvic ganglion of the colchicine-treated normal rats, about 5% of principal ganglion neurons were immunoreactive for MEAGL. Comparison of serial paraffin sections of the major pelvic ganglion stained for tyrosine hydroxylase (TH), MEAGL and vasoactive intestinal polypeptide (VIP), respectively, revealed that more than half of MEAGL-like immunoreactive neurons were also positive for TH; there was no case showing co-existence of MEAGL with VIP in the principal neurons. These results indicate that a small number of enkephalin-containing neurons in the major pelvic ganglion project to the rectum, and that more than half of these neurons are postganglionic sympathetic. They may terminate mainly in the myenteric ganglia in the rectum.
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529
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Zhang WB, Domoto T, Tsumori T, Agawa S. Nerve fibres containing neuropeptide Y in the atrioventricular valves of Japanese monkey and rat; a light and electron microscopic study. Histol Histopathol 1993; 8:735-8. [PMID: 8305824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Dense distribution of varicose fibres containing neuropeptide Y-like immunoreactivity (NPY-LI) was found in the atrioventricular valves of the Japanese monkey, and moderately in the rat. The immunoelectron microscopy using immunogolds resulted in the localization of NPY-LI within the dense-cored vesicles which existed with the small clear vesicles in the unmyelinated axons near the endocardium. These NPY-LI-containing fibres may participate in regulation of vasomotor role or other functions of the atrioventricular valves.
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530
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Yao ZQ, Yang WS, Chen BF, Shang P, Zhang WB, Chen Y. Purification and characterization of human hepatic stimulator substance. Chin Med J (Engl) 1993; 106:527-32. [PMID: 8243125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Human hepatic stimulator substance (hHSS) was purified from fetal liver with 6,000-fold decrease in protein content and 840-fold increase in specific growth stimulative activity. Purification procedures included the heating of a homogenate in 35% (W/V) Tris-HCL at 95 degrees C for 20 min, high and ultra speed centrifugation, passage over Sephadex G100 gel filtration, DEAE-cellulose ion exchange, TSK G3000 SWG high performance liquid chromatography (HPLC) and YWG C-18 reverse phase HPLC techniques. The most purified material (HP-HSS) revealed cell-specific and dose dependent increase in 3H-TdR incorporation into cellular DNA. As little as 38 ng of the HP-HSS per ml of culture medium produced a 2.5-fold increase in DNA synthesis. Further studies indicate that HP-HSS in combination with insulin and epidermal growth factor stimulate DNA synthesis 16-fold compared with serum and hormone free controls and nearly 3-fold over hepatoma growth with HP-HSS alone. Sodium dedecyl sulfate polyacrylamide gel electrophoresis with silver stain and ultrascan XL laser densitrometer quantitative scanning revealed only one band at 12,800.
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531
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Roche TE, Powers-Greenwood SL, Shi WF, Zhang WB, Ren SZ, Roche ED, Cox DJ, Sorensen CM. Sizing of bovine heart and kidney pyruvate dehydrogenase complex and dihydrolipoyl transacetylase core by quasielastic light scattering. Biochemistry 1993; 32:5629-37. [PMID: 8504083 DOI: 10.1021/bi00072a019] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Quasielastic light scattering (QELS) measurements on several preparations of bovine heart and kidney pyruvate dehydrogenase complex yielded hydrodynamic radii (rH values) ranging from 25.7 to 30 nm. Gel filtration chromatography removed stable aggregates and generated preparations that gave essentially the same rH values of 24.3 +/- 0.6 nm for both complexes. The data were characteristic of a monodisperse system and agree with estimates using cryoelectron microscopy [Wagenknecht et al. (1991) J. Biol. Chem. 266, 24650-24656]. The equivalent hydrodynamic sizes for the heart and kidney complex indicate that the larger number of pyruvate dehydrogenase components in the heart complex (M(r) congruent to 9 x 10(6)) than the kidney complex (M(r) congruent to 7.5 x 10(6)) associate without radial expansion of the heart complex. That accommodation of additional mass is consistent with the space available since even in the more massive complex greater than 80% of the volume within the dimensions of the complex must be occupied by solvent. Preparations of the core of the complex are primarily composed of 60 dihydrolipoyl acetyltransferase (E2) subunits whose inner domains associate to form a pentagonal dodecahedron that is readily observed by electron microscopy (particle radius 10.7-11.3 nm). However, the bulk of E2's mass is present in an exterior multidomain structure. These mobile outer structures are very difficult to observe by standard electron microscopy techniques. Preparations of the core formed stable aggregates that were removed by gel filtration chromatography. QELS measurements gave an rH of 20.1 +/- 0.8 nm.(ABSTRACT TRUNCATED AT 250 WORDS)
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532
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Li Y, Zhang W, Dong S. Cupric hexacyanoferrate colloid doped polypyrrole film modified electrode. ELECTROANAL 1993. [DOI: 10.1002/elan.1140050510] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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533
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Zhang W, Dong S. Effects of dopant and solvent on the properties of polypyrrole: Investigations with cyclic voltammetry and electrochemically in situ conductivity. Electrochim Acta 1993. [DOI: 10.1016/0013-4686(93)85163-s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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534
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Yao ZQ, Yang WS, Zhang WB, Chen Y, Zhou YX. Hepatic stimulator substance from human fetal liver for treatment of experimental hepatic failure. Chin Med J (Engl) 1992; 105:676-83. [PMID: 1458972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The authors previously reported the successful reversal of lethal D-Gal induced hepatic necrosis in rats by human hepatic stimulator substance (hHSS), a liver specific growth factor partially purified from human fetal liver cells, which promoted hepatocyte proliferation. In this study, they further investigated the mechanism of hHSS in improving survival of experimental acute hepatic failure. Our results demonstrated that the level of alanine transaminase and endotoxin in the plasma and lipid peroxides in the liver of chemically poisoned rats were reduced by hHSS to different extent at different periods of observation compared with the saline control group. The apparent recovery of liver function and the increase of 3H-TdR incorporation into hepatic DNA correlated with the morphologic changes observed under light and electron microscopes, showing that the damages inflicted on the cellular and subcellular structure in the liver of hHSS-treated rats were greatly alleviated and rapidly repaired. Therefore, hHSS, which can prevent liver deterioration and promote hepatocyte regeneration, may be a new hepatic stimulator factor readily available for clinical use.
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535
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Ren SZ, Shi WF, Zhang WB, Sorensen CM. Anomalous diffusion in aqueous solutions of gelatin. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:2416-2422. [PMID: 9907263 DOI: 10.1103/physreva.45.2416] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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536
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Li Z, Zhang W, Dong S. Electrolyte effects on the electrochemical polymerization of N-benzylaniline. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0022-0728(91)85006-b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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537
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Zhang WB, Li JS, Li HM. SP-like immunoreactivity in the primary trigeminal neurons projecting to the nucleus tractus solitarii. Brain Res 1991; 558:87-9. [PMID: 1718571 DOI: 10.1016/0006-8993(91)90717-a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Using the double-labeling method of retrograde transport of HRP combined with PAP immunocytochemistry, the neurons containing SP-like immunoreactivity (SPLI) of the trigeminal nerve projecting to the nucleus tractus solitarii (NTS) were examined. HRP-SP double-labeled neurons in the trigeminal ganglion, mainly small or middle-sized, were found after the NTS or the lingual nerve was injected with HRP followed by SP-immunoreaction. These findings demonstrate that the projection of the trigeminal nerve to the NTS contains SPLI.
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538
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Tang YM, Yang WS, Zhang WB, Bai XF. Localization and changes of hemorrhagic fever with renal syndrome virus in lymphocyte subpopulation. Chin Med J (Engl) 1991; 104:673-8. [PMID: 1680612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Double-labeled immunocytochemistry was used for studying the localization and distribution of hemorrhagic fever with renal syndrome virus (HFRSV) antigen in the peripheral blood lymphocyte subpopulations in HFRS patients and the quantitative changes of these subpopulations. It was found that HFRSV might infect different subpopulations of lymphocytes. The infection rate of B cells (31.3%) was significantly higher than that of T cells (8.5%), and the infection rate of CD8+ subpopulation (10.5%) was significantly higher than that of CD4+ subpopulation (6.1%). The infection rates of HLA-DR+ cells and Tac+ cells were 2.5% and less than 0.5%, respectively. From febrile to oliguric stage, the number of CD8+ cells increased gradually, leading to a decrease and reverse of CD4/CD8 ratio, while the number of CD4+ cells remained almost unchanged. The appearance and disappearance of HFRSV in lymphocytes were closely associated with the dynamic changes of CD4/CD8 ratio and HLA-DR and Tac expressions. The results suggested that there were certain differences in HFRSV infectivity of different lymphocyte subpopulations, which might be due to the disorders of immunoregulation and immunopathology of HFRS.
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539
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Zhang WB. [Severe pulmonary tuberculosis and multiple organ failure]. ZHONGHUA JIE HE HE HU XI ZA ZHI = ZHONGHUA JIEHE HE HUXI ZAZHI = CHINESE JOURNAL OF TUBERCULOSIS AND RESPIRATORY DISEASES 1991; 14:38-9, 63-4. [PMID: 1879010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Thirty four cases of severe pulmonary tuberculosis complicated by multiple organ failure were reported. The failure usually started firstly from the lung (70.6%). The various organ failures occurred successively to the heart, brain, liver, kidney, stomach and intestines. The death rate is 58.8 percent. The standard of diagnosis and the measures of prevention and treatment were suggested.
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540
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Yao ZQ, Yang WS, Zhang WB, Chen YN, Yang FY. Human hepatic regenerative stimulator substance: partial purification and biological characterization of hepatic stimulator substance from human fetal liver cells. Hepatology 1990; 12:1144-51. [PMID: 2227812 DOI: 10.1002/hep.1840120512] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Current support or replacement therapies for fulminant acute hepatic failure are frequently very disappointing. In this study, human hepatic stimulator substance--a liver-specific growth factor--was partially purified from human fetal liver cells and characterized by its biological effects. Almost 70-fold protein content was purified with an approximately 80-fold increase in specific growth stimulator activity. Human hepatic stimulator substance proved to be heat-stable, protease-sensitive, organ-specific and species-nonspecific. Human hepatic stimulator substance produced a two- to threefold increase of 3H-thymidine incorporation into hepatic DNA when injected intraperitoneally into growing weanling mice (nonhepatectomized) or regenerating rats (34% hepatectomy). The effects of hHSS in reversing the lethality of D-galactosamine (1.6 gm/kg body weight)-induced hepatic necrosis in rats were further evaluated. A survival rate of 4% (n = 24), 41% (n = 12, p less than 0.05), 33% (n = 12, p less than 0.05), 31% (n = 13, p less than 0.05) and 18% (n = 11, p greater than 0.05) was observed when the rats were injected with 4 ml of saline intraperitoneally, 4 ml of human intact fetal hepatocytes (2.4 x 10(8] intraperitoneally, 4 ml of human hepatic stimulator substance intraperitoneally, 2 ml of twofold concentrated human hepatic stimulator substance intravenously and 1 ml of fourfold human hepatic stimulator substance intramuscularly, respectively, 20 hr after poisoning.(ABSTRACT TRUNCATED AT 250 WORDS)
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541
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Zhang WB, Song SH, Dong SJ. Heterogeneous electron transfer of cytochrome c facilitated by polypyrrole and methylene blue polypyrrole film modified electrodes. J Inorg Biochem 1990; 40:189-95. [PMID: 1963438 DOI: 10.1016/0162-0134(90)80052-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Polypyrrole and methylene blue incorporated polypyrrole thin-film modified electrodes were prepared by the electrochemical polymerization method. These modified electrodes may facilitate heterogeneous electron transfer of cytochrome c with high electrocatalytic activity and good stability. Optical thin-layer spectroelectrochemical techniques were used to determine the characteristics of these electrochemical processes such as formal redox potential (E0), electron transfer number (n), and the apparent rate constant (ks.h0).
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542
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Zhang W, Dong S. Ion-sieving effect of poly(3-methylthiophene) thin film modified glassy carbon electrodes. ACTA ACUST UNITED AC 1990. [DOI: 10.1016/0022-0728(90)85057-c] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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543
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Yao ZO, Yang WS, Zhang WB, Bai XF. The distribution and duration of hantaan virus in the body fluids of patients with hemorrhagic fever with renal syndrome. J Infect Dis 1989; 160:218-24. [PMID: 2569493 DOI: 10.1093/infdis/160.2.218] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The distribution and duration of Hantaan virus (HTNV) in the body fluids of patients were studied by immunofluorescence, reverse passive hemagglutination, and cell culture assays. Virus antigen of hemorrhagic fever with renal syndrome in peripheral blood mononuclear cells (PBMCs) was usually present before day 11 of the disease, especially from days 4-7. Virus isolates were more readily recovered from plasma early in the course of the illness and less frequently after day 7. The use of PBMCs rather than plasma enabled isolates to be recovered at a rate nearly twice that permitted by plasma and allowed the isolation peak of HTNV (days 4-7 after onset of disease) to extend an additional 2 or 3 d, thus prolonging the period of detectable viremia until days 8-11. PBMCs were especially useful in isolating viruses from patients with hemorrhagic fever with renal syndrome in whom antibody titers were generally high during the acute phase of the disease. HTNV was isolated from the cerebrospinal fluid of patients, but was difficult to recover from other body fluids.
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544
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Yao ZQ, Yang WS, Zhang WB, Bai XF. The duration of viremia patients with epidemic hemorrhagic fever. Chin Med J (Engl) 1989; 102:116-9. [PMID: 2570679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The duration of viremia in patients with epidemic hemorrhagic fever (EHF) was studied using immunofluorescence technique and cell culture assays. The duration of virus in plasma of EHF patients was about 1 week, which was concomitant with the febrile phase of the disease. Comparatively, the separation rate of viruses in peripheral blood mononuclear cells (PBMC) was greater (1.8 times) than in plasma, while the detected peak of EHF (in 4-7 days after onset of the disease) was found to be 2 or 3 days less than that of plasma, thus the detectable viremia was prolonged until the 8th to 11th day of the disease. High titre EHF antibody of IgG, TgM was unable to neutralize the virus in human blood. The results revealed that a blood-cell-associated prolonged viremia is one of the characteristics of EHF infection.
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545
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Xu LF, Zhang WB. [Experience in the nursing of 2 infants of very low birth weight]. ZHONGHUA HU LI ZA ZHI = CHINESE JOURNAL OF NURSING 1987; 22:303-4. [PMID: 3677261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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546
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He SX, He YS, Zhang WB, Dong LF. [Correlation between serum and saliva digoxin concentrations in healthy subjects]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1984; 19:928-931. [PMID: 6544565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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547
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He SX, Zhang WB, Zhao SL, Huang TH, Huang BX. [Identifiability of nonlinear compartmental models for plasma protein binding of sulfa drugs]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1983; 4:265-9. [PMID: 6230873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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