Li Y.,Southern Medical University |
Ma S.,Southern Medical University |
Ma S.,Kunming General Hospital of PLA |
Tang L.,Southern Medical University |
And 10 more authors.
Hepatology | Year: 2013
Given the clinical significance of hepatitis B e antigen (HBeAg) seroconversion in chronic hepatitis B virus (HBV) infection, it is critical to elucidate the mechanisms regulating this process. In the present study, we found that the frequency of circulating chemokine (C-X-C motif) receptor 5 (CXCR5)+CD4+ T cells was higher in patients who had achieved HBeAg seroconversion in both cross-sectional (P<0.001) and longitudinal (P = 0.009) studies. These cells were able to produce a significantly higher level of intracellular interleukin 21 (IL-21) after stimulation with HBV peptides in patients with telbivudine-induced HBeAg seroconversion (P=0.007). Furthermore, sorted CXCR5+CD4+ T cells from HBeAg seroconverters boosted a higher frequency of antibody against hepatitis B e antigen (anti-HBe)-secreting B cells in coculture assay (P=0.011). Of note, the increase in frequency of anti-HBe-secreting B cells was abrogated by soluble recombinant IL-21 receptor-Fc chimera (P=0.027), whereas exogenous recombinant IL-21 enhanced this effect (P=0.043). Additionally, circulating CXCR5+CD4+ T cells shared similar phenotypic markers, and were positively correlated in frequency with, splenic follicular T helper cells. Conclusion: Circulating CXCR5+CD4+ T cells, by producing IL-21, may have a significant role in facilitating HBeAg seroconversion in patients with chronic HBV infection. © 2013 by the American Association for the Study of Liver Diseases.
Wu X.-S.,Kunming General Hospital of PLA |
Deng F.-Y.,Yunnan Nationalities University |
Chen M.,Kunming General Hospital of PLA |
Cai Y.,Academy of Equipment Command and Technology
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2011
Poor resolution and lower modulation thansfer function (MTF) value in infrared imaging system have been remaining for many years because of its large Airy disc of optical lens and the small fill-factor of focal plane array (FPA), respectively. This paper reported a popular way to improve the resolution and MTF of infrared images using micro-scanning technique. The principles were briefly described. The designing rotary IR micro-scanner was discussed. The rotary micro-scanner imaging system using a 240×320 pixels α-siuncooled FPA, and got higher resolution and MTF value of IR videos obviously.
Ma S.-W.,Southern Medical University |
Ma S.-W.,Kunming General Hospital of PLA |
Huang X.,Southern Medical University |
Li Y.-Y.,Southern Medical University |
And 11 more authors.
Journal of Hepatology | Year: 2012
Background & Aims: Interleukin-21 (IL-21) stimulates T cell and B cell responses and plays a role in control of chronic viral infections. The role of IL-21 in chronic hepatitis B virus (HBV) infection is not understood. Methods: Serum IL-21 levels were measured by enzyme immunoassay in 75 HBeAg-positive chronic hepatitis B (CHB) patients undergoing telbivudine treatment. The findings were validated in 103 patients from a separate clinical trial of telbivudine. A complete response to telbivudine was defined as having both HBeAg seroconversion and serum HBV-DNA level <300 copies/ml by treatment week 52. The proportions of T-cells producing IL-21 and/or expressing programmed death 1 (PD-1) in peripheral blood mononuclear cells were assessed longitudinally during treatment by intracellular cytokine staining and flow cytometry. Results: Median serum IL-21 levels at treatment week 12 were significantly higher in patients who did achieve vs. patients who did not achieve a complete response in both the initial (128.4 vs. 69.2 pg/ml, p = 0.003) and the validation (142.2 vs. 89.9 pg/ml, p = 0.004) trials. Serum levels of IL-21 (p = 0.005) or HBV-DNA (p = 0.003) levels at treatment week 12 independently predicted HBeAg seroconversion in the first year of treatment. The decrease in PD-1 expression on CD4 + and CD8 + T cells during the first 12 weeks on telbivudine treatment was not correlated with changes in IL-21 concentrations. Conclusions: Serum IL-21 levels may be a biomarker for HBeAg seroconversion, and may contribute to individualization of antiviral therapy in HBeAg-positive CHB. IL-21 may also have a role in immunotherapy for CHB. © 2011 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.
Deng J.-W.,No535 Hospital Of Pla |
Yang Y.-T.,Heze Municipal Hospital |
Zeng Y.,Kunming General Hospital of PLA |
Tang Z.-M.,No535 Hospital Of Pla |
And 2 more authors.
Journal of Cataract and Refractive Surgery | Year: 2013
Nucleus extraction in manual sutureless extracapsular cataract extraction (ECCE) using the 2-hook technique is described. After capsulorhexis and hydrodissection are performed, the nucleus is moved into the anterior chamber and extracted by pulling with a Sinskey hook and pressuring the scleral bed with a Kuglen hook. In a series of 1320 eyes, 85% achieved a corrected visual acuity of 5/10 or better postoperatively. Complications were posterior capsule rupture, vitreous loss, and transient corneal edema. Manual sutureless ECCE using the 2-hook technique is safe and efficient and does not require expensive instrumentation. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. © 2013 ASCRS and ESCRS.
Li Z.-Q.,Chongqing Medical University |
Ding W.,Chongqing Medical University |
Ding W.,KunMing General Hospital of PLA |
Sun S.-J.,Chongqing Medical University |
And 5 more authors.
PLoS ONE | Year: 2012
Abnormal activation of the canonical Wnt signaling pathway has been implicated in carcinogenesis. Transcription of Wnt target genes is regulated by nuclear β-catenin, whose over-expression is observed in Hepatocellular Carcinoma (HCC) tissue. Cyr61, a member of the CCN complex family of multifunctional proteins, is also found over-expressed in many types of tumor and plays dramatically different roles in tumorigenesis. In this study, we investigated the relationship between Cyr61 and β-catenin in HCC. We found that while Cyr61 protein was not expressed at a detectable level in the liver tissue of healthy individuals, its expression level was elevated in the HCC and HCC adjacent tissues and was markedly increased in cancer-adjacent hepatic cirrhosis tissue. Over-expression of Cyr61 was positively correlated with increased levels of β-catenin in human HCC samples. Activation of β-catenin signaling elevated the mRNA level of Cyr61 in HepG2 cells, while inhibition of β-catenin signaling reduced both mRNA and protein levels of Cyr61. We identified two TCF4-binding elements in the promoter region of human Cyr61 gene and demonstrated that β-catenin/TCF4 complex specifically bound to the Cyr61 promoter in vivo and directly regulated its promoter activity. Furthermore, we found that over-expression of Cyr61 in HepG2 cells promoted the progression of HCC xenografts in SCID mice. These findings indicate that Cyr61 is a direct target of β-catenin signaling in HCC and may play an important role in the progression of HCC. © 2012 Li et al.
Kong F.-Y.,Kunming General Hospital of PLA |
Li Q.,Kunming General Hospital of PLA |
Liu S.-X.,Kunming General Hospital of PLA
High Altitude Medicine and Biology | Year: 2011
Kong, Fan-Yi, Qiang Li, and Shi-Xiang Liu. Poor sleep quality predicts decreased cognitive function independently of chronic mountain sickness (CMS) score in young soldiers with polycythemia stationed in Tibet. High Alt. Med. Biol. 12:237-242, 2011.-Little is known about the association between poor sleep and cognitive function in people with polycythemia at high altitude. The aim of this study was to survey the sleep quality of individuals with polycythemia at high altitude and determine its association with cognitive abilities. We surveyed 230 soldiers stationed in Tibet (all men; mean age 21-52±4.30yr) at altitudes ranging from 3658 to 3996m. All participants were given a blood tests for hemoglobin level and a questionnaire survey of cognitive function. Polycythemia was defined as excessive erythrocytosis (Hb≥21g/dL in men or ≥19g/dL in women). Poor sleepers were defined as having a global Pittsburgh Sleep Quality Index score (PSQI)>5. Cognitive abilities were determined by the Chinese revision of the Wechsler Adult Intelligence Scale and the Benton Visual Retention Test. Multiple linear regression analysis was used to determine the association between the PSQI and cognitive function. Logistic regression analysis was performed to determine the independent effect of sleep quality on cognitive function. The global PSQI score of enrolled participants was 8.14±3.79. Seventy-five (32.6%) soldiers were diagnosed with polycythemia. The proportion of poor sleepers was 1.45 times greater in those with polycythemia compared with those without polycythemia [95% (confidence interval) CI 1.82-2.56], and they had a statistically significant lower score for cognitive function. Multiple linear regression analysis showed that the global PSQI score was negatively associated with IQ (β=0.11, 95% CI -0.16 to -0.05) and digit symbol scores (β=0.66, 95% CI -0.86 to -0.44). Poor sleep quality was determined to be an independent predictor of impaired IQ [odds ratio (OR) 1.59, 95% CI 1.30-1.95] and digit symbol score (OR 1.18, 95% CI 1.07-1.31) in logistic regression analysis. The present study showed that for young soldiers with polycythemia at high altitude impaired subjective sleep quality was an independent predictor of decreased cognitive function, especially IQ and verbal short-term memory. © Copyright 2011, Mary Ann Liebert, Inc. 2011.
Li G.-H.,Chongqing Medical University |
Wei H.,Chongqing Medical University |
Lv S.-Q.,Chongqing Medical University |
Ji H.,Kunming General Hospital of PLA |
And 2 more authors.
International Journal of Oncology | Year: 2010
Glioblastoma is a highly lethal brain tumor of the human primary nervous system tumors. Previous studies demonstrated that glioblastoma stem cells were able to initiate and reform the original cancer. In this study, we found that there were expression and activation of STAT3, a key signal transduction factor and oncoprotein, in human glioblastoma stem cells (GSCs). STAT3 plays a key role in proliferation, apoptosis and differentiation in embryonic stem cells and several cancer types. To investigate the effects of STAT3 on human GSCs, the expression and activation of STAT3 were suppressed by RNAi mediated with lentivirus. We demonstrated that siRNA of STAT3 significantly suppressed STAT3 expression and activation and resulted in inhibition of cell growth in GSCs. Knockdown of STAT3 induces apoptosis and reduces significantly expression of Bcl-2 and cyclin-D in human primary GSCs, whereas no significance was achieved in BAX and caspase-3 expression. Inhibition of STAT3 expression is associated not only with decreasing of CD133+ cell proportion and increasing of GFAP and MBP exression, but also with decrease of the capacity to initiate a tumor in human primary GSCs. Together, these studies suggest that STAT3 is an important target for human GSCs in regulation of GSCs growth, apoptosis, differentiation and tumorigenic potential.
Zhao W.-X.,Kunming General Hospital of PLA |
Wang L.,Kunming General Hospital of PLA |
Yang J.-L.,Kunming General Hospital of PLA |
Li L.-Z.,Yunnan University |
And 2 more authors.
International Journal of Molecular Medicine | Year: 2014
Hepatic stellate cells (HSCs) are the major cell type involved in liver fibrosis. Lipopolysaccharide (LPS)-mediated signaling through koll-like receptor 4 (TLR4) in HSCs has been identified as a key event in liver fibrosis, and as the molecular link between inflammation and liver fibrosis. In this study, we investigated the effects of caffeic acid phenethyl ester (CAPE), one of the main medicinal components of propolis, on the pro-inflammatory and fibrogenic phenotypes of LPS-stimulated HSCs. HSCs from rats were isolated and cultured in Dulbecco's modified Eagle's medium (DMEM). Following treatment with LPS, HSCs showed a strong pro-inflammatory phenotype with an upregulation of pro-inflammatory mediators, and a fibrogenic phenotype with enhanced collagen synthesis, mediated by transforming growth factor-β1 (TGF-β1). CAPE significantly and dose-dependently reduced LPS-induced nitrite production, as well as the transcription and protein synthesis of monocyte chemoattractant protein-1 (MCP-1), interleukin-6 (IL-6) and inducible nitric oxide synthase (iNOS), as determined by quantitative reverse transcription-polymerase chain reaction (qRT-PCR), western blotting and enzyme-linked immunosorbent assays (ELISA). CAPE further reduced the TGF-β1-induced transcription and translation (protein synthesis) of the gene coding for collagen type I a1 (col1A1), in LPS-stimulated HSCs. Following LPS stimulation, the phosphorylation of the nuclear factor-kB (NF-kB) inhibitor IkBa and consequently, the nuclear translocation of NF-kB, were markedly increased in the HSCs, and these changes were reversed by pre-treatment with CAPE. In conclusion, CAPE attenuates the pro-inflammatory phenotype of LPS-stimulated HSCs, as well as the LPS-induced sensitization of HSCs to fibrogenic cytokines by inhibiting NF-kB signaling. Our results provide new insight into the treatment of hepatic fibrosis through regulation of the TLR4 signaling pathway.
Yuan Y.,Kunming General Hospital of PLA
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi | Year: 2012
The present paper is aimed to discuss the influence of three different ways on modification of aluminum borate whiskers (AlBw) and on flexural properties of dental composite resins. In Group A, AlBw and silicon dioxide (SiO2) nanoparticles were thermally fused directly under certain processes. In Group B, Si-O network was formed on the surface of AlBw via the sol-gel process of tetraethoxysilane, then thermally fused with SiO2 nanoparticles to form AlBw-SiO2 compound as inorganic fillers. In Group C, SiO2 nanoparticles were repaired by sol-gel method of tetraethoxysilane under certain processes, and were deposited in the surface of AlBw. The mixtures were fused with high temperature sintering method. The effects of the surface morphology of AlBw with different ways were characterized by TEM and SEM. Then the mixtures were polymerized with resin matrix after surface siliconization and their flexural strength and Young's modulus were determined. SEM was used to examine specimen fracture surfaces. The results showed that the flexural properties of dental composite resins were significantly improved after whiskers were modified. Different methods produce different effects. Flexural strength of the Group A is (95.28 +/- 4.53) MPa. The results of TEM and SEM revealed that the aggregation was obvious between AlBw and SiO2 nanoparticles. Flexural strength of the Group B was (123.14 +/- 17.37) MPa. The results of TEM and SEM revealed that the dispersity was improved but SiO2 nanoparticles also reunited. AlBw were modified with nanometer-size SiO2 particles which were prepared by sol-gel method based on tetraethyl orthosioate (TEOS), the flexural properties of a new type of dental composite resins was (130.29 +/- 8.38) MPa. The results of TEM and SEM revealed that better dispersion between AlBw and SiO2 nanoparticles occurred. The SiO2 nanoparticles were fused and attached onto the surface of AlBw uniformly.
Gui Q.,Hunan University |
Yang Z.,Hunan University |
Chen X.,Hunan University |
Liu J.,Hunan University |
And 3 more authors.
Synlett | Year: 2013
Synthesis of phenanthridin-6(5H)-ones was achieved via copper-catalyzed cyclization of 2-phenylbenzamides using air as the oxidant and KOt-Bu as the base. It was discovered that, besides Ph3P, other ligands such as 1,10-phenanthroline, TMEDA as well as l-proline could also be used as the ligand to effect the transformation. © Georg Thieme Verlag Stuttgart. New York.