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Li XC, Chen X, Zheng X, Zhao C, Chen JX, Zhuo JL. Abstract 102: Genetic Deletion of Sirtuin 3 (SIRT3) in the Mitochondria of the Proximal Tubules Aggravates Angiotensin II-Induced Hypertension by Impairing the Pressure-Natriuresis Response in Proximal Tubule-Specific SIRT3 Knockout Mice. Hypertension 2019. [DOI: 10.1161/hyp.74.suppl_1.102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Sirtuin 3 (SIRT3), a key mitochondrial protein in the sirtuin family, plays a key role in maintaining normal mitochondrial function via its anti-oxidative, anti-aging, and anti-inflammatory effects. Conversely, angiotensin II (ANG II), a key peptide of the renin-angiotensin system, plays a key role in the development of cardiovascular and hypertensive injury through its vasoconstrictive, pro-oxidative, pro-growth, and proinflammatory actions, in part by suppressing mitochondrial SIRT3 expression and inducing mitochondrial dysfunction. The present study tested the hypothesis that genetic deletion of SIRT3 selectively in the proximal tubules of the kidney aggravates ANG II-induced hypertension in proximal tubule (PT)-specific SIRT3 knockout mice (PT-SIRT3-KO). PT-SIRT3-KO mice were generated using the SGLT2-Cre/SIRT3-loxP approach. ANG II-dependent hypertension was induced by infusing a slow pressor dose of ANG II, 0.5 mg/kg/day, i.p., and a 2% Na
+
diet for 2 weeks in adult male wildtype (WT) and PT-SIRT3-KO mice (n=7-12 per group). PT-SIRT3-KO mice developed normally, and showed no abnormal cardiac and kidney structures. Under basal conditions, systolic, diastolic and mean arterial pressure were significantly lower (WT: 119 ± 3 mmHg vs. PT-SIRT3-KO: 111 ± 3 mmHg,
P
<0.05), whereas urinary Na
+
excretion was significantly higher in PT-SIRT3-KO than WT mice (WT: 167.9 ± 5.8 μmol/24 h vs. PT-SIRT3-KO: 217.9 ± 7.9 μmol/24 h,
P
<0.05), without altering urinary K
+
excretion. ANG II infusion significantly increased systolic blood pressure by 24 ± 3 mmHg in WT mice (
P
<0.01), whereas it increased systolic blood pressure by 38 ± 3 mmHg in PT-SIRT3-KO mice (
P
<0.01). Conversely, ANG II-induced hypertension was associated with a marked natriuretic response in WT mice (547.7 ± 19.9 μmol/24 h), which was attenuated in PT-SIRT3-KO mice (312.1 ± 11.1 μmol/24 h,
P
<0.01). Proximal tubule-specific SIRT3 deletion slightly increased the kidney to body wt. ratio (n.s.), but significantly attenuated the heart to body wt. ratio in PT-SIRT3-KO mice (
P
<0.01). Our results suggest that genetic deletion of mitochondrial SIRT3 in the proximal tubules of the kidney aggravates ANG II-induced hypertension by impairing the pressure-natriuretic response in PT-SIRT3-KO mice.
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Ran SJ, Yang X, Sun Z, Zhang Y, Chen JX, Wang DM, Liu B. Effect of length of apical root resection on the biomechanical response of a maxillary central incisor in various occlusal relationships. Int Endod J 2019; 53:111-121. [PMID: 31454089 DOI: 10.1111/iej.13211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 08/22/2019] [Indexed: 11/27/2022]
Abstract
AIM To investigate the stress distribution and tooth displacement of a maxillary central incisor with various apical root resection lengths and occlusal relationships using finite element (FE) analysis. METHODOLOGY A maxillary central incisor was scanned by micro-CT. First, the FE intact incisor model with dentine, enamel, pulp and root surrounded by alveolar bone and periodontal ligament was designed based on the micro-CT image data. Then, six FE models with varying lengths of apical root resection were established to simulate the clinical treatment and reveal the clinically applicable limit of apical root resection during endodontic microsurgery. For each model under different loading conditions, the maximum von Mises stress (σ max) at the root apex, root cervix, alveolar bone and periodontal ligament and the maximum tooth displacement (ΔR max) were calculated and compared. RESULTS In a normal occlusion, more than 6 mm of root resection resulted in a marked increase in the ΔR max values (>10%) and σ max values of alveolar bone (>50%); the stress levels at the root apex increased dramatically when the apical root was resected more than 7 mm. With increased overjet, apical root resection did not change the stress level markedly until it reached 8 mm, but the ΔR max increased markedly (>10%) if the root was resected more than 5 mm. With deep overbites, the σ max increased significantly (>50%) when the root was resected more than 4 mm whilst the ΔR max decreased. With increased overjet and deep overbite, more than 6 mm of resection resulted in a substantial σ max increase (>50%) of alveolar bone and the ΔR max increased markedly (>10%) when the root was resected 8 mm. Additionally, the σ max and the ΔR max values were greater with increased overjet and lower with deep overbites. CONCLUSIONS Using FE analysis, apical root resection of more than 6 mm resulted in a marked increase of stress distribution and tooth displacement in normal and increased overjet with deep overbite occlusal relationships. In increased overjets or deep overbites, more than 5 mm or 4 mm, respectively, stress distribution and tooth displacement increased markedly.
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Yang ZY, Cheng CF, Lv H, Chen ZH, Chen JX, Ou YW. Multichannel continuous-wave fiber cavity ringdown gas sensing utilizing frequency-shifted interferometry. APPLIED OPTICS 2018; 57:10224-10229. [PMID: 30645233 DOI: 10.1364/ao.57.010224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 11/08/2018] [Indexed: 06/09/2023]
Abstract
We present a multichannel continuous-wave (CW) fiber cavity ringdown (FCRD) gas sensing method based on frequency-shifted interferometry (FSI). This scheme detects gas concentration by measuring the intensity decay rates of continuous light from different ringdown cavities in the spatial domain, unlike conventional FCRD techniques, which measure the decay rates of pulse light in the time domain. This method shares one CW light source, one slow detector, and one slow data collector. In order to illustrate the theory, acetylene gas concentration measurement in a two-channel FSI-FCRD system was experimentally conducted in the range of 0%-1%. A linear relation was established between concentration and absorption loss, which is proportional to the intensity decay rate, and the measurement resolutions of 3.871%/dB and 3.658%/dB were achieved, respectively. The results reveal that the proposed system has the advantages of low cost, high sensitivity, high precision, and good stability in multichannel gas detection.
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Wu HY, Chen JX, Zhu H, Zhou NX. [Internal carotid artery aneurysms with the initial symptom of epistaxis: a case report]. LIN CHUANG ER BI YAN HOU TOU JING WAI KE ZA ZHI = JOURNAL OF CLINICAL OTORHINOLARYNGOLOGY, HEAD, AND NECK SURGERY 2018; 30:665-666. [PMID: 29871106 DOI: 10.13201/j.issn.1001-1781.2016.08.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Indexed: 11/12/2022]
Abstract
The patient has complained of twice left nose bleeding. Nasal endoscope examination found bloodstain in recessus sphenoethmoidalis, while nasal sinuses MR examination showed moderate and slightly high signal in left sphenoid sinus on T₁WI and T₂WI. Then, she was underwent nasal endoscopic surgery to stop bleeding. A dark red, pulsating tissue was found above the lateral wall of the sphenoid sinus during the surgery. After the surgery, the patient did a cerebral digital vascular angiography and the diagnosis was internal carotid artery aneurysms rupture.
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Li LH, Jiang WZ, Kang DY, Liu X, Li HS, Guan GX, Zhuo SM, Chen ZF, Chen JX. Second-harmonic imaging microscopy for identifying colorectal intraepithelial neoplasia. J Microsc 2018; 271:31-35. [PMID: 29505679 DOI: 10.1111/jmi.12690] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 01/05/2018] [Accepted: 02/06/2018] [Indexed: 11/28/2022]
Abstract
In this study, second-harmonic imaging microscopy was used to monitor precancerous colorectal lesions at different stages. It was found that the morphology of glands and lamina propria in mucosa changes with the progression of colorectal diseases from normal to low-grade intraepithelial neoplasia to high-grade intraepithelial neoplasia and this microscopy has the ability of direct visualization of these warning symptoms. Furthermore, two morphologic variables were quantified to determine the changes of glands and collagen in lamina propria during the development of colorectal intraepithelial neoplasia. These results suggest that second-harmonic imaging microscopy has the potential in label-freely and effectively distinguishing between normal and precancerous colorectal tissues, and will be helpful for early diagnosis and treatment of colorectal diseases.
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Liao CX, Wang ZY, Zhou Y, Zhou LQ, Zhu XQ, Liu WG, Chen JX. Label-free identification of the microstructure of rat spinal cords based on nonlinear optical microscopy. J Microsc 2017; 267:143-149. [PMID: 28319259 DOI: 10.1111/jmi.12554] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 01/26/2017] [Accepted: 02/14/2017] [Indexed: 11/28/2022]
Abstract
The spinal cord is a vital link between the brain and the body and mainly comprises neurons, glial cells and nerve fibres. In this work, nonlinear optical (NLO) microscopy based on intrinsic tissue properties was employed to label-freely analyze the cells and matrix in spinal cords at a molecular level. The high-resolution and high-contrast NLO images of unstained spinal cords demonstrate that NLO microscopy has the ability to show the microstructure of white and grey matter including ventral horn, intermediate area, dorsal horns, ventral column, lateral column and dorsal column. Neurons with various sizes were identified in grey matter by dark spots of nonfluorescent nuclei encircled by cytoplasm-emitting two-photon excited fluorescence signals. Nerve fibres and neuroglias were observed in white matter. Besides, the spinal arteries were clearly presented by NLO microscopy. Using spectral and morphological information, this technique was proved to be an effective tool for label-freely imaging spinal cord tissues, based on endogenous signals in biological tissue. With future development, we foresee promising applications of the NLO technique for in vivo, real-time assessment of spinal cord diseases or injures.
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Peng XY, Chen ZJ, Zhang X, Du TF, Hu ZM, Ge LJ, Zhang YM, Sun JQ, Gorini G, Nocente M, Tardocchi M, Hu LQ, Zhong GQ, Pu N, Lin SY, Wan BN, Li XQ, Zhang GH, Chen JX, Fan TS. Measurement and simulation of the response function of time of flight enhanced diagnostics neutron spectrometer for beam ion studies at EAST tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D836. [PMID: 27910376 DOI: 10.1063/1.4960603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The 2.5 MeV TOFED (Time-Of-Flight Enhanced Diagnostics) neutron spectrometer with a double-ring structure has been installed at Experimental Advanced Superconducting Tokamak (EAST) to perform advanced neutron emission spectroscopy diagnosis of deuterium plasmas. This work describes the response function of the TOFED spectrometer, which is evaluated for the fully assembled instrument in its final layout. Results from Monte Carlo simulations and dedicated experiments with pulsed light sources are presented and used to determine properties of light transport from the scintillator. A GEANT4 model of the TOFED spectrometer was developed to calculate the instrument response matrix. The simulated TOFED response function was successfully benchmarked against measurements of the time-of-flight spectra for quasi-monoenergetic neutrons in the energy range of 1-4 MeV. The results are discussed in relation to the capability of TOFED to perform beam ion studies on EAST.
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Jiang LW, Wang XF, Wu ZY, Lin PH, Du HP, Wang S, Li LH, Fang N, Zhuo SM, Kang DZ, Chen JX. Label-free detection of fibrillar collagen deposition associated with vascular elements in glioblastoma multiforme by using multiphoton microscopy. J Microsc 2016; 265:207-213. [PMID: 27643398 DOI: 10.1111/jmi.12476] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 08/22/2016] [Accepted: 08/26/2016] [Indexed: 12/14/2022]
Abstract
Glioblastoma multiforme (GBM-WHO grade IV) is the most common and the most aggressive form of brain tumors in adults with the median survival of 10-12 months. The diagnostic detection of extracellular matrix (ECM) component in the tumour microenvironment is of prognostic value. In this paper, the fibrillar collagen deposition associated with vascular elements in GBM were investigated in the fresh specimens and unstained histological slices by using multiphoton microscopy (MPM) based on two-photon excited fluorescence (TPEF) and second harmonic generation (SHG). Our study revealed the existence of fibrillar collagen deposition in the adventitia of remodelled large blood vessels and in glomeruloid vascular structures in GBM. The degree of fibrillar collagen deposition can be quantitatively evaluated by measuring the adventitial thickness of blood vessels or calculating the ratio of SHG pixel to the whole pixel of glomeruloid vascular structure in MPM images. These results indicated that MPM can not only be employed to perform a retrospective study in unstained histological slices but also has the potential to apply for in vivo brain imaging to understand correlations between malignancy of gliomas and fibrillar collagen deposition.
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Xu LL, Long CY, Wang JL, Yu M, Chen JX. Involvement of oxidative stress in tri-ortho-cresyl phosphate-induced liver injury in male mice. Hum Exp Toxicol 2016; 35:1093-101. [PMID: 26757727 DOI: 10.1177/0960327115621363] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Tri-ortho-cresyl phosphate (TOCP) has been widely used as plasticizers, plastic softeners, and flame retardants in industry and reported to have delayed neurotoxicity and reproductive toxicology in animals. However, it remains to be elusive whether TOCP induces liver injury. In this study, male mice were orally administered different concentrations of TOCP (100, 200, or 400 mg/kg/day) for 28 days. Histological examination showed that TOCP led to serious hepatocellular injury. In addition, administration of TOCP induced a marked elevation in the serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels in mice. The content of malondialdehyde (MDA) was increased significantly in the liver after the mice were treated with TOCP; while there was a dramatic decrease in the content of glutathione (GSH) and the activities of antioxidative enzymes superoxide dismutase (SOD) and glutathione peroxidase (GSH-PX). TOCP inhibited viability of mouse liver cancer Hepa 1-6 cells in a dose-dependent manner. Meanwhile, TOCP significantly increased MDA content and inhibited GSH content and the activities of SOD and GSH-PX in the cells, respectively. Oxidative stress dramatically inhibited viability of Hepa 1-6 cells; while inhibition of oxidative stress by N-acetyl-l-cysteine could rescue the cell viability inhibited by TOCP to a certain extent. In summary, oxidative stress might be involved in TOCP-induced hepatocellular injury in male mice.
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Chen JX, Cai GY, Chen XM, Liu H, Chen X, Peng YM, Liu FY, Li Z, Shi SZ. Effect of TIMP1 transfection on PTEN expression in human kidney proximal tubular cells. GENETICS AND MOLECULAR RESEARCH 2015; 14:17373-83. [PMID: 26782378 DOI: 10.4238/2015.december.21.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
To explore the role of metalloproteinase-1 (TIMP-1) tissue inhibitor in the mechanisms of kidney aging, we observed the effects of sense and antisense transfection of TIMP-1 and of metalloproteinase (MMP) inhibitors on phosphatase and tensin homolog (PTEN), vascular endothelial growth factor (VEGF), and Flk-1 expression in TIMP-1 transgenic human proximal tubular epithelial cells (HKCs). Transfected HKCs were co-incubated with 100 μM MMP-2 and MMP-9 inhibitor III for 24 h to affect enzyme inhibition. TIMP-1, MMP-2, MMP-9, PTEN, VEGF, and Flk-1 mRNA expression was detected by reverse transcription-polymerase chain reaction. PTEN, VEGF, and Flk-1 protein expression in cells of each experimental group was measured by indirect immunofluorescence. We found that PTEN expression was up-regulated (P < 0.05) in the sense TIMP-1-transfected group (P < 0.05) compared with the non-transfected and empty vector groups, and that expression of VEGF and Flk-1 was down-regulated (P < 0.05). In contrast, the antisense TIMP-1 transgenic group showed the opposite results (P < 0.05). No significant differences in expression of PTEN, VEGF, or Flk-1 were observed among the MMP- 2/MMP-9 inhibitor III, non-transfected, and empty vector groups (P > 0.05). These results suggest that in the progression of renal aging, high expression of TIMP-1 up-regulates PTEN expression through an MMP-independent pathway, and subsequently down-regulates the expression of VEGF and Flk-1, indicating that PTEN and TIMP-1 are involved in the aging-associated impairment of renal angiogenesis. Our study provides a theoretical basis for further exploration of the mechanism underlying TIMP- 1 participation in renal aging progression.
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Zheng QH, Wu XL, Che XL, Weng ML, Chen JX, Zou Y. Chemotherapy combined with target drugs in the treatment of advanced colorectal cancer: a meta-analysis based on Chinese patients. Indian J Cancer 2015; 51 Suppl 3:e110-2. [PMID: 25818735 DOI: 10.4103/0019-509x.154100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Colorectal carcinoma is one of most diagnosed solid malignant carcinoma. The chemotherapy combined with target drugs in the treatment of advanced colorectal cancer in not conclusive. METHODS The clinical studies reporting the activity and adverse events between chemotherapy alone versus chemotherapy combined with anti-epidermal growth factor receptor drugs were screened in the databases of Medline, the Cochrane Library, Wanfang and CNKI and included in this meta-analysis. The risk ratio (RR) and its 95% confidence interval (CI) for treatment response and adverse events were pooled by random or fixed effect model. RESULTS A total of 10 clinical studies reporting chemotherapy combined with the target in the treatment of advanced colorectal cancer were included in this study. The pooled RR was 3.26 (95% CI: 1.74-6.11, P < 0.05), 1.49 (95% CI: 1.23-1.80) and 1.65 (95% CI: 1.37-1.98) for complete response (CR), partial response and objective response rate, respectively. For nausea and vomiting events, the RR was 1.62 (95% CI: 1.33-1.97, P < 0.05) indicating higher incidence of nausea and vomiting was observed in the combined group compared with chemotherapy alone. However, the diarrhea (RR = 1.10, 95% CI: 0.86-1.42, P > 0.05), liver function damage (RR = 1.03, 95% CI: 0.74-1.42), myelosuppression (RR = 1.04, 95% CI: 0.83-1.31) and neurotoxicity (RR = 1.12, 95% CI: 0.93-1.35) were not different between the two groups. CONCLUSION For Chinese patients with advanced colorectal cancer, chemotherapy combined with target drug can improve the response rate, but also increase the risk of nausea and vomiting.
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Zhu XQ, Xu YH, Liao CX, Liu WG, Cheng KK, Chen JX. Differentiating the extent of cartilage repair in rabbit ears using nonlinear optical microscopy. J Microsc 2015; 260:219-26. [PMID: 26366638 DOI: 10.1111/jmi.12288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Accepted: 06/09/2015] [Indexed: 11/26/2022]
Abstract
Nonlinear optical microscopy (NLOM) was used as a noninvasive and label-free tool to detect and quantify the extent of the cartilage recovery. Two cartilage injury models were established in the outer ears of rabbits that created a different extent of cartilage recovery based on the presence or absence of the perichondrium. High-resolution NLOM images were used to measure cartilage repair, specifically through spectral analysis and image texture. In contrast to a wound lacking a perichondrium, wounds with intact perichondria demonstrated significantly larger TPEF signals from cells and matrix, coarser texture indicating the more deposition of type I collagen. Spectral analysis of cells and matrix can reveal the matrix properties and cell growth. In addition, texture analysis of NLOM images showed significant differences in the distribution of cells and matrix of repaired tissues with or without perichondrium. Specifically, the decay length of autocorrelation coefficient based on TPEF images is 11.2 ± 1.1 in Wound 2 (with perichondrium) and 7.5 ± 2.0 in Wound 1 (without perichondrium), indicating coarser image texture and faster growth of cells in repaired tissues with perichondrium (p < 0.05). Moreover, the decay length of autocorrelation coefficient based on collagen SHG images also showed significant difference between Wound 2 and 1 (16.2 ± 1.2 vs. 12.2 ± 2.1, p < 0.05), indicating coarser image texture and faster deposition of collagen in repaired tissues with perichondrium (Wound 2). These findings suggest that NLOM is an ideal tool for studying cartilage repair, with potential applications in clinical medicine. NLOM can capture macromolecular details and distinguish between different extents of cartilage repair without the need for labelling agents.
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Yang Y, Xie YJ, Xu Q, Chen JX, Shan NC, Zhang Y. Down-regulation of miR-1246 in cervical cancer tissues and its clinical significance. Gynecol Oncol 2015; 138:683-8. [PMID: 26074491 DOI: 10.1016/j.ygyno.2015.06.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 05/25/2015] [Accepted: 06/09/2015] [Indexed: 02/07/2023]
Abstract
OBJECTIVE MicroRNAs (miRNAs) are non-coding RNAs that regulate the expression of mRNAs by binding to their 3'-untranslated regions (UTRs). Accumulating evidences show that miRNAs are involved in tumorigenesis such as lung cancer, liver cancer, colon cancer, and cervical cancer. In this study, we focused on the expression of miR-1246 in clinical cervical cancer tissues as well as the relationship between miR-1246 and HPV16E6 infection status. METHODS Real-time quantitative polymerase chain reaction technology was used to detect the expression of miR-1246 in 68 cervical cancer tissues and 52 normal tissues. The expression of miR-1246 also was tested in HPV16E6 negative cervical cell line (SiHa) or HPV16E6 positive cell line (C33A). Western blot was performed to detect the expression of DYRK1A after knocking down HPV16E6. RESULTS Our data showed that the expression of miR-1246 was dramatically decreased in cervical cancer tissue, compared with normal control group (p=0.0012), and miR-1246 was negatively correlated with clinical stage and HPV16E6 infected status (p=0.0410), but no correlation was observed with age, tumor diameter, cervical invasion depth, lymph node metastasis, or vascular invasion (p>0.05). Knock down of HPV16E6 significantly raised DYRK1A protein expression targeted by miR-1246. CONCLUSIONS The expression of miR-1246 is negatively correlated with cervical cancer procedure as well as HPV16E6 infection status and the miR-1246 may act as a diagnostic biomarker for cervical cancer. In addition, HPV16E6 infection may be a major reason leading to decrease the expression of miR-1246 in cervical cancer. This finding contributes to deep understanding of the miR-1246 function in cervical carcinogenesis.
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Du TF, Chen ZJ, Peng XY, Yuan X, Zhang X, Gorini G, Nocente M, Tardocchi M, Hu ZM, Cui ZQ, Xie XF, Ge LJ, Hu LQ, Zhong GQ, Lin SY, Wan BN, Li XQ, Zhang GH, Chen JX, Fan TS. Design of the radiation shielding for the time of flight enhanced diagnostics neutron spectrometer at Experimental Advanced Superconducting Tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E115. [PMID: 25430294 DOI: 10.1063/1.4891059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A radiation shielding has been designed to reduce scattered neutrons and background gamma-rays for the new double-ring Time Of Flight Enhanced Diagnostics (TOFED). The shielding was designed based on simulation with the Monte Carlo code MCNP5. Dedicated model of the EAST tokamak has been developed together with the emission neutron source profile and spectrum; the latter were simulated with the Nubeam and GENESIS codes. Significant reduction of background radiation at the detector can be achieved and this satisfies the requirement of TOFED. The intensities of the scattered and direct neutrons in the line of sight of the TOFED neutron spectrometer at EAST are studied for future data interpretation.
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Peng XY, Chen ZJ, Zhang X, Hu ZM, Du TF, Cui ZQ, Xie XF, Ge LJ, Yuan X, Gorini G, Nocente M, Tardocchi M, Hu LQ, Zhong GQ, Lin SY, Wan BN, Li XQ, Zhang GH, Chen JX, Fan TS. Light output function and assembly of the time-of-flight enhanced diagnostics neutron spectrometer plastic scintillators for background reduction by double kinematic selection at EAST. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E112. [PMID: 25430291 DOI: 10.1063/1.4886762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The 2.5 MeV neutron spectrometer TOFED (Time-Of-Flight Enhanced Diagnostics) has been constructed to perform advanced neutron emission spectroscopy diagnosis of deuterium plasmas on EAST. The instrument has a double-ring structure which, in combination with pulse shape digitization, allows for a dual kinematic selection in the time-of-flight/recoil proton energy (tof/Ep) space, thus improving the spectrometer capability to resolve fast ion signatures in the neutron spectrum, in principle up to a factor ≈100. The identification and separation of features from the energetic ions in the neutron spectrum depends on the detailed knowledge of the instrument response function, both in terms of the light output function of the scintillators and the effect of undesired multiple neutron scatterings in the instrument. This work presents the determination of the light output function of the TOFED plastic scintillator detectors and their geometrical assembly. Results from dedicated experiments with γ-ray sources and quasi-monoenergetic neutron beams are presented. Implications on the instrument capability to perform background suppression based on double kinematic selection are discussed.
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Cui ZQ, Chen ZJ, Xie XF, Peng XY, Hu ZM, Du TF, Ge LJ, Zhang X, Yuan X, Xia ZW, Hu LQ, Zhong GQ, Lin SY, Wan BN, Fan TS, Chen JX, Li XQ, Zhang GH. Design of a magnetic shielding system for the time of flight enhanced diagnostics neutron spectrometer at Experimental Advanced Superconducting Tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D829. [PMID: 25430242 DOI: 10.1063/1.4890536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The novel neutron spectrometer TOFED (Time of Flight Enhanced Diagnostics), comprising 90 individual photomultiplier tubes coupled with 85 plastic scintillation detectors through light guides, has been constructed and installed at Experimental Advanced Superconducting Tokamak. A dedicated magnetic shielding system has been constructed for TOFED, and is designed to guarantee the normal operation of photomultiplier tubes in the stray magnetic field leaking from the tokamak device. Experimental measurements and numerical simulations carried out employing the finite element method are combined to optimize the design of the magnetic shielding system. The system allows detectors to work properly in an external magnetic field of 200 G.
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Chen ZJ, Peng XY, Zhang X, Du TF, Hu ZM, Cui ZQ, Ge LJ, Xie XF, Yuan X, Gorini G, Nocente M, Tardocchi M, Hu LQ, Zhong GQ, Lin SY, Wan BN, Li XQ, Zhang GH, Chen JX, Fan TS. Data acquisition system with pulse height capability for the TOFED time-of-flight neutron spectrometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D830. [PMID: 25430243 DOI: 10.1063/1.4885474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new time-of-flight neutron spectrometer TOFED has been constructed for installation at Experimental Advanced Superconducting Tokamak. A data acquisition system combining measurements of flight time and energy from the interaction of neutrons with the TOFED scintillators has been developed. The data acquisition system can provide a digitizing resolution better than 1.5% (to be compared with the >10% resolution of the recoil particle energy in the plastic scintillators) and a time resolution <1 ns. At the same time, it is compatible with high count rate event recording, which is an essential feature to investigate phenomena occurring on time scales faster than the slowing down time (≈100 ms) of the beam ions in the plasma. Implications of these results on the TOFED capability to resolve fast ion signatures in the neutron spectrum from EAST plasmas are discussed.
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Hu ZM, Xie XF, Chen ZJ, Peng XY, Du TF, Cui ZQ, Ge LJ, Li T, Yuan X, Zhang X, Hu LQ, Zhong GQ, Lin SY, Wan BN, Gorini G, Li XQ, Zhang GH, Chen JX, Fan TS. Monte Carlo simulation of a Bonner sphere spectrometer for application to the determination of neutron field in the Experimental Advanced Superconducting Tokamak experimental hall. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E417. [PMID: 25430324 DOI: 10.1063/1.4891163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
To assess the neutron energy spectra and the neutron dose for different positions around the Experimental Advanced Superconducting Tokamak (EAST) device, a Bonner Sphere Spectrometer (BSS) was developed at Peking University, with totally nine polyethylene spheres and a SP9 (3)He counter. The response functions of the BSS were calculated by the Monte Carlo codes MCNP and GEANT4 with dedicated models, and good agreement was found between these two codes. A feasibility study was carried out with a simulated neutron energy spectrum around EAST, and the simulated "experimental" result of each sphere was obtained by calculating the response with MCNP, which used the simulated neutron energy spectrum as the input spectrum. With the deconvolution of the "experimental" measurement, the neutron energy spectrum was retrieved and compared with the preset one. Good consistence was found which offers confidence for the application of the BSS system for dose and spectrum measurements around a fusion device.
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Wu JS, Chen YP, Wang LC, Yang YJ, Deng CW, Hou BX, He ZL, Chen JX. Implication of polymorphisms in DNA repair genes with an increased risk of hepatocellular carcinoma. GENETICS AND MOLECULAR RESEARCH 2014; 13:3812-8. [PMID: 24938468 DOI: 10.4238/2014.may.16.5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We explored the association between 4 XRCC1 (Arg194Trp and Arg399Gln) and XPD (Asp312Asn and Lys751Gln) polymorphisms with the development and prognosis of hepatocellular carcinoma (HCC). A total of 218 cases with HCC and 277 healthy controls were included in the study. Genotyping of the XRCC1 (Arg194Trp and Arg399Gln) and XPD (Asp312Asn and Lys751Gln) polymorphisms was performed in a 384-well plate format on the Sequenom MassARRAY platform. We found that individuals with the XRCC1 399AA genotype had a higher risk of HCC compared with the GG genotype (odds ratio, OR = 1.85, 95% confidence interval, CI = 1.03-3.23). Similarly, individuals carrying the XPD 751GG genotype showed a greatly increased risk of HCC (OR = 2.97, 95%CI = 126- 7.38). Cox regression analysis showed that individuals carrying XPD 751Gln/Gln genotypes had a 0.30-fold increased risk of death from HCC. These results suggest that polymorphisms in XRCC1 and XPD may have functional significance in HCC.
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Miura H, Shiraishi Y, Yambe T, Chen JX, Sugai TK. Template for preparation of papers for IEEE sponsored conferences & Symposia. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:1351-4. [PMID: 22254567 DOI: 10.1109/iembs.2011.6090318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Rotary blood pumps which have contact-less suspension are small, durable and widely used for left ventricular assist devices (LVADs). In order to design a total artificial heart (TAH) with rotary blood pumps, two pumps one for each ventricle, are controlled independently. Some of the challenges for the development of a TAH includes the requirement of a small size and the anatomical fitting of inlets and outlets which should be arranged closely on the circumference in the same direction. And they should be combined into a unit. In this paper, a helical flow total artificial heart (HFTAH) combing two centrifugal pumps with helical inlet in face is proposed in order to achieve a smaller TAH. To examine the pump performance, a preliminary test model for left ventricle was built, the size of the pump was 69.0mm in diameter and 45.0mm height. The size of the impeller was 44.0mm in diameter and 23.0mm height including a 15.0mm-height hydrodynamic bearing. The pump was externally driven by a direct current motor. 5.0L/min flow rate against 100mmHg pressure difference was obtained, where the total power consumption was 5.0W, the system efficiency was 23% with a rotational speed of 2070rpm. In this system, maximum pressure head, flow rate and efficiency were 420mmHg, 15.0L/min and 26%, respectively. In acute animal experiments with three healthy adult goats, the total biventricular bypass assist system using the pumps was able to maintain the maximum aortic flow at approximately 5.0L/min, and the pulmonary arterial flow at approximately 4.6L/min, the mean aorta pressure was 105mmHg, and the mean pulmonary artery pressure was 51mmHg. The development of the control method is undergoing, and a driving system and the pump aiming at the chronic animal experiments will be developed.
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Ai L, Weng YB, Elsheikha HM, Zhao GH, Alasaad S, Chen JX, Li J, Li HL, Wang CR, Chen MX, Lin RQ, Zhu XQ. Genetic diversity and relatedness of Fasciola spp. isolates from different hosts and geographic regions revealed by analysis of mitochondrial DNA sequences. Vet Parasitol 2011; 181:329-34. [PMID: 21524854 DOI: 10.1016/j.vetpar.2011.03.057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 03/24/2011] [Accepted: 03/31/2011] [Indexed: 10/18/2022]
Abstract
The present study examined sequence variability in a portion of the mitochondrial cytochrome c oxidase subunit 1 (pcox1) and NADH dehydrogenase subunits 4 and 5 (pnad4 and pnad5) among 39 isolates of Fasciola spp., from different hosts from China, Niger, France, the United States of America, and Spain; and their phylogenetic relationships were re-constructed. Intra-species sequence variations were 0.0-1.1% for pcox1, 0.0-2.7% for pnad4, and 0.0-3.3% for pnad5 for Fasciola hepatica; 0.0-1.8% for pcox1, 0.0-2.5% for pnad4, and 0.0-4.2% for pnad5 for Fasciola gigantica, and 0.0-0.9% for pcox1, 0.0-0.2% for pnad4, and 0.0-1.1% for pnad5 for the intermediate Fasciola form. Whereas, nucleotide differences were 2.1-2.7% for pcox1, 3.1-3.3% for pnad4, and 4.2-4.8% for pnad5 between F. hepatica and F. gigantica; were 1.3-1.5% for pcox1, 2.1-2.9% for pnad4, 3.1-3.4% for pnad5 between F. hepatica and the intermediate form; and were 0.9-1.1% for pcox1, 1.4-1.8% for pnad4, 2.2-2.4% for pnad5 between F. gigantica and the intermediate form. Phylogenetic analysis based on the combined sequences of pcox1, pnad4 and pnad5 revealed distinct groupings of isolates of F. hepatica, F. gigantica, or the intermediate Fasciola form irrespective of their origin, demonstrating the usefulness of the mtDNA sequences for the delineation of Fasciola species, and reinforcing the genetic evidence for the existence of the intermediate Fasciola form.
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Chen MX, Ai L, Zhang RL, Xia JJ, Wang K, Chen SH, Zhang YN, Xu MJ, Li X, Zhu XQ, Chen JX. Sensitive and rapid detection of Paragonimus westermani infection in humans and animals by loop-mediated isothermal amplification (LAMP). Parasitol Res 2010; 108:1193-8. [PMID: 21107864 DOI: 10.1007/s00436-010-2162-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Accepted: 11/10/2010] [Indexed: 12/01/2022]
Abstract
In the present study, a loop-mediated isothermal amplification (LAMP) assay was developed and validated for the detection of Paragonimus westermani adults, metacercariae, and eggs in human and animal samples. The LAMP amplification can be finished in 45 min under isothermal condition at 60°C by employing a set of four species-specific primer mixtures and the results can be checked by naked-eye visualization. No amplification products were detected with deoxyribunucleic acid (DNA) of related trematode species including Fasciola hepatica, Fasciola gigantica, Clonorchis sinensis, Opisthorchis viverrini, Schistosoma mansoni, and Schistosoma japonicum. The method was further validated by examining P. westermani DNA in intermediate hosts including freshwater crabs and crayfish, as well as in sputum and pleural fluid samples from patients of paragonimiasis. These results indicated that the LAMP assay was highly specific, sensitive, and rapid, and it was approximately 100 times more sensitive than conventional specific PCR. The LAMP assay established in this study provides a rapid and sensitive tool for the detection of P. westermani DNA in freshwater crabs, crayfish, sputum, and pleural fluid samples, which has important implications for effective control of human paragonimiasis.
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Chen JX. Investigative strategy for research on biological basis of traditional Chinese medicine syndrome: feature selection-based data mining methods. ACTA ACUST UNITED AC 2010; 8:747-9. [DOI: 10.3736/jcim20100803] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Wang Y, Han XD, Hou YY, Chen JX. UREAPLASMA UREALYTICUMINFECTION RELATED TO SEMINAL PLASMA IMMUNOSUPPRESSIVE FACTORS, SEMEN PH AND LIQUEFACTION DURATION. ACTA ACUST UNITED AC 2009; 51:267-70. [PMID: 16036633 DOI: 10.1080/014850190923413] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In this study, semen samples from fertile and unexplained infertile men were explored for relationships between seminal plasma immunosuppressive factors (SPIFs), semen pH, liquefaction duration and infection of ureaplasma urealyticum (Uu). SPIFs activity was measured by way of counteracting complement. PH was detected by exact pH test paper. Liquefaction duration was observed at 37 degrees C. The results showed that Uu infection ratios of semen samples with abnormal SPIFs, pH or liquefaction duration were markedly higher than those of normal semen samples. It is suggested that Uu infection decreases the level of SPIFs, changes the pH in semen and prolongs the semen liquefaction so as to cause spermatic quality decline. The enhancement of SPIFs level may change the male body against Uu infection.
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Chen JX, Zhang TM, Lim FL, Wu HC, Lei TF, Yeong PK, Xia SJ. Current Knowledge and Attitudes About Organ Donation and Transplantation Among Chinese University Students. Transplant Proc 2006; 38:2761-5. [PMID: 17112824 DOI: 10.1016/j.transproceed.2006.08.140] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Indexed: 11/20/2022]
Abstract
Current attitudes toward organ donation among university students in mainland China and the differences in attitudes between Chinese students in mainland China versus overseas are unknown. To address these issues, we conducted a cross-sectional survey using questionnaires among 922 Chinese undergraduates from mainland China and overseas regions of the world. Data were analyzed by descriptive statistics, Student t tests, chi-square tests, and a logistic regression analysis. We found that blood donors showed significantly better awareness of heart, liver, lung, skin, and tendon donation among commonly transplanted organs/tissues. As to the willingness for cadaveric organ donation, 61.3% of respondents consented, 8.5% objected, and 30.3% answered "not sure." The percentage holding an organ donor card was 15.7% among students from Hong Kong; 3.0%, mainland China; 2.8%, Macau; 2.6%, Taiwan, and 4.0%, other regions of the world. In a logistic regression analysis, female students (odds ratio [OR], 2.24; 95% confidence interval [CI], 1.35 to 3.72) and blood donors (OR, 1.91; 95% CI, 1.10 to 3.32) did, but age and study specialty (medical vs nonmedical) did not show significantly more positive attitudes toward cadaveric organ donation. Compared with students from mainland China, overseas Chinese students from various regions did not show significantly different attitudes toward cadaveric organ donation. In summary, blood donors among university students have a greater knowledge of transplantation and a more positive attitude toward organ donation. Since university students are an important source of blood donors in China, they will be a potential pool of organ donors in the future.
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