2426
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Scholl T, Chen X, Schleuter M, Stein TP. P2-469 Maternal vitamin D status and delivery by cesarean. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976l.97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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2427
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Peng F, Yang Y, Liu J, Jiang Y, Zhu C, Deng X, Hu X, Chen X, Zhong X. Low antioxidant status of serum uric acid, bilirubin and albumin in patients with neuromyelitis optica. Eur J Neurol 2011; 19:277-83. [DOI: 10.1111/j.1468-1331.2011.03488.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Wang J, Hu P, Han G, Zhang L, Li D, Xu R, Chen X, Zhang XD. New nine-coordinate (NH4)3[YbIII(ttha)]·5H2O and eight-coordinate (NH4)[YbIII(pdta)(H2O)2]·5H2O complexes: Structural determination. J STRUCT CHEM+ 2011. [DOI: 10.1134/s002247661103019x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2429
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Cheng Y, Li W, McElfresh TA, Chen X, Berthiaume JM, Castel L, Yu X, Van Wagoner DR, Chandler MP. Changes in myofilament proteins, but not Ca²⁺ regulation, are associated with a high-fat diet-induced improvement in contractile function in heart failure. Am J Physiol Heart Circ Physiol 2011; 301:H1438-46. [PMID: 21765056 DOI: 10.1152/ajpheart.00440.2011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Pathological conditions such as diabetes, insulin resistance, and obesity are characterized by elevated plasma and myocardial lipid levels and have been reported to exacerbate the progression of heart failure (HF). Alterations in cardiomyocyte Ca(2+) regulatory properties and myofilament proteins have also been implicated in contractile dysfunction in HF. However, our prior studies reported that high saturated fat (SAT) feeding improves in vivo myocardial contractile function, thereby exerting a cardioprotective effect in HF. Therefore, we hypothesized that SAT feeding improves contractile function by altering Ca(2+) regulatory properties and myofilament protein expression in HF. Male Wistar rats underwent coronary artery ligation (HF) or sham surgery (SH) and were fed normal chow (SHNC and HFNC groups) or a SAT diet (SHSAT and HFSAT groups) for 8 wk. Contractile properties were measured in vivo [echocardiography and left ventricular (LV) cannulation] and in isolated LV cardiomyocytes. In vivo measures of contractility (peak LV +dP/dt and -dP/dt) were depressed in the HFNC versus SHNC group but improved in the HFSAT group. Isolated cardiomyocytes from both HF groups were hypertrophied and had decreased percent cell shortening and a prolonged time to half-decay of the Ca(2+) transient versus the SH group; however, SAT feeding reduced in vivo myocyte hypertrophy in the HFSAT group only. The peak velocity of cell shortening was reduced in the HFNC group but not the HFSAT group and was positively correlated with in vivo contractile function (peak LV +dP/dt). The HFNC group demonstrated a myosin heavy chain (MHC) isoform switch from fast MHC-α to slow MHC-β, which was prevented in the HFSAT group. Alterations in Ca(2+) transients, L-type Ca(2+) currents, and protein expression of sarco(endo)plasmic reticulum Ca(2+)-ATPase and phosphorylated phospholamban could not account for the changes in the in vivo contractile properties. In conclusion, the cardioprotective effects associated with SAT feeding in HF may occur at the level of the isolated cardiomyocyte, specifically involving changes in myofilament function but not sarcoplasmic reticulum Ca(2+) regulatory properties.
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2430
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Chen X, Li S, Li C, Zhao S, Serap A. Phytogeny of genusGlossina (Diptera:Glossinidae) according to ITS2 sequences. ACTA ACUST UNITED AC 2011; 42:249-58. [PMID: 20229338 DOI: 10.1007/bf03183600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/1998] [Indexed: 10/19/2022]
Abstract
The flies of genusGlossina (Diptera: Glossinidae) are an important vector of African trypanosomiases which cause diseases in humans and animals. The ribosomal DNA Internal Transcribed Spacer-2 (ITS-2) region sequences from differentGlossina species were PCR-amplified and analyzed in order to construct a molecular phylogeny for genusGlossina. Trees generated by parsimony confirmed the monophyletic taxonomic placement of genusGlossina wherefusca group species formed the deepest branch followed bymorsitans andpalpalis groups, respectively. The placement ofGlossina austeni by both the traditional morphological and biochemical criteria has been controversial. Results presented here, based on ITS-2 locus sequence analysis, suggest thatGlossina austeni can be placed into a separate subgenerus which forms a sister-group relationship with themorsitans group species.
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2431
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Huang Y, Chen X, Chen N, Nie L, Xu M, Zhou Q. Expression and prognostic significance of survivin splice variants in diffusely infiltrating astrocytoma. J Clin Pathol 2011; 64:953-9. [DOI: 10.1136/jclinpath-2011-200066] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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2432
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Ma C, Cvetkovic D, Chen X, Chen L. WE-E-220-05: On-Thermal Pulsed Focused Ultrasound for Cancer Therapy. Med Phys 2011. [DOI: 10.1118/1.3613400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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2433
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Hong Y, Yang D, Liu W, Zhao X, Chen X, Li L. Dyslipidemia in relation to body mass index and insulin resistance in Chinese women with polycystic ovary syndrome. J BIOL REG HOMEOS AG 2011; 25:365-374. [PMID: 22023761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Dyslipidemia is a common metabolic disorder in women with polycystic ovary syndrome (PCOS) and has been reported to be different in PCOS sufferers from various ethnic and geographic backgrounds. This study aims to investigate the prevalence of dyslipidemia in Chinese women with PCOS and its relationship to body mass index (BMI) and insulin resistance (IR). In this paper, a retrospective study was performed on 507 PCOS patients and 1246 age- and BMI-matched controls. Anthropometric indices of hormonal, adiposity, and metabolic variables were measured. All patients were divided into subgroups according to BMI and the homeostasis model assessment (HOMA) values. Accordingly, the prevalence of IR was 38.1 percent in our subjects. We found that mean fasting total triglyceride, low density lipoprotein (LDL) cholesterol and total cholesterol levels were significantly higher and the mean high density lipoprotein (HDL) cholesterol level was significantly lower in the IR group than in the non-IR (NIR) group. The prevalence of dyslipidemia was 24.7 percent in PCOS patients and the prevalence of dyslipidemia was significantly higher in the IR group than in the NIR group (39.9 percent vs 15.3 percent, P<0.05). The HOMA index was found to be positively correlated with TG, TC and LDL, and negatively correlated with HDL. TG and HDL levels remained significantly correlated with HOMA even after adjustment for BMI. Generally, the prevalence of various patterns of dyslipidemia in PCOS patients increased with HOMA value. In conclusion, the prevalence of IR and dyslipidemia were both found to be high in PCOS women in our study, although no higher than other ethnicities. Lipid abnormality was demonstrated to be associated with IR and BMI in Chinese PCOS women. We speculate that insulin sensitizer might ameliorate dyslipidemia through improving IR in PCOS women.
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2434
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Chen X, Min L, Ye Y, Zhang Q. PL-006 HBV infection modeling and numerical simulation for anti-HBV infection personalized combination therapy. Int J Infect Dis 2011. [DOI: 10.1016/s1201-9712(11)60101-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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2435
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Chen X, Jiang N, Wang B. O1-S10.06 HIV/STI prevalence among men who have sex with men in 4 cities, China and associated risk factors for HIV infection. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050109.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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2436
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Chen X, Shearer PM, Walter F, Fricker HA. Seventeen Antarctic seismic events detected by global surface waves and a possible link to calving events from satellite images. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jb008262] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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2437
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Zhao L, Jiao Q, Yang P, Chen X, Zhang J, Zhao B, Zheng P, Liu Y. Metabotropic glutamate receptor 5 promotes proliferation of human neural stem/progenitor cells with activation of mitogen-activated protein kinases signaling pathway in vitro. Neuroscience 2011; 192:185-94. [PMID: 21723923 DOI: 10.1016/j.neuroscience.2011.06.044] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 06/10/2011] [Accepted: 06/15/2011] [Indexed: 01/19/2023]
Abstract
Metabotropic glutamate receptors (mGluRs) regulate neurogenesis in brain, but the mechanisms remain unknown. In this study, we investigated the effect of mGluR5 on the proliferation of human embryonic neural stem/progenitor cells (NPCs), the expression of cyclin D1 and the activation of signaling pathways of mitogen-activated protein kinases (MAPKs). Results showed that mGluR5 agonist (S)-3,5-dihydroxyphenylglycine hydrate (DHPG) increased the proliferation of NPCs by increasing cell activity, diameter of neurospheres and cell division, while mGluR5 siRNA and antagonist 6-methyl-2-(phenylethynyl) pyridine hydrochloride (MPEP) decreased the NPC proliferation. The mRNA and protein expressions of cyclin D1 increased with DHPG treatment and decreased after siRNA or MPEP treatment. It was also found that activation of extracellular signal-regulated protein kinase (ERK) and c-Jun N-terminal protein kinase (JNK) signaling pathways were involved in the proliferation of NPCs. After DHPG treatment, p-ERK1/2 and p-JNK2 levels increased, and meanwhile p-p38 level decreased; but p-ERK1/2 and p-JNK2 levels decreased after siRNA or MPEP treatment, and p-p38 level increased. Our findings demonstrated that mGluR5 promoted the proliferation of human embryonic cortical NPCs and increased cyclin D1 expression with the changes in phosphorylation of MAPKs signaling pathways in vitro, suggesting a novel mechanism for pharmacological study of treatment for ischemic brain injury and neurodegenerative disorders.
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Chi S, Cai W, Liu P, Zhang Z, Chen X, Gao L, Qi J, Bi L, Chen L, Qi Z. Baifuzi reduces transient ischemic brain damage through an interaction with the STREX domain of BKCa channels. Cell Death Dis 2011; 1:e13. [PMID: 21364615 PMCID: PMC3039290 DOI: 10.1038/cddis.2009.10] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Stroke is a long-term disability and one of the leading causes of death. However, no successful therapeutic intervention is available for the majority of stroke patients. In this study, we explored a traditional Chinese medicine Baifuzi (Typhonium giganteum Engl.). We show, at first, that the ethanol extract of Baifuzi exerts neuroprotective effects against brain damage induced by transient global or focal cerebral ischemia in rats and mice. Second, the extract activated large-conductance Ca(2+)-activated K(+) channel (BK(Ca)) channels, and BK(Ca) channel blockade suppressed the neuroprotection of the extract, suggesting that the BK(Ca) is the molecular target of Baifuzi. Third, Baifuzi cerebroside (Baifuzi-CB), purified from its ethanol extract, activated BK(Ca) channels in a manner similar to that of the extract. Fourth, the stress axis hormone-regulated exon (STREX) domain of the BK(Ca) channel directly interacted with Baifuzi-CB, and its deletion suppressed channel activation by Baifuzi-CB. These results indicate that Baifuzi-CB activated the BK(Ca) channel through its direct interaction with the STREX domain of the channel and suggests that Baifuzi-CB merits exploration as a potential therapeutic agent for treating brain ischemia.
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Liu Y, Zhang X, Liang Y, Yu H, Chen X, Zheng T, Zheng B, Wang L, Zhao L, Shi C, Zhao S. Targeting X box-binding protein-1 (XBP1) enhances sensitivity of glioma cells to oxidative stress. Neuropathol Appl Neurobiol 2011; 37:395-405. [DOI: 10.1111/j.1365-2990.2010.01155.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2440
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Duan L, Chen X, Jiang G. Lobar torsion after video-assisted thoracoscopic lobectomy: 2 case reports. Thorac Cardiovasc Surg 2011; 60:167-9. [PMID: 21695674 DOI: 10.1055/s-0030-1271182] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Lung torsion is a rare but potentially lethal complication after pulmonary resection. We report two cases of right middle lobar torsion after video-assisted thoracoscopic (VATS) right upper lobectomy in our unit. The two cases were diagnosed definitely 7 and 14 days after VATS surgery by computed tomography (CT) scan and bronchoscopy, respectively. Rethoracotomy and right middle lobectomy were performed in both patients. VATS lobectomy contributes to the development of lobar torsion so this complication should be considered. Carefully checking anatomical structures before thoracotomic closure and correctly suturing the middle lobe to the consecutive lobe are effective ways to prevent this complication.
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2441
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Song CL, Wang YL, Cheng P, Jiang YP, Li W, Zhang T, Li Z, He K, Wang L, Jia JF, Hung HH, Wu C, Ma X, Chen X, Xue QK. Direct Observation of Nodes and Twofold Symmetry in FeSe Superconductor. Science 2011; 332:1410-3. [DOI: 10.1126/science.1202226] [Citation(s) in RCA: 333] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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2442
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Cheng JP, Ma R, Chen X, Shi D, Liu F, Zhang XB. Effect of ferric ions on the morphology and size of magnetite nanocrystals synthesized by ultrasonic irradiation. CRYSTAL RESEARCH AND TECHNOLOGY 2011. [DOI: 10.1002/crat.201100144] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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2443
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Chen X, Griffin R, Webber J, Corry P, Shafirstein G, Moros E. WE-E-220-04: Focused Ultrasound Ablation of Tumour Hypoxic Tissue of Small Animals under PET and MRI Guidance. Med Phys 2011. [DOI: 10.1118/1.3613399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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2444
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Chen X, Cvetkovic D, Chen L, Ma C. WE-G-220-07: Treatment Assessment for Pulsed Focused Ultrasound Therapy of Prostate Tumor Using a Clinical 1.5T MRI. Med Phys 2011. [DOI: 10.1118/1.3613456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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2445
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Fitzpatrick M, Vazquez-Quino L, Alkhatib H, Chen X, Shi C, Papanikolaou N. SU-E-T-472: Arc Therapy Dose Reconstruction Using an A-Si EPID-Based System. Med Phys 2011. [DOI: 10.1118/1.3612426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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2446
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Chao M, Huang J, Chen X, Yan Y, Xie Y, Boyd K, Moros E. SU-E-T-802: Dosimetric Examination and Verification of Megavoltage Computed Tomography (MVCT) Based IMRT Treatment Planning with Helical TomoTherapy. Med Phys 2011. [DOI: 10.1118/1.3612766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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2447
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Webb PM, Ibiebele TI, Hughes MC, Beesley J, van der Pols JC, Chen X, Nagle CM, Bain CJ, Chenevix-Trench G. Folate and related micronutrients, folate-metabolising genes and risk of ovarian cancer. Eur J Clin Nutr 2011; 65:1133-40. [PMID: 21629268 DOI: 10.1038/ejcn.2011.99] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND/OBJECTIVE Folates are essential for DNA synthesis and methylation, and thus may have a role in carcinogenesis. Limited evidence suggests folate-containing foods might protect against some cancers and may partially mitigate the increased risk of breast cancer associated with alcohol intake, but there is little information regarding ovarian cancer. Our aim was to evaluate the role of folate and related micronutrients, polymorphisms in key folate-metabolising genes and environmental factors in ovarian carcinogenesis. SUBJECTS/METHODS Participants in the Australian Ovarian Cancer Study (1363 cases, 1414 controls) self-completed risk factor and food-frequency questionnaires. DNA samples (1638 cases, 1278 controls) were genotyped for 49 tag single-nucleotide polymorphisms (SNPs) in the methylene tetrahydrofolate reductase (MTHFR), methionine synthase (MTR) and MTR reductase (MTRR) genes. Logistic regression models were used to generate adjusted odds ratios and 95% confidence intervals. RESULTS We saw no overall association between the intake of folate, B vitamins or other methyl donors and ovarian cancer risk, although increasing folate from foods was associated with reduced risk among current smokers (P(trend)=0.03) and folic acid intake was associated with borderline significant increased risks among women who consumed ≥1 standard alcoholic drinks/day (odds ratio (OR)=1.64; 95% confidence interval (CI) 1.05-2.54, P(trend)=0.05). Two SNPs (rs7365052, rs7526063) showed borderline significant inverse associations with ovarian cancer risk; both had very low minor allele frequencies. There was little evidence for interaction between genotype and micronutrient intake or for variation between different histological subtypes of ovarian cancer. CONCLUSIONS Our data provide little evidence to support a protective role for folate in ovarian carcinogenesis but suggest further evaluation of the joint effects of folic acid and alcohol is warranted.
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Xue J, Liu H, Chen X, Lin M, Dong Z, Wang L, Chen L, Ma C. SU-E-T-277: Image-Guided Radiation Therapy: The Accuracy of CT-MR Fusion for Prostate Treatment Planning. Med Phys 2011. [DOI: 10.1118/1.3612228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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2449
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Chen L, Mu Z, Chen X, Cvetkovic D, Pollack A, Ma C. SU-E-U-01: MR Guided Pulsed High Intensity Focused Ultrasound Enhancement of Chemotherapy for Prostate Cancer. Med Phys 2011. [DOI: 10.1118/1.3612862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Chen X, Chao M, Penagaricano J, Yan Y, Corry P, Ratanatharathorn V, Moros E. SU-E-T-848: Dose Mass - Based IMRT Inverse Planning for Radiotherapy of Thoracic Cancer. Med Phys 2011. [DOI: 10.1118/1.3612812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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