351
|
Chu L, Gu J, Sun L, Qian Q, Qian C, Liu X. Oncolytic adenovirus-mediated shRNA against Apollon inhibits tumor cell growth and enhances antitumor effect of 5-fluorouracil. Gene Ther 2008; 15:484-94. [PMID: 18239605 DOI: 10.1038/gt.2008.6] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Apollon, a membrane-associated inhibitor of apoptosis protein, protects cells against apoptosis and is upregulated in certain tumor cells. In this study, the effects of Apollon protein knockdown by RNA interference on the growth of human HeLa, HT-1080 and MCF-7 cells in vitro and in vivo were investigated. An oncolytic adenovirus (ZD55) containing the RNA polymerase III-dependent U6 promoter to express short hairpin RNA (shRNA) directed against Apollon (ZD55-siApollon) was constructed. Our data show that ZD55-siApollon successfully exerts a gene knockdown effect and causes the inhibition of tumor cell growth both in culture and in athymic mice in vivo. Cell cycle analysis, 4',6-diamidino-2-phenylindole staining and western blot analysis reveal that ZD55-siApollon-mediated suppression of Apollon induces apoptosis. Intratumoral injection of ZD55-siApollon significantly inhibits tumor growth in HT-1080 xenograft mice. Furthermore, ZD55-siApollon enhances the antitumor effect of 5-fluorouracil, a chemotherapeutic agent. In conclusion, these results suggest that the depletion of Apollon by oncolytic adenovirus-shRNA delivery system provides a promising method for cancer therapy.
Collapse
|
352
|
Gu J, Chen W, Yu T, Lu P, Mu X, Xu J. Detection of cyclic nucleotide phosphodiesterase
mRNA in mouse skeletal muscle tissue
and primary cultured myocytes. JOURNAL OF ANIMAL AND FEED SCIENCES 2007. [DOI: 10.22358/jafs/66826/2007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
353
|
Zhou J, Wei Y, Liu D, Ge X, Zhou F, Yun X, Jiang J, Gu J. Identification of 1,4GalT II as a Target Gene of p53-mediated HeLa Cell Apoptosis. J Biochem 2007; 143:547-54. [DOI: 10.1093/jb/mvn003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
354
|
Liu P, Goddard JD, Arsenault G, Gu J, McAlees A, McCrindle R, Robertson V. Theoretical studies of the conformations and 19F NMR spectra of linear and a branched perfluorooctanesulfonamide (PFOSAmide). CHEMOSPHERE 2007; 69:1213-20. [PMID: 17640706 DOI: 10.1016/j.chemosphere.2007.06.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2006] [Revised: 05/31/2007] [Accepted: 06/01/2007] [Indexed: 05/16/2023]
Abstract
Technical perfluorooctanesulfonate (PFOS) and its derivatives, such as perfluorooctanesulfonamide (PFOSA), are not clean compounds but, instead, complex mixtures of linear and branched isomers, and other compounds including sulfonate homologues. Questions have been raised as to whether the linear and the branched isomers behave differently in the environment. However, little is known about the physical properties or the finer details of the structures of the individual branched isomers. This study sought an effective computational method to model the preferred conformations of PFOS derivatives, and the energy differences between them and to determine if these results can be used to explain the temperature dependence of their NMR spectra. Good predictions of the 19F chemical shifts were obtained for some PFOSA-type molecules with a computational approach [B3LYP-GIAO/6-31++G(d,p)//B3LYP/6-31G(d,p)] that is relatively inexpensive. Large 5JFF couplings found in one of the branched isomers could be rationalized on the basis of the relevant F-F distances in the optimized structure. At low temperatures, the splitting observed in the NMR spectrum at C-1 for these sulfonamides can be explained by the existence of the two conformers predicted by the computations.
Collapse
|
355
|
Wu AW, Gu J, Wang J, Ye SW, An Q, Yao YF, Zhan TC. Results after change of treatment policy for rectal cancer – report from a single hospital in China. Eur J Surg Oncol 2007; 33:718-23. [PMID: 17240113 DOI: 10.1016/j.ejso.2006.12.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Accepted: 12/05/2006] [Indexed: 10/23/2022] Open
Abstract
BACKGROUND Great changes have occurred in the management of rectal cancer. This study presents the outcome of total mesorectal excision (TME) for rectal cancer in a single Chinese institution and evaluates TME's role in the comprehensive management of rectal cancer. METHODS We reviewed the data of rectal cancer patients surgically treated by three colorectal surgeons from January 2000 to August 2004. Patients who received surgical resection for rectal cancer from January 1996 to December 1999, before the introduction of TME, were chosen as controls. Data regarding characteristics of patients and tumors, surgical procedures, postoperative complications, and results of follow-up were collected for analysis. RESULTS Three hundred and seventy-seven patients with rectal cancer were enrolled in our study, with 175 patients in the TME group and 202 as controls. Mortality and morbidity rates were 1% and 14% in TME patients and 1% and 31% in controls, respectively. The TME group had a shorter operation time and hospital stay, and less bleeding, wound and urinary complications. The local recurrence (LR) rate was 6% and 12% in the TME and the control groups, respectively (P<0.05). With a median follow-up of 35 months, the actuarial 5-year survival rate was 66%. Consistent with the univariate analysis result, multivariate analysis demonstrated that TNM stage, tumor grade, age, and surgeons were independent prognostic factors. TME was not an independent prognostic factor for patients' survival. CONCLUSIONS TME is a safe and efficient option in reducing LR. However, it is not an independent predictor for patients' survival. In addition to the standardized usage of TME, further knowledge on the molecular mechanism of cancer is needed.
Collapse
|
356
|
Milam MR, Gu J, Yang H, Celestino J, Wu W, Horwitz I, Lacour RA, Westin SN, Gershenson DM, Wu X, Lu KH. STK15 F31I polymorphisms and uterine cancer risk: A case-control analysis. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.5511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
5511 Background: STK15 is a serine threonine kinase which assists chromosomal separation and mitotic spindle stability through interaction with the centrosome during mitosis. STK15 polymorphisms have been associated with an increased risk for breast cancer in several case-control studies. We hypothesized that STK15 polymorphisms might modulate risk of uterine cancer. Methods: Uterine cancer patients treated at M. D. Anderson Cancer Center were identified from the tumor bank database from January 1, 2000 to June 30, 2006. Two common STK15 single nucleotide polymorphisms (SNPs), F31I (T/A) and V57I (G/A), were genotyped in patients with uterine cancer and in a control population matched for age, race, and smoking status. Odds ratios (OR) and 95% confidence intervals (CI) were obtained using unconditional logistic regression analysis. Results: A total of 193 women with uterine cancer and 218 controls were genotyped for both SNPs. After adjustment for age, race, and smoking status for the F31I SNP, the homozygous variant genotype (AA) was associated with a significantly increased uterine cancer risk (OR 10.2; 95% CI 2.23–46.5). Individuals with the heterozygous genotype (TA) and a history of tobacco use also exhibited an increased risk for uterine cancer (OR 2.63; 95% CI 1.20–5.76). For the V57I SNP, neither the homozygous (AA) nor the heterozygous (GA) variant genotypes were associated with significantly altered risk for uterine cancer (OR 0.76; 95% CI 0.18–3.25 and OR 0.88; 95% CI 0.52–1.49). Conclusions: Our study demonstrates that STK15 F31I SNP is associated with an increased risk for uterine cancer. Confirmation of this pilot study is needed in a larger case-control population to evaluate this genetic variant with other known risk factors for uterine cancer. No significant financial relationships to disclose.
Collapse
|
357
|
Zhu X, Wang B, Zhao G, Gu J, Chen Z, Briantais P, Andres P. An investigator-masked comparison of the efficacy and safety of twice daily applications of calcitriol 3 µg/g ointment vs. calcipotriol 50 µg/g ointment in subjects with mild to moderate chronic plaque-type psoriasis. J Eur Acad Dermatol Venereol 2007; 21:466-72. [PMID: 17373972 DOI: 10.1111/j.1468-3083.2006.01913.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Calcitriol and calcipotriol, two vitamin D derivatives, are available for topical treatment of psoriasis and have been shown to be effective. AIM To compare the efficacy and safety of calcitriol 3 microg/g and calcipotriol 50 microg/g. METHODS This was a multicentre, randomized, investigator-masked, and parallel comparison in subjects with mild to moderate chronic plaque-type psoriasis receiving either calcitriol or calcipotriol ointment twice daily for 12 weeks. Efficacy evaluations comprised global improvement (on a 4-point scale from 0: no change or worse, to 3: clear or almost clear) assessed by the investigator and by the subject. Efficacy further included the 'dermatological sum score' at each study visit. Safety evaluations included adverse event reporting, cutaneous safety assessed by the investigator and cutaneous discomfort assessment by the subject (both on a 5-point scale from 0: none, to 4: very severe). RESULTS A total of 250 subjects of both gender were recruited. At week 12, the LSmean score of global improvement rated by the investigator was 2.27 for calcitriol and 2.22 for calcipotriol. This difference was not statistically significant, with calcitriol demonstrating to be non-inferior to calcipotriol for global improvement. This same parameter was scored by the subject, with a mean of 2.12 for calcitriol and 2.09 for calcipotriol. The percentage of patients with at least marked improvement tended to be in favour of calcitriol (95.7% vs. 85% for calcipotriol). However, differences were not statistically significant. The mean worst score for the cutaneous safety assessment was higher in the calcipotriol group (0.3 vs. 0.1 and 0.4 vs. 0.2, by the investigator and the patient, respectively). These differences were statistically significant in favour of a better safety profile for calcitriol (P=0.0035). Fourteen dermatological and treatment-related adverse events were reported with calcipotriol vs. only five with calcitriol for a total of 22 adverse events reported throughout the study. CONCLUSION Calcitriol administered twice daily over a 12-week treatment period demonstrated similar efficacy to calcipotriol, while showing a significantly better safety profile.
Collapse
|
358
|
Gu J, Wang ET, Chen WX. Genetic diversity of rhizobia associated with Desmodium species grown in China. Lett Appl Microbiol 2007; 44:286-92. [PMID: 17309506 DOI: 10.1111/j.1472-765x.2006.02071.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS Desmodia are leguminous plants used as important forage and herbal medicine in China. Little information is available about the nodule bacteria of Desmodium species. To understand the genetic diversity of rhizobia associated with Desmodium species grown in China, isolates from temperate and subtropical regions were obtained and analysed. METHODS AND RESULTS A total of 39 rhizobial strains isolated from 9 Desmodium species grown in China were characterized by PCR-based 16S rDNA gene and 16S-23S rDNA intergenic spacer gene restriction fragment length polymorphism (RFLP) and 16S rRNA gene sequencing. The results showed high diversity among rhizobia symbiotic with Desmodium species. Most microsymbionts of Desmodium species belonged to Bradyrhizobium closely related to Bradyrhizobium elkanii, Bradyrhizobium japonicum and Bradyrhizobium yuanmingense. Several small groups or single strain were related to Rhizobium, Sinorhizobium or Mesorhizobium. CONCLUSIONS Desmodium species formed nodules with diverse rhizobia in Chinese soils. SIGNIFICANCE AND IMPACT OF THE STUDY These results offered the first systematic information about the microsymbionts of desmodia grown in the temperate and subtropical regions of China.
Collapse
|
359
|
Kallam S, Sangrampurkar R, Azimadeh D, Gu J, Kon Z, Griffith B, Poston R. P162. J Surg Res 2007. [DOI: 10.1016/j.jss.2006.12.498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
360
|
Qiu Y, Su M, Liu Y, Chen M, Gu J, Zhang J, Jia W. Application of ethyl chloroformate derivatization for gas chromatography-mass spectrometry based metabonomic profiling. Anal Chim Acta 2006; 583:277-83. [PMID: 17386556 DOI: 10.1016/j.aca.2006.10.025] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2006] [Revised: 09/27/2006] [Accepted: 10/13/2006] [Indexed: 12/23/2022]
Abstract
A new combined gas chromatography and mass spectrometry (GC-MS) method has been developed suitable for the urine sample treatment in aqueous phase with ethyl chloroformate (ECF) derivatization agents. The method has been extensively optimized and validated over a broad range of different compounds and urine samples. Analysis of test metabolite derivatives, containing spiked standards, or rat urine exhibited acceptable linearity, satisfactory intra-batch precision (repeatability) and stability, relative standard deviations (R.S.D.) less than 10 and 15% within 48 h, respectively. The quantification limits were 150-300 pg on column for most metabolites. Recovery of several representative compounds, at different concentrations, ranged from 70 to 120%, with R.S.D. better than 10% for rat urine. We were able to generally eliminate potentially confounding variables such as medium complexity, different urea concentrations, and/or derivatization procedure variability. Metabonomic profiling of 1,2-dimethylhydrazine (DMH)-induced precancerous colon rat urine using GC-MS with ECF derivatization was performed to evaluate the proposed method. The analytical variation of the method was smaller than the biological variation in the rat urine samples, proving the suitability of the method to analyze differences in the metabonome of a living system with perturbed metabolic network. Thus, the proposed GC-MS analytical method is reliable to analyze a large variety of metabolites and can be used to investigate human pathology including disease onset, progression, and mortality.
Collapse
|
361
|
Jiang B, Zhu ZZ, Liu F, Hou LF, Gu J, Chen E, Tzeng CM, Zhu G. Prevalence of Mutation in the Epidermal Growth Factor Receptor Gene in Chinese Patients with Non-small Cell Lung Cancer. Clin Oncol (R Coll Radiol) 2006; 18:635. [PMID: 17051955 DOI: 10.1016/j.clon.2006.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
362
|
Qi R, Gu J, Zhang Z, Yang K, Li B, Fan J, Wang C, He Z, Qiao L, Lin Z, Liu XY. Potent antitumor efficacy of XAF1 delivered by conditionally replicative adenovirus vector via caspase-independent apoptosis. Cancer Gene Ther 2006; 14:82-90. [PMID: 17008933 DOI: 10.1038/sj.cgt.7700992] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
XAF1 is a newly identified tumor-suppressor gene that can antagonize XIAP and sensitize cells to other cell death triggers. In this study, we utilized ZD55, a conditionally replicative adenovirus (CRAd) similar to ONYX-015 as the vector to transfer XAF1 into the tumor cells to evaluate its antitumor efficacy in vitro and in vivo. Potent and specific cytopathic effect (CPE) was observed upon infection with ZD55-XAF1 in tumor cell lines. Importantly, ZD55-XAF1 exhibited a superior suppression of tumor growth in an animal model of colorectal carcinoma in nude mice compared with Ad-XAF1 (E1-deleted replication-defective viral) and ONYX-015. Complete eradication of the established tumors was observed in four of eight mice. Our data also showed that infection with ZD55-XAF1 resulted in caspase-independent apoptosis. Although caspase-3, poly(ADP-ribose) polymerase were mildly activated in response to ZD55-XAF1 infection, pretreatment with pan-caspase inhibitor hardly influence its apoptosis-inducing activity. In summary, our study strongly suggested that ZD55-XAF1 could serve as an effective gene-virotherapy strategy and has highly potential against human cancers.
Collapse
|
363
|
Zhao L, Dong A, Gu J, Liu Z, Zhang Y, Zhang W, Wang Y, He L, Qian C, Qian Q, Liu X. The antitumor activity of TRAIL and IL-24 with replicating oncolytic adenovirus in colorectal cancer. Cancer Gene Ther 2006; 13:1011-22. [PMID: 16799468 DOI: 10.1038/sj.cgt.7700969] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Melanoma differentiation associated gene-7 (Mda-7)/IL-24 was previously cloned into ZD55 (an adenovirus with E1B55 deleted) to form ZD55-IL-24, which had much better antitumor effect than Ad-IL-24. According to its good antitumor properties, ZD55-IL-24 has been used in preclinical studies. But ZD55-IL-24 alone still could not completely eradicate established tumors in all nude mice. It was reported that IL-24 could induce and enhance the activity of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) (a member of tumor necrosis factor (TNF) superfamily). Accordingly, the combined use of ZD55-IL-24 and ZD55-TRAIL was carried out in this study. Treatment with both ZD55-IL-24 and ZD55-TRAIL could induce more significant apoptosis in cancer cells in vitro compared with ZD55-IL-24 or ZD55-TRAIL alone. The combination of the two replicative adenoviruses had better antitumor activity in vivo than that of single oncolytic adenovirus and led to complete eradication of xenograft tumors in all treated mice. Upregulation of TRAIL was observed in tumor cells infected with ZD55-IL-24 and studies of the apoptotic cascade regulators indicate that ZD55-IL-24 could further enhance the activation of apoptosis through the TNF family of death receptors. We demonstrated for the first time the potential therapeutic effect of combined ZD55-IL-24 with ZD55-TRAIL for the targeted therapy of cancer.
Collapse
|
364
|
Wei J, Sun Z, Chen Q, Gu J. Serum deprivation induced apoptosis in macrophage is mediated by autocrine secretion of type I IFNs. Apoptosis 2006; 11:545-54. [PMID: 16532277 DOI: 10.1007/s10495-006-5146-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Apoptosis can be triggered by different forms of cellular stress. We here show that serum deprivation induces the expression and secretion of type I interferons and results in apoptosis in RAW 264.7 cell in a caspase dependent manner. Administration of either IFN-alpha or IFN-beta antibody partially inhibits apoptosis while the two antibodies used together totally prevents RAW264.7 cell from apoptosis. GM-CSF, but not M-CSF and IL-3, protects serum deprivation induced apoptosis. Inhibition of JAKs also prevents macrophages from apoptosis. Activation of MAPKs is not required for serum deprivation induced apoptosis. Our results are the first to demonstrate that serum deprivation-induced apoptosis acts through autocrine secretion of type I interferons.
Collapse
|
365
|
Poston R, Gu J, Kwon M, Reicher B, Zimrin D, Griffith B. Thrombin is generated after the hybrid procedure despite heparinization at a rate that equals conventional CABG after protamine. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
366
|
Collins M, Ozeki T, Kwon M, Gu J, Pierson R, Poston R. 170. J Heart Lung Transplant 2006. [DOI: 10.1016/j.healun.2005.11.177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
367
|
Shen W, Gu J, Shen Y. Permanent magnetic system design for the wall-climbing robot. Appl Bionics Biomech 2006. [DOI: 10.1533/abbi.2006.0024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
368
|
Zhu KE, Gu J, Zhang T. Allogeneic stem cell transplantation from unrelated donor for class 3 β-thalassemia major using reduced-intensity conditioning regimen. Bone Marrow Transplant 2005; 37:111-2. [PMID: 16258532 DOI: 10.1038/sj.bmt.1705205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
369
|
Gu J, Li H, Li M, Vuong C, Otto M, Wen Y, Gao Q. Bacterial insertion sequence IS256 as a potential molecular marker to discriminate invasive strains from commensal strains of Staphylococcus epidermidis. J Hosp Infect 2005; 61:342-8. [PMID: 16242209 DOI: 10.1016/j.jhin.2005.04.017] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2004] [Accepted: 04/11/2005] [Indexed: 11/17/2022]
Abstract
The skin commensal Staphylococcus epidermidis has become one of the most important causative agents of nosocomial infections associated with medical devices. Differentiation between invasive S. epidermidis and its commensal counterpart is crucial for clinical decision making. The ica gene locus, which codes for production of polysaccharide intercellular adhesion (PIA), represents a frequently suggested molecular marker for infectivity. Our data demonstrated that production of PIA was not significantly increased among clinical strains, which may explain the controversial results obtained previously on the correlation of ica presence with origin from infection. Therefore, in this study, we attempted to identify novel genes discriminating between invasive and commensal strains based on the comparison of genome sequences. Our results indicated that the bacterial insertion sequence element IS256 occurred significantly more frequently in strains of clinical origin. Importantly, IS256 might thus constitute a molecular marker to discriminate invasive strains from commensal strains of S. epidermidis.
Collapse
|
370
|
Li W, Zheng X, Gu J, Hunter J, Ferrell GL, Lupu F, Esmon NL, Esmon CT. Overexpressing endothelial cell protein C receptor alters the hemostatic balance and protects mice from endotoxin. J Thromb Haemost 2005; 3:1351-9. [PMID: 15978090 DOI: 10.1111/j.1538-7836.2005.01385.x] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Previous studies have shown that blocking endothelial protein C receptor (EPCR)-protein C interaction results in about an 88% decrease in circulating activated protein C (APC) levels generated in response to thrombin infusion and exacerbates the response to Escherichia coli. To determine whether higher levels of EPCR expression on endothelial cells might further enhance the activation of protein C and protect the host during septicemia, we generated a transgenic mouse (Tie2-EPCR) line which placed the expression of EPCR under the control of the Tie2 promoter. The mice express abundant EPCR on endothelial cells not only on large vessels, but also on capillaries where EPCR is generally low. Tie2-EPCR mice show higher levels of circulating APC after thrombin infusion. Upon infusion with factor Xa and phospholipids, Tie2-EPCR mice generate more APC, less thrombin and are protected from fibrin/ogen deposition compared with wild type controls. The Tie2-EPCR animals also generate more APC upon lipopolysaccharide (LPS) challenge and have a survival advantage. These results reveal that overexpression of EPCR can protect animals against thrombotic or septic challenge.
Collapse
|
371
|
Zhao L, Liao Z, Yu D, Li T, Gu J. Evaluation of the European Spondyloarthropathy Study Group (ESSG) classification criteria in a Chinese population. Clin Exp Rheumatol 2005; 23:397-9. [PMID: 15971431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
OBJECTIVE To evaluate for thefirst time in a Chinese population, the usefulness of the European Spondyloarthropathy Study Group (ESSG) criteria. METHODS A total of 193 clinically diagnosed SpA patients were compared to 166 patients with other types of arthritis, using the parameters listed in the ESSG criteria. RESULTS The sensitivity and specificity of the ESSG criteria in this Chinese population were high at 85.4% and 96.4% respectively. CONCLUSION The use of ESSG criteria for classifying SpA in Chinese will not lead to significant omission of SpA patients or inclusion of patients who do not have SpA.
Collapse
|
372
|
Gu J, Wang L, Che Y, Liu L, Jiang L, Dong S, Li W, Li Q. Morphological alteration and biological properties of hepatocytes not related to tumorigenesis following transfection with HCV core protein. J Viral Hepat 2005; 12:20-6. [PMID: 15655044 DOI: 10.1111/j.1365-2893.2005.00539.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
The hepatitis C virus (HCV) core protein is supposed to play a critical role in HCV-mediated human liver disease with its capabilities to regulate the growth rate of hepatocytes and to partially contribute to the pathogenesis of hepatocellular carcinoma in association with cellular oncogenes. In this study, to analyse the possible pathological mechanism of the HCV core protein, human primary embryo hepatocytes transfected with HCV core were monitored by immunofluorescence, reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot. The morphological changes and biological properties of the transfected hepatocytes were also studied. The results showed that the HCV core gene integrated in the cellular genome and the protein expressed in the transfected hepatocyte, could be detected following serial passage at both the mRNA and protein level. The proliferation assays indicated that hepatocytes transfected with the HCV core gene alone did not exhibit any tumorigenic tendency. Meanwhile, the morphological alterations of these cells demonstrated obvious changes in size, and large vacuolar degeneration. In conclusion, the hepatocytes transfected with the HCV core gene revealed that the core protein expressed induced pathological changes of degeneration, probably related indirectly to tumorigenicity.
Collapse
|
373
|
Rìos J, Ghinelli E, Gu J, Dartt D. Presence and Localization of Neurotrophins and Neurotrophin Receptors in Rat Conjunctiva and their Role in Stimulating Goblet Cell Secretion. Ocul Surf 2005. [DOI: 10.1016/s1542-0124(12)70537-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
374
|
Rihl M, Gu J, Baeten D, Märker-Hermann E, Goodall JC, Gaston JSH, Kuipers JG, Zeidler H, Yu DTY. Alpha beta but not gamma delta T cell clones in synovial fluids of patients with reactive arthritis show active transcription of tumour necrosis factor alpha and interferon gamma. Ann Rheum Dis 2004; 63:1673-6. [PMID: 15547094 PMCID: PMC1754847 DOI: 10.1136/ard.2003.018192] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To compare the cytokine expression profile of three CD8+, three CD4+, and three gammadelta+ T cell clones all derived from the synovial fluids of three patients with reactive arthritis (ReA). METHODS Complementary DNA based microarrays containing the specific sequence of 56 cytokine transcripts were used for screening. Selected genes were confirmed by reverse transcriptase-polymerase chain reaction assay. RESULTS Microarray showed that transcripts encoding for interferon gamma and tumour necrosis factor alpha were expressed by all CD8+ and CD4+ T cell clones. However, gammadelta+ T cells predominantly expressed transforming growth factor beta2 and granulocyte monocyte-colony stimulating factor. CONCLUSION T lymphocyte clones from the joint of patients with ReA exhibit differential cytokine expression profiles. CD8+ and CD4+ T cells demonstrate a Th1 mediated profile, whereas gammadelta+ T cells show a more heterogeneous and less proinflammatory Th3 driven pattern.
Collapse
|
375
|
Rihl M, Baeten D, Seta N, Gu J, De Keyser F, Veys EM, Kuipers JG, Zeidler H, Yu DTY. Technical validation of cDNA based microarray as screening technique to identify candidate genes in synovial tissue biopsy specimens from patients with spondyloarthropathy. Ann Rheum Dis 2004; 63:498-507. [PMID: 15082479 PMCID: PMC1755002 DOI: 10.1136/ard.2003.008052] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES To validate the use of cDNA based microarray on synovial biopsies by analysing the experimental variability due to amplification of RNA, reproducibility of the assay, heterogeneity of the tissue, and statistical analysis. METHODS Total RNA was extracted from three spondyloarthropathy (SpA) and three osteoarthritis (OA) synovial tissue biopsy specimens and from the peripheral blood mononuclear cells (PBMC) of four healthy donors. Exponential RNA amplification by SMART-PCR was compared with linear amplification. Reproducibility was tested by comparing different microarray systems and by performing duplicate experiments. Sample heterogeneity was assessed by comparing overall gene expression profiles, histopathology, and analysis of genes expressed in the synovium and normal PBMC. Statistical analysis using t test and Bonferroni adjustment was verified by permutation of class labels. RESULTS Gene expression was concordant in 12/14 (86%) cytokine/chemokine genes between both microarrays and different RNA amplification systems. When one microarray system was used, expressed genes were 78-95% concordant in duplicate experiments. Gene expression profiles had a higher degree of similarity between SpA synovium than between PBMC or OA synovium despite clear histopathological differences between synovial samples. Comparison of SpA synovium with OA synovium and with PBMC yielded 11 and 18 expressed transcripts, respectively; six were shared in both comparisons. Permutations of SpA and OA samples yielded only one expressed gene in 19 comparisons. CONCLUSIONS These data provide evidence that microarrays can be used for analysis of synovial tissue biopsies with high reproducibility and low variability of the generated gene expression profiles.
Collapse
|