351
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Robertson BH, Jia XY, Tian H, Margolis HS, Summers DF, Ehrenfeld E. Antibody response to nonstructural proteins of hepatitis A virus following infection. J Med Virol 1993; 40:76-82. [PMID: 8390561 DOI: 10.1002/jmv.1890400115] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The nonstructural proteins of hepatitis A virus (HAV), produced during active virus replication, are alternative antigens that could be used to differentiate disease from inactivated vaccine-induced antibodies. An assay based on immune precipitation of proteins translated from transcripts of the P2 region of viral cDNA was used to evaluate the development of antibodies after natural infection or vaccination. Antibodies against P2 proteins were found in all sera from clinical cases of hepatitis A following the acute phase. Chimpanzees vaccinated with inactivated or cell-adapted HAV had no detectable antibodies against P2 products, either before or after wild type virus challenge. A serosurvey of sera positive for total anti-HAV (HAVAB, Abbott Laboratories, North Chicago) suggested that some individuals had no detectable antibodies to the P2 antigen by immune precipitation. These results were attributed to the lower sensitivity of the immunoprecipitation assay, since antibodies to capsid proteins, as measured by immunoprecipitation, were also not detected in most of these sera.
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352
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Yao Y, Tian H, Sheng Z, Wang YP, Shi Z, Lan F. The role of endotoxin in the pathogenesis of experimental multiple system organ failure: a preliminary report. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1992; 7:161-5. [PMID: 1286184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In this study, an animal model of multiple system organ failure (MSOF) in rabbits, engendered by feeding E. coli prior to severe hemorrhagic shock, was used for the purpose of investigating 1) the relationship between lipopolysaccharide (LPS) and MSOF, and 2) the effectiveness of Re-LPS antiserum in preventing MSOF. The results showed that endotoxemia occurred very early, and its degree correlated well with that of organ dysfunction. Re-LPS antiserum administration abated the toxic effects and lowered the incidence of MSOF. These results suggest that sequential analysis of circulating LPS levels may be useful for the early diagnosis of MSOF, and that gut-derived endotoxin might play an important role in the pathogenesis of experimental MSOF.
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353
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Hahn AB, Tian H, Wiegand G, Soloski MJ. Signals delivered via the Qa-2 molecule can synergize with limiting anti-CD3-induced signals to cause T lymphocyte activation. Immunol Invest 1992; 21:203-17. [PMID: 1350269 DOI: 10.3109/08820139209072259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Qa-2 is a glycolipid anchored, MHC encoded class I molecule expressed at high levels on all murine peripheral T lymphocytes. Anti-Qa-2 antibodies have previously been found to stimulate T cells to proliferate in the presence of crosslinking antibody and PMA. We have examined the effect of anti-Qa-2 antibodies on T cells stimulated with a suboptimal concentration of immobilized anti-CD3. When anti-Qa-2 antibodies were co-immobilized with limiting anti-CD3, in the absence of PMA, a clear augmentation of T cell proliferation was seen. Interestingly, the co-stimulatory anti-Qa-2 antibodies could be directed against epitopes mapped to either the alpha 3 or the alpha 1/alpha 2 Qa-2 domains. As was the case with activation induced by soluble/crosslinked anti-Qa-2 antibodies plus PMA, CD8+ T cells were less able to be costimulated with anti-Qa-2 antibodies than CD4+ cells. Surprisingly, Ca2+ mobilization was only seen when two anti-Qa-2 antibodies reactive to separate structural domains were co-crosslinked on the surface of Indo-1 loaded T cells with a suboptimal concentration of anti-CD3. Collectively these results raise questions regarding the mechanism of Qa-2 mediated signaling and its potential role in T cell activation.
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354
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Fu X, Tian H, Sheng Z, Wang D. Multiple organ injuries after abdominal high energy wounding in animals and the protective effect of antioxidants. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1992; 7:86-91. [PMID: 1450398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Multiple organ injuries caused by high energy abdominal wounds were studied in 8 pigs and 24 dogs, and at the same time the protective effect of antioxidants in 14 dogs with multiple organ injuries was also studied. The experimental results showed that: 1) more than two organs (six organs at most) were wounded in each of the animals studied; 2) the injuries were characterized by hemorrhaging, tissue rupture and hematoma, and the main pathologic changes were local edema and necrosis; 3) the marked increase of lipid peroxide (LPO) levels in the vital organs indicated that multiple organ injuries could also involve the molecular level; 4) the injuries were due to the direct effect of pressure waves and ischemic reperfusion and not to shock or infection; and 5) antioxidants (vitamin E and Salvia miltiorrhiza Bge.) exhibited significant protective effects against multiple organ injuries through a free radical mechanism.
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355
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Cohen DI, Tani Y, Tian H, Boone E, Samelson LE, Lane HC. Participation of tyrosine phosphorylation in the cytopathic effect of human immunodeficiency virus-1. Science 1992; 256:542-5. [PMID: 1570514 DOI: 10.1126/science.1570514] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Protein tyrosine phosphorylation is a common mechanism of signaling in pathways that regulate T cell receptor-mediated cell activation, cell proliferation, and the cell cycle. Because human immunodeficiency virus (HIV) is though to affect normal cell signaling, tyrosine phosphorylation may be associated with HIV cytopathicity. In both HIV-infected cells and transfected cells that stably express HIV envelope glycoproteins undergoing HIVgp41-induced cell fusion, a 30-kilodalton protein was phosphorylated on tyrosine with kinetics similar to those of syncytium formation and cell death. When tyrosine phosphorylation was inhibited by the protein tyrosine kinase inhibitor herbimycin A, envelope-mediated syncytium formation was coordinately reduced. These studies show that specific intracellular signals, which apparently participate in cytopathicity, are generated by HIV and suggest strategies by which the fusion process might be interrupted.
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356
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Yang LP, Wen ZY, Yu GQ, Tian H. [On the relation between substance P and physostigmine on cardiovascular control in rabbit brain]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1992; 44:192-6. [PMID: 1377837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Using an electromagnetic flowmeter technique, the cardiac output as measured by blood flow in the aortic arch was measured during intracerebroventricular injection (icv.) of Substance P (SP) and physostigmine in 47 anesthetized rabbits. Carotid artery blood pressure and heart rate were recorded. After icv of SP (20 micrograms/20 microliters) or physostigmine (60 micrograms/20 microliters), both cardiac output and mean artery pressure were increased. Pretreatment with icv. of atropine (150 micrograms/20 microliters) did not alter the effect of SP, but the effect of physostigmine was blocked by pretreatment with SP blocker (25 micrograms/20 microliters). These findings suggest that cerebral SP is involved in cholinergic mechanisms on the central control of blood pressure.
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357
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Tian H, Liang J, Ma X, Yu T, Yang L, Qui D. [The variations of PRL, LH, FSH and testosterone in renal disease]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1992; 23:94-7. [PMID: 1398636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Blood PRL was measured with RIA in 22 males and 19 females with various degrees of renal insufficiency. At the same time, blood LH, FSH, testosterone were studied in all the male patients and 20 sex-age matched healthy subjects. The results showed that the levels of PRL and LH were increased, and the level of testosterone was decreased significantly in male uremic patients. There was a significant negative correlation between PRL and testosterone. All the above parameters were measured again 8-25 days after continuous ambulatory peritoneal dialysis (CAPD) therapy in 5 male uremic patients. The BUN and Cr levels decreased and the clinical manifestations of uremia improved, but the levels of PRL, LH, FSH and testosterone showed no significant changes. The mechanisms of these variations were discussed.
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358
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Robertson BH, Jia XY, Tian H, Margolis HS, Summers DF, Ehrenfeld E. Serological approaches to distinguish immune response to hepatitis A vaccine and natural infection. Vaccine 1992; 10 Suppl 1:S106-9. [PMID: 1335637 DOI: 10.1016/0264-410x(92)90559-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Currently, the immune status of an individual exposed to hepatitis A virus (HAV) is determined by assays which measure antibodies against the capsid proteins. These assays indicate exposure to the viral capsid that could result from either infection or from vaccination. Recent data indicate that proteins from the non-structural genome region of the virus (P2 or P3), which are only produced during active virus replication, generate antibodies after clinical disease. A sub-genomic cDNA segment of HAV corresponding to the P2 region was used for in vitro transcription-translation followed by immune precipitation of the translated products under non-denaturing conditions. Serial serum specimens from experimentally infected chimpanzees and humans naturally infected with hepatitis A verified the development of antibodies to P2 proteins following infection. A serosurvey of individuals positive for antibodies to the HAV capsid (HAV AB assay, Abbott Laboratories) revealed that 50-60% of children and 16-32% of adults had no detectable antibodies to the P2 antigen by immune precipitation. These results may reflect subclinical infections resulting in a lower level of antibodies against the non-structural antigens or may represent a greater sensitivity of the competitive assay (HAV AB) used to detect capsid antibodies compared to the immunoprecipitation assay used to detect non-structural antigens.
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359
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Woolard DL, Tian H, Trew RJ, Littlejohn MA, Kim KW. Hydrodynamic electron-transport model: Nonparabolic corrections to the streaming terms. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:11119-11132. [PMID: 9999232 DOI: 10.1103/physrevb.44.11119] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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360
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Tian H, Imani F, Soloski MJ. Physical and molecular genetic analysis of Qa-2 antigen expression: multiple factors controlling cell surface levels. Mol Immunol 1991; 28:845-54. [PMID: 1715028 DOI: 10.1016/0161-5890(91)90048-o] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We have examined the surface expression of Qa-2 on lymphocyte subpopulations and on splenocytes from inbred mouse strains by a radioactive binding assay using purified anti-Qa-2 antibodies and antibody fragments (Fab). Quantitative measurements by Scatchard analysis revealed that spleen cells from Qa-2high mice express (4-5) x 10(4) Qa-2 molecules/cell, whereas T lymphocytes have as high as (7-8) x 10(4) molecules/cell. In addition, it was determined that B lymphocytes express (5-6) x 10(3) molecules on their cell surface. The Qa-2 levels on anti-CD3-activated T cells is 1.0 x 10(5) molecules/cell. Previous experiments have shown that the quantity of Qa-2 varies in a strain-specific fashion and may be classified into three groups: Qa-2high, Qa-2medium and Qa-2low. Our results indicated that Qa-2high strains express (4-5) x 10(4) Qa-2 molecules/cell, Qa-2medium strains (B6-K2, B10.A, A/J, BALB/c and DBA/2) express (1-1.7) x 10(4) molecules/cell, and Qa-2low strains (SWR/J and DBA/1) express no more than 6 x 10(3) molecules/cell. Detection of Q7 or Q9 mRNA by the polymerase chain reaction revealed that Qa-2high strains express two functional Qa-2 enconding genes, Q7 and Q9, whereas Qa-2medium and Qa-2low strains express either Q7 or Q9. These results strongly suggest that Qa-2 gene dosage contributes in part to the variation of Qa-2 levels on the cell surface.
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361
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Tian H, Song Z, Lu Y. [Quantitative analysis of calcium bilirubin in calculus bovis by infrared spectrometry]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:293-5, 319. [PMID: 1781898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This paper reports the method of quantitative analysis of calcium bilirubin in calculus bovis by infrared spectrometry. This method is simple and quick, requiring no separation and only small amount of sample, not destroying the sample and having few interferences.
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362
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Tian H, Liang J, Zhang X. [Malondialdehyde-modified-low density lipoprotein in diabetes mellitus]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1991; 22:97-9. [PMID: 1774047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Malondialdehyde-modified-low density lipoprotein (MDA-LDL), lipid peroxide (LPO), lipid and fasting blood glucose (FBG) were studied in 42 diabetic patients and 20 age-matched controls. The results revealed that both MDA-LDL per L serum and MDA-LDL per mol LDL-C of diabetics were higher than those of controls. MDA-LDL/L tended to be much higher in diabetic patients with vascular disease and hyperlipidemia. There was a positive correlation between MDA-LDL/L and LPO, LDL-C, TC, respectively.
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363
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Tian H, Lian J, Zhang X. [Glycosylated hemoglobin in the diagnosis of diabetes mellitus]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1990; 21:197-200. [PMID: 2391104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Blood glucose at fasting and 1, 2, and 3 hours after meals GHb (glycosylated hemoglobin) were determined in 66 subjects. Based on WHO criterion, 34 of them were diabetics, and 32 were nondiabetics, in whom impairing of glucose tolerance (IGT) and diabetes were ruled out. The results showed that the concentrations of blood glucose, at fasting, and 1, 2, and 3 hours after meals, blood glucose area, and GHb in diabetic patients were significantly higher than those in the controls. There was a significant positive correlation between GHb and blood glucose at fasting and 2 hours after meal, and between GHb and blood glucose area in all subjects. Relative sensitivity of GHb for detecting diabetes mellitus was 88%, and relative specificity was 93.75%.
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364
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Zhao D, Zhang X, Zhou F, Wei Z, Tian H. [Relation of Fourier transform infrared spectroscopic characteristics of pilose antler and its traditional quality grade]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1990; 15:37-9, 63. [PMID: 2350425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The relationship between FTIR characteristics of Pilose Antler and its traditional quality grade was studied and a rule governing its quality value "Z" was found. We have thus advanced a new objective target for preparing Pilose Antler tablets and powder.
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365
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Zhao DY, Wei ZK, Tian H. [Studies on calculus bovis by FTIR-PAS]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1989; 14:34-6, 63. [PMID: 2504204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This article reports the characteristics of different colour layers of Calculus Bovis by FTIR-PAS. It is unnecessary to treat the sample before analysis, and the sample can be reused after analysis. The method is fast accurate and easy to operate.
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366
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Qian B, Sun Z, Wu C, Tian H. Thermal Analysis of Fibers - Part II: A Study on the Shrinkage Modulus and Relaxation Modulus of Fibers by Thermomechanical Analysis. JOURNAL OF POLYMER ENGINEERING 1987. [DOI: 10.1515/polyeng.1987.7.2.87] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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367
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Qian B, Yang P, Tian H, Hu P. The thermal analysis of fibers Part I. The thermomechanical behavior of acrylic fibers. JOURNAL OF POLYMER ENGINEERING 1985. [DOI: 10.1515/polyeng.1985.5.1.65] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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