951
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Min AD, Goeser T, Liu R, Campbell CG, Novikoff PM, Wolkoff AW. Organic anion transport in HepG2 cells: absence of the high-affinity, chloride-dependent transporter. Hepatology 1991; 14:1217-23. [PMID: 1660021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
In previous studies, we identified a 55 kD organic anion-binding protein in liver cell sinusoidal plasma membrane subfractions. Other investigators identified another 55 kD bromosulfophthalein/bilirubin binding protein on the surface of rat hepatocytes and HepG2 cells and suggested that this protein served as a transporter for these ligands. In this study, transport of 35S-sulfobromophthalein by the human hepatoma cell line, HepG2, was quantified in the presence and absence of bovine serum albumin to further clarify the possible function of these plasma membrane binding proteins. In contrast to results in normal rat hepatocytes, virtually no uptake of 35S-sulfobromophthalein by HepG2 cells in the presence of bovine serum albumin was found. In the absence of albumin, HepG2 cells expressed temperature-dependent uptake of 35S-sulfobromophthalein. However, the high-affinity Cl(-)-dependent sulfobromophthalein transport that characterizes normal rat hepatocytes was absent, as indicated by an approximately 95-fold lower affinity and 170-fold higher capacity of HepG2 cells for sulfobromophthalein compared with previous results with rat hepatocytes. These results suggest that 55 kD sulfobromophthalein/bilirubin-binding protein on the liver cell surface differs from organic anion-binding protein and is not responsible for sulfobromophthalein extraction in the presence of albumin, although it may play some role in lower affinity transport by cells. Immunoblot analysis and metabolic labeling of HepG2 cells demonstrated synthesis of organic anion-binding protein. However, light microscopic immunocytochemistry and immunoprecipitation of surface iodinated rat hepatocytes and HepG2 cells with antibody to a recombinant organic anion-binding protein fusion protein indicated absence of organic anion-binding protein on the surface of HepG2 cells.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- A D Min
- Liver Research Center, Albert Einstein College of Medicine, Bronx, New York 10461
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952
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Affiliation(s)
- B Zhang
- Department of Internal Medicine, Fukuoka University School of Medicine, Japan
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953
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Heyen ET, Liu R, Cardona M, Piol S, Melville RJ, Paul DM, Morán E, Alario-Franco MA. Phonon anomalies and structural stability in the R2-xCexCuO4 system (R=Gd,Sm,Nd,Pr). Phys Rev B Condens Matter 1991; 43:2857-2865. [PMID: 9997585 DOI: 10.1103/physrevb.43.2857] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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954
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Alberts DS, Dorr RT, Wunz TP, Remers WA, Einspahr J, Liu R, Salmon SE. In vitro cytotoxicity against fresh human tumors and P388 leukemia predicts the differential in vivo activity of a series of anthracene anticancer drugs. Anticancer Drugs 1991; 2:69-77. [PMID: 1958855 DOI: 10.1097/00001813-199102000-00010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To date, random anticancer drug screening has proven to be relatively inefficient and non-specific with respect to selecting active compounds for most tumor types (except for leukemia/lymphoma). Although large numbers of compounds from diverse sources were evaluated for many years in the P388 mouse leukemia model, only a few clinically useful drugs have been identified by this in vivo screening method. Thus, there is intense interest in the development of more effective in vitro screening models for new anticancer drugs. In the present paper we have compared the discriminating power for fresh human tumors from patients, human tumor cell lines developed from 11 patients and murine P388 leukemia in tumor colony forming assays as indicators of cytotoxicity for a series of anthracene antitumor agents. Two of a series of 21 novel bisantrene analogs, R6 (N,N1-bis[2-(dimethylamino)ethyl]-9,10-anthracene-bis(methylamine)) and R26 (N,N1-bis(1-ethyl-3-piperidinyl)-9,10-anthracene-bis(methylamine] produced significant cytotoxicity against the 11 human tumor cell lines and were therefore selected for additional in vitro and in vivo studies. R26 was specifically selected for further testing since it had similar in vitro potency as mitoxantrone, but showed no cross-resistance against mitoxantrone-resistant WiDr colon or doxorubicin-resistant 8226 myeloma cell lines. In contrast to the cell line data, only of the 22 fresh human tumors showed significant in vitro sensitivity (i.e. less than 50% survival of tumor colony forming units) to either R6 or R26 tested at high concentrations.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D S Alberts
- Department of Medicine, College of Medicine, University of Arizona, Tucson 85724
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955
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Heyen ET, Rashkeev SN, Mazin II, Andersen OK, Liu R, Cardona M, Jepsen O. Resonant Raman scattering in YBa2Cu3O7: Band theory and experiment. Phys Rev Lett 1990; 65:3048-3051. [PMID: 10042766 DOI: 10.1103/physrevlett.65.3048] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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956
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Wang XC, Liu XM, Tan CZ, Liu R, Luo SL, Yue XH, Qin F, Bu ZR, Tian X, Song DY. Epidemic non-A, non-B hepatitis in Xinjiang. Clinical and pathologic observations. Chin Med J (Engl) 1990; 103:890-8. [PMID: 2125910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
131 cases of epidemic hepatitis from two villages in Xinjiang, were admitted to the provisional infectious diseases hospital from February to April 1987. In 125 (95%) patients neither anti-HAV IgM nor anti-HBc IgM were positive. 118 (90%) were drinking water from a local stream of the Hotan River. The study was conducted on 125 patients aged from 5 to 90 years, with a mean of 26.4 years. There were slightly more males than females, a ratio of 1.5 to 1. The incubation period was roughly estimated to be 17 to 37 days (mean 24.8 days). All subjects were jaundiced. 12 patients (including 6 pregnant women) had cholestatic symptoms. Except one woman who died of postpartum bleeding, all patients ran a benign course without fulminant hepatic failure. Pathologic changes of liver biopsies from 35 cases included lobular damage and inflammation, ballooned hepatocytes with clear cytoplasm and delineated cell membrane which were named "clear cell". There were cholestasis of different degrees in the acute icteric stage and fatty changes in the convalescent stage. It was seen under the electron microscope that the livers of 8 cases had neither tubular structure nor sponge-like inclusions, but had nuclear changes including curled edge of nuclear membrane and nuclear heterochromatin condensed in masses. Liver biopsies were repeated in 7 cases followed up for 6-13 months, and hepatohistology was normal in 5. Of the other two cases there was one of each.
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Affiliation(s)
- X C Wang
- Department of Infectious Diseases, PLA No. 376 Hospital, Urumqi
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957
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Olson CG, Liu R, Lynch DW, List RS, Arko AJ, Veal BW, Chang YC, Jiang PZ, Paulikas AP. High-resolution angle-resolved photoemission study of the Fermi surface and the normal-state electronic structure of Bi2Sr2CaCu2O8. Phys Rev B Condens Matter 1990; 42:381-386. [PMID: 9994550 DOI: 10.1103/physrevb.42.381] [Citation(s) in RCA: 218] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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958
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Heyen ET, Liu R, Thomsen C, Kremer R, Cardona M, Karpinski J, Kaldis E, Rusiecki S. Optical phonons in YBa2Cu4O8 and Y2Ba4Cu7O15- delta. Phys Rev B Condens Matter 1990; 41:11058-11067. [PMID: 9993524 DOI: 10.1103/physrevb.41.11058] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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959
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Shi YF, Liu R, Bao XL, Deng JY, Gunnarsson R. Clinical trial with somatonorm in idiopathic growth hormone deficiency in children. Chin Med J (Engl) 1990; 103:470-7. [PMID: 2119959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
This article reports the efficacy and safety of treatment with Somatonorm in 9 children with idiopathic growth hormone (GH) deficiency in China. The growth velocity increased from 2.6 +/- 0.2 cm/year before treatment to 10.7 +/- 0.5 cm/year at the end of 1-year treatment. The increment of human growth hormone (hGH) level and area under the response curve above the baseline level were larger after one injection of Somatonorm at the dose of 0.1 IU/kg sc than that of 0.17 IU/kg im. Increments of delayed bone age were not significant. There was no correlation between the increase of height growth velocities and the serum Somatomedin-C (SMC) levels during hGH therapy (r = -0.055). Blood sugar levels and blood alkaline phosphatase concentrations increased significantly after therapy. There were no significant side effects. Serum T4 levels of 3 patients dropped below normal after treatment. Serum anti-hGH antibody appeared at 3-12 month in 2 patients, but it did not attenuate the growth velocity.
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Affiliation(s)
- Y F Shi
- Department of Endocrinology, PUMC Hospital, Beijing
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960
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Abstract
The soft agar clonogenic assay using [3H]thymidine uptake as an endpoint was adapted for the detection of human LAK activity against the Daudi lymphoma cell line and human tumor cells obtained by biopsy. Using Daudi cells as the target population the modified agar assay was more sensitive than the conventional 4 h 51Cr release assay. Use of a single layer agar assay allowed the assessment of LAK cytotoxic/cytostatic activity against Daudi lymphoma cells after cell to cell contact, while a two layer system permitted evaluation of the role of soluble mediators in LAK/target cell interactions. This study shows that LAK cells can either kill or inhibit the proliferation of Daudi cells by two mechanisms: one which requires cell-to-cell contact, and a second via soluble mediators. As determined by the use of neutralizing antisera, the soluble factor(s) are not tumor necrosis factor and interferon-gamma. Of the nine individual human tumor samples obtained by biopsy. 89% were sensitive to allogeneic LAK cells when the two populations were admixed. Of these nine tumors 44% were inhibited by LAK-derived soluble factors. The soft agar assay system should serve as a useful tool for determining the sensitivity of human tumors to LAK cells and for studying the mechanisms of LAK anti-tumor activity.
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Affiliation(s)
- P Scuderi
- Arizona Cancer Center, University of Arizona College of Medicine, Tucson
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961
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Gunnarsson O, Allen JW, Jepsen O, Fujiwara T, Andersen OK, Olsen CG, Maple MB, Kang J, Liu LZ, Park J, Anderson RO, Ellis WP, Liu R, Markert JT, Dalichaouch Y, Shen Z, Lindberg PA, Wells BO, Dessau DS, Borg A, Lindau I, Spicer WE. Polarized resonance photoemission for Nd2CuO4. Phys Rev B Condens Matter 1990; 41:4811-4814. [PMID: 9994326 DOI: 10.1103/physrevb.41.4811] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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962
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963
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Allen JW, Olson CG, Maple MB, Kang J, Liu LZ, Park J, Anderson RO, Ellis WP, Markert JT, Dalichaouch Y, Liu R. Resonant photoemission study of Nd2-xCexCuO4-y: Nature of electronic states near the Fermi level. Phys Rev Lett 1990; 64:595-598. [PMID: 10042024 DOI: 10.1103/physrevlett.64.595] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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964
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Heyen ET, Liu R, Garriga M, Gegenheimer B, Thomsen C, Cardona M. Resonant Raman scattering in the Pb2Sr2(Y,Ca)Cu3O8+ delta superconductor. Phys Rev B Condens Matter 1990; 41:830-833. [PMID: 9992835 DOI: 10.1103/physrevb.41.830] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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965
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Kim B, Hong S, Liu R, Lynch DW. Angle-resolved inverse photoemission from the Ag(100) surface. Phys Rev B Condens Matter 1989; 40:10238-10240. [PMID: 9991568 DOI: 10.1103/physrevb.40.10238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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966
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Abstract
Solid tumor biopsies from 33 patients were tested in vitro to evaluate the growth modulatory effects of recombinant human granulocyte-macrophage colony-stimulating factor (GM-CSF). In 29 of 33 studies (88%), addition of GM-CSF either had no effect on in vitro growth, or induced growth inhibition. While significant growth inhibition was observed in 10 studies, marked inhibition was only observed in three studies. However, all dose-response curves were usually flat, suggesting indirect effects. Moderate growth stimulation was observed in four instances, which may have been due to residual granulocyte-macrophage progenitors within the biopsies. We conclude that GM-CSF has little or no growth-modulatory effect on most nonhematopoietic neoplasms. The primary role of GM-CSF in patients with solid tumors appears to be in prevention or reversal of myelosuppression associated with therapy. Thus, while GM-CSF seems unlikely to have a role in monotherapy of cancer, it is also unlikely to have its utility compromised by enhancement of tumor growth.
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Affiliation(s)
- S E Salmon
- Department of Internal Medicine, University of Arizona College of Medicine, Tucson 85724
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967
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Olson CG, Liu R, Yang AB, Lynch DW, Arko AJ, List RS, Veal BW, Chang YC, Jiang PZ, Paulikas AP. Superconducting Gap in Bi-Sr-Ca-Cu-O by High-Resolution Angle-Resolved Photoelectron Spectroscopy. Science 1989; 245:731-3. [PMID: 17791711 DOI: 10.1126/science.245.4919.731] [Citation(s) in RCA: 354] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Detailed studies indicate a superconducting gap in the high-temperature superconductor Bi(2)Sr(2)CaCu(2)O(8). Photoemission measurements with high energy and angle resolution isolate the behavior of a single band as it crosses the Fermi level in both the normal and superconducting states, giving support to the Fermi liquid picture. The magnitude of the gap is 24 millielectron volts.
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968
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Arko AJ, List RS, Bartlett RJ, Cheong S, Fisk Z, Thompson JD, Olson CG, Yang A, Liu R, Gu C, Veal BW, Liu JZ, Paulikas AP, Vandervoort K, Claus H, Campuzano JC, Schirber JE, Shinn ND. Large, dispersive photoelectron Fermi edge and the electronic structure of YBa2Cu3O6.9 single crystals measured at 20 K. Phys Rev B Condens Matter 1989; 40:2268-2277. [PMID: 9992108 DOI: 10.1103/physrevb.40.2268] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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969
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Liu R, Cardona M, Gegenheimer B, Heyen ET, Thomsen C. Raman scattering spectra of a superconducting Pb2Sr2Y0.75Ca0.25Cu3O8+ delta single crystal. Phys Rev B Condens Matter 1989; 40:2654-2657. [PMID: 9992179 DOI: 10.1103/physrevb.40.2654] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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970
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Liu R, Olson CG, Yang A, Gu C, Lynch DW, Arko AJ, List RS, Bartlett RJ, Veal BW, Liu JZ, Paulikas AP, Vandervoort K. Ba 4d core-level spectroscopy in the YBa2Cu3O6.9 high-Tc superconductor: Existence of a surface-shifted component. Phys Rev B Condens Matter 1989; 40:2650-2653. [PMID: 9992178 DOI: 10.1103/physrevb.40.2650] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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971
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Xu MJ, Alberts DS, Liu R, Leibovitz A, Liu Y. In vitro evaluation of cisplatin interaction with doxorubicin or 4-hydroperoxycyclophosphamide against human gynecologic cancer cell lines. Cancer Chemother Pharmacol 1989; 25:89-94. [PMID: 2598404 DOI: 10.1007/bf00692345] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Doxorubicin, cisplatin, and cyclophosphamide are the three drugs most commonly used in the treatment of ovarian cancer, but no effect greater than additivity was observed for any combination of these drugs in the present study. Only a few studies have been reported concerning the degree of their additivity or their best order of sequencing. In our in vitro studies, cisplatin in combination with doxorubicin or 4-hydroperoxycyclophosphamide (4HC) was tested against seven human gynecologic tumor-cell lines in different sequences, using a double-agar layer tissue-culture system. Drug interactions with respect to inhibition of tumor clonogenicity were evaluated by isobologram and fractional survival methods. Doxorubicin and 4HC were sequenced simultaneously and at 1, 6 and 24 h after cisplatin, and cisplatin was sequenced at 1, 6 and 24 h after 4HC. The isobolograms constructed for doxorubicin or 4HC plus cisplatin revealed strict additivity between these agents against ovarian cancer clonogenicity. Both doxorubicin and 4HC showed the greatest additivity when used simultaneously and at 1 h vs 6 or 24 h after cisplatin. Although the mechanisms by which these sequencing effects occur are unknown, these studies provide new leads for the design of clinical trials with combinations of these three agents.
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Affiliation(s)
- M J Xu
- Department of Medicine, College of Medicine, University of Arizona, Tucson 85724
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972
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Ruf T, Thomsen C, Liu R, Cardona M. Raman study of the phonon anomaly in single-crystal YBa2Cu3O7- delta in the presence of a magnetic field. Phys Rev B Condens Matter 1988; 38:11985-11987. [PMID: 9946121 DOI: 10.1103/physrevb.38.11985] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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973
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Wallington TJ, Dagaut P, Liu R, Kurylo MJ. Gas-phase reactions of hydroxyl radicals with the fuel additives methyl tert-butyl ether and tert-butyl alcohol over the temperature range 240-440 K. Environ Sci Technol 1988; 22:842-844. [PMID: 22195672 DOI: 10.1021/es00172a017] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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974
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Thomsen C, Cardona M, Gegenheimer B, Liu R, Simon A. Untwinned single crystals of YBa2Cu3O7- delta : An optical investigation of the a-b anisotropy. Phys Rev B Condens Matter 1988; 37:9860-9863. [PMID: 9944401 DOI: 10.1103/physrevb.37.9860] [Citation(s) in RCA: 115] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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975
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Liu R, Thomsen C, Kress W, Cardona M, Gegenheimer B, Prade J, Kulkarni AD, Schröder U. Frequencies, eigenvectors, and single-crystal selection rules of k=0 phonons in YBa2Cu3O7- delta : Theory and experiment. Phys Rev B Condens Matter 1988; 37:7971-7974. [PMID: 9944125 DOI: 10.1103/physrevb.37.7971] [Citation(s) in RCA: 116] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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976
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977
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Abstract
Amdinocillin was studied alone and in combination with three other beta-lactam antibiotics (aztreonam, cefoperazone, and ceftriaxone) for activity against gram-negative bacilli. These antibiotic combinations failed to show synergy by the checker-board double-dilution test or by killing kinetic studies. However, amdinocillin did show additive killing action when combined with the other beta-lactam antibiotics studied. Amdinocillin failed to induce or inhibit beta-lactamase production in species of Enterobacteriaceae, but with Pseudomonas aeruginosa, beta-lactamase production was induced. It is concluded that the activity of amdinocillin alone or in combination with another beta-lactam antibiotic should not be more effective in the treatment of infections by gram-negative bacilli than just using the beta-lactam antibiotic alone at a higher dose.
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Affiliation(s)
- R H Eng
- Veterans Administration Medical Center, East Orange, N.J
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978
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Whiting PJ, Liu R, Morley BJ, Lindstrom JM. Structurally different neuronal nicotinic acetylcholine receptor subtypes purified and characterized using monoclonal antibodies. J Neurosci 1987; 7:4005-16. [PMID: 3694260 PMCID: PMC6569086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Acetylcholine receptors that bind nicotine with high affinity but do not bind alpha-bungarotoxin have recently been immunoaffinity purified from brains of chickens and rats (Whiting and Lindstrom, 1986a, b; Whiting and Lindstrom, 1987a). Antisera to these receptors bind to the nicotinic receptors that regulate cation channel opening on chick ciliary ganglion neurons (Stollberg et al., 1986) and rat PC12 cells (Whiting et al., 1987c). Here we report the preparation and characterization of monoclonal antibodies to chicken brain acetylcholine receptors. These monoclonal antibodies are used to identify 2 nicotinic receptor subtypes in the chicken brain. The 2 subtypes have very similar affinities for nicotine and other cholinergic agonists and antagonists. However, they are structurally distinct, having very similar or identical alpha subunits (Mr 49,000), but different beta subunits (Mr 59,000, or for beta' subunit, Mr 75,000). Evidence is presented that suggests that the subunit stoichiometry of these neuronal nicotinic acetylcholine receptors is alpha n = 2 - 3 beta n = 2 - 3. Different levels of receptor subtype expression were detected in embryonic, compared to adult, chicken brain.
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Affiliation(s)
- P J Whiting
- Salk Institute for Biological Studies, San Diego, California 92138
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979
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Liu R. [A preliminary observation on real-time ultrasonography of bone and joint diseases]. Zhonghua Fang She Xue Za Zhi 1987; 21:75-8. [PMID: 2961525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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980
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Liu R. [Investigation of gastro-intestinal lesions by real-time ultrasonography]. Zhonghua Fang She Xue Za Zhi 1986; 20:335-9. [PMID: 2953568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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981
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Liu R. [Evaluation of ultrasonography in the diagnosis of intrathoracic mass lesions: an analysis of 82 pathologically proved cases]. Zhonghua Fang She Xue Za Zhi 1986; 20:75-8. [PMID: 2942362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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982
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Profeta S, Forrester C, Eng RH, Liu R, Johnson E, Palinkas R, Smith SM. Salmonella infections in patients with acquired immunodeficiency syndrome. Arch Intern Med 1985; 145:670-2. [PMID: 3885890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Salmonella infections occurred in six patients with acquired immunodeficiency syndrome (AIDS) and one patient with probable AIDS. The immune system defects increase the susceptibility of patients with AIDS to salmonella infections. Recognition of salmonellosis in patients with AIDS is important because of a high propensity of this organism to invade the bloodstreams of these patients, and because, unlike other infections in patients with AIDS, this infection can be easily treated.
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983
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Abstract
The afferent and efferent connections of the dorsal tegmental nucleus (DTN) were studied in the rat using axoplasmic transport techniques. Horseradish peroxidase (HRP) and Fast Blue were injected stereotaxically into either pars centralis or pars ventromedialis of the DTN, two subdivisions of the nucleus with distinctive connections. The pars centralis is reciprocally connected with the ipsilateral lateral mammillary and interpeduncular nuclei; these projections constitute the major afferent and efferent systems of the DTN. Commissural fibers from the corresponding pars centralis and intrinsic fibers systems are massive and form a complex fiber meshwork within the subnucleus. The prepositus hypoglossi nucleus (ipsilateral) and supragenualis nuclei (bilateral) also project to the pars centralis. Smaller numbers of afferent fibers arise from the lateral habenular nucleus, the posterior hypothalamus and the brainstem reticular formation. The pars ventromedialis of the DTN receives diverse inputs which include the septal nuclei, diagonal band of Broca, preoptic area, anterior and lateral hypothalamus, lateral and medial habenular nuclei, medial mammillary nucleus and many nuclei of the brainstem reticular formation. Based on the differences of connections and cytoarchitecture between the pars centralis and the pars ventromedialis, the pars ventromedialis may be an entity separate from the dorsal tegmental nucleus.
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984
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Salmon SE, Young L, Soehnlen B, Liu R. Antitumor activity of esorubicin in human tumor clonogenic assay with comparisons to doxorubicin. J Clin Oncol 1984; 2:282-6. [PMID: 6707716 DOI: 10.1200/jco.1984.2.4.282] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The new anthracycline analog, esorubicin (4'deoxy-doxorubicin, ESO), was tested against fresh biopsies of human solid tumors in vitro in clonogenic assay and the results were contrasted to those obtained with doxorubicin (DOX). ESO appeared to be significantly more potent on a weight basis than DOX in these studies, and exhibited a spectrum of antitumor activity in vitro that was in general qualitatively similar to that observed with DOX. In vitro antitumor activity was observed in a wide variety of human cancers including anthracycline-sensitive tumor types. ESO has previously been reported to have decreased cardiac toxicity in preclinical models as compared to DOX. Comparative testing of these anthracyclines on granulocyte-macrophage colony-forming units (GM-CFUs) and tumor colony forming units (TCFUs) indicated that the in vitro GM-CFU assay is more sensitive to these myelosuppressive drugs than are TCFUs, and underscores the need for in vivo studies to determine normal tissue toxicity and the therapeutic index of a drug. Early results of phase I studies suggest that with respect to myelosuppression, the maximally tolerated dose of ESO will be about half that of DOX. The increased in vitro antitumor potency observed for ESO and a spectrum of activity (even at one half the dose of DOX) supports the broad testing of ESO in the clinic to determine whether it will prove to be a more effective and less toxic anthracycline.
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985
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Liu R, Pazderka F, Singh B, Dossetor JB. Detection of IgG in supernatants of pokeweed mitogen-stimulated human lymphocyte cultures by one step solid-phase radioimmunoassay (SPRIA). Immunol Commun 1984; 13:105-18. [PMID: 6745987 DOI: 10.3109/08820138409025454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A one step solid phase radioimmunoassay is used as a simple and reproducible method of detection and quantitation of IgG produced by human PBL after stimulation with PWM. Modifications of culture conditions are necessary to make culture supernatants suitable for this assay. Pulsing with PWM must be performed in serum-supplemented culture medium for 4-5 days. After thorough washing, medium is then replaced with serum-free medium. Under these conditions, synthesis and secretion of IgG continues for at least 9 days. The amount of IgG produced by 10(6) normal adult PBL as detected in this system is 0.77 +/- 0.47 micrograms. No close correlation between cell proliferation and IgG synthesis was observed.
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986
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Leibovitz A, Liu R, Hayes C, Salman SE. A hypo-osmotic medium to disaggregate tumor cell clumps into viable and clonogenic single cells for the human tumor stem cell clonogenic assay. Int J Cell Cloning 1983; 1:478-85. [PMID: 6672110 DOI: 10.1002/stem.5530010606] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A hypo-osmolar medium and tissue processing technique is described which is useful for disaggregation of residual human tumor cell clumps persisting after mechanical or enzymatic treatment of solid tumors and malignant effusions. The addition of the hypo-osmolar procedure to the standard methods for disaggregation increased the viable single cell yield in solid tumors by 47% and in malignant effusions by 67%. In 5 of the 26 solid tumor specimens tested in the human tumor stem cell assay, clonogenic single cells were obtained with the hypo-osmolar procedure, whereas no growth was observed using standard methods. Overall, the success rate for clonogenicity increased from 46% to 65% for the 26 solid tumors, with the major improvement occurring in ovarian cancer. Clonogenicity was obtained in 80% of malignant effusions both by standard methods and the hypo-osmolar techniques. The increased total yield of clonogenic cells obtained with this procedure enhances the opportunity for experimental versatility and in vitro drug testing.
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987
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Abstract
A series of approaches were tested in order to develop a simple technique for introducing a routine positive control into the Human Tumor Clonogenic Assay. Of the various techniques tested, the best proved to be the addition of the toxic plant lectin abrin to the culture system. When added to the agar underlayer of the culture system so that the final abrin concentration in culture was 10 micrograms/ml, survival of human tumor colony-forming units (TCFU) was reduced to less than 1% of control in 16/34 (47%) of human tumors, to less than 10% in 33/34 (97%) and to less than 30% in all tumors tested (100%). A clear dose-response relationship to fractional survival was observed for individual tumors tested at multiple dose levels of abrin. When the dosage of abrin was reduced to 1 micrograms/ml, survival of TCFU was reduced to less than 30% in 25/28 (89.2%) of experiments. Inclusion of abrin controls in clonogenic assays thus provides an excellent and reproducible positive control to which cytotoxic effects of a variety of therapeutic agents can be compared.
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988
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Koch GH, Bursle AJ, Liu R, Pugh EN. A comparison of gaseous hydrogen embrittlement, slow-strain-rate hydrogen embrittlement, and stress-corrosion cracking InTi-8Ai-1Mo-1V. ACTA ACUST UNITED AC 1981. [DOI: 10.1007/bf02643767] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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989
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Liu R. Telelibrary: library services via satellite. Spec Libr 1979; 70:363-72. [PMID: 10243690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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990
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991
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Alberts DS, Chen HS, Liu R, Himmelstein KJ, Mayersohn M, Perrier D, Gross J, Moon T, Broughton A, Salmon SE. Bleomycin pharmacokinetics in man. I. Intravenous administration. Cancer Chemother Pharmacol 1978; 1:177-81. [PMID: 86392 DOI: 10.1007/bf00253118] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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992
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993
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