13701
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Li J, Tong Y, Xing G. [Botanical survey and quality evaluation of Chinese drug shiwei (folium Pyrrosiae)]. Zhongguo Zhong Yao Za Zhi 1991; 16:520-2, 573. [PMID: 1804194] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This paper deals with a botanical survey and identification of the Chinese drug Shiwei (Folium Pyrrosiae) on the basis of three most widely used species included in the 1985 edition of Chinese Pharmacopoeia, six species used in some districts of China, and two adulterant species. Three active constituents in seven species of Folium Pyrrosiae (mangiferin, isomangiferin and chlorogenic acid) have been determined.
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Affiliation(s)
- J Li
- Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing
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13702
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Broyles SS, Li J, Moss B. Promoter DNA contacts made by the vaccinia virus early transcription factor. J Biol Chem 1991; 266:15539-44. [PMID: 1869571] [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: 12/29/2022] Open
Abstract
Vaccinia virus RNA polymerase requires the heterodimeric protein, vaccinia early transcription factor (VETF), for transcription of early gene templates in vitro. We have analyzed the vaccinia growth factor promoter sequences interacting with VETF at the nucleotide level and provide evidence that the factor contacts the DNA at two separate sites. DNase I protection analysis showed that VETF was found to nucleotides -12 to -29 relative to the transcription initiation site, and also to nucleotides +8 to +10 downstream of the initiation site. The importance of both binding sites for stable complex formation was supported by methylation interference analysis. Using synthetic oligonucleotides encoding different parts of the vaccinia growth factor promoter, it was shown that nucleotides down-stream of the transcription initiation site are required for stable complex formation. Competition binding experiments demonstrated that only the upstream binding site contributes significantly to binding specificity. Binding to two separated DNA sequences results in a bend in the promoter DNA as demonstrated by electrophoretic mobility shift analysis of permuted DNA fragments. These findings suggest that VETF activates transcription by sequence specific binding and structural alteration of the promoter DNA helix.
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Affiliation(s)
- S S Broyles
- Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907
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13703
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13704
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Li N, Li J. [Quantitation of platelet-bound von Willebrand factor in normal subjects and patients with coronary heart disease]. Zhonghua Xin Xue Guan Bing Za Zhi 1991; 19:240-2, 268-9. [PMID: 1813292] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
By using anti-human von Willebrand factor (vWF) monoclonal antibody, SZ-29, and indirect immunofluorescent technique and spectrofluorophotometer, we have quantitated platelet-bound vWF in normal subjects and patients with coronary heart disease (CHD). The results demonstrated that the quantity of platelet-bound vWF in CHD patients was significantly higher than that in normal (P less than 0.01) and the percentage of naturally activated platelet in CHD patients was also significantly higher than that in normal subjects (P less than 0.01). This might be one of the causes of hypercoagulability in CHD patients.
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Affiliation(s)
- N Li
- First Military Medical University, PLA, Guangzhou
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13705
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Abstract
Dispersion of repolarization may contribute to arrhythmias. To determine whether an electrical field stimulus (S2) with a nonuniform potential gradient can induce a dispersion of repolarization, we applied 5 ms rectangular S2 that had a nonuniform or uniform potential gradient during the action potential (AP) of bathed frog ventricular strips. One group had a partitioned bath to produce a nonuniform S2 of 39 +/- 11 V/cm (mean +/- SD) in one half of the 1 x 6 mm strip (H) and 0.3 +/- 0.2 V/cm in the other half (L), and simultaneous intracellular AP recordings in H and L with glass microelectrodes positioned 1.4 +/- 0.4 mm apart. Another group had uniform S2 and an AP recorded near the center of the strip. S1 pacing at 0.5 Hz was performed at one end of the strip and conduction along the strip was monitored. In each experiment, the S2 trials had an S1-S2 interval of 300 ms so that S2 was given during an AP (shocked AP). In both H and L, nonuniform S2 produced cumulative shortening of paced APs and lengthening of each shock AP compared with the paced AP preceding it. Uniform S2 of 1 V/cm did not shorten the paced APs or lengthen the shocked APs indicating that the AP changes in L were not due to the small potential gradient in L. Before beginning nonuniform S2 trials, the AP duration determined at the maximum repolarization rate was 601 +/- 72 ms in H and 602 +/- 71 ms in L (P = ns). During 13-20 nonuniform S2 trials over a 60-80 minute period, paced APs were shortened to 490 +/- 51 ms in H and 515 +/- 39 ms in L while each shocked AP was lengthened, compared with the paced AP preceding it, to 636 +/- 40 ms in H and 561 +/- 21 ms in L (P less than 0.05). Therefore, paced APs after shocks repolarized 25 ms earlier in H than in L and shocked APs repolarized 75 ms later in H than in L. The results show that during the shortened AP in H, the AP in L is shortened, which is consistent with intracellular current from L to H during repolarization. During the prolonged AP in H, the AP in L is prolonged compared with the paced AP preceding it, consistent with intracellular current from H to L during repolarization. Thus, nonuniform shocks can induce a dispersion of repolarization and may induce cell-to-cell interactions during repolarization.
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Affiliation(s)
- S B Knisley
- Department of Medicine, Duke University Medical Center, Durham, NC 27710
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13706
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Li J, Gao H, Jin SX. [A study using FRTL-5 cell for detecting thyroid stimulating antibody activity in serum in patients with Graves disease]. Zhonghua Nei Ke Za Zhi 1991; 30:392-4, 454. [PMID: 1684315] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Using a strain of functioning rat thyroid cells (Fischer rat thyroid line-5, FRTL-5) as target cells and immunoglobin G sedimented from serum by polyethylene glycol (PEG), we studied thyroid stimulating antibody (TsAb) activity in serum of patients with Graves' disease. In a total of 92 cases, TsAb activity was detected in 92.59% (25/27) of the patients with untreated Graves' disease, 75.00% (9/12) of the patients with relapsing Graves' disease and 39.13% (18/46) of the patients with Graves' disease who were euthyroid while taking antithyroid drugs. TsAb activity was also detected in 42.86% (3/7) of the patients with ophthalmic Graves' disease and 12.50% (2/16) of the patients with Hashimoto's thyroiditis. The results showed that TsAb activity can be used as an immunologic index and is valuable in the diagnosis of Graves' disease. Remission and relapse of Graves' disease can be indicated or monitored with the measurement of TsAb activity.
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Affiliation(s)
- J Li
- First Teaching Hospital, Xian Medical University
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13707
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Li J, Nappi AJ. Analysis of Monophenol Oxidase Activity Using High Pressure Liquid Chromatography with Electrochemical Detection. ACTA ACUST UNITED AC 1991. [DOI: 10.1080/01483919108049676] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13708
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Li J, Bilpuch EG, Westerfeldt CR, Mitchell GE, Yang F. Test of level densities with proton resonances. Phys Rev C Nucl Phys 1991; 44:345-353. [PMID: 9967406 DOI: 10.1103/physrevc.44.345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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13709
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Li J. [Electron microscopic study of mesothelial cells in the diaphragm peritoneum of human fetus using the freeze-fracture replica method]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1991; 13:189-94. [PMID: 1831724] [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] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Electron microscopy of mesothelial cells from the diaphragm peritoneum of human fetuses was conducted using the freeze-fracture replica method. The results were as follows: 1) Numerous vesicles were found in single or cluster forms. The latter type was often fused with large vacuoles and opened to the free surface of the cell as secretory granules. 2) On the fractured faces of plasma and nuclear membranes, different numbers of intramembraneous particles and exocytic pores were seen on the PF surface of the plasma membrane. The diameter of the exocytic pores averaged 43 nm, and their maximum number was 26/microns2. 3) Neighboring cells were conjoined by cytoplasmic processes which were seemed to form three-dimensional intertwinings. 4) The microvilli of the mesothelial cells were grouped into three morphological classes, i.e. fork-like microvilli, bulbous ending microvilli, and stick-like microvilli. In addition, the contrast between the present investigation and the results of fine section studies on the diaphragm peritoneum of human fetus is discussed.
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Affiliation(s)
- J Li
- Zhejiang Branch, Hangzhou
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13710
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Wang H, Lin YC, Kang XS, Li GZ, Li J, Liu BY, Qiao LJ, Ma KR. Detection of human papilloma virus (HPV) in laryngeal carcinoma tissue. Chin Med J (Engl) 1991; 104:523-5. [PMID: 1651831] [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: 12/28/2022] Open
Abstract
Using alpha-32P-dCTP labelled human papillomavirus type 16 DNA genome probe (cHPV 16 DNA, cloned and identified from a Chinese cervical invasive carcinoma), 3 HPV 16 genomic relative sequences were detected in 6 biopsies of laryngeal carcinoma. The results showed serious HPV infection in laryngeal carcinoma. This indicates that HPV infection may play an important pathogenetic role in cancer development.
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Affiliation(s)
- H Wang
- Shanxi Cancer Institute, Taiyuan
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13711
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Li J, Bhalla AS, Damjanovic D, Vedam K, Cross LE, Ainger FW. Temperature dependence of optical constants of MoS(2) for pyrooptical devices. Appl Opt 1991; 30:1583-1584. [PMID: 20700322 DOI: 10.1364/ao.30.001583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The temperature sensitivity of the reflectance of MoS(2) under small temperature modulations has been investigated.It is feasible to detect temperature changes of 10(-2) degrees C by monitoring the reflectance, and thus MoS(2) is a potential candidate material for the pyrooptical sensors.
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13712
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Li J. [Persistent ethanol drinking increases liver injury induced by trinitrotoluene exposure: an in-plant case-control study]. Zhonghua Yu Fang Yi Xue Za Zhi 1991; 25:143-5. [PMID: 1914676] [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] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
On the basis of a general survey conducted in a munitions plant, a case-control study was made on the various risk factors of liver damage induced by trinitrotoluene (TNT) exposure in the plant. The result of analysis showed that two factors the amount of ethanol drunk on each occasion and the frequency of drinking every week had a dose response relationship with their OR of occupational TNT Liver damage, but there was no connection between smoking and occupational TNT liver damage and no interaction between drinking and smoking on occupational TNT liver damage. The above results have revealed that exposure to TNT and with a long history of heavy drinking, have a greater risk of suffering from chronic liver impairment than non-drinking TNT exposure workers.
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Affiliation(s)
- J Li
- Ministry of Chemical Industry Institute of Labour Protection, Qingdao
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13713
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Li J, Zhu JD, Appiah A, McCutchan TF, Long GW, Milhous WK, Hollingdale MR. Plasmodium berghei: quantitation of in vitro effects of antimalarial drugs on exoerythrocytic development by a ribosomal RNA probe. Exp Parasitol 1991; 72:450-8. [PMID: 2026219 DOI: 10.1016/0014-4894(91)90091-a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A stage-specific ribosomal RNA probe has been used to quantitate exoerythrocytic development of Plasmodium berghei in primary cultures of mouse hepatocytes. Parasite rRNA could be detected as soon as 6 hr after sporozoite invasion and was increased during schizogony to a maximum at 48 hr, when mature schizonts were identified by microscopy. As few as 10 exoerythrocytic schizonts could be detected by filter blot hybridization, followed by autoradiography and liquid scintillation counting. By hybridizing the culture rRNA samples with either parasite-specific or universal rRNA probes, the in vitro tissue schizonticidal activity and hepatotoxicity of primaquine, two of its analogues, and pyrimethamine, could be assessed. After a 48-hr exposure of the culture to serial dilutions of each drug, a quantitative relationship was demonstrated between the decrease of the parasite rRNA and the increase of the drug concentrations. No significant parasite-specific rRNA could be detected at the concentration achieving complete inhibition of schizont formation but causing no cytotoxic effects on host hepatocytes. In contrast to microscopic-based assays, this molecular approach provides an objective and quantitative in vitro method for rapid screening and evaluation of tissue schizonticidal antimalarials.
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Affiliation(s)
- J Li
- Second Military Medical University, Shanghai, People's Republic of China
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13714
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Abstract
A number of composites based on titania and calcium phosphates, hydroxyapatite, bone ash or beta-tricalcium phosphate, were sintered by glass-encapsulated hot isostatic pressing at 925 degrees C. The mechanical properties of the titania and titania-calcium phosphate composites--three-point bending strength, fracture toughness and Young's modulus--were 250-450 MPa, 2.5-2.9 MPa m1/2 and 230-270 GPa, respectively. Hardness and density were also measured. The results suggest that these composites have potential applications in medicine as implant materials.
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Affiliation(s)
- J Li
- Centre for Dental Technology and Biomaterials, Karolinska Institute, Huddinge, Sweden
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13715
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Li J, Lashier M, Schrader G, Gerstein BC. Oxidation states of vanadium in V-P-O oxidation catalysts31P NMR by spin-echo mapping. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0166-9834(91)85114-b] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13716
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Tong SP, Diot C, Gripon P, Li J, Vitvitski L, Trépo C, Guguen-Guillouzo C. In vitro replication competence of a cloned hepatitis B virus variant with a nonsense mutation in the distal pre-C region. Virology 1991; 181:733-7. [PMID: 2014646 DOI: 10.1016/0042-6822(91)90908-t] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Hepatitis B virus (HBV) variants with a nonsense mutation in the distal pre-C region have been detected in patients positive for anti-HBe, and the complete nucleotide sequence of one cloned pre-C variant has been determined. Transfection of this HBV variant clone into the human hepatoma cell line HepG2 resulted in the appearance of major HBV transcripts, replicative forms of viral DNA evidenced by both molecular hybridization and endogenous DNA polymerase assay, as well as the expression and secretion of HBsAg and HBcAg particles. Western blotting revealed only the 21-kDa HBcAg but not the 17-kDa HBeAg. These results demonstrate the replication capacity of the HBV variant with a nonfunctional pre-C region despite its inability to express HBeAg.
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Affiliation(s)
- S P Tong
- Unité Recherche sur les Hépatites INSERM 271, Lyon, France
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13717
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Abstract
Although free radical formation and lipid peroxidation have been implicated in photoreceptor degeneration following continuous light exposure, recent evidence led us to hypothesize that excessive stimulation of the photoreceptor cells in prolonged light exposure may cause intracellular calcium overload and consequent photoreceptor cell injury. To test this hypothesis, we studied the effects of flunarizine hydrochloride, a calcium overload blocker that inhibits the inositol 1,4,5-triphosphate-induced release of intracellular stores of calcium, in an established rat model of light-induced retinal degeneration. Light and electron microscopic examination of the flunarizine-treated retinas revealed remarkable preservation of the retinal pigment epithelium, rod inner and outer segments, nuclei, and synapses of the photoreceptor cells at all phases of the recovery period. This observation was further supported by morphometric evaluation of the outer nuclear layer thickness, which revealed a greater preservation of the photoreceptor nuclei in the drug-treated animals at 6 and 14 days after exposure. In addition, the rhodopsin levels in the flunarizine-treated retinas were also significantly higher than in the controls in all phases of recovery. The ability of flunarizine to ameliorate light-induced retinal degeneration in the rat supports our hypothesis that elevated intracellular calcium may indeed play a role in light-induced photoreceptor degeneration.
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Affiliation(s)
- D P Edward
- Georgiana Dvorak Theobald Ophthalmic Pathology Laboratory, Department of Ophthalmology, University of Illinois, Chicago College of Medicine 60612
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13718
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Wen X, Li J, Cai F, Wu Y. Electron microscopy studies of lens from two cases of ocular siderosis. Yan Ke Xue Bao 1991; 7:47-8, 20. [PMID: 1843131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- X Wen
- Eye Hospital, Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, China
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13719
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Du B, Li J, Ni J. [Identification of tinglizi by derivative spectrum]. Zhongguo Zhong Yao Za Zhi 1991; 16:133-5, 189. [PMID: 1883492] [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: 12/29/2022]
Abstract
This paper reports a study on the application of derivative spectrum to the identification of tinglizi and its adulterants. The spectra of two normal species of tinglizi have been found identical, but those of six adulterants obviously different from the normal.
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13720
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Abstract
P. gingivalis adheres to A. viscosus on mineral surfaces mimicking teeth. To study whether P. gingivalis proteases contribute to its binding, mutants of P. gingivalis deficient in proteases were compared with their parent strain and a P. gingivalis-type strain for their adherence to A. viscosus on saliva-coated hydroxyapatite by manipulating a radio-isotope binding assay. Adherence of P. gingivalis 2561 to A. viscosus was studied by tests of the effects of incubation temperature and known inhibitors or promoters of proteases. Controls were handled by the assay run in PBS buffer at 22 degrees C. Two mutants deficient in trypsin-like protease were found to be deficient in adherence (% attachment relative to control: 3.2 +/- 0.1% and 11.2 +/- 0.4%), while a collagenase-deficient mutant had an adherence score (51.6 +/- 8.4) closer to that of the parent strain (75.6 +/- 7.2%). Heating P. gingivalis at 70 degrees C decreased its subsequent adherence at 22 degrees C by 80%. Adherence decreased by 60% when the assay was run at 4 degrees C, but increased by 70% at 37 degrees C. Reducing agents (dithiothreitol, cysteine, and mercaptoethanol) enhanced P. gingivalis adherence by 50 to 60%. Protease inhibitors (BZMD, SBTI, TPCK, TLCK, CMPS, PMSF) decreased adherence by 10 to 50%. Also, Hg2+ and Zn2+ decreased adherence by 30 to 50%, and arginine decreased it by 50%. Most of these effects on P. gingivalis adherence were statistically significant (p less than 0.05). Analysis of these data suggests that P. gingivalis proteases may contribute to the cohesion of P. gingivalis and A. viscosus.
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Affiliation(s)
- J Li
- Faculty of Dentistry, University of Toronto, Ontario, Canada
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13721
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Abstract
The beta-oxidation of valproic acid (2-propylpentanoic acid), an anticonvulsant drug with hepatotoxic side effects, was studied with subcellular fractions of rat liver and with purified enzymes of beta-oxidation. 2-Propyl-2-pentenoyl-CoA, a presumed intermediate in the beta-oxidation of valproic acid, was chemically synthesized and used to demonstrate that enoyl-CoA hydratase or crotonase catalyzes its hydration to 3-hydroxy-2-propylpentanoyl-CoA. The latter compound was not acted upon by soluble L-3-hydroxyacyl-CoA dehydrogenases from mitochondria or peroxisomes but was dehydrogenated by an NAD(+)-dependent dehydrogenase associated with a mitochondrial membrane fraction. The product of the dehydrogenation, presumably 3-keto-2-propylpentanoyl-CoA, was further characterized by fast bombardment mass spectrometry. 3-Keto-2-propylpentanoyl-CoA was not cleaved thiolytically by 3-ketoacyl-CoA thiolase or a mitochondrial extract but was slowly degraded, most likely by hydrolysis. The availability of 2-propylpentanoyl-CoA (valproyl-CoA) and its beta-oxidation metabolites facilitated a study of valproate metabolism in coupled rat liver mitochondria. Mitochondrial metabolites identified by high-performance liquid chromatography were 2-propylpentanoyl-CoA, 3-keto-2-propylpentanoyl-CoA, 2-propyl-2-pentenoyl- CoA, and trace amounts of 3-hydroxy-2-propylpentanoyl-CoA. It is concluded that valproic acid enters mitochondria where it is converted to 2-propylpentanoyl-CoA, dehydrogenated to 2-propyl-2-pentenoyl-CoA by 2-methyl-branched chain acyl-CoA dehydrogenase, and hydrated by enoyl-CoA hydratase to 3-hydroxy-2-propylpentanoyl-CoA.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Li
- Department of Chemistry, City College of the City University of New York, New York 10031
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13722
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Abstract
In order to increase the effectiveness of hydrotubation, a plastic cannula was inserted into the fallopian tube under hysteroscopic control. Fifty women with tubal blockage confirmed by HSG were selected for treatment. Hydrotubation solution consisted of hydrocortisone (20 mg), gentamicin (160,000 IU) and procaine (80 mg) in 20 ml distilled water. Repeat HSG was performed. After three treatments, tubal patency (one or both tubes) was achieved in 20 women (40%), and seven pregnancies resulted within 1-18 months. Hysteroscopic hydrotubation may be an alternative treatment for tubal blockage.
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Affiliation(s)
- Z W Lei
- Sichuan Research Institute of Family Planning, China
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13723
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Deluzio K, Wyss U, Li J, Costigan P. Validation of a three-dimensional knee motion assessment system. J Biomech 1991. [DOI: 10.1016/0021-9290(91)90149-h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13724
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Abstract
The interferon induced double-stranded-RNA-dependent eIF-2 alpha kinase has an established role in mediating part of interferons anti-viral effects. Several studies have suggested that it may have additional functions in cells not infected with virus. The mechanism of activation of the kinase and the consequences of its activity in uninfected cells remain to be determined. Our previous results have indicated that the activation (phosphorylation) of this kinase may be an important regulatory signal to the arrest of growth of mouse 3T3-F442A fibroblasts and their subsequent differentiation to adipocytes. We have found that the phosphorylation of the kinase occurred in vivo in the absence of viral infection and in vitro without the addition of dsRNA. We demonstrate here that total cytoplasmic RNA from 3T3-F442A cells contains a regulatory RNA(s) capable of activating dsRNA-dependent eIF-2 alpha kinase. Fractionation of the cytoplasmic RNA by oligo(dT)-cellulose indicated that the regulatory RNA eluted with the poly(A)-rich RNA fraction. It bound tightly to the dsRNA-dependent eIF-2 alpha kinase and was immune-precipitated with its antibodies as a complex of regulatory RNA and dsRNA-dependent eIF-2 alpha kinase. The regulatory RNA activity was further purified by phenol extraction of immune precipitates containing this complex. These findings indicated that the regulatory RNA forms a specific complex with the dsRNA-dependent eIF-2 alpha kinase. The activity of the regulatory RNA was sensitive to the dsRNA-specific RNase VI but not to proteinase K, DNase I or ssRNA-specific RNase T1. The activation of the dsRNA-dependent eIF-2 alpha kinase by regulatory RNA was prevented by addition of a high concentration of poly(I).poly(C). The regulatory RNA was also shown to activate partially purified dsRNA-dependent eIF-2 alpha kinase prepared from rabbit reticulocyte lysates and to inhibit protein synthesis in reticulocyte lysates. Our findings, that cellular RNAs can specifically activate the dsRNA-dependent eIF-2 alpha kinase, are consistent with a physiological role for the dsRNA-dependent eIF-2 alpha kinase and interferon during cell growth and differentiation. The relationship of the regulatory RNA activity to growth and differentiation of 3T3-F442A cells is discussed.
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Affiliation(s)
- J Li
- Department of Biochemistry and Molecular Biology, State University of New York Health Science Center, Syracuse 13210
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13725
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Gatley SJ, Desombre ER, Mease RC, Seevers RE, Hughes A, Li J, Pan ML. Synthesis, purification and stability of no carrier added radioiodinated 1,1-bis(4-hydroxyphenyl)-2-iodo-2-phenylethylene (IBHPE), a prototype triphenylethylene estrogen-receptor binding radiopharmaceutical. Int J Rad Appl Instrum B 1991; 18:769-75. [PMID: 1787086 DOI: 10.1016/0883-2897(91)90016-e] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A triphenylethylene compound [1,1-bis(4-hydroxyphenyl)-2-iodo-2-phenylethylene; IBHPE] has been labeled by halodestannylation with 123I at a specific radioactivity of 13,200 Ci/mmol (by in vitro receptor assay) after HPLC purification. The corresponding 80mBr-labeled compound (BrBHPE), which has a 3-fold higher affinity for the estrogen receptor, was previously prepared and examined as a potential therapeutic radiopharmaceutical exploiting Auger electron toxicity. Stability of IBHPE was a concern because free iodide was generated when HPLC solvents were removed with a stream of nitrogen in a glass vial; however, decomposition was minimal when polypropylene vials were used, and ethanol solutions of [123I]IBHPE were stable for several days at 0-4 degrees C. Tissue distribution studies of IBHPE after intraperitoneal injection to mature female rats showed highest estradiol-inhibitable uptake in the peritoneal estrogen-receptor rich tissues (uterus, ovaries and vagina) at 30 min. Specific uptake (percent dose per gram) in the pituitary, and peritoneal target tissue-to-blood ratios were greater at 2 h than 30 min. In immature female rats, uterus-to-blood ratios of greater than 50, progressively lowered by increasing diethylstilbestrol levels, were obtained. These data demonstrate good binding of IBHPE to the estrogen receptor in vivo, in spite of extensive non specific binding in in vitro estrogen receptor assays. Most of the label in the uterus at 1 h after injection was still unchanged IBHPE. Our results suggest that IBHPE or related 123I-labeled iodovinyl triphenylethylenes could have diagnostic or therapeutic radiopharmaceutical utility.
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Affiliation(s)
- S J Gatley
- Department of Radiology, University of Chicago, IL 60637
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13726
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Li J, Gao X. [Experimental studies on the absorption of aconitine in the upper digestive tract]. Zhongguo Zhong Yao Za Zhi 1991; 16:46-8, 65. [PMID: 2069704] [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] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This paper presents the experimental results of the absorption of orally administered aconitine in the upper digestive tract of rats. Taking the atrioventricular block in EKG as the main parameter, we have found that aconitine could be absorbed by the esophagus and stomach of the rat. Furthermore, the ability of the esophagus to absorb aconitine is stronger than that of the stomach.
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Affiliation(s)
- J Li
- Institute of Chinese Materia Medica, China Academy of Traditional, Chinese Medicine, Beijing
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13727
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Li J. [Activity of serum angiotensin converting enzyme in pregnancy-induced hypertension]. Zhonghua Fu Chan Ke Za Zhi 1991; 26:9-11, 60. [PMID: 1848500] [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] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Activity of serum angiotensin converting enzyme (SACE) was measured in serum of 33 pregnant women with normal blood pressure or pregnancy induced hypertension (PIH), using sensitive Hippurate colorimetric micromethod. The mean level of SACE activity in 17 PIH patients (73.25 +/- 18.81 U/ml) was significantly higher than that in normotensive pregnant women (16 cases) ( 52.36 +/- 9.91 U/ml) (P less than 0.01). The mean arterial blood pressure showed a positive correlation with the level of SACE activity in all pregnant women (Y = 69.089 + 0.494x, r = 0.562, P less than 0.01). In PIH patients, the gestosis index and degree of edema also had statistically significant correlation with the level of SACE activity (Y = -0.560 + 0.056x, r = 0.549, P less than 0.01) (Y = -1.760 + 0.043x, r = 0.629, P less than 0.05). The amount of 24h urinary protein was independent of the level of SACE activity. It suggests that disturbance in regulation of ACE activity may be one of the factors responsible for the development of PIH.
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Affiliation(s)
- J Li
- Changhai Hospital in Shanghai, Second Military Medical College
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13728
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Abstract
The crystal structure of the RNA binding domain of the U1 small nuclear ribonucleoprotein A, which forms part of the ribonucleoprotein complex involved in the excision of introns, has been solved. It contains a four-stranded beta sheet and two alpha helices. The highly conserved segments designated RNP1 and RNP2 lie side by side on the middle two beta strands. U1 RNA binding studies of mutant proteins suggest that the RNA binds to the four-stranded beta sheet and to the flexible loops on one end.
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Affiliation(s)
- K Nagai
- MRC Laboratory of Molecular Biology, Cambridge, UK
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13729
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Olshevsky U, Helseth E, Furman C, Li J, Haseltine W, Sodroski J. Identification of individual human immunodeficiency virus type 1 gp120 amino acids important for CD4 receptor binding. J Virol 1990; 64:5701-7. [PMID: 2243375 PMCID: PMC248709 DOI: 10.1128/jvi.64.12.5701-5707.1990] [Citation(s) in RCA: 351] [Impact Index Per Article: 10.3] [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: 12/30/2022] Open
Abstract
The binding of the CD4 receptor by the human immunodeficiency virus type 1 gp120 exterior envelope glycoprotein is important for virus entry and cytopathic effect. To investigate the CD4-binding region of the gp120 glycoprotein, we altered gp120 amino acids, excluding cysteines, that are conserved among the primate immunodeficiency viruses utilizing the CD4 receptor. Changes in two hydrophobic regions (Thr-257 in conserved region 2 and Trp-427 in conserved region 4) and two hydrophilic regions (Asp-368 and Glu-370 in conserved region 3 and Asp-457 in conserved region 4) resulted in significant reductions in CD4 binding. For most of the mutations affecting these residues, the observed effects on CD4 binding did not apparently result from global conformational disruption of the gp120 molecule, as assessed by measurements of precursor processing, subunit association, and monoclonal antibody recognition. The two hydrophilic regions exhibit a strong propensity for beta-turn formation, are predicted to act as efficient B-cell epitopes, and are located adjacent to hypervariable, glycosylated regions. This study defines a small number of gp120 residues important for CD4 binding, some of which might constitute attractive targets for immunologic intervention.
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Affiliation(s)
- U Olshevsky
- Dana-Farber Cancer Institute, Department of Pathology, Harvard Medical School, Boston, Massachusetts
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13730
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Song G, Tian W, Xiao L, Lian Z, Zhang Z, Li J. [Computed tomography and magnetic resonance imaging of choroidal melanoma]. Yan Ke Xue Bao 1990; 6:76-9. [PMID: 2289579] [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] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Ten choroidal melanomas studied were with computed tomography (CT, nine cases) and magnetic resonance imaging (MRI, one case). Both techniques detected all the intraocular tumors with localization and determination of the extent of the lesions. Three of them were found to have extraocular extension. Because both T1 and T2 were relatively shortened in melanoma, on T-weighted MR image, the tumor was seen as an area of moderately high signal and on T weighted image, melanoma appeared as an area of low signal. MRI can provide a histological diagnosis of this tumor.
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Affiliation(s)
- G Song
- Department of Ophthalmology, Second Affiliated Hospital of Tianjin Medical College, China
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13731
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Zhuang H, Zhu H, Qin Z, Niu X, Li J. Effect of radix Salviae miltiorrhizae extract injection on survival of allogeneic heart transplantation. J TRADIT CHIN MED 1990; 10:276-81. [PMID: 2277531] [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: 12/31/2022]
Abstract
The effect of Radix Salviae Miltiorrhizae (RSM), a commonly used herbal blood circulation invigorator for the treatment of blood stasis in traditional Chinese medicine, on the duration of allograft survival following heterotopic heart transplantation in experimental animals was observed. The results in three heart transplantation models--auricular free graft in mice, abdominal graft in rats and cervical graft in rabbits--suggested that RSM injection in an appropriate dosage prolonged the survival time of cardiac allograft. The herb showed no significant toxicity. It was also found that RSM injection had a synergic effect with corticosteroids against graft rejection.
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Affiliation(s)
- H Zhuang
- Research Center of Plastic Surgery, 3rd Teaching Hospital of Beijing Medical University
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13732
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Li J, Jiang DH, Wang LF, Zeng Y, Li D, Li GX, Liu YY, Shao YM, Zhu ZZ, Kong J. A seral epidemiological study of HIV transmitted through human seral gamma-globulin preparations. Int J Epidemiol 1990; 19:1057-60. [PMID: 1707406 DOI: 10.1093/ije/19.4.1057] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In order to study the potential risk of transferring HIV through human seral gamma-globulin preparations (immunoglobulin), indirect immunofluorescent antibody test (IFA) and Western Blot (WB) assay were applied to 343 random samples (sera) with previous injection of imported human seral gamma-globulins (Ig) positive for Human Immunodeficiency Virus (HIV) antibodies between 1981-1987 for the detection of HIV antibodies. All results were negative and tests on all 23 controls who had previously received Ig made in China also gave negative results. However all 12 batches of imported Ig collected from the above-mentioned users, were positive for HIV antibodies when tested by WB and IFA. This study shows that under normal conditions, human seral gamma-globulin does not transmit HIV.
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Affiliation(s)
- J Li
- Jining Hygiene and Antiepidemic Station, 27 Jinig City, Shandong, People's Republic of China
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13733
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Abstract
Two alpha 1-adrenoceptor subtypes (alpha 1A and alpha 1B) have been distinguished by competitive antagonists and the alkylating agent chloroethylclonidine. The chloroethylclonidine-insensitive subtype (alpha 1A) has been suggested to selectively activate Ca2+ influx through dihydropyridine-sensitive channels in smooth muscle. We compared the effects of chloroethylclonidine and nifedipine on contractile responses to norepinephrine (NE) in rat blood vessels. Pretreatment with chloroethylclonidine caused a large shift to the right and decrease in maximum for NE-induced contractions of rat aorta, however, nifedipine had no effect in this tissue. Chloroethylclonidine had no effect on NE-induced contractions of rat renal arteries, which were almost completely abolished by nifedipine. Both chloroethylclonidine and nifedipine partially attenuated NE-induced contractions in rat mesenteric artery and portal vein. Addition of nifedipine abolished residual contractions remaining after chloroethylclonidine pretreatment in all four types of vessels. The pA2 for the competitive antagonist WB 4101 was highest in renal artery and lowest in aorta. These results suggest that the sensitivity of rat blood vessels to chloroethylclonidine is inversely related to their sensitivity to nifedipine, and support the existence of two alpha 1-adrenoceptor subtypes in rat blood vessels. Rat aorta appears to contain primarily alpha 1B receptors, renal artery primarily alpha 1A, and mesenteric artery and portal vein mixtures alpha 1A of and alpha 1B.
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Affiliation(s)
- C Han
- Third Hospital, Beijing Medical University, Peoples Republic of China
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13734
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Forman D, Sitas F, Newell DG, Stacey AR, Boreham J, Peto R, Campbell TC, Li J, Chen J. Geographic association of Helicobacter pylori antibody prevalence and gastric cancer mortality in rural China. Int J Cancer 1990; 46:608-11. [PMID: 2210881 DOI: 10.1002/ijc.2910460410] [Citation(s) in RCA: 201] [Impact Index Per Article: 5.9] [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: 12/30/2022]
Abstract
To examine the geographic association between Helicobacter pylori infection and gastric cancer, we have assessed the prevalence of IgG antibodies to H. pylori in plasma samples taken in 1983 from 1882 men, aged 35-64 years, in 46 rural counties of the People's Republic of China. The gastric cancer mortality rates in these countries in 1973-75 varied from 3 per 1,000 (cumulative rate, 0-64 years) to 69 per 1,000, while the proportions of the population positive for H. pylori antibodies (based on an average of about 41 men per county) varied from 28% to 96%. After correction for the limited number of blood samples per county, the estimated correlation between H. pylori antibody prevalence and gastric cancer mortality was 40% (p = 0.02). No other type of cancer showed a significant association with H. pylori.
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Affiliation(s)
- D Forman
- Imperial Cancer Research Fund Cancer Epidemiology Unit, Radcliffe Infirmary, Oxford
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13735
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Qu G, Li J. An outline of study on China's population / environment issues. China Popul Newsl 1990; 7:2-4. [PMID: 12286553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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13736
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Kumita T, Sagawa H, Auchincloss P, Blanis D, Bodek A, Budd H, Eno S, Fry CA, Harada H, Ho YH, Kim YK, Mori T, Olsen SL, Shaw NM, Sill A, Thorndike EH, Ueno K, Zheng HW, Abe K, Fujii Y, Higashi Y, Kim SK, Kurihara Y, Maki A, Nozaki T, Omori T, Sakai Y, Sugimoto Y, Takaiwa Y, Terada S, Walker R, Imlay R, Kirk P, Lim J, McNeil RR, Metcalf W, Myung SS, Cheng CP, Gu P, Li J, Li YK, Ye MH, Zhu YC, Abashian A, Gotow K, Hu KP, Low EH, Mattson ME, Piilonen L, Sterner KL, Lusin S, Rosenfeld C, Wang AT, Wilson S, Frautschi M, Kagan H, Kass R, Trahern CG, Breedon RE, Kim GN, Ko W, Lander RL, Maeshima K, Malchow RL. Measurements of R for e+e- annihilation at the KEK collider TRISTAN. Int J Clin Exp Med 1990; 42:1339-1349. [PMID: 10012975 DOI: 10.1103/physrevd.42.1339] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13737
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Liu X, Chen Z, Guan L, Li J, Wu G, Qui J. [A study on the dental adhesive containing phosphate diesters]. Hua Xi Yi Ke Da Xue Xue Bao 1990; 21:281-4. [PMID: 2093066] [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] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Although a lot of kinds of dental adhesives have been applied recently, all of them cannot meet clinical requirement completely. This paper reports a new dental adhesive containing partial phosphate diesters developed by us. We synthesized aryl phosphorodichloridates (APDC), nine kinds of phosphate diester (PDE) adhesive monomers, sodium p-toluenesulfinate (TSS) and p-toluenesulfinic acid (TSA) accelerators, polymethyl methacrylate (PMMA) powder and the other compounds. The chemical structures of PDE adhesive monomers were confirmed by IR, 1HNMR, 31PNMR, refractive index and elementary analysis etc. The results showed that the tensile bond strength (TBS) between PDE dental adhesive and human tooth was better than others reported in China and some others reported in literature.
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Affiliation(s)
- X Liu
- Dental Materials Laboratory, Research Institute of Stomatology
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13738
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Li J. [Role of calcitonin gene-related peptide on acute ischemic-reperfusion renal injury; ultrastructural and membrane lipid peroxidation studies]. Zhonghua Yi Xue Za Zhi 1990; 70:509-11. [PMID: 1964855] [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: 12/29/2022]
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13739
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Wang Y, Yang Z, Li J, Zhang S. [Comparative study of Campylobacter pyloridis and Campylobacter jejuni under electron microscope]. Hua Xi Yi Ke Da Xue Xue Bao 1990; 21:390-3. [PMID: 2094635] [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] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Specimens were made by preparing the ultrathin sections after negative staining and ruthenium red staining. The specimens were observed under electron microscope. Results revealed that the shapes of Campylobacter pyloridis (Cp) and C. jejuni (Cj) were similar, but distinctive differences in their structures were observed. Cp had one to five sheathed flagella at one end with bulbous tips. Cj had only one unsheathed flagellum on each end without a bulbous tip. The cell body of Cp was longer than that of Cj. A layer of thick and dense delicate filament-like substance was attached to the surface of the cell body of Cp in the ultrathin sections with ruthenium red staining, in the case of Cj only a little of such a substance could be noted.
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Affiliation(s)
- Y Wang
- Electron Microscopy Laboratory, Department of Internal Medicine
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13740
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Li J, Chu YH. Drug responses in antigen-induced contractions of tracheal strips of ovalbumin-sensitized guinea pigs. Zhongguo Yao Li Xue Bao 1990; 11:474-6. [PMID: 1718144] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Guinea pig trachea strips were isolated after 21 d of ovalbumin-sensitization. Challenging the preparations with antigen induced a double-phase contractile response (DPCR) which consisted of a rapid contraction (RC) and a tonic contraction (TC). The effects of tetrodotoxin (TTX), atropine, hexamethonium, diphenhydramine and a substance P (SP) antagonist on the DPCR were observed. DPCR was insensitive to atropine or hexamethonium at 1 mumol/L. Diphenhydramine 2 mumol/L abolished RC, and inhibited TC by 48.0 +/- 5.6%. TTX 1 mumol/L and lidocaine 2 mumol/L almost completely abolished TC and reduced RC by 49.6 +/- 6.7% and 44.6 +/- 8.4%, respectively. The substance P antagonist, (D-Arg1, D-2,4-diCl2-Phe5, Asp6, D-Trp7,9, Nle11)-SP 10 mumol/L, inhibited RC by 49.9 +/- 6.1% and TC by 90.7 +/- 9.3%. The results suggest that SP sensory nerve fibers in respiratory tract play an important role in the pathogenesis of DPCR, especially in that of TC.
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Affiliation(s)
- J Li
- Department of Pharmacology, Shanghai Medical University, China
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13741
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Li J, Tong S, Vitvitski L, Zoulim F, Trépo C. Rapid detection and further characterization of infection with hepatitis B virus variants containing a stop codon in the distal pre-C region. J Gen Virol 1990; 71 ( Pt 9):1993-8. [PMID: 2212990 DOI: 10.1099/0022-1317-71-9-1993] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Recently, hepatitis B virus (HBV) replication in the absence of HBe antigenaemia has been attributed to HBV variants with a TAG stop codon in the distal pre-C region associated with one or two point mutations. We describe here a rapid detection method for the diagnosis of such HBeAg-negative HBV variants using selective oligonucleotide hybridization. The entire pre-C region was amplified by the polymerase chain reaction and hybridized under stringent conditions with non-mutated (M0), one (M1) and two (M2) point-mutated oligonucleotide probes. Of the 15 HBeAg-positive (group I) and 20 HBeAg-negative (group II) serum samples studied, 14 samples in group I and one sample in group II hybridized with M0 only and 18 samples in group II hybridized with M1 or M2, or both. The remaining two samples (from groups I and II, respectively) failed to hybridize with any of the three probes. DNA sequencing confirmed mixed distal pre-C sequences in samples hybridizing with more than one probe and also revealed novel mutations in the distal pre-C region of the two samples which failed to hybridize with any of the probes. The latter sample had a +2 frameshift and hence represented a new type of HBeAg-negative HBV variant. This method may therefore prove useful in the diagnosis of infections by HBeAg-negative HBV variants resulting from common mutations in the pre-C region, as well as for the identification of less common variants with novel mutations in the same region.
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Affiliation(s)
- J Li
- Unité de Recherche sur les Hepatites, le SIDA et les Rétrovirus Humains INSERM 271, Lyon, France
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13742
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Li J, Ellen R. Coaggregation of Porphyromonas (Bacteroides) gingivalis, other species of Bacteroides, and Actinomyces viscosus: methodological evaluation. J Microbiol Methods 1990. [DOI: 10.1016/0167-7012(90)90018-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13743
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Abstract
The capability of organ-cultured rat corneas to metabolize cysteine and synthesize glutathione was assessed by use of radioactive L-cyst(e)ine. Metabolites from protein-free tissue extracts were separated and quantified by HPLC, using radioisotope and ultraviolet detectors. Most of the radioactivity detected in the rat cornea was found in three areas of the HPLC elution profile: 1) reduced glutathione, 2) cystine and 3) in a rapidly eluting area (the 'five-minute' area) consisting of several unidentified peaks. The proportion of radioactivity found within the five-minute area increased with time of incubation and became the dominant radioactive peak area by 48 hours of incubation. In contrast to rat lens extracts, the synthesis of glutathione in rat cornea formed a minor portion of the L-cysteine metabolic products. The unlabeled reduced glutathione concentration was relatively stable over a 48-hour incubation period. Synthesis of glutathione was prevented by 0.3 mM buthionine sulfoximine, resulting in more than 90% of the radioactivity being contained in the five-minute peak area. Inhibition of glutathione synthesis allowed the estimation of glutathione's half-life to approximate 10.5 hours in the organ-cultured rat cornea.
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Affiliation(s)
- J Li
- Ophthalmology Department, University of Minnesota, Minneapolis 55455
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13744
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Abstract
DNA sequences of two full-length rabbit muscle phosphofructokinase (RMPFK) cDNAs (A and B) show identical coding sequence but heterogeneous 5' untranslated regions. cDNA-A is formed by removal of a 1.7 kb upstream intron while cDNA-B retains the 3' region of this intron. A 2.8 kb upstream sequence of RMPFK gene contains several features characteristic of housekeeping genes: high GC content (67%) at its 5' end, with 50 CpG sites; five Sp1 sites; and no functional TATA box. Comparison of the 5' sequences of the two RMPFK cDNAs and three human muscle PFK cDNAs (Nakajima, H., et al., (1990) Biochem. Biophys. Res. Com. 166, 637) suggests that a single splicing event occurs involving different splicing donor sites but the same splicing acceptor site, resulting in diversity in the upstream sequence. These observations suggest that transcription of muscle PFK gene may start at multiple sites, another feature of housekeeping genes.
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Affiliation(s)
- J Li
- Department of Biochemistry, Louisiana State University, Baton Rouge 70803
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13745
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Zheng HW, Perez P, Auchincloss P, Blanis D, Bodek A, Budd H, Eno S, Fry CA, Harada H, Ho YH, Kim YK, Kumita T, Mori T, Olsen SL, Shaw NM, Sill A, Thorndike EH, Ueno K, Imlay R, Kirk P, Lim J, McNeil RR, Metcalf W, Myung SS, Cheng CP, Gu P, Li J, Li YK, Ye MH, Zhu YC, Abashian A, Gotow K, Hu KP, Low EH, Mattson ME, Piilonen L, Sterner KL, Lusin S, Rosenfeld C, Wang AT, Wilson S, Frautschi M, Kagan H, Kass R, Trahern CG, Breedon RE, Kim GN, Ko W, Lander RL, Maeshima K, Malchow RL, Smith JR, Stuart D, Abe K, Fujii Y, Higashi Y, Kim SK, Kurihara Y, Maki A, Nozaki T, Omori T, Sagawa H, Sakai Y, Sugimoto Y. Charged-particle multiplicities in e+e- annihilations at sqrt s =50-61.4 GeV. Phys Rev D Part Fields 1990; 42:737-747. [PMID: 10012894 DOI: 10.1103/physrevd.42.737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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13746
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Smith JR, McNeil RR, Breedon RE, Kim GN, Ko W, Lander RL, Maeshima K, Malchow RL, Rowe J, Stuart D, Imlay R, Kirk P, Lim J, Metcalf W, Myung SS, Cheng CP, Gu P, Li J, Li YK, Ye MH, Zhu YC, Abashian A, Gotow K, Hu KP, Low EH, Mattson ME, Piilonen L, Sterner KL, Lusin S, Rosenfeld C, Wang AT, Wilson S, Frautschi M, Kagan H, Kass R, Trahern CG, Abe K, Fujii Y, Higashi Y, Kim SK, Kurihara Y, Maki A, Nozaki T, Omori T, Sagawa H, Sakai Y, Sugimoto Y, Takaiwa Y, Terada S, Walker R, Kajino F, Perticone D, Poling R, Thomas T, Ishi Y, Miyano K, Miyata H, Sasaki T, Yamashita Y, Bacala A, Liu J, Park IH, Sannes F, Schnetzer S. Mass limits of charged Higgs boson at large tan beta from e+e- annihilations at sqrt s =50-60.8 GeV. Int J Clin Exp Med 1990; 42:949-951. [PMID: 10012925 DOI: 10.1103/physrevd.42.949] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13747
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Abstract
Three novel non-CS antigens have been identified on P. falciparum and P. berghei sporozoites and exoerythrocytic parasites. CSP-2 is a sporozoite surface protein common to P. falciparum and P. berghei that elicits antibody-mediated protection, and is also found within P. berghei EE parasites. LSA is a P. falciparum EE-specific antigen localized within the parasitophorous vacuole. LSA-2 is a P. berghei EE-specific antigen, localized on the parasitophorous vacuole membrane, that protected mice to P. berghei sporozoite challenge, and elicited cytotoxic T cells that killed P. berghei EE parasites in vitro.
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13748
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13749
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Abstract
The effect of gamma irradiation on the melanotic encapsulation response of Aedes aegypti black eye Liverpool strain against inoculated Dirofilaria immitis microfilariae (mff) was assessed at 1, 2, 3, and 6 days postinoculation (PI). Mosquitoes received 6000 rad from a 137Cs source (Shepard Mark I irradiator) at 3 days postemergence and were inoculated with 15-20 mff 24 hr later. These mosquitoes were compared to nonirradiated controls that also were inoculated with 15-20 mff at 3 days postemergence. The immune response was significantly reduced in irradiated mosquitoes as compared with controls at all days PI. Although the response was significantly inhibited compared with controls, irradiated mosquitoes were still capable of eliciting a response against 69% of recovered mff at 6 days PI. External gamma irradiation did not significantly affect the proliferation of hemocytes associated with the melanotic encapsulation response of A. aegypti. The number of circulating hemocytes increased in irradiated mosquitoes in response to inoculated mff in a manner similar to nonirradiated, inoculated controls. Hemocyte monophenol oxidase activity, however, was significantly reduced in gamma-irradiated mosquitoes at 12 hr PI as compared with controls. The reduced immunological capacity of irradiated mosquitoes might be related to an interference with gene activity required for the synthesis or activation of enzymes that are directly or indirectly involved in the biochemical processes associated with the production of melanotic substances that sequester mff.
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Affiliation(s)
- B M Christensen
- Department of Veterinary Science, University of Wisconsin, Madison 53706
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13750
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Li J, Du XG. [Gonadoblastoma: a report of 3 cases]. Zhonghua Fu Chan Ke Za Zhi 1990; 25:229-31, 253. [PMID: 2209224] [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] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Three cases of gonadoblastoma are presented. All the patients are phenotypic female and sexually abnormal. The chromosomal karyotypes are 46; XY in two, the another one is 46, XX/46, XY/47, XXY mosaicism. Streak gonads and hypertrophy are noticed. The pathologic characteristics are discussed in detail in relation to the clinical picture.
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Affiliation(s)
- J Li
- International Peace Maternity and Child Health Hospital of the China Welfare Institute, Shanghi
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