6701
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O'Connell RF, Wang L. Phase-space representations of the Bloch equation. PHYSICAL REVIEW. A, GENERAL PHYSICS 1985; 31:1707-1711. [PMID: 9895677 DOI: 10.1103/physreva.31.1707] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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6702
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Rothbard JB, Fernandez R, Wang L, Teng NN, Schoolnik GK. Antibodies to peptides corresponding to a conserved sequence of gonococcal pilins block bacterial adhesion. Proc Natl Acad Sci U S A 1985; 82:915-9. [PMID: 3919385 PMCID: PMC397158 DOI: 10.1073/pnas.82.3.915] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Antisera generated against each of seven synthetic peptides corresponding to constant and variable sequences of the pilin from gonococcal strain MS11 were assayed for their ability to crossreact with intact pili from both homologous and heterologous strains. The peptides elicited roughly equal antipeptide responses but varied substantially in their ability to elicit antisera that crossreacted with intact pili. Of the antisera to peptides corresponding to regions of conserved sequence, antisera directed against residues 69-84 were the most efficient in binding pili from all strains tested in both solid-phase assays and immunoblots. Anti-69-84 also efficiently precipitated a tryptic fragment of pilin known to bind human endocervical cells. Sera against the two peptides (121-134 and 135-151) previously shown to contain strain-specific epitopes crossreacted with MS11 pili equally well, but differed in their ability to bind pili from heterologous strains. Anti-121-134 was strain-specific whereas anti-135-151 bound all pilin tested. Each of the sera was examined for its ability to inhibit bacterial adhesion to a human endometrial carcinoma cell line. Sera generated against residues 41-50 and 69-84 successfully inhibited a heterologous gonococcal strain from binding. These peptides could be important components of an effective vaccine for the prevention of gonorrhea.
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6703
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Wang L, Ravani B. Recursive computations of kinematic and dynamic equations for mechanical manipulators. ACTA ACUST UNITED AC 1985. [DOI: 10.1109/jra.1985.1087016] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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6704
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Wang L. [Polyacrylamide gel-disc electrophoresis of tiger bone--a new method of identifying tiger bones]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1984; 9:16-7. [PMID: 6242375] [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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6705
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Wang L. [Effect of magnesium on erythrocytic electrolytes in digitalis poisoning]. ZHONGHUA NEI KE ZA ZHI 1984; 23:333-5, 396. [PMID: 6510127] [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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6706
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Wang L, Zuo QH, Liu SR, Wang SH. Clinical value of determination of serum concentration of antiepileptics. Chin Med J (Engl) 1984; 97:165-70. [PMID: 6432478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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6707
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Chen C, Gao FH, Wang L. [Studies on new antimalarials, synthesis of derivatives of benzo(g)quinoline with double Mannich bases of aminophenol]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1983; 18:965-968. [PMID: 6679179] [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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6708
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Wang L, Zhao HY. The effect of magnesium on erythrocytic electrolytes in digitalis toxicity. ACTA ACADEMIAE MEDICINAE WUHAN = WU-HAN I HSUEH YUAN HSUEH PAO 1983; 3:236-41. [PMID: 6316223 DOI: 10.1007/bf02856887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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6709
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Li Z, Zhang YC, Wu YQ, Gong W, Wang L. Histocompatibility antigen loss in gastric carcinoma cells and its significance. Chin Med J (Engl) 1983; 96:759-64. [PMID: 6327196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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6710
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Wang L, Maniglia CA, Mella SL, Sartorelli AC. N-(substituted-phenyl)-D-glycopyranosylamines and their O-acetyl derivatives as potential modifiers of the formation of glycosaminoglycans. J Med Chem 1983; 26:1323-6. [PMID: 6887209 DOI: 10.1021/jm00363a020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
D-Arabinosyl, D-ribosyl, D-glucosyl, D-galactosyl, D-mannosyl, and L-rhamnosyl N-glycosides of p-aminobenzoic acid and their O-acetyl derivatives have been synthesized, and their ability to (a) inhibit the replication of cultured B16 melanoma cells and (b) modify the synthesis of glycosaminoglycans by these neoplastic cells have been evaluated. The most cytotoxic compound of the series was N-(p-carboxyphenyl)-2,3,4-tri-O-acetyl-D-arabinopyranosylamine (8), which produced 50% inhibition of cellular proliferation at a concentration of 4 microM; a number of other compounds were relatively cytotoxic, causing 50% inhibition of cell replication at levels of 18 to 49 microM. These effects were not due to modification of glycosaminoglycan biosynthesis, since these compounds were ineffective as inhibitors or initiators of the formation of these macromolecules.
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6711
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Wang L, Maniglia CA, Mella SL, Sartorelli AC. Synthesis of N-(Substituted-phenyl)-D-xylopyranosylamines as potential modifiers of the formation of glycosaminoglycans. J Med Chem 1983; 26:629-32. [PMID: 6842504 DOI: 10.1021/jm00359a002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
N-(Substituted-phenyl)-D-xylopyranosylamines and their O-peracetyl derivatives have been synthesized and tested for their ability (a) to inhibit the replication of cultured B16 melanoma cells and (b) to modify the synthesis of glycosaminoglycans by these neoplastic cells. The most cytotoxic compound synthesized was N-(p-methoxyphenyl)-D-xylopyranosylamine (6), which produced 50% inhibition of cellular proliferation at a concentration of 2 microM; a number of other compounds were relatively cytotoxic, causing 50% inhibition of cell replication at levels of 12 to 25 microM. Several of the synthesized xylosides appeared to be capable of serving as artificial initiators of glycosaminoglycan synthesis, with the most active agents causing approximately 2- to 4-fold increases in the incorporation of [35S]sulfate into the glycosaminoglycans of B16 melanoma cells excreted into the culture medium.
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6712
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Marikovsky Y, Wang L, Inbar M. Distribution of surface anionic sites on mouse hybrid myelomas. EXPERIMENTAL CELL BIOLOGY 1983; 51:242-9. [PMID: 6628823 DOI: 10.1159/000163199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The surface anionic site distribution on membranes of a monoclonal antibody-producing hybridoma cell line, and its two parental cells: normal spleen cells of immunized BALB/c mice and cells from a mouse myeloma line (NS-1), were investigated with the aid of the cationized ferritin (CF) labelling method, following glutaraldehyde/formaldehyde fixation of cells. The patch-like CF distribution on the hybridoma cells is similar to that of the NS-1 myeloma cells, but distinct from the even and continuous CF distribution of the immunized and nonimmunized normal spleen lymphocytes. The similarity in the formation of patch-like CF heaps, both on myeloma and hybrid cells is discussed in respect to the surface charge characteristic determined by cell fusion.
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6713
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Wang L, Rahamim N, Harpaz N, Hexter CS, Inbar M. Monoclonal antibodies against immunodeterminants associated with the alpha and beta subunits of human chorionic gonadotropin. Hybridoma (Larchmt) 1982; 1:293-302. [PMID: 6208130 DOI: 10.1089/hyb.1.1982.1.293] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Spleen cells of BALB/c mice immunized with human chorionic gonadotropin (HCG), a glycopeptide hormone composed of two nonidentical alpha and beta subunits, were fused with NS-1 mouse myeloma cells. Two hybrid cell lines, cone PC2 and clone PD3 secreting monoclonal antibodies (McAb) to HCG were isolated. With the aid of a double antibody radioimmunoassay it was established that PC2-McAb recognizes an immunodeterminant associated with beta-HCG subunit, whereas, PD3-McAb recognizes an epitope present on the alpha-HCG subunit. Both monoclonal antibodies showed an affinity constant of approximately 5 X 10(10) L/M. Because of these immunological characteristics, only PC2-McAb specifically reacts with HCG and shows cross-reactivities of less than 0.1% to other related human glycopeptide hormones. On the other hand, using a hemagglutination test based on antibody induced agglutination of sheep red blood cells coated with HCG, it was shown that only PD3-McAb is capable of inducing a positive reaction, although both monoclonal antibodies have a similar binding capacity to the coated cells. The potential of these two new monoclonal reagents for the qualitative detection and quantitative determination of HCG in human biological fluids is discussed.
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6714
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Marikovsky Y, Wang L, Inbar M. Distribution of surface anionic sites during formation of mouse hybrid myelomas. Ultramicroscopy 1982. [DOI: 10.1016/0304-3991(82)90078-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6715
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Wang L, Boyarsky LL, Frazier DT. The effect of transmitter antagonists on phasic respiratory neurons. J Neurosci Res 1982; 8:657-64. [PMID: 6131143 DOI: 10.1002/jnr.490080410] [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: 01/18/2023]
Abstract
The activity of inspiratory neurons in the nucleus tractus solitarius (NTS) and of expiratory neurons in the nucleus retroambigualis (RNA) was recorded during the iontophoresis of L-glutamate, bicuculline, and strychnine in chloralose-urethane-anesthetized cat. Bicuculline methoxide caused increased activity of NTS and NRA neurons during their active or burst phases. Neither bicuculline nor strychnine caused increased activity during the silent phases of NTS or NRA neurons. When neurons were driven to fire during their silent phase by L-glutamate, the application of bicuculline methoxide caused a diminution of the evoked activity. It is concluded that both inspiratory and expiratory neurons receive inhibitory inputs during both their active and silent phases. Gamma-aminobutyric acid appears to be gating both the excitatory and inhibitory information to NTS and NRA neurons. Strychnine was generally ineffective in changing the firing patterns of inspiratory and expiratory neurons suggesting a limited role of glycine, taurine, and L-alanine in the respiratory network.
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6716
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Wang L. [Treatment of 36 cases of chronic atrophic gastritis with "Wei-An" No. I and II--comparative pathological analysis by gastroscopy and biopsy]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1981; 1:80. [PMID: 6219784] [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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6717
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Daiger SP, Rummel DP, Wang L, Cavalli-Sforza LL. Detection of genetic variation with radioactive ligands. IV. X-linked, polymorphic genetic variation of thyroxin-binding globulin (TBG). Am J Hum Genet 1981; 33:640-8. [PMID: 6789676 PMCID: PMC1685094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
A genetically determined, polymorphic electrophoretic variant of thyroxin-binding alpha-globulin (TBG) is found in sera from populations of African and Oceania origin, although not in Caucasians nor Orientals. The TBG polymorphism is inherited in X-linked fashion, based on data from American blacks, and thus provides an X-chromosome marker with a relatively high gene frequency in this ethnic group (frequency of the slow allele, TBGs, is 11%). This slow variant should prove valuable in expanding the map of the X chromosome and in linkage studies. An additional family exhibiting X-linked TBG deficiency is also described.
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6718
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Wang L, Karmody CS, Pashayan H. Waardenburg's syndrome: variations in expressivity. Otolaryngol Head Neck Surg 1981; 89:666-70. [PMID: 6793979 DOI: 10.1177/019459988108900428] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Twenty-seven subjects with a family history of Waardenburg's syndrome were examined with respect to 18 specific characteristics of the syndrome, with particular emphasis in identifying the spectrum of the phenotypic expression of affected persons. Our results indicate that patients with the syndrome may have a variety of clinical signs, and an accurate diagnosis will therefore depend on a thorough and pertinent family history and physical examination.
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6719
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Xie JX, Wang L, Liu CX, Zhang DY. [The identification and total synthesis of aichasu, an antitussive agent (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:425-8. [PMID: 7270169] [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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6720
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Zhang YC, Gung W, Liu PT, Wang L, Zou JZ. [Immunologic diagnosis of intestinal metaplasia in the gastric mucosa (author's transl)]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1981; 3:81-5. [PMID: 7307900] [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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6721
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Reitz RC, Wang L, Schilling RJ, Starich GH, Bergstrom JD, Thompson JA. Effects of ethanol ingestion on the unsaturated fatty acids from various tissues. Prog Lipid Res 1981; 20:209-13. [PMID: 7342084 DOI: 10.1016/0163-7827(81)90039-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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6722
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Xie Y, Wang J, Zhang G, Wang L. Purification of HBsAg from human placental blood by density-gradient zonal centrifugation. J Med Virol 1981; 7:171-8. [PMID: 7264613 DOI: 10.1002/jmv.1890070212] [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: 01/24/2023]
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6723
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6724
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Coan RM, Wong G, Ku SL, Chan YC, Wang L, Ozer FT, Coan PL. The acupuncture treatment of low back pain: a randomized controlled study. THE AMERICAN JOURNAL OF CHINESE MEDICINE 1980; 8:181-9. [PMID: 6446852 DOI: 10.1142/s0192415x80000141] [Citation(s) in RCA: 103] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The acupuncture treatment situation was beneficial to the majority of people with low back pain. This was shown by the use of short-term controls and long-term controls, although the latter were not intended in the study design. After acupuncture, there was a 51% pain reduction in the average pain score in the Immediate Treatment Group. The short-term controls, the Delayed Treatment Group, had no reduction whatsoever in their pain scores at the comparable followup period. Later, the Delayed Treatment Group bere also treated by acupuncturists, and reported 62% less pain. When these two treatment groups were compared at 40 weeks with long-term controls (Inadequate Treatment Group), the Inadequate Treatment Group still had the same pain scores, on the average, as when they enrolled in the study. Both treatment groups, on the average, had 30% lower pain scores. Furthermore, 58% of the treatment groups felt that they were definitely improved at 40 weeks, while only 11% of the Inadequate Treatment Group felt definitely improved at 40 weeks.
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6725
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Huang G, Wang G, Zhang D, Zhang R, Lin H, Wang L. Surgical treatment of carcinoma of the lung: report of 340 cases. Chin Med J (Engl) 1979; 92:744-7. [PMID: 116817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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6726
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Zhao ZZ, Jiang XJ, Wang L, Wei Z. [Studies on antimicrobial and antiviral compounds--synthesis of derivatives of decanoyl acetaldehyde (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1979; 14:428-33. [PMID: 532640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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6727
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Huang L, Wu Y, Xi Y, Wang L, Jiang X, Xu S. [Studies on antitumor and antiviral compounds. V. Synthesis of alpha-keto-beta-ethoxy-butyraldehyde bisthiosemicarbazone analogs (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1979; 14:368-73. [PMID: 517134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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6728
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Toleikis JR, Wang L, Boyarsky LL. Effects of excitatory and inhibitory amino acids on phasic respiratory neurons. J Neurosci Res 1979; 4:225-35. [PMID: 38345 DOI: 10.1002/jnr.490040310] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The responsiveness of phasically active brainstem respiratory neurons to several amino acids was investigated in cats under Dial anesthesia. Four-barreled microelectrodes were used to extrude iontophoretically the putative neurotransmitters L-glutamate, L-asparatate, glycine, and gamma-aminobutyric acid (GABA), L-glutamate and L-aspartate caused increased activity when applied to either inspiratory or expiratory neurons and appeared to be equal in efficacy. Likewise, GABA and glycine depressed ongoing phasic neural activity of both inspiratory and expiratory units. In this case, however, the dosage of GABA required to produce a given depression was significantly less than the required dosage of glycine. These findings support the hypothesis that L-glutamate and/or L-aspartate may act as excitatory neurotransmitter agents at the synapses of brainstem respiratory neurons and conversely, GABA may act as the natural inhibitory neurotransmitter.
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6729
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Wang L, Randolph H. Activation of Lipolysis. I.Distribution of Lipase Activity in Temperature Activated Milk. J Dairy Sci 1978. [DOI: 10.3168/jds.s0022-0302(78)83664-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6730
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Daiger SP, Labowe ML, Parsons M, Wang L, Cavalli-Sforza LL. Detection of genetic variation with radioactive ligands. III. genetic polymorphism of transcobalamin II in human plasma. Am J Hum Genet 1978; 30:202-14. [PMID: 655167 PMCID: PMC1685573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
We detected genetically determined, electrophoretic variants of vitamin B12 binding proteins, most probably transcobalamin II, in human plasma. Polymorphic variants were observed in all populations tested; the two most common alleles (of at least four detected to date) attain frequencies of greater than 40% in Caucasians and Orientals. The variants are autosomally inherited and are seen as doublets in homozygotes, and four-banded patterns, the sum of two dissimilar homozygote patterns, in heterozygotes. The technique used in this survey, polyacrylamide gel electrophoresis (PAGE) autoradiography of plasma and serum labeled in vitro with 57Co-vitamin B12 is particularly applicable to the study of trace proteins such as the transcobalamins (10(-9)M). Possible functional variation in the TC II allele products is described, and the selective significance of this worldwide polymorphism is considered.
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6731
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Chang FH, Wang L. Current practice in toxic dysentery. Report of 47 cases. Chin Med J (Engl) 1978; 4:154-7. [PMID: 95933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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6732
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Yarkoni E, Wang L, Bekierkunst A. Stimulation of macrophages by cord factor and by heat-killed and living BCG. Infect Immun 1977; 16:1-8. [PMID: 406198 PMCID: PMC421478 DOI: 10.1128/iai.16.1.1-8.1977] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Trehalose-6,6'-dimycolate (cord factor; CF) injected into the peritoneal cavity of mice induced stimulation of the peritoneal macrophages, evidenced both by increased activity of the lysosomal enzyme, acid phosphatase, and by increased phagocytosis of Listeria monocytogenes. The increase in enzyme activity and phagocytosis was similar to that induced by killed or living BCG. When administered intravenously, CF or BCG did not induce stimulation of peritoneal macrophages. CF when added to tissue cultures of normal peritoneal cells did not induce increased acid phosphatase activity or increased phagocytosis of L. monocytogenes.
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6733
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Wang L, Galehouse D, Mellon P, Duesberg P, Mason WS, Vogt PK. Mapping oligonucleotides of Rous sarcoma virus RNA that segregate with polymerase and group-specific antigen markers in recombinants. Proc Natl Acad Sci U S A 1976; 73:3952-6. [PMID: 186781 PMCID: PMC431279 DOI: 10.1073/pnas.73.11.3952] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The RNase-T1-resistant oligonucleotides of two Prague Rous sarcoma viruses with temperature-sensitive (ts) DNA polymerases (DNA nucleotidyltransferases), termed ts LA 337 and 335 of one leukosis virus, RAV-6, and 20 of their recombinant progeny have been mapped relative to the 3' poly (A) terminus of the viral RNA. The resulting oligonucleotide maps have been ocrrelated with markers of the four known viral genetic elements encoded in the RNA of 10,000 nucleotides. In accord with previous results recombinant RNAs contained (i) oligonucleotides characteristic of the src gene, coding for sarcoma formation, between the poly(A) end and 2000 nucleotides and (ii) olignucleotides characteristic of the env gene, coding for the envelope glycoprotein, between 2500 and 5000 nucleo tides from the poly(A) end. (iii) A cluster of four oligonucleotides that mapped between 6000 and 8000 nucleotides from the 3' poly(A) end of each RNA was shared by both parental viruses and all recombinants. Since all other map segments of our recombinants failed to segregate with the ts- or wild-type markers of the parental DNA polymerase gene (pol), it was concluded that the ts pol lesion maps in this RNA segment. (iv) The 5' segment of each recombinant RNA contained a cluster of four to five oligonucleotides whose parental origin correlated with an electrophoretic marker of one of the parental virion proteins, p27, a major product of the viral gag gene. The gene order 5'-gag-pol-env-src-poly(A) is consistent with our data.
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6734
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Stolf AM, D'Abronzo FH, Wang L, Salles JM, Andrade HF, Silva SM, Brentani R. Selection of albumin mRNA by thioacetamide. Biochem Biophys Res Commun 1976; 72:1576-84. [PMID: 999691 DOI: 10.1016/s0006-291x(76)80194-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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6735
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Abstract
Pregnancy intervals were calculated for 54,369 later-born singletons delivered during 1969 in the State of North Carolina. Subsequent infant deaths among this cohort were categorized into probable sudden infant death syndrome (SIDSp), other postneonatal home deaths, all postneonatal hospital deaths, all neonatal deaths, and all deaths due to congenital malformations. Each death was matched with a control drawn from the population of infants surviving the first year of life. The matching variables were maternal age, race, mother's education and number of previous live births. All categories of death showed higher proportions of short intervals among cases than controls. Comparing the interval distributions by means of the X2 test for linearity produced significant results for only SIDSp and neonatal deaths. It was concluded, however, that short-pregnancy interval probably has a similar effect on the risk of death from all five cause of death groups. The introduction of birthweight as a fifth matching variable left no significant differences in the distributions of pregnancy intervals between cases and controls. This was interpreted as evidence that short pregnancy interval exerts its influence on risk of death in infancy through its effect on birthweight. The estimated reduction in prematurity and infant mortality that might result from the elimination of short pregnancy intervals was 5% and 6%, respectively.
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6736
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Meyers DA, Conneally PM, Lovrien EW, Magenis RE, Merritt AD, Norton JA, Palmer CG, Rivas ML, Wang L, Yu PL. Linkage group I: the simultaneous estimation of recombination and interference. CYTOGENETICS AND CELL GENETICS 1976; 16:335-9. [PMID: 975904 DOI: 10.1159/000130625] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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6737
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Rivas ML, Conneally PM, Lovrien EW, Magenis RE, Merritt AD, Meyers DA, Palmer CG, Parks M, Wang L, Yu PL. The linkage and mapping relationships of 1 qh. CYTOGENETICS AND CELL GENETICS 1976; 16:347-50. [PMID: 975906 DOI: 10.1159/000130629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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6738
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Wang L, Simões CL, Sonohara S, Brentani M, Andrade HF, da Silva SM, Salles JM, Marques N, Brentani R. Isolation and characterization of collagen messenger RNA*. Nucleic Acids Res 1975; 2:655-66. [PMID: 1144059 PMCID: PMC343618 DOI: 10.1093/nar/2.5.655] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Chick embryo collagen-synthesizing polysomes were isolated by differential centrifugation. RNA extracted from these particles was chromatographed in oligo(dT)-cellulose solumns and the mRNA thus obtained characterized as collagen mRNA by its electrophoetical mobility in acrylamide gels (equivalent to 1.05 x 10-6 daltons) and its effect upon a cell-free system derived from Krebs ascites tumor cells. The incorporation of 3H-proline was markedly dependent upon rabbit reticulocyte initiation factors and inhibited by initiation inhibitors such as aurintricaboxilate and pyrocatechol violet. The incorporation product was characterized as collagen by its lack of tryptophan, digestibility by purified bacterial collagenase, and by its co-chromatography with unlabled chick collagen in Sephadex G-200 and CM-cellulose columns.
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6739
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Meyers DA, Conneally PM, Hecht F, Lovrien EW, Magenis E, Merritt AD, Palmer GC, Rivas ML, Wang L. Linkage group I: multipoint mapping. CYTOGENETICS AND CELL GENETICS 1975; 14:381-9. [PMID: 1192823 DOI: 10.1159/000130390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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6740
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Rivas ML, Conneally PM, Hecht F, Lovrien EW, Magenis E, Merritt AD, Meyers DA, Palmer CG, Wang L. Linkage relationships of 1qh to Amy, Fy, PGM1, and Rh. CYTOGENETICS AND CELL GENETICS 1975; 14:409-17. [PMID: 1192828 DOI: 10.1159/000130395] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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6741
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Wang L, Andrade HF, Silva SM, Simões CL, D'Abronzo FH, Brentani R. Isolation and characterization of collagen-synthesizing polysomes from chick embryos. PREPARATIVE BIOCHEMISTRY 1975; 5:45-57. [PMID: 168569 DOI: 10.1080/00327487508061561] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Collagen-synthesizing polysomes were isolated by low-speed centrifugation of the post-mitochondrial supernatant of chick homogenates. Electron microscopy of the fraction thus isolated shows it to be exclusively composed of ribosomes. Amino acid incorporation in vitro showed that these particles were efficient in the incorporation of proline, but not tryptophan, as opposed to ribosomes obtained from the supernatant of the low-speed centrifugation. The incorporation process was highly dependent on GTP, and exibited an optimal Mg2+concentration of 5.6mM. The reaction was inhibited by RNase, elongation inhibitors as anysomycin, sparsomycin, fusidic acid and GDPCP. It was also moderately inhibited by initiation inhibitors such as aurintricarboxilic acid and pyrocatechol violet. The product of the incorporation was characterized as collagen by its sensitivity towards purified collagenase, lack of tryptophan, chromatography in CM-cellulose and molecular sieve chromatography in Sephadex G-200.
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6742
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Cavalli-Sforza LL, Santachiara SA, Wang L, Erdelyi E, Barchas J. Electrophoretic study of 5-hydroxytryptophan decarboxylase from brain and liver in several species. J Neurochem 1974; 23:629-34. [PMID: 4547785 DOI: 10.1111/j.1471-4159.1974.tb04385.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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6743
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Yarkoni E, Wang L, Bekierkunst A. Suppression of growth of Ehrlich ascites tumor cells in mice by trehalose-6,6'-dimycolate (cord factor) and BCG. Infect Immun 1974; 9:977-84. [PMID: 4208531 PMCID: PMC414920 DOI: 10.1128/iai.9.6.977-984.1974] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Growth of Ehrlich ascites tumor cells in mice pretreated with cord factor was compared to growth of the tumor cells after pretreatment with Calmette-Guérin bacilli. Growth of Ehrlich ascites cells was strongly inhibited in the peritoneal cavities of mice pretreated with 80 mug of cord factor. The median survival time of the animals was prolonged (70 versus 17 days), and 40% of the mice survived more than 90 days. Tumor suppression was still detectable 36 days after administration of cord factor. The effect of cord factor was local. Comparable results were obtained with living or killed Calmette-Guérin bacilli. The results are discussed.
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6744
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Wang L, Brentani R. [Mechanism of protein synthesis]. REVISTA DO HOSPITAL DAS CLINICAS 1974; 29:159-62. [PMID: 4453776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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6745
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Paris JE, Wang L. Letter: Effect of immunological inhibition of lysosome function on radiation survival of rat sarcoma cells in culture. INTERNATIONAL JOURNAL OF RADIATION BIOLOGY AND RELATED STUDIES IN PHYSICS, CHEMISTRY, AND MEDICINE 1974; 25:95-8. [PMID: 4543820 DOI: 10.1080/09553007414550101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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6746
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Marques N, Wang L, Myiashita M, Stolf AM, Balsamo J, Brentani R. Reiteration of DNA complementary to a cytoplasmic non-ribosomal RNA. Biochem Biophys Res Commun 1973; 53:317-25. [PMID: 4741550 DOI: 10.1016/0006-291x(73)91436-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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6747
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Takayama K, Wang L, Merkal RS. Scanning electron microscopy of the H37Ra strain of Mycobacterium tuberculosis exposed to isoniazid. Antimicrob Agents Chemother 1973; 4:62-5. [PMID: 4208900 PMCID: PMC444505 DOI: 10.1128/aac.4.1.62] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The morphology of cells of the H37Ra strain of Mycobacterium tuberculosis exposed to 0.5 mug of isonicotinic acid hydrazide (isoniazid) per ml was examined by scanning electron microscopy (SEM). Cells that were exposed to isoniazid for 3 h showed no detectable change, whereas cells exposed to the drug for 24 h exhibited diverse morphological features. From our examination of these SEM pictures, we have reconstructed the probable sequence of morphological changes to be as follows: (i) the wrinkling of the cell surface was ascribed as the earliest observable change, (ii) the cell surface then became very rough and ragged, (iii) eventually the cytoplasmic material was extruded from the cell, (iv) this event produced a collapsed cell, (v) the cells began to fragment, (vi) the fragmented cells then coalesced to form an amorphous mass of cell debris.
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6748
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Brentani R, Peres CS, Oda CH, Wang L. Messenger RNA processing in vertebrate cells. BASIC LIFE SCIENCES 1973; 1:169-78. [PMID: 4359215 DOI: 10.1007/978-1-4684-0877-5_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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6749
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Wang L, Takayama K. Relationship between the uptake of isoniazid and its action on in vivo mycolic acid synthesis in Mycobacterium tuberculosis. Antimicrob Agents Chemother 1972; 2:438-41. [PMID: 4207759 PMCID: PMC444336 DOI: 10.1128/aac.2.6.438] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
A direct relationship was established between the rate of uptake of isoniazid and the action of this drug on in vivo mycolic acid synthesis in Mycobacterium tuberculosis H37Ra. The rate of uptake of isoniazid increased linearly with its external concentration and appeared to reach a maximal value of 52 pmoles per hr per 10(9) cells at an external concentration of about 13 mum. Correspondingly, the rate of inhibition of mycolic acid synthesis increased with the rise in the rate of uptake of the drug. A 50% inhibition of mycolic acid synthesis occurred when the uptake of isoniazid reached 5.2 pmoles per 10(9) cells. Calculations showed that this level of drug uptake represents an internal cellular concentration of 9 mum. These results show clearly that the action of isoniazid on the mycolate synthetase system of M. tuberculosis is rapid and that this enzyme system is highly sensitive to the drug.
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6750
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Takayama K, Wang L, David HL. Effect of isoniazid on the in vivo mycolic acid synthesis, cell growth, and viability of Mycobacterium tuberculosis. Antimicrob Agents Chemother 1972; 2:29-35. [PMID: 4208567 PMCID: PMC444261 DOI: 10.1128/aac.2.1.29] [Citation(s) in RCA: 219] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
When an actively growing culture of the H37Ra strain of Mycobacterium tuberculosis was exposed to isoniazid at a concentration of 0.5 mug/ml, the cells began to lose their ability to synthesize mycolic acids immediately. After 60 min, the cells had completely lost this ability. The synthesis of the three mycolate components-alpha-mycolate, methoxymycolate, and beta-mycolate-was inhibited. The viability of the isoniazid-treated cells was unaffected up to about 60 min of exposure, after which time there was a gradual decline in the viability to about 18% after 180 min. Correspondingly, growth of the drug-treated cells slowed down and stopped after 24 hr. The inhibition of the synthesis of mycolic acids was reversible if the drug was removed before the loss of viability set in. Incubation of the viable cells in the absence of the drug for 24 hr restored the mycolate synthesis. These results strongly suggest that the inhibition of the synthesis of the mycolic acids is closely associated with the primary mechanism of action of isoniazid on the tubercle bacilli. The sequence of events which leads to the loss of viability of cells exposed to isoniazid is described.
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