Ji S.-Z.,Shanghai University |
Xiao S.-C.,Shanghai University |
Luo P.-F.,Shanghai University |
Huang G.-F.,Shanghai University |
And 4 more authors.
Biomaterials | Year: 2011
How to amplify epidermal stem cells (ESCs) rapidly is a challenging crux in skin tissue engineering research. The present study describes the preparation of 3D micronized (300-600 μm) amniotic membrane (mAM) by means of repeated freeze-thawing cycles to deplete cell components and homogenized with a macrohomogenizer in liquid nitrogen. This newly prepared mAM not only possessed the characteristics of a microcarrier but completely retained the basement membrane structure and abundant active substances such as NGF, HGF, KGF, bFGF, TGF-β1 and EGF in the AM matrix. The result showed that mAM combined with rotary cell culture system (RCCS) was able to amplify ESCs quickly. The relative cell viability at day 7 and 14 was significantly higher than that of the conventional 2D plate culture (326 ± 28% and 535 ± 47% versus 232 ± 21% and 307 ± 32%, P < 0.05). In addition, the new method was able to prevent cell differentiation effectively and retain the characteristics of stem cells. When mAM loaded with ESCs (ESC-mAM) was further transplanted to full-thickness skin defects in nude mice, ESCs survived well and formed a new epidermis. Four weeks after transplantation, papilla-like structures were observed, and collagen fibers were well and regularly arranged in the newly formed dermal layer. In conclusion, the mAM as a novel natural microcarrier possesses an intact basement membrane structure and bioactivities. It not only provides the microenvironment similar to the stem cell niche within the human body favorable for ex vivo culture and amplification of ESCs but can be used as the dermal scaffold in constructing a skin substitute containing ESCs for the repair of full-thickness skin defects. © 2011 Elsevier Ltd.
Yu Z.-Q.,Shanghai University |
Zhang C.,Shanghai University |
Wang H.,Shanghai University |
Lao X.-Y.,Shanghai University |
And 4 more authors.
Diseases of the Colon and Rectum | Year: 2013
OBJECTIVE: This study was designed to verify the effect of AT P-binding cassette subfamily C member 4 on radiosensitivity of locally advanced rectal carcinoma. SETTING: The expression of AT P-binding cassette subfamily C member 4 protein in 121 pretreatment tissue samples from locally advanced rectal carcinoma patients was detected by immunohistochemistry. Design: Pathological response to radiotherapy was evaluated according to tumor regression grading by postoperative histological examinations after they received long-course preoperative neoadjuvant radiotherapy, and the association between clinicopathological data and tumor regression grading was analyzed retrospectively. For further validation, short hairpin RNA was constructed and transfected into colorectal carcinoma cell line HT29. The knockdown efficiency was confirmed at both RNA and protein levels. The altered radiosensitivity was evaluated by methylthiazolyl tetrazolium assay, colony formation assay, flow cytometry, and Hoechst 33258 staining. Results: Univariate analysis revealed that AT P-binding cassette subfamily C member 4 expression (p < 0.001), P53 type (p = 0.069), and CEA (p = 0.100) were possibly associated with tumor regression grading, and multivariate analysis demonstrated that AT P-binding cassette subfamily C member 4 expression (p < 0.001) and P53 type (p = 0.039) were positively correlated with response to neoadjuvant radiotherapy in locally advanced rectal carcinoma patients. Lentiviral vector was successfully introduced into HT29 cells and inhibited AT P-binding cassette subfamily C member 4 expression efficiently and persistently. Downregulation of AT P-binding cassette subfamily C member 4 expression significantly enhanced inhibition of cell proliferation, decreased colony formation capacity, and increased cell apoptosis induced by irradiation, as examined by a series of experiments in vitro. In addition, radiobiological parameters calculated according to the single-hit multitarget model were also decreased significantly. CONCLUSIONS: Our data indicate that AT P-binding cassette subfamily C member 4 may be a useful molecular marker in predicting radiosensitivity, and a potential target in improving the response to neoadjuvant radiotherapy in locally advanced rectal carcinoma patients. © 2013 The ASCRS.
Xue G.,Shanghai University College of Sciences |
Yan H.-L.,Shanghai University College of Sciences |
Zhang Y.,Shanghai University College of Sciences |
Hao L.-Q.,Shanghai University |
And 3 more authors.
Oncogene | Year: 2014
Previous studies have established the link between aberrant microRNA (miRNA) expression and hypoxia in various neoplasms. However, how these hypoxia-related miRNAs modulate tumor progression is still unclear. Therefore, the patterns of miRNA in colorectal carcinoma cell lines in response to hypoxia or not were first screened and the hypoxia-induced repression of the miR-15-16 cluster was confirmed. Then, this repression was found to be associated with high tumor stage and poor prognosis in colorectal carcinoma and is shown to promote tumor angiogenesis and metastasis by the loss of restriction of its target gene, fibroblast growth factor-2 (FGF2). Moreover, the general and alterative promoters of the miR-15-16 host (deleted in lymphocytic leukemia 2, DLEU2) were mapped, and three c-Myc/Max binding sites in response to the hypoxia-induced repression of miR-15-16 were further identified. Finally, an enhanced stability of c-Myc/Max heterodimer promoted by increased hypoxia-inducible factor-2α (HIF-2α) was validated, and we also verified that the enhancement contributed to the hypoxia-induced repression of miR-15-16. In brief, the c-Myc-mediated transcriptional repression of miR-15-16 in hypoxia is induced by increased HIF-2α and promoted tumor angiogenesis and hematogenous metastasis by the further loss of post-transcriptional inhibition of FGF2. Our study provides a better understanding of the coping mechanisms in response to tumor hypoxia and may be helpful in developing an effective prognostic marker or treatment target against solid tumors.Oncogene advance online publication, 7 April 2014; doi:10.1038/onc.2014.82.
Xue-Song L.,Shanghai University |
Cheng-Zhong L.,Shanghai University |
Ying Z.,Shanghai University College of Sciences |
Mo-Bin W.,Shanghai University
BMC Gastroenterology | Year: 2012
Background: Many studies suggest that in chronic hepatitis B virus (HBV) infection regulate T (Treg) cells and interlukin-17-producing T help cells (Th17) are mutually antagonistic in the immune response. This study is aimed to reveal the cell differentiation environment and the significance of Treg and Th17 balance in the development of acute and chronic HBV infection.Methods: Ten patients with acute HBV infection (AHB) and forty-eight patients with chronic HBV infection, including 12 asymptomatic HBV carriers (HBV carriers), 18 chronic hepatitis B patients (CHB) and 18 acute-on-chronic HBV-related liver failure (ACHBLF) were enrolled. Treg and Th17 cells differentiation related cytokine levels were detected by using ELISA. Flow cytometry was employed to count the Treg and Th17 frequency in peripheral blood.Results: Compared to health controls both AHB and ACHBLF patients favoured Th17 cell differentiation, accompanied by a higher proportion of peripheral Th17 cells (P < 0.01) and high level of interleukin-17A (IL-17A) (P < 0.01). However, asymptomatic HBV carriers and CHB were conducive to Treg cell differentiation. In AHB and ACHBLF, peripheral blood IL-17A + CD4 + T cell frequency increased significantly compared with healthy controls. Changes of Treg and Th17 cell frequency were not completely consistent. Both CHB and ACHBLF had lower level of Treg/Th17 ratio than in health control (P < 0.05). Both plasm IL-17A levels (r = -0.72, p<0.001) and Th17 frequency(r = -0.49, p = 0.0003) negatively correlated with plasma HBV DNA load in patients with chronic HBV infection. In addition, both Th17 frequency and plasm IL-17A levels positively correlated with ALT (r = 0.33,p = 0.01 Vs r = 0.29,p = 0.04) and total bilirubin levels (r = 0.72,p<0.0001 Vs r = 0.53,p = 0.0001) in these chronic HBV-infected subjects. However, for AHB there were positive correlation between both Th17 frequency (r = 0.64, p = 0.04) and plasm IL-17A levels (r = 0.69, p = 0.02) with serum ALT levels, but no significant correlation between both HBV DNA level and total bilirubin level with Th17 frequency or plasm IL-17A levels were found. Furthermore, Treg/Th17 ratio was negatively correlated with total bilirubin levels (r = -0.41, p = 0.004) in chronic HBV-infected patients, especially in patients with ACHBLF (r = -0.69,p = 0.001) and positively correlated with viral load in these chronic HBV-infected subjects (r = 0.55, p<0.0001).Conclusions: Th17 cells are involved in acute and chronic HBV infection, especially in AHB and ACHBLF. CHB and ACHBLF patients manifested obvious Treg/Th17 ratio imbalance, which might be linked to disease progression and the continuous HBV infection. © 2012 Liang X-S et al.; licensee BioMed Central Ltd.
Sun C.,Shanghai University College of Sciences |
Yan L.,Shanghai University College of Sciences |
Yue B.,Shanghai University College of Sciences |
Liu H.,Shanghai University College of Sciences |
Gao Y.,Shanghai University
Journal of Materials Chemistry C | Year: 2014
The modulation of metal-insulator transition (MIT) temperature and phase stability of thermochromic materials based on all the transition metal doped VO2 were systematically studied using density functional theory (DFT) calculations. The free energies, formation enthalpies, and Fermi energies of transition metal doped VO2 were evaluated from DFT calculations; the cell volumes and bulk moduli were obtained by fitting the free energies to the Birch-Murnaghan equation of states; and the decomposition enthalpies and entropies of the transition metal doped VO2 were calculated using both experimental data and DFT calculations. Based on these results, the MIT temperature was associated with lattice distortion of VO2 (M1) upon doping, the expansion of cell volume and the decrease in β-angle were associated with the decrease in MIT temperature, and the shrinkage of cell volume and the increase in β-angle were associated with the increase in MIT temperature. And it was also concluded that VO2 (M1) doped with high valence cations is more stable than those doped with low valence cations. These conclusions are consistent with experimental facts that W-, Mo-, and Re- are the most studied and the most effective dopants for the reduction of MIT temperature, and La-, Hg-, and Ag-doped VO2 undergoes phase separation. In addition, DFT calculations without spin-polarization were also carried out, and the influence of spin-polarization was evaluated. Finally, scandium was proposed as a potential dopant for VO2 in view of balanced comprehensive performance. © 2014 the Partner Organisations.
Liang X.-S.,Shanghai University |
Li C.-Z.,Shanghai University |
Zhou Y.,Shanghai University |
Zhou Y.,Shanghai University College of Sciences |
And 3 more authors.
World Journal of Gastroenterology | Year: 2014
AIM: To longitudinally investigate cytokine gene expression and protein levels in Th17 and Treg cells, to observe T-cell phenotypes during hepatitis B virus (HBV)-related acute-on-chronic liver failure (ACHBLF) and to analyze changes in Th17 and Treg phenotypes during disease progression. METHODS: We measured the expression of seven Th17/Treg differentiation-related genes and serum concentrations of the corresponding cytokines in 18 ACHBLF, 18 chronic hepatitis B (CHB) disease controls and 10 healthy controls (HCs) by real-time quantitative PCR and enzyme linked immunosorbent assay. Peripheral Th17 and Treg cell frequencies were analyzed by flow cytometry. RESULTS: From the onset of ACHBLF, patients presented with a conductive Th17 differentiation cytokine environment accompanied by high Th17 frequency and high serum IL-17 levels, which were sustained throughout the disease course. The Treg-related cytokine IL-2 and Foxp3 were also up-regulated from disease onset, and Foxp3 gene expression showed a gradually increasing trend during ACHBLF. The circular phenotype of Treg and Th17 cells showed changes from the onset of ACHGLF. At disease onset, Th17 frequency increased significantly compared with both CHB and HCs, but Treg cell frequency decreased significantly compared with CHB. During the ACHBLF event, Th17 frequency remained higher compared with HCs, but decreased sharply from the peak point to the recovery point; Treg cell frequency increased gradually during the ACHBLF event. Treg and Th17 cell counts correlated with ACHBLF development; in all patients, serum IL-17 levels significantly correlated with patient serum ALT levels. In survivors, Th17 frequency at the onset point and the Treg to Th17 ratio at the peak point correlated with the patient's model for end stage liver disease (MELD) plus sodium (MELD-Na) score. The Treg to Th17 ratio and the Th17 frequency at onset were significant predictors of patient survival. Low Treg/Th17 cell ratios at the onset predicted poor survival. Survivors exhibited an initial decrease in the circulating Treg/Th17 ratio from the onset to the peak time, and subsequently displayed a continuous increase. CONCLUSION: Treg and Th17 cells showed changes in genes, protein levels and T cell phenotypes during ACHBLF events. An increased Treg/Th17 ratio was associated with the survival of ACHBLF patients. © 2014 Baishideng Publishing Group Inc. All rights reserved.
Zhang M.,Shanghai University |
Zhang C.,Shanghai University |
Sun Q.,Shanghai University College of Sciences |
Cai Q.,Shanghai University |
And 2 more authors.
BMC Medical Informatics and Decision Making | Year: 2014
Background: As a part of nationwide healthcare reforms, the Chinese government launched web-based appointment systems (WAS) to provide a solution to problems around outpatient appointments and services. These have been in place in all Chinese public tertiary hospitals since 2009. Methods. Questionnaires were collected from both patients and doctors in one large tertiary public hospital in Shanghai, China.Data were analyzed to measure their satisfaction and views about the WAS. Results: The 1000 outpatients randomly selected for the survey were least satisfied about the waiting time to see a doctor. Even though the WAS provided a much more convenient booking method, only 17% of patients used it. Of the 197 doctors surveyed, over 90% thought it was necessary to provide alternative forms of appointment booking systems for outpatients. However, about 80% of those doctors who were not associated professors would like to provide an 'on-the-spot' appointment option, which would lead to longer waits for patients. Conclusions: Patients were least satisfied about the waiting times. To effectively reduce appointment-waiting times is therefore an urgent issue. Despite the benefits of using the WAS, most patients still registered via the usual method of queuing, suggesting that hospitals and health service providers should promote and encourage the use of the WAS. Furthermore, Chinese health providers need to help doctors to take others' opinions or feedback into consideration when treating patients to minimize the gap between patients' and doctors' opinions. These findings may provide useful information for both practitioners and regulators, and improve recognition of this efficient and useful booking system, which may have far-reaching and positive implications for China's ongoing reforms. © 2014 Zhang et al.; licensee BioMed Central Ltd.
Jiang P.,Shanghai JiaoTong University |
Li C.,Shanghai JiaoTong University |
Xiang Z.,Shanghai University College of Sciences |
Jiao B.,Shanghai University College of Sciences
Molecular Medicine Reports | Year: 2014
Tanshinone IIA (Tan IIA), one of the major active constituents of the medicinal herb Salvia miltiorrhiza, has been reported to possess neuroprotective effects against the pathological features of Alzheimer's disease (AD), but the molecular mechanism underlying this effect remains unclear. To examine the effect of Tan IIA on AD, as well as the underlying molecular mechanisms, in vivo animal experiments and in vitro molecular biology investigations were employed in the present study. Firstly, a rat model of AD was successfully established by direct injection of the amyloid beta protein (Aβ) and then these rats were administered an interventional treatment of Tan IIA. The learning and memory ability of rats was evaluated in four groups (Control, Sham, AD and Tan IIA) utilizing a Morris water maze test. Quantitative (q)PCR was employed to detect the mRNA expression of inducible nitric oxide synthase (iNOS), matrix metalloproteinase-2 (MMP-2) and nuclear transcription factor kappa (NF-κBp65) in temporal lobe tissues and protein expression was determined with western blot analysis. In addition, association analyses between iNOS, MMP-2 and NF-κBp65 at a transcriptional and translational level were performed utilizing Spearman's correlation analysis. In the present study, the results revealed that rats in the AD group demonstrated significant disruptions in learning and memory ability, and the symptoms were evidently reduced by Tan IIA. Furthermore, the upregulation of iNOS, MMP-2 and NF-κBp65 at a transcriptional and translational level in AD rats was distinctly inhibited by Tan IIA. Therefore, it was concluded that iNOS, MMP-2 and NF-κBp65 are involved in AD development, and Tan IIA may reduce AD risk by inhibiting transcription and translation of these genes. Furthermore, the positive correlation of iNOS and MMP-2 with NF-κBp65, respectively, provides evidence supporting the hypothesis that Tan IIA reduces AD risk by inhibiting iNOS and MMP-2 at a transcriptional and translational level through the NF-κB pathway. In summary, Tan IIA is an effective neuroprotective agent for AD therapy, and iNOS, MMP-2 and NF-κBp65 may be the potential molecular targets for manipulating this effect therapeutically.
Tang Y.,Shanghai University College of Sciences |
Wang F.,East China University of Science and Technology |
Jin C.,Shanghai University College of Sciences |
Liang H.,Henan Normal University |
And 2 more authors.
Environmental Toxicology and Pharmacology | Year: 2013
The nanosized titanium dioxide (nano-TiO2) is an important nanoscale compound applied in many different fields because of its superior performance. Here, an anatase nano-TiO2 showed cytotoxicity in a dosage-dependent manner, which was in accordance with changes of A549 cell ultrastructure, A549 cell viability and intracellular ATP level. The lungs of rats treated with single intratracheal instillation of nano-TiO2 were injured, which was demonstrated by changes of alveolar epithelial cell ultrastructure, lung tissue pathology and lung tissue MDA level. The results of this study indicated that nano-TiO2 should be related to the generation of intracellular reactive oxygen species (ROS), which injured mitochondria and prevented the synthesis of ATP. The cells were approaching to apoptosis eventually. In macroscopic view, the lungs inevitably suffered. © 2013 Elsevier B.V.
Guo Y.-J.,Shanghai University College of Sciences |
Wang K.-Y.,Shanghai University College of Sciences |
Sun S.-H.,Shanghai University College of Sciences
Microbes and Infection | Year: 2010
Leptospirosis is an important zoonosis in humans. Immunity against leptospiral infection was thought to be primarily humoral, and limited studies have addressed the role of CD8+ T cells. Leptospiral immunoglobulin-like protein A (LigA) is an important protective antigen of Leptospira and a potential target for Leptospira-specific cell-mediated immunity. In this study, twenty LigA-derived peptides were tested their binding affinity and stability for the HLA-A*0201 molecule. Peptides with high binding affinity and stability for HLA-A*0201 were then assessed their capacity to elicit specific cytotoxic T-lymphocyte (CTL) responses using cytotoxicity, ELISPOT assays for IFN-γ and HLA-A*0201-peptide tetramer assays. We identified a HLA-A*0201-restricted epitope, LigA305-313 KLIVTPAAL in Leptospira LigA. CTLs specific for LigA305-313 were elicited both in HLA-A2.1/Kb transgenic mice and in patients with a clinical and/or laboratory diagnosis of leptospirosis. Staining of the HLA-A*0201-LigA305-313 tetramer revealed the presence of LigA305-313-specific CTLs in peripheral blood mononuclear cells (PBMCs) sourced from five patients infected with three different serovars of Leptospira. In conclusion, we report the existence of specific cytotoxic CD8+ T cells in patients with leptospirosis and we suggest that the newly identified epitope, LigA305-313, will be helpful in enhancing the understanding of the mechanism of immunity to leptospirosis. © 2010 Elsevier Masson SAS. All rights reserved.