351
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Benda GI, Engel RC, Zhang YP. Prolonged inactive phases during the discontinuous pattern of prematurity in the electroencephalogram of very-low-birthweight infants. ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY 1989; 72:189-97. [PMID: 2465121 DOI: 10.1016/0013-4694(89)90243-5] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A consecutive cohort of 46 very-low-birthweight infants, who had routine electroencephalograms (EEGs) while in the neonatal intensive care unit, were studied. Two infants were lost to follow-up and were excluded, leaving a study population of 44 infants. Their mean birthweight was 945 +/- 166 g, gestation 27.1 +/- 1.7 weeks. Thirteen infants died before discharge. The remaining 31 had a mean corrected age of 26.1 +/- 8.7 months at the time of the last visit. Three groups were distinguished: normal survivors, handicapped survivors and non-survivors. The longest inactive phase encountered in the discontinuous EEG was the yardstick of the study with 3 subdivisions: less than 20 sec. 20-29 sec and equal to or more than 30 sec. The data showed a relative increase in poor outcome with increasing duration of inactivity (P less than 0.05) and, conversely, a favorable outcome with the absence of 20 sec or longer inactivity (P less than 0.001). All infants received therapeutic doses of phenobarbital during the early part of their illness which could have affected their EEG. Mean phenobarbital levels, obtained close to the time of the EEG, however, did not differ significantly and failed to show a significant relationship between the duration of the inactive phase and drug level observed. Inactive phases greater than or equal to 30 sec were more common (P less than 0.01) in infants with intraventricular hemorrhage. We conclude: although full recovery and normal outcome have been documented, prolonged isoelectric phases beyond 30 sec are more common in infants with fatal outcome.
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352
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Abstract
Plaque-forming viruses of the unicellular, eucaryotic, exsymbiotic, Chlorella-like green algae strain NC64A, which are common in the United States, were also present in fresh water collected in the People's Republic of China. Seven of the Chinese viruses were examined in detail and compared with the Chlorella viruses previously isolated in the United States. Like the American viruses, the Chinese viruses were large polyhedra and sensitive to chloroform. They contained numerous structural proteins and large double-stranded DNA genomes of at least 300 kilobase pairs. Each of the DNAs from the Chinese viruses contained 5-methyldeoxycytosine, which varied from 12.6 to 46.7% of the deoxycytosine, and N6-methyldeoxyadenosine, which varied from 2.2 to 28.3% of the deoxyadenosine. Four of the Chinese virus DNAs hybridized extensively with DNA from the American virus PBCV-1, and three hybridized poorly.
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353
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Xia FY, Zhang YP, Gao J. [Allergen skin test: an analysis of the results in 1030 patients with bronchial asthma]. ZHONGHUA NEI KE ZA ZHI 1988; 27:289-91, 326. [PMID: 3197497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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354
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Zhang YP. [Serratia infection in burned patients]. 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 1988; 4:31-2. [PMID: 3151313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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355
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Zhang YP, Tzartos SJ, Wekerle H. B-T lymphocyte interactions in experimental autoimmune myasthenia gravis: antigen presentation by rat/mouse hybridoma lines secreting monoclonal antibodies against the nicotinic acetylcholine receptor. Eur J Immunol 1988; 18:211-8. [PMID: 2450756 DOI: 10.1002/eji.1830180205] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Many, but not all rat/mouse B hybridoma cells, producing monoclonal antibodies against determinants on the nicotinic acetylcholine receptor (AChR) of the electric organ of Torpedo californica, were able to immunologically present antigen to AChR-specific, Ia-compatible CD4+ T lymphocyte lines. Most of the hybridomas presented AChR in a privileged manner, i.e. they present AChR even more effectively than macrophages or dendritic cells. However, in the presentation of antigens other than AChR, they were inferior to macrophages. Moreover, some hybridomas were able to present AChR not only in soluble state, but also in membrane vesicles. Privileged presentation of AChR by hybridomas depended on the reactivity of the secreted immunoglobulins with epitopes of the AChR alpha chain, and on the expression of major histocompatibility complex class II antigens on the hybridoma cell surface. There was, however, no quantitative correlation between the actual AChR presentation capacity of one clone and the density of its surface Ia. Neither fine specificity nor isotype of hybridoma immunoglobulin are critical in determining privileged AChR presentation. We postulate that different hybridomas vary in their ability to take up soluble and particulate antigen, to process and to re-express them on the cellular membrane. This capacity may determine their efficiency to present antigen to T cells.
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356
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Sawada H, Hara A, Nakayama T, Nakagawa M, Inoue Y, Hasebe K, Zhang YP. Mouse liver dihydrodiol dehydrogenases. Identity of the predominant and a minor form with 17 beta-hydroxysteroid dehydrogenase and aldehyde reductase. Biochem Pharmacol 1988; 37:453-8. [PMID: 3276326 DOI: 10.1016/0006-2952(88)90214-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A major and a minor form of dihydrodiol dehydrogenase were co-purified with 17 beta-hydroxysteroid dehydrogenase and aldehyde reductase, respectively, to apparent homogeneity from liver cytosol of male ddY mice. The activities of dihydrodiol dehydrogenase and testosterone dehydrogenase or aldehyde reductase of the two enzyme forms comigrated electrophoretically. The major form of the enzyme oxidized 17 beta-hydroxysteroids and nonsteroidal alicyclic alcohols and reduced 17-ketosteroids and various synthetic carbonyl compounds, showing higher affinity for steroids than for xenobiotics. The activity of this enzyme form toward benzene dihydrodiol and testosterone exhibited identical thermostability and susceptibility to inhibition by quercitrin, SH-reagents, nonsteroidal estrogens and anti-inflammatory agents. On the other hand, the minor form of the enzyme, which oxidized benzene dihydrodiol but not 17 beta-hydroxysteroids, also reduced various aldehydes well and was specifically inhibited by barbiturates and sorbinil. These results indicate that the major form of dihydrodiol dehydrogenase is identical to 17 beta-hydroxysteroid dehydrogenase and the minor enzyme form to aldehyde reductase.
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357
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Tsujimura T, Zhang YP, Fujio C, Chang HR, Watatani M, Ishizaki K, Kitamura H, Ikenaga M. O6-methylguanine methyltransferase activity and sensitivity of Japanese tumor cell strains to 1-(4-amino-2-methyl-5-pyrimidinyl)methyl-3-(2-chloroethyl)- 3-nitrosourea hydrochloride. Jpn J Cancer Res 1987; 78:1207-15. [PMID: 3121556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Using 40 tumor cell strains derived from various organs of Japanese tumor patients and also 12 normal cell strains, we have measured the activity of O6-methylguanine-DNA methyltransferase (MT), which can repair O6-methylguanine produced in DNA by alkylating agents. Then, the lethal sensitivities of the strains to the anti-tumor drug 1-(4-amino-2-methyl-5-pyrimidinyl)methyl-3-)2-chloroethyl)-3-nitrosourea hydrochloride (ACNU) were measured. The MT activity was assayed by measuring the 3H radioactivity transferred from the substrate DNA containing [methyl-3H]-O6-methylguanine to acceptor molecules in the cell extracts. Extracts from the majority of tumor strains and all normal cell strains contained substantial MT activity of varying degree, while the extracts of 6 tumor strains showed virtually undetectable MT activity. Hence these 6 strains were assigned as Mer-, the phenotype which is characterized by the inability to repair O6-methylguanine in DNA due to the lack of MT. The Mer- tumor strains were much more sensitive to ACNU than the rest of Mer+ strains, as measured by colony-forming ability. Furthermore, with all the tumor and normal strains tested, a good correlation was observed between MT activity and cellular resistance to ACNU. These results indicate that the frequency of Mer- strain is about 15% among Japanese tumor cell strains so far analyzed, and further suggest that MT may be the only system able to repair lethal DNA damage induced by ACNU.
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358
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Ikenaga M, Tsujimura T, Chang HR, Fujio C, Zhang YP, Ishizaki K, Kataoka H, Shima A. Comparative analysis of O6-methylguanine methyltransferase activity and cellular sensitivity to alkylating agents in cell strains derived from a variety of animal species. Mutat Res 1987; 184:161-8. [PMID: 3476849 DOI: 10.1016/0167-8817(87)90073-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Using 26 cultured cell lines derived from 17 different animal species, we have measured both the activity of O6-methylguanine (O6-MeG) methyltransferase (MT) in cell extracts and the sensitivity of the strains to the lethal effects of the alkylating agents, N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) and 1-(4-amino-2-methyl-5-pyrimidinyl)methyl-3-(2-chloroethyl)-3-nitrosourea (ACNU). The MT activity was assayed by measuring the amount of 3H radioactivity transferred from methyl-[3H]-labeled O6-MeG in DNA to acceptor protein molecules in the extracts. In all the 21 mammalian cell strains, lethal sensitivity to ACNU as measured by colony-forming ability correlated well with cellular MT activity, indicating that the major lethal ACNU damage is reparable by the MT. On the other hand, MNNG sensitivity did not necessarily correlate with the MT activity.
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359
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Ishizaki K, Tsujimura T, Fujio C, Zhang YP, Yawata H, Nakabeppu Y, Sekiguchi M, Ikenaga M. Expression of the truncated E. coli O6-methylguanine methyltransferase gene in repair-deficient human cells and restoration of cellular resistance to alkylating agents. Mutat Res 1987; 184:121-8. [PMID: 3627141 DOI: 10.1016/0167-8817(87)90068-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have constructed a truncated E. coli O6-methylguanine methyltransferase (MT) gene (ada gene) to express the MT activity for O6-methylguanine and O4-methylthymine but not for methylphosphotriester in human cells and transferred it into Mer- HeLa MR cells. The transfectant cells expressed the truncated E. coli MT were resistant to alkylating agents as same as the transfectant cells with the intact ada gene in cell killing, sister-chromatid exchange induction and host-cell reactivation of adenovirus 5. These results strongly suggest that methylphosphotriester may not contribute to the biological effect of alkylating agents in human cells.
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360
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Zhang YP. [Affinity of murine IgG subclasses to staphylococcal protein A (SpA)]. WEI SHENG WU XUE BAO = ACTA MICROBIOLOGICA SINICA 1987; 27:290-1. [PMID: 3439161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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361
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Wang CG, Zhang YP, Wu DK. [Microscopic studies on the back scales of nine medicinal snakes]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1987; 12:8-11, 61. [PMID: 3449254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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362
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Zhang YP, Chen YN, Fan GC, Xia SX. [Relationship between radiation sensitization and DNA damage by bimolane]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1987; 8:177-80. [PMID: 2959009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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363
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Fang XM, Zhang YP, Shi YL, Wang WP. [Antagonism of the neuromuscular-blocking effect of polymyxin B by 3,4-diaminopyridine]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1987; 8:22-5. [PMID: 3037854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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364
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Zheng W, Zhang YP. [Research progress on a new potassium channel-blocking agent--4-aminopyridine]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1986; 17:254-8. [PMID: 2432655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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365
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Abegg R, Bandyopadhyay D, Birchall J, Cairns EW, Coombes H, Davis CA, Davison NE, Delheij PP, Green PW, Greeniaus LG, Gubler HP, Healy DC, Lapointe C, Lee WP, McDonald WJ, Miller CA, Moss GA, Plattner GR, Poffenberger PR, Ramsay WD, Roy G, Soukup J, Svenne JP, Tkachuk R, Wait GD, Zhang YP. Test of charge symmetry in neutron-proton elastic scattering at 477 MeV. PHYSICAL REVIEW LETTERS 1986; 56:2571-2574. [PMID: 10033033 DOI: 10.1103/physrevlett.56.2571] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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366
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Zheng W, Zhang YP, Fang RY. [Antidotal effect of 4-aminopyridine on acute poisoning induced by magnesium sulfate]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1986; 7:178-82. [PMID: 2946162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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367
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Wang DW, Xiao GX, Zhang YP. Detection of Bacteroides fragilis and Bacteroides melaninogenicus by indirect immunofluorescence. Chin Med J (Engl) 1985; 98:857-8. [PMID: 2870883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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368
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Li ZX, Tian FJ, Wu XY, Zhang YP, Tian L, Shi S. [Anti-arrhythmic action of total flavones of Choerospondias axillaris fructus]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1984; 5:251-4. [PMID: 6240899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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369
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Zhang YP. [The serotypes of 192 strains of Pseudomonas aeruginosa isolated from burn patients]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1984; 22:459-60, 509. [PMID: 6440760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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370
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Chen GK, Fang RY, Zhang YP. [Pharmacological studies on bisatropinium bromide, a new muscle relaxant]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1984; 19:21-27. [PMID: 6477678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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371
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Shen PL, Qian XM, Zhang YP, Xu JM, Ye JF. [Effect in vitro of metabolized praziquantel on Schistosoma japonicum]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1982; 3:208-10. [PMID: 6216732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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