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Aizpurua J, Szlarb N, Moragues I, Ramos B, Rogel S, Li J, Yin XY, Tan K, Tan YQ, Chen F, Zhang LEI, Lin G, Jiang H, Wang W, Wells D, Kaur K, Grifo J, Anderson S, Taylor J, Fragouli E, Munne S, Levy B, Banjevic M, Hill M, Zimmermann B, Ryan A, Sigurjonsson S, Wayham N, Lacroute P, Dodd M, Hoang B, Tong J, Vu P, Hall MP, Demko Z, Rabinowitz M, Spath K, Fragouli E, Konstantinidis M, Poli M, Wells D. Session 16: Innovations in reproductive genetics. Hum Reprod 2013. [DOI: 10.1093/humrep/det143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lam JKY, Wang Y, Shiu SWM, Wong Y, Betteridge DJ, Tan KCB. Effect of insulin on the soluble receptor for advanced glycation end products (RAGE). Diabet Med 2013; 30:702-9. [PMID: 23432638 DOI: 10.1111/dme.12166] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/19/2013] [Indexed: 12/17/2022]
Abstract
AIMS The receptor for advanced glycation end products (RAGE) plays an important role in the pathogenesis of diabetic complications. RAGE transcript splicing generates a number of isoforms, including a full-length membrane-bound receptor and a soluble isoform, endogenous secretory RAGE (esRAGE). Soluble forms of the receptor (sRAGE) can also be formed by ectodomain shedding of the membrane-associated receptor. We have evaluated serum levels of sRAGE and esRAGE in Chinese patients with Type 1 diabetes and investigated the effect of insulin on the generation of esRAGE and sRAGE in vitro. METHODS Serum sRAGE and esRAGE were measured by ELISA. The in vitro effect of insulin was investigated by incubating THP-1 macrophages with insulin and RAGE isoforms in cell lysate and conditioned media determined. RESULTS In patients with diabetes, both serum esRAGE and sRAGE were significantly higher than in age-matched healthy subjects without diabetes. In vitro, insulin increased esRAGE and total RAGE isoform expression in cell lysate on a western blot, and reverse transcription-polymerase chain reaction showed an increase in esRAGE and full-length RAGE mRNA. This was accompanied by an increase in esRAGE and sRAGE in cell conditioned media. Pretreatment of THP-1 cells with a general metalloproteinase inhibitor GM6001 significantly reduced the production of sRAGE, suggesting that insulin also increased the cleavage of full-length cell surface RAGE to form sRAGE. CONCLUSIONS Chinese patients with Type 1 diabetes have higher serum levels of esRAGE and sRAGE. In vitro, insulin not only increases both full-length RAGE and esRAGE expression, but can also stimulate the shedding of sRAGE from the membrane-bound receptor.
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Mettrick E, Tan K, Green L, Cashell A. An Interprofessional Approach to Teaching Patient Centred Care: A Workshop Review. J Med Imaging Radiat Sci 2013. [DOI: 10.1016/j.jmir.2012.12.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Xi Y, Wei Y, Sennino B, Ulsamer A, Kwan I, Brumwell AN, Tan K, Aghi MK, McDonald DM, Jablons DM, Chapman HA. Identification of pY654-β-catenin as a critical co-factor in hypoxia-inducible factor-1α signaling and tumor responses to hypoxia. Oncogene 2012; 32:5048-57. [PMID: 23246962 DOI: 10.1038/onc.2012.530] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 10/03/2012] [Accepted: 10/14/2012] [Indexed: 12/26/2022]
Abstract
Hypoxia is linked to epithelial-mesenchymal transition (EMT) and tumor progression in numerous carcinomas. Responses to hypoxia are thought to operate via hypoxia-inducible factors (HIFs), but the importance of co-factors that regulate HIF signaling within tumors is not well understood. Here, we elucidate a signaling pathway that physically and functionally couples tyrosine phosphorylation of β-catenin to HIF1α signaling and HIF1α-mediated tumor EMT. Primary human lung adenocarcinomas accumulate pY654-β-catenin and HIF1α. All pY654-β-catenin, and only the tyrosine phosphorylated form, was found complexed with HIF1α and active Src, both within the human tumors and in lung tumor cell lines exposed to hypoxia. Phosphorylation of Y654, generated by hypoxia mediated, reactive oxygen species (ROS)-dependent Src kinase activation, was required for β-catenin to interact with HIF1α and Src, to promote HIF1α transcriptional activity, and for hypoxia-induced EMT. Mice bearing hypoxic pancreatic islet adenomas, generated by treatment with anti-vascular endothelial growth factor antibodies, accumulate HIF1α/pY654-β-catenin complexes and develop an invasive phenotype. Concurrent administration of the ROS inhibitor N-acetylcysteine abrogated β-catenin/HIF pathway activity and restored adenoma architecture. Collectively, the findings implicate accumulation of pY654-β-catenin specifically complexed to HIF1α and Src kinase as critically involved in HIF1α signaling and tumor invasion. The findings also suggest that targeting ROS-dependent aspects of the pY654-β-catenin/ HIF1α pathway may attenuate untoward biological effects of anti-angiogenic agents and tumor hypoxia.
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105
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Hamilton S, Wai E, Tan K, Alexander C, Gascoyne R, Connors J. Treatment and Outcomes of Patients With Limited Stage Primary Cutaneous B-cell Lymphoma. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1642] [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]
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106
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Xiao SM, Gao Y, Cheung CL, Bow CH, Lau KS, Sham PC, Tan KCB, Kung AWC. Association of CDX1 binding site of periostin gene with bone mineral density and vertebral fracture risk. Osteoporos Int 2012; 23:1877-87. [PMID: 22215184 PMCID: PMC3368110 DOI: 10.1007/s00198-011-1861-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 09/12/2011] [Indexed: 12/03/2022]
Abstract
SUMMARY Periostin (POSTN) as a regulator of osteoblast differentiation and bone formation may affect susceptibility to osteoporosis. This study suggests POSTN as a candidate gene for bone mineral density (BMD) variation and vertebral fracture risk, which could better our understanding about the genetic pathogenesis of osteoporosis and will be useful in clinic in the future. INTRODUCTION The genetic determination of osteoporosis is complex and ill-defined. Periostin (POSTN), an extracellular matrix secreted by osteoblasts and a regulator of osteoblast differentiation and bone formation, may affect susceptibility to osteoporosis. METHODS We adopted a tag-single nucleotide polymorphism (SNP) based association method followed by imputation-based verification and identification of a causal variant. The association was investigated in 1,572 subjects with extreme-BMD and replicated in an independent population of 2,509 subjects. BMD was measured by dual X-ray absorptiometry. Vertebral fractures were identified by assessing vertebral height from X-rays of the thoracolumbar spine. Association analyses were performed with PLINK toolset and imputation analyses with MACH software. The top imputation finding was subsequently validated by genotyping. Interactions between POSTN and another BMD-related candidate gene sclerostin (SOST) were analyzed using MDR program and validated by logistical regression analyses. The putative transcription factor binding with target sequence was confirmed by electrophoretic mobility shift assay (EMSA). RESULTS Several SNPs of POSTN were associated with BMD or vertebral fractures. The most significant polymorphism was rs9547970, located at the -2,327 bp upstream (P = 6.8 × 10(-4)) of POSTN. Carriers of the minor allele G per copy of rs9547970 had 1.33 higher risk of vertebral fracture (P = 0.007). An interactive effect between POSTN and SOST upon BMD variation was suggested (P < 0.01). A specific binding of CDX1 to the sequence of POSTN with the major allele A of rs9547970 but not the variant G allele was confirmed by EMSA. CONCLUSIONS Our results suggest POSTN as a candidate gene for BMD variation and vertebral fracture risk.
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Yin X, Tan K, Zhang C, Chen S, Zhang C, Pan X, Li X, Chen F, Jiang H, Lin G, Lu G, Zhang X. O11 Blastocyst trophoderm cells screening by massively parallel sequencing for aneuploidy and imbalanced chromosomal arrangements detection. Reprod Biomed Online 2012. [DOI: 10.1016/s1472-6483(12)60216-8] [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]
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108
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See A, Peh WM, Tan K. Systemic Autoantibodies in Neuromyelitis Optica: Is There Any Impact on Clinical Outcome? (P07.069). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p07.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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109
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Kam KQ, Tan Shi En G, Tan K, Lim Chuen Hian E, Koh NY, Tan Choon Kiat N. Neurophobia in Medical Students and Junior Doctors in Singapore - Blame the GIK (P07.246). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p07.246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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110
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Chong YFV, Tan K. A Survey of Lumbar Puncture Complications and Their Risk Factors: The Influence of Height, Intravenous Hydration and Systolic Blood Pressure on Post-Dural Puncture Headache (P04.250). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p04.250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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111
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Dooley M, Tan K, Poole S. Improving the efficiency, safety and security of controlled drugs inventory management with the Pyxis C11 Safe System. Eur J Hosp Pharm 2012. [DOI: 10.1136/ejhpharm-2012-000074.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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112
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Diaz M, Rajan D, Tan K. Abstract No. 325: Portal vein embolization: spectrum of embolic agents with illustrated examples. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.382] [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] Open
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113
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Jaskolka J, Tan K, Davidson T, Rubin B. Abstract No. 177: Intraoperative intra-arterial CTA for assessment of complications after EVAR: initial experience. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.223] [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] Open
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114
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Lim T, Kowalski S, Tan K. Impact of Asthma Counseling by Pharmacist on Asthma Control and Medication Adherence in Asia. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.416] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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115
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Tan K, Brewer J, Rowe DB, Jenkins B, Powers JM, Buckland ME. Adult onset leucodystrophy with neuroaxonal spheroids and pigmented glia (ALSP): report of a new kindred. Neuropathol Appl Neurobiol 2012; 38:95-100. [DOI: 10.1111/j.1365-2990.2011.01173.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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116
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Goh T, Tan K, Goh T, Willis Y, Chan C. Exercise Testing (Et) in Coarctation of Aorta (COA)—A 20-Year Experience. Heart Lung Circ 2012. [DOI: 10.1016/j.hlc.2012.05.717] [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]
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117
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Schuetz JM, Johnson NA, Morin RD, Scott DW, Tan K, Ben-Nierah S, Boyle M, Slack GW, Marra MA, Connors JM, Brooks-Wilson AR, Gascoyne RD. BCL2 mutations in diffuse large B-cell lymphoma. Leukemia 2011; 26:1383-90. [PMID: 22189900 DOI: 10.1038/leu.2011.378] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BCL2 is deregulated in diffuse large B-cell lymphoma (DLBCL) by the t(14;18) translocation, gene amplification and/or nuclear factor-κB signaling. RNA-seq data have recently shown that BCL2 is the most highly mutated gene in germinal center B-cell (GCB) DLBCL. We have sequenced BCL2 in 298 primary DLBCL biopsies, 131 additional non-Hodgkin lymphoma biopsies, 24 DLBCL cell lines and 51 germline DNAs. We found frequent BCL2 mutations in follicular lymphoma (FL) and GCB DLBCL, but low levels of BCL2 mutations in activated B-cell DLBCL, mantle cell lymphoma, small lymphocytic leukemia and peripheral T-cell lymphoma. We found no BCL2 mutations in GC centroblasts. Many mutations were non-synonymous; they were preferentially located in the flexible loop domain, with few in BCL2-homology domains. An elevated transition/transversions ratio supports that the mutations result from somatic hypermutation. BCL2 translocations correlate with, and are likely important in acquisition of, additional BCL2 mutations in GCB DLBCL and FL. DLBCL mutations were not independently associated with survival. Although previous studies of BCL2 mutations in FL have reported mutations to result in pseudo-negative BCL2 protein expression, we find this rare in de-novo DLBCL.
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Barnes L, Kaneshige K, Strong J, Tan K, von Bremen H, Mogul R. Effects of terbium chelate structure on dipicolinate ligation and the detection of Bacillus spores. J Inorg Biochem 2011; 105:1580-8. [DOI: 10.1016/j.jinorgbio.2011.08.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 07/30/2011] [Accepted: 08/01/2011] [Indexed: 10/17/2022]
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Joachimiak A, Tan K, Michalska K, Babnigg G. Structures of glucoside hydrolases from human gut microbiome. Acta Crystallogr A 2011. [DOI: 10.1107/s010876731109458x] [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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120
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Rajput A, Rajan D, Tan K, Beecroft R, Jaskolka J, Kachura J, Simons M, Sniderman K. Abstract No. 224: Pseudoaneurysms in native hemodialysis fistulas: Is there an association with venous outflow stenoses? J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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121
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Grenville J, Tan K, Tse L, Rajan D, Lindsay T. Abstract No. 363: Branched stent-graft repair: Which bridging stent-grafts should be used? J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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122
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Oreopoulos G, Lindsay T, Rubin B, Rajan D, Sniderman K, Tan K. Abstract No. 155: Endovascular repair of ruptured aneurysms (REVAR) at a Canadian regional vascular centre. J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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123
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Yau J, Rajan D, Tan K, Beecroft R, Simons M, Kachura J, Jaskolka J, Sniderman K. Abstract No. 230: Evaluation of central vein sizes in dialysis patients with arteriovenous fistulas. J Vasc Interv Radiol 2011. [DOI: 10.1016/j.jvir.2011.01.253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Tan V, Tan C, Chow J, Tan K, Lingamanaicker J, Lim V, Tong K, Leong G, Gan H, Goh Y, Lee S, Goh P. OP-016: FEASIBILITY OF STEP DOWN CARE UNIT IN PATIENTS WITH ACUTE ST ELEVATION MYOCARDIAL INFARCTION WHO REMAINED IN KILLIP CLASS 2 VERSUS KILLIP CLASS 1 IMMEDIATE POST SUCCESSFUL PRIMARY PERCUTANEOUS INTERVENTION: SINGLE CENTRE EXPERIENCE. Int J Cardiol 2011. [DOI: 10.1016/s0167-5273(11)70127-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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125
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Parise JB, Tan K, Norby P, Ko Y, Cahill C. Examples of Hydrothermal Titration and Real Time X-Ray Diffraction in the Synthesis of Open Frameworks. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-453-103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractHydrothermal titration (HTT) techniques represent a new synthetic strategy for the production of open frameworks. As an example, initial digestion of amorphous GeS2 in the presence of tetraethyl ammonium hydroxide (TEAOH) at 100°C is followed by injection of Ag+ into this mixture to condense the [Ge4S10]4− clusters and form a framework consisting of 8-ring channels bounded by alternating GeS-clusters and Ag+. The rational use of this apparatus depends upon determining the timing of injection. Insight into the changes occurring during reactant digestion is provided by real time synchrotron X-ray powder diffraction. Changes in the the system dimethylamine-Sb-S have been followed in real time at different temperatures. The transformation from mixtures of DMA, Sb and S to the known open phase DMA-SbS-SB8 was followed by observing monochromatic X-ray scattering detected on an imaging plates over a 8 hr period with one continuous exposure.
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