151
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Hua R, Ou G, Wu S, Li J, Cao J, Zhang H, Chen D, Feng Q, Zhou Z, Zhang X, Wang L. Phase II Study of Cisplatin/Etoposide vs. Weekly Paclitaxol/Carboplatin with Radiotherapy for Patients with Locally Advanced Non-small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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152
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He H, Emmett MR, Marshall AG, Ji Y, Conrad CA, Priebe W, Colman H, Lang FF, Madden TL, Kristoffersen K, Stockhausen MT, Poulsen HS, Binder ZA, Orr B, Lim M, Weingart JD, Brem H, Olivi A, Riggins GJ, Gallia GL, Litofsky NS, Miller DC, Rath P, Anthony DC, Feng Q, Franklin C, Pei L, Free A, Kirk MD, Shi H, Timmer M, Theiss H, Juerchott K, Ries C, Paron I, Franz W, Selbig J, Guo K, Tonn JC, Schichor C, Zhou YH, Hu Y, Pioli PD, Rajneesh K, Limoli CL, Yu L, Hess KR, Linskey ME, Faber F, Guo K, Jaeger D, Thorsteinsdottir J, Albrecht V, Tonn JC, Schichor C, Price R, Song J, Zimmerman P, Duale H, Rivera A, Kaur B, Parada L, Cook C, Chiocca EA, Kwon CH, Munoz DM, Guha A, Estrada-Bernal A, Van Brocklyn JR, Gu C, Mahasenan KV, Joshi K, Gupta S, Mattson A, Li C, Nakano I, Chi AS, Rheinbay E, Wakimoto H, Gillespie S, Kasif S, Rabkin SD, Martuza RL, Bernstein BE, Skirboll SL, Wurdak H, Zhu S, Romero A, Lorger M, Watson J, Chiang CY, Zhang J, Natu VS, Lairson LL, Walker JR, Trussell CM, Harsh GR, Vogel H, Felding-Habermann B, Orth AP, Miraglia LJ, Rines DR, Schultz PG, Hide T, Takezaki T, Nakamura H, Makino K, Kuratsu JI, Kondo T, Yao J, Kim YW, Koul D, Almeida JS, Weinstein JN, Alfred Yung WK, Joshi K, Miyazaki T, Chaudhury AR, Nakano I, Wong AJ, Del Vecchio C, Mitra S, Han SY, Holgado-Madruga M, Gupta P, Golebiewska A, Brons NH, Bjerkvig R, Niclou SP, Ramm P, Vollmann-Zwerenz A, Beier C, Aigner L, Bogdahn U, Kalbitzer HR, Hau P, Sanzey M, Golebiewska A, Vallar L, Niclou SP, Tamura K, Aoyagi M, Ando N, Ogishima T, Wakimoto H, Yamamoto M, Ohno K, Perin A, Fung KH, Longatti P, Guiot MC, Del Maestro RF, Rossi S, Stechishin O, Weiss S, Stifani S, Goodman L, Gao F, Gumin J, Ezhilarasan R, Love P, George A, Colman H, Lang F, Aldape K, Sulman EP, Soeda A, Lee DH, Shaffrey ME, Oldfield EH, Park DM, Dietrich J, Han R, Noble M, Yang MY, Liu X, Madhankumar AB, Sheehan J, Slagle-Webb B, Connor JR, Fu J, Shen RJ, Colman H, Lang FF, Alfred Yung WK, Koul D, Kaluzova M, Machaidze R, Nduom ENK, Burden CT, Hadjipanayis CG, Lei L, Sonabend A, Guarnieri P, Ludwig T, Rosenfeld S, Bruce J, Canoll P, Vaillant BD, Bhat K, Balasubramaniyam V, Wang S, Gumin J, Sulman E, Lang F, Aldape K, Colman H, Sulman EP, Ezhilarasan R, Goodman LD, Love PN, George A, Aldape K, Soules M, Zhu T, Flack C, Talsma C, Hamm L, Muraszko K, Fan X, Aoyagi M, Matsuoka Y, Tamura K, Ando N, Kawano Y, Ohno K, Kobayashi D, Kumagai J, Frank RT, Najbauer J, Aboody KS, Aboody KS, Najbauer J, Metz M, Garcia E, Aramburo S, Valenzuela V, Gutova M, Annala AJ, Barish M, Danks M, Kim SU, Portnow J, Hofstetter C, Gursel D, Mubita L, Holland E, Boockvar J, Monje M, Freret M, Masek M, Edwards MS, Fisher PG, Vogel H, Beachy P. Stem Cells. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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153
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Lixia Y, Feng Q, Ruiwei G, Xianmei W, Chuanming G. e0436 Clinical Study on Relationship between the Plasma LTB4 levels and Unstable plaque in Acute Coronary Syndrome. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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154
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Lixia Y, Feng Q, Ruiwei G, Xianmei W, Chuanming G. e0437 The changes and significance of combined detection MCP1 and RANTES chemotactic factors in patients with acute coronary syndrome. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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155
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Lixia Y, Feng Q, Ruiwei G, Xianmei W, Chuanming G. e0667 The role of RANTES factor in the study of hyperglycemia and coronary heart disease. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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156
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Lixia Y, Feng Q, Ruiwei G, Xianmei W, Chuanming G. e0378. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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157
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Lixia Y, Feng Q, Ruiwei G, Xianmei W, Chuanming G. e0379 Study of correlationship between myeloperoxidase paraoxonase and coron. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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158
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Feng Q, Yin Y, Hua X, Zhu R, Hua J, Xu J. Prospective ECG triggering versus low-dose retrospective ECG-gated 128-channel CT coronary angiography: comparison of image quality and radiation dose. Clin Radiol 2010; 65:809-14. [DOI: 10.1016/j.crad.2010.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2009] [Revised: 04/24/2010] [Accepted: 05/07/2010] [Indexed: 10/19/2022]
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159
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Feng Q, He JX, Ni CY, Ni YM. Isolated Congenital Left Ventricular Diverticulum. Thorac Cardiovasc Surg 2010; 58:374-6. [DOI: 10.1055/s-0030-1250026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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160
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Feng Q, Gao T, Ji H, Jiang X, Liang T, Gu W, Wu G, Gao G, Wang W. Kinetic analysis of oxytetracycline residues in Chinese mitten crab, Eriocheir sinensis, muscle following intramuscular administration. JOURNAL OF FISH DISEASES 2010; 33:639-647. [PMID: 20561141 DOI: 10.1111/j.1365-2761.2010.01168.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Crab culture is a very important economic industry in China. An epidemic of tremor disease of Chinese mitten crabs, Eriocheir sinensis, has become a serious problem in recent years. A spiroplasm has been proved to be the causative agent of this disease. Oxytetracycline (OTC) is used widely in aquaculture and was confirmed to be very effective against this pathogen. In this study, the distribution and depletion patterns of OTC in crab muscle were evaluated following single intramuscular doses of 2, 8 and 40 mg kg(-1) body weight. OTC was detected with a validated HPLC method. Concentration-time profiles were well described by a three-compartment model with first-order absorption after a single dose of 8 and 40 mg kg(-1). For comparison, a non-compartment model was employed. A withdrawal time of 48.29 and 55.92 days was suggested prior to consumption after receiving 8 and 40 mg kg(-1). A recommended therapeutic dose of OTC in theory was calculated to be 36.37 mg kg(-1). OTC was distributed well throughout the body. The elimination of OTC in muscle was slower compared with fish and other crustaceans. A dose of 40 mg kg(-1) is suggested for practical use.
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161
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Hong JI, Feng Q, Rotello V, Rebek J. Competition, cooperation, and mutation: improving a synthetic replicator by light irradiation. Science 2010; 255:848-50. [PMID: 17756433 DOI: 10.1126/science.255.5046.848] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Replication and mutation are necessary elements of evolution, and some properties of self-replicating molecules (replicators) can be explored with synthetic structures. Selection and evolution at the molecular level require systems capable of competition and inheritable change. These phenomena have now been observed with synthetic molecules. Two such molecules were prepared having sufficient structural similarity that they catalyzed each other's formation as well as their own. One of the replicators bears a photochemically active function that is cleaved on irradiation. The resulting species is more effective at replication than the original and rapidly takes over the system's resources.
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162
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Feng Q, Wu S, Yu G. Surgical treatment of a 56-year-old woman with an intracardiac type of total anomalous pulmonary venous connection. Thorac Cardiovasc Surg 2010; 58:175-6. [PMID: 20376729 DOI: 10.1055/s-0029-1185390] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Total anomalous pulmonary venous connection (TAPVC) is a rare congenital cardiac anomaly. Death usually occurs in the first 3 months of life in about 50% of neonates with this disease, and no more than 20% of patients survive to the age of 1 year. The patient with the longest recorded survival is 49 years old. Here, we report successful surgical treatment of this disease in a 56-year-old female patient. This patient was discharged in good health about 1 month after operation, with no evidence of recurrence of heart failure at 13 months' follow-up.
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163
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Ye M, Tang J, Feng Q. O1027 Peritoneal vaginoplasty with laparoscopic assistance. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)61400-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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164
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Holmes RS, Hawes SE, Toure P, Dem A, Feng Q, Weiss NS, Kiviat NB. HIV Infection as a Risk Factor for Cervical Cancer and Cervical Intraepithelial Neoplasia in Senegal. Cancer Epidemiol Biomarkers Prev 2009; 18:2442-6. [DOI: 10.1158/1055-9965.epi-08-0956] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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165
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Sun XY, Hedner T, Feng Q, Edvinsson L. Inhibition of Endothelin (ET-1) Induced Pressor Responses by the Endothelin (ETA) Receptor Antagonist FR139317 in the Pithed Rat. Blood Press 2009; 1:108-12. [PMID: 1366258 DOI: 10.3109/08037059209077501] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The effects of the novel ETA receptor antagonist, FR 139317, on ET-1 induced blood pressure changes were studied in the pithed Sprague-Dawley rat. FR139317 in a dose of 0.025 mg/kg b.w. had no effect while 0.05-1 mg/kg b.w. dose dependently inhibited the pressor response to an i.v. bolus injection of ET6-1 (800 pmoles/kg). While FR139317 potently inhibited the magnitide and duration of the ET-1 induced pressor response, the ETA antagonist did not significantly influence the shortlasting initial depressor response. We conclude that FR139317 in the pithed rat potently inhibits ET-1 mediated pressor responses and that this agent may become a significant tool to elucidate the putative physiological and pathophysiological role of ETA receptor mediated responses.
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166
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Li Y, Li Y, Feng Q, Arnold M, Peng T. Calpain activation contributes to hyperglycaemia-induced apoptosis in cardiomyocytes. Cardiovasc Res 2009; 84:100-10. [DOI: 10.1093/cvr/cvp189] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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167
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Fang Z, Wang Q, Cao W, Feng Q, Li C, Xie L, Zhang R. Investigation of phosphorylation site responsible for CaLP (P. fucata) nucleo-cytoplasmic shuttling triggered by overexpression of p21Cip1. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2009; 11:270-279. [PMID: 18818969 DOI: 10.1007/s10126-008-9142-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2008] [Accepted: 08/26/2008] [Indexed: 05/26/2023]
Abstract
Calmodulin (CaM) is a highly conserved and ubiquitous Ca(2+)-binding protein regulating intracellular Ca(2+) concentration by acting as a sensor of this divalent cation in eukaryotic cells. Being such a very important signal sensor, CaM is susceptible to undergo many posttranslational modifications. One of these important modifications is its phosphorylation. Our previous investigations showed that CaM and calmodulin-like protein (CaLP) cloned from Pinctada fucata have many different characteristics in spite of their high similarity to each other. We have narrowed down that the C-terminal domains of CaM and CaLP are responsible for their discrepant subcellular localizations and shuttling of CaLP when it is co-transfected with p21(Cip1), which is commonly considered as an important cell cycle regulating protein. In this study, we first predicted the potential phosphorylation site responsible for the shuttling and confirmed by fluorescence confocal microscopy. Together with fluorescence activated cell sorter analysis, we further investigated the releasing ability of wild type and point mutated CaLP from arrested cell cycle caused by p21(Cip1) overexpression. By performing pull-down analysis and phosphorylation status of CaLP in cytoplasm fraction of transfected COS-7 cells with CaLP alone and phosphorylation status of CaLP in nuclear fraction of co-transfected COS-7 cells with CaLP and p21(Cip), we propose that the CaLP staying in the cytoplasm is in the state of phosphorylation, but when p21(Cip1) is overexpressed in mammalian cells, some signal triggers CaLP dephosphorylation and translocation into the nucleus.
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168
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Burger D, Xenocostas A, Feng Q. Molecular Basis of Cardioprotection by Erythropoietin. Curr Mol Pharmacol 2009; 2:56-69. [DOI: 10.2174/1874467210902010056] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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169
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Peng T, Zhang T, Lu X, Feng Q. JNK1/c-fos inhibits cardiomyocyte TNF- expression via a negative crosstalk with ERK and p38 MAPK in endotoxaemia. Cardiovasc Res 2008; 81:733-41. [DOI: 10.1093/cvr/cvn336] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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170
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Su YH, Zhu GF, Feng Q, Li ZZ, Zhang FP. Environmental isotopic and hydrochemical study of groundwater in the Ejina Basin, northwest China. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s00254-008-1534-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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171
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Feng Q, Ma L, Gabrielle G, Yu GW. Use of Video-Assisted Thoracoscopy Surgery for the Treatment of Aspergillus Empyema with Bronchopleural Fistula. Thorac Cardiovasc Surg 2008; 56:370-2. [DOI: 10.1055/s-2007-989332] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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172
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Yan J, Feng Q, Liu H, Fu G, Liu Y. Expression of tPA, LH receptor and inhibin alpha, beta(A) subunits during follicular atresia in rats. SCIENCE IN CHINA. SERIES C, LIFE SCIENCES 2008; 42:583-90. [PMID: 18726480 DOI: 10.1007/bf02881575] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/1999] [Indexed: 11/30/2022]
Abstract
By using DNA 3'-end labeling, immunocytochemistry and mRNA in situ hybridization detection techniques, the expression of inhibin subunits and LH receptor in the granulosa cells and tissue-type plasminogen activator (tPA) in the oocytes has been studied in relation to follicular development and atresia. The results demonstrated that: (i) tPA activity in the oocytes of normal developing follicles is undetectable, and increases significantly in the follicle undergoing atresia; (ii) the production of inhibin subunits in granulosa cells is negatively correlated with the expression of oocyte tPA activity, indicating that they may be an important regulator of oocyte tPA production and follicular development; (iii) in atretic follicles, granulosa cells do not express LH receptor and inhibin subunits. It is therefore suggested that tPA may play a role in oocyte self-destruction and clearance in some of atretic follicles, and inhibin of granulosa-origin might be an inhibitory factor for the translation of tPA in the oocyte.
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173
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Nazina TN, Pavlova NK, Ni F, Shestakova NM, Ivoĭlov VS, Feng Q, Dongyun Z, Prusakova TS, Beliaev SS, Ivanov MV. [Regulation of geochemical activity of microorganisms in a petroleum reservoir by injection of H2O2 or water-air mixture]. MIKROBIOLOGIIA 2008; 77:370-379. [PMID: 18683655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In the course of pilot trials of biotechnologies for the enhancement of oil recovery in the Gangxi bed of the Dagang oil field (China), microbiological processes were investigated. The biotechnologies were based on injection into the petroleum reservoir of different oxygen sources (H2O2 solution or a water-air mixture) with nitrogen and phosphorus salts. The injection of water-air mixture with nitrogen and phosphorus salts resulted in an increase in the number of aerobic and anaerobic organotrophic bacteria, rates of sulfate reduction and methanogenesis in formation water and also the content of CO2 (from 4.8-12 to 15-23.2%) and methane (from 86-88 to 91.8%) in the gas. The preferential consumption of isotopically light bicarbonate by methanogens resulted in a higher content of the light 12C in methane; the delta13C/CH4 value changed from -45.1...-48.3 to -50.7...-59.3 per thousand). At the same time, mineral carbonates of the formation water became isotopically heavier; the delta13C/Sigmacarbonates value increased from 3.4...4.0 to 5.4...9.6 per thousand. Growth of hydrocarbon-oxidizing bacteria was accompanied by production of biosurfactants and decreased interfacial tension of formation water. Injection of H2O2 solution resulted in the activation of aerobic processes and in suppression of both sulfate reduction and methanogenesis. Methane content in the gas decreased from 86-88 to 75.4-79.8%, probably due to its consumption by methanotrophs. Due to consumption of isotopically light methane, the residual methane carbon became heavier, with the delta13C/CH4 values from -39.0 to -44.3 per thousand. At the same time, mineral carbonates of the formation water became isotopically considerably lighter; the delta13C/Sigmacarbonates value decreased from 5.4... 9.6 to -1.4...2.7 per thousand). The additional amount of oil recovered during the trial of both variants of biotechnological treatment was 3819 t.
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174
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Agarwal AK, Xu T, Jacob MR, Feng Q, Li XC, Walker LA, Clark AM. Genomic and genetic approaches for the identification of antifungal drug targets. Infect Disord Drug Targets 2008; 8:2-15. [PMID: 18473903 DOI: 10.2174/187152608784139613] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Understanding how novel antifungal compounds work in target cells is useful not only in facilitating the discovery of new drugs but also new tools that can be used for further exploration of the targeted biological pathways and their regulation. Various genomic and genetic technologies have been developed in the model yeast Saccharomyces cerevisiae, and have been successfully used to identify drug target pathways. This review discusses the methods developed for some of these technologies, and how they have been used to evaluate the cellular pathways affected by a variety of therapeutic drugs and inhibitors. The advantages and disadvantages of each method are considered, and new advances are highlighted where applicable. The investigation of the mechanism of action of new antifungal compounds will undoubtedly lead to the development of new antifungal therapies targeting new fungal pathways that are more specific and less toxic than currently available antifungal drugs.
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175
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Ng'ayo MO, Bukusi E, Rowhani-Rahbar A, Koutsky LA, Feng Q, Kwena ZA, Holmes KK. Epidemiology of human papillomavirus infection among fishermen along Lake Victoria Shore in the Kisumu District, Kenya. Sex Transm Infect 2008; 84:62-6. [DOI: 10.1136/sti.2007.027508] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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176
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Peng T, Shen E, Fan J, Zhang Y, Arnold JMO, Feng Q. Disruption of phospholipase C 1 signalling attenuates cardiac tumor necrosis factor- expression and improves myocardial function during endotoxemia. Cardiovasc Res 2007; 78:90-7. [DOI: 10.1093/cvr/cvm100] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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177
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Li R, Ni Y, Feng Q, Luo W. Dynamic block of disc valve - blocking of aortic disc prosthesis due to protrusion of mitral prosthesis into the left ventricular outflow tract. Thorac Cardiovasc Surg 2007; 55:469-70. [PMID: 17902076 DOI: 10.1055/s-2006-955945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A case of blocking of an aortic disc prosthesis after mitral and aortic valve replacement is presented here. A hypothesis of "dynamic block of disc valve" is proposed to try to explain this phenomenon.
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178
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Casey FP, Baird D, Feng Q, Gutenkunst RN, Waterfall JJ, Myers CR, Brown KS, Cerione RA, Sethna JP. Optimal experimental design in an epidermal growth factor receptor signalling and down-regulation model. IET Syst Biol 2007; 1:190-202. [PMID: 17591178 DOI: 10.1049/iet-syb:20060065] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We apply the methods of optimal experimental design to a differential equation model for epidermal growth factor receptor signalling, trafficking and down-regulation. The model incorporates the role of a recently discovered protein complex made up of the E3 ubiquitin ligase, Cbl, the guanine exchange factor (GEF), Cool-1 (beta -Pix) and the Rho family G protein Cdc42. The complex has been suggested to be important in disrupting receptor down-regulation. We demonstrate that the model interactions can accurately reproduce the experimental observations, that they can be used to make predictions with accompanying uncertainties, and that we can apply ideas of optimal experimental design to suggest new experiments that reduce the uncertainty on unmeasurable components of the system.
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179
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Nazina TN, Grigor'ian AA, Shestakova NM, Babich TL, Ivoĭlov VS, Feng Q, Ni F, Wang J, She Y, Xiang T, Luo Z, Beliaev SS, Ivanov MV. [Microbiological investigations of high-temperature horizons of the Kongdian petroleum reservoir in connection with field trial of a biotechnology for enhancement of oil recovery]. MIKROBIOLOGIIA 2007; 76:329-39. [PMID: 17633408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The physicochemical conditions and microbiological characteristics of the formation waters of the Kongdian bed of the Dagang oil field (China) were studied. It was demonstrated that this bed is a high-temperature ecosystem with formation waters characterized by low mineralization. The concentrations of nitrogen and phosphorus compounds, as well as of electron acceptors, are low. Oil and oil gas are the main organic matter sources. The bed is exploited with water-flooding. The oil stratum was inhabited mostly by anaerobic thermophilic microorganisms, including fermentative (10(2)-10(5) cells/ml), sulfate-reducing (0-10(2) cells/ml), and methanogenic (0-10(3) cells/ml) microorganisms. Aerobic bacteria were detected mainly in the near-bottom zone of injection wells. The rate of sulfate reduction varied from 0.002 to 18.940 microg S(2-) l(-1) day(-1) and the rate of methanogenesis from 0.012 to 16.235 microg CH4 l(-1) day(-1). Microorganisms with great biotechnological potential inhabited the bed. Aerobic thermophilic bacteria were capable of oxidizing oil with the formation of biomass, the products of partial oxidation of oil (volatile acids), and surfactants. During growth on the culture liquid of oiloxidizing bacteria, methanogenic communities produced methane and carbon dioxide, which also had oil-releasing capabilities. Using various labeled tracers, the primary filtration flows of injected solutions at the testing site were studied. Our comprehensive investigations allowed us to conclude that the tested method for microbial enhancement of oil recovery based on the activation of the stratal microflora can be applied in the Kongdian bed horizons.
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180
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Feng Q, Sekula D, Müller R, Freemantle SJ, Dmitrovsky E. Uncovering residues that regulate cyclin D1 proteasomal degradation. Oncogene 2007; 26:5098-106. [PMID: 17310991 DOI: 10.1038/sj.onc.1210309] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Cyclin D1 regulates G1 cell-cycle progression and is aberrantly expressed in carcinogenesis. Proteasomal degradation of cyclin D1 was highlighted as a cancer chemopreventive mechanism. To understand this mechanism better, residues responsible for degradation and ubiquitination of cyclin D1 were investigated. Eighteen lysines in cyclin D1 had single, double or multiple mutations engineered before transfection into BEAS-2B human bronchial epithelial (HBE) cells to evaluate stabilities after all-trans-retinoic acid (RA) or cycloheximide treatments. Specific mutations stabilized cyclin D1, including substitutions of lysines surrounding the cyclin box domain that inhibited RA-mediated degradation and extended the cyclin D1 half-life. Mutation of all cyclin D1 lysines blocked polyubiquitination. N-terminus (but not C-terminus) modification stabilized cyclin D1. Ubiquitination-resistant mutants preferentially localized cyclin D1 to the nucleus, directly implicating subcellular localization in regulating cyclin D1 degradation. Taken together, these findings uncover specific residues conferring ubiquitination of cyclin D1. These provide a mechanistic basis for proteasomal degradation of cyclin D1.
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181
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Heimann K, Peschgens T, Stanzel S, Feng Q, Hörnchen H, Wenzl TG. Kardiorespiratorische Stabilität und Thermoregulation Frühgeborener: Einfluss von Känguruh-Methode, Bauch- und Rückenlage im direkten Vergleich. Z Geburtshilfe Neonatol 2007. [DOI: 10.1055/s-2007-983106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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182
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Wen PH, Feng Q. Crystal structure of (N1E, N2E)-N1, N2-bis(5-hydroxymethyl-2-methyl- 3-oxopyridinio-4-ylmethylene)ethane-1,2-diamine-nickel(II) dihydrochloride, [Ni(C18H22N4O4)]Cl2. Z KRIST-NEW CRYST ST 2006. [DOI: 10.1524/ncrs.2006.0173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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183
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Ao L, Gu X, Feng Q, Wang J, O'Brien PCM, Fu B, Mao X, Su W, Wang Y, Volleth M, Yang F, Nie W. Karyotype relationships of six bat species (Chiroptera, Vespertilionidae) from China revealed by chromosome painting and G-banding comparison. Cytogenet Genome Res 2006; 115:145-53. [PMID: 17065796 DOI: 10.1159/000095235] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2006] [Accepted: 04/25/2006] [Indexed: 11/19/2022] Open
Abstract
The Vespertilionidae is the largest family in the order Chiroptera and has a worldwide distribution in the temperate and tropical regions. In order to further clarify the karyotype relationships at the lower taxonomic level in Vespertilionidae, genome-wide comparative maps have been constructed between Myotis myotis (MMY, 2n = 44) and six vesper bats from China: Myotis altarium (MAL, 2n = 44), Hypsugo pulveratus (HPU, 2n = 44), Nyctalus velutinus (NVE, 2n = 36), Tylonycteris robustula (TRO, 2n = 32), Tylonycteris sp. (TSP, 2n = 30)and Miniopterus fuliginosus (MFU, 2n = 46) by cross-species chromosome painting with a set of painting probes derived from flow-sorted chromosomes of Myotis myotis. Each Myotis myotis autosomal probe detected a single homologous chromosomal segment in the genomes of these six vesper bats except for MMY chromosome 3/4 paint which hybridized onto two chromosomes in the genome of M. fuliginosus. Our results show that Robertsonian translocation is the main mode of karyotype evolution in Vespertilionidae and that the addition of heterochromatic material also plays an important role in the karyotypic evolution of the genera Tylonycteris and Nyctalus. Two conserved syntenic associations (MMY9 + 23 and 18 + 19) could be the synapomorphic features for the genus Tylonycteris. The integration of our maps with the published maps has enabled us to deduce chromosomal homologies between human and these six vesper bats and provided new insight into the karyotype evolution of the family Vespertilionidae.
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184
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Wang Y, Wang L, Lv J, Zhao L, Xiao Z, Zhang H, Feng Q, Zhang Z, Yin W. 2503. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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185
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Zhu X, Wang L, Ou G, Wang Y, Zhang H, Chen D, Feng Q, Dai J, Zhang Z, Yin W. 2461. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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186
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Ziqiang W, Feng Q, Zhimin C, Miao W, Lian Q, Huaxing L, Peiwu Y. Comparison of laparoscopically assisted and open radical distal gastrectomy with extended lymphadenectomy for gastric cancer management. Surg Endosc 2006; 20:1738-43. [PMID: 17024529 DOI: 10.1007/s00464-006-0031-6] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2006] [Accepted: 06/07/2006] [Indexed: 12/18/2022]
Abstract
BACKGROUND The feasibility and safety of laparoscopically assisted gastrectomy with extended lymphadenectomy for advanced gastric cancer has rarely been studied. This study aimed to investigate the feasibility, safety, and cancer clearance of laparoscopically assisted distal gastrectomy with D2 lymphadenectomy. METHODS Of the 44 patients with distal gastric cancer who underwent radical distal gastrectomy from March 2004 to May 2005, 35 were treated with D2/D2(+) lymphadenectomy. These patients were compared with 58 patients who, during the same period, underwent a conventional open radical distal gastrectomy. RESULTS The mean total number of retrieved lymph nodes (30.11 +/- 16.97) and the mean tumor margin were comparable with those in the open group. The mean operative time for laparoscopically assisted distal gastrectomy was significantly longer than for open surgery (282.84 +/- 32.81 min vs 223.75 +/- 23.25 min). The patients in the laparoscopic surgery group had less blood loss, shorter times of analgesic injection, and a faster recovery. The rates of complications were comparable between two groups. CONCLUSIONS Although laparoscopically assisted radical gastrectomy with D2 lymphadenectomy is more time consuming than open surgery, it is a safe, feasible procedure that achieves cancer clearance similar to open surgery and leads to a quick postoperative recovery.
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187
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Ni S, Gaggar A, Di Paolo N, Li ZY, Liu Y, Strauss R, Sova P, Morihara J, Feng Q, Kiviat N, Touré P, Sow PS, Lieber A. Evaluation of adenovirus vectors containing serotype 35 fibers for tumor targeting. Cancer Gene Ther 2006; 13:1072-81. [PMID: 16874361 DOI: 10.1038/sj.cgt.7700981] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
There is growing evidence from in vitro studies that subgroup B adenoviruses (Ad) can overcome the limitations in safety and tumor transduction efficiency seen with commonly used subgroup C serotype 5-based vectors. In this study, we confirm that the expression level of the B-group Ad receptor, CD46, correlates with the grade of malignancy of cervical cancer in situ. We also demonstrate the in vivo properties of Ad5-based vectors that contain the B-group Ad serotype 35 fiber (Ad5/35) in transgenic mice that express CD46 in a pattern and at a level similar to humans. Upon intravenous and intraperitoneal injection, an Ad5/35 vector did not efficiently transduce normal tissue, but was able to target metastatic or intraperitoneal tumors that express CD46 at levels comparable to human tumors. When an oncolytic Ad5/35-based vector was employed, in both tumor models antitumor effects were observed. Furthermore, injection of Ad5/35 vectors into CD46 transgenic mice caused less innate toxicity than Ad5 vectors. Our data demonstrate that Ad vectors that target CD46 offer advantages over Ad5-based vectors for treatment of cancer.
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188
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Wen PH, Feng Q. Crystal structure of(N1E,N2E)-N1,N2-bis(5 -hydroxymethyl-2-methyl-3-oxopyridinio-4-ylmethylene)ethane-1,2-diamine-nickel(II)dihydro-chloride,[Ni(C18H22N4O4)]Cl2. Z KRIST-NEW CRYST ST 2006. [DOI: 10.1524/ncrs.2006.221.14.501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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189
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Quan GX, Krell PJ, Arif BM, Feng Q. Receptor of activated C kinase 1 (RACK1) is necessary for the 20-hydroxyecdysone-induced expression of the transcription factor CHR3 in the spruce budworm Choristoneura fumiferana. INSECT MOLECULAR BIOLOGY 2006; 15:79-87. [PMID: 16469071 DOI: 10.1111/j.1365-2583.2006.00611.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
To initiate moulting and metamorphosis, 20-hydroxyecdysone (20E) binds to its nuclear receptors and the ligand-receptor complex then mediates changes in gene expression. Phosphorylation of the receptors is required for their function. The intracellular signal transduction pathway that is involved in receptor phosphorylation remains elusive. This study provides evidence that the receptor of activated C kinase 1 (RACK1) and protein kinase C (PKC) signal transduction cascade is involved in the 20E-induced expression of the moult-associated transcription factor CHR3. A cDNA clone encoding a receptor of activated C kinase 1 was isolated from Choristoneura fumiferana (CfRACK1). This single copy gene coded a 36 kDa protein and was expressed ubiquitously in all of the developmental stages and the tissues tested, including the midgut, epidermis, fat body, head, Malpighian tubules, ovary and testis of larvae. High levels of the transcripts were also detected in a midgut-derived CF-203 cell line. We noticed that the green fluorescence protein-fused CfRACK1 protein was distributed in the cytosol surrounding the nuclei in stably transformed cells. Interference of CfRACK1 mRNA suppressed the 20E-induced expression of the transcription factor CHR3. Dequalinium-14; 1,1'-decamethylenebis-4-aminoquinaldinium diiodide (DECA), an inhibitor of RACK1 binding to protein kinase C, blocked the 20E-induced expression of CHR3 and accumulation of the ecdysone receptor (EcR) in the nuclei. All of these data together suggest that 20E-induced expression of CHR3 may involve phosphorylation of the ecdysone receptor component through the PKC/RACK1 signal transduction cascade, which facilitates the import of the receptor into the nuclei of cells.
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190
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Dmitrovsky E, Dragnev K, Feng Q, Ma Y, Shah S, Black C, Memoli V, Nugent W, Rigas J, Sutisak K, Freemantle S. Uncovering novel targets for cancer chemoprevention. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)80508-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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191
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Wanner KW, Isman MB, Feng Q, Plettner E, Theilmann DA. Developmental expression patterns of four chemosensory protein genes from the Eastern spruce budworm, Chroistoneura fumiferana. INSECT MOLECULAR BIOLOGY 2005; 14:289-300. [PMID: 15926898 DOI: 10.1111/j.1365-2583.2005.00559.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Chemosensory proteins (CSPs) are associated with insect sensory organs, including the sensillum lymph in some cases. However, they are also commonly expressed in nonsensory tissues that lack gustatory and olfactory neurones. We characterized the sex and development specific expression patterns of four CSP genes from the Eastern spruce budworm (ESB) using Northern blots. CfumAY426540.2 was detected at high levels in adult moths. Conversely, CfumAY426538 was expressed in all stages except adult moths, and was most abundant during late stages of the 6th instar. CfumAY701858 was expressed in all stages, while CfumAY426539 was detected less frequently, at specific developmental stages such as the 5th to 6th instar moult. During a natural moult, and a premature moult induced by the ecdysteroid agonist tebufenozide, CfumAY701858 and CfumAY426539 were up-regulated, while CfumAY426538 appeared to be down-regulated. Our results suggest that some members of the CSP gene family from the ESB may be involved in development, including moulting.
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192
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Schmitz A, Shiue CY, Feng Q, Shiue G, Deng S, Pourdehnad M, Schirrmacher R, Vatamaniuk M, Doliba N, Matschinsky F, Wolf B, Rösch F, Naji A, Alavi A. Erratum to “Synthesis and evaluation of fluorine-18 labeled glyburide analogs as β-cell imaging agents” [Nucl. Med. Biol. 2004;31: 483–491]. Nucl Med Biol 2005. [DOI: 10.1016/j.nucmedbio.2004.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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193
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Wu G, Zhang T, Nguyen N, Schroder C, Pfeiffer S, Laaris A, Zhou H, Feng Q, Azimzadeh A, Pierson R. CD154 and CD28/B7 costimulation pathways regulate both natural and induced anti-pig antibodies in baboons. J Heart Lung Transplant 2005. [DOI: 10.1016/j.healun.2004.11.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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194
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Schmitz A, Shiue CY, Feng Q, Shiue GG, Deng S, Pourdehnad MT, Schirrmacher R, Vatamaniuk M, Doliba N, Matschinsky F, Wolf B, Rösch F, Naji A, Alavi AA. Synthesis and evaluation of fluorine-18 labeled glyburide analogs as beta-cell imaging agents. Nucl Med Biol 2004; 31:483-91. [PMID: 15093819 DOI: 10.1016/j.nucmedbio.2003.12.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2003] [Revised: 11/28/2003] [Accepted: 12/03/2003] [Indexed: 01/20/2023]
Abstract
Glyburide is a prescribed hypoglycemic drug for the treatment of type 2 diabetic patients. We have synthesized two of its analogs, namely N-[4-[beta-(2-(2'-fluoroethoxy)-5-chlorobenzenecarboxamido)ethyl]benzenesulfonyl]-N'-cyclohexylurea (2-fluoroethoxyglyburide, 8b) and N-[4-[beta-(2-(2'-fluoroethoxy)-5-iodobenzenecarboxamido)ethyl]benzenesulfonyl]-N'-cyclohexylurea (2-fluoroethoxy-5-deschloro-5-iodoglyburide, 8a), and their fluorine-18 labeled analogs as beta-cell imaging agents. Both F-18 labeled compound 8a and compound 8b were synthesized by alkylation of the corresponding multistep synthesized hydroxy precursor 4a and 4b with 2-[(18)F]fluoroethyl tosylate in DMSO at 120 degrees C for 20 minutes followed by HPLC purification in an overall radiochemical yield of 5-10% with a synthesis time of 100 minutes from EOB. The octanol/water partition coefficients of compounds 8a and 8b were 141.21 +/- 27.77 (n = 8) and 124.33 +/- 21.61 (n = 8), respectively. Insulin secretion experiments of compounds 8a and 8b on rat islets showed that both compounds have a similar stimulating effect on insulin secretion as that of glyburide. In vitro binding studies showed that approximately 2% of compounds 8a and 8b bound to beta TC3 and Min6 cells and that the binding was saturable. Preliminary biodistribution studies in mice showed that the uptake of both compounds 8a and 8b in liver and small intestine were high, whereas the uptake in other organs studied including pancreas were low. Additionally, the uptake of compound 8b in vivo was nonsaturable. These results tend to suggest that compounds 8a and 8b may not be the ideal beta-cell imaging agents.
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Feng Q, Liu W, Su Y, Zhang Y, Si J. Distribution and evolution of water chemistry in Heihe River basin. ACTA ACUST UNITED AC 2004. [DOI: 10.1007/s00254-003-0950-7] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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196
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Cheng XW, Henriques TR, Coppens SR, Feng Q, Retnakaran A, Krell PJ, Arif BM. Strategy to screen long DNA inserts in Escherichia coli. Biotechniques 2003; 34:1162-4, 1166. [PMID: 12813882 DOI: 10.2144/03346bm08] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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197
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Feng Q, Zhang Y. The NuRD complex: linking histone modification to nucleosome remodeling. Curr Top Microbiol Immunol 2003; 274:269-90. [PMID: 12596911 DOI: 10.1007/978-3-642-55747-7_10] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
ATP-dependent nucleosome remodeling and core histone tail modifications play important roles in chromatin function. Purification and characterization of the NuRD/Mi-2 complex, which possesses both nucleosome remodeling and histone deacetylase activities, suggests that ATP-dependent nucleosome remodeling and histone tail modification can be coupled. Recent studies indicate that NuRD is an integral part of the MeCP1 complex, suggesting that nucleosome remodeling and histone deacetylation play important roles in methylated DNA silencing. Studies in Caenorhabditis elegans have revealed important functions of the NuRD complex in embryonic patterning and Ras signaling. Accumulating evidence indicates that NuRD may regulate transcription of specific genes by interacting with specific transcriptional factors. In addition, it may also participate in genome-wide transcriptional regulation through an association with histone tails.
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198
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Zheng Y, Zheng S, Cheng X, Ladd T, Lingohr EJ, Krell PJ, Arif BM, Retnakaran A, Feng Q. A molt-associated chitinase cDNA from the spruce budworm, Choristoneura fumiferana. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2002; 32:1813-1823. [PMID: 12429133 DOI: 10.1016/s0965-1748(02)00166-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Chitinase (CfChitinase) cDNA from the spruce budworm, Choristoneura fumiferana, was cloned using reverse transcription PCR and cDNA library screening. The CfChitinase cDNA was determined to be 2856 nucleotides long with the longest open reading frame made up of 1671 nucleotides that encoded a protein that was 557 amino acid long with a predicted molecular mass of 62 kDa. The deduced amino acid sequence showed 76-79% identity with other lepidopteran chitinases. Northern blots revealed that transcripts of CfChitinase appeared prior to each molt and peaked on the day of ecdysis from the second instar to the pupal stage but disappeared immediately after the molt. No transcripts could be detected in the early first instar prior to the spinning of the hibernaculum or in the diapausing second instars or during the intermolt periods of the other instars. Western blot analysis revealed that the protein appeared 12 h prior to ecdysis and disappeared 12 h after ecdysis from the sixth instar to pupal stage. The 20-hydroxyecdysone analog, tebufenozide (RH5992), induced expression of CfChitinase in the early stage of the sixth instar and caused a precocious and incomplete molt into an extra larval stage. During the sixth instar to the pupal molt, transcripts could be detected only in the epidermis and fat bodies, but not in the midgut. Western blots showed that the protein was present in the epidermis and midgut, but not in the fat bodies. The recombinant protein expressed in Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV) showed high levels of chitinolytic activity with an optimal pH range 6-9. Glycosylation appeared to be necessary for the chitinolytic activity and secretion of the recombinant protein.
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199
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Feng Q, Kumagai T, Nakamura Y, Uchida K, Osawa T. Induction of cytochrome P4501A1 by autoclavable culture medium change in HepG2 cells. Xenobiotica 2002; 32:1033-43. [PMID: 12487732 DOI: 10.1080/0049825021000012583] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
1. Without the addition of xenobiotics, only by changing the culture medium can one induce extensively and transiently cytochrome P4501A1 (CYP1A1) protein and mRNA in human hepatoma HepG2 cells. The induction was aryl hydrocarbon receptor (AhR)-dependent, and was proven by: (1) the medium change activated the AhR, as judged by a electrophoretic mobility shift assay; and (2) the AhR inhibitor alpha-naphthoflavone inhibited the medium change-mediated induction. 2. Induction of CYP1A1 was related to medium prepared by autoclaving. By screening the ingredients in the medium, the serum had no effect on CYP1A1 induction, whereas both photo-oxidized and autoclaved tryptophan were shown to induce CYP1A1, as indicated by CYP1A1 protein or ethoxyresorufin-O-deethylase activity. The autoclaved tryptophan contained in an autoclavable medium was a more potent inducer of CYP1A1 than photo-oxidized tryptophan. 3. The results provide some practical suggestions with experiments related to CYP1A1.
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200
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Feng Q, Arif BM, Palli SR, Sohi SS, Retnakaran A. Molecular modifications of baculoviruses for the control of forest insect pests. Adv Virus Res 2002; 57:263-90. [PMID: 11680386 DOI: 10.1016/s0065-3527(01)57005-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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