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Wolf M, Johnson R, Xie D, Avrutskaya A, Mullin R, Godfrey B, Scott I. 449 POSTER In vivo evaluation of ALB 109564, a novel tubulin inhibitor with improved efficacy over existing members of the Vinca alkaloid class. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)72383-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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102
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Xie D, Baerlocher C, McCusker L. Combining X-ray powder diffraction and electron microscopy to solve complex structures. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308093173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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103
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Xie D, Wang Z, Dong Y, Cao J, Wang J, Chen J, Chen Y. Effects of Monochromatic Light on Immune Response of Broilers. Poult Sci 2008; 87:1535-9. [DOI: 10.3382/ps.2007-00317] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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104
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Luo JH, Chen W, Sun JJ, Xie D, Mo JC, Zhou L, Lu J. Laparoscopic Management of Mullerian Duct Remnants: Four Case Reports and Review of the Literature. ACTA ACUST UNITED AC 2008; 29:638-42. [DOI: 10.2164/jandrol.108.005496] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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105
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Cao J, Liu W, Wang Z, Xie D, Jia L, Chen Y. Green and Blue Monochromatic Lights Promote Growth and Development of Broilers Via Stimulating Testosterone Secretion and Myofiber Growth. J APPL POULTRY RES 2008. [DOI: 10.3382/japr.2007-00043] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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106
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Xie D, Zhao J, Yang Y, Park J, Chu TM, Zhang JT. Preparation and evaluation of a high-strength biocompatible glass-ionomer cement for improved dental restoratives. Biomed Mater 2008; 3:025012. [DOI: 10.1088/1748-6041/3/2/025012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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107
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Tang S, Chen JM, Zhu Q, Li X, Chen M, Sun R, Zhou Y, Deng F, Xie D. LAI inversion algorithm based on directional reflectance kernels. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2007; 85:638-48. [PMID: 17129659 DOI: 10.1016/j.jenvman.2006.08.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2004] [Revised: 12/06/2005] [Accepted: 08/23/2006] [Indexed: 05/12/2023]
Abstract
Leaf area index (LAI) is an important ecological and environmental parameter. A new LAI algorithm is developed using the principles of ground LAI measurements based on canopy gap fraction. First, the relationship between LAI and gap fraction at various zenith angles is derived from the definition of LAI. Then, the directional gap fraction is acquired from a remote sensing bidirectional reflectance distribution function (BRDF) product. This acquisition is obtained by using a kernel driven model and a large-scale directional gap fraction algorithm. The algorithm has been applied to estimate a LAI distribution in China in mid-July 2002. The ground data acquired from two field experiments in Changbai Mountain and Qilian Mountain were used to validate the algorithm. To resolve the scale discrepancy between high resolution ground observations and low resolution remote sensing data, two TM images with a resolution approaching the size of ground plots were used to relate the coarse resolution LAI map to ground measurements. First, an empirical relationship between the measured LAI and a vegetation index was established. Next, a high resolution LAI map was generated using the relationship. The LAI value of a low resolution pixel was calculated from the area-weighted sum of high resolution LAIs composing the low resolution pixel. The results of this comparison showed that the inversion algorithm has an accuracy of 82%. Factors that may influence the accuracy are also discussed in this paper.
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108
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Feng JX, Hou FF, Liang M, Wang GB, Zhang X, Li HY, Xie D, Tian JW, Liu ZQ. Restricted intake of dietary advanced glycation end products retards renal progression in the remnant kidney model. Kidney Int 2007; 71:901-11. [PMID: 17342181 DOI: 10.1038/sj.ki.5002162] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Diet-derived advanced glycation end products (AGEs) contribute significantly to accumulation of AGEs in renal insufficiency. To test whether modulation of dietary AGEs would impact on progression of chronic renal disease, 5/6 nephrectomy rats were randomly placed on three diets that differed only in AGEs content (low AGEs diet (LAD), high AGEs diet (HAD), and standard rodent diet (SRD)) for 5-13 weeks. Compared with SRD- or HAD-fed rats, LAD-treated animals showed decreased proteinuria and retarded decline of creatinine clearance without alteration of blood pressure. Glomerular volume was reduced by 23% compared with HAD-fed rats at week 13 (P<0.001). Renal fibrosis progressed with time in the remnant kidneys from HAD-fed rats. However, LAD-fed animals presented a better-preserved structure of the kidneys. LAD-fed rats demonstrated significantly decreased serum and renal AGEs concentration (P<0.01 and P<0.01). This was associated with marked decrease of intrarenal advanced oxidation protein products and thiobarbituric acid reactive substances, as well as increase of glutathione peroxidase activity. LAD treatment also downregulated expression of monocyte chemoattractant protein-1 and transforming growth factor-1 and ameliorated macrophage infiltration in the remnant kidney. These results demonstrated that restriction of dietary AGEs intake retards progression of renal fibrosis and dysfunction in the remnant kidney model.
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Widlowski JL, Taberner M, Pinty B, Bruniquel-Pinel V, Disney M, Fernandes R, Gastellu-Etchegorry JP, Gobron N, Kuusk A, Lavergne T, Leblanc S, Lewis PE, Martin E, Mõttus M, North PRJ, Qin W, Robustelli M, Rochdi N, Ruiloba R, Soler C, Thompson R, Verhoef W, Verstraete MM, Xie D. Third Radiation Transfer Model Intercomparison (RAMI) exercise: Documenting progress in canopy reflectance models. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007821] [Citation(s) in RCA: 160] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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110
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Wang G, Culbertson BM, Xie D, Seghi RR. PHYSICAL PROPERTY EVALUATIONS OF PERFLUOROTRIETHYLENE GLYCOL DIMETHACRYLATE AS A POTENTIAL REACTIVE DILUENT IN DENTAL COMPOSITE RESINS. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2007. [DOI: 10.1081/ma-100101527] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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111
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Kelley SK, Gelzleichter T, Xie D, Lee WP, Darbonne WC, Qureshi F, Kissler K, Oflazoglu E, Grewal IS. Preclinical pharmacokinetics, pharmacodynamics and activity of a humanized anti-CD40 antibody (SGN-40) in rodents and non-human primates. Br J Pharmacol 2007. [DOI: 10.1038/sj.bjp.0707129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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112
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Zhang YW, Xie D, Chen YX, Zhang HY, Xia ZX. Protective Effect of Gui Qi Mixture on the Progression of Diabetic Nephropathy in Rats. Exp Clin Endocrinol Diabetes 2006; 114:563-8. [PMID: 17177138 DOI: 10.1055/s-2006-948307] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Huang Qi (root of Astragalus membranaceus) and Dang Gui ( Angelica sinensis), two of the most widely used herbs in traditional Chinese medicine, have been proven to be effective in the treatment of diabetes mellitus (DM) although the underlying molecular mechanisms are not fully elucidated. This study was designed to investigate the protective effect of Dang Gui and Huang Qi mixture (GQM) on the development of diabetic nephropathy in rats with streptozotocin (STZ)-induced DM and the possible underlying molecular mechanism. The diabetic animal model was made by a single intraperitoneal injection of STZ and then treated with GQM or benazepril. Blood glucose, triglyceride (TG), cholesterol (CHO), high density lipoprotein (HDL), serum creatinine (Scr), creatinine clearance rate (Ccr), blood urea nitrogen (BUN), urine beta (2)-microglobin (beta (2)-MG), kidney/body weight (K/B) ratio, glomerular area (GA), renal transforming growth factor-beta (1) (TGF-beta (1)) mRNA expression and blood and renal angiotensin II (AngII) expression were determined 8 weeks after the treatment. The blood glucose, CHO and TG levels, BUN, SCr, Ccr. K/B ratio, GA, the excretion of beta (2)-MG, renal TGF-beta (1) mRNA expression and blood and renal AngII expression were significantly increased while the HDL level was decreased 8 week after STZ injection. The changes in blood glucose, TG, CHO and HDL were reversed by GQM, not by benazepril, whereas the changes in other variables were reversed by both GQM and benazepril. Our results suggest that GQM alleviates the disorder in blood glucose and lipids, protects against the progression of renal nephropathy in diabetic rats, probably by inhibiting the expression of AngII and TGF-beta (1) mRNA.
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Wu J, Feng Y, Xie D, Li X, Xiao W, Tao D, Qin J, Hu J, Gardner K, Judge SIV, Li QQ, Gong J. Unscheduled CDK1 activity in G1 phase of the cell cycle triggers apoptosis in X-irradiated lymphocytic leukemia cells. Cell Mol Life Sci 2006; 63:2538-45. [PMID: 17013563 PMCID: PMC11136101 DOI: 10.1007/s00018-006-6138-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclin-dependent kinase 1 (CDK1) is a major component of the cell cycle progression engine. Recently, several investigations provided evidence demonstrating that unscheduled CDK1 activation may also be involved in apoptosis in cancerous cells. In this article, we demonstrate that X-ray irradiation induced G1 arrest in MOLT-4 lymphocytic leukemia cells, the arrest being accompanied by reduction in the activity of CDK2, but increased CDK1 activity and cell apoptosis in the G1 phase. Interestingly, this increase in CDK1 and apoptosis by ionizing radiation was prevented by pretreatment with the CDK1 inhibitor, roscovitine, suggesting that CDK1 kinase activity is required for radiation-induced apoptotic cell death in this model system. Furthermore, cyclin B1 and CDK1 were detected co-localizing and associating in G1 phase MOLT-4 cells, with the cellular lysates from these cells revealing a genotoxic stress-induced increase in CDK1 phosphorylation (Thr-161) and dephosphorylation (Tyr-15), as analyzed by postsorting immunoprecipitation and immunoblotting. Finally, X-irradiation was found to increase Bcl-2 phosphorylation in G1 phase cells. Taken together, these novel findings suggest that CDK1 is activated by unscheduled accumulation of cyclin B1 in G1 phase cells exposed to X-ray, and that CDK1 activation, at the wrong time and in the wrong phase, may directly or indirectly trigger a Bcl-2-dependent signaling pathway leading to apoptotic cell death in MOLT-4 cells.
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Yin D, Xie D, Sakajiri S, Miller CW, Zhu H, Popoviciu ML, Said JW, Black KL, Koeffler HP. DLK1: increased expression in gliomas and associated with oncogenic activities. Oncogene 2006; 25:1852-61. [PMID: 16288219 DOI: 10.1038/sj.onc.1209219] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
DLK1 (delta-like) is a transmembrane and secreted protein in the epidermal growth factor-like homeotic family. Although expressed widely during embryonic development, only a few tissues retain the expression in adults. Neuroendocrine tumors often highly express this protein; therefore, we hypothesized that brain tumors might also express it. This study found that the expression of DLK1 in gliomas was higher than that in normal brain (P < 0.05). After stable transfection of a DLK1 cDNA expression vector into GBM cell lines, their proliferation was increased. Furthermore, they lost contact inhibition, had enhanced anchorage-independent growth in soft agar, and had significantly greater capacity to migrate. Western blot studies showed that expression of cyclin D1, CDK2, and E2F4 were increased, and Rb levels were decreased in these cells. DLK1 was found on the cell surface and secreted in the medium from the transfected GBM cells. DLK1-enriched condition medium stimulated the growth of glioblastoma multiforme cell lines and explants. DLK1 antibody blocked cell growth stimulated by DLK1. In summary, these results suggest that DLK1 may play a role in the formation or progression of gliomas.
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Lau SH, Sham JST, Xie D, Tzang CH, Tang D, Ma N, Hu L, Wang Y, Wen JM, Xiao G, Zhang WM, Lau GKK, Yang M, Guan XY. Clusterin plays an important role in hepatocellular carcinoma metastasis. Oncogene 2006; 25:1242-50. [PMID: 16247463 DOI: 10.1038/sj.onc.1209141] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
To identify genes associated with tumor metastasis in hepatocellular carcinoma (HCC), gene expression profiles between a pair of primary HCC (H2-P) and their matched metastatic HCC (H2-M) were compared. Overexpression of clusterin (CLU) was found in H2-M cells. To determine the roles CLU played in HCC metastasis, CLU was transfected into H2-P cells. Overexpression of CLU in H2-P cells increased cell migration by twofold in vitro and formation of metastatic tumor nodules in liver by eightfold in vivo. To evaluate the correlation of CLU expression with HCC metastasis, the expression levels of CLU in HCCs were investigated using a tissue microarray (TMA) containing 104 pairs of primary HCCs and their matched metastases. The frequency of CLU overexpression increased significantly in metastatic HCCs (59.1%) compared with that in primary tumors (32.6%, P<0.001). To gain additional insight into the function of CLU, the expression profile of H2P-CLU was compared with vector-transfected H2-P cells by cDNA microarray. A total of 35 upregulated and 14 downregulated genes were detected in H2P-CLU. One of the upregulated genes known as YKL-40, which is implicated in matrix-remodeling and metastasis, was further studied using TMA. A significant correlation (P<0.001) between the expression levels of YKL-40 and CLU was observed, implying that the CLU-YKL-40 pathway may play an important role in HCC metastasis.
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Xie D, Zeng YX, Wang HJ, Wen JM, Tao Y, Sham JST, Guan XY. Expression of cytoplasmic and nuclear Survivin in primary and secondary human glioblastoma. Br J Cancer 2006; 94:108-14. [PMID: 16404364 PMCID: PMC2361075 DOI: 10.1038/sj.bjc.6602904] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Clinically, human glioblastoma (GBM) may develop de novo or from a low-grade glioma (secondary GBM), and molecular alterations in the two pathways may differ. This study examined the status of Survivin expression and apoptosis in 30 primary and 26 secondary GBMs. Our results show that cytoplasmic Survivin positivity was significantly (P<0.001) more frequent in primary GBMs (83%) than that in secondary GBMs (46%). In addition, an inverse correlation of cytoplasmc Survivin positivity with GBM apoptotic index, and a positive association between cytoplasmic Survivin and size of the tumours were observed. These results suggest that cytoplasmic Survivin, via its antiapoptotic function, may be involved in the tumorigenesis of many primary GBMs, but only in a small fraction of secondary GBMs. Furthermore, the overall progression times from low-grade precursor lesions to secondary GBMs were significantly shorter (P<0.05) in cytoplasmic Survivin-positive cases (mean, 15.6 months) than those in Survivin-negative cases (mean, 23.8 moths), and the positive expression level of Survivin in cytoplasm was upregulated in most secondary GBMs when compared to matched pre-existing low-graded lesions. These results suggest that the increased accumulation of Survivin in the cytoplasm of more malignant glioma cells may prove to be a selective advantage, thus accelerating progression to a more aggressive phenotype.
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Xie D, Chen L, Liu C, Liu K. The inhibitory effects of oxytocin on distal colonic contractile activity in rabbits are enhanced by ovarian steroids. Acta Physiol (Oxf) 2006; 186:141-9. [PMID: 16497191 DOI: 10.1111/j.1365-201x.2005.01506.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
AIMS To study the effects of oxytocin on isolated rabbit distal colon and the regulation of ovarian steroids by its action. METHODS Muscle strips parallel to either the circular or the longitudinal fibres were excised and suspended in tissue chambers containing 5 mL Krebs solution (37 degrees C) and bubbled continuously with 95% O(2) and 5% CO(2). The effects of oxytocin on isometric spontaneous contractile responses were recorded. The effects of atosiban, tetrodotoxin, Mg(2+), progesterone and oestradiol on the oxytocin-induced response were also examined. RESULTS Oxytocin (1, 10 and 100 nmol L(-1)) dose dependently decreased the area under the contraction curve of distal colonic smooth muscle strips. The oxytocin receptor antagonist atosiban blocked the oxytocin (10 nmol L(-1))-caused responses in a dose-dependent manner. Tetrodotoxin (10 micromol L(-1)) had no effect on the oxytocin-induced response. Mg(2+)-free Krebs solution attenuated the oxytocin-induced response, but oestradiol (0.1 micromol L(-1)) or progesterone (0.1 micromol L(-1)) increased the oxytocin-induced response. CONCLUSION These results suggest that oxytocin inhibits the contractile motility of the distal colon, which is regulated by Mg(2+) and ovarian steroids.
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Zhang YW, Xie D, Xia B, Zhen RT, Liu IM, Cheng JT. Suppression of transforming growth factor-beta1 gene expression by Danggui buxue tang, a traditional Chinese herbal preparation, in retarding the progress of renal damage in streptozotocin-induced diabetic rats. Horm Metab Res 2006; 38:82-8. [PMID: 16523407 DOI: 10.1055/s-2006-925118] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Danggui buxue tang (DBT), a preparation containing Angelica sinensis (danggui) and Astragalus membranaceus (huangqi) at a ratio of 1 : 5, is used widely in China for stimulating red blood cell production and enhancing cardiovascular function. The present study was undertaken to characterize the effects of this preparation on diabetic nephropathy using streptozotocin-diabetic rats as a model. Streptozotocin-dependent alterations in renal weight/body weight ratio, urinary albumin and beta (2)-microglobulin concentrations, urinary albumin excretion rate, and creatinine clearance were ameliorated after eight weeks of treatment with either DBT or the angiotensin-converting enzyme inhibitor, benazepril. DBT, but not benazepril, partially attenuated the increases in blood glucose, triglycerides and cholesterol in STZ-diabetic rats. Additionally, the increased expression of transforming growth factor-beta (1) mRNA in the renal cortex due to streptozotocin-induced diabetes was modestly attenuated by these treatments. However, eight weeks of treatment with DBT failed to modify the concentration of angiotensin II in plasma or kidney, indicating that the ability of the preparation to retard the progression of kidney disease was not attributable to inhibition of the renin-angiotensin system. We propose that DBT alleviates renal alterations in diabetes and slows the progression of diabetic nephropathy by suppressing transforming growth factor-beta (1) mRNA expression. The preparation may therefore be useful as an adjuvant therapy for controlling diabetes and its complications.
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Qiao GB, Wu YL, Yang XN, Zhong WZ, Xie D, Guan XY, Fischer D, Kolberg HC, Kruger S, Stuerzbecher HW. High-level expression of Rad51 is an independent prognostic marker of survival in non-small-cell lung cancer patients. Br J Cancer 2005; 93:137-43. [PMID: 15956972 PMCID: PMC2361489 DOI: 10.1038/sj.bjc.6602665] [Citation(s) in RCA: 137] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
High-level expression of Rad51, a key factor in homologous recombination, has been observed in a variety of human malignancies. This study was aimed to evaluate Rad51 expression to serve as prognostic marker in non-small-cell lung cancer (NSCLC). A total of 383 non-small-cell lung tumours were analysed immunohistochemically on NSCLC tissue microarrays. High-level Rad51 expression was observed in 29.4% (100 out of 340) of cases. Patients whose tumours displayed high-level Rad51 expression showed a significantly shorter median survival time of 19 vs 68 months (P<0.0001, log-rank test). Similarly T status, N status, M status, clinical stage and histological tumour grade were significant prognostic markers in univariate Cox survival analysis. Importantly, Rad51 expression (P<0.0001) together with tumour differentiation (P<0.009), clinical stage (P=0.004) and N status (P=0.0001) proved to be independent prognostic parameters in multivariate analysis. Rad51 expression predicted the outcome of squamous cell cancer as well as adenocarcinoma of the lung. Our results suggest that Rad51 expression provides additional prognostic information for surgically treated NSCLC patients. We hypothesise that the decreased survival of NSCLC patients with high-level expression of Rad51 is related to an enhanced propensity of tumour cells for survival, antiapoptosis and chemo-/radioresistance.
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Zhong W, Qiao G, Xie D, Guan X, Ou W, Yang X, Lin J, Henning W, Stuerzbecher H, Wu Y. P-142 Prognostic role of e-cadherin in resected non-small-cell lungcancer detected by immunohistochemistry on high-throughput tissue microarray. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)80636-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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121
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Qiao G, Wu Y, Yang X, Zhong W, Xie D, Guan X, Stuerzbecher H. O-131 High level expression of Rad51 is an independent prognosticmarker of survival in non-small cell lung cancer patients. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)80265-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]
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122
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Hamrick MW, Pennington C, Newton D, Xie D, Isales C. Leptin deficiency produces contrasting phenotypes in bones of the limb and spine. Bone 2004; 34:376-83. [PMID: 15003785 DOI: 10.1016/j.bone.2003.11.020] [Citation(s) in RCA: 266] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2003] [Revised: 10/06/2003] [Accepted: 11/04/2003] [Indexed: 11/28/2022]
Abstract
Leptin is a hormone secreted by adipocytes that can regulate bone mass through a central, neuroendocrine signaling pathway. We tested the hypothesis that the response of bone tissue to altered leptin signaling is not uniform throughout the skeleton, but may vary between different skeletal regions and between cortical and trabecular moieties. We investigated the effects of leptin deficiency on muscle mass and bone architecture in obese, leptin-deficient (ob/ob) mice, and in lean controls. Results indicate that the obese mice weigh approximately twice as much as the lean mice, but the quadriceps muscles of the ob/ob mice are 40% smaller than those of controls. Leptin-deficient mice have significantly shorter femora, lower femoral bone mineral content (BMC), bone mineral density (BMD), cortical thickness, and trabecular bone volume compared to lean mice. Marrow tissue from the femora of ob/ob mice also shows a marked increase in adipocyte number compared to that of normal mice. In contrast to the pattern observed in the femur, ob/ob mice have significantly increased vertebral length, lumbar BMC, lumbar BMD, and trabecular bone volume compared to lean controls. Few adipocytes are observed in bone marrow from lumbar vertebrae of ob/ob mice, despite being numerous in marrow of the femur. However, like the femur, significant cortical thinning is also observed in the spine. These results indicate that the effects of altered leptin signaling on bone differ significantly between axial and appendicular regions, and may be mediated in part by muscle mass. The muscle hypoplasia, increased marrow adipogenesis, and decreased bone mass observed in the hindlimbs of ob/ob mice are also observed with aging in humans, suggesting that the ob/ob mouse may be a new and useful animal model for studying the relationship between bone marrow adipogenesis and osteopenia.
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Xie D, Hao F, Xie G, Wang L. LMI approach to L2-gain analysis and control synthesis of uncertain switched systems. ACTA ACUST UNITED AC 2004. [DOI: 10.1049/ip-cta:20040010] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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124
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Brouard M, Burak I, Marinakis S, Minayev D, O'Keeffe P, Vallance C, Aoiz FJ, Bañares L, Castillo JF, Zhang DH, Xie D, Yang M, Lee SY, Collins MA. Cross section for the H+H2O abstraction reaction: experiment and theory. PHYSICAL REVIEW LETTERS 2003; 90:093201. [PMID: 12689220 DOI: 10.1103/physrevlett.90.093201] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2002] [Indexed: 05/24/2023]
Abstract
The absolute value of the cross section for the abstraction reaction between fast H atoms and H2O has been determined experimentally at a mean collision energy of 2.46 eV. The OH population distribution at the same mean energy has also been determined. The new measurements are compared with state-of-the-art quantum mechanical and quasiclassical scattering calculations on the most recently developed potential energy surface.
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Yang X, Lu Y, Xie D. [Protective effect of Radix Salvia Miltiorrhizae on radiation damage of the cochlea]. HUNAN YI KE DA XUE XUE BAO = HUNAN YIKE DAXUE XUEBAO = BULLETIN OF HUNAN MEDICAL UNIVERSITY 2002; 24:465-7. [PMID: 12080686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
In order to evaluate the preventive and therapeutic effects of Radix Salvia Miltiorrhizae on radiation damage of the cochlea, guinea pigs were divided into 3 groups. Group 1 was treated by radiation added with Radix Salvia Miltiorrhizae. Group 2 was radiated alone, and Group 3 was control. Group 1 and Group 2 were radiated with a single dose of gamma radiation(60 Gy). Morphological and functional observation of the cochleae was performed in two weeks after radiation. The result showed that the changes of complex action potential(CAP) and the cochlear structure were slight in Group 1, but obvious changes were found in Group 2. There was a significant difference in CAP response threshold and incidence of the cochlear hair cell loss between Group 1 and Group 2 (P < 0.01). These results suggest that Radix Salvia Miltiorrhiza may prevent radiation-induced cochlea damage. Its protective mechanisms may be cleaning free radicals, blocking calcium channel and improving microcirculation of the cochlea.
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