276
|
Su Y, Zhitomirsky I. Cataphoretic assembly of cationic dyes and deposition of carbon nanotube and graphene films. J Colloid Interface Sci 2013; 399:46-53. [DOI: 10.1016/j.jcis.2013.02.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Revised: 02/22/2013] [Accepted: 02/24/2013] [Indexed: 11/29/2022]
|
277
|
Yang L, Zhao Y, Su Y, Chen G. An Experimental Study of Copper Extraction Characteristics in a T-Junction Microchannel. Chem Eng Technol 2013. [DOI: 10.1002/ceat.201200464] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
278
|
Hu T, Zhang C, Tang Q, Su Y, Li B, Chen L, Zhang Z, Cai T, Zhu Y. Variant G6PD levels promote tumor cell proliferation or apoptosis via the STAT3/5 pathway in the human melanoma xenograft mouse model. BMC Cancer 2013; 13:251. [PMID: 23693134 PMCID: PMC3765728 DOI: 10.1186/1471-2407-13-251] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Accepted: 05/07/2013] [Indexed: 01/10/2023] Open
Abstract
Background Glucose-6-phosphate dehydrogenase (G6PD), elevated in tumor cells, catalyzes the first reaction in the pentose-phosphate pathway. The regulation mechanism of G6PD and pathological change in human melanoma growth remains unknown. Methods HEM (human epidermal melanocyte) cells and human melanoma cells with the wild-type G6PD gene (A375-WT), G6PD deficiency (A375-G6PD∆), G6PD cDNA overexpression (A375-G6PD∆-G6PD-WT), and mutant G6PD cDNA (A375-G6PD∆-G6PD-G487A) were subcutaneously injected into 5 groups of nude mice. Expressions of G6PD, STAT3, STAT5, cell cycle-related proteins, and apoptotic proteins as well as mechanistic exploration of STAT3/STAT5 were determined by quantitative real-time PCR (qRT-PCR), immunohistochemistry and western blot. Results Delayed formation and slowed growth were apparent in A375-G6PD∆ cells, compared to A375-WT cells. Significantly decreased G6PD expression and activity were observed in tumor tissues induced by A375-G6PD∆, along with down-regulated cell cycle proteins cyclin D1, cyclin E, p53, and S100A4. Apoptosis-inhibited factors Bcl-2 and Bcl-xl were up-regulated; however, apoptosis factor Fas was down-regulated, compared to A375-WT cells. Moderate protein expressions were observed in A375-G6PD∆-G6PD-WT and A375-G6PD∆-G6PD-G487A cells. Conclusions G6PD may regulate apoptosis and expression of cell cycle-related proteins through phosphorylation of transcription factors STAT3 and STAT5, thus mediating formation and growth of human melanoma cells. Further study will, however, be required to determine potential clinical applications.
Collapse
|
279
|
Deng D, Deng H, Zhang L, Su Y. Determination of Ephedrine and Pseudoephedrine by Field-Amplified Sample Injection Capillary Electrophoresis. J Chromatogr Sci 2013; 52:357-62. [DOI: 10.1093/chromsci/bmt039] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
280
|
Xiao W, Su Y, Zhou S, Yi C, He G, Liu Y, Qi Y. Rasgrp2 regulates the permissiveness of NIH3T3 cells to a herpes simplex virus 1 mutant with inactivated ICP34.5 gene. Acta Virol 2013; 57:41-9. [PMID: 23530823 DOI: 10.4149/av_2013_01_41] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We have previously reported that mtHSV, a herpes simplex virus 1 (HSV-1) mutant with an inactivated gene for β-galactosidase, can efficiently lyse tumor but not normal cells. However, the mechanism of this selective oncolytic activity is so far unclear. In this study, using the phage display screening we identified the cellular protein binding to HSV-1 mutant (mtHSV) as (Ras guanyl releasing protein 2) Rasgrp2 which regulates the Ras signaling pathway. Rasgrp2 was found to bind directly to purified mtHSV as well as to mtHSV present within infected HeLa cells where it aggregated on the cell membrane. NIH3T3 cells were found nonpermissive to mtHSV but they became permissive following transformation with the Rasgrp2 gene. This effect was linked to the activation of the Ras-PKR signaling pathway. These observations indicate a key role of Rasgrp2 in the mtHSV infection of NIH3T3 cells and are important for the potential use of mtHSV in cancer therapy.
Collapse
|
281
|
Han F, Yu H, Zheng T, Ma X, Zhao X, Li P, Le L, Su Y, Zheng QY. Otoprotective effects of erythropoietin on Cdh23erl/erl mice. Neuroscience 2013; 237:1-6. [PMID: 23384607 DOI: 10.1016/j.neuroscience.2013.01.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 01/18/2013] [Accepted: 01/24/2013] [Indexed: 11/30/2022]
Abstract
The Cdh23(erl/erl) mice are a novel mouse model for DFNB12 and are characterized by progressive hearing loss. In this study, erythropoietin (EPO) was given to the Cdh23(erl/erl) mice by intraperitoneal injection every other day from P7 for 7 weeks. Phosphate-buffered saline-treated or untreated Cdh23(erl/erl) mice were used as controls. Auditory-evoked brainstem response (ABR) thresholds and distortion product oto-acoustic emission (DPOAE) were measured in the mouse groups at the age of 4, 6 and 8 weeks. The results show that EPO can significantly decrease the ABR thresholds in the Cdh23(erl/erl) mice as compared with those of the untreated mice at stimulus frequencies of click, 8-, 16- and 32-kHz at three time points. Meanwhile, DPOAE amplitudes in the EPO-treated Cdh23(erl/erl) mouse group were significantly higher than those of the untreated groups at f2 frequency of 15383 Hz at the three time points. Furthermore, the mean percentage of outer hair cell loss at middle through basal turns of cochleae was significantly lower in EPO-treated Cdh23(erl/erl) mice than in the untreated mice (P<0.05). This is the first report that EPO acts as an otoprotectant in a DFNB12 mouse model with progressive hearing loss.
Collapse
|
282
|
Zhou Y, Su Y, Yang J, Watkins D, Besner G. Heparin-Binding Egf-Like Growth Factor Promotes Enteric Neurogenesis Via the Preservation of Glial Integrity After Necrotizing Enterocolitis. J Surg Res 2013. [DOI: 10.1016/j.jss.2012.10.639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
283
|
Gao Y, Lv L, Liu S, Ma G, Su Y. Elevated levels of thrombin-generating microparticles in stored red blood cells. Vox Sang 2013; 105:11-7. [PMID: 23347295 DOI: 10.1111/vox.12014] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 10/24/2012] [Accepted: 10/25/2012] [Indexed: 11/28/2022]
Abstract
BACKGROUND During storage, red blood cells (RBCs) lose their membrane stability, leading to haemolysis and microparticle (MP) formation. The use of RBCs stored for more than 28 days has been associated with an increased incidence of deep vein thrombosis. However, the exact mechanism by which coagulation activation is enhanced in stored RBCs is still unknown. OBJECTIVES To investigate the relevant potential procoagulant activities of MPs and study the relative procoagulant factors for initiating the coagulation on MPs in stored RBCs. STUDY DESIGN AND METHODS MPs were isolated from the plasma of RBC units stored in citrate-phosphate-dextrose-adenine. At seven storage time-points (d0, d7, d14, d21, d28, d35 and d42), MPs were morphologically observed, quantified and analysed for tissue factor, factor XI (FXI) and their thrombin-generating potential. RESULTS MPs were observed using electron microscopy. The size of the MPs ranged from 0·272 μm to 0·973 μm in diameter. During the storage of RBCs in plastic bags, the MP concentration increased from 3389 ± 218/μl at day 0 to 61 586 ± 2237/μl at d42. Thrombin generation was dependent on the total number of MPs (r = 0·987). Anti-human FXI antibody inhibited thrombin concentrations by 50·3% compared with control plasma, whereas antitissue factor and antitissue factor pathway inhibitor failed to reduce thrombin concentrations. CONCLUSIONS Our study provides evidence that MP formation due to RBC storage might propagate coagulation not only by exposing phosphatidylserine, but also by initiating thrombin generation independently of tissue factor in a FXI -dependent manner.
Collapse
|
284
|
Kaufmann D, Hoesch J, Su Y, Deeg L, Mellert K, Spatz JP, Kemkemer R. Partial Blindness to Submicron Topography in NF1 Haploinsufficient Cultured Fibroblasts Indicates a New Function of Neurofibromin in Regulation of Mechanosensoric. Mol Syndromol 2012; 3:169-79. [PMID: 23239959 DOI: 10.1159/000342698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/08/2012] [Indexed: 12/22/2022] Open
Abstract
Cells sense physical properties of their extracellular environment and translate them into biochemical signals. In this study, cell responses to surfaces with submicron topographies were investigated in cultured human NF1 haploinsufficient fibroblasts. Age-matched fibroblasts from 8 patients with neurofibromatosis type 1 (NF1(+/-)) and 9 controls (NF1(+/+)) were cultured on surfaces with grooves of 200 nm height and lateral distance of 2 μm. As cellular response indicator, the mean cell orientation along microstructured grooves was systematically examined. The tested NF1 haploinsufficient fibroblasts were significantly less affected by the topography than those from healthy donors. Incubation of the NF1(+/-) fibroblasts with the farnesyltransferase inhibitor FTI-277 and other inhibitors of the neurofibromin pathway ameliorates significantly the cell orientation. These data indicate that NF1 haploinsufficiency results in an altered response to specific surface topography in fibroblasts. We suggest a new function of neurofibromin in the sensoric mechanism to topographies and a partial mechanosensoric blindness by NF1 haploinsufficiency.
Collapse
|
285
|
Shannon BJ, Dosenbach RA, Su Y, Vlassenko AG, Larson-Prior LJ, Nolan TS, Snyder AZ, Raichle ME. Morning-evening variation in human brain metabolism and memory circuits. J Neurophysiol 2012. [PMID: 23197455 DOI: 10.1152/jn.00651.2012] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
It has been posited that a critical function of sleep is synaptic renormalization following a net increase in synaptic strength during wake. We hypothesized that wake would alter the resting-state functional organization of the brain and increase its metabolic cost. To test these hypotheses, two experiments were performed. In one, we obtained morning and evening resting-state functional MRI scans to assess changes in functional brain organization. In the second experiment, we obtained quantitative positron emission tomography measures of glucose and oxygen consumption to assess the cost of wake. We found selective changes in brain organization. Most prominently, bilateral medial temporal regions were locally connected in the morning but in the evening exhibited strong correlations with frontal and parietal brain regions involved in memory retrieval. We speculate that these changes may reflect aspects of memory consolidation recurring on a daily basis. Surprisingly, these changes in brain organization occurred without increases in brain metabolism.
Collapse
|
286
|
Fujita M, Zhang R, Nakata S, Kuzushima K, Wainwright DA, Balyasnikova IV, Auffinger B, Ahmed AU, Han Y, Lesniak MS, Knight A, Arnouk H, Gillespie GY, Britt W, Su Y, Lowdell MW, Lamb LS, Wang J, Leiss L, Choi BD, Kuan CT, Cai M, Bigner DD, Sampson JH, Shibahara I, Saito R, Zhang R, Kanamori M, Sonoda Y, Kumabe T, Kikuchi T, So T, Ishii N, Tominaga T, Zhang L, Wang H, Zhang I, Chen X, Da Fonseca A, Fan H, Badie B, Sayour EJ, McLendon P, Reynolds R, Bigner DD, Sampson JH, McLendon R, Mitchell DA, Sayour EJ, Sanchez-Perez L, Pham C, Snyder D, Xie W, Cui X, Bigner DD, Sampson JH, Mitchell DA, McConnell MJ, Broadley KW, Farrand K, Authier A, Brown JH, Hunn M, Hermans I, Cantini G, Pisati F, Pessina S, Finocchiaro G, Pellegatta S, Yeung JT, Hamilton R, Pollack I, Jakacki R, Okada H, Sanchez-Perez L, Choi B, Snyder D, Cui X, Schmittling RJ, Flores C, Johnson L, Archer GA, Bigner DD, Mitchell DA, Sampson JH, Raychaudhuri B, Rayman P, Huang P, Ireland J, Donnola S, Hamburdzumyan D, Finke J, Vogelbaum MA, Batich K, Snyder D, Xie W, Reap E, Archer G, Sampson J, Mitchell D, Martin AM, Nirschl C, Polanczyk M, Cohen KJ, Pardoll DM, Drake CG, Lim M, Rutledge WC, Kong J, Gao J, Gutman DA, Cooper LA, Chisolm C, Scarpace L, Mikkelsen T, Saltz JH, Moreno CS, Brat DJ, Everson RG, Lisiero DN, Soto H, Liau LM, Prins RM, Zhang L, Gonzalez GC, Chae M, Peterson TE, Parney IF, Chae M, Peterson TE, Johnson AJ, Parney IF. LAB-IMMUNOLOGY RESEARCH. Neuro Oncol 2012. [DOI: 10.1093/neuonc/nos223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
287
|
Li G, Jin H, Xin Z, Guo Y, Su Y, Sun Y. Impact of abnormal embryonic molecular karyotype determined by single nucleotide polymorphism (SNP) microarray preimplantation genetic diagnosis (PGD) on embryo development and blastocyst formation. Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
288
|
Li G, Liu Y, Hu L, Guo Y, Su Y, Sun Y. Molecular karyotype analysis of single nucleotide polymorphism microarray for early spontaneous miscarriage after assisted reproductive technology. Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
289
|
Gerstl C, Brodeck M, Schneider GJ, Su Y, Allgaier J, Arbe A, Colmenero J, Richter D. Short and Intermediate Range Order in Poly(alkylene oxide)s. A Neutron Diffraction and Molecular Dynamics Simulation Study. Macromolecules 2012. [DOI: 10.1021/ma301197y] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
290
|
Peng Y, Yang J, Zhang E, Sun H, Wang Q, Wang T, Su Y, Shi C. Human positive coactivator 4 is a potential novel therapeutic target in non-small cell lung cancer. Cancer Gene Ther 2012; 19:690-6. [PMID: 22918472 DOI: 10.1038/cgt.2012.52] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Transcriptional positive coactivator 4 (PC4) is a multifunctional nuclear protein that has important roles in DNA transcription, replication, repair and heterochromatinization. However, the role of PC4 in cancer remains to be clarified. Several studies propose that PC4 may act as a putative tumor suppressor. Here, we demonstrate for the first time that PC4 may represent a potential therapeutic target in non-small cell lung cancer (NSCLC). PC4 protein expression is significantly upregulated in NSCLC carcinoma tissues compared with their adjacent noncancerous counterparts as shown by immunohistochemical staining and western blotting in 104 pairs of formalin-fixed human NSCLC specimens and 6 fresh NSCLC samples. Knockdown of PC4 expression by sequence-specific small interfering RNA (siRNA) in human NSCLC cells (A549, H460 and H358) significantly inhibits the growth of cancer cells by the induction of cell cycle arrest and the increase of cell apoptosis in vitro. Interrupting the PC4 signaling pathway by injection of the PC4 siRNA liposome complex produced an effective regression of pre-established A549 cell xenografts in mice through growth inhibition and increased apoptosis. These results indicated that PC4 could be an attractive new therapeutic target for the treatment of NSCLC.
Collapse
|
291
|
Zhao M, Huang W, Zhang Q, Gao F, Wang L, Zhang G, Su Y, Xiao R, Zhang J, Tang M, Cheng W, Tan Y, Lu Q. Aberrant epigenetic modifications in peripheral blood mononuclear cells from patients with pemphigus vulgaris. Br J Dermatol 2012; 167:523-31. [DOI: 10.1111/j.1365-2133.2012.11007.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
292
|
Su Y, Zhitomirsky I. Electrophoretic Nanotechnology of Composite Electrodes for Electrochemical Supercapacitors. J Phys Chem B 2012; 117:1563-70. [PMID: 22662969 DOI: 10.1021/jp304358q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
293
|
Zhang J, Jiang Z, Mu X, Wen J, Su Y, Zhang L. Effect of triptolide on progesterone production from cultured rat granulosa cells. ACTA ACUST UNITED AC 2012; 62:301-6. [PMID: 22592319 DOI: 10.1055/s-0032-1309041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Triptolide(CAS 38748-32-2), a major active component of Tripterygium wilfordii Hook F (TWHF), is known to have multiple pharmacological activities. However, studies have also shown that triptolide is highly disrupt to the reproductive system by disrupting normal steroid hormone signaling. In the present study, we investigated the effect of triptolide (5, 10, or 20 nM for 24 h) on progesterone production by rat granulosa cells. Triptolide inhibited both basal and human chorionic gonadotropin (HCG)- and 8-bromo-cAMP-stimulated progesterone production as revealed by RIA assay. Furthermore, the HCG-evoked increase in cellular cAMP content was also inhibited by triptolide, indicating that disruption of the cAMP/PKA signaling pathway may mediate the deleterious effects of triptolide on progesterone regulation. In addition, triptolide inhibited 25-OH-cholesterol-stimulated progesterone production, suggesting that activity of the P450 side chain cleavage (P450scc) enzyme was also be inhibited by triptolide. Western blot and quantitative real-time PCR (qRT-PCR) assays further revealed that triptolide decreased mRNA and protein expression of P450scc and the steroidogenic regulatory (StAR) protein in granulosa cells. In contrast, cell viability tests using 3-(4,5-dimethyl-thiazol-2-yl)-2,5- diphenyl-tetrazolium bromide (MTT) indicated that triptolide did not cause measurable cell death at doses that suppressed steroidogenesis. The reproductive toxicity of triptolide may be caused by disruption of cAMP/PKA-mediated expression of a number of progesterone synthesis enzymes or regulatory proteins, leading to reduced progesterone synthesis and reproductive dysfunction.
Collapse
|
294
|
de Groot J, Marty K, Lumsden MD, Christianson AD, Nagler SE, Adiga S, Borghols WJH, Schmalzl K, Yamani Z, Bland SR, de Souza R, Staub U, Schweika W, Su Y, Angst M. Competing ferri- and antiferromagnetic phases in geometrically frustrated LuFe2O4. PHYSICAL REVIEW LETTERS 2012; 108:037206. [PMID: 22400782 DOI: 10.1103/physrevlett.108.037206] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Indexed: 05/31/2023]
Abstract
We present a detailed study of magnetism in LuFe(2)O(4), combining magnetization measurements with neutron and soft x-ray diffraction. The magnetic phase diagram in the vicinity of T(N) involves a metamagnetic transition separating an antiferro- and a ferrimagnetic phase. For both phases the spin structure is refined by neutron diffraction. Observed diffuse magnetic scattering far above T(N) is explained in terms of near degeneracy of the magnetic phases.
Collapse
|
295
|
Zhao M, Liang G, Wu X, Wang S, Zhang P, Su Y, Yin H, Tan Y, Zhang J, Lu Q. Abnormal epigenetic modifications in peripheral blood mononuclear cells from patients with alopecia areata. Br J Dermatol 2012; 166:226-73. [PMID: 21936853 DOI: 10.1111/j.1365-2133.2011.10646.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Alopecia areata (AA) is a hair loss disease caused by T-cell-mediated autoimmune reactions against anagen-stage hair follicles. Although the exact aetiology is poorly understood, there is evidence to suggest that both genetic and environmental factors are involved in AA pathogenesis. OBJECTIVES To analyse DNA methylation and histone modification patterns in peripheral blood mononuclear cells (PBMCs) of patients with AA. METHODS PBMC samples were obtained from 25 patients with AA and 20 healthy controls. Global DNA methylcytosine levels, as well as histone acetylation and methylation levels, were measured by enzyme-linked immunosorbent assay. mRNA expression levels were determined using real-time quantitative reverse transcription-polymerase chain reaction. RESULTS Genomic DNA methylation in PBMCs of patients with AA was increased relative to controls. DNMT1, MBD1 and MBD4 expression levels were significantly higher in AA PBMCs than in controls, and DNMT1 transcription levels positively correlated with global DNA methylation levels in patient samples. Histone H3 acetylation was significantly increased and histone H3 lysine 4 methylation was significantly decreased in patient PBMCs compared with healthy controls. Histone H3 acetylation levels were positively correlated with AA disease severity, and with RANTES (CCL5) mRNA expression in PBMCs of patients with AA. These changes were accompanied by increased p300 (EP300), histone deacetylase 1 (HDAC1), myeloid/lymphoid or mixed lineage leukemia (MLL), SET7/9 (SETD7), G9A (EHMT2), JMJD2C (KDM4C) and JARID1A (KDM5A) expression, as well as reduced HDAC2, HDAC7, LSD1 (KDM1A), JMJD2A (KDM4A) and JMJD2B (KDM4B) expression. CONCLUSIONS DNA methylation and histone modification status are altered in PBMCs of patients with AA, possibly due to the deregulation of epigenetic regulatory genes. These changes may contribute to the activation of pathological immune responses in AA.
Collapse
|
296
|
Kiriazis H, Jennings N, Davern P, Lambert G, Su Y, Pang T, Du X, La Greca L, Head G, Hannan A, Du X. Enhanced Parasympathetic Nervous Activity in Huntington's Disease Transgenic Mice. Heart Lung Circ 2012. [DOI: 10.1016/j.hlc.2012.05.654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
297
|
Diéras V, Bonnefoi H, Alba E, Awada A, Coudert B, Pivot X, Gligorov J, Jäger A, Gianni L, Lindeman G, Pham N, Su Y, Gao G, Mery-Mignard D, Paridaens R, Verweij J. P3-16-08: A Phase 2, Randomized Open-Label Study of Iniparib, Administered Either Weekly or Twice-Weekly in Combination with Gemcitabine Plus Carboplatin in Patients with mTNBC. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p3-16-08] [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
Iniparib (BSI-201) is an investigational anticancer agent whose precise mechanism of action is under active investigation. In breast cancer cell lines and xenograft models of triple-negative breast cancer (TNBC), iniparib exhibits anti-proliferative activity and potentiates the cell cycle effects of some DNA damaging agents. In a randomized, open-label phase 2 study in pts with metastatic TNBC (mTNBC), iniparib combined with gemcitabine (G) and carboplatin (C) (GC) improved efficacy outcomes compared with GC alone. A confirmatory phase 3 study with GCI failed to meet pre-specified criteria for PFS and OS; however, an exploratory subset analysis demonstrated a potential benefit amongst 2nd/3rd line pts (O'Shaughnessy et al. ASCO 2011). Here we report results of a randomized phase 2 study (NCT01045304) in pts with mTNBC, which assesses efficacy and pharmacokinetics (PK) of iniparib administered either biw or qw in combination with GC.
Patients and methods: Eligible pts (N=163; median age 49 yrs) had documented and measurable TNBC, ECOG PS 0–1, normal organ/marrow function, and had received ≤2 prior chemotherapy (CT) regimens for metastatic disease. Pts were randomized (1:1) to receive G (1,000 mg/m2, IV, d 1, 8) plus C (AUC 2, IV, d 1, 8) and iniparib either biw (5.6 mg/kg, IV d 1,4,8,11) or qw (11.2 mg/kg, IV d 1,8) on a 21 d cycle. Pts were stratified according to prior CT for mTNBC (0 vs. 1–2). The primary efficacy endpoint was overall response rate (ORR; CR + PR); secondary endpoints included: clinical benefit rate (CBR; CR + PR + SD for 24 weeks), PFS, OS and PK.
Results: At the time of analysis, 23% of patients were still on treatment. The median number of cycles administered per patient was 6 in both arms; exposure to iniparib was identical. Safety data are not fully validated. All pts experienced at least 1 treatment emergent adverse event (TEAE). Grade (Gr) ≥3 TEAEs occurred in 94% and 85% of pts in the biw and qw arms, respectively. TEAEs Gr ≥3 occurring in ≥5% of pts regardless of relationship to study drug (biw vs qw) are as follows: blood and lymphatic 71% vs 67%; hepatobiliary 7.5% vs 9.8%; asthenia/fatigue 7.5% vs 11%; GI 8.8% vs 8.5%; infections 7.5% vs 3.7%; respiratory, thoracic and mediastinal 5% vs 8.5%, metabolism and nutrition 4% vs 6%. For response data see table.
No major difference was observed in drug exposure (based on AUC within one cycle) between the two dosing regimens.
Conclusion: Dosing of GCI on a qw schedule produced a similar ORR to that obtained with the biw schedule. A comparable safety profile in both arms, and consistency with results of previous studies, suggests that the weekly combination of GCI may be an appropriate schedule for further studies evaluating this combination. OS and PFS data are not yet mature; updated efficacy and safety data will be presented.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P3-16-08.
Collapse
|
298
|
Su Y, Li J, Witkiewicz AK, Brennan D, Neill T, Talarico J, Radice GL. N-cadherin haploinsufficiency increases survival in a mouse model of pancreatic cancer. Oncogene 2011; 31:4484-9. [PMID: 22158044 DOI: 10.1038/onc.2011.574] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDA) is often detected at a late stage, hence the identification of new therapies that have potential to block tumor progression is critical for this lethal disease. N-cadherin upregulation has been observed in many cancers including PDA, however, a causal role for this cell adhesion receptor in disease progression has yet to be defined. The concomitant expression of oncogenic Kras(G12D) and mutant p53 (Trp53(R172H)) in the murine pancreas results in metastatic PDA that recapitulates the cognate features of human pancreatic cancer providing an excellent animal model to identify genes required for tumor progression. Here we determine the consequences of genetically manipulating N-cadherin expression in a mouse model of PDA. Remarkably, mice with reduced N-cadherin expression (that is, Ncad(-/+)) survived 25% longer (177 vs 142 days, P<0.05) than animals expressing two wild-type N-cadherin (Cdh2) alleles. The survival benefit is likely due to a cumulative effect of N-cadherin's role in different aspects of tumorigenesis including tumor-cell survival, growth, migration and invasion. Interestingly, reduced hedgehog signaling may contribute to the better prognosis for the Ncad(-/+) mice. Moreover, the matrix metalloproteinase MMP-7, associated with poor prognosis in PDA, was reduced in Ncad(-/+) tumors. Finally, Ncad(-/+) tumor cells exhibited decreased FGF-stimulated ERK1/2 activation consistent with N-cadherin's ability to promote FGFR signaling. These data support a critical role for N-cadherin in PDA and its potential prognostic value. Additionally, this study provides in vivo genetic evidence that the cell-surface protein N-cadherin represents a promising therapeutic target for the treatment of pancreatic cancer.
Collapse
|
299
|
Wang Y, Gong X, Su Y, Cui J, Shu X. Implications of QRS duration in dogs with pacing-induced heart failure. Physiol Res 2011; 60:861-8. [PMID: 21995896 DOI: 10.33549/physiolres.932152] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The objective of this study was to find out the implication of QRS duration in dogs with rapid pacing-induced heart failure. Sixteen Beagle dogs were implanted with transvenous cardiac pacemakers and underwent rapid right ventricular pacing for 3 weeks at 260 bpm to induce heart failure. Dogs were divided into two groups according to the QRS duration: 9 with normal QRS duration (<100 ms) and 7 with prolonged QRS duration (≥100 ms). Cardiac systolic function and size was analyzed by real time 3-dimensional echocardiography and left ventricular dyssynchrony was assessed by speckle tracking strain imaging. Congestive heart failure developed 3 weeks after rapid right ventricular pacing. Dogs with prolonged QRS duration showed more extensive radial strain and circumferential strain dyssynchrony than dogs with normal QRS duration. At the end of 4-week recovery, greater improvement of left ventricular ejection fraction and left ventricular end-systolic volume was detected in dogs with normal QRS duration. The findings suggested that left ventricular dyssynchrony, indicated by a prolonged QRS duration, predicted an unsatisfying recovery in dogs with rapid pacing-induced heart failure. QRS duration had the potential to be a prognostic indicator for dogs with heart failure.
Collapse
|
300
|
|