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Fang S, Zhang L, Duan M, Zhang J. Preparation of hydrophobically-modified acrylamide copolymers using poly(ethylene imine) as a photoinitiator and its performance evaluation in Bohai oilfield. POLYMER SCIENCE SERIES B 2012. [DOI: 10.1134/s1560090412020030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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202
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Sharma A, Duan M, Chowdhury R, Graiser M, Zhang H, Langston A, Lonial S, Flowers C, Haight A, Waller E. BI-Modal Age Distribution of Patients with Relapsed Hodgkin Lymphoma Undergoing Autologous Stem Cell Transplantation Correlates with Markedly Inferior Survival Among Patients Age 35 Years and Older. Biol Blood Marrow Transplant 2012. [DOI: 10.1016/j.bbmt.2011.12.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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203
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Duan M, Lai X. Improved zero-sum distinguisher for full round Keccak-f permutation. CHINESE SCIENCE BULLETIN-CHINESE 2012. [DOI: 10.1007/s11434-011-4909-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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204
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Duan M, Fang S, Zhang L, Wang F, Zhang P, Zhang J. Shear degradation resistance of star poly(ethyleneimine) - polyacrylamides during elongational flow. E-POLYMERS 2011. [DOI: 10.1515/epoly.2011.11.1.86] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractAn experimental study of the flow-induced scission behaviour of four star hydrolyzed polyacrylamides (HPMA) with different arms during planar elongational flow in a cross-slot flow cell is described. The results showed that the shear stability of linear HPAM in distilled water was not essentially different from star HPAM. Polymer scission was not observed in either system in a shear rate range from 20,000 to 100,000s-1, which can be attributed to the strong polyelectrolyte behaviour of HPAM in distilled water. However, at the same shear rate, the star HPAMs exhibited superior shear stability in comparison to the linear HPAMs in aqueous solutions containing NaCl (CNaCl=0.2-1.0%wt) and, in particular, the initial reduction rate of relative viscosity (R) decreased with the degree of branching of the HPAMs. In addition, it was found that the R of five HPAMs in NaCl aqueous solutions exhibited an exponential dependence on shear rate, in which the coefficient C1 can be used to quantitatively evaluate shear stability. In star HPAM NaCl aqueous solutions, the increase of R with shear rate is very likely due to the decrease of the hydrodynamic radius (Rh) of these HPAMs, while the increase of R with NaCl concentrations can be attributed to the relatively low viscosity of these polymers at high NaCl concentrations.
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Duan M, Berra L, Kumar A, Wilcox S, Safford S, Goulet R, Lander M, Schmidt U. Use of Hypothermia to Allow Low-Tidal-Volume Ventilation in a Patient With ARDS. Respir Care 2011; 56:1956-8. [DOI: 10.4187/respcare.01211] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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206
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Shu DF, Wang LY, Duan M, Deng YS, Meng QW. Antisense-mediated depletion of tomato chloroplast glutathione reductase enhances susceptibility to chilling stress. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2011; 49:1228-37. [PMID: 21530286 DOI: 10.1016/j.plaphy.2011.04.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2011] [Accepted: 04/06/2011] [Indexed: 05/25/2023]
Abstract
A tomato (Lycopersicon esculentum Mill.) chloroplast glutathione reductase gene (LeGR) was isolated and antisense transgenic tomato lines were obtained. Under chilling stress, transgenic plants accumulated more H(2)O(2), leaked more electrolyte and showed lower net photosynthetic rate (Pn), maximal photochemical efficiency of PSII (Fv/Fm) and oxidizable P700 compared with wild-type (WT) plants. Transgenic seedlings were more suppressed in fresh-weight growth and lost more cotyledon chlorophyll. The decrease in the activity of ascorbate peroxidase (APX) was implied to be potentially relevant to the greater accumulation of H(2)O(2) in transgenic plants. Chilling treatment induced more decrease in the level of reducted glutathione (GSH) and redox ratio of glutathione in transgenic plants than in WT plants, but aroused more increase in GSSG in transgenic plants than in WT plants. Total glutathione displayed no change. Besides, chilling stress resulted in greater decreases in the level of reducted ascorbate (AsA), total ascorbate and redox ratio of ascorbate in transgenic plants than in WT plants, but led to equivalent degree of dehydroascorbate (DHA) increase in WT and transgenic plants. These assessments of glutathione-ascorbate cycle revealed that the decrease of glutathione reductase activity in transgenic plants affected glutathione regeneration, and consequently affected ascorbate regeneration and total ascorbate content. This resulted in a greater accumulation of H(2)O(2) and an enhanced sensitivity to chilling stress in transgenic plants. Moreover, a putative concept model of ecophysiological reaction was discussed.
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MESH Headings
- Agrobacterium/genetics
- Agrobacterium/metabolism
- Amino Acid Sequence
- Ascorbate Peroxidases/metabolism
- Ascorbic Acid/metabolism
- Blotting, Northern
- Caulimovirus/genetics
- Caulimovirus/metabolism
- Chlorophyll/analysis
- Chlorophyll/metabolism
- Chloroplasts/enzymology
- Chloroplasts/genetics
- Cloning, Molecular
- Cold Temperature
- DNA, Antisense/genetics
- DNA, Antisense/metabolism
- Fluorescence
- Free Radical Scavengers/metabolism
- Gene Expression Regulation, Plant
- Glutathione/metabolism
- Glutathione Reductase/metabolism
- Hydrogen Peroxide/metabolism
- Solanum lycopersicum/enzymology
- Solanum lycopersicum/genetics
- Solanum lycopersicum/growth & development
- Molecular Sequence Data
- Oxidation-Reduction
- Photosynthesis
- Plants, Genetically Modified/enzymology
- Plants, Genetically Modified/genetics
- Plants, Genetically Modified/growth & development
- Plasmids/genetics
- Plasmids/metabolism
- Protoplasts/metabolism
- RNA, Plant/genetics
- RNA, Plant/isolation & purification
- Reactive Oxygen Species/metabolism
- Sequence Alignment
- Stress, Physiological
- Superoxide Dismutase/metabolism
- Transfection
- Transformation, Genetic
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207
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Zhang L, Duan M, Fang S, Zhang P, Zhang J, Wang F. Synthesis and solution behaviors of star hydrophobically modified acrylamide copolymers. JOURNAL OF POLYMER ENGINEERING 2011. [DOI: 10.1515/polyeng.2011.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Star copolymers of acrylamide and N,N-dimethyl-N-vinylnonadecan-1-aminium chloride (C18DMAAC) were synthesized by photopolymerization in water. Solution behaviors of these star hydrophobically modified acrylamide copolymers (SHMPAMs) with different C18DMAAC contents and the linear hydrophobically modified acrylamide copolymers (LHMPAMs) were characterized. The increase in C18DMAAC content resulted in decreased intrinsic viscosity and increased the Huggins constant for SHMPAMs. Similar results were observed for LHMPAMs. With similar intrinsic viscosity and C18DMAAC content, the Huggins constant of SHMPAMs was much higher than that of LHMPAMs, which could be due to the fact that SHMPAMs had much stronger intramolecular interaction in dilute polymer solutions. In semi-dilute solutions, the apparent viscosity of SHMPAMs was increased with increasing C18DMAAC content, which was similar to that of LHMPAMs. However, SHMPAMs exhibited higher apparent viscosity than LHMPAMs because it had more arms and thus had more chances to form three-dimensional networks in semi-dilute solutions. In the flow-induced scission experiment, SHMPAMs exhibited superior shear stability in comparison with LHMPAMs. When the strain rate was ≈40,000 s-1, the reduction ratios of the apparent viscosities of the four SHMPAMs after the scission were approximately 80%. By contrast, when the strain rate was ≈20,000 s-1, the reduction ratio of the apparent viscosity of LHMPAM-0.40 had already reached around 80%.
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208
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Zhang L, Fang S, Duan M, Wang F, Zhang P, Zhang J, Chang D. Synthesis of Star Hydrophobically Modified Acrylamide Copolymer and its Dilute Solution Behavior in Water. J MACROMOL SCI B 2010. [DOI: 10.1080/00222341003648722] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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209
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Sun WH, Duan M, Shu DF, Yang S, Meng QW. Over-expression of StAPX in tobacco improves seed germination and increases early seedling tolerance to salinity and osmotic stresses. PLANT CELL REPORTS 2010; 29:917-26. [PMID: 20524119 DOI: 10.1007/s00299-010-0878-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 04/20/2010] [Accepted: 05/19/2010] [Indexed: 05/26/2023]
Abstract
Ascorbate peroxidase plays a key role in scavenging reactive oxygen species under environmental stresses and in protecting plant cells against toxic effects. The Solanum lycopersicum thylakoid-bound ascorbate peroxidase gene (StAPX) was introduced into tobacco under the control of the cauliflower mosaic virus 35S promoter. Transformants were selected for their ability to grow on medium containing kanamycin. RNA gel blot analysis confirmed that StAPX was transferred into the tobacco genome and StAPX was induced by salt and osmotic stresses in tomato leaves. Over-expression of StAPX in tobacco improved seed germination rate and elevated stress tolerance during post-germination development. Two transgenic lines showed higher APX activity and accumulated less hydrogen peroxide than wild-type plants after stress treatments. The photosynthetic rates, the root lengths, the fresh and dry weights of the transgenic lines were distinctly higher than those of wild-type plants under stress conditions. Results indicated that the over-expression of StAPX had enhanced tolerance to salt stress and osmotic stress in transgenic tobacco plants.
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210
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Jiang Z, Wang D, Yang S, Duan M, Bu P, Green A, Zhang X. Integrated response toward HIV: a health promotion case study from China. Health Promot Int 2010; 26:196-211. [DOI: 10.1093/heapro/daq044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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211
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Fang S, Duan M, Jiang C, Zhang L, Zhang J. Synthesis and Characterization of Star Polyacrylamides Using Poly(ethylene imine) as a Core via Photopolymerization in Water. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2009. [DOI: 10.1080/10601320903397168] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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212
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Yu C, Wang HS, Yang S, Tang XF, Duan M, Meng QW. Overexpression of endoplasmic reticulum omega-3 fatty acid desaturase gene improves chilling tolerance in tomato. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2009; 47:1102-12. [PMID: 19648018 DOI: 10.1016/j.plaphy.2009.07.008] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Revised: 07/17/2009] [Accepted: 07/17/2009] [Indexed: 05/24/2023]
Abstract
An endoplasmic reticulum-localized tomato omega-3 fatty acid desaturase gene (LeFAD3) was isolated and characterized with regard to its sequence, response to various temperatures and function in transgenic tomato plants. Northern blot analysis showed that LeFAD3 was expressed in all organs tested and was markedly abundant in roots. Meanwhile, the expression of LeFAD3 was induced by chilling stress (4 degrees C), but inhibited by high temperature (40 degrees C). The transgenic plants were obtained under the control of the cauliflower mosaic virus 35S promoter (35S-CaMV). Northern and western blot analyses confirmed that sense LeFAD3 was transferred into tomato genome and overexpressed. Level of linolenic acids (18:3) increased and correspondingly level of linoleic acid (18:2) decreased in leaves and roots. After chilling stress, the fresh weight of the aerial parts of transgenic plants was higher than that of the wild type (WT) plants, and the membrane system ultrastructure of chloroplast in leaf cell and all the subcellular organelles in root tips of transgenic plants kept more intact than those of WT. Relative electric conductivity increased less in transgenic plants than that in WT, and the respiration rate of the transgenic plants was notably higher than that of WT. The maximal photochemical efficiency of PSII (F(v)/F(m)) and the O(2) evolution rate in WT decreased more than those in transgenic plants under chilling stress. Together with other data, results showed that the overexpression of LeFAD3 led to increased level of 18:3 and alleviated the injuries under chilling stress.
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213
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Duan M, Zhang T, Hu W, Sundström LF, Wang Y, Li Z, Zhu Z. Elevated ability to compete for limited food resources by 'all-fish' growth hormone transgenic common carp Cyprinus carpio. JOURNAL OF FISH BIOLOGY 2009; 75:1459-1472. [PMID: 20738625 DOI: 10.1111/j.1095-8649.2009.02393.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Food consumption, number of movements and feeding hierarchy of juvenile transgenic common carp Cyprinus carpio and their size-matched non-transgenic conspecifics were measured under conditions of limited food supply. Transgenic fish exhibited 73.3% more movements as well as a higher feeding order, and consumed 1.86 times as many food pellets as their non-transgenic counterparts. After the 10 day experiment, transgenic C. carpio had still not realized their higher growth potential, which may be partly explained by the higher frequency of movements of transgenics and the 'sneaky' feeding strategy used by the non-transgenics. The results indicate that these transgenic fish possess an elevated ability to compete for limited food resources, which could be advantageous after an escape into the wild. It may be that other factors in the natural environment (i.e. predation risk and food distribution), however, would offset this advantage. Thus, these results need to be assessed with caution.
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214
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Duan M, Fang S, Guo H, Zhang L. Viscometric Studies of Interactions between Hydrophobically Modified Acrylamide Copolymer and Poly(N-isopropylacrylamide) in Dilute Solutions. J MACROMOL SCI B 2009. [DOI: 10.1080/00222340902956160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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215
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Zhang L, Duan M, Fang S, Zhang J. A Novel Thermothickening Aqueous System Prepared from Hydrophobically-Modified Acrylamide Copolymer, Poly(N-isopropylacryl-amide) and Sodium Dodecyl Benzene Sulfonate and Its Mechanism Studies. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2009. [DOI: 10.1080/10601320903004582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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216
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Duan M, Zhou Z, Lin RX, Yang J, Xia XZ, Wang SQ. In vitro and in vivo Protection against the Highly Pathogenic H5N1 Influenza virus by an Antisense Phosphorothioate Oligonucleotide. Antivir Ther 2008. [DOI: 10.1177/135965350801300112] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background Current vaccination strategies and antiviral drugs only provide limited protection against influenza virus infection. In this study, we investigated the use of a novel antisense oligonucleotide (named IV-AS), which is specific for the 5’-terminal conserved sequence found in all eight viral RNA segments of influenza A virus. Methods The activity of IV-AS was monitored both in vitro, in Madin-Darby canine kidney (MDCK) cells, and in vivo using a mouse model. IV-AS was given intranasally to H5N1-infected mice once daily for 6 days starting 6 h after infection. A three-base mismatch of IV-AS was used as a control. Results IV-AS inhibited influenza virus A induced cytopathic effects in MDCK cells with the 50% effective concentration (EC50) ranging from 2.2 to 4.4 μM. IV-AS was effective against H5N1 virus in preventing death, lessening weight reduction, inhibiting lung consolidation and reducing lung virus titres. Dosages of 40 and 60 mg/kg/day provided 40% and 60% survival rates and prolonged mean survival days in comparison with the infected control group ( P<0.05). The lung index in mice treated with IV-AS, at a dose of 20, 40 or 60 mg/kg/day, had been inhibited on day 4 or 6 ( P<0.05 or P<0.01); virus titres in lung had declined to 2.42, 1.51 and 1.54 log10 TCID50/g of lung, respectively, whereas the yields in the infected control mice were 6.00 log10 TCID50/g of lung. Conclusions Our results suggest that the 5’-terminal conserved region of influenza A virus RNA segments can be targeted using antisense technology; therefore, IV-AS is a potential drug for prophylaxis and control of influenza virus infections.
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217
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Tian LL, Wang XJ, Sun YN, Li CR, Xing YL, Zhao HB, Duan M, Zhou Z, Wang SQ. Salvianolic acid B, an antioxidant from Salvia miltiorrhiza, prevents 6-hydroxydopamine induced apoptosis in SH-SY5Y cells. Int J Biochem Cell Biol 2008; 40:409-22. [PMID: 17884684 DOI: 10.1016/j.biocel.2007.08.005] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Revised: 08/06/2007] [Accepted: 08/07/2007] [Indexed: 11/17/2022]
Abstract
Oxidative stress caused by dopamine may play an important role in the pathogenesis of Parkinson's disease. Salvianolic acid B is an antioxidant derived from the Chinese herb, Salvia miltiorrhiza. In this study, we investigated the neuroprotective effect of salvianolic acid B against 6-hydroxydopamine-induced cell death in human neuroblastoma SH-SY5Y cells. Pretreatment of SH-SY5Y cells with salvianolic acid B significantly reduced 6-hydroxydopamine-induced generation of reactive oxygen species, and prevented 6-hydroxydopamine-induced increases in intracellular calcium. Our data demonstrated that 6-hydroxydopamine-induced apoptosis was reversed by salvianolic acid B treatment. Salvianolic acid B reduced the 6-hydroxydopamine-induced increase of caspase-3 activity, and reduced cytochrome C translocation into the cytosol from mitochondria. The 6-hydroxydopamine-induced decrease in the Bcl-x/Bax ratio was prevented by salvianolic acid B. Additionally, salvianolic acid B decreased the activation of extracellular signal-regulated kinase and induced the activation of 6-hydroxydopamine-suppressed protein kinase C. These results indicate that the protective function of salvianolic acid B is dependent upon its antioxidative potential. Our results strongly suggest that salvianolic acid B may be effective in treating neurodegenerative diseases associated with oxidative stress.
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218
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Duan M, Zhou Z, Lin RX, Yang J, Xia XZ, Wang SQ. In vitro and in vivo protection against the highly pathogenic H5N1 influenza virus by an antisense phosphorothioate oligonucleotide. Antivir Ther 2008; 13:109-114. [PMID: 18389905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
BACKGROUND Current vaccination strategies and antiviral drugs only provide limited protection against influenza virus infection. In this study, we investigated the use of a novel antisense oligonucleotide (named IV-AS), which is specific for the 5'-terminal conserved sequence found in all eight viral RNA segments of influenza A virus. METHODS The activity of IV-AS was monitored both in vitro, in Madin-Darby canine kidney (MDCK) cells, and in vivo using a mouse model. IV-AS was given intranasally to H5N1-infected mice once daily for 6 days starting 6 h after infection. A three-base mismatch of IV-AS was used as a control. RESULTS IV-AS inhibited influenza virus A induced cytopathic effects in MDCK cells with the 50% effective concentration (EC50) ranging from 2.2 to 4.4 microM. IV-AS was effective against H5N1 virus in preventing death, lessening weight reduction, inhibiting lung consolidation and reducing lung virus titres. Dosages of 40 and 60 mg/kg/day provided 40% and 60% survival rates and prolonged mean survival days in comparison with the infected control group (P<0.05). The lung index in mice treated with IV-AS, at a dose of 20, 40 or 60 mg/kg/day, had been inhibited on day 4 or 6 (P<0.05 or P<0.01); virus titres in lung had declined to 2.42, 1.51 and 1.54 log10 TCID50/g of lung, respectively, whereas the yields in the infected control mice were 6.00 log10 TCID50/g of lung. CONCLUSIONS Our results suggest that the 5'-terminal conserved region of influenza A virus RNA segments can be targeted using antisense technology; therefore, IV-AS is a potential drug for prophylaxis and control of influenza virus infections.
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Yu M, Shao D, Feng X, Duan M, Xu J. Effects of ketamine on pulmonary TLR4 expression and NF-kappa B activation during endotoxemia in rats. ACTA ACUST UNITED AC 2007; 29:395-9. [DOI: 10.1358/mf.2007.29.6.1119165] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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220
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Feng X, Ren B, Xie W, Huang Z, Liu J, Guan R, Duan M, Xu J. Influence of hydroxyethyl starch 130/0.4 in pulmonary neutrophil recruitment and acute lung injury during polymicrobial sepsis in rats. Acta Anaesthesiol Scand 2006; 50:1081-8. [PMID: 16987337 DOI: 10.1111/j.1399-6576.2006.01113.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Acute lung injury (ALI) is a progressive syndrome associated with significant mortality in sepsis patients. Neutrophils are key cells in the inflammatory response that characterizes ALI. This study was designed to explore the effects of hydroxyethyl starch (HES) 130/0.4 (a novel plasma substitute) on pulmonary neutrophil recruitment and associated ALI in a rat sepsis model induced by cecal ligation and puncture (CLP). METHODS Animals were randomly assigned to six groups [saline control; CLP and saline; CLP and HES (7.5, 15 and 30 ml/kg); and HES control], subjected to CLP and infused with or without HES 130/0.4 4 h after CLP. Six hours later, the pulmonary capillary permeability (PCP), myeloperoxidase (MPO) activity, lung histological changes, tumor necrosis factor-alpha, interleukin-1beta and cytokine-induced neutrophil chemoattractant levels, P-selectin mRNA expression and nuclear factor-kappa B (NF-kappaB) activation were measured. RESULTS Resuscitation with HES 130/0.4 significantly attenuated the CLP-induced increase in PCP, MPO activity, cytokine/chemokine levels, mRNA expression of P-selectin and NF-kappaB activation, all of which are involved in the recruitment of neutrophils. Groups receiving the higher doses of HES 130/0.4 (15 and 30 ml/kg) were more adequately resuscitated. CONCLUSION HES 130/0.4 can inhibit CLP-induced neutrophil recruitment and subsequent ALI by attenuating cytokines/chemokines, adhesion molecule-mediated inflammation and NF-kappaB activation.
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221
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Regala C, Duan M, Zou J, Salminen M, Olivius P. Xenografted fetal dorsal root ganglion, embryonic stem cell and adult neural stem cell survival following implantation into the adult vestibulocochlear nerve. Exp Neurol 2005; 193:326-33. [PMID: 15869935 DOI: 10.1016/j.expneurol.2004.12.027] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Revised: 12/19/2004] [Accepted: 12/20/2004] [Indexed: 01/27/2023]
Abstract
Sensorineural hearing loss is a disabling condition. In the post-embryonic and adult mammalian inner ear, the regeneration of auditory hair cells, spiral ganglion neurons or their axons does not occur naturally. This decrease in excitable neurons limits the success of auditory rehabilitation. Allografts and xenografts have shown promise in the treatment of a variety of neurological diseases. Fetal dorsal root ganglion (DRG) neurons can extend functional connections in the rat spinal cord. Embryonic stem cells (ES cells) and adult neural stem cells (ANSC) have the potential to differentiate into neurons. We have implanted embryonic days (E) 13-16 fetal mouse DRGs from transgenic mouse lines that express Enhanced Green Fluorescent Protein (EGFP) or lacZ reporter genes, EGFP-expressing ES cells or lacZ-expressing ANSC into the injured vestibulocochlear nerve of adult rats and guinea pigs. Survival of the implants was assessed 2 to 4 weeks postoperatively. For further evaluation of the differentiation of the implanted ES-cells, we double labeled with the mouse-specific neuronal antibody Thy 1.2. The rats implanted with EGFP- or lacZ-expressing DRGs showed labeled DRGs after sacrifice. In addition, EGFP-positive nerve fibers were seen growing within the proximal nerve. The results from the EGFP ES cells and lacZ ANSC revealed reporter-expressing cells at the site of injection in the vestibulocochlear nerve of the host rats and guinea pigs but also within the brain stem. Thy 1.2 profiles were seen among the EGFP ES cells within the 8th cranial nerve. The findings of this study indicate that the vestibulocochlear nerve of adult rats and guinea pigs will support xenotransplants of embryonic DRG, ES cells and ANSC. This may have future clinical applicability in recreating a neuronal conduit following neuronal injury between the inner ear and the central nervous system (CNS).
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Yang J, Li W, Duan M, Zhou Z, Lin N, Wang Z, Sun J, Xu J. Large dose ketamine inhibits lipopolysaccharide-induced acute lung injury in rats. Inflamm Res 2005; 54:133-7. [PMID: 15883747 DOI: 10.1007/s00011-004-1334-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Sepsis is associated with the highest risk of progression to acute lung injury or the acute respiratory distress syndrome. Ketamine has been advocated for anesthesia in endotoxemic and other severely ill patients because it is a cardiovascular stimulant. Our study was designed to investigate the effect of ketamine on the endotoxin-induced acute lung injury in vivo. MATERIALS AND METHODS Adult male Wistar rats were randomly divided into 6 groups: saline controls; rats challenged with endotoxin (5 mg/kg) and treated with saline; challenged with endotoxin (5 mg/kg) and treated with ketamine (0.5 mg/kg); challenged with endotoxin (5 mg/kg) and treated with ketamine (5 mg/kg); challenged with endotoxin (5 mg/kg) and treated with ketamine (50 mg/kg); saline injected and treated with ketamine (50 mg/kg). TNF-alpha, IL-6 and NF-kappa B were investigated in the tissues of the lung after 2 h. Myeloperoxidase (MPO) activity and wet/dry weight ratio were investigated 6 h later. RESULTS We demonstrated that intravenous administration of endotoxin could provoke significant lung injury, which was characterized by increase of MPO activity and wet/dry weight ratio, TNF-alpha and IL-6 expression and NF-kappa B activation. Ketamine (5, 50 mg/kg) inhibited endotoxin-induced NF-kappa B activation. Ketamine only at a dose of 50 mg/kg inhibited TNF-alpha and IL-6 production, and decreased MPO activity and wet/dry weight ratio after endotoxin challenge. CONCLUSIONS Ketamine, only at a supra-anesthetic dosage, could inhibit endotoxin-induced pulmonary inflammation in vivo.
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223
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Duan M, Ren DM, Hu XQ. Study of the interactions between hydrophobically modified polyacrylamide and poly(N-isopropylacrylamide) in water by polymer solvent method. Polym Bull (Berl) 2005. [DOI: 10.1007/s00289-005-0359-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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224
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Duan M, Wang L, Cao Y, Li Z, Yang W, Rao X, Xiao K. Results of surgical treatment of congenital cystic lung disease. Thorac Cardiovasc Surg 2005; 53:61-4. [PMID: 15692922 DOI: 10.1055/s-2004-830387] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To review the experience with surgical intervention for congenital cystic lung disease (CCLD). METHODS From April 1988 to December 2001, 68 patients were diagnosed and treated surgically for CCLD. There were 27 males and 41 females ranging in age from 2 to 65 years. The majority of the cases were diagnosed by history, clinical manifestations and chest radiography or computerized tomography (CT). There were 25 (36.8 %) right-sided and 43 (63.2 %) left-sided cystic lung lesions. Four patients had massive bleeding and needed urgent or emergency operation. Pneumonectomy, lobectomy, and/or segmentectomy were performed. RESULTS 29 (42.6 %) patients underwent lobectomy, 25 (36.8 %) had total pneumonectomy, 9 (13.2 %) lobectomy plus segmentectomy, and 5 (7.4 %) bilobectomy. During the operation, left-sided pulmonary sequestration was confirmed in 3 patients. No death occurred in this series. Diagnoses were confirmed by pathology in all cases. Two patients had malignant lesions arising from multicystic lung lesions. CONCLUSIONS A history of recurrent pneumonia, often with hemoptysis and subsequent dyspnea, should raise the suspicion of CCLD. The diagnosis can be confirmed by chest X-ray and CT preoperatively, and early surgical intervention may avoid the development of serious complications. Delayed diagnosis and surgical management usually result in significant morbidity and mortality.
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Duan M, Hu X, Ren D. Effects of poly(N-isopropylacrylamide) on the solution properties of hydrophobically modified acrylamide copolymer. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/polb.20376] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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