[Incidence and risk factors of recurrence after endovascular treatment of vertebrobasilar dissecting aneurysms]

Objective: To evaluate the incidence and risk factors of recurrence after endovascular treatment of vertebrobasilar dissecting aneurysms (VBDAs). Methods: Retrospective analysis was used for the clinical information of 40 cases of vertebrobasilar dissecting aneurysms treated with endovascular methods in our department between January 2007 and December 2015.According to whether recurrence occurred, the patients were divided into recurrence group (10 patients) and non-recurrence group (30 patients). The data of the patients' age, sex, hypertension history, smoking history, aneurismal size, presenting symptoms, degree of embolization, GCS scores, aneurismal localization and treatment methods were analyzed to evaluate the risk factors for recurrence after endovascular treatment. Results: There were 40 patients performed long-term angiographic follow-up.The recurrence rate after endovascular treatment was 25.0% (10/40) in the present study, and they all occurred in reconstructive group.Among the patients who underwent stent-assisted coil embolization, recurrence in aneurismal body occurred in 6 patients, and recurrence in aneurismal neck 3 cases. In these cases, 7 recurrences occurred with complete embolization, and 2 recurrences occurred with partial embolization.Recurrence occurred in 1 case that underwent single stent placement.The incidence of recurrence in reconstructive group was higher than that in destructive group (33.3% vs 0.0) with significant difference. Conclusions: The recurrence rate was high in VBDAs treated with endovascular methods.The only independent risk factor for recurrence was reconstructive methods and that suggests the necessity of long-term angiographic follow-up.

Transcriptome analysis of miRNA-lncRNA-mRNA interactions in the malignant transformation process of gastric cancer initiation

Gastric cancer is a common heterogeneous malignancy that is pathologically characterized by the development of chronic atrophic gastritis and dysplasia of the epithelium. The pathogenic mechanisms at the molecular level are completely unclear. In the present study, we first address the expression network and miRNA-lncRNA-mRNA interaction in the malignant transformation process from normal mucosa and atrophic gastritis to a tumor. First, the long non-coding RNA (lncRNA), micro RNA (miRNA) and messenger RNA (mRNA) expression profiles of normal gastric mucosa, atrophic gastritis, gastric cancer and the peri-tumor tissues were analyzed using microarrays. Then, bioinformatic analyses were used to predict the gene targets and analyse their potential roles in tumorigenesis and progression of gastric cancer. Finally, an intersection analysis of microarray data showed that 10 miRNAs and 11 lncRNAs were detected in the malignant transformation process from normal mucosa tissues and atrophic gastritis to tumorigenesis, and many miRNAs and lncRNAs were novel and had important roles. Meanwhile, the significant pathways and biological functions regulated by the deregulated 21 non-coding genes were enriched. In conclusion, our work provides an important theoretical, experimental and clinical foundation for further research on more effective targets for the diagnosis, therapy and prognosis of gastric cancer.

Time-Bin-Encoded Boson Sampling with a Single-Photon Device

Boson sampling is a problem strongly believed to be intractable for classical computers, but can be naturally solved on a specialized photonic quantum simulator. Here, we implement the first time-bin-encoded boson sampling using a highly indistinguishable (∼94%) single-photon source based on a single quantum-dot-micropillar device. The protocol requires only one single-photon source, two detectors, and a loop-based interferometer for an arbitrary number of photons. The single-photon pulse train is time-bin encoded and deterministically injected into an electrically programmable multimode network. The observed three- and four-photon boson sampling rates are 18.8 and 0.2 Hz, respectively, which are more than 100 times faster than previous experiments based on parametric down-conversion.

A new method for measuring the neutron lifetime using an in situ neutron detector

In this paper, we describe a new method for measuring surviving neutrons in neutron lifetime measurements using bottled ultracold neutrons (UCN), which provides better characterization of systematic uncertainties and enables higher precision than previous measurement techniques. An active detector that can be lowered into the trap has been used to measure the neutron distribution as a function of height and measure the influence of marginally trapped UCN on the neutron lifetime measurement. In addition, measurements have demonstrated phase-space evolution and its effect on the lifetime measurement.

Diabetes mitigates the role of memory complaint in predicting dementia risk: Results from the Prevention of Alzheimer's Disease with Vitamin E and Selenium Study

BACKGROUND

Subjective memory complaints (SMCs) are associated with increased risk of dementia in older adults, but the role of comorbidities in modifying this risk is unknown.

OBJECTIVES

To assess whether comorbidities modify estimated dementia risk based on SMCs.

DESIGN

The Prevention of Alzheimer's Disease with Vitamin E and Selenium Study (PREADVISE) was designed as an ancillary study to the Selenium and Vitamin E Cancer Prevention Trial (SELECT), a randomized, multi-center prostate cancer prevention trial with sites in the Unites States, Puerto Rico, and Canada. In 2009, PREADVISE and SELECT were changed into cohort studies.

SETTING

Secondary analysis of PREADVISE data.

PARTICIPANTS

PREADVISE recruited 7,540 non-demented male volunteers from participating SELECT sites from 2002 to 2009. SMCs, demographics, and comorbidities including hypertension, diabetes, coronary artery bypass graft (CABG), stroke, sleep apnea, and head injury were ascertained by participant interview.

MEASUREMENTS

Cox models were used to investigate whether baseline comorbidities modified hazard ratios (HR) for SMC-associated dementia risk using two methods: (1) we included one interaction term between SMC and a comorbidity in the model at a time, and (2) we included all two-way interactions between SMC and covariates of interest and reduced the model by "backward" selection. SMC was operationalized as any complaint vs. no complaint.

RESULTS

Baseline SMCs were common (23.6%). In the first analyses, with the exception of stroke, presence of self-reported comorbidities was associated with lower estimated HR for dementia based on SMC status (complaint vs. no complaint), but this difference was only significant for diabetes. In the second analysis, the two-way interactions between SMC and race as well as SMC and diabetes were significant. Here, black men without diabetes who reported SMC had the highest estimated dementia risk (HR=5.05, 95% CI 2.55-10.00), while non-black men with diabetes who reported SMC had the lowest estimated risk (HR=0.71, 95% CI 0.35-1.41).

CONCLUSIONS

SMCs were more common among men with comorbidities, but these complaints appeared to be less predictive of dementia risk than those originating from men without comorbidities, suggesting that medical conditions such as diabetes may explain SMCs that are unrelated to an underlying neurodegenerative process.

Influence of dietary rapeseed meal levels on growth performance, organ health and standardized ileal amino acid digestibility in meat ducks from 15 to 35 days of age

This study was conducted to investigate the effects of dietary rapeseed meal (RSM) inclusion levels on growth performance, organ health and standardized ileal amino acid digestibility (SIAAD) in meat ducks from 15 to 35 days of age. Six hundred and eighty 15-days-old ducks were randomly allotted to five treatments based on body weight. Five isonitrogenous and isoenergetic diets were formulated on a digestible amino acid basis by replacing 0% (the control), 25%, 50%, 75% and 100% (based on fresh) of protein from soya bean meal (SBM) with protein from RSM. The corresponding levels of RSM in experimental diets were 0%, 6.66%, 13.32%, 19.98% and 26.64% respectively. With increasing dietary RSM levels, body weight (BW) and average daily gain (ADG) linearly decreased (p < 0.001), whereas feed-to-gain ratio (F: G) linearly increased (p = 0.0078). Ducks fed the diets with 13.32% or more RSM had significantly lower (p < 0.05) BW, ADG and ADFI, or higher F: G than ducks fed the control diet. The maximum limit of dietary RSM supplementation was estimated to range from 4.27% to maximize ADG for 15 to 35 days to 11.69% to maintain feed intake for 15 to 35 days on the basis of a broken-line model. At day35, the 4th primary wing feather length and SIAAD (except for Met, Thr and Val) linearly decreased (p < 0.001), and the thyroid glands weight (% of BW) linearly increased (p < 0.05) with increasing dietary RSM levels. Ducks fed the RSM inclusion diets had significantly lower (p < 0.0001) serum aspartate aminotransferase (AST) and alanine transaminase (ALT) activities than ducks fed the control diet. These results suggested that the maximum limit of dietary RSM containing 7.57 μmol/g glucosinolates was estimated to be 4.27% to avoid growth reduction.

The synergistic antiviral effects of GSH in combination with acyclovir against BoHV-1 infection in vitro

We have recently reported that bovine herpesvirus 1 (BoHV-1)-induced overproduction of reactive oxygen species (ROS) partially depends on NADPH oxidases (Noxs). In this study, we found that the decreased levels of main intracellular non-enzymatic antioxidant glutathione (GSH) during BoHV-1 infection also contributed to ROS production. Exogenous GSH administration dramatically inhibited BoHV-1 replication, indicating the critical role of decreased GSH for BoHV-1 replication. Interestingly, GSH synergistically enhanced the antiviral effects of acyclovir (ACV) against BoHV-1 infection in vitro. This study not only illuminates the effect of GSH on BoHV-1 infection but also provides evidence that pharmacological modulation of GSH-mediated ROS production in combination with specific antiviral drugs is a viable therapeutic approach to fighting virus infection.

Outcomes of standard dose EC-MPS with low exposure to CsA in DCD renal transplantation recipients with DGF

AIMS

The lower limit of exposure to cyclosporine A (CsA) has not yet been established in donation after cardiac death (DCD) renal transplantation recipients with delayed graft function (DGF) receiving enteric-coated mycophenolate sodium (EC-MPS) therapy. Stable and adequate mycophenolic acid (MPA) dosing may facilitate lower CsA exposure after DCD renal transplantation in recipients with DGF without compromising safety.

METHODS

A 12-month, single-centre open-label prospective trial was performed in our centre. According to their DGF risk index using the previous DGF prediction models, we divided up the patients on oral CsA into either a DGF group (n = 26) and no DGF group (n = 48). All of the patients initially received the standard EC-MPS dosing (1440 mg/day). The initial dose of CsA in the low risk of DGF group was 4.5 mg/kg/day and in the high risk of DGF group was 2.5 mg/kg/day. Efficacy parameters, safety and tolerability were assessed over a 12-month study period.

RESULTS

The incidence of DGF was 18.5% in the 162 DCD recipients. Between the DGF group and the no DGF group, the 1-year patient survival and graft survival were not significantly different. The incidence of BPAR was higher in the DGF group (26.9% vs. 8.3%, p = 0.032). Most patients in the DGF group had recovery of renal function after 1 month. The adverse events between the two groups were not significantly different. The daily EC-MPS doses of the DGF group were significantly higher than the no DGF group before the 6-month follow-up period. There were no significant differences between the two groups regarding the mean AUC levels during the follow-up period.

CONCLUSIONS

These results show that low expose CsA with standard dosing of EC-MPS and thymoglobulin was efficacious, safe and well-tolerated in DCD renal transplant recipients with DGF in China. Furthermore, stable and adequate MPA exposure helped to reduce the dose of and exposure to CsA. Thus, this may lead to less-induced nephrotoxicity and better renal function recovery.

ERK-mediated NF-κB activation through ASIC1 in response to acidosis

Acidic microenvironment is a common feature of solid tumors. We have previously shown that neuron specific acid-sensing ion channel 1 (ASIC1) is expressed in breast cancer, and it is responsible for acidosis-induced cellular signaling through AKT, leading to nuclear factor-κB (NF-κB) activation, and cell invasion and metastasis. However, AKT is frequently activated in cancer. Thus, a key question is whether ASIC1-mediated cell signaling still takes place in the cancer cells carrying constitutively active AKT. In the present study, we show that among four prostate cancer cell lines tested, 22Rv1 cells express the highest level of phosphorylated AKT that is not impacted by acidosis. However, acidosis can still induce NF-κB activation during which extracellular signal-regulated kinase (ERK) serves as an alternative pathway for ASIC-mediated cell signaling. Inhibition of ERK by chemical inhibitors or small interfering RNAs suppresses the acidosis-induced NF-κB activity through regulation of the inhibitory subunit IκBα phosphorylation. Furthermore, suppression of ASIC1-mediated generation of reactive oxygen species (ROS) by ROS scavengers, such as glutathione or N-acetyl-cysteine causes a decrease in ERK phosphorylation and degradation of IκBα. Finally, ASIC1 is upregulated in a subset of prostate cancer cases and ASIC1 knockout by CRISPR/Cas9 significantly suppresses cell invasion, and castration resistance both in vitro and in vivo. Together, these results support the significance of ASIC1-ROS-ERK-IκBα-NF-κB axis in prostate tumorigenesis, especially in the constitutively active AKT background.

[Assessment of the validity and utility of the Beijing questionnaire as atool to evaluate for obstructive sleep apnea hypopnea syndrome]

Objective:To test the Beijing questionnaire as a means of identifying patients with obstructive sleep apnea hypopnea syndrome（OSAHS）.Method: The Beijing questionnaire is designed as an explorative tool consist of 11 questions for patients with obstructive sleep apnea hypopnea, and is targeted toward key symptoms include snoring, apneas, daytime sleepiness, hypertension and overweight. 1 336 female participants living in communities of age≥40 years and 198 male adult subjects visting clinics were given questionnaires. Finally, 59 female and 198 male subjects underwent sleep studies after factor analysis,reliability check,internal consistency study. The correlation analysis was performed between the scores from the Beijing questionnaire and the apnea-hypopnea index from inlaboratory polysomnography.Receiver operating characteristics were constructed to determine optimal sensitivity and specificity. Twenty-four male subjects were recorded in the sleep laberatory again after operative.Result: Factor analysis reduced 11 questions of scale to four common factors as we have designed: snoring,apneas,other symptoms,risk factors. Cronbach's α coefficient of scale reached 0.7.There were an acceptable level of testretest reliability(r=0.619,P<0.01).The apnea hypopnea indices were significantly correlated with their Beijing questionnaire scores(P<0.01).For wemen,an Beijing questionnaire scroe of 19.5 provided a sensitivity of 74.3% and a specificity of 62.5%.For men,an Beijing questionnaire scroe of 22.5 provided a sensitivity of 90.9% and a specificity of 54.5%. And the postoperative Beijing questionnaire scroes changed with the apnea hypopnea indices.Conclusion:This questionnaire has a good validity and reliability and appears to be valid and sensitive to clinical change.

[Effect of three kinds of modelling of mandible on the finite element analysis of implant]

Objective: To investigate the effect of three types of material homogeneities(isotropy, transverse isotropy, and orthotropy) of mandible on the finite element analysis of implant. Methods: Three-dimensional model of complete mandible containing an implant was constructed and analyzed with isotropic, transversely isotropic, and orthotropic models, respectively. Results: The effective stress, tensile stress, and compressive stress of cortical bone of the orthogonal model were 1.2, 1.2, and 1.1 times larger than that of the isotropic model. The effective stress, tensile stress, and compressive stress of cancellous bone of the orthogonal model were 1.6, 2.6, and 3.3 times larger than that of the isotropic model. The effective strain, tensile strain, and compressive strain of cortical bone of the transversely isotropic model were 1.1, 1.0, and 1.1 times larger than that of the isotropic model. The effective strain, tensile strain, and compressive strain of cortical bone of the orthogonal model were 2.2, 1.8, and 1.7 times larger than that of the isotropic model. The stress and strain of cancellous bone increased when the material homogeneity changed from isotropy to transverse isotropy and to orthotropy. Moreover, in term of stress and strain distribution, the orthotropic modelling of mandible was most uniform followed by the transverse isotropy and the isotropy. Conclusions: In the finite element analysis of implant system, the orthotropic property of the mandible can not be neglected.

What determines the interfacial configuration of Nb/Al2O3 and Nb/MgO interface

Nb films are deposited on single crystal Al₂O₃ (110) and MgO(111) substrates by e-beam evaporation technique. Structure of Nb films and orientation relationships (ORs) of Nb/Al₂O₃ and Nb/MgO interface are studied and compared by the combination of experiments and simulations. The experiments show that the Nb films obtain strong (110) texture, and the Nb film on Al₂O₃(110) substrate shows a higher crystalline quality than that on MgO(111) substrate. First principle calculations show that both the lattice mismatch and the strength of interface bonding play major roles in determining the crystalline perfection of Nb films and ORs between Nb films and single crystal ceramic substrates. The fundamental mechanisms for forming the interfacial configuration in terms of the lattice mismatch and the strength of interface bonding are discussed.

[Influence of trabecular microstructure modeling on finite element analysis of dental implant]

OBJECTIVE

To analyze the influence of trabecular microstructure modeling on the biomechanical distribution of implant-bone interface with a three-dimensional finite element mandible model of trabecular structure.

METHODS

Dental implants were embeded in the mandibles of a beagle dog. After three months of the implant installation, the mandibles with dental implants were harvested and scaned by micro-CT and cone-beam CT. Two three-dimensional finite element mandible models, trabecular microstructure(precise model) and macrostructure(simplified model), were built. The values of stress and strain of implant-bone interface were calculated using the software of Ansys 14.0.

RESULTS

Compared with the simplified model, the precise models' average values of the implant bone interface stress increased obviously and its maximum values did not change greatly. The maximum values of quivalent stress of the precise models were 80% and 110% of the simplified model and the average values were 170% and 290% of simplified model. The maximum and average values of equivalent strain of precise models were obviously decreased, and the maximum values of the equivalent effect strain were 17% and 26% of simplified model and the average ones were 21% and 16% of simplified model respectively. Stress and strain concentrations at implant-bone interface were obvious in the simplified model. However, the distributions of stress and strain were uniform in the precise model.

CONCLUSIONS

The precise model has significant effect on the distribution of stress and strain at implant-bone interface.

Molecular cloning, overexpression, purification, and sequence analysis of the giant panda (Ailuropoda melanoleuca) ferritin light polypeptide

The complementary DNA (cDNA) of the giant panda (Ailuropoda melanoleuca) ferritin light polypeptide (FTL) gene was successfully cloned using reverse transcription-polymerase chain reaction technology. We constructed a recombinant expression vector containing FTL cDNA and overexpressed it in Escherichia coli using pET28a plasmids. The expressed protein was then purified by nickel chelate affinity chromatography. The cloned cDNA fragment was 580 bp long and contained an open reading frame of 525 bp. The deduced protein sequence was composed of 175 amino acids and had an estimated molecular weight of 19.90 kDa, with an isoelectric point of 5.53. Topology prediction revealed one N-glycosylation site, two casein kinase II phosphorylation sites, one N-myristoylation site, two protein kinase C phosphorylation sites, and one cell attachment sequence. Alignment indicated that the nucleotide and deduced amino acid sequences are highly conserved across several mammals, including Homo sapiens, Cavia porcellus, Equus caballus, and Felis catus, among others. The FTL gene was readily expressed in E. coli, which gave rise to the accumulation of a polypeptide of the expected size (25.50 kDa, including an N-terminal polyhistidine tag).

Estimating the Dimension of an Inertial Manifold from Unstable Periodic Orbits

We provide numerical evidence that a finite-dimensional inertial manifold on which the dynamics of a chaotic dissipative dynamical system lives can be constructed solely from the knowledge of a set of unstable periodic orbits. In particular, we determine the dimension of the inertial manifold for the Kuramoto-Sivashinsky system and find it to be equal to the "physical dimension" computed previously via the hyperbolicity properties of covariant Lyapunov vectors.

Near-Transform-Limited Single Photons from an Efficient Solid-State Quantum Emitter

By pulsed s-shell resonant excitation of a single quantum dot-micropillar system, we generate long streams of 1000 near-transform-limited single photons with high mutual indistinguishability. The Hong-Ou-Mandel interference of two photons is measured as a function of their emission time separation varying from 13 ns to 14.7  μs, where the visibility slightly drops from 95.9(2)% to a plateau of 92.1(5)% through a slow dephasing process occurring at a time scale of 0.7  μs. A temporal and spectral analysis reveals the pulsed resonance fluorescence single photons are close to the transform limit, which are readily useful for multiphoton entanglement and interferometry experiments.

Evaluation of the GenoType(®) MTBDRplus line probe assay on sputum-positive samples in routine settings in China

BACKGROUND

Rapid molecular methods have been recommended for early detection of drug-resistant tuberculosis (TB).

OBJECTIVE

To evaluate the performance of the GenoType(®) MTBDRplus assay in routine settings in China.

METHODS

Sputum-positive samples were collected consecutively from 1 April to 31 December 2010. MTBDRplus results were compared to those of conventional drug susceptibility testing (DST). The McNemar χ(2) test and κ coefficient were used to assess performance.

RESULTS

Of 427 smear-positive sputum samples collected, conventional DST and MTBDTplus confirmed drug resistance in 326. The sensitivities and specificities for MTBDRplus in detecting isoniazid (INH) and rifampicin (RMP) resistance were respectively 76.47%, 95.44%, 85.94% and 93.13%. The McNemar χ(2) test indicated no significant difference between the two methods (P = 0.106 for INH and P = 0.083 for RMP). The κ values for INH, RMP and multidrug resistance were respectively 0.75, 0.75 and 0.70.

CONCLUSIONS

Although the MTBDRplus assay was moderately concordant with conventional DST in detecting INH and RMP resistance, as a prospective rapid molecular method for MDR-TB detection, potential resistant mutations need to be incorporated to improve the accuracy of detection.

Enhancing immune responses of EV71 VP1 DNA vaccine by co-inoculating plasmid IL-12 or GM-CSF expressing vector in mice

Enterovirus 71 (EV71) is a major causative viral agent for large outbreaks of hand, foot, and mouth disease in children and infants, yet there is no vaccine or effective antiviral treatment for severe EV71 infection. The immunogenicity of EV71 VP1 DNA vaccine and the immunoregulatory activity of interleukin-12 (IL-12) or granulocyte-monocyte colony stimulating factor (GM-CSF) were investigated. DNA vaccine plasmids, pcDNA-VP1, pcDNA-IL-12 and pcDNA-GM-CSF were constructed and inoculated into BALB/c mice with or without pcDNA-IL-12 or pcDNA-GM-CSF by intramuscular injection. Cellular and humoral immune responses were assessed by indirect ELISA, lymphocyte proliferation assays, cytokine release assay and FACS. The VP1 DNA vaccine had good immunogenicity and can induce specific humoral and cellular immunity in BALB/c mice, while IL-2 or GM-CSF plays an immunoadjuvant role and enhances specific immune responses. This study provides a frame of reference for the design of DNA vaccines against EV71.

Validation and determination of taselisib, a β-sparing phosphoinositide 3-kinase (PI3K) inhibitor, in human plasma by LC-MS/MS

A liquid chromatographic-tandem mass spectrometry (LC-MS/MS) method for the determination of taselisib (GDC-0032, RO5537381) concentrations in human plasma has been developed and validated to support bioanalysis of clinical samples. Solid phase extraction (SPE) was used to extract plasma samples (50μL) and the resulting samples were analyzed using reversed phase chromatography and mass spectrometry coupled with an atmospheric pressure chemical ionization interface. The mass analysis of taselisib was performed using multiple reaction monitoring transitions in positive ionization mode. The method was validated over the calibration curve range 0.400-400ng/mL using linear regression and 1/x(2) weighting. The within-run relative standard deviation (%RSD) ranged from 1.3 to 5.6%, while the between-run %RSD varied from 2.0 to 4.5% for LLOQ, low, medium, medium high and high QCs. The accuracy ranged from 94.7 to 100.3% of nominal for within-run and 96.0-99.0% of nominal for between-run for the same QCs. Extraction recovery of taselisib was between 83.8% and 92.9%. Stability of taselisib was established in human plasma for 977days at -20°C and -70°C and established in sample extracts for 96h when stored at 2 - 8°C. Stable-labeled internal standard was used to minimize matrix effects. Mean single dose pharmacokinetic parameters determined using this method for a phase I/II clinical trial were: Cmax=35.2ng/mL, AUC0-inf=1570ngh/mL, and T1/2=39.3h.

Numb induces e-cadherin adhesion dissolution, cytoskeleton reorganization, and migration in tubular epithelial cells contributing to renal fibrosis

Numb, an endocytic protein, is involved in both neural differentiation and protein post-endocytic trafficking. Although negative Numb expression has been linked to human mammary carcinomas, little is known about its expression and functions in other diseases. In the present study, we observed that Numb is expressed in renal tubule epithelia and its expression is increased in the fibrotic kidney in vivo. We determined that in proximal tubular epithelial cells (NRK52E cells), TGF-β1 induces the expression of Numb and ectopic expression of Numb leads to dissolution of E-cadherin adhesion, reorganization of cytoskeleton, activation of Rac1 and Cdc42, and enhancement of migration. Either knockdown of α-adaptin or overexpression of Numb asparagine-proline-phenylalanine (NPF) mutant interferes with AP-2 dependent endocytosis and rescues Ecadherin level in NRK52E cells. Moreover, knockdown of integrin β1 or α-adaptin, and overexpression of a Numb dominant-negative form (Numb phosphotyrosine binding [PTB] domain) impair integrin endocytosis, and markedly inhibit Numb-induced cell migration and activation of Rac1 and Cdc42. Taken together, our work identifies Numb as an important player in renal fibrosis, by regulating epithelial-to-mesenchymal transition (EMT) process including E-cadherin adhesion dissolution, actin reorganization, and migration enhancement in NRK52E cells.

Low nanomolar concentrations of Cucurbitacin-I induces G2/M phase arrest and apoptosis by perturbing redox homeostasis in gastric cancer cells in vitro and in vivo

Cucurbitacin-I (Cu-I, also known as Elatericin B or JSI-124) is developed to inhibit constitutive and abnormal activation of STAT3 in many cancers, demonstrating a potent anticancer activity by targeting disruption of STAT3 function. Here, we for the first time systematically studied the underlying molecular mechanisms of Cu-I-induced gastric cancer cell death both in vitro and in vivo. In our study, we show that Cu-I markedly inhibits gastric cancer cell growth by inducing G2/M phase cell cycle arrest and apoptosis at low nanomolar concentrations via a STAT3-independent mechanism. Notably, Cu-I significantly decreases intracellular GSH/GSSG ratio by inhibiting NRF2 pathway to break cellular redox homeostasis, and subsequently induces the expression of GADD45α in a p53-independent manner, and activates JNK/p38 MAPK signaling. Interestingly, Cu-I-induced GADD45α and JNK/p38 MAPK signaling form a positive feedback loop and can be reciprocally regulated by each other. Therefore, the present study provides new insights into the mechanisms of antitumor effects of Cu-I, supporting Cu-I as an attractive therapeutic drug in gastric cancer by modulating the redox balance.

Abstract P3-07-60: Impact of high SPARC expression of a primary tumor as a strong risk factor for disease recurrence and overall survival in patients with triple-negative breast cancer

Background: SPARC (secreted protein acidic and rich in cystein) is a secreted glycoprotein that interacts with extracellular matrix protein and acts as a regulator of critical cellular functions such as proliferation and cell migration. An increasing number of studies have shown altered expression of SPARC in several malignancies. However, the role of this potential biomarker in breast cancer development and progression is controversial. Triple-negative breast cancer (TNBC) is known for its poor prognosis and high recurrence probability. There is a need for prognostic biomarkers to guide treatment decisions for this subtype.

Objective: To explore the association between SPARC and the prognosis of triple-negative breast cancer.

Methods: In this study, a total of 211 samples of triple-negative breast lesions from 2004 to 2008 were collected in Cancer Hospital, Chinese Academy of Medical Sciences. SPARC expression was evaluated by immunohistochemistry using an immunoreactive score (IRS) from patients with up to 10 years clinical follow-up data. The current study set out to examine both the expression of SPARC in primary tumor tissue and to demonstrate if a link existed between the levels of SPARC and the clinical outcome. Cox proportional hazards model was used to estimate HRs and 95%CI, stratified on tumor grade, TNM stage, lymph node status and vascular invasion.

Results: High SPARC expression (IRS≥3) was observed in 52.1% of all primary tumors. Patients expressing low levels of SPARC had better disease-free survival (DFS) (HR=0.632, 95%CI:0.405-0.987, P = 0.044) as well as overall survival(OS)(HR=0.576, 95%CI:0.351-0.946, P = 0.029) compared to those with high SPARC expression levels.Furthermore, the presence of high SPARC expression was an independent prognostic factor for both DFS (HR=1.67, 95%CI:1.04-2.69, P=0.034) and OS(HR=1.77, 95%CI:1.04-3.01, P=0.037) of triple-negative breast cancer patients, stratified on tumor grade, TNM stage, lymph node metastasis and vascular invasion, with adjustment for age, hormonal status, tumor size, adjuvant radiotherapy and adjuvant chemotherapy.

Conclusion: Our results suggest that the presence of higher SPARC expression could be an indicator of high aggressiveness and may be a strong prognostic factor for triple-negative breast cancer.

Citation Format: Zhu A, Yuan P, Du F, Ding X, Xu B. Impact of high SPARC expression of a primary tumor as a strong risk factor for disease recurrence and overall survival in patients with triple-negative breast cancer. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P3-07-60.

A trinuclear ruthenium complex as a highly efficient molecular catalyst for water oxidation

A trinuclear catalyst, 3, was synthesized based on Ru(bda) (bda = 2,2′-bipyridine-6,6′-dicarboxylic acid)-type catalysts to achieve higher catalytic abilities in homogeneous water oxidation systems.

Regulation of ATRIP protein abundance by RAD9 in the DNA damage repair pathway

Genotoxic stress activates checkpoint signaling pathways that activate the checkpoint kinases ATM and ATR, halt cell cycle progression, and promote DNA repair. A number of proteins act in concert with ATR to phosphorylate Chk1, including RAD17, the RAD9-RAD1-HUS1 complex, ATR/ATRIP and TopBp1. However, how these proteins involved act in concert with one another to propagate and maintain the checkpoint response is not well understood. Here, we reported that upregulation of RAD9 protein increased the quantity of ATRIP, suggesting that RAD9 activation will induce more efficient accumulation of ATRIP in vivo. Furthermore, the DNA damage-induced ATRIP foci formation was faster in the mRad9-/- ES cells. Also, ATRIP interacts specifically with RAD9, but not HUS1 and RAD1. Taken together, we suggested that RAD9 could affect both the ATRIP protein levels and DNA damage-induced ATRIP foci formation. Thus, we propose a role of RAD9 in the ATR-Chk1 pathway that is necessary for successful formation of the damage-sensing complex and DNA damage checkpoint signaling.

Curcumin inhibits bovine herpesvirus type 1 entry into MDBK cells

The generation of antiviral drugs from herbs and other natural resources with traditionally long-confirmed effects is an efficient approach. So far, no herb or components from herbs that could inhibit bovine herpesvirus type 1 (BoHV-1) replication have been described. In this study, the antiviral effect of curcumin, a natural phenolic constituent of the spice turmeric, on BoHV-1 replication was evaluated in cell culture. We demonstrated that curcumin impairs BoHV-1 viral particles and affects the virus post-binding entry process. Furthermore, curcumin upregulated the proportion of the plasma membrane adopting a lipid raft conformation in MDBK cells, which supported the previous reports that curcumin can modulate the lipid bilayer. Though the antiviral mechanism of curcumin on BoHV-1 needs further study, we identified for the first time a component from herb that could inhibit BoHV-1 replication, in vitro.

High risk factors of atrial fibrillation in type 2 diabetes: results from the Chinese Kailuan study

BACKGROUND

The pathophysiological mechanisms for atrial fibrillation (AF) vulnerability in diabetic patients are largely unclear.

AIM

To investigate the high risk factors of AF in Chinese Kailuan diabetes.

DESIGN

A retrospective review of AF in Chinese Kailuan diabetes.

METHODS

Research and statistic analysis on the clinical data of 9050 diabetic patients from Kailuan Coal Mine Group Corporation who participated in a health survey from July 2006 to October 2007.

RESULTS

Sixty diabetic patients (50 males and 10 females) were diagnosed with AF during the health checkup, with a prevalence of 0.66% (0.67% in males and 0.62% in females). Univariate analysis showed that patients with AF were older and had higher levels of serum uric acid (UA), pulse pressure, serum c-reactive protein and anti-hypertensive medication usage, but lower levels of fasting blood glucose and triglycerides (TG). Multivariate analysis indicated that older age (OR = 1.09; 95% CI: 1.06-1.12), increased UA (OR = 1.01; 95% CI: 1.00-1.01) and decreased TG (OR = 0.71; 95% CI: 0.55-0.92) were independent predictive factors of AF after adjusting for other variables. After gender stratification, age and UA remained as independent predictive factors of AF in both male and female patients. However, TG had an independent inverse association with AF in male patients only.

CONCLUSIONS

Age and UA are independent predictive factors of AF in both male and female diabetic patients. TG is inversely correlated with AF in male diabetic patients only.