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Xu Y, Zhu KJ, Zhu N, Jiang DH, Chen XZ, Cheng H. Expression of Foxp3+CD4+CD25+ regulatory T cells and Th1/Th2, Tc1/Tc2 profiles in the peripheral blood of patients with condyloma acuminatum. Clin Exp Dermatol 2008; 34:229-35. [PMID: 19077104 DOI: 10.1111/j.1365-2230.2008.03001.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Condyloma acuminatum (CA) is a disease that appears as proliferative lesions of the genital epithelium caused by human papillomavirus (HPV) infection. The balance between type 1 and type 2 T-cell subsets in patients with CA is thought to modulate antiviral immunity. CD4+CD25+ regulatory T cells (Tregs) inhibit proliferation and cytokine production by both T-helper (Th)1 and Th2 cells and reversibly suppress CTL-mediated immunity. A better understanding of the mechanisms of T-cell regulation in CA might help in developing more effective therapeutic strategies. Objective. To evaluate the balance of Th1/Th2 and Tc1/Tc2 and to assess their correlation with changes in number of Tregs in CA. METHODS The percentage of Th1, Th2, Tc1, Tc2 and Tregs were detected by flow cytometry after intracellular staining for cytokines (interferon-gamma and interleukin-4) and Foxp3 of T lymphocytes in the peripheral blood of 30 patients and 20 healthy volunteers. RESULTS Patients with CA showed a decreased proportion of Th1 and Tc1 cells and a decreased ratio of Th1/Th2 and Tc1/Tc2. In particular, strikingly decreased ratios of Th1/Th2 were found in 15 patients with relapsed CA (P < 0.01). The mean +/- SD number of Foxp3+CD4+CD25+ Tregs increased significantly in patients with CA (3.37 +/- 1.03%) and patients with relapsed CA (4.68 +/- 1.17%) compared with healthy controls (1.18 +/- 0.53%) (P < 0.001). CONCLUSION Tregs appear to downregulate cytokine expression in both Tc1 and Th1 subsets of effector T cells, which may be responsible for antivirus responses.
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Shen SQ, Li K, Zhu N, Nakao A. Expression and clinical significance of NET-1 and PCNA in hepatocellular carcinoma. Med Oncol 2008; 25:341-5. [PMID: 18214716 DOI: 10.1007/s12032-008-9042-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Accepted: 12/27/2007] [Indexed: 01/10/2023]
Abstract
OBJECTIVE Objective of this study was to detect the expression of neuroepithelial transforming gene-1 (NET-1) and proliferating cell nuclear antigen (PCNA) in hepatocellular carcinoma (HCC) and adjacent tissues, and to investigate the relation of the expression of NET-1 in HCC tissue with cancer proliferation, metastasis and clinic stages. METHODS The expression of NET-1 mRNA was detected by reverse transcription-polymerase chain reaction method in 34 human HCC tissues, and it was matched with 34 paracarcinoma tissues. The expression of PCNA in HCC was analyzed by immunohistochemistry. Meanwhile, the relation of the expression with clinic pathological features of HCC was evaluated, and the correlation between the expression of NET-1 and PCNA in HCC was investigated. RESULTS Expression of NET-1 was significantly higher in HCC than that in matched paracarcinoma tissues. The expression of NET-1 was significantly higher in TMN III-IV HCC tissues when compared with TMN I-II HCC tissues (P<0.05). The expression level of NET-1 in HCC tissues was related to intrahepatic metastasis and portal vein infiltration. The expression of NET-1 in HCC tissues was positively correlated with PCNA. CONCLUSIONS The expression of NET-1 may relate to proliferation, metastasis and clinic stages of HCC. The expression of NET-1 in HCC tissues may positively correlate to the TMN stages.
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128
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Guo Y, Zhu N, Zhu S, Deng C. Molecular phylogenetic diversity of bacteria and its spatial distribution in composts. J Appl Microbiol 2007; 103:1344-54. [PMID: 17897238 DOI: 10.1111/j.1365-2672.2007.03367.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To investigate microbial diversity of swine manure composts in the initial stage and the spatial distribution due to gradient effect. METHODS AND RESULTS Samples in different locations of a composting pile were taken and analysed by using a culture-independent approach. Total community DNA was extracted and bacterial 16S rRNA genes were subsequently amplified, cloned, restriction fragment length polymorphism-screened and sequenced. Thirty-three unique sequence types were found among the 110 analysed positive clones from superstratum sample; 56 among 122 from middle-level sample and 32 among 114 from substrate sample, respectively. The sequences related to Clostridium sp. were most common in the composts. One hundred and thirteen out of 121 16S rDNA sequence types displayed homology with those in the GenBank database. Seven 16S rDNA sequence types were not closely related to any known species. The middle-level sample had the highest microbial diversity, containing unique sequences related to Lactosphaera pasteurii, Firmicutes sp., Aerococcus sp., Megasphaera sp. and Stenotrophomonas sp. CONCLUSIONS Pile temperature significantly affected microbial community in the initial stage of the composting. Microbial community in different locations is quite different resulting from gradient effect. SIGNIFICANCE AND IMPACT OF THE STUDY Results of this study reveal high bacterial diversity in manure composts, and provide molecular evidence to support gradient effect on microbial diversity in initial stage as well.
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129
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Zhu N, Cui FZ, Hu K, Zhu L. Biomedical modification of poly(L-lactide) by blending with lecithin. J Biomed Mater Res A 2007; 82:455-61. [PMID: 17295251 DOI: 10.1002/jbm.a.31159] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Lecithin was, for the first time, blended with PLLA to prepare scaffold material for tissue engineering applications in the present study. Solution blending was used to incorporate Lecithin (containing 0-10 wt %) with PLLA to enhance the blend films biocompatibility, hydrophilicity and toughness while maintaining mechanical strength of PLLA. The results of FTIR-ATR analysis indicated that the amino groups of lecitin existed in the films. DSC analysis indicated that T(g) decreased with the increase of lecithin content in the blend films. The percentage elongation markedly increased with increase of lecithin content. The proliferation and viability of the vascular smooth muscle cell cultures on PLLA/Lecithin (containing 3-7 wt %) films were significantly enhanced compared to pure PLLA on tissue culture plates.
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Gu L, Findley HW, Zhu N, Zhou M. Endogenous TNFα mediates cell survival and chemotherapy resistance by activating the PI3K/Akt pathway in acute lymphoblastic leukemia cells. Leukemia 2006; 20:900-4. [PMID: 16511511 DOI: 10.1038/sj.leu.2404160] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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131
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Londhe VA, Li X, Nguyen HT, Li C, Zhu N, Li M, Minoo P. 165 ROLE OF INHIBITOR OF DIFFERENTIATION 2 (ID2) DURING MOUSE LUNG EMBRYOGENESIS. J Investig Med 2006. [DOI: 10.2310/6650.2005.x0004.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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132
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Londhe V, Li X, Nguyen H, Li C, Zhu N, Li M, Minoo P. Role of Inhibitor of Differentiation 2 (Id2) during Mouse Lung Embryogenesis. J Investig Med 2006. [DOI: 10.1177/108155890605401s49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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133
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Cai C, Xu F, Liu J, Zhu N, Cai W. Cultivation of aerobic granules in a sequential batch shaking reactor. ENVIRONMENTAL TECHNOLOGY 2004; 25:937-944. [PMID: 15366561 DOI: 10.1080/09593330.2004.9619387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Aerobic granular sludge is a promising biotechnology for wastewater treatment system. In this report, aerobic granular sludge was successfully cultivated in a sequential batch shaking reactor in which horizontal circular flow could be formed by shaking. In this way, granulation and aeration could be simultaneously achieved. In comparison with sequential batch airlift reactor, more homogeneous circular flow was formed in the sequential batch shaking reactor. The aerobic granules obtained in the reactor were smooth, 1.2 mm in average diameter, and had a settling velocity of 50-52 m h(-1). In addition, an increase in the hydrophobicity of the cell surface of granules indicated that granulation could be related to the change in cell hydrophobicity. Finally, microbial observation showed that rod-shape and coccoid bacteria were the dominant species in mature granules. Results of this study have important implications on the mechanism of the granulation process and further practical application.
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Pan HM, Zhu N, Lou F, Guo Y, Jin W, Lou HZ, Zheng Y. A phase II study of oxaliplatin with ELF regimen in patients with advanced gastric cancer. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.4206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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135
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Zhu N, Lalla R, Eves P, Brown TLH, King A, Kemp EH, Haycock JW, MacNeil S. Melanoma cell migration is upregulated by tumour necrosis factor-alpha and suppressed by alpha-melanocyte-stimulating hormone. Br J Cancer 2004; 90:1457-63. [PMID: 15054471 PMCID: PMC2409669 DOI: 10.1038/sj.bjc.6601698] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
We reported recently that the inflammatory cytokine tumour necrosis factor α (TNF-α) can upregulate integrin expression, cell attachment and invasion of cells through fibronectin in a human melanoma cell line (HBL). Furthermore, the actions of TNF-α were suppressed by the addition of an anti-inflammatory peptide α-melanocyte-stimulating hormone (α-MSH). In the current study, we extend this work investigating to what extent TNF-α might stimulate melanoma invasion by promoting cell migration and whether α-MSH is also inhibitory. Two human melanoma cell lines were examined in vitro (HBL and C8161) using a scratch migration assay. Analysis using either time-lapse video microscopy or imaging software analysis of migrating ‘fronts’ of cells revealed that C8161 cells migrated more rapidly than HBL cells. However, when cells were stimulated with TNF-α both cell types responded with a significant increase in migration distance over a 16–26 h incubation time. α-Melanocyte-stimulating hormone had an inhibitory effect on TNF-α-stimulated migration for HBL cells, completely blocking migration at 10−9 M. In contrast, C8161 cells did not respond to α-MSH (as these cells have a loss-of-function melanocortin-1 receptor). However, stable transfection of C8161 cells with the wild-type melanocortin-1 receptor produced cells whose migration was significantly inhibited by α-MSH. In addition, the use of a neutralising antibody to the β1-integrin subunit significantly reduced migration in both cell types. This data therefore supports an inflammatory environment promoting melanoma cell migration, and in addition shows that α-MSH can inhibit inflammatory stimulated migration. The data also support a fundamental role of the β1-integrin receptor in melanoma cell migration.
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Katerinaki E, Zhu N, Lalla R, Eves P, Haycock J, Evans G, Ghanem G, Lorigan P, Brown T, MacNeil S. PP-16 Does a wound healing environment and the inflammation associated with it promote melanoma invasion? ACTA ACUST UNITED AC 2003. [DOI: 10.1034/j.1600-0749.2003.08381.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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137
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Zhu N. A review of the historical relationship between migration and marriage. CHINESE JOURNAL OF POPULATION SCIENCE 2002; 3:327-39. [PMID: 12343858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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138
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Gu S, Zhu N. Regional differences and development models in China's urbanization. CHINESE JOURNAL OF POPULATION SCIENCE 2002; 5:251-66. [PMID: 12345591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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139
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Lou R, Mei PC, Gong JY, Zhu N, Kou ZH, Wu GY, Shen Y. [Fragile X mental retardation protein interacts with human NDK/Nm23-H2]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 2001; 23:580-4. [PMID: 12901102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
OBJECTIVE To investigate the physiological role of fragile X mental retardation protein (FMRP) and screen the proteins interacting with FMRP in human fetal hippocampus cDNA library. METHODS Human fetal hippocampus cDNA library was constructed in yeast two-hybrid DAD vector pGAD10. Quality of the library was measured by picking up random colonies as templates for PCR testing. Proteins interacting with FMRP were screened by yeast two-hybrid system. Furthermore, the interaction site of FMRP was mapped in yeast. RESULTS The average length of inserts of the two-hybrid library was 1.5 kb, and the ratio of recombinant colonies was about 90%. Human NDK/Nm23-H2 was found interacting with FMRP. NDK/Nm23-H2 interacted with FMRP exon 1-12, as well as FMRP isoforms without exon 12, and exons 14-17. NDK/Nm23-H2 couldn't interact with FMRP exon 1-6 and exon 2-7 fragments. CONCLUSIONS Human NDK/Nm23-H2 can bind FMRP directly. The interaction site of FMRP is located at its exon 1-11. This interaction in vitro might alter the intracellular distribution of NDK/Nm23-H2, and even regulates the transcription and expression of FMRP.
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Jhoo JW, Sang S, He K, Cheng X, Zhu N, Stark RE, Zheng QY, Rosen RT, Ho CT. Characterization of the triterpene saponins of the roots and rhizomes of blue cohosh (Caulophyllum thalictroides). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2001; 49:5969-5974. [PMID: 11743794 DOI: 10.1021/jf010814e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Seven triterpene saponins were isolated from n-butanol fractions of blue cohosh (Caulophyllum thalictroides) roots and rhizomes. Their structures were established by spectral ((1)H NMR, (13)C NMR, 2D-NMR, and APCI-MS) techniques and chemical reactions as hederagenin 3-O-alpha-L-arabinopyranoside (1); caulophyllogenin 3-O-alpha-L-arabinopyranoside (2); hederagenin 3-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-arabinopyranoside (3); 3-O-alpha-L-arabinopyranosyl-hederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (4); 3-O-alpha-L-arabinopyranosyl- caulophyllogenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (5); 3-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-arabinopyranosyl- echinocystic acid 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (6); 3-O-beta-D-glucopyranosyl-(1-->2)-alpha-L-arabinopyranosyl-hederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside (7). All seven compounds were identified in this species for the first time.
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Zhu N, Lu Q, Zhou Y. [Cell differentiation and down regulation of nm23 gene expression in HL-60 cells induced by 1,25 dihydroxyvitamin D3]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2001; 22:639-41. [PMID: 16200712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
OBJECTIVE To investigate the differentiation induction effect of 1,25 dihydroxyvitamin D3 on leukemia cell line HL-60 and its mechanisms. METHODS The changes of proliferation rate and differentiation in HL-60 cells treated with 1,25 dihydroxyvitamin D3 were observed by MTT test, surface marker analysis and NBT reduction reaction, the effects on cell cycle and nm23 gene expression by flow cytometry and RT-PCR. RESULTS After exposing to 1,25 dihydroxyvitamin D3, the proliferation was inhibited and the cells were induced to differentiate towards more mature monocytes. During differentiation, HL-60 cells were arrested in G1 phase and the expression of nm23 gene was down regulated. CONCLUSION 1,25 dihydroxyvitamin D3 could induce differentiation of HL-60 cells, this effect might be related to the down regulation of nm23 gene expression.
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142
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Zhu N, Kikuzaki H, Sheng S, Sang S, Rafi MM, Wang M, Nakatani N, DiPaola RS, Rosen RT, Ho CT. Furanosesquiterpenoids of Commiphora myrrha. JOURNAL OF NATURAL PRODUCTS 2001; 64:1460-1462. [PMID: 11720534 DOI: 10.1021/np010072j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An investigation on the gum exudates of Commiphora myrrha has led to the isolation of six sesquiterpenoids. On the basis of spectroscopic data interpretation, they were determined as two new furanosesquiterpenoids, rel-1S,2S-epoxy-4R-furanogermacr-10(15)-en-6-one (1) and rel-2R-methyl-5S-acetoxy-4R-furanogermacr-1(10)Z-en-6-one (2), and four known furanosesquiterpenoids, rel-3R-methoxy-4S-furanogermacra-1E,10(15)-dien-6-one (3), rel-2R-methoxy-4R-furanogermacr-1(10)E-en-6-one (4), furanogermacra-1(10)Z,4Z-dien-6-one, and curzerenone [6,7-dihydro-5beta-isopropenyl-3,6beta-dimethyl-6-vinylbenzofuran-4(5H)-one]. This is the first report of the relative stereochemistry for the known compounds 3 and 4. Compound 1 exhibited weak cytotoxic activity against a MCF-7 breast tumor cell line in a clonogenic assay, while the other five compounds were inactive in this assay.
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MESH Headings
- Antineoplastic Agents, Phytogenic/chemistry
- Antineoplastic Agents, Phytogenic/isolation & purification
- Antineoplastic Agents, Phytogenic/pharmacology
- Breast Neoplasms
- Burseraceae/chemistry
- Chromatography, Thin Layer
- Drugs, Chinese Herbal/chemistry
- Drugs, Chinese Herbal/isolation & purification
- Drugs, Chinese Herbal/pharmacology
- Female
- Humans
- Molecular Conformation
- Molecular Structure
- Nuclear Magnetic Resonance, Biomolecular
- Plants, Medicinal/chemistry
- Sesquiterpenes/chemistry
- Sesquiterpenes/isolation & purification
- Sesquiterpenes/pharmacology
- Sesquiterpenes, Germacrane
- Stereoisomerism
- Tumor Cells, Cultured/drug effects
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143
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Tang T, Dai K, Zhu N, Chen Y. A histomorphometric and molecular study on stress adaptability of freeze-dried bone allograft. Chin Med J (Engl) 2001; 114:1189-92. [PMID: 11729517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
OBJECTIVE To Investigate stress adaptability of freeze-dried bone allograft. METHODS Cortical and cancellous allograft were transplanted to each side of the midshaft diaphyseal ulna in two groups of 28 animals. The left transplanted allograft was free from fixation and bore a normal physiological load, while the right transplanted allograft was protected from loading by a simple external fixator and bore less load. Animals were sacrificed at the 2nd, 4th, 8th, 16th week after transplantation and specimens were taken out for bone histomorphometry studies and analysis of collagen gene expression by in situ cDNA-mRNA hybridization. RESULTS Labeled surface(LS) and bone mineral apposition rate(MAR) of the normally loaded graft-host bone interface were significantly higher than that of the less loaded side at the 4th, 8th, 16th week after transplantation. Parameters reflecting the internal repair process of the allograft, such as LS in cortical and cancellous bone or MAR in cortical bone of the normally loaded side were significantly higher than those of the less loaded side at the 16th week after transplantation. The result of in situ hybridization indicated that more osteoblast-like cells expressing the type I collagen gene were found in the interface or interior of normally loaded grafts. CONCLUSION The stimulus of physiologic load can accelerate the early union of allograft-host bone interface and later new bone creep substitution to the necrotic allograft.
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Chan SC, Chan MC, Wang Y, Che CM, Cheung KK, Zhu N. Organic light-emitting materials based on bis(arylacetylide)platinum(II) complexes bearing substituted bipyridine and phenanthroline ligands: photo- and electroluminescence from 3MLCT excited states. Chemistry 2001; 7:4180-90. [PMID: 11686597 DOI: 10.1002/1521-3765(20011001)7:19<4180::aid-chem4180>3.0.co;2-9] [Citation(s) in RCA: 325] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We present the synthesis and photophysical and electroluminescent properties for a series of platinum(II) alpha-diimine bis(arylacetylide) complexes. The molecular structures of five derivatives have been elucidated by X-ray crystallography. Intermolecular pi-pi interactions (between aromatic diimine and phenylacetylide moieties) are apparent in the crystal lattices of two of these. All bis(phenylacetylide) derivatives exhibit intense triplet metal-to-ligand charge transfer (MLCT) photoluminescence in the solid state and in fluid solutions at room temperature. The impact of different solvents, substituents on the diimine ligands, and complex concentrations upon their emissive behavior have been examined and demonstrates that their emission energies can be systematically modified. Application of the 3MLCT excited state of the [Pt(alpha-diimine) (C(triple bond)CPh)2] materials in single- and double-layer organic light-emitting devices are described. The bis(butadiynyl) complex [Pt(4,4'-dtbpy)(C(triple bond)C-C(triple bond)CPh)2] (dtbpy = 4,4'-di-tert-butyl-2,2'-bipyridine) displays strong solid-state and solution phosphorescence at 77 and 298 K; the associated excited state is proposed to arise from both acetylenic 3pi pi*(C(triple bond)C-C(triple bond)CPh) and 3MLCT [Pt --> pi*(diimine)] transitions.
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Sang S, Cheng X, Zhu N, Stark RE, Badmaev V, Ghai G, Rosen RT, Ho CT. Flavonol glycosides and novel iridoid glycoside from the leaves of Morinda citrifolia. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2001; 49:4478-4481. [PMID: 11559157 DOI: 10.1021/jf010492e] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
One new iridoid glycoside and five known flavonol glycosides have been isolated from the leaves of Morinda citrifolia. The new iridoid exists as an epimeric mixture in solution. Complete assignments of the proton and carbon chemical shifts for the individual epimers were accomplished on the basis of high-resolution 1D and 2D NMR data. Their antioxidative activities were measured. All of these compounds showed DPPH free radical scavenging activity at the concentration of 30 microM.
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Song M, Helguera G, Eghbali M, Zhu N, Zarei MM, Olcese R, Toro L, Stefani E. Remodeling of Kv4.3 potassium channel gene expression under the control of sex hormones. J Biol Chem 2001; 276:31883-90. [PMID: 11427525 DOI: 10.1074/jbc.m101058200] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Kv4.3 channels are important molecular components of transient K(+) currents (Ito currents) in brain and heart. They are involved in setting the frequency of neuronal firing and heart pacing. Altered Kv4.3 channel expression has been demonstrated under pathological conditions like heart failure indicating their critical role in heart function. Thyroid hormone studies suggest that their expression in the heart may be hormonally regulated. To explore the possibility that sex hormones control Kv4.3 expression, we investigated whether its expression changes in the pregnant uterus. This organ represents a unique model to study Ito currents, because it possesses this type of K(+) current and undergoes dramatic changes in function and excitability during pregnancy. We cloned Kv4.3 channel from myometrium and found that its protein and transcript expression is greatly diminished during pregnancy. Experiments in ovariectomized rats demonstrate that estrogen is one mechanism responsible for the dramatic reduction in Kv4.3 expression and function prior to parturition. Furthermore, the reduction of plasma membrane Kv4.3 protein is accompanied by a perinuclear localization suggesting that cell trafficking is also controlled by sex hormones. Thus, estrogen remodels the expression of Kv4.3 in myometrium by directly diminishing its transcription and, indirectly, by altering Kv4.3 delivery to the plasma membrane.
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Sang S, He K, Liu G, Zhu N, Cheng X, Wang M, Zheng Q, Dong Z, Ghai G, Rosen RT, Ho CT. A new unusual iridoid with inhibition of activator protein-1 (AP-1) from the leaves of Morinda citrifolia L. Org Lett 2001; 3:1307-9. [PMID: 11348221 DOI: 10.1021/ol0156648] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure in text] From the leaves of Morinda citrifolia, a new unusual iridoid, named citrifolinoside (1), showing significant inhibition of UVB-induced Activator Protein-1 (AP-1) activity in cell cultures, has been isolated. Its structure was elucidated on the basis of detailed high-field 1D and 2D spectral analysis.
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Miao J, Ling YZ, Zhu N, Lei XP. [Three dimensional quantitative structure activity relationship of P450(17) alpha inhibitors of 17-substituted steroids]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 2001; 36:507-10. [PMID: 12585081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
AIM To develop a three dimensional quantitative structure activity relationship (3D-QSAR) model and gain further insights into the requirements for potential P450(17) alpha inhibitors. METHODS AND RESULTS A predictive 3D pharmacophore model was established based on comparative molecular field analysis (CoMFA). The correlation between the activities and structures was significant with cross-validated value (R2cv), non-cross-validated value (R2) and standard error of estimate (SEE) of 0.538, 0.799 and 0.257, respectively. According to this model, the predicted inhibition activities of three compounds synthesized in our laboratory were compatible to actual activities. CONCLUSION This model would contribute to the understanding of the interaction between the inhibitors and P450(17) alpha and rational design of novel lead molecules.
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Mitra S, Feng C, Zhu N, McAllister G. Application and field validation of a continuous nonmethane organic carbon analyzer. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2001; 51:861-868. [PMID: 11417677 DOI: 10.1080/10473289.2001.10464322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Nonmethane organic carbon (NMOC) is a measure of total organic carbon except for that from CH4. We recently reported the development of online instrumentation for continuous NMOC monitoring. This instrument, referred to as C-NMOC, uses a microsorbent trap in combination with a gas-sampling valve as the sampling interface. A conventional oxidation/reduction NMOC detector is used for quantitation. In addition to being an online concentrator and an injector, the microtrap serves as a separator that isolates NMOC from H2O, CO, CO2, CH4, and other background gases. Therefore, the C-NMOC is able to handle high concentrations of background gases commonly found in stack emissions and has detection limits in the ppb levels. This paper reports the results of field validation and testing of a C-NMOC analyzer at a coatings facility in the eastern United States. The instrument was able to monitor the process transients in real time, based on which corrective actions could be taken. It demonstrated good accuracy, high precision, and long-term stability.
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Sang S, Cheng X, Zhu N, Wang M, Jhoo JW, Stark RE, Badmaev V, Ghai G, Rosen RT, Ho CT. Iridoid glycosides from the leaves of Morinda citrifolia. JOURNAL OF NATURAL PRODUCTS 2001; 64:799-800. [PMID: 11421748 DOI: 10.1021/np010011l] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new iridoid glucoside (1), named citrifolinoside A, was isolated from the leaves of Morinda citrifolia along with the known iridoids asperuloside and asperulosidic acid. The structure of 1 was established by interpretation and full assignments of NMR spectroscopic data.
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