1201
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Schmidt MC, Zhou Q, Berk AJ. Sp1 activates transcription without enhancing DNA-binding activity of the TATA box factor. Mol Cell Biol 1989; 9:3299-307. [PMID: 2677669 PMCID: PMC362374 DOI: 10.1128/mcb.9.8.3299-3307.1989] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
We have studied the interactions of the Sp1 and IID transcription factors with a simple RNA polymerase II promoter. The adenovirus E1B core promoter consists essentially of a GC box and a TATA box, binding sites for the Sp1 and IID transcription factors, respectively. The E1B promoter is accurately transcribed in vitro using a mammalian transcription system. Sp1 activates E1B transcription in vitro in reactions using IID factor isolated from either human or yeast cells. In DNase I footprinting studies, Sp1 bound rapidly to its recognition sequence even at 0 degrees C (t1/2 less than 1 min). In contrast, yeast IID bound more slowly (t1/2 approximately 6 min at 25 degrees C) and required thermal energy for stable binding to the TATA box sequence. Dissociation rates were measured by the addition of specific oligonucleotide competitors to preformed DNA-protein complexes. Sp1 dissociates rapidly (t1/2 less than 1 min) at 25 degrees C, while yeast IID dissociates with an estimated t1/2 of 1 h at 25 degrees C. Sp1 and yeast IID bound to the E1B promoter simultaneously but independently. The rates of binding and dissociation of these factors were not significantly affected by the presence of the other factor. Bound Sp1 factor did not alter or enhance the yeast IID footprint. Oligonucleotide challenge of in vitro transcription reactions indicated that Sp1 also did not enhance the binding of the human IID factor to the E1B promoter. Thus the Sp1 factor activates transcription of the E1B gene by a mechanism that does not enhance the DNA-binding activity of the IID factor. Sp1 factor activates E1B transcription by 5- to 10-fold in vitro. Under these in vitro transcription conditions, transcripts due to reinitiation from an individual promoter complex contribute only a small portion of the total yield of E1B transcripts. Thus Sp1 cannot activate transcription by increasing the rate of initiation events per complex. Instead it appears that Sp1 acts by increasing the number of productive transcription complexes formed in vitro.
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1202
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Zhou Q, Kritz D, Bonnell L, Sigel GH. Porous plastic optical fiber sensor for ammonia measurement. APPLIED OPTICS 1989; 28:2022-2025. [PMID: 20555459 DOI: 10.1364/ao.28.002022] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A porous plastic optical fiber has been developed for use in chemical gas sensing. This porous plastic waveguide, which was made with copolymer materials, has an interconnective porous structure as well as uniformity of pore size. These sensors are based on in-line optical absorption within the porous plastic fiber core and have much greater sensitivities than sensors based on evanescent coupling to a surrounding medium. Furthermore, this fiber simultaneously exhibits very high gas permeability and liquid impermeability. This combination makes the fiber particularly suitable for gas concentration measurements in aqueous samples. An ammonia gas sensor has been tested to demonstrate the effectiveness of this porous plastic waveguide.
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1203
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Wang JM, Wen GY, Zhang ZR, Wu XL, Jiang DH, Tao L, Cao RQ, Zhou Q. The entry of gossypol across the blood-testis barrier in rats. Contraception 1989; 39:569-75. [PMID: 2721201 DOI: 10.1016/0010-7824(89)90112-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This paper presents the experimental data about how different formulations of gossypol enter the blood-testis barrier following intravenous administration in acute experiments on rats. It was found that gossypol encapsulated by liposomes crossed the blood-testis barrier more readily than free gossypol, without affecting its pharmacokinetic pattern in the circulating blood, suggesting that liposomes may be useful as drug carriers and may facilitate the entry of encapsulated gossypol into the seminiferous tubule from the blood.
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1204
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Li WY, Tang L, Zhou Q, Qin M, Hu TS. Attenuation of phosphoinositidase activity and phosphatidylinositol bisphosphate level of bovine retinal capillary pericytes in high glucose. Exp Eye Res 1989; 48:99-106. [PMID: 2537745 DOI: 10.1016/0014-4835(89)90023-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Both phosphoinositidase (PIase) and individual species of inositol phospholipid (IPL) of bovine retinal capillary pericytes (BRCP) were quantitatively determined. When glucose in growth medium was increased from 5- to 15- or 30 mM, PIase activity was attenuated to 82% or 55%, respectively. In contrast, when glucose (5-, 15-, 30 mM) was added to an enzyme extract from cells grown in the standard growth medium (5 mM glucose, 0.04 mM myo-inositol) the PIase activity was not changed, indicating that the reduced PIase activity was not due to the direct effect of glucose. When IPLs from BRCP were analysed by HPLC and TLC, we observed reduction of the total and newly formed IPLs including the substrate of PIase. Phosphatidylinositol bisphosphate (PIP2). Reduced levels of IPLs were associated with a decrease in myo-inositol and an increase in sorbitol. The changes in IPL metabolism were reversed by adding either free myo-inositol or AL1576, an aldose reductase inhibitor (ARI), to the high-glucose medium. However, the addition of myo-inositol to the growth medium with a standard concentration of glucose only caused a marked increase in phosphatidylinositol, but not in PIP or PIP2, while the supplement of AL1576 in the standard medium did not cause any changes in IPL formation. These findings suggest that the alteration in IPL metabolism in BRCP may be related to insufficient myo-inositol or activated sorbitol pathway under high-glucose conditions. Further explanation of the role of the altered hydrolysis of PIP2 triggered by PIase may provide clues to understanding of the mechanism of decreased pericyte viability in the presence of high glucose concentrations.
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1205
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A˚gren G, Zhou Q, Zhong W. Ecology and social behaviour of Mongolian gerbils,Meriones unguiculatus, at Xilinhot, Inner Mongolia, China. Anim Behav 1989. [DOI: 10.1016/0003-3472(89)90002-x] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1206
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Yu FT, Zhou Q, Zhang C. Multiple channel optical correlator via rotating grating on LCTV. APPLIED OPTICS 1988; 27:3770-3772. [PMID: 20539455 DOI: 10.1364/ao.27.003770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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1207
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Zhou Q, Tong MR, Yang K. Mechanism of pressor effects of angiotensin II microinjected into the fourth ventricle of rabbits. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1988; 8:164-8. [PMID: 2852726 DOI: 10.1007/bf02887841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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1208
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Shahriari MR, Zhou Q, Sigel GH. Porous optical fibers for high-sensitivity ammonia-vapor sensors. OPTICS LETTERS 1988; 13:407-409. [PMID: 19745914 DOI: 10.1364/ol.13.000407] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new porous glass optical fiber has been developed for use as a sensor for the detection of ammonia vapors at low concentrations. The porous structure that remains after selective heat treatment, phase separation, and chemical leaching of a borosilicate glass imparts a high surface area to the fiber core. Ammonia vapors permeating into the porous zone, which is pretreated with a reversible pH dye indicator, produce a spectral change in transmission. The resulting pH change is measured by in-line optical absorbance and is proportional to the ambient-ammonia concentration. Ammonia-vapor concentrations as low as 0.7 part in 10(6) have been detected.
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1209
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Zhou Q, Tong MR, Yang K. [Mechanism of pressor effects of angiotensin II injected into the fourth ventrical of rabbits]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1988; 40:185-90. [PMID: 3201269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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1210
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Wu XM, Zhang BG, Zhou Q, Li BR. [Effect of putrescine on experimental acute hepatic injury in rats]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1988; 23:161-7. [PMID: 3421104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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1211
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Li WY, Zhou Q, Qin M, Hu TS. Reduction of inositol triphosphate in retinal microvessels by glucose and restimulation by myo-inositol. Exp Eye Res 1987; 45:517-24. [PMID: 2828091 DOI: 10.1016/s0014-4835(87)80062-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The formation of inositol phospholipids (IPLs) and inositol phosphate esters (IPEs) in response to glucose was studied in isolated retinal microvessels from porcine eyes. Retinal microvessels incubated from 60 hr with myo-[3H]inositol were sequentially extracted to obtain IPLs and IPEs. [3H]Inositol-labelled IPLs were deacylated to produce the corresponding glycero derivatives. Both deacylation products and water-soluble IPEs were monitored by anion-exchange chromatography. In the presence of high glucose (30 mM) the labelling in inositol triphosphate (IP3) was reduced to 77% and was restimulated by adding myo-inositol (final concentration 0.4 mM) to 158% of the control under physiological conditions of glucose (5 mM) and myo-inositol (0.04 mM). With a fixed glucose concentration (5 mM), IPE accumulation was observed with increasing concentrations of exogenous myo-inositol. Under physiological conditions (glucose 5 mM, myo-inositol 0.04 mM) the distribution (percentage) of radioactivity in phosphatidylinositol (PI), phosphatidylinositol 4-phosphate (PIP) and phosphatidylinositol 4,5-phosphate (PIP2) was 63:19:18. The myo-inositol concentration dependence of IPL formation was also demonstrated. A decrease in IP3 in response to high glucose without changing PIP2 but with a reduction in PI indicated that PI may act as a reservoir to replace a possible loss of PIP2. These findings suggest that availability of myo-inositol by retinal microvessels may be essential to maintain the normal signal transduction and cell proliferation associated with IPL turnover under high glucose concentration.
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1212
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Zhou Q. [Progress in the study of gastric duodenal ulcer perforation treated with traditional Chinese medicine combined with Western medicine]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1987; 7:506-8. [PMID: 3436019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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1213
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Zhu XM, Wang SZ, Zhou Q, Yang MF, Ma HZ, Liu GD, Hu XF, Lian LJ, Liu WS, Xia ZM. [Radioimmunoimaging of AFP-producing tumors, CEA-producing tumors and ovarian cancers]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1987; 9:140-3. [PMID: 2440596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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1214
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Li M, Sun ZL, Lei YD, Zhou Q, Ruan HF, Wu JX. [Preliminary studies of the enzymologic properties of terminal deoxynucleotidyl transferase and its clinical application]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1986; 17:176-9. [PMID: 3470249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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1215
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Yang K, Mei CL, Zhou Q, Jia YF, Yu CG. Investigation on the hemodynamic alterations and their mechanism during heat stroke under hot environment. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1986; 6:48-52. [PMID: 2940373 DOI: 10.1007/bf02911618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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1216
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Chen WC, Zhou Q, Wang HR, Chen G, Tang Y, Pu QX, Wang ZS, Liang ZJ. [Effects of low magnesium and magnesium-free solutions on action potentials of isolated right ventricular muscle cell in the guinea pig]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1985; 37:96-100. [PMID: 4095553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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1217
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Zhou Q. [The application of electronic computers in processing population census data]. REN KOU YAN JIU = RENKOU YANJIU 1983:23-7. [PMID: 12312934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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1218
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Zhou Q, Xiong Y. [Some understandings about the population development of the minorities in China]. REN KOU YAN JIU = RENKOU YANJIU 1982:33-7. [PMID: 12159329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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1219
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Zhou Q. [Practising planned birth and carrying out the education of transforming social traditions]. REN KOU YAN JIU = RENKOU YANJIU 1981:50-4. [PMID: 12159359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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1220
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Yang MF, Zhou Q, Lu CQ. [Thyroid radioiodine uptake studies in schoolagers and adolescents using iodine-132 (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1981; 3:50-2. [PMID: 6458394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1221
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Zhou Q, Cai QQ, Wang WJ. [Analysis of brain scans in 118 cases of intracranial space-occupying lesions (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1981; 3:18-22. [PMID: 6458387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1222
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Cai QQ, Zhou Q, Shi JM. [Preliminary evaluation of the differential diagnosis between malignant and benign thyroid nodules by radionuclide scanning and B-mode ultrasound (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1981; 3:27-30. [PMID: 6458389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1223
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Zhou Q. [On some theoretic issues about planned control of population]. REN KOU YAN JIU = RENKOU YANJIU 1981:39-43. [PMID: 12159326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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1224
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Lin FD, Zhou Q. [Shift the focus of family-planning work to one couple giving birth to one child--an investigative report on family-planning conditions in Shifang County]. REN KOU YAN JIU = RENKOU YANJIU 1980:54-9. [PMID: 12311028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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