Time filter

Source Type

He J.,East China Normal University | He J.,Zhejiang University | Zhu J.,Shanghai Integrated Circuit Research and Development Center | Gong C.,East China Normal University | And 4 more authors.
PLoS ONE | Year: 2015

Background The diagnostic and prognostic value of microRNAs (miRNAs) in a variety of diseases is promising. The novel silicon nanowire (SiNW) biosensors have advantages in molecular detection because of their high sensitivity and fast response. In this study, poly-crystalline silicon nanowire field-effect transistor (poly-SiNWFET) device was developed to achieve specific and ultrasensitive detection of miRNAs without labeling and amplification. Methods The poly-SiNW FET was fabricated by a top-down Complementary Metal Oxide Semiconductor (CMOS) wafer fabrication based technique. Single strand DNA (ssDNA) probe was bind to the surface of the poly-SiNW device which was silanated and aldehyde-modified. By comparing the difference of resistance value before and after ssDNA and miRNA hybridization, poly-SiNW device can be used to detect standard and real miRNA samples. Results Poly-SiNW device with different structures (different line width and different pitch) was applied to detect standard Let-7b sample with a detection limitation of 1 fM. One-base mismatched sequence could be distinguished meanwhile. Furthermore, these poly-SiNW arrays can detect snRNA U6 in total RNA samples extracted from HepG2 cells with a detection limitation of 0.2 μg/mL. In general, structures with pitch showed better results than those without pitch in detection of both Let-7b and snRNA U6. Moreover, structures with smaller pitch showed better detection efficacy. Conclusion Our findings suggest that poly-SiNW arrays could detect standard and real miRNA sample without labeling or amplification. Poly-SiNW biosensor device is promising for miRNA detection. © 2015 He et al..This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Source

Xiang Y.,U.S. National Institutes of Health | Xiang Y.,Wuhan Medical and Health Center for Women and Children | Shen J.,U.S. National Institutes of Health
Journal of Magnetic Resonance | Year: 2012

In vivo detection of carboxylic/amide carbons is a promising technique for studying cerebral metabolism and neurotransmission due to the very low RF power required for proton decoupling. In the carboxylic/amide region, however, there is severe spectral overlap between acetate C1 and glutamate C5, complicating studies that use acetate as an astroglia-specific substrate. There are no known in vivo MRS techniques that can spectrally resolve acetate C1 and glutamate C5 singlets. In this study, we propose to spectrally separate acetate C1 and glutamate C5 by a two-step J-editing technique after introducing homonuclear 13C- 13C scalar coupling between carboxylic/amide carbons and aliphatic carbons. By infusing [1,2- 13C 2]acetate instead of [1- 13C]acetate the acetate doublet can be spectrally edited because of the large separation between acetate C2 and glutamate C4 in the aliphatic region. This technique can be applied to studying acetate transport and metabolism in brain in the carboxylic/amide region without spectral interference. © 2011 Elsevier Inc. All rights reserved. Source

Liu Y.,Jiangxi Provincial Women and Children Hospital | Wei X.,BGI Wuhan | Kong X.,Zhengzhou University | Guo X.,BGI Wuhan | And 8 more authors.
PLoS ONE | Year: 2015

Background: Targeted next-generation sequencing (NGS) is a cost-effective approach for rapid and accurate detection of genetic mutations in patients with suspected genetic disorders, which can facilitate effective diagnosis. Methodology/Principal Findings: We designed a capture array to mainly capture all the coding sequence (CDS) of 2,181 genes associated with 561 Mendelian diseases and conducted NGS to detect mutations. The accuracy of NGS was 99.95%, which was obtained by comparing the genotypes of selected loci between our method and SNP Array in four samples from normal human adults. We also tested the stability of the method using a sample from normal human adults. The results showed that an average of 97.79% and 96.72% of single-nucleotide variants (SNVs) in the sample could be detected stably in a batch and different batches respectively. In addition, the method could detect various types of mutations. Some disease-causing mutations were detected in 69 clinical cases, including 62 SNVs, 14 insertions and deletions (Indels), 1 copy number variant (CNV), 1 microdeletion and 2 microduplications of chromosomes, of which 35 mutations were novel. Mutations were confirmed by Sanger sequencing or real-time polymerase chain reaction (PCR). Conclusions/Significance: Results of the evaluation showed that targeted NGS enabled to detect disease-causing mutations with high accuracy, stability, speed and throughput. Thus, the technology can be used for the clinical diagnosis of 561 Mendelian diseases. Copyright: © 2015 Liu et al. Source

Wang Z.,Huazhong University of Science and Technology | Du T.,Wuhan Medical and Health Center for Women and Children | Dong X.,Huazhong University of Science and Technology | Li Z.,Huazhong University of Science and Technology | And 2 more authors.
International Journal of Oncology | Year: 2016

Epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) have revolutionized the treatment for non-small cell lung cancer patients, but acquired resistance limit the efficiency of this treatment. As a homeostatic cellular recycling mechanism, autophagy has been proposed to participate in the EGFR-TKI resistance. However, the role of autophagy in lung cancer treatment and the underlying mechanisms have not been clarified. In this study, we found the sensitivity to erlotinib, a well-used EGFR-TKI, was correlated with basal autophagy level. Erlotinib was able to induce autophagy not only in TKI-sensitive, but also TKI-resistant cancer cells. Inhibition of autophagy significantly enhanced cytotoxicity of erlotinib in TKI-resistant cancer cells via modulation of endoplasmic reticulum (ER) stress induced apoptosis. In this process, CCAAT/enhancer binding protein homologous protein (CHOP) acted as an executioner. Downregulation of CHOP with siRNA blocked the autophagy inhibition and erlotinib co-treatment induced apoptosis and prevented cancer cells from this co-treatment-induced cell death. Our findings suggest that autophagy inhibition overcomes erlotinib resistance through modulation of ER stress mediated apoptosis. Source

Wang Z.-L.,Huazhong University of Science and Technology | Du T.-T.,Wuhan Medical and Health Center for Women and Children | Zhang R.-G.,Huazhong University of Science and Technology
Journal of Huazhong University of Science and Technology - Medical Science | Year: 2016

In patients with advanced cancer, cancer-induced bone pain (CIBP) is a severe and common problem that is difficult to manage and explain. As c-Jun N-terminal kinase (JNK) and chemokine (C-X-C motif) ligand 1 (CXCL1) have been shown to participate in several chronic pain processes, we investigated the role of JNK and CXCL1 in CIBP and the relationship between them. A rat bone cancer pain model was established by intramedullary injection of Walker 256 rat gland mammary carcinoma cells into the left tibia of Sprague-Dawley rats. As a result, intramedullary injection of Walker 256 carcinoma cells induced significant bone destruction and persistent pain. Both phosphorylated JNK1 (pJNK1) and pJNK2 showed time-dependent increases in the ipsilateral spinal cord from day 7 to day 18 after tumor injection. Inhibition of JNK activation by intrathecal administration of SP600125, a selective pJNK inhibitor, attenuated mechanical allodynia and heat hyperalgesia caused by tumor inoculation. Tumor cell inoculation also induced robust CXCL1 upregulation in the ipsilateral spinal cord on day 18 after tumor injection. Inhibition of CXCL1 by intrathecal administration of CXCL1 neutralizing antibody showed a stable analgesic effect. Intrathecal administration of SP600125 reduced CXCL1 increase in the spinal cord, whereas inhibition of CXCL1 in the spinal cord showed no influence on JNK activation. Taken together, these results suggested that JNK activation in spinal cord contributed to the maintenance of CIBP, which may act through modulation of CXCL1. Inhibition of the pJNK/CXCL1 pathway may provide a new choice for treatment of CIBP. © 2016, Huazhong University of Science and Technology and Springer-Verlag Berlin Heidelberg. Source

Discover hidden collaborations