376
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Liu XY, Li CJ. Effects of sodium salicylate on the febrile response and increased levels of cyclic AMP in cerebrospinal fluid during endogenous pyrogen-induced fever in rabbits. SCIENCE IN CHINA. SERIES B, CHEMISTRY, LIFE SCIENCES & EARTH SCIENCES 1989; 32:1215-23. [PMID: 2553052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
To further evaluate the causality between endogenous pyrogen (EP)-induced fever and cyclic adenosine-3',5'-monophosphate (cyclic AMP) level, the effects of sodium salicylate (SS) on the febrile response and increased levels of cyclic AMP in both cerebrospinal fluid (c.s.f.) and plasma during EP-induced fever in rabbits were observed. The results suggest that cyclic AMP is probably involved in the central mediation of EP-induced fever and that increased concentration of cyclic AMP in c.s.f. associated with EP-induced fever is not the result of temperature elevation but appears to be caused by the increased synthesis in the central nervous system. In addition it is confirmed that blood is impossibly a contributory source of increased cyclic AMP in c.s.f. during EP fever, and that SS may act subsequent to the increase in cyclic AMP.
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377
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Yin GS, Du XQ, Wang GX, Wang XM, Zhang MX, Zhao WZ, Chen Y, Yao MH, Zheng HD, Liu XY. Study on the mechanism of interferon action (XI)--Effect of pppA2'p5'A on the level of cAMP and cGMP in macrophages. SCIENCE IN CHINA. SERIES B, CHEMISTRY, LIFE SCIENCES & EARTH SCIENCES 1989; 32:970-5. [PMID: 2482032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In this paper, the increase of cellular cAMP and cGMP levels in macrophages induced by ppA2'p5' A2'p5'A (briefly 2'-5'P3A3) is first reported. The optimal concentration of 2'-5' P3A3 for the elevation of cellular cGMP to the highest level is 10(-7)-10(-6) mol/L, while that for cAMP is 10(-7) mol/L. The time for cGMP to reach its peak value is 15 min and that for cAMP is 2 h, when the cells are treated with 2'-5' P3A3 at 10(-7) mol/L, which is the optimal concentration for developing biological effect of macrophages (phagocytosis). These results suggest that cGMP and cAMP may be related to, or may be the mediators for, 2'-5'P3A3 action.
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378
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Li SW, Liu XY. Mechanism of interferon action. X--Antagonistic effect of ATP on pppA2'p5'A2'p5'A receptor. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1988; 31:304-12. [PMID: 3413472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
pppA2'p5'A2'p5'A (2'-5'P3A3) receptor may be the first one in the oligonucleotide field. But ATP can compete with 2'-5'P3A3 for the receptor. This raises a question whether this is an ATP receptor. If not, what is the role of ATP for this receptor? Data available in this article show that ATP can bind to macrophages with saturability and reversibility. So ATP appears to be also a ligand of the receptor for 2'-5'P3A3. But the binding of ATP did not develop phagocytic effect as mentioned before. Moreover, ATP inhibited the enhancement of phagocytosis of macrophages by 2'-5'P3A3 when it acted together with 2'-5'P3A3 on macrophages at the same time. It is concluded that ATP is an antagonist of 2'-5'P3A3 receptor. When macrophages were treated with ATP prior to 2'-5'P3A3 and the binding sites for 2'-5'P3A3 were first occupied by ATP, both the binding ability and the binding sites for 2'-5'P3A3 were first occupied by ATP, both the binding ability and the biological effect of 2'-5'P3A3 were all markedly blocked. The above data convincingly show that the action of 2'-5'P3A3 is definitely mediated through its receptor.
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379
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Liu XY, Jung V, Zhao XX, Bhatt RS, Maeda S, Pestka S. Expression of a pseudogene for interferon-alpha L. JOURNAL OF INTERFERON RESEARCH 1987; 7:641-6. [PMID: 3681016 DOI: 10.1089/jir.1987.7.641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The human leukocyte interferon-alpha L (IFN-alpha L) appears to be a pseudogene because it contains a termination codon in the DNA coding for the precursor peptide (signal peptide), but the remainder of the gene codes for an interferon protein of normal length. To determine if this gene codes for an active interferon molecule, an expression plasmid was constructed for IFN-alpha L that was produced in Escherichia coli. The IFN-alpha L is active on human and bovine cells, and exhibits a trace of activity on mouse cells.
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380
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Wang Y, Liu XY, Yang ZW, Wang QW, Xu YZ, Wang QZ, Xu JF. The reaction mechanism of N-benzoylimidazole with ribonucleotides. Nucleic Acids Res 1987; 15:4291-305. [PMID: 3588294 PMCID: PMC340848 DOI: 10.1093/nar/15.10.4291] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The reaction of uridine 3'-phosphate with benzoylimidazole in the absence and presence of a strong base was followed up by 31P and 1H nmr as well as paper electrophoresis. Possible reaction courses were proposed, the reaction rate constants were calculated and the reaction mechanism was discussed. It is possible to selectively acylate ribonucleotides with benzoylimidazole by appropriate choice of the base used.
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381
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Zhang DF, Liu BY, Liu XY, Chen XH. In vitro immunoregulation of anti-HBs synthesis by peripheral lymphocytes in HBV infections. Chin Med J (Engl) 1987; 100:338-42. [PMID: 3115704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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382
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Liu XY, Ge BF, Qiu YY. [Clinical use of the lateral leg flap: report of 4 cases]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1987; 25:224-5, 254. [PMID: 3652878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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383
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Nordlund TM, Liu XY, Sommer JH. Fluorescence polarization decay of tyrosine in lima bean trypsin inhibitor. Proc Natl Acad Sci U S A 1986; 83:8977-81. [PMID: 3466171 PMCID: PMC387057 DOI: 10.1073/pnas.83.23.8977] [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: 01/05/2023] Open
Abstract
The fluorescence of lima bean trypsin inhibitor is due to a single tyrosine residue at position 69. The lifetime of this tyrosine fluorescence is 620 +/- 50 ps (mean +/- SD) and is little affected by addition of 0.88 M citrate, an efficient quencher of tyrosine fluorescence. The steady-state emission intensity is also only weakly reduced by the quencher. The tyrosine is thus not accessible to the citrate and is probably located in the interior of the protein. The high pK of the tyrosine supports this conclusion. The fluorescence anisotropy decay of the inhibitor's tyrosine can be fitted to a double exponential form, with time constants of about 40 ps and greater than or equal to 3 ns. The anisotropy at time zero is 0.19 +/- 0.015 (mean +/- SD), the same as for N-acetyl-L-tyrosinamide in viscous glycerol solution. The nanosecond component of the decay is consistent with rotation of the entire protein molecule. The 40-ps component demonstrates that the tyrosine has considerable freedom to move independently of the protein as a whole. This rotational correlation time is approximately what is observed for free tyrosine in aqueous solution. Since the polypeptide chain near tyrosine-69 is anchored by several disulfide bonds, the data argue that this interior portion of the protein consists of a rigid, immobile backbone embedded in fluid, mobile amino acid side chains.
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384
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Peng RL, Tao Y, Yang XH, Zhang SY, Liu XY. [Preparation and preliminary identification of the monoclonal antibody against esophageal carcinoma]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1986; 8:432-4. [PMID: 3582110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A series of monoclonal antibody against esophageal carcinoma was prepared by ECa109 cells immunizing Balb/c mice. Hybrids secreting antibodies reacting to ECa109 were isolated and further cloned. One monoclonal antibody, 4C3, reacted only to an esophageal cancer cell line, gastric cancer and hepatocellular carcinoma cell lines. Purified 4C3 was used in ELISA test to detect tumor cells in the esophageal epithelial cells obtained by friction balloon. The result showed that the concordance rate to the result of balloon cytosmear was 62.4% (73/117). Patients, diagnosed cytologically as dyskaryosis, were often positive in ELISA test. It is proposed that 4C3 be useful in detecting pre-cancerous lesions.
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385
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Wang Y, Yang ZW, Wang QW, Xu YZ, Liu XY, Xu JF, Chen CH. The role of metaphosphate in the activation of the nucleotide by TPS and DCC in the oligonucleotide synthesis. Nucleic Acids Res 1986; 14:2699-706. [PMID: 3754328 PMCID: PMC339692 DOI: 10.1093/nar/14.6.2699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The course of the activation of 3'-acetylthymidine 5'-phosphate by TPS and DCC were followed up by 31P FT nmr. The fact that the "metaphosphate" (delta-5.1) first becomes detectable only at later stage of the activation and does coexist with pyrophosphate and triphosphate suggests that the pyridinium derivative of "metaphosphate" is most probably not directly formed from the hypothetical mixed anhydride or active "pseudourea" right at the beginning of the reaction of pdTac with TPS or DCC, but rather formed at later stage of the activation reaction from the degradation of the pyro- and triphosphates by the activating agent. The mixed anhydride or the active "pseudourea" is most possibly the active key intermediate.
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386
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Liu XY, Zheng HD, Wang N, Ren WH, Wang TP. Assay of effect of (2'-5')-oligoadenylate on macrophages. Methods Enzymol 1986; 119:676-81. [PMID: 3762415 DOI: 10.1016/0076-6879(86)19090-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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387
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Liu XY, Li BL, Li SW. Measurement of a receptor for (2'-5')-oligoadenylate(trimer) on macrophages. Methods Enzymol 1986; 119:351-6. [PMID: 3531769 DOI: 10.1016/0076-6879(86)19054-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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388
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Li BL, Liu XY. Mechanism of interferon action--structural requirement of ligand and cellular specificity. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1985; 28:844-53. [PMID: 2422754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We had reported the existence of 2'-5'P3A3 receptor on the peritoneal macrophages from Wistar rat. In this paper data are given to demonstrate that the ligand, for binding with 2'-5'P3A3 receptor and enhancing the phagocytosis of macrophages, must have a three-phosphate radical on its 5'-terminus and at least three adenylate residues in 2'-5'oligoadenylate. (3H)-2'-5'P3A3 can also bind on macrophages from other animals; and the binding of (3H)-2'-5'P3A3 on Hepatoma cell line 7402 is lower than that on macrophages; whereas it is very low (binding ratio less than 1%) on erythrocytes (from rabbit, rat and mouse) or human embryo lung fibroblast cells. The binding conditions of the ligand with 2'-5'P3A3 receptor have also been investigated.
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389
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Li BL, Liu XY. Mechanism of interferon action--the discovery of the pppA2'p5'A2'p5'A receptor. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1985; 28:697-706. [PMID: 2422753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In this paper it is demonstrated that (3H)2'-5'P3A3 can bind to the peritoneal macrophages from Wistar rat. This binding is strongly inhibited by cold 2'-5'P3A3, while the inhibiting capacity of 2'-5'P3I3 and 2'-5'A3 is very small, showing that this binding is highly specific. And the binding of (3H)2'-5'P3A3 is reversible, saturable and with high affinity. A Scatchard analysis of the binding data gives a linear plot, an apparent dissociation constant (Kd) about 1.3 X 10(-7) M and binding sites per cell about 2.1 X 10(7). The above evidence shows the existence of the 2'-5'P3A3 receptor, a fact which, to our knowledge, has not been reported before.
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390
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Liu XY, Ge BF. Lymphatic venous shunt in the treatment of postmastectomy lymphedema. Chin Med J (Engl) 1985; 98:65-6. [PMID: 3924501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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391
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Lu CD, Lou YC, Li BL, Wang CY, Liu XY, Wang DB, Hou YD, Zhang ZQ, Yang XK. [Analysis of human leukocyte interferon gene cloned in plasmid p8218]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1984; 6:1-4. [PMID: 6094029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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392
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Liu XY. [Physical growth and intellectual development of 63 full term small-for-date children]. ZHONGHUA YI XUE ZA ZHI 1983; 63:680-2. [PMID: 6426733] [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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393
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Liu XY, Zheng HD, Wang N, Li BL, Ren WH, Kong RL, Wang DB. Mechanism of interferon action. Activation of macrophages and antagonism to alpha-feto-protein by pppA2'p5'A2'p5'A. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1983; 26:1057-64. [PMID: 6197751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
pppA2'p5'A2'p5'A(2'-5'P3A3) activates macrophages and increases the phagocytosis of macrophages from different species including human beings. This indicates that the activation of macrophages may be a general action of 2'-5'P3A3. This discovery broadens the effect of 2'-5'P3A3 beyond the antiviral field. alpha-Feto-protein (AFP) inhibits the phagocytosis of macrophages and may be involved in the development of hepatoma. Data presented here show that 2'-5'P3A3 can antagonize this suppressive effect of AFP. Methods used so far for introducing 2'-5'P3A3 into the cells were made with the aid of CaCl2, etc. under conditions which may not be the same as those used clinically. It was found that 2'-5'P3A3 can develop its biological effect without the aid of CaCl2, etc.
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394
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Liu XY, Yao K, Zhou YX, Jin JR, Wen YM, Lou YC, Li BL, Wang DB. Mechanism of interferon action III--significance of pppA2'p5'A2'p5'A in the antiviral action of interferon. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1983; 26:809-17. [PMID: 6194560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This paper is to evidence that the antiviral effect of pppA2'P5'A2'P5'A(2'-5'P3A3) could cover a wide spectrum of viruses, the RNA viruses such as influenza H3N2/77, influenza H1N1/77, ECHO11, rhino, Sendai, Sindbis and VSV, and the DNA viruses such as herpes (type I). In addition, the antiviral effect of 2'-5'P3A3 on ECHO11 virus, as compared with other viruses, is more efficient than that of IFN. It seems likely that 2'-5'P3A3 plays an important role in the antiviral action of IFN. After comparing the action of 2'-5'P3A3 with interferon (IFN), it has appeared that the action of 2'-5'P3A3 is something parallel to that of IFN for most viruses. For a few viruses, however, considerable differences have been observed.
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395
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Liu XY. [Survey on immune levels against measles among residents of Nanguan District, Changchun City]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1983; 4:176-7. [PMID: 6627367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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396
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Wang DB, Qiu MS, Liang ZH, Zheng KQ, Wu RL, Wang CY, Liu XY, Zheng HD, Bao YD, Zhu XL, Guo LH, Chen YD, Huang JJ, Zhou FY, Chen HB, Xu BZ, Zhang QJ, Hua L, Hu MH. Synthesis of the 3'-half molecule of yeast alanine tRNA. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1983; 26:482-94. [PMID: 6553357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
This paper deals with the synthesis of the 3'-half molecule of yeast alanine transfer RNA (tRNAAlay) by ligation with T4 RNA ligase of three component oligonucleotide fragments corresponding to nucleotides 36-45(I), 46-57(II) and 58-76(III) in succession extending from the 3'-end to the 5'-end. First, in a ratio of acceptor to donor at 1.5 to 1, we adopted a method of three successive reactions, namely, the 5'-phosphorylation of the nonadecamer (III), ligation with the dodecamer (II) and the 5'-phosphorylation of the ligation product formed; with one isolation step and obtained the 5'-phosphorylated 31mer(46-76) (IV) in an overall yield of 70%. Then the 31mer(IV) as a donor was ligated with 3 times of decamer (I) to form the 41mer(36-76) (V), the 3'-half molecule of tRNAAlay. The yield was 67%. After 5'-phosphorylation, (V) was ligated with the natural 5'-half molecule to form the semi-synthetic tRNAAlay, which was biologically active, i.e. accepting and transferring (3H)-alanine into proteins.
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397
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Zhao XX, Hou YD, Su XL, Liu XY. [Biological activities of pppA2'p5'A2'p5'A]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1982; 4:367-71. [PMID: 6303612] [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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398
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Liu XY, Lu SR. [The clinical effects of medical anti-shock trousers on acute upper gastrointestinal tract hemorrhage]. ZHONGHUA YI XUE ZA ZHI 1982; 62:343-5. [PMID: 6812921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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399
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Liu XY. [Survey on hair mercury content of 857 normal persons in Suzhou City (author's transl)]. ZHONGHUA YU FANG YI XUE ZA ZHI [CHINESE JOURNAL OF PREVENTIVE MEDICINE] 1981; 15:310-2. [PMID: 7341115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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400
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Li YY, Liu XY, Shi LY, Li Y, Hou YD. [Induction characteristic of lymphoblastoid interferon (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1980; 2:250-3. [PMID: 6171357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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