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Chen GF, Shi TP, Wang BJ, Wang XY, Zang Q. EFFICACY OF DIFFERENT RESECTIONS ON NON-MUSCLE-INVASIVE BLADDER CANCER AND ANALYSIS OF THE OPTIMAL SURGICAL METHOD. J BIOL REG HOMEOS AG 2015; 29:465-470. [PMID: 26122238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This study aimed to analyze the clinical efficacy of different resections in treating non-muscle-invasive bladder cancer (NMIBC), including partial cystectomy, transurethral resection of bladder tumor (TURBT) and holmium laser resection of bladder tumor. Two hundred and sixteen patients were recruited with NMIBC who were available for follow-up visits in hospital, including 62 cases treated with partial cystectomy, 90 cases treated with TURBT and 64 cases with holmium laser resection. Analysis was made on the cases with tumor relapse in the two years, on operation time, blood loss, time for indwelling urinary catheter, hospital stay and complications after operation. Results were compared to the clinical efficacy of these operation patterns. It was found that the two-year relapse rate for TURBT group, partial cystectomy group and Holmium laser resection group was 41%, 31%, and 33% respectively, and the difference had no statistical significance (p>0.05). Both the TURBT group and holmium laser resection group had shorter operation time, hospital stay and time for indwelling urinary catheter as well as much less blood loss when compared with the partial cystectomy group; the difference had statistical significance (p<0.001). In terms of complications, the TURBT group was likely to induce obturator nerve reflex and bladder perforation while the partial cystectomy group was likely to induce bladder spasm. Therefore, this study presumes that holmium laser resection and TURBT are much safer and quicker for recovery and obviously superior to the partial cystectomy.
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Chen BH, Li JT, Chen GF. Efficient synthesis of 2,3-disubstituted-2,3-dihydroquinazolin-4(1H)-ones catalyzed by dodecylbenzenesulfonic acid in aqueous media under ultrasound irradiation. ULTRASONICS SONOCHEMISTRY 2015; 23:59-65. [PMID: 25224856 DOI: 10.1016/j.ultsonch.2014.08.024] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Revised: 08/17/2014] [Accepted: 08/27/2014] [Indexed: 06/03/2023]
Abstract
Synthesis of 2,3-disubstituted-2,3-dihydroquinazolin-4(1H)-one derivatives catalyzed by dodecylbenzenesulfonic acid was carried out in 80-92% yields at 40-42 °C within 1-2 h in aqueous media via one-pot three-component condensation of isatoic anhydride, aromatic aldehyde and amine under ultrasound irradiation. Convenient work-up procedures, mild reaction conditions, avoiding the use of organic solvents, and friendly to environment are the salient features of this protocol.
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Chen CF, Feng X, Liao HY, Jin WJ, Zhang J, Wang Y, Gong LL, Liu JJ, Yuan XH, Zhao BB, Zhang D, Chen GF, Wan Y, Guo J, Yan HP, He YW. Regulation of T cell proliferation by JMJD6 and PDGF-BB during chronic hepatitis B infection. Sci Rep 2014; 4:6359. [PMID: 25219359 PMCID: PMC4163673 DOI: 10.1038/srep06359] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 07/24/2014] [Indexed: 01/31/2023] Open
Abstract
T cell functional exhaustion during chronic hepatitis B virus (HBV) infection may contribute to the failed viral clearance; however, the underlying molecular mechanisms remain largely unknown. Here we demonstrate that jumonji domain-containing protein 6 (JMJD6) is a potential regulator of T cell proliferation during chronic HBV infection. The expression of JMJD6 was reduced in T lymphocytes in chronic hepatitis B (CHB) patients, and this reduction in JMJD6 expression was associated with impaired T cell proliferation. Moreover, silencing JMJD6 expression in primary human T cells impaired T cell proliferation. We found that JMJD6 promotes T cell proliferation by suppressing the mRNA expression of CDKN3. Furthermore, we have identified platelet derived growth factor-BB (PDGF-BB) as a regulator of JMJD6 expression. PDGF-BB downregulates JMJD6 expression and inhibits the proliferation of human primary T cells. Importantly, the expression levels of JMJD6 and PDGF-BB in lymphocytes from CHB patients were correlated with the degree of liver damage and the outcome of chronic HBV infection treatment. Our results demonstrate that PDGF-BB and JMJD6 regulate T cell function during chronic HBV infection and may provide insights for the treatment strategies for CHB patients.
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Chen BH, Li JT, Lan RJ, Chen GF. Ultrasound-promoted One-pot Synthesis of 2-Thioxo-dihydropyrimidine Derivatives Bearing Piperidinylamide Moiety. LETT ORG CHEM 2014. [DOI: 10.2174/1570178611666140707183047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Xu JB, Qi FZ, Xu G, Chen GF, Qin LX, Zhang JH. Value of alpha-fetoprotein and clinical characteristics in patients with liver neoplasm. Neoplasma 2014; 61:218-24. [PMID: 24299318 DOI: 10.4149/neo_2014_028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This article aimed to investigate the value of α-fetoprotein (AFP) for the diagnosis of hepatocellular carcinoma (HCC) and to evaluate the relationship between AFP and various clinical variables of HCC comprehensively. A retrospective study of postoperative patients diagnosed with liver neoplasm from two Chinese centers was enrolled in our study.A total of 3050 patients were included. The best cut-off point of AFP for the diagnosis of HCC was 20ng/ml with ideal sensitivity (69.74%), specificity (91.18%), LR (4.12) and YI (0.61). Non-HBV infection patients showed the highest specificity (94.44%) but lowest sensitivity (60.13%). In HBV infection. Patients, HBsAg, HBeAb, and HBcAb positive patients had the highest sensitivity (79.55%) and specificity (58.49%). AFP levels increased significantly in symptomatic patients (p=0.011). Those patients with tumor sizes ≥10cm had much higher serum AFP level compared with smaller tumors ones (p=0.014). AFP levels increased remarkably in patients with vascular invasion (p=0.015). Stepwise logistic regression showed tumor size (≥10cm) was an independent predictor of elevated AFP (OR=2.743, 95%CI: 1.167-6.447, P=0.021). The best discriminating AFP value for the diagnosis of HCC is 20ng/ml; HBsAg, HBeAb and HBcAb positive patients have the optimal sensitivity and specificity; tumor size ≥ 10cm is an independent predictor of elevated AFP.
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Bai GY, Lan XW, Chen GF, Liu XF, Li TY, Shi LJ. A novel sodium iodide and ammonium molybdate co-catalytic system for the efficient synthesis of 2-benzimidazoles using hydrogen peroxide under ultrasound irradiation. ULTRASONICS SONOCHEMISTRY 2014; 21:520-526. [PMID: 24074960 DOI: 10.1016/j.ultsonch.2013.08.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 08/28/2013] [Accepted: 08/28/2013] [Indexed: 06/02/2023]
Abstract
The reaction of aldehydes and o-phenylenediamine for the preparation of 2-benzimidazoles has been studied using hydrogen peroxide as an oxidant under ultrasound irradiation at room temperature in this paper. The combination of substoichiometric sodium iodide and ammonium molybdate as co-catalysts, together with using small amounts of hydrogen peroxide, makes this transformation very efficient and attractive under ultrasound. Thus, a mild, green and efficient method is established to carry out this reaction in high yield.
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Chen GF, Shen HD, Zhang LY, Li HY, Lan RJ, Chen BH, Li JT, Hu QH. One-pot Synthesis of 2-Substituted Benzoxazoles Promoted by Copper Acetate Monohydrate. LETT ORG CHEM 2014. [DOI: 10.2174/15701786113106660070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Xu JB, Qi FZ, Xu G, Chen GF, Huang MD, Zhang JH. Adjuvant interferon therapy after surgical treatment for hepatitis B/C virus-related hepatocellular carcinoma: A meta-analysis. Hepatol Res 2014; 44:209-17. [PMID: 23578168 DOI: 10.1111/hepr.12109] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 02/28/2013] [Accepted: 03/04/2013] [Indexed: 12/15/2022]
Abstract
AIM This meta-analysis aimed to determine whether interferon (IFN) therapy could improve clinical effects of patients with chronic hepatitis B virus (HBV)or hepatitis C virus (HCV) infection-related primary hepatocellular carcinoma (HCC) after surgery. METHODS An electronic search from January 1998 to December 2012 was conducted to identify comparative studies evaluating IFN therapy on recurrence and survival after surgical treatment of HCC. RESULTS The estimated odds ratios (OR) for the 1-, 2-, 3- and 5-year overall survival rates of HBV-related HCC were 3.37 (95% confidence interval [CI], 1.18-6.27), 2.36 (95% CI, 1.45-3.83), 1.81 (95% CI, 1.21-2.72) and 1.93 (95% CI, 1.35-2.75), respectively; and the OR for the 1-, 2-, 3- and 5-year recurrence rates were 0.63 (95% CI, 0.44-0.91), 0.84 (95% CI, 0.60-1.18), 0.88 (95% CI, 0.63-1.22) and 0.78 (95% CI, 0.56-1.07), respectively. The overall survival rates of HCV-related HCC were significantly higher in IFN groups than in control groups at 1, 2, 3 and 5 years (OR, 2.10; 95% CI, 0.96-4.55; OR, 1.71; 95% CI, 1.01-2.89; OR, 1.76; 95% CI, 1.09-2.83; and OR, 3.03; 95% CI, 1.97-4.65, respectively); and the recurrence rates of IFN groups were lower than control groups at 1, 2, 3 and 5 years (OR, 0.60; 95% CI, 0.38-0.92; OR, 0.57; 95% CI, 0.41-0.81; OR, 0.58; 95% CI, 0.41-0.80; and OR, 0.52; 95% CI, 0.36-0.75, respectively). CONCLUSION In conclusion, IFN therapy in this meta-analysis shows a significant clinical effect in postoperative patients of HCC, particularly in HCV-related HCC.
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Chen GF, Li HY, Xiao N, Chen BH, Song YL, Li JT, Li ZW. Efficient Synthesis of 2-Imidazolines in the Presence of Molecular Iodine Under Ultrasound Irradiation. Aust J Chem 2014. [DOI: 10.1071/ch13700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
An efficient one-pot synthesis process for preparing 2-imidazolines from aldehydes and ethylenediamine using molecular iodine and potassium carbonate in absolute ethanol at 25–30°C under ultrasound irradiation is described. The synthetic strategy has the following advantages: mild conditions and low costs requirements, readily available catalyst, short reaction times, simplicity of operation, and good-to-excellent yields.
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Chen GF, Jia HM, Zhang LY, Chen BH, Li JT. An efficient synthesis of 2-substituted benzothiazoles in the presence of FeCl3/Montmorillonite K-10 under ultrasound irradiation. ULTRASONICS SONOCHEMISTRY 2013; 20:627-632. [PMID: 23122553 DOI: 10.1016/j.ultsonch.2012.09.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 08/31/2012] [Accepted: 09/08/2012] [Indexed: 06/01/2023]
Abstract
2-Substituted benzothiazoles have been synthesized via one-pot reaction from aromatic aldehydes and o-aminothiophenol in the presence of FeCl(3)/Montmorillonite K-10 in absolute methanol at 25-30°C under ultrasound irradiation. The remarkable advantages are an inexpensive and easily available reagent, a simple procedure, mild conditions, short reaction times and moderate to good yields.
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Chen GF, Shen HD, Jia HM, Zhang LY, Kang HY, Qi QQ, Chen BH, Cao JL, Li JT. Eco-Friendly Synthesis of 2-Substituted Benzimidazoles Using Air as the Oxidant. Aust J Chem 2013. [DOI: 10.1071/ch12458] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A simple, environmentally friendly procedure for the synthesis of 2-substituted benzimidazoles by the one-pot condensation of o-phenylenediamines with aromatic aldehydes using continuous bubbling of air in absolute ethanol at room temperature is described. The simplicity of the system, mild conditions, involvement of a non-toxic and practically inexhaustible oxidant, easy and quick isolation of the products, and moderate to good yields are the main advantages of this procedure.
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Li F, Yan T, Zhang J, Shao Q, Li B, Li ZB, Chen GF. [FibroScan can be used to diagnose the size of oesophageal varices in patients with HBV-related cirrhosis]. ZHONGHUA SHI YAN HE LIN CHUANG BING DU XUE ZA ZHI = ZHONGHUA SHIYAN HE LINCHUANG BINGDUXUE ZAZHI = CHINESE JOURNAL OF EXPERIMENTAL AND CLINICAL VIROLOGY 2012; 26:470-473. [PMID: 23627033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
OBJECTIVE To study ability of FibroScan (FS) in diagnosing the size of oesophageal varices (OV) in patients with HBV-related cirrhosis. METHODS A total of 158 patients with HBV-related liver cirrhosis were enrolled in the study. The relation between the presence of OV assessed by endoscopy, and liver stiffness measurement by Fibroscan was studied, and ROC curves were drawn to assess the diagnostic ability of FS value. RESULTS For the patients without OV, mild OV, moderate OV, and severe OV, their corresponding FS values were (21.7 +/- 9.9) kPa, (32.1 +/- 13.6) kPa, (42.3 +/- 20.0) kPa and (54.5 +/- 16.2) kPa, respectively. Significant difference was found among the groups (P < 0.001) and also between any two groups (P < 0.05). ROC curve for the diagnosis of with vs. without OV, <moderate vs. > moderate OV, and < severe vs. severe OV were 0.798 (95% CI: 73.1%-86.5%), 0.823 (95% CI: 74.5%-90.0%) and 0.879 (95% CI: 80.8%-95.0%), respectively, with corresponding FS cut-off value of 23.3 kPa, 31.5 kPa and 34.6 kPa. CONCLUSION Liver stiffness measurement allows to predict the sizes of oesophageal varices in patients with HBV-related cirrhosis.
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Zhu GY, Chen GF, Li JT, Shi ZL, Lin Y, Ding T, Xu XY, Dai J, Xu CX. Fabrication and characterization of n-ZnO nanonails array/p(+)-GaN heterojunction diode. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2012; 12:7950-7953. [PMID: 23421162 DOI: 10.1166/jnn.2012.6658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A novel heterojunctional structure of n-ZnO nanonails array/p(+)-GaN light-emitting diode was fabricated by Chemical Vapor Deposition method. A broad electroluminescence spectrum shows two peaks centered at 435 nm and 478 nm at room temperature, respectively. By comparing the photoluminescence and electroluminescence spectra, together with analyzing the energy band structure of heterojunction light emitting diode, it suggested that the electroluminescence peak located at 435 nm originates from Mg acceptor level of p(+)-GaN layer, whereas the electroluminescence peak located at 478 nm originates from the defects of n-ZnO nanonails array.
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Leu YL, Hwang TL, Kuo PC, Liou KP, Huang BS, Chen GF. Constituents from Vigna vexillata and their anti-inflammatory activity. Int J Mol Sci 2012; 13:9754-9768. [PMID: 22949828 PMCID: PMC3431826 DOI: 10.3390/ijms13089754] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 07/29/2012] [Accepted: 07/31/2012] [Indexed: 11/16/2022] Open
Abstract
The seeds of Vigna genus are important food resources and there have already been many reports regarding their bioactivities. In our preliminary bioassay, the chloroform layer of methanol extracts of V. vexillata demonstrated significant anti-inflammatory bioactivity. Therefore, the present research is aimed to purify and identify the anti-inflammatory principles of V. vexillata. One new sterol (1) and two new isoflavones (2,3) were reported from the natural sources for the first time and their chemical structures were determined by the spectroscopic and mass spectrometric analyses. In addition, 37 known compounds were identified by comparison of their physical and spectroscopic data with those reported in the literature. Among the isolates, daidzein (23), abscisic acid (25), and quercetin (40) displayed the most significant inhibition of superoxide anion generation and elastase release.
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Wang NL, Hu WZ, Chen ZG, Yuan RH, Li G, Chen GF, Xiang T. High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:294202. [PMID: 22773312 DOI: 10.1088/0953-8984/24/29/294202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report optical spectroscopic measurements on electron- and hole-doped BaFe2As2. We show that the compounds in the normal state are not simple metals. The optical conductivity spectra contain, in addition to the free carrier response at low frequency, a temperature-dependent gap-like suppression at fairly high energy scale near 0.6 eV. This suppression evolves with the As–Fe–As bond angle induced by electron or hole doping. Furthermore, the feature becomes much weaker in the Fe-chalcogenide compounds. We elaborate that the feature is mainly caused by the strong Hund's rule coupling effect between the itinerant electrons and localized electron moment arising from the multiple Fe 3d orbitals. The coupling strength changes with the environment of the Fe atom. Our experiments demonstrate the coexistence of itinerant and localized electrons in iron-based compounds, which would then lead to a more comprehensive picture of the metallic magnetism in the materials.
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Huang MD, Chen XF, Xu G, Wu QQ, Zhang JH, Chen GF, Cai Y, Qi FZ. Genetic variation in the NBS1 gene is associated with hepatic cancer risk in a Chinese population. DNA Cell Biol 2012; 31:678-82. [PMID: 22070649 PMCID: PMC3358090 DOI: 10.1089/dna.2011.1421] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 09/10/2011] [Accepted: 09/12/2011] [Indexed: 01/27/2023] Open
Abstract
NBS1 plays important roles in maintaining genomic stability as a key DNA repair protein in the homologous recombination repair pathway and as a signal modifier in the intra-S phase checkpoint. We hypothesized that polymorphisms of NBS1 are associated with hepatic cancer (HCC) risk. The NBS1 rs1805794 C/G polymorphism has been frequently studied in some cancers with discordant results, but its association with HCC has not been investigated. Moreover, studies of the 3'UTR variant rs2735383 have not touched upon HCC. This study examined the contribution of these two polymorphisms to the risk of developing HCC in a Chinese population. NBS1 genotypes were determined in 865 HCC patients and 900 controls and the associations with risk of HCC were estimated by logistic regression. Compared with the rs1805794 GG genotype, the GC genotype had a significantly increased risk of HCC (adjusted odds ratios [OR]=1.41; 95% confidence interval [CI]=1.11-1.80), the CC carriers had a further increased risk of HCC (OR=2.27; 95% CI=1.68-3.14), and there was a trend for an allele dose effect on risk of HCC (p<0.001). Also, we found that the risk effect of rs1805794 CC+CG was more pronounced in HCC patients that drank (OR=2.28, 95% CI=1.55-3.29 for drinkers; OR=1.31, 95% CI=1.00-1.77 for nondrinkers). However, there was no significant difference in genotype frequencies of rs2735383 G/C site between cases and controls. These findings suggest that rs1805794 C/G polymorphism in NBS1 may be a genetic modifier for developing HCC.
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Xue M, Cao T, Wang D, Wu Y, Yang H, Dong X, He J, Li F, Chen GF. Superconductivity above 30 K in alkali-metal-doped hydrocarbon. Sci Rep 2012; 2:389. [PMID: 22548129 PMCID: PMC3339435 DOI: 10.1038/srep00389] [Citation(s) in RCA: 137] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Accepted: 03/26/2012] [Indexed: 11/09/2022] Open
Abstract
The recent discovery of superconductivity with a transition temperature (T(c)) at 18 K in K(x)picene has extended the possibility of high-T(c) superconductors in organic materials. Previous experience based on similar hydrocarbons, like alkali-metal doped phenanthrene, suggested that even higher transition temperatures might be achieved in alkali-metals or alkali-earth-metals doped such polycyclic-aromatic-hydrocarbons (PAHs), a large family of molecules composed of fused benzene rings. Here we report the discovery of high-T(c) superconductivity at 33 K in K-doped 1,2:8,9-dibenzopentacene (C(30)H(18)). To our best knowledge, it is higher than any T(c) reported previously for an organic superconductor under ambient pressure. This finding provides an indication that superconductivity at much higher temperature may be possible in such PAHs system and is worthy of further exploration.
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Jin WJ, Chen CF, Liao HY, Gong LL, Yuan XH, Zhao BB, Zhang D, Feng X, Liu JJ, Wang Y, Chen GF, Yan HP, He YW. Downregulation of the AU-rich RNA-binding protein ZFP36 in chronic HBV patients: implications for anti-inflammatory therapy. PLoS One 2012; 7:e33356. [PMID: 22428029 PMCID: PMC3302862 DOI: 10.1371/journal.pone.0033356] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 02/13/2012] [Indexed: 12/12/2022] Open
Abstract
Inflammation caused by chronic hepatitis B virus (HBV) infection is associated with the development of cirrhosis and hepatocellular carcinoma; however, the mechanisms by which HBV infection induces inflammation and inflammatory cytokine production remain largely unknown. We analyzed the gene expression patterns of lymphocytes from chronic HBV-infected patients and found that the expression of ZFP36, an AU-rich element (ARE)-binding protein, was dramatically reduced in CD4(+) and CD8(+) T lymphocytes from chronic HBV patients. ZFP36 expression was also reduced in CD14(+) monocytes and in total PBMCs from chronic HBV patients. To investigate the functional consequences of reduced ZFP36 expression, we knocked down ZFP36 in PBMCs from healthy donors using siRNA. siRNA-mediated silencing of ZFP36 resulted in dramatically increased expression of multiple inflammatory cytokines, most of which were also increased in the plasma of chronic HBV patients. Furthermore, we found that IL-8 and RANTES induced ZFP36 downregulation, and this effect was mediated through protein kinase C. Importantly, we found that HBsAg stimulated PBMCs to express IL-8 and RANTES, resulting in decreased ZFP36 expression. Our results suggest that an inflammatory feedback loop involving HBsAg, ZFP36, and inflammatory cytokines may play a critical role in the pathogenesis of chronic HBV and further indicate that ZFP36 may be an important target for anti-inflammatory therapy during chronic HBV infection.
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Ji D, Liu Y, Li L, Xu Z, Si LL, Dai JZ, Li X, Wang L, Yao Z, Xin SJ, Chen GF, Xu D. The rtL229 substitutions in the reverse transcriptase region of hepatitis B virus (HBV) polymerase are potentially associated with lamivudine resistance as a compensatory mutation. J Clin Virol 2012; 54:66-72. [PMID: 22398037 DOI: 10.1016/j.jcv.2012.02.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 01/23/2012] [Accepted: 02/06/2012] [Indexed: 02/07/2023]
Abstract
BACKGROUND It remains unclear whether hepatitis B virus (HBV) reverse-transcriptase (RT) rtL229 substitutions influence HBV drug resistance. OBJECTIVE The study was to investigate the association of HBV rtL229 substitutions with viral resistance to lamivudine (LAM). STUDY DESIGN Entire HBV RT genes were amplified by nested PCR and sequenced from sera of 6000 nucleos(t)ide analog-experienced patients with chronic HBV infection. The incidence and clinic relevance of rtL229 substitutions were analyzed. Replication-competent viral amplicons which harbored HBV genomes of wild-type, rtM204I, or rtM204I in conjunction with various rtL229 substitutions (rtL229F/W/M/V) were constructed. The amplicons were transfected into HepG2 cells for phenotyping of replication capacity and susceptibility to nucleos(t)ide analogs. RESULTS The rtL229 substitutions were detected in 6.57% (394/6000) of patients. Individual substitution incidences were 2.77%, 0.97%, 0.83% and 0.55% for rtL229V, rtL229F, rtL229M and rtL229W, respectively. The incidence of rtL229 substitutions was significantly higher in LAM-experienced patients (341/4220, 8.1%) than in LAM-naïve patients (53/1780, 3.0%), and were independently associated with genotypic LAM resistance (77.9% vs. 21.2%, OR 8.806, 95%CI 6.345-12.223) and low viral replication (HBV DNA <1000IU/mL) (4.60% vs. 24.2%, OR 0.478, 95%CI 0.254-0.898). Representative cases follow-up showed that rtL229F developed subsequent to rtM204I emergence during LAM treatment and regressed with rtM204I after LAM withdrawal. Functionally, rtL229F did not confer reduced susceptibility to LAM, but could restore replication capacity of rtM204I strain. CONCLUSION The rtL229 substitutions were potentially associated with LAM resistance in Chinese patients and rtL229F had characteristics of a compensatory mutation of rtM204I mutant.
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Song YL, Lin ZP, Chen GF, Liu QL, Li JT. Synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one Catalyzed by Silica Sulfuric Acid Under Solvent Free Condition. LETT ORG CHEM 2012. [DOI: 10.2174/157017812800221816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Oka T, Li Z, Kawasaki S, Chen GF, Wang NL, Zheng GQ. Antiferromagnetic spin fluctuations above the dome-shaped and full-gap superconducting states of LaFeAsO1-xFx revealed by (75)As-nuclear quadrupole resonance. PHYSICAL REVIEW LETTERS 2012; 108:047001. [PMID: 22400880 DOI: 10.1103/physrevlett.108.047001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 07/09/2011] [Indexed: 05/31/2023]
Abstract
We report a systematic study by (75)As nuclear-quadrupole resonance in LaFeAsO(1-x)F(x). The antiferromagnetic spin fluctuation found above the magnetic ordering temperature T(N) = 58 K for x = 0.03 persists in the regime 0.04 ≤ x ≤ 0.08, where superconductivity sets in. A dome-shaped x dependence of the superconducting transition temperature T(c) is found, with the highest T(c) = 27 K at x = 0.06, which is realized under significant antiferromagnetic spin fluctuation. With increasing x further, the antiferromagnetic spin fluctuation decreases, and so does T(c). These features resemble closely the cuprates La(2-x)Sr(x)CuO(4). In x = 0.06, the spin-lattice relaxation rate (1/T(1)) below T(c) decreases exponentially down to 0.13T(c), which unambiguously indicates that the energy gaps are fully opened. The temperature variation of 1/T(1) below T(c) is rendered nonexponential for other x by impurity scattering.
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Umezawa K, Li Y, Miao H, Nakayama K, Liu ZH, Richard P, Sato T, He JB, Wang DM, Chen GF, Ding H, Takahashi T, Wang SC. Unconventional anisotropic s-wave superconducting gaps of the LiFeAs iron-pnictide superconductor. PHYSICAL REVIEW LETTERS 2012; 108:037002. [PMID: 22400776 DOI: 10.1103/physrevlett.108.037002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Indexed: 05/31/2023]
Abstract
We have performed high-resolution angle-resolved photoemission spectroscopy on Fe-based superconductor LiFeAs (T(c)=18 K). We reveal multiple nodeless superconducting (SC) gaps with 2Δ/k(B)T(c) ratios varying from 2.8 to 6.4, depending on the Fermi surface (FS). We also succeeded in directly observing a gap anisotropy along the FS with magnitude up to ~30%. The anisotropy is fourfold symmetric with an antiphase between the hole and electron FSs, suggesting complex anisotropic interactions for the SC pairing. The observed momentum dependence of the SC gap offers an excellent opportunity to investigate the underlying pairing mechanism.
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73
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Li JT, Li YW, Song YL, Chen GF. Improved synthesis of 2,2'-arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) derivatives catalyzed by urea under ultrasound. ULTRASONICS SONOCHEMISTRY 2012; 19:1-4. [PMID: 21622016 DOI: 10.1016/j.ultsonch.2011.05.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2011] [Revised: 04/25/2011] [Accepted: 05/04/2011] [Indexed: 05/30/2023]
Abstract
Synthesis of 2,2'-arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) derivatives catalyzed by urea via the condensation of aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione was carried out in 80-98% yields at 50 °C in aqueous media under ultrasound. This method provides several advantages such as environment friendliness, high yields and simple work-up procedure.
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74
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Chen BH, Li JT, Chen GF, Song YL. Efficient Synthesis of β-Acetamido Ketones Catalyzed by Cobalt Sulfate Heptahydrate Under Ultrasound Irradiation. LETT ORG CHEM 2012. [DOI: 10.2174/157017812799304088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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75
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Chen GF, Dong XY, Meng FZ, Chen BH, Li JT, Wang SX, Bai GY. Synthesis of 2-Substituted Benzimidazoles Catalyzed by FeCl3/Al2O3 Under Ultrasonic Irradiation. LETT ORG CHEM 2011. [DOI: 10.2174/157017811796504882] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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