10301
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Zhang J, Marynen P, Devriendt K, Fryns JP, Van den Berghe H, Cassiman JJ. Molecular analysis of the isochromosome 12P in the Pallister-Killian syndrome. Construction of a mouse-human hybrid cell line containing an i(12p) as the sole human chromosome. Hum Genet 1989; 83:359-63. [PMID: 2807276 DOI: 10.1007/bf00291381] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [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: 01/02/2023]
Abstract
An iso 12p chromosome from a patient with Pallister-Killian syndrome was successfully transferred into a mouse background by microcell-mediated chromosome transfer. The presence of the i(12p) chromosome was confirmed by karyotyping and by Southern blotting using five 12p and seven 12q probes. The isochromosome nature of the marker chromosome was confirmed by co-hydridization of a 12p probe with a 12q and an 8q probe. This cell line should be a valuable tool for physical mapping of 12p-derived DNA fragments; at the same time, it confirms the identity of the extra chromosome in the Pallister-Killian syndrome as i(12p).
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Affiliation(s)
- J Zhang
- Center for Human Genetics, University of Leuven, Belgium
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10302
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Abstract
Transcription by RNA polymerase II occurs after formation of a transcription complex. This complex is assembled in stages by the interaction of transcription factors with the template and/or with each other. We report on the ability of six drugs to inhibit the assembly of the RNA polymerase II transcription complex. Assembly of the complex on the adenovirus major late promoter requires several transcription factors. The normal assembly process requires that the DNA first interact with TFIIA, then with TFIID, and finally with at least four additional transcription factors (one of which is RNA polymerase II). We observed that streptolydigin (10 micrograms/ml) inhibits association of ILA and IID, and at higher concentrations (100 micrograms/ml) inhibits that IIA/IID complex from binding to DNA. Streptovaricin (100 micrograms/ml) appears to inhibit the IIA/IID interaction with DNA and prevents reinitiation (at 500 micrograms/ml). Adriamycin (1 microgram/ml) inhibits the interaction of TFIID with the IIA/DNA complex and inhibits an additional event immediately prior to, or during, elongation. Daunorubicin may be an elongation inhibitor. Heparin at 10 micrograms/ml inhibits further assembly after the IIA/IID/DNA complex has formed, and at 100 micrograms/ml also inhibits a late event in the assembly process and blocks reinitiation. Rifamycin AF/013 (100 micrograms/ml) inhibits the early events necessary to form the IIA/IID/DNA complex and (at 10 micrograms/ml) an assembly event following formation of the IIA/IID/DNA complex. Therefore, these compounds should be useful as probes for further examination of the assembly process.
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Affiliation(s)
- K Logan
- Biology Department, University of Massachusetts, Boston 02125
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10303
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Lyras A, Tang X, Lambropoulos P, Zhang J. Radiation amplification through autoionizing resonances without population inversion. Phys Rev A Gen Phys 1989; 40:4131-4134. [PMID: 9902645 DOI: 10.1103/physreva.40.4131] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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10304
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Devriendt K, Zhang J, van Leuven F, van den Berghe H, Cassiman JJ, Marynen P. A cluster of alpha 2-macroglobulin-related genes (alpha 2 M) on human chromosome 12p: cloning of the pregnancy-zone protein gene and an alpha 2M pseudogene. Gene X 1989; 81:325-34. [PMID: 2478422 DOI: 10.1016/0378-1119(89)90193-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [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: 01/01/2023] Open
Abstract
The characterization of two alpha 2-macroglobulin (alpha 2M)-related genomic clones, isolated from two human genomic libraries by use of alpha 2M cDNA [Kan et al., Proc. Natl. Acad. Sci. USA 82 (1985) 2282-2286] as a probe, is reported. Sequence comparison of the clone EPZP6 with the human alpha 2M cDNA revealed the presence of five exons with the proper splice signals. Alignment of the corresponding amino acid (aa) sequence of these exons with the published partial pregnancy-zone protein (PZP) aa sequence (Sottrup-Jensen et al., Proc. Natl. Acad. Sci. USA 81 (1984) 7353-7357] showed a perfect match, thereby identifying EPZP6 as a PZP genomic clone. The clone MPAM16 showed a considerable degree of sequence conservation when compared to the human alpha 2M cDNA sequence, and several putative exons were identified. However, a frame-shift mutation leading to a premature stop codon was found in the coding sequence, classifying this gene as an alpha 2M pseudogene. Human alpha 2M, PZP and the related pseudogene were mapped to the human chromosome 12p12-13, with the help of gene-specific probes and in situ hybridization. This result was confirmed in Southern-blot experiments with DNA from a human-Ltk- mouse somatic-cell hybrid containing only a human isochromosome 12p in a mouse background.
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Affiliation(s)
- K Devriendt
- Center for Human Genetics, University of Leuven, Belgium
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10305
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Abstract
This study examined the effect of antisperm antibodies on sperm motility. Antisperm antibodies present in seminal plasmas with different sperm agglutinating titres were transferred passively to normal donor sperm, and the effects on movement characteristics (velocity of forward progression, amplitude of lateral head displacement, percentage progressive motility and percentage non-progressive motility) were analysed using timed exposure photomicrography. There was no significant association between sperm movement characteristics and the presence of titre of antisperm antibodies in seminal plasma. Furthermore, no differences were detected between those samples that possessed sperm agglutinating versus sperm immobilizing activity. These findings do not support the common belief that antisperm antibodies are a cause of poor sperm motility in semen.
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Affiliation(s)
- A J Adeghe
- Department of Obstetrics & Gynaecology, University of Birmingham, U.K
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10306
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Alexander DR, Schaub SA, Zhang J, Poulain DE, Barton JP. Scattering of incident KrF laser radiation resulting from the laser-induced breakdown of H(2)O droplets. Opt Lett 1989; 14:548-550. [PMID: 19752892 DOI: 10.1364/ol.14.000548] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The time history of elastically scattered incident radiation (ESIR) is presented for 60-microm-diameter water droplets irradiated by KrF (lambda = 248 nm) laser pulses with power densities in the range of 1-200 GW/cm(2). The ESIR shows a distinct two-peak structure that is dependent on the incident irradiance. The time delay between the arrival of the incident pulse and the first local minimum in the ESIR varied from 7 nsec at 200 GW/cm(2) to 21 nsec at 5 GW/cm(2). The time between incident pulse arrival and the first peak in the ESIR showed a similar irradiance dependence, with delays ranging from 4 to 12 nsec. Images of droplet breakup and the average velocities of ejected material are presented for times between 0 and 1000 nsec after the arrival of 3-GW/cm(2) laser pulses.
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10307
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Zhang J, Strauch M, Aronson AI. Glutamine auxotrophs of Bacillus subtilis that overproduce glutamine synthetase antigen have altered conserved amino acids in or near the active site. J Bacteriol 1989; 171:3572-4. [PMID: 2566596 PMCID: PMC210090 DOI: 10.1128/jb.171.6.3572-3574.1989] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [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: 01/01/2023] Open
Abstract
A number of mutations within the Bacillus subtilis glutamine synthetase (GS) gene result in altered catalytic properties and overproduction of the GS antigen. The restriction fragments containing mutations from three such mutants were sequenced, and they all had amino acid changes in conserved residues found either within or near sequences contributing to the active site of the Salmonella typhimurium GS.
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Affiliation(s)
- J Zhang
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907
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10308
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Chen YF, Mai CR, Tie ZJ, Feng ZT, Zhang J, Lu XH, Lu GJ, Xue YH, Pan GZ. The diagnostic significance of carbohydrate antigen CA 19-9 in serum and pancreatic juice in pancreatic carcinoma. Chin Med J (Engl) 1989; 102:333-7. [PMID: 2509154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
CA 19-9 is a carbohydrate antigen isolated from human colon carcinoma cell line, and is reportedly a tumor marker for pancreatic carcinoma. In this study we determined serum CA 19-9 in 71 normal subjects, 103 patients with benign digestive diseases, 85 patients with periampullary cancers, and 160 patients with other digestive cancers. Serum CA 19-9 was elevated only in 2.3% of normals and benign digestive disease patients, whereas it was increased in 72.7%, 86.4%, and 89.5% of pancreatic, ampullary, and choledochal carcinoma patients, respectively. Of other digestive cancer patients, it was elevated in 23.8%. In addition, very high serum CA 19-9 (greater than 120 u/m) was more often observed in patients with pancreatic, ampullary, and biliary cancer patients than in GL cancer patients (54.1% vs 9.4%, p less than 0.001). In 18 normal subjects and 68 patients with benign and malignant diseases, it was found that CA 19-9 content in the pancreatic juice was significantly increased in pancreatic, ampullary, and choledochal cancer patients, whereas in chronic pancreatitis patients it was normal, indicating that it is a specific and valuable tumor marker in differential diagnosis of pancreatic cancer.
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10309
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Marynen P, Zhang J, Cassiman JJ, Van den Berghe H, David G. Partial primary structure of the 48- and 90-kilodalton core proteins of cell surface-associated heparan sulfate proteoglycans of lung fibroblasts. Prediction of an integral membrane domain and evidence for multiple distinct core proteins at the cell surface of human lung fibroblasts. J Biol Chem 1989; 264:7017-24. [PMID: 2523388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Heparitinase treatment of cell surface-associated heparan sulfate proteoglycans (HSPG) of human lung fibroblasts reveals core proteins with apparent Mr values of 125,000, 90,000, 64,000, 48,000 and 35,000 (Lories, V., De Boeck, H., David, G., Cassiman, J.-J., and Van den Berghe, H. (1987) J. Biol. Chem. 262, 854-859). The 90- and 48-kDa core proteins share the epitope of the monoclonal antibody 6G12 which was used to screen a human lung fibroblast expression cDNA library. Rescreening of the libraries yielded clone 48K5 with an insert of 3439 base pairs. Polyclonal antibodies were raised in rabbits against a fragment of the protein encoded by the 48K5 cDNA different from the part carrying the 6G12 epitope. These antibodies specifically recognize the 90- and 48-kDa core proteins on Western blots of total cellular extracts of human lung fibroblast HSPG. The specific reactivity of the polyclonal antiserum confirms the identity of the 48K5 clone and further distinguishes the 48- and the 90-kDa core proteins, which do share the 6G12-defined epitope and at least one additional antigenic determinant with the 48K5 cDNA-encoded protein, from the 125-, 64-, and 35-kDa core proteins of cell surface HSPG of human lung fibroblasts which do not react with either antibody preparation. The protein encoded by the 48K5 clone contains a stop-transfer sequence indicative of an integral membrane protein and three potential glycosaminoglycan attachment sites. The 48K5 clone detects two major poly(A)+ RNA species in human lung fibroblasts presumably generated by the use of alternative polyadenylation signals. The 48K5 gene was mapped to chromosome 8q23 by in situ hybridization and hybridization to DNA of somatic cell hybrids.
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Affiliation(s)
- P Marynen
- Center for Human Genetics, University of Leuven, Belgium
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10310
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Marynen P, Zhang J, Cassiman JJ, Van den Berghe H, David G. Partial Primary Structure of the 48- and 90-Kilodalton Core Proteins oF Cell Surface-Associated Heparan Sulfate Proteoglycans of Lung Fibroblasts. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)83534-7] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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10311
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Zhang J, Liu Y, Xu QZ. [Effect of proglumide on choleresis in rats]. Zhongguo Yao Li Xue Bao 1989; 10:170-3. [PMID: 2816419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We are the first to report that proglumide (PGM) has a marked effect on promoting choleresis in rats. After iv infusion PGM 50, 100, 200, 400 mg/(kg.h), the bile quantities of 120-150 min were 0.4 +/- 0.14, 0.46 +/- 0.11, 0.75 +/- 0.25, 0.87 +/- 0.21 ml/30 min, respectively. They were significantly higher values than either basic bile flow (0.24 +/- 0.06 ml/30 min) or the solvent control of 5% NaHCO3 (0.22 +/- 0.13 ml/30 min, P less than 0.01) and obviously dose-dependent. After ig PGM 200 mg, bile flow observed at the peak of secretion between 60-90 min was 0.67 +/- 0.22 ml/30 min. Compared to that observed before PGM administration, the bile fluid collected was found to have increased 1.7-3.2 times, up to even 7 times. The choleretic effect continued 8-12 h after the infusion was terminated. The secretions of HCO3- and chlorides in the bile also increased during PGM infusion as compared with the control (P less than 0.05-0.01). On the contrary, the concentrations of cholic acids decreased remarkably (P less than 0.05-0.01). It is suggested that the mechanism of choleresis promoted by the infusion of PGM may be cholic acid-independent, but that it is related to the secretion of inorganic salts in cholangiole. Compared with three other choleretics commonly used clinically, phenylpropanol, dehydrocholic acid and sodium taurocholate, the effect of PGM is significantly superior (P less than 0.01).
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10312
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Gheng G, Wei ZL, Jiang WG, Zhang J, An CR, Feng ZC. Metabolism of n-VLDL and beta-VLDL in peritoneal macrophages from diabetic mice. J Tongji Med Univ 1989; 9:53-7. [PMID: 2527308 DOI: 10.1007/bf02933745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Peritoneal macrophages were harvested from both healthy mice and mice with diabetes induced by intravenous injection of streptozotocin. After incubation with normal plasma very low density lipoprotein (n-VLDL) from swine for 24 h, the content of triglyceride (TG) in macrophages from diabetic mice was higher than that in the controls, and it was the same with the concentration of free fatty acid (FFA) in medium. The basic concentration of cholesterol ester (ChE) in macrophages from diabetic mice was also higher than that of the controls. After incubation with beta-VLDL from hypercholesterolemic rabbit for 48 h, no alteration in ChE content was found in the cells. On the contrary, the content of ChE in the cells from the controls was accumulated by saturating. The levels of FFA in the medium of the diabetic group were still higher than those of the controls. These results demonstrated that the metabolic function of peritoneal macrophages in diabetic mice was altered. The uptake and degradation of n-VLDL and the endogenous cholesterol synthesis were increased, but the uptake of beta-VLDL was lower. In this paper, the possible mechanism and the relationship between atherosclerosis and diabetes are discussed.
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10313
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Zhang J, Garrett JD. Observation of diabolical points in rapidly rotating nuclei. Phys Rev Lett 1989; 62:693. [PMID: 10040307 DOI: 10.1103/physrevlett.62.693] [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: 05/23/2023]
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10314
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Abstract
The amino acid sequence of a presynaptic neurotoxin, agkistrodotoxin (ATX) isolated from the venom of Agkistrodon halys Pallas, was determined by automated Edman degradation and the carboxypeptidase digestion of the S-carboxymethylated ATX and by sequence analyses of peptides produced with cyanogen bromide cleavage and with trypsin or staphylococcal V8 protease digestion of the S-carboxymethylated ATX. ATX consists of 122 amino acid residues, including the histidine residue and 14 half-cystine residues. The amino acid sequence of ATX is very similar to those of toxic phospholipases and the phospholipase subunits of presynaptic neurotoxins from snake venoms. The residues responsible for the toxic activity of the presynaptic neurotoxins are discussed.
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Affiliation(s)
- K Kondo
- Department of Medical Chemistry, Osaka Medical College
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10315
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Han J, Sayeh M, Zhang J. Convergence and limit points of neural network and its application to pattern recognition. ACTA ACUST UNITED AC 1989. [DOI: 10.1109/21.44039] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10316
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Zhang J, Lu JM, Huang ZJ. Inhibitory effects of atropine on growth hormone release in normal subjects and acromegaly. Chin Med J (Engl) 1989; 102:45-7. [PMID: 2504552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Growth hormone (GH) secretion is mediated by hypothalamic factors, mainly growth hormone releasing factor (GRF) and somatostatin (SS). The hypothalamic hormones, under direct neurotransmitter control, stimulate GH secretion through different central mechanisms. Atropine, an anticholinergic agent, can cross the blood-brain barrier and inhibit GH secretion stimulated by exercise and sleep in normal persons. In order to study the inhibiting effect of atropine on GH release and whether glucose can be replaced by atropine, normal persons and acromegaly patients were observed during exercise, after atropine, and 100 g glucose loading. The results confirmed that GH secretion increases after exercise and that this GH elevation can be inhibited by atropine in normal subjects. But in acromegaly patients high basal GH levels can not be inhibited by 100 g glucose loading or 0.6 mg atropine during the active phase of the disease. Blood sugar levels remained unchanged during the atropine test. It is suggested that the atropine test can be used as a GH inhibitory test in acromegaly patients with overt diabetes.
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10317
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Zhang J, Hemschoote K, Peeters B, De Clercq N, Rombauts W, Cassiman JJ. Localization of the PRR1 gene coding for rat prostatic proline-rich polypeptides to chromosome 10 by in situ hybridization. Cytogenet Cell Genet 1989; 52:197-8. [PMID: 2630192 DOI: 10.1159/000132877] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The gene coding for rat ventral prostatic proline-rich polypeptides (PRR1) was mapped to chromosome region 10q26----q31 by in situ hybridization. The high percentage (40%) of specific hybridization signal obtained is probably the result of the highly repetitive structure of the PRR1 gene.
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Affiliation(s)
- J Zhang
- Center for Human Genetics, University of Leuven, Belgium
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10318
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Liu JZ, Gao QS, Jiang Z, Liang CC, Yang KG, Wu GY, Long GF, Li Q, Zhang J, Deng B. Studies of beta-thalassemia mutations in families living in three provinces in southern China. Hemoglobin 1989; 13:585-95. [PMID: 2606726 DOI: 10.3109/03630268908993109] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
beta-Thalassemia is a common disease in Southern China and 10 different mutations or frameshifts are responsible for most types of beta-thalassemia in this area. We studied 126 chromosomes of 80 beta-thalassemia patients from the Guangxi, Guangdong, and Sichuan Provinces using the polymerase chain reaction followed by dot-blot hybridization with specific oligonucleotide probes. The most common mutation in the three provinces is the frameshift at codons 41-42, followed by the A----T mutation at codon 17. The A----G mutation at nt -29 of the promoter is common in Sichuan but not in the other two provinces. Three mutations (T----C at nt -30; G----T at IVS-I-1, and G----C at IVS-I-5) were not observed. These data were used to initiate a prenatal diagnosis program using the same techniques for identification. Eleven fetuses at risk for beta-thalassemia have been diagnosed.
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Affiliation(s)
- J Z Liu
- Institute of Basic Medical Sciences, Chinese Academy of Medical Science, P.R
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10319
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Lledo PM, Legendre P, Zhang J, Israel JM, Vincent JD. Dopamine affects two voltage-dependent K+ currents of identified rat lactotroph cells. Pflugers Arch 1989; 414 Suppl 1:S160-1. [PMID: 2780243 DOI: 10.1007/bf00582282] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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10320
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Ding Z, Mai Z, Zhang J, Xiang Y, Yu A. Transplantation of cryopreserved murine fetal liver cells for the treatment of lethally irradiated injuries. Cryobiology 1988. [DOI: 10.1016/0011-2240(88)90484-1] [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: 11/30/2022]
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10321
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Bao C, Zhang J, Wang S. Dual-frequency phase conjugation wave generation with the high-order nonlinear effect by nondegenerate six-wave mixing in photorefractive Fe:LiNbO(3). Appl Opt 1988; 27:4572-4577. [PMID: 20539610 DOI: 10.1364/ao.27.004572] [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
This paper demonstrates dual-frequency phase conjugation waves via the high-order nonlinear effect by nondegenerate six-wave mixing in iron-doped lithium niobate. In the experiment, two conjugation waves of different frequency are generated. Conjugation wave 1 is similar to nondegenerate four-wave mixing; conjugation wave 2 is completely different. The experiments measure the relationships between two conjugation wave intensities and parameters, respectively, and compare the differences of the two conjugation waves. To explain the experimental results, we assume that there is a fifth-order nonlinear interaction in crystal, and we believe the two conjugation waves are generated via different level nonlinear interactions. The theory agrees with the experimental results.
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10322
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Wang F, Zhang YY, Zhang MF, Zhang JD, Gu JW, Zhang J, Zhou L, Wu PC, Liu YK, Dai ZY. Netilmicin. Laboratory and clinical studies. Chin Med J (Engl) 1988; 101:776-80. [PMID: 3150713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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10323
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Zhang J. [A study of the contents of vasoactive intestinal peptide, somatostatin and neurotensin in rectal mucosa in patients with inflammatory bowel disease]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1988; 10:365-7. [PMID: 2908180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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10324
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Abstract
The significant role of secreted ATP in the regulation of neuronal function and the activity of ecto-protein kinases which utilize extracellular ATP to phosphorylate proteins localized at the cell surface have been previously studied in peripheral neurons and in cloned neural cell lines. In the present study we have utilized neostriatal neurons differentiated in primary culture to demonstrate vesicular secretion of ATP and phosphorylation of proteins by extracellular ATP in neurons derived from the central nervous system (CNS). Neostriatal neurons from embryonic mice were maintained in a chemically defined medium for 15-18 days. Functional differentiation was determined by measuring evoked GABA-release. ATP-secretion was measured by luciferin-luciferase assays, and protein phosphorylation by adding gamma-32P-ATP to the extracellular medium. Depolarization by 50 mM KCl induced a Ca++-dependent ATP release, and stimulation by 100 microM veratridine resulted in secretion of ATP that could be blocked by tetrodotoxin. Phosphorylation of specific protein components with apparent molecular mass of 110 Kd, 80 Kd, 55 Kd, 30 Kd and 20 Kd was detected in striatal neurons incubated for 15 min with gamma-32P-ATP added to the medium, but not by labeling intracellular ATP pools with equivalent amounts of radioactivity presented as inorganic 32Pi. These results open for investigation the role of extracellular protein phosphorylation systems in processes underlying the responsiveness of CNS neurons to secreted ATP.
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Affiliation(s)
- J Zhang
- Department of Psychiatry, University of Vermont, College of Medicine, Burlington 05405
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10325
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Zhang J, Xu YY. [Blood volume determination in normal pregnancy and pregnancy-induced hypertension]. Zhonghua Fu Chan Ke Za Zhi 1988; 23:258-61, 316. [PMID: 3250803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10326
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Zhang J, Liu YJ, MacLennan IC, Gray D, Lane PJ. B cell memory to thymus-independent antigens type 1 and type 2: the role of lipopolysaccharide in B memory induction. Eur J Immunol 1988; 18:1417-24. [PMID: 2458943 DOI: 10.1002/eji.1830180918] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.5] [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: 01/01/2023]
Abstract
Several studies have indicated that thymus-independent (TI) antigens, unlike their thymus-dependent (TD) counterparts, are poor at generating memory antibody responses (Immunol. Today 1981. 3:217). In contrast to this view, the present report shows that the TI type 1 (TI-1) antigen, 2,4,6-trinitrophenyl-lipopolysaccharide (TNP-LPS), elicits good secondary responses in rats. These secondary antibody responses are not only greater in magnitude than the primary responses, but display a different pattern of Ig classes with more IgG and IgA antibodies produced. In transfer experiments between congenic strains of rats which differ in their kappa light chain Ig allotype, it is shown that this memory is attributable to persistent B cell clones. The TI-2 antigen, 2,4-dinitrophenyl-hydroxyethyl starch (DNP-HES), given alone did not elicit B cell memory. However, when DNP-HES is presented to the immune system in association with LPS, the pattern of the anti-DNP response is similar to that elicited by TNP-LPS. The capacity to generate TI memory is associated with the appearance of hapten-specific B cells in the marginal zones of the spleen. Hapten-binding cells were induced in the marginal zones following immunization with TNP-LPS, but not by DNP-HES. However, concurrent immunization with DNP-HES and LPS which were not covalently linked was found to induce DNP-binding cells in the marginal zone. There is complete correlation between the appearance of hapten-binding memory B cells in the marginal zone and the capacity of these antigens to induce secondary responses.
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Affiliation(s)
- J Zhang
- Department of Immunology, University of Birmingham Medical School, Edgbaston, GB
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10327
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Abstract
Antigen-reactive B cells accumulate mutations in the variable (v) regions of their immunoglobulin genes during certain phases of T cell-dependent (TD) antibody responses. This is associated with a rise in the affinity of specific antibody. The time when somatic mutations are accumulating seems to coincide with the presence of germinal centres. This has led to the suggestion that a mechanism leading to a high rate of base pair substitution in immunoglobulin v region genes might operate in centroblasts in germinal centres. The rate of accumulation of mutations in v region genes is likely to relate to the number of specific B cells in cycle and their rate of cell division. The present report provides evidence pointing to centroblasts having a remarkably short cell cycle time of some 6 to 7 hours. This rapid rate of proliferation may explain the clonal expansion which occurs in the early phase of TD antibody responses and the efficiency with which high affinity mutants are subsequently selected.
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Affiliation(s)
- J Zhang
- Department of Immunology, The Medical School, Birmingham, U.K
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10328
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Zhang J, Ulloa SE. Depletion regions and electronic surface states in doped semiconductor superlattices. Phys Rev B Condens Matter 1988; 38:2063-2067. [PMID: 9946494 DOI: 10.1103/physrevb.38.2063] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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10329
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Paul ES, Ma R, Beausang CW, Fossan DB, Piel WF, Shi S, Xu N, Zhang J. Deformation-driving properties of the nu i13/2. Phys Rev Lett 1988; 61:42-45. [PMID: 10038689 DOI: 10.1103/physrevlett.61.42] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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10330
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Lei KY, Rosenstein F, Shi F, Hassel CA, Carr TP, Zhang J. Alterations in lipid composition and fluidity of liver plasma membranes in copper-deficient rats. Proc Soc Exp Biol Med 1988; 188:335-41. [PMID: 2969111 DOI: 10.3181/00379727-188-42743] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In view of the importance of membrane fluidity on cell functions, the influence of phospholipid acyl groups on membrane fluidity, and the changes in lipid metabolism induced by copper (Cu) deficiency, this study was designed to examine the influence of dietary Cu on the lipid composition and fluidity of liver plasma membranes. Male Sprague-Dawley rats were divided into two dietary treatments, namely Cu deficient and Cu adequate. After 8 weeks of treatment, liver plasma membranes were isolated by sucrose density gradient centrifugation. The lipid fluidity of plasma membranes, as assessed by the intramolecular eximer fluorescence of 1,3-di(1-pyrenyl) propane, was significantly depressed by Cu deficiency. In addition, Cu deficiency significantly reduced the content of arachidonic and palmitoleic acids but increased the docosatetraenoic and docosahexaenoic acids of membrane phospholipids. This alteration in unsaturated phospholipid fatty acid composition, especially the large reduction in arachidonic acid, may have contributed to the depressed membrane fluidity. Furthermore, Cu deficiency also markedly altered the fatty acid composition of the triacylglycerols associated with the plasma membranes. Thus, the lipid composition and fluidity of liver plasma membranes are responsive to the animal's Cu status.
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Affiliation(s)
- K Y Lei
- Department of Nutrition and Food Science, University of Arizona, Tucson 85721
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10331
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Zhang J. [Masticatory efficiency of the Chinese adolescent]. Zhonghua Kou Qiang Yi Xue Za Zhi 1988; 23:144-6. [PMID: 3208592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10332
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Liu WC, Zhang J, Zhang YM, Pei TF. Acupuncture treatment of functional uterine bleeding--a clinical observation of 30 cases. J TRADIT CHIN MED 1988; 8:31-3. [PMID: 3393017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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10333
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Pan GZ, Zhang J, Cai Q. [A follow-up study of surgically treated 66 cases of Crohn's disease]. Zhonghua Nei Ke Za Zhi 1988; 27:159-61, 197. [PMID: 3219932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10334
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Joyce BA, Zhang J, Neave JH, Dobson PJ. The application of RHEED intensity effects to interrupted growth and interface formation during MBE growth of GaAs/(Al, Ga)As structures. ACTA ACUST UNITED AC 1988. [DOI: 10.1007/bf00615013] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10335
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Bao C, Zhang J, Wang S. Frequency-varied conjugation wave generation via nondegenerate four-wave mixing in Fe:LiNbO(3) crystal. Appl Opt 1988; 27:652-654. [PMID: 20523654 DOI: 10.1364/ao.27.000652] [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
This paper demonstrates the frequency-varied conjugation wave generation via nondegenerate four-wave mixing in photorefractive iron-doped lithium niobate crystal. The experiment uses 4880- and 6328-A laser beams as mixing waves. The results are different from nearly degenerate four-wave mixing. The conjugation wave intensity depends on many parameters.
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10336
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Wan XS, Xu SJ, Guo XZ, Zhang J. [Pharmacognostical studies on the root of Rubia cordifolia var. pratensis Nakai and R. sylvatica Nakai]. Zhong Yao Tong Bao 1988; 13:7-9, 61. [PMID: 3416391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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10337
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Zhang J, Roberts P, Ellis J. An application of expert systems techniques to the on-line control and fault diagnosis of a mixing process. J INTELL ROBOT SYST 1988. [DOI: 10.1007/bf00238766] [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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10338
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Culpepper-Morgan J, Kreek MJ, Holt PR, LaRoche D, Zhang J, O'Bryan L. Orally administered kappa as well as mu opiate agonists delay gastrointestinal transit time in the guinea pig. Life Sci 1988; 42:2073-7. [PMID: 2838706 DOI: 10.1016/0024-3205(88)90120-8] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
When an orally administered opiate agonist is systemically bioavailable, the relative activity of that opioid in delaying gastrointestinal transit (GIT) depends on its relative action at central and peripheral sites. This in turn depends on the density of opioid receptor specific subtypes at those sites of action in the species under study. In rats the kappa selective agonist U-50,488H has no effect on GIT. We have found that this same agonist is equipotent to mu agonists morphine and 1-methadone in delaying the orocecal transit of a charcoal meal when administered orally to guinea pigs. Thus, both kappa as well as mu receptor subtypes are involved in the mechanisms of opiate induced slowing of GIT in the guinea pig in contrast to the rat. Interspecies differences must be considered when determining the contribution of opiate receptor subtypes to the mechanisms of opiate-induced constipation.
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10339
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Abstract
A relationship between Hb Bart's levels in cord blood and the number of alpha-globin genes has been established by screening cord blood samples from 1,075 newborn babies. Diagnosis was made by gene mapping of DNA samples with restriction endonuclease digestion. The presence of Hb Bart's was determined with a discontinuous microelectrophoresis on cellulose acetate at pH 8.34. The establishment of this relationship allows an early diagnosis of alpha-thalassemia by this simple microelectrophoretic procedure.
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Affiliation(s)
- W Zhao
- Department of Pediatrics, Children's Hospital of Chongqing, University of Medical Science, Sichuan, P.R. China
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10340
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Zhang J, Dirckx L, Marynen P, Rombauts W, Delaey B, Van den Berghe H, Cassiman JJ. Mapping of rat prostatic binding protein genes C1, C2, and C3 to rat chromosome 5 by in situ hybridization. Cytogenet Cell Genet 1988; 48:121-3. [PMID: 3197450 DOI: 10.1159/000132604] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Rat prostatic binding protein genes C1, C2, and C3 were mapped on rat chromosome 5 by in situ hybridization on rat peripheral blood chromosome preparations using three different cDNA probes. Of the grains detected, 15.9%, 25.2%, and 19.6%, respectively, mapped to chromosome 5. For each probe, the label was predominantly located on 5q31, but for C2 and C3 an additional site on 5q21 was found. The results suggest that three genes coding for the different polypeptide chains of rat prostatic binding protein map to the same chromosome and presumably to the same chromosome band.
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Affiliation(s)
- J Zhang
- Center for Human Genetics, University of Leuven, Belgium
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10341
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Yang G, Zhang J, Gong J, Chen J, Ho Y. Optical sine transformation. Appl Opt 1987; 26:4433-4437. [PMID: 20523380 DOI: 10.1364/ao.26.004433] [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 phase mask distribution of optical sine transformation (OST) has been calculated according to the optical general transformation theory. To avoid the diffraction loss of the phase mask, the optical waveguide method is used. Computation shows that the optical sine transformation is possible with only one phase mask, i.e., one-half of a cylindrical lens in the 1-D case and one-quarter of a spherical lens in the 2-D case. Experimental results agree with the theoretical prediction. Image compression by OST is also given.
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10342
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Walro DS, Herzog NK, Zhang J, Lim MY, Bose HR. The transforming protein of avian reticuloendotheliosis virus is a soluble cytoplasmic protein which is associated with a protein kinase activity. Virology 1987; 160:433-44. [PMID: 2821682 DOI: 10.1016/0042-6822(87)90015-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [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: 01/02/2023]
Abstract
We have identified the product (p57v-rel) of the transforming gene, v-rel, of avian reticuloendotheliosis virus (REV-T) using antisera generated against nonoverlapping sequences representing the middle and carboxy-terminal regions of the v-rel protein expressed in Escherichia coli (N.K. Herzog and H.R. Bose, Jr., 1986, Proc. Natl. Acad. Sci. USA 83, 812-816). The amino-terminal region of the v-rel protein was also expressed in E. coli and used to generate antisera. The immunoglobulin-enriched fractions of these antisera were used to determine the subcellular location of p57v-rel in REV-T transformed lymphoid cells. Cells were fractionated into nuclear, mitochondrial, microsomal, and cytoplasmic fractions. The majority of p57v-rel was found in the cytoplasm. Examination of REV-T transformed lymphoid cells labeled with 32Pi revealed that the majority of the phosphorylated form of the v-rel protein was also found in the cytoplasm. Indirect immunofluorescence of REV-T transformed cells gave a diffuse cytoplasmic pattern indicating that p57v-rel was not associated with any discrete cellular organelle. The distribution of p57v-rel was similar in REV-T transformed lymphoid cells labeled with [35S]methionine for short and long periods of time, suggesting that p57v-rel is a soluble cytoplasmic protein throughout its lifetime. The v-rel protein was phosphorylated when immune complexes precipitated from transformed cells with the immunoglobulin fractions obtained from antisera against the amino-terminal, middle, and carboxy-terminal regions of v-rel were incubated with [gamma-32P]ATP and Mn2+. The phosphorylation of p57v-rel in the in vitro immune complex kinase assay was inhibited when the immunoglobulin-enriched fraction of these antisera was preincubated with the homologous v-rel fusion proteins. Preincubation with heterologous proteins did not block the phosphorylation of p57v-rel. These observations suggest that p57v-rel is associated with a protein kinase activity. Most of the kinase activity was found in the soluble cytoplasmic fraction of transformed cells. The transforming protein encoded by v-rel is a relatively stable protein with a half-life of approximately 7 to 8 hr in transformed lymphoid cells.
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Affiliation(s)
- D S Walro
- Department of Microbiology, University of Texas at Austin 78712
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10343
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Lou ZC, Gao CY, Lin FT, Lin MC, Zhang J, Slatkin DJ, Schiff PL. Quaternary Alkaloids of Thalictrum glandulosissimum. Planta Med 1987; 53:498-9. [PMID: 17269078 DOI: 10.1055/s-2006-962784] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- Z C Lou
- School of Pharmacy, Beijing Medical University, Beijing 100083, People's Republic of China
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10344
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10345
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Huang ZL, Cui ZM, Ren Y, Zhang J. [Effects of the roots of Hedysarum polybotrys Hand.-Mazz. on animal anoxia]. Zhong Yao Tong Bao 1987; 12:43-7, 63-4. [PMID: 3449253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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10346
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Zhang J, Neave JH, Dobson PJ, Joyce BA. Effects of diffraction conditions and processes on rheed intensity oscillations during the MBE growth of GaAs. ACTA ACUST UNITED AC 1987. [DOI: 10.1007/bf00616570] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.6] [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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10347
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Zhang J, Huether G, Neuhoff V. Acceleration of brain tubulin formation in the optic lobe of the chick embryo by light stimulation. Neurochem Res 1987; 12:331-4. [PMID: 3600960 DOI: 10.1007/bf00993240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The effect of light exposure on the protein patterns of optic lobe and forebrain of the chick embryo was analysed by a high-resolution micro-two-dimensional polyacrylamide gel electrophoresis and computerized quantitation. Experiments were done on three groups of eggs: control group was incubated in the dark; simultaneously, in the same incubator, one group of eggs was illuminated by constant light, another by intermittent light (3 sec interval) from day 10 to day 16 of incubation. In embryos exposed to intermittent light the relative amount of tubulins was significantly increased in the optic lobe. In the frontal lobe no effect of light exposure on the concentration of tubulins was seen. The rise of tubulins in the optic lobe was only caused by intermittent light. Continuous illumination of the eggs for the same period under otherwise identical incubation conditions was ineffective.
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10348
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Wu YY, Zhang J, Huang YR, Yu ZH, Zuo DP, Liu FQ, Zhao XY. [Effect of diseases on interleukin 2 production]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1987; 9:133-4. [PMID: 2955926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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10349
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Zhang J, Mai ZG, Ding ZH. [Mobilization of granulocyte-macrophage colony-forming cells (CFU-GM) into the peripheral blood of the mouse by Ch. violaceum endotoxin]. Sheng Li Xue Bao 1987; 39:61-7. [PMID: 3603064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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10350
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Zhang J, Huether G, Neuhoff V. Regional protein patterns of the embryonic chick brain: developmental shifts and the effects of light stimulation. Int J Dev Neurosci 1987; 5:151-65. [PMID: 2459904 DOI: 10.1016/0736-5748(87)90061-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 01/01/2023] Open
Abstract
The developmental changes in the regional protein patterns of the embryonic brain of chick were analysed by micro-two-dimensional polyacrylamide gel electrophoresis stained by a highly sensitive procedure with Coomassie Brilliant Blue G-250 that completely avoids background staining. More than 400 protein spots were resolved in a computerized plot. Many proteins of the various embryonic brain regions varied with age. At least six of these proteins changed remarkably during development. One of them (Mr 14K) was prominent at 6 days and disappeared after 12 days of incubation. One acidic protein (Mr 30K) appeared at 12 days together with two acidic protein spots near tubulin and increased with development. A group of more basic proteins (Mr 94K) was prominent at 6 day incubation and decreased during development. One more basic protein (Mr 20K) was first observed at 18 days of incubation in the metencephalon. It was identified as myelin basic protein, and strikingly increased in all brain regions until hatching. A group of basic proteins with high molecular weight (Mr 94K) appeared at day 12 of incubation, and increased remarkably before hatching. They were identified to be collagen associated with brain capillary vessels. Stimulation by intermittent light in ovo from day 10 to day 16 caused a retarded appearance of these collagen proteins, and an increased formation of tubulin in the optic lobe of the developing chick embryo.
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Affiliation(s)
- J Zhang
- Max-Planck-Institute for Experimental Medicine, Department of Neurochemistry, Gottingen, F.R.G
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