1
|
Abuhusain H, Matin A, Qiao Q, Shen H, Daniels B, Laaksonen M, Teo C, Don A, McDonald K, Jahangiri A, De Lay M, Lu K, Park C, Carbonell S, Bergers G, Aghi MK, Anand M, Tucker-Burden C, Kong J, Brat DJ, Bae E, Smith L, Muller-Greven G, Yamada R, Nakano-Okuno M, Feng X, Hambardzumyan D, Nakano I, Gladson CL, Berens M, Jung S, Kim S, Kiefer J, Eschbacher J, Dhruv H, Vuori K, Hauser C, Oshima R, Finlay D, Aza-Blanc P, Bessarabova M, Nikolsky Y, Emig D, Bergers G, Lu K, Rivera L, Chang J, Burrell K, Singh S, Hill R, Zadeh G, Li C, Chen Y, Mei X, Sai K, Chen Z, Wang J, Wu M, Marsden P, Das S, Eskilsson E, Talasila KM, Rosland GV, Leiss L, Saed HS, Brekka N, Sakariassen PO, Lund-Johansen M, Enger PO, Bjerkvig R, Miletic H, Gawrisch V, Ruttgers M, Weigell P, Kerkhoff E, Riemenschneider M, Bogdahn U, Vollmann-Zwerenz A, Hau P, Ichikawa T, Onishi M, Kurozumi K, Maruo T, Fujii K, Ishida J, Shimazu Y, Oka T, Chiocca EA, Date I, Jain R, Griffith B, Khalil K, Scarpace L, Mikkelsen T, Kalkanis S, Schultz L, Jalali S, Chung C, Burrell K, Foltz W, Zadeh G, Jiang C, Wang H, Kijima N, Hosen N, Kagawa N, Hashimoto N, Chiba Y, Kinoshita M, Sugiyama H, Yoshimine T, Klank R, Decker S, Forster C, Price M, SantaCruz K, McCarthy J, Ohlfest J, Odde D, Kurozumi K, Onishi M, Ichikawa T, Fujii K, Ishida J, Shimazu Y, Chiocca EA, Kaur B, Date I, Huang Y, Lin Q, Mao H, Wang Y, Kogiso M, Baxter P, Man C, Wang Z, Zhou Y, Li XN, Liang J, Piao Y, de Groot J, Lu K, Rivera L, Chang J, Bergers G, McDonell S, Liang J, Piao Y, Henry V, Holmes L, de Groot J, Michaelsen SR, Stockhausen MT, Hans, Poulsen S, Rosland GV, Talasila KM, Eskilsson E, Jahedi R, Azuaje F, Stieber D, Foerster S, Varughese J, Ritter C, Niclou SP, Bjerkvig R, Miletic H, Talasila KM, Soentgerath A, Euskirchen P, Rosland GV, Wang J, Huszthy PC, Prestegarden L, Skaftnesmo KO, Sakariassen PO, Eskilsson E, Stieber D, Keunen O, Nigro J, Vintermyr OK, Lund-Johansen M, Niclou SP, Mork S, Enger PO, Bjerkvig R, Miletic H, Mohan-Sobhana N, Hu B, De Jesus J, Hollingsworth B, Viapiano M, Muller-Greven G, Carlin C, Gladson C, Nakada M, Furuta T, Sabit H, Chikano Y, Hayashi Y, Sato H, Minamoto T, Hamada JI, Fack F, Espedal H, Obad N, Keunen O, Gotlieb E, Sakariassen PO, Miletic H, Niclou SP, Bjerkvig R, Bougnaud S, Golebiewska A, Stieber D, Oudin A, Brons NHC, Bjerkvig R, Niclou SP, O'Halloran P, Viel T, Schwegmann K, Wachsmuth L, Wagner S, Kopka K, Dicker P, Faber C, Jarzabek M, Hermann S, Schafers M, O'Brien D, Prehn J, Jacobs A, Byrne A, Oka T, Ichikawa T, Kurozumi K, Inoue S, Fujii K, Ishida J, Shimazu Y, Chiocca EA, Date I, Olsen LS, Stockhausen M, Poulsen HS, Plate KH, Scholz A, Henschler R, Baumgarten P, Harter P, Mittelbronn M, Dumont D, Reiss Y, Rahimpour S, Yang C, Frerich J, Zhuang Z, Renner D, Jin F, Parney I, Johnson A, Rockne R, Hawkins-Daarud A, Jacobs J, Bridge C, Mrugala M, Rockhill J, Swanson K, Schneider H, Szabo E, Seystahl K, Weller M, Takahashi Y, Ichikawa T, Maruo T, Kurozumi K, Onishi M, Ouchida M, Fuji K, Shimazu Y, Oka T, Chiocca EA, Date I, Umakoshi M, Ichikawa T, Kurozumi K, Onishi M, Fujii K, Ishida J, Shimazu Y, Oka T, Chiocca EA, Kaur B, Date I, Sim H, Gruenbacher P, Jakeman L, Viapiano M, Wang H, Jiang C, Wang H, Jiang C, Parker J, Dionne K, Canoll P, DeMasters B, Waziri A. ANGIOGENESIS AND INVASION. Neuro Oncol 2013. [DOI: 10.1093/neuonc/not172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
2
|
Nisbet RM, Nigro J, Breheney K, Caine J, Hattarki MK, Nuttall SD. Central amyloid-β-specific single chain variable fragment ameliorates Aβ aggregation and neurotoxicity. Protein Eng Des Sel 2013; 26:571-80. [PMID: 23766374 DOI: 10.1093/protein/gzt025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Anti-amyloid-β immunotherapies are a promising therapeutic approach for the treatment and prevention of Alzheimer's disease (AD). Single chain antibody fragments (scFv) are an attractive alternative to whole antibodies due to their small size, single polypeptide format and inability to stimulate potentially undesirable Fc-mediated immune effector functions. We have generated the scFv derivative of anti-Aβ monoclonal antibody, 1E8, known to target residues 17-22 of Aβ. Here we show that the soluble 1E8 scFv binds to the central region of Aβ with an affinity of ~55 nM and significantly reduces fibril formation of Aβ(1-42). Furthermore, 1E8 scFv ameliorates Aβ(1-42)-mediated toxicity in the PC12 cell line and murine primary neuronal cultures. This ability to both target the central region of Aβ and prevent Aβ(1-42) neurotoxicity in vitro makes it a promising therapeutic antibody building block for further functionalization, toward the treatment of AD.
Collapse
Affiliation(s)
- R M Nisbet
- Division of Materials Science and Engineering, CSIRO Preventative Health Flagship, 343 Royal Parade, Parkville, Victoria 3052, Australia
| | | | | | | | | | | |
Collapse
|
3
|
Talasila KM, Soentgerath A, Euskirchen P, Rosland GV, Wang J, Huszthy PC, Prestegarden L, Skaftnesmo KO, Sakariassen PØ, Eskilsson E, Keunen O, Brekka N, Moen I, Nigro J, Vintermyr O, Lund-Johansen M, Mørk SJ, Enger PØ, Bjerkvig R, Miletic H. Abstract LB-518: Amplification and activation of EGFR wild-type mediates invasion of human glioblastoma in vivo. Cancer Res 2012. [DOI: 10.1158/1538-7445.am2012-lb-518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Glioblastoma (GBM) is the most aggressive form of primary brain tumors with a median survival of 15 months. Although angiogenesis is one of the main features of GBMs, non-angiogenic tumor infiltration into brain parenchyma still is the major challenge for therapy. Tumor cells can migrate very far from the main tumor mass and the invasive pattern of tumor subpopulations has not been characterized properly. Epidermal growth factor receptor (EGFR) gene amplification is one of the major mutations of primary GBMs, where multiple copies of the wild-type EGFR gene are present as double minutes. Although studies have proposed a role for EGFR gene amplification in tumor development, the function of EGFR in vivo is not characterized properly mainly due to inefficient tumor models. Here, we report a key role for EGFR wild-type in tumor invasion. In a human GBM xenograft model, we show that tumor cells with EGFR amplification and expression are highly invasive and non-angiogenic. By blocking EGFR activation using Cetuximab and a dominant-negative approach, we show that maintenance of the non-angiogenic, invasive growth pattern is dependent on EGFR function and that downregulation of its activity leads to angiogenic tumor growth. As EGFR amplification and expression is present in 40-60% of GBMs, our results might implicate that activation of EGFR wild-type is one of the major mechanisms of glioblastoma invasion in vivo.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr LB-518. doi:1538-7445.AM2012-LB-518
Collapse
Affiliation(s)
| | | | | | | | - Jian Wang
- 1University of Bergen, Bergen, Norway
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Dyksterhuis LB, Dyksterhuis LD, White JF, Hickey M, Kirby N, Mudie S, Hawley A, Vashi A, Nigro J, Werkmeister JA, Ramshaw JAM. Impact of heparan sulfate chains and sulfur-mediated bonds on the mechanical properties of bovine lens capsule. Biophys J 2011; 100:2077-83. [PMID: 21539774 DOI: 10.1016/j.bpj.2011.03.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Revised: 03/15/2011] [Accepted: 03/18/2011] [Indexed: 01/03/2023] Open
Abstract
We assessed the importance of glycosaminoglycans and sulfur-mediated bonds for the mechanical properties of lens capsules by comparing the stress-strain responses from control and treated pairs of bovine source. No significant change in mechanical properties was observed upon reduction of disulfide bonds. However, removal of glycosaminoglycan chains resulted in a significantly stiffer lens capsule, whereas high concentrations of reducing agent, which is expected to reduce the recently reported sulfilimine bond of collagen IV, resulted in a significantly less stiff lens capsule. A comparison of the diffraction patterns of the control and strongly reduced lens capsules indicated structural rearrangements on a nanometer scale.
Collapse
Affiliation(s)
- L B Dyksterhuis
- CSIRO Materials Science and Engineering, Clayton, Australia.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Dyksterhuis L, White J, Hickey M, Kirby N, Mudie S, Hawley A, Vashi A, Nigro J, Werkmeister J, Ramshaw J. Correction. Biophys J 2011. [DOI: 10.1016/j.bpj.2011.05.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
|
6
|
Jensen RL, Gilliespie D, Ajewung N, Faure R, Kamnasaran D, Ajewung N, Poirier D, Kamnasaran D, Tamura K, Wakimoto H, Rabkin SD, Martuza RL, Shah K, Hashizume R, Aoki Y, Serwer LP, Drummond D, Noble C, Park J, Bankiewicz K, James DC, Gupta N, Agerholm-Larsen B, Iversen HK, Jensen KS, Moller J, Ibsen P, Mahmood F, Gehl J, Corem E, Ram Z, Daniels D, Last D, Shneor R, Salomon S, Perlstein B, Margel S, Mardor Y, Charest G, Fortin D, Mathieu D, Sanche L, Paquette B, Li HF, Hashizume R, Aoki Y, Hariono S, Dasgupta T, Kim JS, Haas-Kogan D, Weiss WA, Gupta N, James CD, Waldman T, Nicolaides T, Ozawa T, Rao S, Sun H, Ng C, De La Torre J, Santos R, Prados M, James CD, Butowski N, Michaud K, Solomon DA, Li HF, Kim JS, Prados MD, Ozawa T, Waldman T, James CD, Pandya H, Gibo D, Debinski W, Vinchon-Petit S, Jarnet D, Jadaud E, Feuvret L, Garcion E, Menei P, Chen R, Yu JC, Liu C, Jaffer ZM, Chabala JC, Winssinger N, Rubenstein AE, Emdad L, Kothari H, Qadeer Z, Binello E, Germano I, Hirschberg H, Baek SK, Kwon YJ, Sun CH, Li SC, Madsen S, Debinski W, Liu T, Wang SW, Gibo DM, Fan QW, Cheng C, Hackett C, Feldman M, Houseman BT, Houseman BT, Nicolaides T, James CD, Haas-Kogan D, Oakes SA, Debnath J, Shokat KM, Weiss WA, Sai K, Chen F, Qiu Z, Mou Y, Zhang X, Yang Q, Chen Z, Patel TR, Zhou J, Piepmeier JM, Saltzman WM, Banerjee S, Kaul A, Gianino SM, Christians U, Gutmann DH, Wu J, Shen R, Puduvalli V, Koul D, Alfred Yung WK, Yun J, Sonabend A, Stuart M, Yanagihara T, Dashnaw S, Brown T, McCormick P, Romanov A, Sebastian M, Canoll P, Bruce JN, Piao L, Joshi K, Lee RJ, Nakano I, Madsen SJ, Chou CC, Blickenstaff JW, Sun CH, Zhou YH, Hirschberg H, Tome CML, Wykosky J, Palma E, Debinski W, Nduom E, Machaidze R, Kaluzova M, Wang Y, Nie S, Hadjipanayis C, Saito R, Nakamura T, Sonoda Y, Kumabe T, Tominaga T, Lun X, Zemp F, Zhou H, Stechishin O, Kelly JJ, Weiss S, Hamilton MG, Cairncross G, Rabinovich BA, Bell J, McFadden G, Senger DL, Forsyth PA, Kang P, Jane EP, Premkumar DR, Pollack IF, Yoo JY, Haseley A, Bratasz A, Powell K, Chiocca EA, Kaur B, Johns TG, Ferruzzi P, Mennillo F, De Rosa A, Rossi M, Giordano C, Magrini R, Benedetti G, Pericot GL, Magnoni L, Mori E, Thomas R, Tunici P, Bakker A, Yoo JY, Pradarelli J, Kaka A, Alvarez-Breckenridge C, Pan Q, Teknos T, Chiocca EA, Kaur B, Cen L, Ostrem JL, Schroeder MA, Mladek AC, Fink SR, Jenkins RB, Sarkaria JN, Madhankumar AB, Slagle-Webb B, Park A, Pang M, Klinger M, Harbaugh KS, Sheehan JM, Connor JR, Chen TC, Wang W, Hofman FM, Serwer LP, Michaud K, Drummond DC, Noble CO, Park JW, Ozawa T, James CD, Serwer LP, Noble CO, Michaud K, Drummond DC, Ozawa T, Zhou Y, Marks JD, Bankiewicz K, Park JW, James CD, Alonso MM, Gomez-Manzano C, Cortes-Santiago N, Roche FP, Fueyo J, Johannessen TCA, Grudic A, Tysnes BB, Nigro J, Bjerkvig R, Joshi AD, Parsons W, Velculescu VE, Riggins GJ, Bindra RS, Jasin M, Powell SN, Fu J, Koul D, Shen RJ, Colman H, Lang FF, Jensen MR, Alfred Yung WK, Friedman GK, Haas M, Cassady KA, Gillespie GY, Nguyen V, Murphy LT, Beauchamp AS, Hollingsworth CK, Debinski W, Mintz A, Pandya H, Garg S, Gibo D, Kridel S, Debinski W, Conrad CA, Madden T, Ji Y, Colman H, Priebe W, Seleverstov O, Purow BW, Grant GA, Wilson C, Campbell M, Humphries P, Li S, Li J, Johnson A, Bigner D, Dewhirst M, Sarkaria JN, Cen L, Pokorny JL, Mladek AC, Kitange GJ, Schroeder MA, Carlson BL, Suphangul M, Petro B, Mukhtar L, Baig MS, Villano J, Mahmud N, Keir ST, Reardon DA, Watson M, Shore GC, Bigner DD, Friedman HS, Keir ST, Gururangan S, Reardon DA, Bigner DD, Friedman HS. Pre-clinical Experimental Therapeutics and Pharmacology. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
7
|
Costa BM, Smith JS, Chen Y, Chen J, Phillips HS, Aldape KD, Zardo G, Nigro J, James CD, Fridlyand J, Reis RM, Costello JF. Reversing HOXA9 oncogene activation by PI3K inhibition: epigenetic mechanism and prognostic significance in human glioblastoma. Cancer Res 2010; 70:453-62. [PMID: 20068170 DOI: 10.1158/0008-5472.can-09-2189] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
HOXA genes encode critical transcriptional regulators of embryonic development that have been implicated in cancer. In this study, we documented functional relevance and mechanism of activation of HOXA9 in glioblastoma (GBM), the most common malignant brain tumor. Expression of HOXA genes was investigated using reverse transcription-PCR in primary gliomas and glioblastoma cell lines and was validated in two sets of expression array data. In a subset of GBM, HOXA genes are aberrently activated within confined chromosomal domains. Transcriptional activation of the HOXA cluster was reversible by a phosphoinostide 3-kinase (PI3K) inhibitor through an epigenetic mechanism involving histone H3K27 trimethylation. Functional studies of HOXA9 showed its capacity to decrease apoptosis and increase cellular proliferation along with tumor necrosis factor-related apoptosis-including ligand resistance. Notably, aberrant expression of HOXA9 was independently predictive of shorter overall and progression-free survival in two GBM patient sets and improved survival prediction by MGMT promoter methylation. Thus, HOXA9 activation is a novel, independent, and negative prognostic marker in GBM that is reversible through a PI3K-associated epigenetic mechanism. Our findings suggest a transcriptional pathway through which PI3K activates oncogenic HOXA expression with implications for mTOR or PI3K targeted therapies.
Collapse
Affiliation(s)
- Bruno M Costa
- The Brain Tumor Research Center, Department of Neurological Surgery, University of California-San Francisco, San Francisco, California 94158-9001, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Alonso MM, Fueyo J, Shay JW, Aldape KD, Jiang H, Lee OH, Johnson DG, Xu J, Kondo Y, Kanzawa T, Kyo S, Bekele BN, Zhou X, Nigro J, McDonald JM, Yung WKA, Gomez-Manzano C. Expression of transcription factor E2F1 and telomerase in glioblastomas: mechanistic linkage and prognostic significance. J Natl Cancer Inst 2005; 97:1589-600. [PMID: 16264179 DOI: 10.1093/jnci/dji340] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Several tumor suppressor pathways have been identified as modulators of telomerase function. We examined the functional role of the retinoblastoma-E2F1 pathway in regulating telomerase activity in malignant gliomas. METHODS Adenovirus vectors were used to transfer cDNAs into human glioblastoma and sarcoma cells. Telomerase activity was assessed with a telomere repeat amplification protocol. Promoter activity in cancer cells was assessed with promoter-luciferase reporter constructs. Promoter binding was assessed with the chromatin immunoprecipitation (ChIP) assay. We isolated astrocytes from E2F1 transgenic mice and normal mice for in vivo studies. We evaluated the expression of E2F1 and hTERT (the catalytic subunit of human telomerase) mRNAs by reverse transcriptase-polymerase chain reaction and proteins in human glioblastoma samples by immunoblot analysis. Associations between survival among 61 glioblastoma multiforme patients and expression of E2F1 and hTERT mRNA and protein were examined with Kaplan-Meier analysis, the log-rank test, and Cox proportional hazards regression models. All statistical tests were two-sided. RESULTS Ectopic E2F1 expression increased hTERT promoter activity in cancer cells. We detected an interaction between E2F1 protein and the hTERT promoter. Transgenic E2F1 astrocytes contained functional telomerase protein. E2F1 mRNA expression and hTERT mRNA expression were statistically significantly correlated in human glioblastoma specimens (R = .8; P < .001). Longer median survival was statistically significantly associated with lower E2F1 mRNA expression in tumors (103.6 weeks) rather than with higher expression (46.1 weeks) (difference = 57.5 weeks; 95% confidence interval [CI] = 14.7 to 159.7; log-rank P = .002). E2F1 mRNA was the only factor that was statistically significantly associated with overall survival in a multivariable model (P = .04). Among 27 patients with glioblastoma multiforme samples, the expression of E2F1 protein was statistically significantly associated with survival (log-rank P < .001). CONCLUSIONS E2F1 may participate in telomerase activity regulation in malignant glioma cells. Its expression appears to be strongly associated with the survival of patients with malignant brain tumors.
Collapse
Affiliation(s)
- Marta M Alonso
- Department of Neuro-Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Misra A, Pellarin M, Nigro J, Smirnov I, Moore D, Lamborn KR, Pinkel D, Albertson DG, Feuerstein BG. Array Comparative Genomic Hybridization Identifies Genetic Subgroups in Grade 4 Human Astrocytoma. Clin Cancer Res 2005; 11:2907-18. [PMID: 15837741 DOI: 10.1158/1078-0432.ccr-04-0708] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Alterations of DNA copy number are believed to be important indicators of tumor progression in human astrocytoma. We used an array of bacterial artificial chromosomes to map relative DNA copy number in 50 primary glioblastoma multiforme tumors at approximately 1.4-Mb resolution. We identified 33 candidate sites for amplification and homozygous deletion in these tumors. We identified three major genetic subgroups within these glioblastoma multiforme tumors: tumors with chromosome 7 gain and chromosome 10 loss, tumors with only chromosome 10 loss in the absence of chromosome 7 gain, and tumors without copy number change in chromosomes 7 or 10. The significance of these genetic groups to therapeutics needs further study.
Collapse
Affiliation(s)
- Anjan Misra
- Brain Tumor Research Center, Department of Neurosurgery, University of California San Francisco, San Francisco, California, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Nigro J, Ballinger ML, Dilley RJ, Jennings GLR, Wight TN, Little PJ. Fenofibrate modifies human vascular smooth muscle proteoglycans and reduces lipoprotein binding. Diabetologia 2004; 47:2105-13. [PMID: 15592811 DOI: 10.1007/s00125-004-1588-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2004] [Accepted: 07/19/2004] [Indexed: 01/22/2023]
Abstract
AIMS/HYPOTHESIS Vascular disease in type 2 diabetes is associated with an up-regulation of atherogenic growth factors, which stimulate matrix synthesis including proteoglycans. We have examined the direct actions of fenofibrate on human vascular smooth muscle cells (VSMCs) and have specifically investigated proteoglycan synthesis and binding to LDL. METHODS Proteoglycans synthesised by human VSMCs treated with fenofibrate (30 micromol/l) were assessed for binding to human LDL using a gel mobility shift assay, metabolically labelled with [(35)S]-sulphate and quantitated by cetylpyridinium chloride. They were then assessed for electrophoretic mobility by SDS-PAGE, for size by gel filtration, for sulphation pattern by fluorophore-assisted carbohydrate electrophoresis, and for glycosaminoglycan (GAG) composition by enzyme digestion. RESULTS Proteoglycans synthesised in the presence of fenofibrate showed an increase in the half-maximum saturation concentration of LDL from 36.8+/-12.4 microg/ml to 77.7+/-17 microg/ml under basal conditions, from 24.9+/-4.6 microg/ml to 39.1+/-6.1 microg/ml in the presence of TGF-beta1, and from 9.5+/-4.4 microg/ml to 31.1+/-3.4 microg/ml in the presence of platelet-derived growth factor/insulin. Fenofibrate treatment in the presence of TGF-beta1 inhibited the incorporation of [(35)S]-sulphate into secreted and cell-associated proteoglycans synthesised by human VSMCs by 59.2% (p<0.01) and 39.8% (p<0.01) respectively. The changes in sulphate incorporation following treatment with fenofibrate were associated with a concentration-related increase in the electrophoretic mobility due to a reduction in GAG length. There was no change in the sulphation pattern; however, there was an alteration in the disaccharide composition of the GAGs. CONCLUSIONS/INTERPRETATION Fenofibrate modifies the structure of vascular proteoglycans by reducing the length of the GAG chains and GAG composition, resulting in reduced binding to human LDL, a mechanism which may lead to a reduction of atherosclerosis and cardiovascular disease in people with diabetes treated with fenofibrate.
Collapse
Affiliation(s)
- J Nigro
- Cell Biology of Diabetes Laboratory, Baker Heart Research Institute, St. Kilda Rd Central, PO Box 6492, Melbourne, Victoria, 8008, Australia
| | | | | | | | | | | |
Collapse
|
11
|
Abstract
Cardiovascular disease is the major cause of premature death in modern society, and its impact is increasing due to rising rates of obesity and type 2 diabetes. Clinical studies based on targeting metabolic abnormalities and biomarkers demonstrate significant benefits, but always an element of disease remains which is resistant to treatment. Recent evidence has strongly implicated an early interaction of atherogenic lipoproteins with vascular matrix proteoglycans as the initiating step in atherogenesis. Expert commentary has pointed to the need for vascular directed therapies to provide reductions in the residual disease component. We propose that the regulation of synthesis and thus structure of glycosaminoglycans on proteoglycans provides a potential pathway to this reduction. We review existing evidence that the vascular synthesis of glycosaminoglycan chains can be regulated in a manner which reduces lipoprotein binding and the potential application of this strategy to attenuation of the current cardiovascular disease pandemic.
Collapse
Affiliation(s)
- M L Ballinger
- Cell Biology of Diabetes Laboratory, Division of Vascular Biology, Baker Heart Research Institute, St. Kilda Rd Central, Melbourne, Victoria 8008, Australia
| | | | | | | | | |
Collapse
|
12
|
Simmons ML, Lamborn KR, Takahashi M, Chen P, Israel MA, Berger MS, Godfrey T, Nigro J, Prados M, Chang S, Barker FG, Aldape K. Analysis of complex relationships between age, p53, epidermal growth factor receptor, and survival in glioblastoma patients. Cancer Res 2001; 61:1122-8. [PMID: 11221842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Glioblastoma multiforme (GBM) carries a dismal prognosis. However, a range of survival times exists, and parameters that define prognostic groups may help to optimize treatment. To identify such prognostic groups, we analyzed tumor tissue from 110 cases of newly diagnosed GBM from two clinical protocols. Similar to other studies, we found no association of epidermal growth factor receptor (EGFR) overexpression (as assessed by immunohistochemistry), p53 immunopositivity, or p53 mutation with survival in the entire sample. However, EGFR overexpression showed trends toward worse prognosis in patients younger than the median age, but better prognosis in patients older than the median age. This interaction of EGFR with age group was statistically significant and led us to focus our further analyses on the younger patients. In this group, a statistically significant association of EGFR overexpression with worse survival was identified in the p53-negative but not p53-positive tumors. We found a similar result after screening these cases for mutations in p53: EGFR overexpression was negatively associated with survival only in the p53 wild-type cases. To confirm this unexpected result, this finding was reproduced in a validation sample of an additional 42 tumors from younger patients on the same two clinical protocols. This complex relationship between EGFR and p53 in younger patients remained in a multivariate analysis that incorporated additional prognostic variables. The results suggest that analysis of prognostic markers in GBM is complex, and maximal information may require analysis of subgroups based on age and the status of specific markers such as p53. In addition, they suggest a specific group of patients on which to focus promising therapies targeting EGFR.
Collapse
Affiliation(s)
- M L Simmons
- Department of Pathology, University of California School of Medicine, San Francisco 94143-0506, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Abstract
BACKGROUND The transoral, endoscopic route has been suggested as a possible approach for the correction of severe gastroesophageal reflux. Such a procedure would involve no mobilization of the cardia or other structures. The optimal placement, number, and configuration of sutures remains undefined. METHODS With the use of a previously developed endoscopic sewing machine, this study was undertaken in baboons with two suture arrangements immediately below the lower esophageal sphincter. A linear arrangement (group I) and a circular arrangement (group II) were compared. During the 6 months after the procedure, the animals were evaluated using manometry, fluoroscopic barium swallow, upper gastrointestinal endoscopy, and a pressure volume test. RESULTS A significant increase in lower esophageal sphincter length was demonstrated only in group II (p = 0. 010). A significant increase in lower esophageal sphincter pressure was demonstrated only in group I animals (p = 0.008). The abdominal length increased in group I (p = 0.004) and group II (p = 0.004). The yield pressure and yield volume did not differ significantly from those measured previously in control animals. No evidence of reflux, stricture formation, esophagitis, or other pathology was noted. CONCLUSIONS Some manometric parameters associated with gastroesophageal reflux are altered by the endoscopic placement of sutures below the gastroesophageal junction, with no associated serious complications.
Collapse
Affiliation(s)
- T Martinez-Serna
- Departments of Surgery and Preventive Medicine, Creighton University, Omaha, Nebraska, USA
| | | | | | | | | | | | | | | |
Collapse
|
14
|
Martinez-Serna T, Davis RE, Mason R, Perdikis G, Filipi CJ, Lehman G, Nigro J, Watson P. Endoscopic valvuloplasty for gastroesophageal reflux disease. Gastrointest Endosc 2000; 52:15A. [PMID: 11203437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
|
15
|
Ginzinger DG, Godfrey TE, Nigro J, Moore DH, Suzuki S, Pallavicini MG, Gray JW, Jensen RH. Measurement of DNA copy number at microsatellite loci using quantitative PCR analysis. Cancer Res 2000; 60:5405-9. [PMID: 11034080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
This report describes the development and validation of quantitative microsatellite analysis (QuMA) for rapid measurement of relative DNA sequence copy number. In QuMA, the copy number of a test locus relative to a pooled reference is assessed using quantitative, real-time PCR amplification of loci carrying simple sequence repeats. Use of simple sequence repeats is advantageous because of the large numbers that are mapped precisely. In addition, all markers are informative because QuMA does not require that they be polymorphic. The utility of QuMA is demonstrated in assessment of the extent of deletions of chromosome 2 in leukemias arising in radiation-sensitive inbred SJL mice and in analysis of the association of increased copy number of the putative oncogene ZNF217 with reduced survival duration in ovarian cancer patients.
Collapse
Affiliation(s)
- D G Ginzinger
- Department of Laboratory Medicine, University of California San Francisco Comprehensive Cancer Center, University of California, 94143, USA
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Abstract
This article specifically focuses on arthropods that act as ectoparasites to the human host. A cutaneous eruption caused by the larvae of roundworms is briefly discussed.
Collapse
Affiliation(s)
- T A Angel
- Department of Dermatology, Baylor College of Medicine, Houston, Texas, USA
| | | | | |
Collapse
|
17
|
Velmahos GC, Nigro J, Tatevossian R, Murray JA, Cornwell EE, Belzberg H, Asensio JA, Berne TV, Demetriades D. Inability of an aggressive policy of thromboprophylaxis to prevent deep venous thrombosis (DVT) in critically injured patients: are current methods of DVT prophylaxis insufficient? J Am Coll Surg 1998; 187:529-33. [PMID: 9809571 DOI: 10.1016/s1072-7515(98)00223-3] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND Deep venous thrombosis (DVT) in severely injured patients is a life-threatening complication. Effective and safe thromboprophylaxis is highly desirable to prevent DVT. Low-dose heparin (LDH) and sequential compression device (SCDs) are the most frequently used methods. Inappropriate use of these methods because of the nature or site of critical injuries (eg, brain lesion, solid visceral or retroperitoneal hematoma, extremity fractures) may lead to failure of DVT prophylaxis. STUDY DESIGN A prospective study was performed to evaluate the efficacy of a policy of aggressive use of LDH and SCDs in patients who are at very high risk for DVT. From January 1996 to August 1997, 200 critically injured patients were followed by weekly Doppler examinations to detect DVT at the proximal lower extremities. Only 3 patients did not receive any thromboprophylaxis. SCDs were applied in 97.5% and LDH was administered to 46% of the patients; 45% had both. RESULTS DVT was found in 26 patients (13%). The majority (58%) developed DVT within the first 2 weeks, but new cases were found as late as 12 weeks after admission. The incidence of DVT was the same among patients who had SCDs only or a combination of LDH and SCDs. Mechanism of injury, type and number of operations, site of injury, Injury Severity Score, and the incidence of femoral lines were not different between patients with and without DVT. Differences were found in the severity of injury to the chest and the extremities and the need for high-level respiratory support. Patients with DVT had prolonged ICU and hospital stays (on average, 34 and 49 days, respectively) and a high mortality rate (31%). CONCLUSIONS The incidence of DVT remains high among severely injured patients despite aggressive thromboprophylaxis. A combination of LDH and an SCD showed no advantage over SCD alone in decreasing DVT rates. Risk factors in this group of patients who are already at very high risk are hard to detect; Doppler examinations are justified for surveillance in all critically injured patients. Current methods of thromboprophylaxis seem to offer limited efficacy, and the search for more effective methods should continue.
Collapse
Affiliation(s)
- G C Velmahos
- Department of Surgery, Los Angeles County + University of Southern California Medical Center, 90033-4525, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
Firefly luciferase is inactivated by singlet oxygen at near diffusion controlled rates, 1.9 X 10(9) M-1 s-1, based on direct comparison with the oxidation of L-histidine. The inactivation kinetics are multiphasic. Inactivation is inhibitable by NaN3. Surface-separated-sensitizer (SSS) system in which singlet oxygen is produced above an air gap separating the reaction solution from the Rose Bengal sensitizer, ensuring only Type II reactions, was compared with a Sensitox II system in which the polymer bound Rose Bengal is contained in the reaction solution and both Type I and Type II reactions can occur. A slight stabilization is afforded by MgSO4.
Collapse
|