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Gong P, Yang Y, Lei W, Feng Y, Li S, Peng X, Gong Y. SMARCE1Promotes Chicken EmbryonicGonad Development by RegulatingERa andARExpression. Sex Dev 2012; 6:178-87. [DOI: 10.1159/000338471] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/13/2012] [Indexed: 11/19/2022] Open
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Gong Y, Ye Y, Zhao Y, Caulloo S, Chen X, Zhang B, Cai Z, Zhang X. Severe diffuse non-scarring hair loss in systemic lupus erythematosus - clinical and histopathological analysis of four cases. J Eur Acad Dermatol Venereol 2011; 27:651-4. [PMID: 22176340 DOI: 10.1111/j.1468-3083.2011.04388.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Although diffuse non-scarring hair loss been found common in systemic lupus erythematosus (SLE), study that conduted on the severe type has been scarce. OBJECTIVE This study aims to explore the dermoscopic and pathological features of severe diffuse hair loss in SLE. METHOD Data including clinico-laboratory, dermoscopic and histopathological findings of four patients with SLE with severe diffuse hair loss were analysed retrospectively. RESULTS All four patients were women aged 41, 39, 14 and 48 with complaints of hair loss involving 55%, 100%, 60% and 55% of their scalp respectively. Common clinical findings observed in the patients were sparse scalp hair with clusters of newly regrown hair. Scalp dermoscopy showed scaling, perifollicular telangiectasia, increased numbers of short vellus hairs, focal atrichia and decreased hair shaft pigmentation. Scalp tissue histopathology revealed typical changes of SLE such as epidermal atrophy with focal liquefaction, degeneration of the basement membrane zone, pigment incontinence, mild focal perivascular and perifollicular lymphocytic infiltrates and deposition of immunoglobulins at the dermal-epidermal junction. Treatment and improvement in SLE disease activity indices had a favourable impact on hair regrowth. CONCLUSION The severe type of hair loss in patient with SLE presents a unique set of clinical, dermoscopic and histopathological features.
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Wang X, Saso H, Iwamoto T, Pusztai L, Gong Y, Woodward WA, Reuben JM, Hortobagyi GN, Ueno NT. P2-02-01: A Novel Inflammatory Breast Cancer-Specific Oncogene, Tazarotene-Induced Gene 1, Promotes Tumorigenicity and Invasiveness through the Receptor Tyrosine Kinase Axl. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p2-02-01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Inflammatory breast cancer (IBC) is the most lethal and aggressive form of breast cancer and is highly metastatic. The prognosis of patients with IBC is poor, and effective standard therapies for IBC are limited because the molecular mechanisms underlying the pathogenesis of IBC remain unknown. We recently found that tazarotene-induced gene 1 (TIG1) expression is significantly higher in IBC cell lines than in non-IBC cell lines. In both IBC and non-IBC data sets, estrogen receptor-negative/HER2−negative samples had significantly higher expression of TIG1 than did other clinical subtypes (estrogen receptor-positive/HER2−negative and HER2−positive). Therefore, we hypothesized that TIG1 plays an important role in the malignant process of IBC. In these studies, we determined the biological function of TIG1 in IBC cells and elucidated the molecular mechanism by which TIG1 regulates the invasiveness of IBC cells.
Methods: TIG1 expression in SUM149 and KPL-4 IBC cells was stably knocked down, and the effects of this knockdown on in vitro cell proliferation, migration, and invasion were analyzed. The effects of restoring TIG1 expression on TIG1-silencing IBC cells were also examined. To determine the tumorigenic activity of TIG1 in vivo, TIG1 stable-knockdown SUM149 cells and control shRNA-transfected cells were implanted into the mammary fat pads of athymic nude mice, and tumor growth was monitored. The receptor tyrosine kinase Axl, a potential functional partner of TIG1, was identified using DNA microarray analysis. The interaction between TIG1 and Axl in IBC cells was examined using immunoprecipitation and confocal microscopy assays. The signaling pathway in IBC cells in which TIG1 participates was also investigated.
Results: Knockdown of TIG1 expression in IBC cells reduced their proliferation, migration, and invasion in vitro. Also, silencing of TIG1 dramatically inhibited IBC tumor growth in a xenograft model. Moreover, restoring TIG1 expression rescued the proliferation, motility, and invasiveness of TIG1-silenced IBC cells. Most importantly, we identified Axl as a functional partner of TIG1 by showing that TIG1 interacted with and stabilized Axl in IBC cells. TIG1 regulated the invasiveness of IBC cells through mediation of the Axl signaling pathway. In SUM149 cells, TIG1 depletion decreased Axl expression, which led to downregulation of expression of matrix metalloproteinase-9, a molecule required for Axl-mediated invasion, and inactivation of nuclear factor-kB, ultimately leading to decreased invasiveness of IBC cells.
Conclusion: Our results identified TIG1 as an oncogenic gene that contributes to the tumorigenic and metastatic properties of IBC. Our data also linked TIG1 with the key tumorigenic gene Axl in IBC cells. Further studies designed to establish TIG1 as a therapeutic target in the treatment of patients with IBC are under way.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P2-02-01.
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Zheng B, Zhou R, Gong Y, Yang X, Shan Q. Proteasome inhibitor bortezomib overcomes P-gp-mediated multidrug resistance in resistant leukemic cell lines. Int J Lab Hematol 2011; 34:237-47. [PMID: 22145750 DOI: 10.1111/j.1751-553x.2011.01384.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION To study the effect of bortezomib alone or in combination with daunorubicin (DNR) on an mdr1 single-factor drug-resistant leukemia cell line K562/MDR1, a multifactor-resistant cell line K562/A02, a drug-sensitive cell line K562, and primary cells from acute myeloid leukemia patients. METHODS The cell lines were exposed to bortezomib, DNR, and bortezomib plus DNR, and cell proliferation, cell cycle, apoptosis rate, and expression of MDR1/BCL2 were analyzed. RESULTS Bortezomib potently inhibited growth and increased the apoptosis rate in the cell lines. In K562/MDR1 and K562/A02, the calcium channel blocker verapamil reduced the 50% inhibitory concentration and apoptosis rate of DNR, a P-gp protein substrate, but not of bortezomib. Bortezomib plus DNR had synergistic effect on antiproliferation (synergistic ratio > 1). Apoptosis was substantially more increased by the combination of two drugs than by bortezomib alone. Bortezomib arrested the cell cycles of three cell lines at the G2/M stage, decreased BCL2 mRNA expression, but did not affect MDR1 mRNA levels. The antiproliferative role of bortezomib was also confirmed in primary leukemia cells. CONCLUSION Bortezomib is a promising potential therapy for acute leukemia, especially mdr1 drug-resistant leukemia.
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Zheng JL, Luo Z, Chen QL, Liu X, Liu CX, Zhao YH, Gong Y. Effect of waterborne zinc exposure on metal accumulation, enzymatic activities and histology of Synechogobius hasta. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2011; 74:1864-1873. [PMID: 21764133 DOI: 10.1016/j.ecoenv.2011.06.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 06/18/2011] [Accepted: 06/26/2011] [Indexed: 05/31/2023]
Abstract
The present study was conducted to determine the metal accumulation, antioxidant enzymatic response, hepatic intermediary metabolism and histological changes in Synechogobius hasta exposed to 0.35 (control), 9.7 and 19.2mg/L Zn, respectively, on the 0, 4th, 8th and 12th day. Waterborne Zn exposure significantly reduced hepatosomatic index, hepatic lipid contents and fatty liver occurrence rate, increased Zn, Fe and Mn contents and reduced the contents of Cu and Ca in liver, and increased muscle Zn content. Waterborne Zn exposure also significantly influenced enzymatic activities involved in antioxidant responses (superoxide dismutase, catalase, glutathione-S-transferase, malondialdehyde) in liver and spleen, and changed hepatic intermediary enzymatic activities (succinate dehydrogenase, malic dehydrogenase, lactate dehydrogenase, lipoprotein lipase, hepatic lipase), impaired the histological structure of the gill and spleen, and reduced vacuolated hepatocytes. Thus, our study demonstrated for the first time that waterborne Zn exposure could reduce fatty liver syndrome in S. hasta.
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Xiao C, Gong Y, Han E, Gonzalez-Angulo A, Sneige N. Stability of HER2-positive status in breast carcinoma: a comparison between primary and paired metastatic tumors with regard to the possible impact of intervening trastuzumab treatment. Ann Oncol 2011; 22:1547-1553. [DOI: 10.1093/annonc/mdq623] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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Zhang X, Ren L, Gong Y, Huang M, Zhou L, Zhu J, Ding Z, Hou M, Lu Y. Monitoring of the estimated glomerular filtration rate (eGFR) in patients with small cell lung cancer during chemotherapy: Equations based on serum creatinine or cystatin C? J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e19741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Bao P, Wu C, Gu K, Wang C, Huang Z, Peng P, Gong Y, Xiang Y, Dong W, Lu W, Zheng Y. Mortality trends in female breast cancer from 1973 to 2007 in urban Shanghai. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e12015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Niikura N, Liu J, Hayashi N, Mittendorf EA, Gong Y, Palla SL, Tokuda Y, Gonzalez-Angulo AM, Hortobagyi GN, Ueno NT. Clinical significance of metastatic-tumor HER2 status in patients with HER2-positive primary breast cancer. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Wu C, Bao P, Zheng Y, Gu K, Wang C, Huang Z, Peng P, Gong Y, Xiang Y, Dong W, Lu W. Survival in gastric cancer: A population-based cancer registry among residents in Shanghai, China. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e12014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Wang C, Liang Z, Liang Z, Yu W, Yu W, Feng Y, Feng Y, Peng X, Peng X, Gong Y, Gong Y, Li S, Li S. Polymorphism of the prolactin gene and its association with egg production traits in native Chinese ducks. S AFR J ANIM SCI 2011. [DOI: 10.4314/sajas.v41i1.66044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Li Z, Xu L, Peng C, Kuang H, Xu C, Wang L, Xue F, Ding T, Sheng C, Gong Y. Simultaneous Determination of Nine Types of Phthalate Residues in Commercial Milk Products Using HPLC-ESI-MS-MS. J Chromatogr Sci 2011; 49:338-43. [DOI: 10.1093/chrsci/49.4.337] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Wang XD, Lou HB, Gong Y, Vainio U, Jiang JZ. Heterogeneities in CuZr-based bulk metallic glasses studied by x-ray scattering. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:075402. [PMID: 21411883 DOI: 10.1088/0953-8984/23/7/075402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Inhomogeneities in two CuZr-based bulk metallic glasses (BMGs) were studied by using synchrotron radiation x-ray scattering techniques. (Cu(4.5/5.5)Ag(1/5.5))(46)Zr(46)Al(8) BMG was found to be more inhomogeneous than Cu(46)Zr(46)Al(8) BMG on the small length scale, where Cu and Ag atoms form enriched zones. Such heterogeneities are locally favorable for forming close-packed icosahedron-like clusters in three-dimensional space, greatly promoting the glass forming ability of this alloy. Upon annealing near the T(g) temperature, the heterogeneities were reduced initially at low temperature and short time annealing, then regenerated again for temperature increase and time extension. The average environment around Zr atoms almost does not change. However, the heterogeneity increases for Cu, Zr and Ag atoms once nanocrystallization happens.
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Gong Y, Zhou L, Shi X, Ma Z, Guo Z, Wang M, Wang J, Li X. Chemical Composition of the Fruit Essential Oil of Phellodendron chinense(Rutaceae) from China and Its Antifungal Activity against Plant Pathogenic Fungi. JOURNAL OF ESSENTIAL OIL RESEARCH 2011. [DOI: 10.1080/10412905.2011.9700436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Symmans WF, Hatzis C, Valero V, Booser DJ, Esserman L, Martin M, Vidaurre T, Holmes F, Souchon EA, Lluch A, Cotrina J, Gomez H, Hubbard R, Ferrer-Lozano J, Dyer R, Buxton M, Gong Y, Wu Y, Ibrahim N, Andreopoulou E, Ueno NT, Hunt K, Yang W, Nazario A, DeMichele A, O'Shaughnessy J, Hortobagyi GN, Pusztai L. M. Abstract PD07-03: A Genomic Predictor of Survival Following Taxane-Anthracycline Chemotherapy for Breast Cancer. Cancer Res 2010. [DOI: 10.1158/0008-5472.sabcs10-pd07-03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: There is currently no predictive assay for patients with clinical Stage II-III breast cancer from which predicted sensitivity to treatment is associated with high probability of survival following chemotherapy.
Patients & Methods: We performed Affymetrix gene expression microarrays of prospectively collected tumor biopsies from 508 patients with newly diagnosed HER2-normal invasive breast cancer prior to neoadjuvant taxane-anthracycline chemotherapy followed by adjuvant endocrine therapy (if hormone receptor-positive). The predictor was developed from 310 samples (from MDACC & I-SPY) by combining: 1) a signature to predict sensitivity to endocrine therapy (SET); 2) estrogen receptor (ER)-stratified predictive signatures of resistance to chemotherapy, defined as extensive residual cancer burden (RCB-III) or relapse within 3 years; and 3) ER-stratified predictive signatures of response to chemotherapy, defined as pathologic complete response (pCR) or minimal RCB (RCB-I). The predictor classified tumors as treatment sensitive if high or intermediate SET, or if predicted to be responsive (and not resistant) to chemotherapy. Otherwise, tumors were classified as treatment insensitive. The predictor was then tested on an independent cohort (N= 198, 98% with clinical Stage II-III) who received neoadjuvant (N= 180) or adjuvant (N= 18) taxane-anthracycline chemotherapy (from MDACC, USO, GEICAM, Peru, LBJ). Distant relapse-free survival (DRFS) was evaluated at a 3-year median follow up using negative predictive value (NPV, absence of event if predicted to be sensitive), and absolute risk reduction (ARR) for those predicted to be sensitive (versus insensitive), with 95% confidence interval (CI). The independent predictive value was assessed in multivariate Cox regression analysis based on the likelihood ratio test (P≥0.05). Results: Patients in the independent validation cohort who were predicted to be treatment sensitive (28%) had excellent DRFS, with NPV 92% (CI 85-100) and significant absolute risk reduction (ARR 18%, CI 6-28) at 3 years, compared to those predicted to be insensitive. This was similar to the DRFS observed in patients who achieved pCR after they completed neoadjuvant chemotherapy (NPV 93%, CI 85-100). Predictions were accurate in each phenotypic subset: ER+/HER2- (30% predicted sensitive, NPV 97%, CI 91-100; ARR 11%, CI 0.1-21) and ER-/HER2- (26% predicted sensitive, NPV 83%, CI 68-100; ARR 26%, CI 4-28). Predicted treatment sensitivity (HR 0.20, CI 0.07-0.57), ER+ status (HR 0.32, CI 0.17-0.63), clinical tumor stage T3-4 (HR 2.04, CI 1.07-3.88) and age >50 (HR 0.50, CI 0.25-0.98) were significant in a multivariate model that also included clinical nodal status, grade, and type of taxane used.
Conclusion: We report validation results for the first molecular predictor of sensitivity to neoadjuvant/adjuvant systemic therapy for clinical Stage II-III breast cancer that is independently associated with excellent DRFS in those predicted to be sensitive. Predictions were accurate for both ER+/HER2- and ER-/HER2- invasive breast cancer.
Citation Information: Cancer Res 2010;70(24 Suppl):Abstract nr PD07-03.
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Wei Y, Gong K, Zheng Z, Liu L, Wang A, Zhang L, Ao Q, Gong Y, Zhang X. Schwann-like cell differentiation of rat adipose-derived stem cells by indirect co-culture with Schwann cells in vitro. Cell Prolif 2010; 43:606-16. [PMID: 21039999 DOI: 10.1111/j.1365-2184.2010.00710.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVES Schwann cell (SC) transplantation is a promising therapy for peripheral nerve transaction, however, clinical use of SCs is limited due to their very limited availability. Adipose-derived stem cells (ADSCs) have been identified as an alternative source of adult stem cells in recent years. The aim of this study was to evaluate the feasibility of using ADSCs as a source of stem cells for differentiation into Schwann-like cells by an indirect co-culture approach, in vitro. MATERIALS AND METHODS Multilineage differentiation potential of the obtained ADSCs was assayed by testing their ability to differentiate into osteoblasts and adipocytes. The ADSCs were co-cultured with SCs to be induced into Schwann-like cells through proximity, using a Millicell system. Expression of typical SC markers S-100, GFAP and P75NTR of the treated ADSCs was determined by immunocytochemical staining, western blotting and RT-PCR. Myelination capacity of the differentiated ADSCs (dADSCs) was evaluated in dADSC/dorsal root ganglia neuron (DRGN) co-cultures. RESULTS The treated ADSCs adopted a spindle shaped-like morphology after co-cultured with SCs for 6 days. All results of immunocytochemical staining, western blotting and RT-PCR showed that the treated cells expressed S-100, GFAP and P75NTR, indications of differentiation. dADSCs could form Schwann-like cell myelin in co-culture with DRGNs. Undifferentiated ADSCs (uADSCs) did not form myelin compared to DRGNs cultured alone, but could produce neurite extension. CONCLUSIONS These results demonstrate that this indirect co-culture microenvironment could induce ADSCs to differentiate into Schwann-like cells in vitro, which may be beneficial for treatment of peripheral nerve injuries in the near future.
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Zhou L, Liu J, Gong Y, Liu R, Zou B, Bai S, Xiao J, Li T, Huang M, Lu Y. Efficacy and Toxicity of Whole Brain Radiotherapy plus Simultaneous Image Guided Intensity Modulation Radiotherapy Boost for Brain Metastases of NSCLC. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Xing H, Liu T, Meng W, Gong Y. An investigation of reversal of imatinib resistance in the Bcr-Abl positive imatinib-resistant cell line K562r by dasatinib, nilotinib, rapamycin and bortezomib. Int J Lab Hematol 2010; 33:176-81. [PMID: 20942869 DOI: 10.1111/j.1751-553x.2010.01267.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION We investigated the second-generation tyrosine kinase inhibitors, dasatinib and nilotinib, for their potential to overcome resistance in the imatinib-resistant K562 cell line, and evaluated whether rapamycin, an mammalian target of rapamycin (mTOR) inhibitor, and bortezomib, a proteasome inhibitor, could increase imatinib sensitivity in resistant cell lines. METHODS Cell lines, including K562 (chronic myeloid leukaemia in blast crisis) and K562r (imatinib-resistant K562), were exposed to dasatinib, nilotinib, rapamycin, bortezomib, and rapamycin plus imatinib. Cell proliferation was measured by 3-[4, 5-dimethylthia-zol-2-yl]-2, 5-diphenyl tetrazolium bromide (MTT) assay and mTOR signaling pathways were assessed by Western blotting. RESULTS Dasatinib, nilotinib, and bortezomib inhibited proliferation of K562 and K562r cell lines at nm concentrations. Resistance of K562r due to duplication of autophosphorylation of wild-type Bcr-Abl was not overcome by dasatinib and nilotinib, but was sensitive to bortezomib. Rapamycin partially inhibited proliferation of K562 and K562r cell lines. Rapamycin plus imatinib did not have a more inhibitory effect on the proliferation of K562 and K562r cell lines. CONCLUSION K562r due to duplication of autophosphorylation of wild-type Bcr-Abl induced by imatinib was still partially resistant to dasatinib and nilotinib, but this was overcome by incremental dosing. Rapamycin did not enhance imatinib sensitivity. The blockade of the ubiquitin-proteasome pathway could be effective in overcoming resistance in the K562r imatinib-resistant cell line.
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Bakalova S, Gong Y, Cobet C, Esser N, Zhang Y, Edgar JH, Zhang Y, Dudley M, Kuball M. Electronic excitations in B12As2 and their temperature dependence by vacuum ultraviolet ellipsometry. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:395801. [PMID: 21403232 DOI: 10.1088/0953-8984/22/39/395801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The dielectric response function of epitaxial B(12)As(2) films on 4H-SiC was determined at room temperature and at 10 K in the spectral region of 3.6-9.8 eV, i.e., in the vacuum ultraviolet (VUV) spectral region, by synchrotron ellipsometry. The experimental dielectric function was simulated with the critical point parabolic band model. The parameters of the dispersive structures were derived by numerical fitting of the experimental data to the proposed model. New high energy optical transitions are resolved at 5.95, 7.8 and 8.82 eV and their lineshape and origin are discussed. The temperature dependence of the critical point energies and transition strengths was determined, and the excitonic effect is considered.
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Zeng QS, Fang YZ, Lou HB, Gong Y, Wang XD, Yang K, Li AG, Yan S, Lathe C, Wu FM, Yu XH, Jiang JZ. Low-density to high-density transition in Ce75Al23Si2 metallic glass. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:375404. [PMID: 21403196 DOI: 10.1088/0953-8984/22/37/375404] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Using in situ high-pressure x-ray diffraction (XRD), we observed a pressure-induced polyamorphic transition from the low-density amorphous (LDA) state to the high-density amorphous (HDA) state in Ce(75)Al(23)Si(2) metallic glass at about 2 GPa and 300 K. The thermal stabilities of both LDA and HDA metallic glasses were further investigated using in situ high-temperature and high-pressure XRD, which revealed different pressure dependences of the onset crystallization temperature (T(x)) between them with a turning point at about 2 GPa. Compared with Ce(75)Al(25) metallic glass, minor Si doping shifts the onset polyamorphic transition pressure from 1.5 to 2 GPa and obviously stabilizes both LDA and HDA metallic glasses with higher T(x) and changes their slopes dT(x)/dP. The results obtained in this work reveal another polyamorphous metallic glass system by minor alloying (e.g. Si), which could modify the transition pressure and also properties of LDA and HDA metallic glasses. The minor alloying effect reported here is valuable for the development of more polyamorphous metallic glasses, even multicomponent bulk metallic glasses with modified properties, which will trigger more investigations in this field and improve our understanding of polyamorphism and metallic glasses.
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Zhang X, Gong Y, Wu F, Deng N, Pozdnyakov IP, Glebov EM, Grivin VP, Plyusnin VF, Bazhinb NM. Photochemistry of the iron(III) complex with pyruvic acid in aqueous solutions. Russ Chem Bull 2010. [DOI: 10.1007/s11172-009-0249-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Zhao B, Abdelmoudjib G, Li J, Li H, Wei C, Gong Y, Liu Q. Two polymorphisms in the TIM-4 gene are associated with asthma in a Chinese Han population. Int J Immunogenet 2010; 38:31-5. [PMID: 20727045 DOI: 10.1111/j.1744-313x.2010.00965.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The gene family of the T cell immunoglobulin and mucin domain (TIM) proteins encodes cell surface receptors that are involved in the regulation of Th1- and Th2-cell-mediated immunity. TIM-1 gene has been found to be associated with asthma in several populations. TIM-4, the natural ligand for TIM-1, may influence the susceptility to asthma.To investigate the association of the TIM-4 gene polymorphisms with asthma in a Chinese Han population. Three single nucleotide polymorphisms (SNPs) in TIM-4 gene, rs6882076, rs12658558 and rs4702747, were genotyped in 551 unrelated asthma patients and 549 healthy controls. We found that two SNPs of the TIM-4 gene, rs6882076 and rs4702747, were associated with asthma susceptibility in our study population (with P-values = 0.009 and 0.005 respectively). No association was observed between asthma and rs12658558. Our results suggest that TIM-4 gene polymorphisms are associated with asthma in a Chinese Han population.
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Xu Z, Jin C, Wang Z, Deng H, Shen D, Zhang M, Li M, Wang J, Zheng Z, Gong Y. A prospective, randomized, controlled, multicenter trial of Chinese herbs by stages combined with chemotherapy for advanced non-small cell lung cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e18000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Gong Y, Cabodi M, Porter T. Relationship between size and frequency dependent attenuation of monodisperse populations of lipid coated microbubbles. ACTA ACUST UNITED AC 2010. [DOI: 10.1179/1758897910y.0000000002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Gong Y, Yi M, Fediuk J, Lizotte PP, Dakshinamurti S. Hypoxic neonatal pulmonary arterial myocytes are sensitized to ROS-generated 8-isoprostane. Free Radic Biol Med 2010; 48:882-94. [PMID: 20079425 DOI: 10.1016/j.freeradbiomed.2010.01.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Revised: 12/11/2009] [Accepted: 01/05/2010] [Indexed: 10/20/2022]
Abstract
8-Isoprostane, a ROS-derived prostanoid that acts via the thromboxane receptor (TP), is implicated in neonatal pulmonary hypertension. The purpose of this study was to examine the effect of hypoxia on vascular smooth muscle ROS generation, 8-isoprostane activity, and TP binding. First-passage neonatal porcine pulmonary artery myocytes were exposed to 10% O(2) (hypoxic myocytes; HM) or 21% O(2) (normoxic myocytes) for 72 h. Hypoxia increased in vitro generation of ROS, superoxide, and 8-isoprostane. ROS generation was ablated by inhibition of mitochondrial complex III. SOD1 and 3 activities were increased, but SOD2 activity decreased by 45% in HM. 8-Isoprostane generation was driven by the addition of peroxide and nitric oxide; incubation with permeative PEG-SOD, but not PEG-catalase or impermeative SOD, attenuated hypoxia-induced 8-isoprostane generation. 8-Isoprostane affinity for TP was markedly increased in HM. Myocyte 8-isoprostane challenge caused TP internalization and calcium release only in HM; this was sensitive to TP blockade and was normalized by activation of adenylyl cyclase. We propose that hypoxia induces superoxide accumulation in pulmonary artery myocytes through inhibition of mitochondrial SOD2 activity, promoting peroxynitrite-induced generation of 8-isoprostane. 8-Isoprostane binds to sensitized TP receptors, causing receptor internalization and signaling to calcium release in hypoxic myocytes. 8-Isoprostane may be an important pulmonary vasoconstrictor during neonatal hypoxia.
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