Sun Y.,Beijing Hospital of the Ministry of Health |
Wang M.,Chinese Academy of Sciences |
Lin G.,Beijing Hospital of the Ministry of Health |
Lin G.,Peking Union Medical College |
And 4 more authors.
PLoS ONE | Year: 2012
Background: One major impediment to improving the management of breast cancer is the current lack of tumor marker with sufficient sensitivity and specificity. A growing body of evidence implicates the diagnostic potential of circulating miRNAs in cancer detection. MiR-155 plays an important role in the pathogenesis of breast cancer. However, the level of circulating miR-155 and its clinical relevance are not well established. The objective of the current study was to learn more about serum miR-155 in patients with breast cancer. Methodology/Principal Findings: Using quantitative reverse transcription polymerase chain reaction (RT-qPCR), we demonstrated that serum miR-155 had significant increased levels in breast cancer patients (n = 103) compared with healthy subjects (n = 55) (p<0.001), which had a mean fold change of 2.94. Receiver operating characteristic (ROC) analysis revealed that miR-155 had considerable diagnostic accuracy, yielding an ROC-AUC (the areas under the ROC curve) of 0.801 (sensitivity 65.0%, specificity 81.8%). In addition, sera from a subset of breast cancer patients (n = 29) were collected after surgery and after four cycles of chemotherapy to evaluate the effects of clinical treatment on serum levels of candidate miRNAs. Surprisingly, a decreased level of serum miR-155 was found; whereas the concentrations of carbohydrate antigen 15-3 (CA15-3), carcinoembryonic antigen (CEA) and tissue polypeptide specific antigen (TPS) did not show this trend. Our results revealed that 79% patients showed response or stable disease after therapy had declined levels of serum miR-155. Conclusions/Significance: Our results suggest that serum miR-155 is a potential biomarker to discriminate breast cancer patients from healthy subjects. For the first time, we demonstrated a declined trend of miR-155 after surgery and chemotherapy, which raises the possibility to use it as an indicator for treatment response. © 2012 Sun et al.
Hong P.,Beijing Hospital of the Ministry of Health |
Hong P.,Peking Union Medical College |
Li J.,Beijing Hospital of the Ministry of Health |
Li J.,Peking Union Medical College
Virus Research | Year: 2012
Since the discovery of xenotropic murine leukemia virus-related virus (XMRV) in 2006, one of the most controversial topics is whether it contributes to the pathogenesis of prostate cancer (PCa) and/or chronic fatigue syndrome (CFS). The debate began with the failure to detect XMRV in clinical PCa samples. Concerns about the potential health risk of XMRV exposure were reinforced by a study demonstrating the presence of XMRV in patients with CFS. However, serious concerns on whether XMRV plays a role in the development of PCa and/or CFS have been raised. However, inconsistent reports linking XMRV with PCa and/or CFS have led to conflicting views about the potential of XMRV as a human pathogen. Several recent studies suggest that contamination could account for the positive correlations between XMRV and PCa and/or CFS to date. At present, evidence does not indicate that XMRV plays any role in the pathogenesis of PCa or CFS. © 2012 Elsevier B.V.
Yao Y.,Peking Union Medical College |
Li J.,Beijing Hospital of the Ministry of Health |
Wang L.,Beijing Hospital of the Ministry of Health
International Journal of Molecular Sciences | Year: 2014
In the human genome, the fraction of protein-coding genes that are stably transcribed is only up to 2%, with the remaining numerous RNAs having no protein-coding function. These non-coding RNAs (ncRNAs) have received considerable attention in cancer research in recent years. Breakthroughs have been made in understanding microRNAs and small interfering RNAs, but larger RNAs such as long ncRNAs (lncRNAs) remain an enigma. One lncRNA, HOX antisense intergenic RNA (HOTAIR), has been shown to be dysregulated in many types of cancer, including breast cancer, colorectal cancer, and hepatoma. HOTAIR functions as a regulatory molecule in a wide variety of biological processes. However, its mechanism of action has not been clearly elucidated. It is widely believed that HOTAIR mediates chromosomal remodeling and coordinates with polycomb repressive complex 2 (PRC2) to regulate gene expression. Further study of HOTAIR-related pathways and the role of HOTAIR in tumorigenesis and tumor progression may identify new treatment targets. In this review, we will focus on the characteristics of HOTAIR, as well as data pertaining to its mechanism and its association with cancers. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
Li M.,Peking Union Medical College |
Li M.,Beijing Hospital of the Ministry of Health |
Kang R.,Peking Union Medical College |
Shi J.,Peking Union Medical College |
And 2 more authors.
PLoS ONE | Year: 2013
Epilepsy is a chronic neurological disorder characterized by recurrent seizures. However, approximately one-third of epilepsy patients still suffer from uncontrolled seizures. Effective treatments for epilepsy are yet to be developed. N6-(3-methoxyl-4-hydroxybenzyl) adenine riboside (B2) is a N6-substitued adenosine analog. Here we describe an investigation of the effects and mechanisms of B2 on chemical convulsant-induced seizures. Seizures were induced in mice by administration of 4-aminopyridine (4-AP), pentylenetetrazol (PTZ), picrotoxin, kainite acid (KA), or strychnine. B2 has a dose-related anticonvulsant effect in these chemical-induced seizure models. The protective effects of B2 include increased latency of seizure onset, decreased seizure occurrence, shorter seizure duration and reduced mortality rate. Radioligand binding and cAMP accumulation assays indicated that B2 might be a functional ligand for both adenosine A1 and A2A receptors. Furthermore, DPCPX, a selective A1 receptor antagonist, but not SCH58261, a selective A2A receptor antagonist, blocked the anticonvulsant effect of B2 on PTZ-induced seizure. c-Fos is a cellular marker for neuronal activity. Immunohistochemical and western blot analyses indicated that B2 significantly reversed PTZ-induced c-Fos expression in the hippocampus. Together, these results indicate that B2 has significant anticonvulsant effects. The anticonvulsant effects of B2 may be attributed to adenosine A1 receptor activation and reduced neuronal excitability in the hippocampus. These observations also support that the use of adenosine receptor agonist may be a promising approach for the treatment of epilepsy. © 2013 Li et al.
Tsang M.-K.,Hong Kong Polytechnic University |
Ye W.,Hong Kong Polytechnic University |
Ye W.,Zhejiang University of Technology |
Wang G.,Beijing Hospital of the Ministry of Health |
And 3 more authors.
ACS Nano | Year: 2016
Ebola outbreaks are currently of great concern, and therefore, development of effective diagnosis methods is urgently needed. The key for lethal virus detection is high sensitivity, since early-stage detection of virus may increase the probability of survival. Here, we propose a luminescence scheme of assay consisting of BaGdF5:Yb/Er upconversion nanoparticles (UCNPs) conjugated with oligonucleotide probe and gold nanoparticles (AuNPs) linked with target Ebola virus oligonucleotide. As a proof of concept, a homogeneous assay was fabricated and tested, yielding a detection limit at picomolar level. The luminescence resonance energy transfer is ascribed to the spectral overlapping of upconversion luminescence and the absorption characteristics of AuNPs. Moreover, we anchored the UCNPs and AuNPs on a nanoporous alumina (NAAO) membrane to form a heterogeneous assay. Importantly, the detection limit was greatly improved, exhibiting a remarkable value at the femtomolar level. The enhancement is attributed to the increased light-matter interaction throughout the nanopore walls of the NAAO membrane. The specificity test suggested that the nanoprobes were specific to Ebola virus oligonucleotides. The strategy combining UCNPs, AuNPs, and NAAO membrane provides new insight into low-cost, rapid, and ultrasensitive detection of different diseases. Furthermore, we explored the feasibility of clinical application by using inactivated Ebola virus samples. The detection results showed great potential of our heterogeneous design for practical application. © 2015 American Chemical Society.
Wang L.,CAS Institute of Biophysics |
Wu J.,Salk Institute for Biological Studies |
Fang W.,Beijing Hospital of the Ministry of Health |
Liu G.-H.,CAS Institute of Biophysics |
And 3 more authors.
Cell Research | Year: 2015
The CRISPR/Cas system has proven to be a powerful gene editing tool both in vitro and in vivo. A recent flurry of studies of in vivo gene editing using the CRISPR/Cas system bring bright prospects in creating animal models and targeted gene therapy of human genetic diseases. © 2015 IBCB, SIBS, CAS All rights reserved.
Zeng R.,Beijing Hospital of the Ministry of Health |
Wang W.,Beijing Hospital of the Ministry of Health |
Wang Z.,Beijing Hospital of the Ministry of Health
Clinical Chemistry and Laboratory Medicine | Year: 2013
Background: A national cross-sectional survey on the reporting of critical values was conducted to provide suggestions on monitoring of the quality indicator and obtain the goal of quality improvement. Methods: All clinical laboratories participating in the external quality assessment (EQA) programs of chemistry, blood gas, and hematology tests organized by the National Center for Clinical Laboratories (NCCL) were enrolled in our study. General information on the policy of critical values reporting and the particular problems about critical limits and practice of critical values reporting in the last 2 months were asked in the questionnaire. All collected data were analyzed by the special statistical software designed by the NCCL. Results: The return rate of surveys for critical values on clinical biochemistry, blood gas, and hematology testing were 46.11%, 41.14%, and 39.42%, respectively. Most laboratories in the surveys suggested they set different critical limits for children and adults. The analytes of critical values chosen most frequently were potassium, glucose, sodium, calcium, pH, pCO2, pO2, white blood cell (WBC) count, hemoglobin (Hb), prothrombin time (PT), activated partial thromboplastin time, and fibrinogen. The analytes with most critical values were potassium, blood gas, and creatinine for clinical biochemistry, pCO2 for blood gas, and WBC, Hb, and PT for hematology testing. The medians of critical limits for potassium, sodium, calcium, and glucose were not significantly different from the results of the national survey conducted by Kost in 1990. Conclusions: Remarkable inter-laboratory difference in the development and implementation of critical values reporting procedure were found. Laboratories should communicate with clinicians to obtain consensus on the analytes and limits of critical values. © 2013 by Walter de Gruyter Berlin Boston.
Chang J.-M.,Beijing Hospital of the Ministry of Health |
Gao X.-M.,Beijing Hospital of the Ministry of Health
Chinese Medical Journal | Year: 2013
Background The clinical and histopathological characteristics of basal cell carcinoma (BCC) have been relatively well studied in Caucasian population. To characterize BCC in Chinese population, we analyzed the association of the histopathological subtypes with gender, age and anatomical location in this study. Methods The clinical and histopathological data of 243 BCC cases diagnosed at three hospitals in Beijing from January 2000 to April 2009 were reviewed retrospectively. Gender, age, location and histopathological subtype were analyzed. Results Among 243 patients enrolled, 118 were males and 125 were females. The male/female ratio was 0.94:1. The mean age was (65.16±12.62) years old. The head and neck were the most common sites of BCC (77.4%). Of the BCCs, 53.9% were nodular, 18.9% superficial and 18.5% infiltrative-morphoeic. The nodular, infiltrative-morphoeic and micronodular subtypes were predominant located on the head and neck, whereas the trunk was the most common location for the superficial subtype (P<0.05). The age at first presentation for females was lower than that for males (P<0.05). The age at first presentation for the superficial BCCs was younger than the non-superficial subtypes (P<0.05). Women with superficial BCC subtype visited hospital earlier than men (P<0.05). Conclusions Consistent with previous reports in Caucasian patient, our study find that different histopathological subtypes of BCC has distinct clinical features. It is speculated that the mechanisms underlining the pathogenesis of the superficial BCC may be different than those of non-superficial subtypes of BCC.
Rapid determination of thiamine, riboflavin, niacinamide, pantothenic acid, pyridoxine, folic acid and ascorbic acid in Vitamins with Minerals Tablets by high-performance liquid chromatography with diode array detector
Jin P.,Beijing Hospital of the Ministry of Health |
Xia L.,Beijing Hospital of the Ministry of Health |
Li Z.,Beijing Hospital of the Ministry of Health |
Che N.,Beijing Hospital of the Ministry of Health |
And 2 more authors.
Journal of Pharmaceutical and Biomedical Analysis | Year: 2012
A simple, isocratic, and stability-indicating high-performance liquid chromatography (HPLC) method has been developed for the rapid determination of thiamine (VB1), niacinamide (VB3), pyridoxine (VB6), ascorbic acid (VC), pantothenic acid (VB5), riboflavin (VB2) and folic acid (VB9) in Vitamins with Minerals Tablets (VMT). An Alltima C18 column (250mm×4.6mm i.d., 5μm) was used for the separation at ambient temperature, with 50mM ammonium dihydrogen phosphate (adjusting with phosphoric acid to pH 3.0) and acetonitrile as the mobile phase at the flow rate of 0.5mlmin-1. VB1, VB3, VB6, VC and VB5 were extracted with a solution containing 0.05% phosphoric acid (v/v) and 0.3% sodium thiosulfate (w/v), and were then simultaneously analyzed by using the mobile phase of phosphate buffer-acetonitrile (95:5, v/v), while VB2 and VB9 were extracted with a solution containing 0.5% ammonium hydroxide solution (v/v), and were then simultaneously analyzed by using the mobile phase of phosphate buffer-acetonitrile (85:15, v/v). The detection wavelengths were 275nm for VB1, VB3, VB6, VC, 210nm for VB5, and 282nm for VB2 and VB9. The method showed good system suitability, sensitivity, linearity, specificity, precision, stability and accuracy. All the seven water-soluble vitamins were well separated from other ingredients and degradation products. Method comparison indicated good concordance between the developed method and the USP method. The developed method was reliable and convenient for the rapid determination of VB1, VB3, VB6, VC, VB5, VB2 and VB9 in VMT. © 2012 Elsevier B.V.
Gu X.,Beijing Hospital of the Ministry of Health |
Yu X.,Beijing Hospital of the Ministry of Health |
Dai H.,Beijing Hospital of the Ministry of Health
Current Eye Research | Year: 2014
Aims: To evaluate potential adverse ranibizumab-related systemic events through analysis of variations in serum levels of vascular endothelial growth factor (VEGF) in neovascular age-related macular degeneration (AMD) patients before and after a single intravitreal injection of ranibizumab. Methods: Thirty-nine patients with neovascular AMD and 39 healthy control subjects were enrolled in the study. Patients received a single intravitreal injection of ranibizumab (0.5 mg) in one eye. Venous blood was collected and placed in coagulation-promoting tubes 1 day before and on post-injection days 1, 3, 7 and 30. Serum concentrations of VEGF were measured by ELISA at each time point. Results: VEGF concentrations were 323.64 pg/ml in AMD patients and 392.94 pg/ml in control subjects before injection (p > 0.05). VEGF significantly decreased to 304.65 pg/ml 1 day later (p < 0.05) in AMD patients, then increased to 310.77 (p > 0.05), 317.89 (p > 0.05) and 311.79 pg/ml (p > 0.05) on post-injection days 3, 7 and 30, respectively. Conclusion: No significant changes in serum levels of VEGF were found from 3 to 30 days following a single intravitreal ranibizumab injection. Although certain influences existed 24-h post-injection, effect(s) of a single intravitreal ranibizumab injection on the homeostasis of the cardiovascular system during such a brief period is unknown. © Informa Healthcare USA, Inc.