1776
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Elder E, Chen Z, Ensley A, Nerem R, Brockbank K, Song Y. Enhanced Tissue Strength in Cryopreserved, Collagen-Based Blood Vessel Constructs. Transplant Proc 2005; 37:4625-9. [PMID: 16387185 DOI: 10.1016/j.transproceed.2005.10.033] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Indexed: 11/27/2022]
Abstract
Traditional cryopreservation methods do not adequately preserve complex natural or engineered multicellular tissues due to the ice formation in the extracellular matrices. Vitrification is an alternate ice-free method for cryopreservation. This study compares the effects of vitrification and conventional cryopreservation on an engineered blood vessel construct. Collagen-based vascular constructs were used as models in this study. Tubular constructs were cut into rings and distributed into fresh, frozen, and vitrified groups for evaluation of mechanical properties and cell viability. Passive mechanical tests revealed enhanced tissue strength after both freezing and vitrification. Cryosubstitution studies of frozen and vitrified constructs revealed negligible ice in the vitrified specimens and extensive ice formation in the extracellular matrix of frozen specimens. Morphological changes associated with ice formation were visible within tissues preserved using traditional cryopreservation but not in tissue preserved using vitrification. The metabolic assay results indicated that vitrified tissue had similar viability to fresh controls. These results suggest that the increased tissue strength after cryopreservation may relate to thermal property change during preservation that cross-link collagen in tissue-engineered blood vessels. Further development of this cryopreservation method is necessary to minimize the alteration in material property and maintain cell viability of the constructs.
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1777
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Chen Z, Fadiel A, Naftolin F, Eichenbaum KD, Xia Y. Circulation DNA: biological implications for cancer metastasis and immunology. Med Hypotheses 2005; 65:956-61. [PMID: 16054303 DOI: 10.1016/j.mehy.2005.04.042] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Accepted: 04/28/2005] [Indexed: 11/18/2022]
Abstract
Circulation cell free DNA (cf-DNA) is of considerable interest to oncology researchers seeking to isolate specific cancer markers. Here, we focus on the origin and biological implications of cf-DNA, exploring its potential roles in cancer biology and medicine. We hypothesize that cf-DNA is primarily released by living cancer cells in addition to apoptotic or necrotic cancer cells for three reasons: (1) following radiotherapy, cf-DNA quantities are significantly reduced in a high percentage of patients although radiation-induced massive apoptosis is expected; (2) cancer cell DNA concentration in cultured supernatants increases with cell proliferation when few apoptotic or necrotic cells are present; and (3) DNA concentration increases in normal lymphocyte cultures following stimulation with phytohemagglutinin, lipopolysaccharide or antigen. Our hypotheses have major biological implications in cancer biology. First, cancer cf-DNA may transform normal cells and form adjacent or remote metastases or second primary cancer. In this context, we also have raised an alarming advice that the cancer may be potentially infectious. Secondly, if a normal cf-DNA contains cytokine sequence, it may behave like an intrinsic DNA vaccine, producing therapeutic cytokine. If normal cf-DNA contains a sequence of a non-mutated oncogene or tumor suppressor gene, homologous recombination with the cancer genome may occur leading to knock out mutated oncogene or tumor suppressor gene that could thus elicit a spontaneous remission of cancer.
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1778
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Chen Z, Wang YL, Ye W, Miao ZR, Song QB, Ling F. Multiple intracranial aneurysms as delayed complication of atrial myxoma. Case report and literature review. Interv Neuroradiol 2005; 11:251-4. [PMID: 20584483 DOI: 10.1177/159101990501100309] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2005] [Accepted: 08/25/2005] [Indexed: 11/15/2022] Open
Abstract
SUMMARY We report a case of multiple intracranial aneurysms as delayed complication of atrial myxoma.We reviewed the literature of intracranial myxomal aneurysms, and trying to find reasonable therapy methods, but got the conclusion that neurosurgery and interventional treatment were not helpful, chemotherapy and radiotherapy maybe useful in the treatment of such cases.
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1779
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Chen Z, Bongiorni P, Nath R. Dose rate constant of a Cesium-131 interstitial brachytherapy seed measured by thermoluminescent dosimetry and gamma-ray spectrometry. Med Phys 2005; 32:3279-85. [PMID: 16372409 DOI: 10.1118/1.2098127] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The aim of this work was to conduct an independent determination of the dose rate constant of the newly introduced Model CS-1 131Cs seed. A total of eight 131Cs seeds were obtained from the seed manufacturer. The air-kerma strength of each seed was measured by the manufacturer whose calibration is traceable to the air-kerma strength standard established for the 131Cs seeds at the National Institute of Standards and Technology (1 sigma uncertainty < 1%). The dose rate constant of each seed was measured by two independent methods: One based on the actual photon energy spectrum emitted by the seed using gamma-ray spectrometry and the other based on the dose-rate measured by thermoluminescent dosimeter (TLD) in a Solid Water phantom. The dose rate constant in water determined by the gamma-ray spectrometry technique and by the TLD dosimetry are 1.066 +/- 0.064 cGyh(-1)U(-1) and 1.058 +/- 0.106 cGyh(-1)U(-1), respectively, showing excellent agreement with each other. These values, however, are approximately 15% greater than a previously reported value of 0.915 cGyh(-1)U(-1) [Med. Phys. 31, 1529-1538 (2004)]. Although low-energy fluorescent x rays at 16.6 and 18.7 keV, originating from niobium present in the seed construction, were measured in the energy spectrum of the 131Cs seeds, their yields were not sufficient to lower the dose rate constant to the value of 0.915 cGyh(-1)U(-1). Additional determinations of the dose rate constant may be needed to establish an AAPM recommended consensus value for routine clinical use of the 131Cs seed.
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1780
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Munbodh R, Jaffray D, Moseley D, Chen Z, Knisely J, Duncan J. Automated Three Dimensional Quantification of Setup Deviations in Radiation Therapy Using a Single Portal Image and Cone Beam CT Data. Int J Radiat Oncol Biol Phys 2005. [DOI: 10.1016/j.ijrobp.2005.07.881] [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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1781
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Pal R, Yang M, Lin R, Johnson BN, Srivastava N, Razzacki SZ, Chomistek KJ, Heldsinger DC, Haque RM, Ugaz VM, Thwar PK, Chen Z, Alfano K, Yim MB, Krishnan M, Fuller AO, Larson RG, Burke DT, Burns MA. An integrated microfluidic device for influenza and other genetic analyses. LAB ON A CHIP 2005; 5:1024-32. [PMID: 16175256 DOI: 10.1039/b505994a] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
An integrated microfluidic device capable of performing a variety of genetic assays has been developed as a step towards building systems for widespread dissemination. The device integrates fluidic and thermal components such as heaters, temperature sensors, and addressable valves to control two nanoliter reactors in series followed by an electrophoretic separation. This combination of components is suitable for a variety of genetic analyses. As an example, we have successfully identified sequence-specific hemagglutinin A subtype for the A/LA/1/87 strain of influenza virus. The device uses a compact design and mass production technologies, making it an attractive platform for a variety of widely disseminated applications.
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1782
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Chen Z, Li B, Miao M, Yang G, Yin J, Su Q. Simultaneous Determination of Palladium, Platinum and Rhodium by On-Line Column Enrichment and HPLC with 4-Hydroxy-1-Naphthalthiorhodanine as Pre-Column Derivatization Reagents. Mikrochim Acta 2005. [DOI: 10.1007/s00604-005-0385-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1783
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Li M, Chen Z, Li Y, Ma S, Hu J. Pilot Study To Evaluate the Developmental Potential of Immature Oocytes From Controlled Ovarian Hyperstimulation. Fertil Steril 2005. [DOI: 10.1016/j.fertnstert.2005.07.1100] [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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1784
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Jiang Y, Xue ZH, Shen WZ, Du KM, Yan H, Yu Y, Peng ZG, Song MG, Tong JH, Chen Z, Huang Y, Lübbert M, Chen GQ. Desferrioxamine induces leukemic cell differentiation potentially by hypoxia-inducible factor-1 alpha that augments transcriptional activity of CCAAT/enhancer-binding protein-alpha. Leukemia 2005; 19:1239-47. [PMID: 15902299 DOI: 10.1038/sj.leu.2403734] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We reported recently that cobalt chloride-simulated hypoxia and mild hypoxia modified the differentiation of human acute myeloid leukemic (AML) cells, probably acting via a hypoxia-inducible factor-1 alpha (HIF-1 alpha)-dependent mechanism. In this study, we investigated the effect of desferrioxamine (DFO), an iron chelator with 'hypoxia-mimetic' activity, on the differentiation of AML cells. The results showed that DFO at nontoxic concentrations induced the differentiation of AML cell lines NB4 and U937, as assessed by morphological criteria and differentiation-associated antigens. DFO-induced differentiation parallel to the rapid accumulation of HIF-1 alpha protein in these two cell lines. Of importance, the transient transfection of HIF-1 alpha cDNA induced U937 cells to develop the differentiation-related alterations such as growth arrest and increased CD11b expression. Furthermore, the inducible expression of chromosome translocation t(8;21)-generated leukemogenic AML1-ETO fusion gene attenuated DFO-induced differentiation of U937 cells with the decrease of CCAAT/enhancer-binding protein alpha (C/EBP alpha), a critical factor for granulocytic differentiation. Using immunoprecipitation and luciferase reporter assay, HIF-1 alpha was also shown to interact physically with and to increase the transcriptional activity of C/EBP alpha. Taken together, these results provided novel evidence for a role of HIF-1 alpha in AML cell differentiation, and suggested that C/EBP alpha might be a downstream effector for HIF-1 alpha-mediated differentiation.
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MESH Headings
- Acute Disease
- CCAAT-Enhancer-Binding Protein-alpha/metabolism
- Cell Differentiation/drug effects
- Cell Line, Tumor
- Core Binding Factor Alpha 2 Subunit
- Deferoxamine/pharmacology
- Gene Expression Regulation, Leukemic
- Humans
- Hypoxia-Inducible Factor 1, alpha Subunit
- Leukemia, Myeloid/drug therapy
- Leukemia, Myeloid/metabolism
- Oncogene Proteins, Fusion/biosynthesis
- Oncogene Proteins, Fusion/genetics
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- RUNX1 Translocation Partner 1 Protein
- Transcription Factors/biosynthesis
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Transcription, Genetic
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1785
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Chen Z, Scott Mathews F, Hassan-Abdulah A, Zhao G, Schuman Jorns M. Structure of heterotetrameric sarcosine oxidase (TSOX) at 1.85 Å resolution. Acta Crystallogr A 2005. [DOI: 10.1107/s010876730508880x] [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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1786
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Chen Z, Elnashaie S. Autothermal CFB Membrane Reformer for Hydrogen Production from Heptane. Chem Eng Res Des 2005. [DOI: 10.1205/cherd.04322] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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1787
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Zhu B, Chen Z, Duan Y, Zou L, Wu Y. P-234 MIP-3 alpha gene therapy intiated by radiotherapy elicits specific anti-tumor immunity against lung carcinoma. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)80728-7] [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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1788
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1789
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Chen Z, Aston E, Yu MK. Loss of Zap-70 and low molecular weight phosphotyrosine phosphatase occurs after therapy in a patient with B-chronic lymphocytic leukemia. Leukemia 2005; 19:1503-5. [PMID: 15931269 DOI: 10.1038/sj.leu.2403793] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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1790
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Chen L, Zhu J, Xu X, Wang L, Paskalev K, Chen Z, Movsas B, Ma C. SU-FF-J-39: Image Guided Radiation Therapy: Investigation of Interfraction Setup and External Contour Variation for Prostate IMRT Using CT and MRI. Med Phys 2005. [DOI: 10.1118/1.1997585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1791
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Fan J, Luo W, Li J, Fourkal E, Chen Z, Ma C. TH-C-T-617-03: Implementation of Monte Carlo Dose Verification for Proton Therapy QA. Med Phys 2005. [DOI: 10.1118/1.1998669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1792
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Ahmad M, Chen Z, Song H, Lund M, Deng J, Nath R. SU-FF-T-183: Application of a Gantry-Mounted Diode Array System for QA Dosimetry of High-Energy Photon Beams. Med Phys 2005. [DOI: 10.1118/1.1997864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1793
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Song H, Chen Z, Fan Y, Deng J, Ahmad M, Nath R. SU-FF-T-91: Unusually Large Fluctuation of Monitor Unit (MU) Efficiency in Large-Field IMRT Plans Using Sliding-Window Technique. Med Phys 2005. [DOI: 10.1118/1.1997762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1794
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Zhang X, Choe MS, Lee JE, Muller S, Tighiouart M, Rogatko A, Glisson BS, Chen Z, Khuri FR, Shin DM. GRIM-19 expression and its correlation with clinical outcomes of an induction chemotherapy for patients with locally advanced squamous cell carcinoma of the head and neck (SCCHN). J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.5519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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1795
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Yang J, Li J, Chen L, Chen Z, Luo W, Fan J, Stathakis S, Price R, Ma C. TH-C-T-617-10: Monte Carlo Investigation of Heterogeneity Effect for Head and Neck IMRT. Med Phys 2005. [DOI: 10.1118/1.1998676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1796
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Leal A, Ma C, du Plessis F, Lagares JI, Li J, Quin L, Xiong W, Stathakis S, Luo W, Chen Z. MO-E-T-617-01: Energy and Intensity Modulated Electron Radiation Therapy Using a Monte Carlo Optimization Procedure. Med Phys 2005. [DOI: 10.1118/1.1998305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1797
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Chen Z, Deng J, Song H, Fan Y, Ahmad M, Bond J, Chui C, Haffty B, Nath R. SU-FF-T-80: Incorporation of Isodose-Level Control to a Simplified Intensity-Modulated Radiation Therapy (sIMRT) Technique for Whole Breast Radiotherapy. Med Phys 2005. [DOI: 10.1118/1.1997751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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1798
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Popat S, Pan H, Shao Y, Zhao D, Chen Z, Houlston RS. A prospective blinded study of microsatellite instability (MSI) as a marker of overall survival (OS) in the adjuvant treatment of colorectal cancer (CRC) patients. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.9544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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1799
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Chen Z, Elnashaie S. Bifurcation Behaviour During the Hydrogen Production in Two Compatible Configurations of a Novel Circulating Fluidized Bed Membrane Reformer. Chem Eng Res Des 2005. [DOI: 10.1205/cherd.04365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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1800
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Chen Y, Zhao Y, Chen Z, Liao M. Phase II clinical trial on docetaxel in the treatment of non-small-cell lung cancer (NSCLC). J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.7352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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