451
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Chen S, Peng X, Liu J. [Effect of Sophora flavescens Ait on cultured beating myocardial cells of coxsackie B3 virus infected newborn rat]. ZHONGHUA SHI YAN HE LIN CHUANG BING DU XUE ZA ZHI = ZHONGHUA SHIYAN HE LINCHUANG BINGDUXUE ZAZHI = CHINESE JOURNAL OF EXPERIMENTAL AND CLINICAL VIROLOGY 2000; 14:137-40. [PMID: 11503044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
OBJECTIVE Coxsackie B viruses (CVB3) are considered to be the most common etiologic agents of viral myocarditis. There are not any special anti-CVB3 drugs yet. From previous studies, the anti-CVB3 affect of sophora flavescens ait (SFA) had been discovered. Our experiment was to study the anti-CVB3 ability of SFA to cultured heating myocardial cells of CVB3 infected newborn rat. METHODS The myocardial cells were divided into four groups: 1. infected group (n = 8), infected only with CVB3, not adding SFA; 2. treated group (n =8), infected with CVB3, adding SFA (100 microg/ml); 3. drug group (n=6), adding SFA (100 microg/ml) only; 4. control group (n = 6), not infected with CVB3, not adding SFA. RESULTS The myocardial cells of the infected group had cell pathogenic effect (CPE) on the second day after virus inoculation, the CPE progressed rapidly from + to ++++. In contrast, no CPE in the other three groups was found. The LDH and SGOT of the infected group were higher than that in the other three groups, showing a significant difference (P <0.05). The virus titer of the infected group was higher than that of the treated group. There was no influence on normal myocardial cells if the concentration of SFA was lower than 300 microg/ml. When the concentration of SFA was 6.25 microg/ml 200 microg/ml, it showed protective effect on infected myocardial cells. CONCLUSIONS The results of the experiment suggest that SFA might inhibit CVB3 replication in myocardial cells.
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452
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Peng X, Yu G, Gao Y. [The expression of cathepsin-D in salivary adenoid cystic carcinoma]. ZHONGHUA KOU QIANG YI XUE ZA ZHI = ZHONGHUA KOUQIANG YIXUE ZAZHI = CHINESE JOURNAL OF STOMATOLOGY 2000; 35:206-8. [PMID: 11780226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the relationship between Cathepsin-D(Cath-D) and the prognosis of patients with salivary adenoid cystic carcinoma (SACC). METHODS The immunoactivity of Cath-D of 52 cases with SACC was determined by immunohistochemistry method (Streptavidin-Biotin method). The relationship between Cath-D and the histological type, clinical stage, local recurrence, distant metastasis of the tumor and survival rate of the patients with SACC were analysed. RESULTS Statistical analysis showed that the expression levels of Cath-D were correlated positively with distant metastasis potential and clinical stage (P < 0.05), and had no significant relation with histological type, local recurrence and survival rate (P > 0.05). CONCLUSIONS Cath-D can facilitate invasiveness and distant metastasis of SACC; evaluation of Cath-D can act as a predictor of distant metastasis of SACC and direct the clinical treatment.
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453
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Xü C, Peng X, Liu S. [Localization of endothelin-1 in biopsies from oral submucous fibrosis: immunoelectron microscopic study]. ZHONGHUA KOU QIANG YI XUE ZA ZHI = ZHONGHUA KOUQIANG YIXUE ZAZHI = CHINESE JOURNAL OF STOMATOLOGY 2000; 35:215-7. [PMID: 11780229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To determine the endothelin-1 (ET-1) immunoreactivity in biopsies from human oral submucous fibrosis (OSF) and to investigate the relation between ET-1 and OSF. METHODS The localization of ET-1 in biopsies from OSF was observed with immunoelectron microscopic techniques. RESULTS High-density deposits existed predominantly in the cytoplasm of epithelial cells, fibroblasts and endothelial cells, but not found in the biopsies of normal controls. In the biopsies of OSF, high-density granules were lined on the cell membrane, possibly on the rough endoplasmic reticulum and the mitochondria of the epithelial cells and of the fibroblasts. But a few granules were seen in the cytoplasm of the endothelial cells of microvesseles. CONCLUSION ET-1 is one of the pathogenetic factors of OSF.
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454
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Chang TL, Peng X, Fu XY. Interleukin-4 mediates cell growth inhibition through activation of Stat1. J Biol Chem 2000; 275:10212-7. [PMID: 10744706 DOI: 10.1074/jbc.275.14.10212] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Interleukin-4 (IL-4) activates Stat6 (signal transducer and activator of transcription 6) and plays multiple roles in regulation of the immune system. IL-4 also triggers phosphorylation of insulin receptor substrate (IRS), leading to stimulation of cell growth. Moreover, IL-4 inhibits proliferation of a variety of cells, but the molecular mechanism of its growth inhibitory effect is not understood. In this study, we demonstrated that IL-4 inhibited cell growth of colon carcinoma cell lines (HT29 and WiDr) but promoted cell growth of Burkitt's lymphoma cell lines (BL30 and BL41) in a dose-dependent manner. The growth inhibition was not dependent on Stat6 activation, because Stat6 was activated at similar levels in all cell lines in response to IL-4. Strikingly, IL-4 activated Stat1 in colon carcinoma cell lines but not in Burkitt's lymphoma cell lines. Therefore, these results suggest that IL-4 induced Stat1 activation, resulting in growth inhibition of colon carcinoma cell lines. Importantly, we present evidence that Stat1 is necessary for IL-4-mediated growth inhibition using Stat1-deficient and Stat1-reconstituted cells. The growth inhibitory effect of IL-4 was diminished in Stat1-deficient cells, whereas it was restored in Stat1-reconstituted cells. In addition, the expression of dominant-negative Stat1 in HT29 cells led to the loss of growth inhibition in response to IL-4. Taken together, our data suggest that IL-4 activates Stat1, leading to cell growth inhibition in colon cancer cells. Thus, this study demonstrates, for the first time, a molecular mechanism by which IL-4 inhibits cell growth.
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455
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MacFarlane AS, Peng X, Meissler JJ, Rogers TJ, Geller EB, Adler MW, Eisenstein TK. Morphine increases susceptibility to oral Salmonella typhimurium infection. J Infect Dis 2000; 181:1350-8. [PMID: 10762566 DOI: 10.1086/315403] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/1999] [Revised: 01/05/2000] [Indexed: 11/04/2022] Open
Abstract
This study examined the effect of morphine on oral infection with virulent Salmonella typhimurium. Animals were treated with a 75-mg slow-release morphine pellet followed by inoculation with salmonellae. Morphine markedly sensitized mice to oral infection, as assessed by survival, mean survival time, and colony culture. By 24 h after Salmonella inoculation, morphine-treated mice had a 105-fold difference in number of organisms in the Peyer's patches, compared with controls. The opioid antagonist naltrexone significantly blocked Salmonella colonization in Peyer's patches and reduced Salmonella burden in other organs, indicating that morphine acts at least in part via an opioid receptor-mediated pathway. The data show that morphine markedly potentiates Salmonella infection at the gastrointestinal portal of entry and enhances subsequent dissemination of Salmonella organisms. The results have implications for potentiating gastrointestinal opportunistic infections in intravenous drug abusers and in opioid-medicated postsurgical patients.
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456
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Peng X, Liu L, Wu J, Li Y, Hou Z, Xu L, Wang W, Li F, Ye M. Wide-range amplified spontaneous emission wavelength tuning in a solid-state dye waveguide. OPTICS LETTERS 2000; 25:314-316. [PMID: 18059865 DOI: 10.1364/ol.25.000314] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Amplified spontaneous emission (ASE) in an organic-dye- (DCM-) doped poly(methyl methacrylate)/silica-gel hybrid material planar waveguide was investigated. ASE wavelength control and tuning in a wedge waveguide were realized. The tuning range of the waveguide can reach as much as 30 nm. This method can be applied to wide-range wavelength tuning in solid-state tunable lasers.
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457
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Peng X, Wang Q. [Preparation of hepatitis C virus nonstructural region antigens and detection of their relative antibodies]. ZHONGHUA SHI YAN HE LIN CHUANG BING DU XUE ZA ZHI = ZHONGHUA SHIYAN HE LINCHUANG BINGDUXUE ZAZHI = CHINESE JOURNAL OF EXPERIMENTAL AND CLINICAL VIROLOGY 2000; 14:80-4. [PMID: 11503033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
OBJECTIVE To investigate the relationship between HCV NS3 and the pathogenesis of HCV and research a method to assess the therapeutic effect of interferon (lEN) in clinic. METHODS In a retrospective research, we used HCV-NS3 antigens of different terminals expressed in E. coli which contained the recombinant plasmids involving amino terminal region (N') or carboxyl terminal region (C') of HCV-NS3, to detect the antibodies by Western blot in sera of 63 hepatitis C patients who were treated with IFN. RESULTS It proved that antibodies against HCV-NS3 N' and/or HCV NS3 C' terminals in hepatitis C patients may predict the treatment result of IFN, especially in the patients with chronic hepatitis C. CONCLUSIONS The detection of antibodies against HCV-NS3 N' and/or C' terminals may be used for evaluation of IFN treatment, especially in chronic hepatitis C ones.
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458
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Charlebois RL, Singh RK, Chan-Weiher CC, Allard G, Chow C, Confalonieri F, Curtis B, Duguet M, Erauso G, Faguy D, Gaasterland T, Garrett RA, Gordon P, Jeffries AC, Kozera C, Kushwaha N, Lafleur E, Medina N, Peng X, Penny SL, She Q, St Jean A, van der Oost J, Young F, Zivanovic Y, Doolittle WF, Ragan MA, Sensen CW. Gene content and organization of a 281-kbp contig from the genome of the extremely thermophilic archaeon, Sulfolobus solfataricus P2. Genome 2000; 43:116-36. [PMID: 10701121 DOI: 10.1139/g99-108] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The sequence of a 281-kbp contig from the crenarchaeote Sulfolobus solfataricus P2 was determined and analysed. Notable features in this region include 29 ribosomal protein genes, 12 tRNA genes (four of which contain archaeal-type introns), operons encoding enzymes of histidine biosynthesis, pyrimidine biosynthesis, and arginine biosynthesis, an ATPase operon, numerous genes for enzymes of lipopolysaccharide biosynthesis, and six insertion sequences. The content and organization of this contig are compared with sequences from crenarchaeotes, euryarchaeotes, bacteria, and eukaryotes.
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459
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Zeng S, Peng X. [Tissue culture and rapid propagation of Aloe arborescens]. ZHONG YAO CAI = ZHONGYAOCAI = JOURNAL OF CHINESE MEDICINAL MATERIALS 2000; 23:63-5. [PMID: 12575139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Tissue culture and rapid propagation of Aloe arborescens have been studied. The main results are as follows: the optimum medium for cluster shoots induction is MS + 6-BA 3.0 mg/L + NAA 0.2 mg/L; for cluster shoots propagation is MS + 6-BA 2.0 mg/L + NAA 0.2 mg/L; for roots induction is 1/2 MS + NAA 0.5 mg/L. The survival rate of the tube plantlets is 100% in the transplanting. Cutting down the cost of medium in large scale of production have been studied also.
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460
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He Y, Bowman VD, Mueller S, Bator CM, Bella J, Peng X, Baker TS, Wimmer E, Kuhn RJ, Rossmann MG. Interaction of the poliovirus receptor with poliovirus. Proc Natl Acad Sci U S A 2000; 97:79-84. [PMID: 10618374 PMCID: PMC26619 DOI: 10.1073/pnas.97.1.79] [Citation(s) in RCA: 171] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The structure of the extracellular, three-domain poliovirus receptor (CD155) complexed with poliovirus (serotype 1) has been determined to 22-A resolution by means of cryo-electron microscopy and three-dimensional image-reconstruction techniques. Density corresponding to the receptor was isolated in a difference electron density map and fitted with known structures, homologous to those of the three individual CD155 Ig-like domains. The fit was confirmed by the location of carbohydrate moieties in the CD155 glycoprotein, the conserved properties of elbow angles in the structures of cell surface molecules with Ig-like folds, and the concordance with prior results of CD155 and poliovirus mutagenesis. CD155 binds in the poliovirus "canyon" and has a footprint similar to that of the intercellular adhesion molecule-1 receptor on human rhinoviruses. However, the orientation of the long, slender CD155 molecule relative to the poliovirus surface is quite different from the orientation of intercellular adhesion molecule-1 on rhinoviruses. In addition, the residues that provide specificity of recognition differ for the two receptors. The principal feature of receptor binding common to these two picornaviruses is the site in the canyon at which binding occurs. This site may be a trigger for initiation of the subsequent uncoating step required for viral infection.
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461
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Sun J, Peng X, Van Impe J, Vanderleyden J. The ntrB and ntrC genes are involved in the regulation of poly-3-hydroxybutyrate biosynthesis by ammonia in Azospirillum brasilense Sp7. Appl Environ Microbiol 2000; 66:113-7. [PMID: 10618211 PMCID: PMC91793 DOI: 10.1128/aem.66.1.113-117.2000] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Azospirillum brasilense Sp7 and its ntrA (rpoN), ntrBC, and ntrC mutants have been evaluated for their capabilities of poly-3-hydroxybutyrate (PHB) accumulation in media with high and low ammonia concentrations. It was observed that the ntrBC and ntrC mutants can produce PHB in both low- and high-C/N-ratio media, while no significant PHB production was observed for the wild type or the ntrA mutant in low-C/N-ratio media. Further investigation by fermentation analysis indicated that the ntrBC and ntrC mutants were able to grow and accumulate PHB simultaneously in the presence of a high concentration of ammonia in the medium, while little PHB was produced in the wild type and ntrA (rpoN) mutant during active growth phase. These results provide the first genetic evidence that the ntrB and ntrC genes are involved in the regulation of PHB synthesis by ammonia in A. brasilense Sp7.
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462
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Peng X, Huang J, Ji L. [The hydrogen bond between 5-(2-carboxyphenyl)-10, 15, 20-triphenylporphyrin and amino acid ester--study with UV-Vis titration and 1H-NMR]. GUANG PU XUE YU GUANG PU FEN XI = GUANG PU 1999; 19:884-885. [PMID: 15822326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The hydrogen bonds between the hydrogen of pyrrols in 5-(2-carboxyphenyl)-10,15,20-triphenylporphyrin and the oxygen of the carboxyl group of amino acid ester were confirmed by UV-Vis spectroscopic titration method and 1H-NMR. When amino acid ester was added to o-TPPCO2H solution in CHCl3, the Soret and Q and red-shifted dramatically and several isobestic points could be observed in UV-Vis spectra. In 1H-NMR, the signal of the hydrogen atoms of pyrrole in o-TPPCO2H (-2.78 ppm) decreased and a new signal in 0.260 ppm emerged, when o-TPPCO2H mixed with L-PheOEt at 1 : 1 (mol/mol).
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463
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Maruo T, Laoag-Fernandez JB, Takekida S, Peng X, Deguchi J, Samoto T, Kondo H, Matsuo H. Regulation of granulosa cell proliferation and apoptosis during follicular development. Gynecol Endocrinol 1999; 13:410-9. [PMID: 10685335 DOI: 10.3109/09513599909167588] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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464
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Peng X, Zhou W, Cao D, Liu C, Li Z. [Changes and significance of natural killer cell, IL-2, IL-6 and TNF alpha of heroin addicts after detoxification]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1999; 30:449-51. [PMID: 11387967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
In order to find out the activity of NKC and production of IL-2 in the peripheral blood mononuclear cells and the level of IL-6 and TNF alpha in the peripheral blood serum, we investigated 51 herion addicts who were in the course of detoxification. MTT colorimetric assay and ELISA assay methods were adopted. The results showed that, in the herion addicts, NK activity was 30.11 +/- 5.2%, IL-2 activity was 8.06 +/- 1.66 IU/ml, IL-6 level was 61.17 +/- 12.07 pg/ml, and TNF alpha level was 91.83 +/- 19.19 pg/ml, whereas in the healthy controls, the results were 44.89 +/- 4.75%, 15.91 +/- 3.83 IU/ml, 22.18 +/- 9.31 pg/ml and 30.55 +/- 11.94 pg/ml respectively. When the herion addicts were subjected to detoxication, their NKC and IL-2 activities, IL-6 and TNF alpha levels gradually restored to normal, and were correlated with the time of their detoxification (NKC: r = 0.626, P < 0.001; IL-2: r = 0.684, P < 0.001; IL-6: r = -0.791, P < 0.001; TNF alpha: r = -0.703, P < 0.001).
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465
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Park JS, Park SJ, Peng X, Wang M, Yu MA, Lee SH. Involvement of DNA-dependent protein kinase in UV-induced replication arrest. J Biol Chem 1999; 274:32520-7. [PMID: 10542299 DOI: 10.1074/jbc.274.45.32520] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cells exposed to UV irradiation are predominantly arrested at S-phase as well as at the G(1)/S boundary while repair occurs. It is not known how UV irradiation induces S-phase arrest and yet permits DNA repair; however, UV-induced inhibition of replication is efficiently reversed by the addition of replication protein A (RPA), suggesting a role for RPA in this regulatory event. Here, we show evidence that DNA-dependent protein kinase (DNA-PK), plays a role in UV-induced replication arrest. DNA synthesis of M059K (DNA-PK catalytic subunit-positive (DNA-PKcs(+))), as measured by [(3)H]thymidine incorporation, was significantly arrested by 4 h following UV irradiation, whereas M059J (DNA-PKcs(-)) cells were much less affected. Similar results were obtained with the in vitro replication reactions where immediate replication arrest occurred in DNA-PKcs(+) cells following UV irradiation, and only a gradual decrease in replication activity was observed in DNA-PKcs(-) cells. Reversal of replication arrest was observed at 8 h following UV irradiation in DNA-PKcs(+) cells but not in DNA-PKcs(-) cells. Reversal of UV-induced replication arrest was also observed in vitro by the addition of a DNA-PK inhibitor, wortmannin, or by immunodepletion of DNA-PKcs, supporting a positive role for DNA-PK in damage-induced replication arrest. The RPA-containing fraction from UV-irradiated DNA-PKcs(+) cells poorly supported DNA replication, whereas the replication activity of the RPA-containing fraction from DNA-PKcs(-) cells was not affected by UV, suggesting that DNA-PKcs may be involved in UV-induced replication arrest through modulation of RPA activity. Together, our results strongly suggest a role for DNA-PK in S-phase (replication) arrest in response to UV irradiation.
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466
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Tao L, Peng X. [Effection of children airway foreign bodies on blood acid-base disturbances]. LIN CHUANG ER BI YAN HOU KE ZA ZHI = JOURNAL OF CLINICAL OTORHINOLARYNGOLOGY 1999; 13:505-6. [PMID: 12541376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
Abstract
OBJECTIVE To explore the effects of children airway foreign bodies on blood acid-base disturbances. METHOD To detect the blood-gas and electrolyte of 50 cases by children airway foreign bodies (test group), they were compared with 50 cases normal children (control group). To calculate anion gap (AG), to determine types of acidbase disturbances. RESULT The blood-gas and K+ were significant difference between that two groups. In the test group, there were 25 simple and 19 mixed acid-base disturbances; 6 acid-base balances. There were 31 high AG, 18 normal AG, one low AG. CONCLUSION Children airway foreign bodies can cause acid-base disturbances. It was major in simple metabolic acidosis and mixed metabolic acidosis with respiratory alkalosis, it was more in high AG-metabobic acidosis.
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467
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Peng X, Feng J, Wang S. [Effects of nitric oxide on platelet function in burned rats]. ZHONGHUA ZHENG XING SHAO SHANG WAI KE ZA ZHI = ZHONGHUA ZHENG XING SHAO SHANG WAIKF [I.E. WAIKE] ZAZHI = CHINESE JOURNAL OF PLASTIC SURGERY AND BURNS 1999; 15:428-30. [PMID: 11501077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
OBJECTIVE To investigate the effects of nitric oxide (NO) on rat platelet function after burn injury. METHODS Wistar rats with 30% TBSA full thickness burns were used as model, indices of platelet functions including platelet aggregation rate in first minute (PAR-1), maximal platelet aggregation rate (PAR-m), platelet dissipation rate (PDR) and platelet adhesion rate (PAR) were determined in four groups, namely burn control (B), NO donor (sin-1), NO synthesis inhibitor (L-NAME) and the normal control (C). RESULTS The PAR-1, PAR-m and PAR were significantly increased and the PDR was decreased remarkably after burn injury. In sin-1 group the PAR-1, PAR-m and PAR were obviously lower and the PDR was higher than that of B group (P < 0.05-0.01). In L-NAME group the PAR-1 was higher and the PDR was lower as compared with B group, but the PAR-m and PAR showed no significant differences between two groups. CONCLUSIONS The ability of platelet adhesion and aggregation induced by activated platelet are increased after burn injury. NO can partially reduce the degree of platelet activation and inhibit platelet aggregation. Moreover, it may dissipate aggregated platelets.
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468
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Yin M, Cheng L, Miyoshi A, Peng X, Ruan Z, Shi H, Fang R, Sahashi N, Imano A. [Epidemiological survey on orchard pollinosis]. LIN CHUANG ER BI YAN HOU KE ZA ZHI = JOURNAL OF CLINICAL OTORHINOLARYNGOLOGY 1999; 13:513-4. [PMID: 12541379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the prevalence of Orchard Pollinosis in China. METHOD From 1995 to 1998, an epidemiological survey on orchard pollinosis was carried on among 1,660 primary and middle school students and 2,167 university students, including questionnaire investigation, nasal inspection and scratch test. From April to June of 1998, a clinical investigation of orchard pollinosis was adopted among 30 patients of allergic rhinitis including scratch test and nasal mucosa test. RESULT 1. The total positive rate of orchard pollen scratch test was 6.7%, and the prevalence of orchard pollinosis was 0.37%. 2. 5 cases (16.7%) were hypersensitive to orchard pollen clinically in allergen test. CONCLUSION Orchard pollinosis is one kind of important pollinosis and should be paid high attention to.
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469
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Peng X, Pan X, Kenga M. [Isolation and sequencing of a novel form of cytochrome p-450 4F family from human liver]. ZHONGHUA YI XUE ZA ZHI 1999; 79:860-2. [PMID: 11715494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVE To isolate and sequence a novel gene of cytochrome p-450 4F family. METHODS A cDNA was isolated by touchdown PCR from a cDNA library of human fetal liver using specific primers. The DNA sequencing was done by an auto-sequence machine through forward and reverse directions. The expression of cDNA encoded protein was tested in yeast cells. RESULTS Sequencing of the full length cDNA revealed a sequence of 1,980 nucleotides coding for a protein of 520 amino acids with a molecular weight of 59,700 Da. The cDNA-deduced amino acid sequence showed 92% homology to that of human polymorphonuclear leukocytes (PMN) LTB4-hydroxylase (CYP4F3) and 91% homology to that of human liver LTB4 hydroxylase (CYP4F2). The expression of protein in the yeast cells showed a fusion protein with a molecular weight of about 86,000 Da and 60,000 Da after a proteolytic removal of the GST affinity tag. It was confirmed by RT-PCR that the gene was expressed in the adult liver. CONCLUSION Our results clearly show a novel form of cytochrome p-450 4F in human liver.
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470
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Peng X, Feng F, Zhang W. [Expression of multidrug resistance-associated protein in human non-small cell lung cancer]. ZHONGHUA JIE HE HE HU XI ZA ZHI = ZHONGHUA JIEHE HE HUXI ZAZHI = CHINESE JOURNAL OF TUBERCULOSIS AND RESPIRATORY DISEASES 1999; 22:655-8. [PMID: 11776518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the expression of the multidrug resistance-associated protein(MRP) gene and MRP in human non-small-cell lung cancer tissues and to determine whether such expression was related to cell type, differentiation, tumour size, lymph node metastasis and prognosis. METHODS 92 paraffin-embeded lung tumor samples (43 squamous cell carcinoma, 49 adenocarcinoma) and 16 fresh non-small-cell lung cancer samples were examined by using immunohistochemistry method and the reverse transcription-polymerase chain reaction (RT-PCR) technology respectively. RESULTS The expression of MRP mRNA and MRP were detectable in 31% (5-16) and 54% (50/92) of non-small-cell lung cancer specimens respectively. Eighteen(42%) squamous cell carcinoma specimens and thirty-two(65%) adenocarcinoma specimens showed positive immunostaining for MRP(P < 0.05). The expression of MRP was not related to tumour size, lymph node metastasis and cell differentiation significantly(P > 0.05). The five-year survival rate after operation of patients with MRP-positive tumours and MRP-negative tumours were 16% (8/50), 52% (22/42) respectively. Patients with MRP-positive tumours had shorter survival time than the MRP-negative patients significantly(P < 0.01). CONCLUSIONS Adenocarcinoma had higher MRP expression than squamous carcinoma significantly, positive MRP immunostaining appears to be an independent indicator of poor prognosis in NSCLC.
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Abstract
1. NBPA is a derivative of 3-n-butylpathalide isolated from Apium granolens Linn. 2. At concentrations ranging from 6 x 10(-6) to 10(-6) mol/L, NBPA inhibited the L-type calcium current in guinea-pig myocardial cells and cultured human neuroblastoma cells. 3. At 10(-6) mol/L, NBPA markedly inhibited calcium-dependent and -independent release of glutamate from synaptosomes. 4. The [31P] nuclear magnetic resonance spectrum has shown that pretreatment with NBPA at 15 mg/kg, i.p., improved energy metabolism. 5. In situ hybridization has shown that 10 and 20 mg/kg, i.p., NBPA prior to cerebral artery occlusion can accelerate the expression of heat shock protein 70 mRNA and inhibit c-fos mRNA expression. 6. It has been shown that NBPA decreases the nitric oxide content and bc nitric oxide synthase (NOS) activity in the global cerebral ischaemia-reperfusion model in rats. In addition, it has been shown that NBPA significantly inhibits the expression of inducible NOS protein.
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Abstract
A study of the abnormal sex ratio at birth in China reveals that it is not an entirely new phenomenon that emerged since the 1980s, but is simply more visible at present. Deliberate intervention to determine the sex of children has existed in the past few decades, at least in certain groups. Apart from modern medical methods, traditional Chinese medical practice is shown to be highly accurate in identifying the sex of a fetus. This may lead to sex-selective abortion and an abnormal sex ratio at birth. The possible causes of the abnormal sex ratio at birth include not only the real imbalance due to the disturbance of social factors, but also a spurious one attributable to the undercounting of female births. The real magnitude of the imbalance has been exaggerated by statistical error. The phenomenon is a complicated one reflecting the comprehensive socioeconomic setting. Among these factors, the stage of the fertility transition is one of the most decisive.
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Peng X, Gao Z, Chen X. [The significance of TT virus detection in persons with elevated alanine aminotransferase during routine medical check up and patients with liver diseases]. ZHONGHUA SHI YAN HE LIN CHUANG BING DU XUE ZA ZHI = ZHONGHUA SHIYAN HE LINCHUANG BINGDUXUE ZAZHI = CHINESE JOURNAL OF EXPERIMENTAL AND CLINICAL VIROLOGY 1999; 13:276-9. [PMID: 12569764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the significance of the new DNA virus (TTV) infection in persons with elevated alanine aminotransferase (ALT) during routine medical check up and patients with liver diseases, and analyze its pathogenesis. METHODS PCR was used in the detection of TTV DNA in 19 serum samples from ALT elevated persons and 41 from ALT normal persons during their routine medical check up, and 182 serum samples from patients with various kinds of liver diseases. PCR products were confirmed by RFLP. Other hepatitis viruses were simultaneously detected using routine methods. RESULTS TTV DNA was detected in 10.53% (2/19) and 2.44% (1/41) in groups of ALT elevated and control respectively with no significant difference between their detective rates (P > 0.05). There were 9 cases with current HBV infection, 1 case with hepatitis C and 1 case with hepatitis A in group of elevated ALT. Two TTV positive cases were both superinfected with HBV. The detecting rate of TTV DNA in patients with liver diseases was 4.4%. Only one case out of 18 non A to G hepatitis showed TTV DNA in serum. CONCLUSION There were TTV infections in Chinese population. The main cause for ALT elevation in persons during routine medical check up was HBV infection. There were TTV infections in patients with liver diseases too. However, TTV wasn't the main cause of non A to G hepatitis. Thus, the pathogenesis of TTV might be very weak.
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474
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Qu W, Peng X, Wu D, Xiao B. [New method for the isolation of astroglial cells and oligodendrocytes]. WEI SHENG YAN JIU = JOURNAL OF HYGIENE RESEARCH 1999; 28:263-6. [PMID: 12712691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Based on the different properties of cellular adhesions, developmental time-courses and growth pattern of astroglial cells and oligodendrocytes, a method of isolating glial cells in vitro was developed. The observations under inverted light microscope and scan electronic microscope identified that the morphology of isolated cells were consistent with the previous description. Immunocytochemical examination showed the expressions of markers, the glial fibrillary acidic protein (GFAP) of astroglia cells and the myelin basic protein (MBP) of oligodendrocytes were consistent with the isolated cells. All parameters showed that the isolated glial cells were pure, and the new methods were easy and reliable.
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475
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Deng L, Chen H, Zheng H, Peng X. [A study on ovariectomized goat osteoblast culture in vitro]. SHENG WU YI XUE GONG CHENG XUE ZA ZHI = JOURNAL OF BIOMEDICAL ENGINEERING = SHENGWU YIXUE GONGCHENGXUE ZAZHI 1999; 16:355-8. [PMID: 12552761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Osteoblasts were isolated from the frontal parietal bone of ovariectomized goat and were confirmed by testing for multiple biological features. The results showed that the goat osteoblasts cultured had the typical morphological feature of osteoblasts, the activity of alkaline phosphatase, and the ability of calcification in vitro. Also, the results proved that these goat osteoblasts in vitro had the same function and features as those in vivo. The experimental techniques in this study have provided a useful system for researches in bone metabolism.
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