826
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Wu K, Li S, Chen S, Guo H. Comparative studies of the carbohydrate of human gamma-crystallins from fetal and adult lenses with agglutinins. YAN KE XUE BAO = EYE SCIENCE 1992; 8:108-10. [PMID: 1303865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Using gel chromatography of Sephadex G-75 superfine connected with Sephadex G-50 fine column, three human gamma-crystallins (gamma 1, gamma 2, gamma 3) could be obtained. Seven agglutinins (LCA, SBA, DBA, PNA, BSL, RCA and UEA) were used to detect the sugar of sub-gamma-crystallins, which had been transferred to nitrocellulose membrane and finally stained with ABC reagents and the substrate of HPR. These results suggested that gamma 2- and gamma 3-crystallins contain sugar, but gamma 1-crystallin has no sugar. There is a decrease of carbohydrate of gamma 2 and gamma 3 as the development of the lens (esp. the former). It was postulated that in gamma-crystallins (gamma 2, gamma 3) the sugar components helped stabilizing the molecular structure (folding polypeptide, prevent protein breaking). The sugar components decreased with age by the post-translation modification.
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827
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Guo H, Hong DC, Kurtze DA. Dynamics in pattern-forming systems. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:1867-1874. [PMID: 9908323 DOI: 10.1103/physreva.46.1867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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828
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Wang J, Wang YJ, Guo H. Ballistic-electron transport through a coupled-quantum-wire system. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:2420-2427. [PMID: 10003916 DOI: 10.1103/physrevb.46.2420] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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829
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Sekiguchi M, Shimai K, Guo H, Nowakowski RS. Cytoarchitectonic abnormalities in hippocampal formation and cerebellum of dreher mutant mouse. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 1992; 67:105-12. [PMID: 1638738 DOI: 10.1016/0165-3806(92)90030-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The laminated structures in the hippocampal formation and cerebellum of homozygous dreher mice were compared to their littermates and to C57BL/6J mice in Nissl- and myelin-stained preparations. In the dreher dentate gyrus, ectopic granule cells were situated in the molecular layer, and frequently there was either partial or complete absence of the infrapyramidal limb of the granule cell layer. In the dreher hippocampus, the cells of the pyramidal cell layer in area CA3 formed widely dispersed arrangements, and there were ectopically situated pyramidal cells in the stratum radiatum and stratum oriens. In the dreher cerebellum, 3 abnormal patterns were observed: (1) disruptions of foliation with normal cytoarchitectonic structure, (2) foliation with a mixture of normal laminated structure and abnormal laminated structure, and (3) almost complete absence of the cerebellum. In abnormal folia exhibiting the second or third pattern, islands consisting of agglomerations of both granule cells and Purkinje cells or just granule cells were observed. The neuronal heterotopias and cytoarchitectonic disorganization observed in the present study are apparently secondary to disruption of cell proliferation and neuronal migration produced directly or indirectly by the dreher mutation. In addition, the fact that the phenotypic abnormalities in homozygous dreher mice produces different abnormal morphologies in different specimens may be useful for analyzing the development of the hippocampal formation and cerebellum.
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830
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Zhang Z, Laradji M, Guo H, Mouritsen OG, Zuckermann MJ. Phase behavior of pure lipid bilayers with mismatch interactions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:7560-7567. [PMID: 9906830 DOI: 10.1103/physreva.45.7560] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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831
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Guo H, Sekiguchi M, Shimai K. Cytoarchitectonic abnormalities in cerebellum and hippocampal formation of beige mutant mouse. THE TOKAI JOURNAL OF EXPERIMENTAL AND CLINICAL MEDICINE 1992; 17:53-61. [PMID: 1523694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Abnormalities in the cerebellum and hippocampal formation of the beige mouse were revealed by histological and immunohistochemical examination. In the cerebellum, Purkinje cells and clusters of granule cells, plus an occasional Bergmann glia cell, were located ectopically in the molecular layer. In the hippocampus, ectopically situated pyramidal cell were found in the stratum oriens of area CA3. The infrapyramidal mossy fiber layer (IPMFL) was formed by fiber bundles emerging from two districtly separated areas of the dentate gyrus. The IMPFL was not compact, but appeared as clumps of scattered fiber bundles. The neuronal heterotopias and cytoarchitectonic disorganization observed in the beige mutant mouse cerebellum and hippocampus may prove to be very useful parameters in analyzing the relationship between the immune system and the development of the central nervous system.
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832
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Yao JH, Elder KR, Guo H, Grant M. Ostwald ripening in two and three dimensions. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:8173-8176. [PMID: 10000642 DOI: 10.1103/physrevb.45.8173] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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833
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Yao JH, Roland C, Guo H. Interfacial dynamics with long-range screening. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:3903-3912. [PMID: 9907439 DOI: 10.1103/physreva.45.3903] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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834
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Guo H, Lorenz RR, Vanhoutte PM. Anisodamine antagonizes acetylcholine-induced inhibition of adrenergic neurotransmission in the canine saphenous vein. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1992; 7:32-5. [PMID: 1330075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The effect of anisodamine, an alkaloid structurally related to atropine and isolated from a Chinese herb, on adrenergic neurotransmission was studied using isolated canine saphenous veins. Helical strips of vein were incubated in modified physiological salt solution containing L-(7- 3H)-norepinephrine (3 x 10(-7) mol/L) for two hours and then mounted for isometric tension recording and superfusion. Increases in isometric tension and efflux of total tritiated compounds and 3H-norepinephrine evoked by electrical stimulation were inhibited by acetylcholine (10(-6) mol/L). This effect of acetylcholine was antagonized to comparable levels by anisodamine (10(-6) mol/L) or atropine (10(-6) mol/L). The results demonstrate that anisodamine blocks prejunctional muscarinic receptors.
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835
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Thomson JR, Guo H, Ryan DH, Zuckermann MJ, Grant M. Magnetic ordering in the three-dimensional frustrated Heisenberg model. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:3129-3132. [PMID: 10001871 DOI: 10.1103/physrevb.45.3129] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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836
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Guo H, Gelfand SB. Classification trees with neural network feature extraction. ACTA ACUST UNITED AC 1992; 3:923-33. [PMID: 18276489 DOI: 10.1109/72.165594] [Citation(s) in RCA: 101] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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837
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Bertram JS, Hozzain MZ, Zhang LX, Guo H. 93. Retinoids up-regulate expression of connexion 43 in human and mouse cells: implication for growth control and differentiation. Pharmacotherapy 1992. [DOI: 10.1016/0753-3322(92)90178-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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838
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Laradji M, Guo H, Grant M, Zuckermann MJ. Phase diagram of a lattice model for ternary mixtures of water, oil, and surfactants. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:8184-8188. [PMID: 9905970 DOI: 10.1103/physreva.44.8184] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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839
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Lin T, Guo H, Calkins JH, Wang D, Chi R. Recombinant monocyte-derived interleukin-1 receptor antagonist reverses inhibitory effects of interleukin-1 on Leydig cell steroidogenesis. Mol Cell Endocrinol 1991; 78:205-9. [PMID: 1838083 DOI: 10.1016/0303-7207(91)90124-b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Previously we have reported that interleukin-1 (IL-1) is a potent inhibitor of Leydig cell function. Most recently, IL-1 receptor antagonist (IL-1ra) has been purified, sequenced and cloned. In the present study, we evaluated the recombinant monocyte-derived IL-1ra on the inhibitory effects of IL-1. The addition of recombinant human IL-1ra up to 1000 ng/ml has no discernible effects on human chorionic gonadotropin (hCG)-stimulated testosterone formation in primary cultures of rat Leydig cells. Similar to that reported previously, IL-1 beta caused a dose-dependent inhibition of hCG-induced testosterone. The inhibitory effect of IL-1 beta could be reversed by the concomitant addition of IL-1ra. The amounts of IL-1ra required to reverse the effect of IL-1 were 25-fold higher. Our results suggest that IL-1 is important in modulating Leydig cell function and its effect most likely is mediated by specific IL-1 receptors.
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840
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Roland C, Guo H. Interface growth with a shadow instability. PHYSICAL REVIEW LETTERS 1991; 66:2104-2107. [PMID: 10043392 DOI: 10.1103/physrevlett.66.2104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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841
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Grossmann B, Guo H, Grant M. Kinetic roughening of interfaces in driven systems. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:1727-1743. [PMID: 9905213 DOI: 10.1103/physreva.43.1727] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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842
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Van Speybroeck R, Guo H, Van der Eycken J, Vandewalle M. Enantioselective total synthesis of (−)-epipodophyllotoxin and (−)-podophyllotoxin. Tetrahedron 1991. [DOI: 10.1016/s0040-4020(01)86473-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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843
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Guo H, Gelfand S. Analysis of gradient descent learning algorithms for multilayer feedforward neural networks. ACTA ACUST UNITED AC 1991. [DOI: 10.1109/31.85630] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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844
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Marshall TK, Guo H, Price DH. Drosophila RNA polymerase II elongation factor DmS-II has homology to mouse S-II and sequence similarity to yeast PPR2. Nucleic Acids Res 1990; 18:6293-8. [PMID: 2243775 PMCID: PMC332494 DOI: 10.1093/nar/18.21.6293] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
DmSII is a Drosophila RNA polymerase II elongation factor which suppresses pausing by RNA polymerase II at specific sites on double stranded templates. Using antibodies produced against the purified protein, a Drosophila cDNA expression library was screened and a cDNA was isolated which encoded a portion of DmSII. When this cDNA was used to probe Kc cell mRNA the predominant species was found to be 1.4 kb in length. The original cDNA was used to screen a Drosophila Kc cell cDNA library resulting in the isolation of a 1.4 kb cDNA which was then sequenced. The deduced protein sequence for DmSII exhibited high similarity to mouse SII protein sequence. In addition, significant sequence similarity was found with the protein encoded by the yeast gene PPR2, which is involved in regulation of URA4 gene expression. The comparison of amino acid sequences suggests that DmSII is comprised of two domains homologous to mouse SII separated by a flexible, serine rich region of low homology. The shorter yeast protein has sequence similarity only to the carboxy terminal domain.
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845
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Lin T, Wang DL, Calkins JH, Guo H, Chi R, Housley PR. Regulation of insulin-like growth factor-I messenger ribonucleic acid expression in Leydig cells. Mol Cell Endocrinol 1990; 73:147-52. [PMID: 2269394 DOI: 10.1016/0303-7207(90)90127-t] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In the present study, we evaluated insulin-like growth factor-I (IGF-I) messenger RNA expression in the rat testis. Crude interstitial cells were separated into three distinct bands on 15-60% Percoll density gradients. IGF-I mRNA was mainly localized in the Leydig cell-enriched fraction (band 3), while band 1 and band 2 cells did not contain significant amounts of IGF-I mRNA. Leydig cell IGF-I mRNA consisted of multiple species varying from 0.8 to 7.5 kb and was present in rat Leydig cells all ages examined, from 25 to 55 days old. To further document that IGF-I mRNAs are present in Leydig cells, the method of Klinefelter et al. (Biol. Reprod. (1987) 36, 769-783) was used to isolate highly purified (greater than 98% pure) Leydig cells. Most of the IGF-I mRNA was localized in these Leydig cells, while there was no detectable IGF-I mRNA in the whole testis or other interstitial cells. Furthermore, IGF-I mRNA in Leydig cells was increased more than 2-fold by growth hormone (GH) administration in vivo. This suggests that IGF-I mRNA in Leydig cells is also GH dependent. Interstitial IGF-I produced in Leydig cells may have both autocrine and paracrine effects in the testis.
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846
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Abstract
Interstitial tissue of the testis consists of Leydig cells, macrophages, lymphocytes, plasma cells, mast cells and fibroblasts. Previously we have reported that interleukin-1 (IL-1) inhibits Leydig cell androgen production. In the present study, the effect of IL-2 was investigated. Leydig cells (10(5) cells/ml) from adult Sprague-Dawley rats were cultured with or without IL-2 for 24 h. After medium changes, human CG (hCG), 8-bromo-cAMP, or forskolin was added with or without IL-2. Cultures were continued for an additional 24 h, and testosterone and cAMP levels were measured. IL-2 up to 100 U/ml had no effect on basal testosterone production. hCG-stimulated testosterone formation was inhibited in a dose-dependent manner by the addition of IL-2. IL-2 in a concentration of 100 U/ml decreased hCG-induced testosterone formation from 49.6 +/- 3.6 ng/ml (mean +/- SE) to 8.5 +/- 4.2 ng/ml. The hCG dose-response curve was shifted to the right by the addition of IL-2. Maximal testosterone production in response to hCG was reduced 40% in the presence of IL-2 (50 U/ml) without alteration of median effective dose (ED50). IL-2 also inhibited hCG-induced cAMP formation and 8-bromo cAMP- and forskolin-stimulated testosterone production. However, IL-2 did not alter the binding of [125I]hCG to purified Leydig cells. Furthermore, IL-2 significantly inhibited the conversion of 20-OH-cholesterol, 22-OH-cholesterol, pregnenolone, progesterone, 17 alpha-hydroxypregnenolone, and 17 alpha-hydroxyprogesterone to testosterone but did not alter the conversion of dehydroepiandrosterone and androstenedione to testosterone. Our results suggest that a T cell growth factor, IL-2, is a potent inhibitor of steroidogenesis. IL-2 may play a paracrine role in modulating Leydig cell function.
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847
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Kass SR, Guo H, Dahlke GD. The thiomethyl anion: Formation, reactivity, and thermodynamic properties. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 1990; 1:366-371. [PMID: 24248898 DOI: 10.1016/1044-0305(90)85016-f] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/1990] [Accepted: 04/10/1990] [Indexed: 06/02/2023]
Abstract
The thiomethyl anion (1) has been generated by fluorodesilylation of trimethylsilylmethanethiol in a variable-temperature flowing afterglow device. The proton affinity (1649 ± 12 kJ mol(-1)) and electron affinity (0.67 ± .13 eV) were determined and compared to a previously reported molecular orbital calculation. Isomerization via a 1,2-proton shift does not take place between -40° and 100°C despite a 156 kJ mol(-1) driving force. Ion-molecule reactions of 1 were examined with a number of reagents including N20, O2, CS2, COS, and CO2, Hydride ion transfer was observed in every case, along with other products, and thermodynamic information has been derived.
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848
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Guo H, Grossmann B, Grant M. Crossover scaling in the dynamics of driven systems. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 41:7082-7085. [PMID: 9903136 DOI: 10.1103/physreva.41.7082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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849
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Grossmann B, Guo H, Grant M. Monte Carlo renormalization-group study of self-organized criticality. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 41:4195-4198. [PMID: 9903613 DOI: 10.1103/physreva.41.4195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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850
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