651
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Ou L, Zhang Y, Li W, Furlani D, Gäbel R, Wang W, Wang L, Liebold A, Steinhoff G, Ma N. Directional migration of c-Kit+ cells to infarcted myocardium by anti-c-kit antibody. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1246868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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652
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Furlani D, Ugurlucan M, Bieback K, Pittermann E, Westien I, Yerebakan C, Li W, Vollmar B, Steinhoff G, Ma N. Intravascular transplantation of mesenchymal stem cells leads to embolism in SCID mouse. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1246869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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653
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Gäbel R, Sorg H, Furlani D, Frank J, Polchow B, Bieback K, Li W, Steinhoff G, Ma N. Comparison of the functional benefit upon intracardiac transplantation of mesenchymal stem cells obtained from different human tissues. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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654
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Kaminski A, Klopsch C, Yerebakan C, Gäbel R, Eisert F, Hasken S, Kreitz S, Wegner K, Herz M, Lange M, Lottenburger J, Jockenhoevel S, Ma N, Liebold A, Steinhoff G. Heart valve tissue engineering with autologous CD133+ stem cell-plus-fibrin composite spray – an in-vitro feasibility study. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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655
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Ou L, Li W, Zhang Y, Gäbel R, Furlani D, Wang W, Wang L, Kong D, Steinhoff G, Ma N. Intramyocardial injection of emulsified matrigel demonstrates enhanced angiogenesis and improved cardiac function in a rat myocardium infarction model. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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656
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Liu QL, Xu KD, Ma N, Zeng L, Zhao LJ. Isolation and functional characterization of DgZFP: a gene encoding a Cys2/His2-type zinc finger protein in chrysanthemum. Mol Biol Rep 2010; 37:1137-42. [PMID: 19821150 DOI: 10.1007/s11033-009-9886-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2009] [Accepted: 10/02/2009] [Indexed: 10/20/2022]
Abstract
A Cys2/His2-type zinc finger protein gene, DgZFP, was isolated from chrysanthemum by rapid amplification of cDNA ends (RACE) approach. The DgZFP encodes a protein of 211 amino acids residues with a calculated molecular mass of 22.9 kDa and theoretical isoelectric point is 8.59. DgZFP contains two Cys2/His2-type zinc finger motifs, one nuclear localization domain, one Leu-rich domain, and one ethylene-responsive element-binding factor (ERF)-associated amphiphilic repression (EAR) domain. The transcript of DgZFP was enriched in flowers than in roots, stems, and leaves of the adult chrysanthemum plants. The gene expression was strongly induced by NaCl, drought and cold treatment, and weakly by ABA treatment in the seedlings. Subcellular localization revealed that DgZFP was localized preferentially distributed to nucleus. Overexpression of DgZFP improved salt tolerance and resulted in growth suppression in transgenic tobacco. We argued that DgZFP is a new member of the Cys2/His2-type zinc finger protein genes, and it maybe function as a regulator in response to salt stress in plants.
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657
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Yerebakan C, Niefeldt S, Prietz S, Klopsch C, Gäbel R, Kaminski A, Goldammer T, Rebl A, Zeisig V, Boltze J, Vollmar B, Ma N, Liebold A, Sandica E, Steinhoff G. Right ventricular diastolic performance is enhanced by intramyocardial Erythropoietin administration after surgically induced pressure overload. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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658
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Ma N, Tulu US, Ferenz NP, Fagerstrom C, Wilde A, Wadsworth P. Poleward transport of TPX2 in the mammalian mitotic spindle requires dynein, Eg5, and microtubule flux. Mol Biol Cell 2010; 21:979-88. [PMID: 20110350 PMCID: PMC2836978 DOI: 10.1091/mbc.e09-07-0601] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
TPX2 is a spindle assembly factor that is required for MT assembly near chromosomes. Using photoactivation of fluorescence, we report that TPX2 is transported poleward in the half-spindle. Poleward transport of TPX2 is sensitive to inhibition of dynein or Eg5, and to suppression of MT flux. TPX2 is a Ran-regulated spindle assembly factor that is required for kinetochore fiber formation and activation of the mitotic kinase Aurora A. TPX2 is enriched near spindle poles and is required near kinetochores, suggesting that it undergoes dynamic relocalization throughout mitosis. Using photoactivation, we measured the movement of PA-GFP-TPX2 in the mitotic spindle. TPX2 moves poleward in the half-spindle and is static in the interzone and near spindle poles. Poleward transport of TPX2 is sensitive to inhibition of dynein or Eg5 and to suppression of microtubule flux with nocodazole or antibodies to Kif2a. Poleward transport requires the C terminus of TPX2, a domain that interacts with Eg5. Overexpression of TPX2 lacking this domain induced excessive microtubule formation near kinetochores, defects in spindle assembly and blocked mitotic progression. Our data support a model in which poleward transport of TPX2 down-regulates its microtubule nucleating activity near kinetochores and links microtubules generated at kinetochores to dynein for incorporation into the spindle.
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659
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Ferenz NP, Ma N, Lee WL, Wadsworth P. Imaging protein dynamics in live mitotic cells. Methods 2010; 51:193-6. [PMID: 20085816 DOI: 10.1016/j.ymeth.2010.01.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Indexed: 11/26/2022] Open
Abstract
To ensure that genetic material is accurately segregated during mitosis, eukaryotic cells assemble a mitotic spindle, a dynamic structure composed of microtubules and associated regulatory, structural and motor proteins. Although much has been learned in the past decades from direct observations of live cells expressing fluorescently tagged spindle proteins, a complete understanding of spindle assembly requires a detailed analysis of the dynamic behavior of component parts. Proteins tagged with conventional fluorophores, however, make such an analysis difficult because all of the molecules are uniformly fluorescent. To alleviate this problem, we have tagged proteins with a photoactivatable variant of GFP (PA-GFP), thereby allowing one to follow the behavior of a subset of tagged molecules in the cell. Here, we describe methods to tag and express proteins with PA-GFP, locally photoactivate the recombinant protein and record the dynamic behavior of the photoactivated molecules in live cells. We provide examples of photoactivable proteins in mammalian and yeast cells to illustrate the power of this approach to examine the dynamics of spindle formation and function in diverse cells.
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660
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Ma N, Xia Y, Prasanna V. Exact Inference on Manycore Processors using Pointer Jumping. INFORMATICS 2010. [DOI: 10.2316/p.2010.724-064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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661
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Nesselmann C, Li W, Ma N, Steinhoff G. Stem cell-mediated neovascularization in heart repair. Ther Adv Cardiovasc Dis 2009; 4:27-42. [PMID: 20042449 DOI: 10.1177/1753944709353338] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Accumulating clinical and experimental evidence indicates that stem cells from various sources are promising in the treatment of cardiac dysfunction. They may be incorporated into neovascular foci and thus contribute to postnatal physiological and pathological vasculogenesis and/or produce a variety of growth factors for angiogenesis and cytokines that home other stem cells from other organs for cardiac regeneration. This review focuses on the neovascularization of stem cells from different sources in cardiac repair, with emphasis on adult stem cells.
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662
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Yuan JP, Yue WP, Su C, Wu Z, Ma Z, Pan YT, Ma N, Hu ZY, Shi F, Yu ZL, Wu YS. Patent activity on water pollution and treatment in China—a scientometric perspective. Scientometrics 2009. [DOI: 10.1007/s11192-009-0126-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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663
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Jiang WJ, Du B, Hon SFK, Jin M, Xu XT, Ma N, Gao F, Dong KH. Do patients with basilar or vertebral artery stenosis have a higher stroke incidence poststenting? J Neurointerv Surg 2009; 2:50-4. [PMID: 21990559 DOI: 10.1136/jnis.2009.000356] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND AND AIM Posterior circulation stenosis may be a risk factor associated with stroke after intracranial stenting as compared with anterior circulation stenosis. Our aim was to test our hypothesis that there was no difference in clinical outcome poststenting between patients with severe stenosis of the basilar artery (BA) and intracranial vertebral artery (VA). METHODS Using the Cox proportional hazards regression model adjusted for prespecified factors (qualifying event, and timing of stenting after the qualifying event), we compared primary endpoint (ischemic stroke in the vertebrobasilar territory, including any stroke or death within 30 days of stenting) between patients with severe symptomatic atherosclerotic BA and VA stenosis who underwent elective stenting in our prospective database. Analysis was by intention-to-treat principle. RESULTS Primary endpoint event occurred in 13 (18.8%) of 69 patients with BA stenosis during a mean 23.4 months (9 within 30 days and 4 afterward) and 3 (4.3%) of 70 patients with VA stenosis during a mean 26.4 months (2 within 30 days and 1 afterward). Patients with BA stenosis had a significantly higher risk of the primary endpoint (adjusted HR=4.87, 95% CI 1.37 to 17.29; p=0.014) or any stroke or death within 30 days of stenting (adjusted HR=5.13, 95% CI 1.10 to 23.96; p=0.038) than those with VA stenosis. CONCLUSION A significantly higher stroke risk poststenting exists in patients with severe BA stenosis than those with VA stenosis. The discrepancy in clinical outcome after stenting between patients with BA and VA stenosis should be considered in clinical practice and stenting trials.
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664
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Wang W, Li W, Ong LL, Lutzow K, Lendlein A, Furlani D, Gabel R, Kong D, Wang J, Li RK, Steinhoff G, Ma N. Localized and sustained SDF-1 gene release mediated by fibronectin films: A potential method for recruiting stem cells. Int J Artif Organs 2009; 32:141-9. [PMID: 19440989 DOI: 10.1177/039139880903200304] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Gene-activated matrix has wide potential utilization in tissue engineering. It may genetically modify cells with plasmid DNA encoding therapeutic genes and allow sustained expression and release of the proteins to surrounding tissues. In this study, we assessed the feasibility of the local gene release from human fibronectin (HFN) substrate and the efficacy of local release of stromal cell-derived factor-1 (SDF-1) gene on c-kit+ cell homing. Cationic polymer polyethylenimine (25kDa PEI) was used as non-viral DNA vector. Gene-activated HFN (GAH) was prepared by mixing PEI/DNA complexes with HFN substrate. The DNA retardation, the complex size, and the DNA release speed from the GAH were studied. The in vitro transfection was optimized by luciferase expression and cell viability assay in the COS7 cell line. Localized gene expression in COS7 cells cultured on the GAH was assessed by LacZ and GFP-N3-SDF-1 marker genes. Ckit+ cell homing was investigated in response to the local in vitro SDF-1 expression from rat mesenchymal stem cells (RMSCs) cultured on GAH. Results showed GAH allows long time-sustained DNA release, localized gene delivery, and high transfection efficiency. Local SDF-1 expression with GAH is a promising method to induce targetable stem cell homing.
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665
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Tong Z, Hong B, Yang Y, Li Q, Ma N, Ma C, Gao J. Overexpression of two chrysanthemum DgDREB1 group genes causing delayed flowering or dwarfism in Arabidopsis. PLANT MOLECULAR BIOLOGY 2009; 71:115-29. [PMID: 19544047 DOI: 10.1007/s11103-009-9513-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2009] [Accepted: 05/31/2009] [Indexed: 05/23/2023]
Abstract
We isolated 13 DREB1 (dehydration responsive element binding factor 1) genes from chrysanthemum and further divided them into three groups, DgDREB1A, DgDREB1B and DgDREB1C, based on the phylogenetic analysis. Each group showed their unique expression patterns under cold, dehydration and salt stress conditions. Arabidopsis plants overexpressing DgDREB1A (1A plants) exhibited significantly stronger tolerance to freezing and drought than those overexpressing DgDREB1B (1B plants) and the control plants. In addition, 1A plants showed delayed flowering, but not dwarfism; while 1B plants showed dwarfism, but not delayed flowering. In 1A plants, the expression of three stress-related DREB1-downstream genes, COR47, COR15A, and RD29A, was strongly induced while the expression of CO and FT, two photoperiod responsive flowering-time genes, was inhibited. In 1B plants, the expression of GA2ox7, a GA-deactivation enzyme gene, was dramatically enhanced. The results above strongly suggest that members from different DgDREB1 groups may have distinct effects on plant development: DgDREB1A may be involved in photoperiod-related flowering-time determination and DgDREB1B in GA-mediated plant development.
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666
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Qiao GH, Shan AS, Ma N, Ma QQ, Sun ZW. Effect of supplemental Bacillus cultures on rumen fermentation and milk yield in Chinese Holstein cows. J Anim Physiol Anim Nutr (Berl) 2009; 94:429-36. [PMID: 19663976 DOI: 10.1111/j.1439-0396.2009.00926.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Two experiments were conducted to study the effect of supplemental 100 g/day of live Bacillus cultures (2 x 10(11) cell of Bacillus subtilis and Bacillus licheniformis) on rumen fermentation as well as milk yield and composition in Chinese Holstein cows. In experiment 1, investigating 3 x 10 cows, milk yield and milk protein were increased by using B. licheniformis (p < 0.05) in comparison with an unsupplemented group and the B. subtilis group. Body weight was not significantly affected by Bacillus culture supplementation (p > 0.05). Percentage of milk fat and lactose was not significantly different between treatments (p > 0.05). But milk protein increased with B. licheniformis supplementation (p < 0.05). In experiment 2, carried out with three non-lactating ruminally and duodenally fistulated cows, results showed that B. licheniformis supplementation increased microbial crude protein flow into duodenum (p < 0.05) and decreased the ammonia nitrogen concentration in ruminal fluid at 0.5 h, 1 h, 3 h, 6 h after morning feeding (p < 0.05). Bacillus licheniformis supplementation increased total VFA and acetate concentration in ruminal fluid at 0.5 h, 1 h, 3 h, 6 h after morning feeding (p < 0.05). Bacillus subtilis had no significant effect on rumen fermentation characteristics, duodenal microbial N flow and ruminal apparent nutrient digestibility (p > 0.05). Bacillus licheniformis increased ruminal apparent nutrient digestibility of neutral detergent fibre, acid detergent fibre, and organic matter (p < 0.05).
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667
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Ugurlucan M, Furlani D, Ong LL, Yerebakan C, Wang WW, Gungor F, Ma N, Steinhoff G. Retraction: Mesenchymal Stem Cells: Are They Suitable for Systemic Injection? An In Vitro Study. Angiology 2009:0003319709335033. [PMID: 19497927 DOI: 10.1177/0003319709335033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This article is being retracted because another article was published using the same data, but under a different title, in Microvascular Research.
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668
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Amann L, Halene T, Ehrlichman R, Luminais S, Ma N, Abel T, Siegel S. Chronic ketamine impairs fear conditioning and produces long-lasting reductions in auditory evoked potentials. Neurobiol Dis 2009; 35:311-7. [PMID: 19467327 PMCID: PMC2726963 DOI: 10.1016/j.nbd.2009.05.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Revised: 04/27/2009] [Accepted: 05/17/2009] [Indexed: 11/29/2022] Open
Abstract
Ketamine is an NMDA receptor antagonist with a variety of uses, ranging from recreational drug to pediatric anesthetic and chronic pain reliever. Despite its value in the clinical setting, little is known about the immediate and long-lasting effects of repeated ketamine treatment. We assessed the effects of chronic administration of a subanesthetic dose of ketamine on contextual fear conditioning, detection of pitch deviants and auditory gating. After four, but not two, weeks of daily ketamine injections, mice exhibited decreased freezing in the fear conditioning paradigm. Gating of the P80 component of auditory evoked potentials was also significantly altered by treatment condition, as ketamine caused a significant decrease in S1 amplitude. Additionally, P20 latency was significantly increased as a result of ketamine treatment. Though no interactions were found involving test week, stimulus and treatment condition, these results suggest that repeated ketamine administration impairs fear memory and has lasting effects on encoding of sensory stimuli.
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669
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Ehrlichman RS, Luminais SN, White SL, Rudnick ND, Ma N, Dow HC, Kreibich AS, Abel T, Brodkin ES, Hahn CG, Siegel SJ. Neuregulin 1 transgenic mice display reduced mismatch negativity, contextual fear conditioning and social interactions. Brain Res 2009; 1294:116-27. [PMID: 19643092 DOI: 10.1016/j.brainres.2009.07.065] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2009] [Revised: 07/13/2009] [Accepted: 07/18/2009] [Indexed: 01/19/2023]
Abstract
INTRODUCTION Neuregulin-1 (NRG1) is one of susceptibility genes for schizophrenia and plays critical roles in glutamatergic, dopaminergic and GABAergic signaling. Using mutant mice heterozygous for Nrg1 (Nrg1(+/-)) we studied the effects of Nrg1 signaling on behavioral and electrophysiological measures relevant to schizophrenia. EXPERIMENTAL PROCEDURE Behavior of Nrg1(+/-) mice and their wild type littermates was evaluated using pre-pulse inhibition, contextual fear conditioning, novel object recognition, locomotor, and social choice paradigms. Event-related potentials (ERPs) were recorded to assess auditory gating and novel stimulus detection. RESULTS Gating of ERPs was unaffected in Nrg1(+/-) mice, but mismatch negativity in response to novel stimuli was attenuated. The Nrg1(+/-) mice exhibited behavioral deficits in contextual fear conditioning and social interactions, while locomotor activity, pre-pulse inhibition and novel object recognition were not impaired. SUMMARY Nrg1(+/-) mice had impairments in a subset of behavioral and electrophysiological tasks relevant to the negative/cognitive symptom domains of schizophrenia that are thought to be influenced by glutamatergic and dopaminergic neurotransmission. These mice are a valuable tool for studying endophenotypes of schizophrenia, but highlight that single genes cannot account for the complex pathophysiology of the disorder.
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Furlani D, Li W, Pittermann E, Klopsch C, Wang L, Knopp A, Jungebluth P, Thedinga E, Havenstein C, Westien I, Ugurlucan M, Li RK, Ma N, Steinhoff G. A transformed cell population derived from cultured mesenchymal stem cells has no functional effect after transplantation into the injured heart. Cell Transplant 2009; 18:319-31. [PMID: 19558780 DOI: 10.3727/096368909788534906] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Bone marrow-derived mesenchymal stem cells (MSCs) are multipotent cells characterized by their self-renewal and differentiation potential. Accumulating clinical and preclinical evidence indicate MSCs are a promising cell source for regenerative medical therapies. However, undesirable immortalization, spontaneous transformation, and tumorigenic potential from long-term cultured MSCs have been reported in human and mouse. We report rat MSCs isolated from young donors could undergo transformation in early passage culture. We aimed to characterize the transformed population and determine their therapeutic effects after intracardiac transplantation in the infarcted myocardium. MSCs were isolated from bone marrow of Lewis rats according to standard protocols and cultured under standard conditions. Phenotype of growing cells was assessed by flow cytometry. Following acute myocardial infarction in rats, cells were delivered by intracardiac injection. Cardiac functions were assessed by pressure-volume loops. Infarction size and pathologic effects were evaluated after 6 weeks. The abnormal colonies were detected in culture as early at passage 3. They were noted to appear as distinctly different morphology from typical MSCs, which changed from a normal elongated spindle shape to a compact abnormal morphology. They exhibited rapid cell proliferation. Some subclones lost contact inhibition of cell division and formed multilayer aggregates. Chromosomal instability was detected. They were devoid of surface markers CD29, CD44, CD90, and CD117. Furthermore, there was no significant improvement on infarction size and cardiac function 6 weeks after cell transplantation. Our study highlights the need for establishment of biosafety criteria in regulating culture- expanded MSCs to achieve the full clinical therapeutic benefits.
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671
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Klopsch C, Furlani D, Gäbel R, Li W, Pittermann E, Ugurlucan M, Kundt G, Zingler C, Titze U, Wang W, Ong LL, Wagner K, Li RK, Ma N, Steinhoff G. Intracardiac injection of erythropoietin induces stem cell recruitment and improves cardiac functions in a rat myocardial infarction model. J Cell Mol Med 2009; 13:664-79. [PMID: 19449462 PMCID: PMC3822874 DOI: 10.1111/j.1582-4934.2008.00546.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Erythropoietin (EPO) protects the myocardium from ischaemic injury and promotes beneficial remodelling. We assessed the therapeutic efficacy of intracardiac EPO injection and EPO-mediated stem cell homing in a rat myocardial infarction (MI) model. Following MI, EPO (3000 U/kg) or saline was delivered by intracardiac injection. Compared to myocardial infarction control group (MIC), EPO significantly improved left ventricular function (n =11-14, P < 0.05) and decreased right ventricular wall stress (n = 8, P < 0.05) assessed by pressure-volume loops after 6 weeks. MI-EPO hearts exhibited smaller infarction size (20.1 +/- 1.1% versus 27.8 +/- 1.2%; n = 6-8, P < 0.001) and greater capillary density (338.5 +/- 14.7 versus 259.8 +/- 9.2 vessels per mm2; n = 6-8, P < 0.001) than MIC hearts. Direct EPO injection reduced post-MI myocardial apoptosis by approximately 41% (0.27 +/- 0.03% versus 0.42 +/- 0.03%; n = 6, P= 0.005). The chemoattractant SDF-1 was up-regulated significantly assessed by quantitative realtime PCR and immunohistology. c-Kit(+) and CD34(+) stem cells were significantly more numerous in MI-EPO than in MIC at 24 hrs in peripheral blood (n = 7, P < 0.05) and 48 hrs in the infarcted hearts (n = 6, P < 0.001). Further, the mRNAs of Akt, eNOS and EPO receptor were significantly enhanced in MI-EPO hearts (n = 7, P < 0.05). Intracardiac EPO injection restores myocardial functions following MI, which may attribute to the improved early recruitment of c-Kit(+) and CD34(+) stem cells via the enhanced expression of chemoattractant SDF-1.
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672
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Ma N, Wen ZG, Li YH, Cui DJ. [A case report of pulmonary actinomycosis and review of the literature]. ZHONGHUA JIE HE HE HU XI ZA ZHI = ZHONGHUA JIEHE HE HUXI ZAZHI = CHINESE JOURNAL OF TUBERCULOSIS AND RESPIRATORY DISEASES 2009; 32:485-488. [PMID: 19953999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To improve the awareness of primary pulmonary actinomycosis. METHOD One case of primary endobronchial actinomycosis was reported and 187 cases of primary pulmonary actinomycosis reported in the literature were reviewed. RESULTS A 66-year-old female had had recurrent cough, sputum production and fever for 4 years. Chest X-ray showed pneumonia in the right middle lobe. The diagnosis of pulmonary actinomycosis was confirmed by histopathological examination. The incidence of bronchopulmonary actinomycosis was 2 times higher in males than in females. The common clinical presentations included cough, sputum and chest pain with a shadow or shadows on chest radiograph. The findings on CT included patchy air-space consolidation, multifocal nodular appearance, cavitation, pleural effusions or thickening and hilar and/or mediastinal lymphadenopathy. Accurate diagnosis was generally made by histopathological examination of transbronchoscopic biopsy or surgical samples. Penicillin, tetracycline, erythromycin, sulphanilamide, lincomycin and surgical resection remained to be the treatment of choice over the last 50 years. CONCLUSION Primary bronchopulmonary actinomycosis is a rare infectious disease. Early diagnosis and proper treatment can lead to good outcomes with a low mortality.
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Gäbel R, Klopsch C, Furlani D, Yerebakan C, Li W, Ugurlucan M, Ma N, Steinhoff G. Single high-dose intramyocardial administration of erythropoietin promotes early intracardiac proliferation, proves safety and restores cardiac performance after myocardial infarction in rats☆. Interact Cardiovasc Thorac Surg 2009; 9:20-5; discussion 25. [DOI: 10.1510/icvts.2008.191916] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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674
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Ma N, Abel T, Hernandez PJ. Exchange protein activated by cAMP enhances long-term memory formation independent of protein kinase A. Learn Mem 2009; 16:367-70. [PMID: 19470652 DOI: 10.1101/lm.1231009] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
It is well established that cAMP signaling within neurons plays a major role in the formation of long-term memories--signaling thought to proceed through protein kinase A (PKA). However, here we show that exchange protein activated by cAMP (Epac) is able to enhance the formation of long-term memory in the hippocampus and appears to do so independent of PKA, thus demonstrating the importance of Epac-mediated signaling in memory consolidation.
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675
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Furlani D, Ugurlucan M, Ong L, Bieback K, Pittermann E, Westien I, Wang W, Yerebakan C, Li W, Gaebel R, Li RK, Vollmar B, Steinhoff G, Ma N. Is the intravascular administration of mesenchymal stem cells safe? Microvasc Res 2009; 77:370-6. [DOI: 10.1016/j.mvr.2009.02.001] [Citation(s) in RCA: 210] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Accepted: 02/05/2009] [Indexed: 01/16/2023]
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676
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Yerebakan C, Sandica E, Prietz S, Klopsch C, Ugurlucan M, Kaminski A, Abdija S, Lorenzen B, Boltze J, Nitzsche B, Egger D, Barten M, Furlani D, Ma N, Vollmar B, Liebold A, Steinhoff G. Autologous umbilical cord blood mononuclear cell transplantation preserves right ventricular function in a novel model of chronic right ventricular volume overload. Cell Transplant 2009; 18:855-68. [PMID: 19500473 DOI: 10.3727/096368909x471170] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
We aimed to evaluate the feasibility and efficacy of autologous umbilical cord blood mononuclear cell (UCMNC) transplantation on right ventricular (RV) function in a novel model of chronic RV volume overload. Four-month-old sheep (n = 20) were randomized into cell (n = 10) and control groups (n = 10). After assessment of baseline RV function by the conductance catheter method, a transannular patch (TAP) was sutured to the right ventricular outflow tract (RVOT). Following infundibulotomy the ring of the pulmonary valve was transected without cardiopulmonary bypass. UCMNC implantation (8.22 +/- 6.28 x 10(7)) in the cell group and medium injection in the control group were performed into the RV myocardium around the TAP. UCMNCs were cultured for 2 weeks after fluorescence-activated cell sorting (FACS) analysis for CD34 antigen. Transthoracic echocardiography (TTE) and computed tomography were performed after 6 weeks and 3 months, respectively. RV function was assessed 3 months postoperatively before the hearts were excised for immunohistological examinations. FACS analysis revealed 1.2 +/- 0.22% CD34(+) cells within the isolated UCMNCs from which AcLDL(+) endothelial cells were cultured in vitro. All animals survived surgery. TTE revealed grade II-III pulmonary regurgitation in both groups. Pressure-volume loops under dobutamine stress showed significantly improved RV diastolic function in the cell group (dP/dt(min): p = 0.043; E(ed): p = 0.009). CD31 staining indicated a significantly enhanced number of microvessels in the region of UCMNC implantation in the cell group (p < 0.001). No adverse tissue changes were observed. TAP augmentation and pulmonary annulus distortion without cardiopulmonary bypass constitutes a valid large animal model mimicking the surgical repair of tetralogy of Fallot. Our results indicate that the chronically volume-overloaded RV profits from autologous UCMNC implantation by enhanced diastolic properties with a probable underlying mechanism of increased angiogenesis.
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677
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Guan J, Ma N. Structural equation model with PLS path modeling for an integrated system of publicly funded basic research. Scientometrics 2009. [DOI: 10.1007/s11192-009-2058-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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678
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Ugurlucan M, Yerebakan C, Furlani D, Ma N, Steinhoff G. Cell sources for cardiovascular tissue regeneration and engineering. Thorac Cardiovasc Surg 2009; 57:63-73. [PMID: 19241306 DOI: 10.1055/s-2008-1039235] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The heart has long been regarded as a post-mitotic organ. Since many years, physicians have focused on developing strategies to restore the myocardium after ischemic damage followed by ventricular dysfunction. Restoration is generally achieved through the redirection of blood flow or by supporting contractile performance. The discovery of stem cells capable of generating angiogenic or contractile cells and structures offers new horizons to patients suffering from myocardial disease. Experimental studies indicate that the delivery or mobilization of stem and progenitor cells may improve tissue perfusion and the contractile performance of the damaged heart. Another aspect of restoration is based on cardiovascular tissue engineering and the creation of three-dimensional biological conformations to replace the artificial materials frequently used during operations, i.e., valves and grafts, or even a portion of the nonfunctional myocardial tissue. At present, the underlying intra- and intercellular molecular mechanisms controlling myocardiogenesis and cardiomyocyte replacement during regenerative processes are not very well understood. In this brief review we try to give the answers to questions on certain aspects of myocardial tissue regeneration and engineering procedures.
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679
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Ma N, Sargent EH, Kelley SO. One-step DNA-programmed growth of luminescent and biofunctionalized nanocrystals. NATURE NANOTECHNOLOGY 2009; 4:121-5. [PMID: 19197315 PMCID: PMC2667941 DOI: 10.1038/nnano.2008.373] [Citation(s) in RCA: 154] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Accepted: 11/18/2008] [Indexed: 05/22/2023]
Abstract
Colloidal semiconductor nanocrystals are widely used as lumiphores in biological imaging because their luminescence is both strong and stable, and because they can be biofunctionalized. During synthesis, nanocrystals are typically passivated with hydrophobic organic ligands, so it is then necessary either to replace these ligands or encapsulate the nanocrystals with hydrophilic moieties to make the lumiphores soluble in water. Finally, biological labels must be added to allow the detection of nucleic acids, proteins and specific cell types. This multistep process is time- and labour-intensive and thus out of reach of many researchers who want to use luminescent nanocrystals as customized lumiphores. Here, we show that a single designer ligand--a chimeric DNA molecule--can controllably program both the growth and the biofunctionalization of the nanocrystals. One part of the DNA sequence controls the nanocrystal passivation and serves as a ligand, while another part controls the biorecognition. The synthetic protocol reported here is straightforward and produces a homogeneous dispersion of nanocrystal lumiphores functionalized with a single biomolecular receptor. The nanocrystals exhibit strong optical emission in the visible region, minimal toxicity and have hydrodynamic diameters of approximately 6 nm, which makes them suitable for bioimaging. We show that the nanocrystals can specifically bind DNA, proteins or cells that have unique surface recognition markers.
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680
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Li Y, Wu Z, Ma N, Gao J. Regulation of the rose Rh-PIP2;1 promoter by hormones and abiotic stresses in Arabidopsis. PLANT CELL REPORTS 2009; 28:185-196. [PMID: 18985353 DOI: 10.1007/s00299-008-0629-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2008] [Revised: 09/21/2008] [Accepted: 10/12/2008] [Indexed: 05/27/2023]
Abstract
Our previous work has indicated that an ethylene-responsive aquaporin gene, Rh-PIP2;1, played an important role in the epidermal cell expansion of rose petals. In this work, we isolated an 896 bp promoter sequence of the Rh-PIP2;1 and found that the promoter was rare in plants, occurring with an Inr motif, but without a TATA box. In transgenic Arabidopsis harboring the Rh-PIP2;1 promoter::GUS construct, the activity of Rh-PIP2;1 promoter was found to be developmental-dependent in almost all of the tested organs, and was particularly active in organs that were rapidly expanding, and in tissues with high water flux capacity. Moreover, the promoter activity was inhibited by ACC, ABA, NaCl, and cold in the roots of 3 or 6-day-old plants, and was increased by GA(3) and mannitol in the rosettes of 9 or 12-day-old plants. Deleting the fragment from -886 to -828 resulted in nearly complete disappearance of the promoter activity in roots, and a substantial decrease in the leaves, hypocotyls and floral organs. Taken together, our results indicated that the Rh-PIP2;1 promoter responded to hormones and abiotic stresses in a developmental- and spatial-dependent manner, and the -886 to -828 region was crucial for the activity of the Rh-PIP2;1 promoter.
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MESH Headings
- Abscisic Acid/pharmacology
- Amino Acids, Cyclic/pharmacology
- Arabidopsis/drug effects
- Arabidopsis/genetics
- Base Sequence
- Gene Expression Regulation, Plant/drug effects
- Gene Expression Regulation, Plant/genetics
- Genes, Plant/drug effects
- Genes, Plant/genetics
- Genes, Plant/immunology
- Hormones/pharmacology
- Molecular Sequence Data
- Plants, Genetically Modified/drug effects
- Plants, Genetically Modified/genetics
- Promoter Regions, Genetic/drug effects
- Promoter Regions, Genetic/genetics
- Rosa/genetics
- Sodium Chloride/pharmacology
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681
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Wang W, Li W, Furlani D, Lützow K, Lendlein A, Liebold A, Ma N, Steinhoff G. Localized SDF-1 gene release mediated by collagen substrate induces CD117+ stem cells homing. Thorac Cardiovasc Surg 2009. [DOI: 10.1055/s-0029-1191716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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682
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Gäbel R, Klopsch C, Furlani D, Kaminski A, Li W, Alozie A, Liebold A, Lendlein A, Ma N, Steinhoff G. Erythropoietin induces cell proliferation, early angiogenesis and attenuates cardiac remodeling after myocardial infarction. Thorac Cardiovasc Surg 2009. [DOI: 10.1055/s-0029-1191704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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683
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Wang W, Li W, Ong LL, Furlani D, Kaminski A, Liebold A, Lützow K, Lendlein A, Wang J, Li RK, Steinhoff G, Ma N. Localized SDF-1alpha gene release mediated by collagen substrate induces CD117 stem cells homing. J Cell Mol Med 2008; 14:392-402. [PMID: 19413887 PMCID: PMC3837586 DOI: 10.1111/j.1582-4934.2008.00624.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Stromal cell-derived factor-1α (SDF-1α) mediated mobilization and homing of stem cells showed promising potential in stem cell based tissue engineering and regenerative medicine. However local and sustained release of SDF-1α is indispensable for stem cell mediated regenerative process due to its short half-life under inflammatory conditions. In this study, a gene activated collagen substrate (GAC) was formed via assembly of plasmid encoding SDF-1α into a collagen substrate to create a microenvironment favoring stem cell homing. Local release of SDF-1α from the transfected cells on GAC and its effect on CD117+ stem cell homing were investigated. Non-viral poly-ethyleneimine (25kDa PEI)/DNA complexes were mixed with rat tail collagen solution to form the GAC. Optimization of GAC was carried out based on collagen effects on the PEI/DNA complexes, viability and luciferase expression of COS7 cells on GAC. CD117+ stem cells homing in response to SDF-1α local expression from transfected cells on GAC were investigated in a flow chamber in vitro and in a mouse hind limb model in vivo. The gene expression, migration of CD117+ stem cells and the induced inflammation were investigated with immunostaining, reverse transcription polymerase chain reaction (RT-PCR) and H&E staining. The optimized parameters for GAC were DNA dosage 10 μg/cm2, molar ratio of PEI nitrogen in primary amine to DNA phosphate (N/P ratio) 4 and mass ratio of collagen to DNA (C/D ratio) 1.0. It kept cell viability above 75% and transfection efficiency around 5.8 × 105 RLU/mg protein. GAC allowed the sustained gene release up to 60 days. GAC mediated SDF-1α gene release induced migration and homing of CD117+ stem cells in vitro and in vivo significantly, and the inflammation of GAC reduced significantly two weeks after transplantation. GAC is a promising stem cell based therapeutic strategy for regenerative medicine.
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684
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Ma N, Zhong H, Ye C, Shan G, Zhang F, Mei J. Minimally invasive thoracoscope-assisted Heller myotomy for achalasia. Asian Cardiovasc Thorac Ann 2008; 16:459-62. [PMID: 18984754 DOI: 10.1177/021849230801600606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Forty-five patients (20 men and 25 women) with a median age of 46.5 years, who were diagnosed with esophageal achalasia by clinical history, esophagoscopy, and barium esophagogram, underwent thoracoscope-assisted Heller myotomy with a minimal incision. Esophageal pressure and pH were monitored. Two patients were excluded because of mucosal perforation during the operation, requiring conversion to an open procedure. There was no postoperative esophageal leakage or hospital death. All patients resumed a normal diet as soon as gastrointestinal function recovered, and their symptoms disappeared completely. The mean operative time was 1.2 hours (range, 0.5-3.8 hours). After 2.1 years of follow-up, the outcome was rated excellent in 33 (77%) patients, good in 7 (16%), and fair in 3 (7%). Esophageal dilation was required in 3 patients because of relapsing dysphagia within 3 months after the operation. Four (9%) patients had some regurgitation but no further surgical or medical treatment was needed. Esophageal pressure and pH correlated with the clinical manifestations. Our modified Heller myotomy with the assistance of thoracoscopy is effective for achalasia.
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685
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Wang QS, Luo BJ, Ma N. [A case of pulmonary embolism with thrombus straddling between two atria diagnosed by echocardiography]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 2008; 36:1042. [PMID: 19102922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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686
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Tsampoula X, Taguchi K, Cizmár T, Garces-Chavez V, Ma N, Mohanty S, Mohanty K, Gunn-Moore F, Dholakia K. Fibre based cellular transfection. OPTICS EXPRESS 2008; 16:17007-13. [PMID: 18852810 DOI: 10.1364/oe.16.017007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Optically assisted transfection is emerging as a powerful and versatile method for the delivery of foreign therapeutic agents to cells at will. In particular the use of ultrashort pulse lasers has proved an important route to transiently permeating the cell membrane through a multiphoton process. Though optical transfection has been gaining wider usage to date, all incarnations of this technique have employed free space light beams. In this paper we demonstrate the first system to use fibre delivery for the optical transfection of cells. We engineer a standard optical fibre to generate an axicon tip with an enhanced intensity of the remote output field that delivers ultrashort (~ 800 fs) pulses without requiring the fibre to be placed in very close proximity to the cell sample. A theoretical model is also developed in order to predict the light propagation from axicon tipped and bare fibres, in both air and water environments. The model proves to be in good agreement with the experimental findings and can be used to establish the optimum fibre parameters for successful cellular transfection. We readily obtain efficiencies of up to 57 % which are comparable with free space transfection. This advance paves the way for optical transfection of tissue samples and endoscopic embodiments of this technique.
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687
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Li W, Ma N, Ong LL, Kaminski A, Skrabal C, Ugurlucan M, Lorenz P, Gatzen HH, Lützow K, Lendlein A, Pützer BM, Li RK, Steinhoff G. Enhanced thoracic gene delivery by magnetic nanobead-mediated vector. J Gene Med 2008; 10:897-909. [PMID: 18481827 DOI: 10.1002/jgm.1208] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND Systemic gene delivery is limited by the adverse hydrodynamic conditions on the collection of gene carrier particles to the specific area. In the present study, a magnetic field was employed to guide magnetic nanobead (MNB)/polymer/DNA complexes after systemic administration to the left side of the mouse thorax in order to induce localized gene expression. METHODS Nonviral polymer (poly ethyleneimine, PEI) vector-gene complexes were conjugated to MNBs with the Sulfo-NHS-LC-Biotin linker. In vitro transfection efficacy of MNB/PEI/DNA was compared with PEI/DNA in three different cell lines as well as primary endothelial cells under magnetic field stimulation. In vivo, MNB/PEI/DNA complexes were injected into the tail vein of mice and an epicardial magnet was employed to attract the circulating MNB/PEI/DNA complexes. RESULTS Endocytotic uptake of MNB/PEI/DNA complexes and intracellular gene release with nuclear translocation were observed in vitro, whereas the residues of MNB/PEI complexes were localized at the perinuclear region. Compared with PEI/DNA complexes alone, MNB/PEI/DNA complexes had a 36- to 85-fold higher transfection efficiency under the magnetic field. In vivo, the epicardial magnet effectively attracted MNB/PEI/DNA complexes in the left side of the thorax, resulting in strong reporter and therapeutic gene expression in the left lung and the heart. Gene expression in the heart was mainly within the endothelium. CONCLUSIONS MNB-mediated gene delivery could comprise a promising method for gene delivery to the lung and the heart.
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688
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Nesselmann C, Ma N, Bieback K, Wagner W, Ho A, Konttinen YT, Zhang H, Hinescu ME, Steinhoff G. Mesenchymal stem cells and cardiac repair. J Cell Mol Med 2008; 12:1795-810. [PMID: 18684237 PMCID: PMC4506151 DOI: 10.1111/j.1582-4934.2008.00457.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Accepted: 08/01/2008] [Indexed: 12/20/2022] Open
Abstract
Accumulating clinical and experimental evidence indicates that mesenchymal stem cells (MSCs) are promising cell types in the treatment of cardiac dysfunction. They may trigger production of reparative growth factors, replace damaged cells and create an environment that favours endogenous cardiac repair. However, identifying mechanisms which regulate the role of MSCs in cardiac repair is still at work. To achieve the maximal clinical benefits, ex vivo manipulation can further enhance MSC therapeutic potential. This review focuses on the mechanism of MSCs in cardiac repair, with emphasis on ex vivo manipulation.
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689
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Ma N, Xue J, Li Y, Liu X, Dai F, Jia W, Luo Y, Gao J. Rh-PIP2;1, a rose aquaporin gene, is involved in ethylene-regulated petal expansion. PLANT PHYSIOLOGY 2008; 148:894-907. [PMID: 18715962 PMCID: PMC2556823 DOI: 10.1104/pp.108.120154] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2008] [Accepted: 08/10/2008] [Indexed: 05/18/2023]
Abstract
Aquaporins are water channel proteins that facilitate the passage of water through biological membranes and play a crucial role in plant growth. We showed that ethylene treatment significantly reduced petal size, inhibited expansion of petal abaxial subepidermal cells, and decreased petal water content in rose (Rosa hybrida 'Samantha'). Here, we report the isolation of a plasma membrane aquaporin (PIP) gene, Rh-PIP2;1, and characterized its potential role in ethylene-inhibited petal expansion. Rh-PIP2;1 is mainly localized on the plasma membrane and belongs to the class 2 subfamily of PIP proteins. We show that Rh-PIP2;1 is an active water channel. The transcripts of Rh-PIP2;1 are highly abundant in petal epidermal cells, especially in the abaxial subepidermal cells. The expression of Rh-PIP2;1 is highly correlated with petal expansion and tightly down-regulated by ethylene. Furthermore, we demonstrate that in Rh-PIP2;1-silenced flowers, petal expansion was greatly inhibited and anatomical features of the petals were similar to those of ethylene-treated flowers. We argue that Rh-PIP2;1 plays an important role in petal cell expansion and that ethylene inhibits petal expansion of roses at least partially by suppressing Rh-PIP2;1 expression.
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690
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Ma N, Lu L, Ma L, Zhang J, Zhang Z. [Experimental study on peripheral nerve plasticity in rats]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2008; 22:1073-1076. [PMID: 18822731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
OBJECTIVE To observe the plastic changes of sensory nerve in terms of structure and function when target organ changed through making the rat model of nerve regeneration by anastomosing the proximal end of sensory nerve and the distal end of motor nerve. METHODS Thirty adult SD rats (male or female), weighing 200-250 g, were randomized into three groups (n=10 per group). The left upper limb of the each rat was used as the experimental side, while the right upper limb as the control side. In group A, the medial antebrachial cutaneous nerve was cut 5 mm away from its origin and its proximal end was anastomosed end-to-end to the distal end of musculocutaneous nerve. In group B, the musculocutaneous nerve was cut 5 mm away from its nerve entry point and the proximal end of medial antebrachial cutaneous nerve were anastomosed end-to-end to the distal end of musculocutaneous nerve. In group C, medial antebrachial cutaneous nerve and musculocutaneous nerve were cut, without further anastomosis. Twenty-four weeks after operation, the general condition and the motion of the elbow joint of rats, the wet weight and muscle fiber cross-section area of the biceps brachii as well as the latent period and the amplitude of the evoked potential were observed and the acetylcholinesterase (AchE) staining of nerve of proximal end of anastomosis was conducted. RESULTS All the rats survived for 24 weeks with good general condition and without wound infection. The rats in groups A, B and C were lost the active flexion of left elbow joint after operation. The rats in groups A and B got recovered to some degree at 24 weeks. The behavioral evaluation showed that there were 7 limbs in group A and 5 limbs in group B scored as 4-5 points, there was a significant difference when compared with group C (P < 0.05), but there was no significant difference between group A and group B (P > 0.05). Group A and group B were superior to group C in terms of the wet weight and the muscle fiber cross-section area of the biceps brachii (P < 0.05), but no significant difference between group A and group B was detected (P > 0.05). The evoked potential of the biceps brachii and motor nerve fibers in proximal end of anastomosis could be detected in both group A and group B. But there was no significant difference between group A and group B with respects of function recovery of elbow joint, the latent period and the amplitude of the evoked potential of the biceps brachii and the quantity of motor nerve fiber in proximal end of anastomosis (P > 0.05). CONCLUSION The change of target organ leads to the sensory nerve plasticity structurally and functionally, which may provide a new approach for peripheral nerve repair.
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691
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Fujita N, Sugimoto R, Ma N, Tanaka H, Iwasa M, Kobayashi Y, Kawanishi S, Watanabe S, Kaito M, Takei Y. Comparison of hepatic oxidative DNA damage in patients with chronic hepatitis B and C. J Viral Hepat 2008; 15:498-507. [PMID: 18331251 DOI: 10.1111/j.1365-2893.2008.00972.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
8-Hydroxydeoxyguanosine (8-OHdG) is a promutagenic DNA lesion produced by hydroxyl radicals and is recognized as a useful marker in estimating DNA damage induced by oxidative stress. The aim of this study was to clarify the clinical significance of hepatic 8-OHdG levels in patients with chronic viral hepatitis. Hepatic 8-OHdG accumulation was investigated in patients with chronic hepatitis C (CH-C) (n = 77) and chronic hepatitis B (CH-B) (n = 34) by immunohistochemical staining of liver biopsy samples. 8-OHdG positive hepatocytes were significantly higher in patients with CH-C compared to CH-B (median 55.0 vs 18.8 cells/10(5) mum(2), P < 0.0001). The number of positive hepatocytes significantly increased with the elevation of serum aminotransferase levels, especially in CH-C patients (8-OHdG vs alanine aminotransferase (ALT)/aspartate aminotrasferase (AST) were r = 0.738/0.720 in CH-C and 0.506/0.515 in CH-B). 8-OHdG reactivity was strongly correlated with body and hepatic iron storage markers in CH-C (vs serum ferritin, r = 0.615; vs hepatic total iron score, r = 0.520; vs hepatic hepcidin mRNA levels, r = 0.571), although it was related to serum HBV-DNA titers (r = 0.540) and age of patients (r = -0.559) in CH-B. These results indicate that hepatic oxidative DNA damage is common in chronic viral hepatitis, in particular chronic HCV-infected patients, suggesting a possible link between chronic hepatic inflammation and hepatocarcinogenesis. The strong positive correlation between hepatic DNA damage and iron overload suggests that iron content is one of the most likely mediators of hepatic oxidative stress and iron reduction may be beneficial to reduce the incidence of hepatic cancer in CH-C patients.
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692
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Lu LL, Lu XY, Ma N. Kinetics of non-catalyzed hydrolysis of tannin in high temperature liquid water. J Zhejiang Univ Sci B 2008; 9:401-6. [PMID: 18500780 DOI: 10.1631/jzus.b0730098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
High temperature liquid water (HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions, especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin and tara tannin in HTLW for the simultaneous preparation of gallic acid (GA) and pyrogallol (PY) are under investigation in our laboratory. In this study, the hydrolysis kinetics of gallotannin and tara tannin were determined. The reaction is indicated to be a typical consecutive first-order one in which GA has formed as a main intermediate and PY as the final product. Selective decomposition of tannin in HTLW was proved to be possible by adjusting reaction temperature and time. The present results provide an important basic data and reference for the green preparation of GA and PY.
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693
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Furlani D, Klopsch C, Gäbel R, Ugurlucan M, Pittermann E, Klee D, Wagner K, Li W, Wang W, Ong L, Nizze H, Titze U, Lützow K, Lendlein A, Steinhoff G, Ma N. Intracardiac Erythropoietin Injection Reveals Antiinflammatory Potential and Improved Cardiac Functions Detected by Forced Swim Test. Transplant Proc 2008; 40:962-6. [DOI: 10.1016/j.transproceed.2008.03.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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694
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Han XW, Wu G, Li YD, Zhang QX, Guan S, Ma N, Ma J. Overcoming the Delivery Limitation: Results of an Approach to Implanting an Integrated Self-expanding Y-shaped Metallic Stent in the Carina. J Vasc Interv Radiol 2008; 19:742-7. [DOI: 10.1016/j.jvir.2008.01.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2007] [Revised: 01/22/2008] [Accepted: 01/22/2008] [Indexed: 12/17/2022] Open
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695
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696
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Wang H, Zhu Z, Xiao Y, Ma N, Li H, Wen Z. [The value of serum tumor marker CA125 and CEA in the diagonosis of non-small cell lung cancer.]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 2008; 11:97-100. [PMID: 20727275 DOI: 10.3779/j.issn.1009-3419.2008.01.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Tumor marker cancer antigen 125(CA125) and carcinoembryonic antigen (CEA) all are the tumor markers found early. It was reported that the positive rate of CEA was highly in adenocarcinoma, after being analyzed all the case reports of non-small cell lung cancer (NSCLC) in recent 3 years, it was found that positive rate of CA125 was much higher in NSCLC than that of literatures. So, it's necessary to evaluate the value of serum CA125 and CEA measurement for NSCLC. METHODS The level of CA125 and CEA were detected with chemiluminescence in 136 NSCLC patients, 42 patients with respiratory diseases and 50 cases of normal control. RESULTS The levels of serum CA125 in NSCLC patients were significantly higher than that of patients with respiratory diseases and normal control (except mixed cell lung cancer) (P<0.0001). The levels of serum CEA in adenocarcinoma and squamous patients were significantly higher than that of patients with respiratory diseases and normal control(P<0.0001). No difference between patients with respiratory diseases and normal control. The positive rates of CA125 were 92.3% in large-cell lung cancers, 80.2% in adenocarcinoma, 54.8% in squamous cancer, 50% in mixed cell lung cancer, respectively. The positive rates of CEA were 67.4% in large-cell lung cancers, 25.8% in squamous cancer, 0 in adenocarcinoma and mixed cell lung cancer, respectively. Combined measurement of CA125 and CEA positive rates was higher only in adenocarcinoma. The positive rates of CA125 and CEA were 86.9%and 63.6% in advanced NSCLC, respectively. The positive rates of CA125 were 90.9% in advanced adenocarcinoma. CONCLUSIONS The positive rates of CA125 is higher than that of CEA in NSCLC patients, especially in large-cell lung cancers and advanced adenocarcinoma. CA125 is more useful than CEA in diagnosis of NSCLC.
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697
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Ma N, Sargent EH, Kelley SO. Biotemplated nanostructures: directed assembly of electronic and optical materials using nanoscale complementarity. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b711764g] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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698
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Faria EC, Ma N, Gazi E, Gardner P, Brown M, Clarke NW, Snook RD. Measurement of elastic properties of prostate cancer cells using AFM. Analyst 2008; 133:1498-500. [DOI: 10.1039/b803355b] [Citation(s) in RCA: 204] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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699
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Furlani D, Klopsch C, Gäbel R, Wagner K, Li W, Ong L, Ugurlucan M, Liebold A, Ma N, Steinhoff G. Erythropoietin enhances post-infarction ventricular functions after local intramyocardial delivery. Thorac Cardiovasc Surg 2008. [DOI: 10.1055/s-2008-1037919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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700
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Ma N, Liu WL, Le HD, Jiang XY, Liu W, Liu X, Deng CF, Zhang BK, Xiang DX. High-performance liquid chromatographic analysis of resveratrol analog 3,5,4'- trimethoxystilbene in rat plasma. ACTA ACUST UNITED AC 2008; 30:215-20. [DOI: 10.1358/mf.2008.30.3.1139052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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