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Yu X, Fan C, Shan Z, Teng X, Guan H, Li Y, Teng D, Jin Y, Chong W, Yang F, Dai H, Yu Y, Li J, Chen Y, Zhao D, Shi X, Hu F, Mao J, Gu X, Yang R, Tong Y, Wang W, Gao T, Li C, Teng W. A five-year follow-up study of goiter and thyroid nodules in three regions with different iodine intakes in China. J Endocrinol Invest 2008; 31:243-50. [PMID: 18401207 DOI: 10.1007/bf03345597] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVE The association between iodine status and the prevalence of goiter and thyroid nodules has been well established but the extent to which different iodine intake levels influence the incidence of goiter and thyroid nodules is unclear. The aim of the study was to determine the incidence of goiter and thyroid nodules in 3 regions with different iodine intake levels: mildly deficient, more than adequate, and excessive. DESIGN, PATIENTS AND MEASUREMENTS Of the 3385 unselected subjects enrolled in 1999 in Panshan, Zhangwu, and Huanghua where median urinary iodine excretion (UIE) was 83.5 microg/l, 242.9 microg/l, and 650.9 microg/l, respectively, 2708 (80.0%) participated in the follow-up study in 2004. The examinations of thyroid ultrasonography, thyroid function, thyroid autoantibodies and UIE were performed at baseline and follow-up. RESULTS The cumulative incidence of diffuse goiter was 7.1%, 4.4%, and 6.9%, respectively, higher in Panshan and Huanghua than in Zhangwu (p=0.013 and p=0.015) and that of nodular goiter was 5.0%, 2.4%, and 0.8%, respectively, declining with increasing iodine intake levels (p<0.001). Mild iodine deficiency, chronic iodine excess as well as positive thyroid autoantibodies were associated with the occurrence of goiter [Logistic regression: odds ratio (OR)=1.83 (95% confidence interval (CI) 1.26-2.65), OR=1.46 (95% CI 1.01-2.11) and OR=1.68 (95% CI 1.14-2.48), respectively]. The cumulative incidence of single nodule was 4.0%, 5.7%, and 5.6%, respectively and that of multiple nodules was 0.4%, 1.2%, and 1.0%, respectively. CONCLUSIONS The relationship between iodine and the risk for the occurrence of diffuse goiter shows a U-shaped curve. Nodular goiters are more prevalent in iodine-deficient areas.
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Kirtley JR, Deng Z, Luan L, Yenilmez E, Dai H, Moler KA. Moment switching in nanotube magnetic force probes. NANOTECHNOLOGY 2007; 18:465506. [PMID: 21730480 DOI: 10.1088/0957-4484/18/46/465506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Magnetic images of high density vertically recorded media using metal-coated carbon nanotube tips exhibit a doubling of the spatial frequency under some conditions (Deng et al 2004 Appl. Phys. Lett. 85 6263). Here we demonstrate that this spatial frequency doubling is due to the switching of the moment direction of the nanotube tip. This results in a signal which is proportional to the absolute value of the signal normally observed in MFM. Our modeling indicates that a significant fraction of the tip volume is involved in the observed switching, and that it should be possible to image high bit densities with nanotube magnetic force sensors.
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Tollenaar R, Marijnen C, Morreau H, Kuppen P, van Velthuysen M, He Y, Dai H, van 't Veer L. 3007 ORAL Molecular profiles provide clinical meaningful outcome prediction in stage II colon cancer. EJC Suppl 2007. [DOI: 10.1016/s1359-6349(07)70935-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Wang Y, Dai H, Liu Z, Cheng X, Tellides G, Dai Z. Neutralizing IL-7 promotes long-term allograft survival induced by CD40/CD40L costimulatory blockade. Am J Transplant 2006; 6:2851-60. [PMID: 17062001 DOI: 10.1111/j.1600-6143.2006.01550.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Memory T cells are somewhat resistant to immunosuppresion. They therefore pose a threat to inducing long-term allograft survival. IL-7 is essential for memory T-cell generation. Here, we investigated whether neutralizing IL-7 promotes allograft survival. We found that neutralizing IL-7 alone did not significantly prolong allograft survival. However, blocking both IL-7 and CD154 signaling synergistically prolonged allograft survival. In contrast, neutralizing IL-2 failed to further prolong allograft survival induced by CD40/CD154 costimulatory blockade. Allospecific memory CD8+ T-cell generation was severely impaired under the treatment of anti-IL-7 plus anti-CD154 Ab while administering recombinant IL-7 enhanced CD8+ memory generation even under donor-specific transfusion plus anti-CD154 Ab treatment. Neutralizing IL-7, but not IL-2, together with blocking CD154 synergistically suppressed the proliferation of naïve/effector CD8+ T cells infiltrating grafts. Nevertheless, neutralizing IL-7 did not alter regulatory T-cell generation while neutralizing IL-2 suppressed their generation. Hence, targeting IL-7 represents a new strategy to prolong allograft survival by acting on both naïve and memory T cells. Long-term allograft survival may be achieved by neutralizing IL-7 plus CD40/CD154 blockade, since CD40/CD154 costimulatory blockade prevents acute rejection while neutralizing IL-7 suppresses the generation of memory T cells that persist and mediate late or chronic rejection.
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Serrero G, Tkaczuk K, Tait N, Golubeva O, Dai H, Feldman FS, Jones L. Circulating levels of the breast cancer growth factor GP88 in the serum of breast cancer (BC) patients. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.20050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
20050 Background: The 88 kDa autocrine growth factor PC-Cell Derived Growth Factor (GP88) plays a critical role in breast tumorigenesis. GP88 expression was low in estrogen receptor positive cells, whereas in ER negative cells, it was constitutively overexpressed. Increased GP88 expression was associated with anti-estrogen therapy resistance in ER+ cells and Herceptin resistance in Her-2 overexpressing breast tumors. Antisense inhibition of GP88 expression in human breast adenocarcinoma lead to inhibition of tumor growth in vivo. Immunohistochemical studies have shown that GP88 was expressed in 80% of invasive ductal carcinomas in correlation with expression of poor prognosis markers whereas normal tissues and benign breast lesions were negative. Since GP88 is secreted by breast cancer cells, we examined whether GP88 was found in the circulation at an elevated level in the sera of breast cancer patients when compared to healthy individuals. Methods: A blood sampling study was conducted to determine the serum level of GP88 in healthy volunteers (HV) and breast cancer patients (BC pts). Ten ml of blood was drawn every three months to obtain serum. GP88 serum concentration was determined in triplicate by quantitative enzyme immunoassay using human GP88 as standard. 126 BC pts were accrued. . In addition, sera from 53 healthy volunteers were obtained to establish a GP88 baseline in HV. BC pts characteristics: race: Caucasian- 61, African American-60, Asian-5; median age: 52.5 (range 26–84), stage I-32, II-34, III-18, IV-42. Results: Circulating GP88 was measurable in the serum. Median level of GP88 was 32.8 ng/ml (range 15.3–42.8) in HV and 43.8 ng/ml (range 15.4–158.4) in BC pts, (p-value = 0.0007). Conclusions: GP88 is measurable in the sera of HV and BC pts. Comparison between the two groups indicates that GP88 level is significantly higher in the sera of BC pts. These studies are important since it identifies GP88 as a measurable biomarker that is also a therapeutic target of malignant transformation or malignant progression of breast carcinoma (BC). Future studies will examine the correlation of GP88 level with BC prognostic factors. Correlation between the serum level of GP88 and therapeutic response to systemic therapy in breast cancer patients will also be assessed. [Table: see text]
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Lau KF, Wang A, Chew K, Dai H, Hastie T, Brandt B, Waldman F, Sninsky J. An RT-PCR-based multi-gene prognostic signature predicts distant metastasis of node negative, ER positive breast cancer from FFPE sections. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
506 Background: Gene expression profiles have been shown to predict distant metastasis risk in breast cancer patients. For routine medical practice, molecular prognostic tests need to be able to quantify metastasis risk with readily available samples and optimally employ regulatory-approved platforms. Methods: 142 early stage, N-, ER+, untreated breast cancer patients were chosen. Mean age was 61.8 (31 - 89) yrs with 72% > 55 yrs. RNA was isolated from 4×10 μm FFPE sections. Using real-time RT-PCR, 200 genes selected from van ‘t Veer et al, Dai et al, Paik et al and additional candidate genes were profiled. Primary endpoint was distant metastasis free survival. A prognostic signature was identified using semi-supervised principal component method. Metastasis score (MS) was calculated from gene expression levels. Results: We identified a unique 15-gene prognostic signature and 3 normalization genes. Probability of metastasis for any time period can be calculated from MS and was evaluated for 2, 5, and 10 yrs. Using median of MS to stratify patients, the high-risk group had a hazard ratio (HR) of 4.1 (95%CI 1.77–9.54, p = 0.001) vs. the low-risk group. 5-yr and 10-yr metastasis free survival rates (std. error) were 0.76 (0.053) and 0.62 (0.064) in the high-risk group and 0.96 (0.025) and 0.90 (0.038) in the low-risk group. Multivariate Cox regression analyses indicated that molecular signature had independent prognostic value with HR of 2.97 (95%CI 1.17 - 7.52, p = 0.022) after adjusting for age, tumor size and grade. Molecular signature was more prognostic in the low-grade subgroup (HR = 6.85, 95%CI 1.81–25.88) than an unstratified analysis. AUC at 5 yr was 0.65 and 0.60 for molecular signature and Adjuvant Online (AO) respectively. The prognosticator combining both had AUC of 0.67. 10-yr metastasis probabilities from MS and AO have low correlation (R2=0.17). Conclusions: A prognostic signature based upon mRNA expression of 15 genes has been identified using FFPE sections with RT-PCR for early stage, N-, ER+ patients. Metastasis score that quantifies distant metastasis risk for any time period, not confounded with any treatment effect, can help clinicians and patients to choose among different therapeutic options. (Lau and Wang contribute equally) [Table: see text]
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Nikitin A, Ogasawara H, Mann D, Denecke R, Zhang Z, Dai H, Cho K, Nilsson A. Hydrogenation of single-walled carbon nanotubes. PHYSICAL REVIEW LETTERS 2005; 95:225507. [PMID: 16384236 DOI: 10.1103/physrevlett.95.225507] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Indexed: 05/05/2023]
Abstract
Towards the development of a useful mechanism for hydrogen storage, we have studied the hydrogenation of single-walled carbon nanotubes with atomic hydrogen using core-level photoelectron spectroscopy and x-ray absorption spectroscopy. We find that atomic hydrogen creates C-H bonds with the carbon atoms in the nanotube walls, and such C-H bonds can be completely broken by heating to 600 degrees C. We demonstrate approximately 65 +/- 15 at % hydrogenation of carbon atoms in the single-walled carbon nanotubes, which is equivalent to 5.1 +/- 1.2 wt % hydrogen capacity. We also show that the hydrogenation is a reversible process.
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Weigelt B, Wessels LFA, Bosma AJ, Glas AM, Nuyten DSA, He YD, Dai H, Peterse JL, van't Veer LJ. No common denominator for breast cancer lymph node metastasis. Br J Cancer 2005; 93:924-32. [PMID: 16189523 PMCID: PMC2361648 DOI: 10.1038/sj.bjc.6602794] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The axillary lymph node status is the most powerful prognostic factor for breast cancer patients to date. The molecular mechanisms that control lymph node metastasis, however, remain poorly understood. To define patterns of genes or gene regulatory pathways that drive breast cancer lymph node metastasis, we compared the gene expression profiles of 15 primary breast carcinomas and their matching lymph node metastases using microarrays. In general, primary breast carcinomas and lymph node metastases do not differ at the transcriptional level by a common subset of genes. No classifier or single gene discriminating the group of primary tumours from those of the lymph node metastases could be identified. Also, in a series of 295 breast tumours, no classifier predicting lymph node metastasis could be developed. However, subtle differences in the expression of genes involved in extracellular-matrix organisation and growth factor signalling are detected in individual pairs of matching primary and metastatic tumours. Surprisingly, however, different sets of these genes are either up- or downregulated in lymph node metastases. Our data suggest that breast carcinomas do not use a shared gene set to accomplish lymph node metastasis.
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Serrero G, Tkaczuk KH, Jones L, Goloubeva O, Tait NS, Feldman FS, Dai H. PC-cell derived growth factor (PCDGF/GP88): A novel circulating biomarker in breast cancer (BC) patients. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.551] [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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110
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Weigelt B, Wessels LFA, Bosma AJ, Glas AM, Nuyten DSA, He YD, Dai H, Peterse JL, van 't Veer LJ. Lymph node metastases display gene expression profiles of their primary breast carcinomas. Breast Cancer Res 2005. [PMCID: PMC4233579 DOI: 10.1186/bcr1158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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111
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Xia K, Wu L, Liu X, Xi X, Liang D, Zheng D, Cai F, Pan Q, Long Z, Dai H, Hu Z, Tang B, Zhang Z, Xia J. Mutation in PITX2 is associated with ring dermoid of the cornea. J Med Genet 2004; 41:e129. [PMID: 15591271 PMCID: PMC1735645 DOI: 10.1136/jmg.2004.022434] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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112
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Abbasi RU, Abu-Zayyad T, Amann JF, Archbold G, Bellido JA, Belov K, Belz JW, Bergman DR, Cao Z, Clay RW, Cooper MD, Dai H, Dawson BR, Everett AA, Fedorova YA, Girard JHV, Gray RC, Hanlon WF, Hoffman CM, Holzscheiter MH, Hüntemeyer P, Jones BF, Jui CCH, Kieda DB, Kim K, Kirn MA, Loh EC, Manago N, Marek LJ, Martens K, Martin G, Matthews JAJ, Matthews JN, Meyer JR, Moore SA, Morrison P, Moosman AN, Mumford JR, Munro MW, Painter CA, Perera L, Reil K, Riehle R, Roberts M, Sarracino JS, Sasaki M, Schnetzer SR, Shen P, Simpson KM, Sinnis G, Smith JD, Sokolsky P, Song C, Springer RW, Stokes BT, Taylor SF, Thomas SB, Thompson TN, Thomson GB, Tupa D, Westerhoff S, Wiencke LR, VanderVeen TD, Zech A, Zhang X. Measurement of the flux of ultrahigh energy cosmic rays from monocular observations by the High Resolution Fly's Eye experiment. PHYSICAL REVIEW LETTERS 2004; 92:151101. [PMID: 15169276 DOI: 10.1103/physrevlett.92.151101] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2002] [Revised: 05/28/2003] [Indexed: 05/24/2023]
Abstract
We have measured the cosmic ray spectrum above 10(17.2) eV using the two air-fluorescence detectors of the High Resolution Fly's Eye observatory operating in monocular mode. We describe the detector, phototube, and atmospheric calibrations, as well as the analysis techniques for the two detectors. We fit the spectrum to a model consisting of galactic and extragalactic sources.
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Dai H, Chen J, Tao Q, Zhu J, Zhang F, Zheng L, Qiu Y. Effects of diltiazem on platelet activation and cytosolic calcium during percutaneous transluminal coronary angioplasty. Postgrad Med J 2003; 79:522-6. [PMID: 13679549 PMCID: PMC1742832 DOI: 10.1136/pmj.79.935.522] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIMS To evaluate effects of diltiazem on platelet hyper-reactivity in situations associated with endothelial injury and their possible relationship to cytosolic calcium concentration. METHODS Blood samples were collected at seven time points from 35 patients undergoing percutaneous transluminal coronary angioplasty (PTCA) who received combined diltiazem and aspirin/ticlopidine therapy or aspirin/ticlopidine therapy alone. Platelet expression of glycoprotein IIb/IIIa and P-selectin, production of thromboxane B(2), and cytosolic calcium concentration were measured, respectively, by whole blood flow cytometry, radioimmunoassay, and fluorospectrophotometry. The effects of diltiazem of different concentrations on expression of glycoprotein IIb/IIIa and P-selectin were also studied in vitro in blood samples from patients with chronic stable angina. RESULTS Of the two treatments, aspirin/ticlopidine therapy did not prevent an acute increase of expression of glycoprotein IIb/IIIa and P-selectin and plasma thromboxane B(2) five minutes and 10 minutes after first inflation and 10 minutes after PTCA, whereas combined diltiazem and aspirin/ticlopidine therapy had a significant inhibitory effect. In the group receiving aspirin/ticlopidine therapy, there was a short term increase of platelet [Ca(2+)](i) immediately after PTCA which was significantly reduced by diltiazem treatment. Expression of glycoprotein IIb/IIIa and P-selectin was significantly inhibited in vitro by diltiazem in the concentration of 200 ng/ml or higher, but not 50 ng/ml. CONCLUSIONS Combined diltiazem and aspirin/ticlopidine therapy significantly inhibited platelet activation that continued in the presence of conventional aspirin/ticlopidine treatment. Antiplatelet effects of diltiazem were probably a consequence of reduction of platelet [Ca(2+)](i) and may only be achieved in higher than therapeutic concentrations.
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Dai H, Chao K. Construction of dual and triple reporter vectors for the imaging of HIF-1α expression in vivo. Int J Radiat Oncol Biol Phys 2002. [DOI: 10.1016/s0360-3016(02)03260-1] [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]
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115
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Dai H. [Immunological classification of 112 adult acute leukemia patients]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2001; 22:633-5. [PMID: 16200710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
OBJECTIVE To explore the criteria and significance of immunological classification in adult acute leukemias. METHODS One or two color monoclonal antibodies directly labeled with immunofluorescence were used to analyse the surface and cytoplasma antigens by flow cytometry, and an antibody integral system was developed for the immunologic classification. RESULTS One hundred and twelve adult acute leukemia cases were detected. (1) The undifferentiated phenotype account for 0.9%, simple 51.8%, variant 38.4% and mixed lineage 8.9%. (2) The abnormal expressions of antigen in variant and mixed lineage phenotype were CD7, CD33, CD10, CD13, CD19 and CD20, by order of decreased level. CONCLUSION The strict, numerical diagnostic criteria was very convenient and useful for immunophenotyping of adult acute leukemia.
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Chen Y, An J, Ding Y, Dai H, Mao Q, Feng L, Liu B, Chang Y, Chen F, He H, Tang H, Chang Z, Rao Z. Preliminary X-Ray Crystallographic Studies Of The Mycobacterium Tuberculosis Hsp16.3 Molecular Chaperone. Protein Pept Lett 2001. [DOI: 10.2174/0929866013409111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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117
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Shim M, Javey A, Kam NW, Dai H. Polymer functionalization for air-stable n-type carbon nanotube field-effect transistors. J Am Chem Soc 2001; 123:11512-3. [PMID: 11707143 DOI: 10.1021/ja0169670] [Citation(s) in RCA: 244] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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118
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Kong J, Yenilmez E, Tombler TW, Kim W, Dai H, Laughlin RB, Liu L, Jayanthi CS, Wu SY. Quantum interference and ballistic transmission in nanotube electron waveguides. PHYSICAL REVIEW LETTERS 2001; 87:106801. [PMID: 11531494 DOI: 10.1103/physrevlett.87.106801] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2001] [Indexed: 05/23/2023]
Abstract
The electron transport properties of well-contacted individual single-walled carbon nanotubes are investigated in the ballistic regime. Phase coherent transport and electron interference manifest as conductance fluctuations as a function of Fermi energy. Resonance with standing waves in finite-length tubes and localized states due to imperfections are observed for various Fermi energies. Two units of quantum conductance 2G(0) = 4e(2)/h are measured for the first time, corresponding to the maximum conductance limit for ballistic transport in two channels of a nanotube.
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Wang Z, Zhang H, Dai H. [Study on the elimination of bacterial endotoxins by ultrafiltration device]. WEI SHENG YAN JIU = JOURNAL OF HYGIENE RESEARCH 2001; 30:315-6, 318. [PMID: 12561604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
An external-pressed polysulfone hollow fiber UF membrane, was made by phase inversion method. The cutoff molecular weight was 6000. The water permeation rate of this membrane module (psi 90 x 500 mm) is more than 150 L/hr.atm. The operating results show that the elimination of bacterial endotoxins by this membrane has reached the national standard in pharmacopoeia, and this technology is worthy to be extended over to medical industry. In addition, the essence of pyreotogen, the quantification units and measure methods for pyreotogen, and the operating conditions of UF device in the process of eliminating pyreotogen are introduced. Some critical points in operation was discussed.
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120
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Zhu H, Sun Z, Dai H. [Study on the immunologic function of lymphocyte in cord blood]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2001; 22:423-5. [PMID: 11718094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVE To explore immunologic function of T lymphocytes in human cord blood (HUCB) and provide theoretical basis for clinical application of HUCB. METHODS Immunophenotype and co-stimulated molecules were detected by flow-cytometry using a panel of double labelled McAb, intracellular cytokines (interferon-gamma, interleukin-4) secreted by T lymphocytes by micro-culture of whole blood, and CD25 expression of T lymphocyte by PHA stimulation. T lymphocytes from adult peripheral blood (PB) were used as control. RESULTS There are a higher CD4+/CD8+ ratio of T subset and a lower percentage of CD8+ lymphocytes in HUCB than that in adult PB (P < 0.01), and more than 90% of HUCB T-cells co-expressed CD45RA naive antigen which was significant higher than the percentage in adult PB (P < 0.01). The percentages of IFN-gamma and IL-4-producing CD4+ and CD8+ T cells from HUCB were lower than that of the control group. T cells in HUCB were able to be activated by PHA, but the phases of activation differed from adult PB T cells. CONCLUSIONS It suggested that the low ability to secret cytokines and high percentage of naive T cells might be responsible for the decreased incidence of acute and chronic GVHD and provided possible explanation for the clinical result in HUCB transplantation. T cells in HUCB is a potential resource of adoptive immunotherapy.
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Lü Q, Lü S, Wang M, Ye F, Liu R, Zhu H, Dai H. [Detection of telomerase activity in laryngeal carcinoma and the association between telomerase activity and lymphatic metastasis]. LIN CHUANG ER BI YAN HOU KE ZA ZHI = JOURNAL OF CLINICAL OTORHINOLARYNGOLOGY 2001; 15:360-2. [PMID: 12541904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the telomerase activity in human laryngeal squamous cell carcinomas (LSCC) and the association between telomerase activity and lymphatic metastasis. METHOD Telomerase activity was determined in 47 specimens of LSCC and 10 specimens of laryngeal inflammatory polyps using PCR-ELISA. RESULT Telomerase activity was detected in 39 of 47 (83%) LSCC, but was not detected in all 10 laryngeal inflammatory polyps. There were significant differences between them (P < 0.01). Telomerase activation in LSCC with positive cervical lymph node involvement appeared to be higher (13 out of 13 cases, 100%) than in LSCC with negative cervical lymph node involvement (26 out of 34, 76.47%), (P < 0.05). CONCLUSION Telomerase is activated frequently in LSCC and may become a biomarker of LSCC. The detection of telomerase activity in LSCC may have some value for predicting metastasis potential and prognosis and can guide the clinical practices applying selective neck dissection.
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Shang M, Wang C, Dai H. [Changes in respiratory and circulatory function during sequential invasive-noninvasive mechanical ventilation]. ZHONGHUA JIE HE HE HU XI ZA ZHI = ZHONGHUA JIEHE HE HUXI ZAZHI = CHINESE JOURNAL OF TUBERCULOSIS AND RESPIRATORY DISEASES 2001; 24:487-9. [PMID: 11718041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVE To investigate the change of respiratory and circulatory function in COPD during sequential invasive-noninvasive mechanical ventilation. METHODS 12 COPD patients with type II respiratory failure were ventilated via endotracheal intubation. When pulmonary infection was under control (the appearance of "PIC Window"), all patients were extubated and received mask ventilation. The parameters of hemodynamics oxygenation and esophageal pressure were measured during endotracheal ventilation and mask ventilation (3 hrs after extubation). RESULTS The change of respiratory and circulatory parameters were not significantly different between invasive mechanical ventilation and noninvasive mechanical ventilation (P > 0.05). CONCLUSION The respiratory and circulatory function of COPD patients remained stable during sequential invasive-noninvasive mechanical ventilation.
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Feng C, Dai H, Wu S. [Stress response of Nilaparvata lugens at high temperature and activities of its protective enzyme systems]. YING YONG SHENG TAI XUE BAO = THE JOURNAL OF APPLIED ECOLOGY 2001; 12:409-13. [PMID: 11758425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The nymphae and different wing-form adults of Brown Planthopper (BPH) were treated intermittently at 34 degrees C, 36 degrees C and 38 degrees C. During the process of heat shock treatment, the variation of the activities of the endogenous enzymes of protective system and the content of lipid peroxides (LPO) in BPH were researched. The results showed that the effect of heat shock treatments on CAT activity in 4th instar of nymphae was higher than that in 3rd and 5th instar. The CAT activity in BPH adults increased with the day-age, and 36 degrees C was the suitable temperature at which H2O2 was scavenged by CAT. The GSH-px activity was higher in old than that in young nymphae, and the ability of GSH-px to scavenge H2O2 was higher in old adults than in those adults emerged early. The activity of SOD had a positive correlation with the treated temperatures, and decreased with the increase of nymphae instar and the day-age of adults after emergence at the same temperature. The activities of CAT, GSH-px, and SOD in macropterous adults were higher than those in brachypterous adults. There were no significant difference for the activities of CAT, GSH-px and SOD between female and male adults (alpha > 0.05). The content of LPO in BPH increased with the rise of treated temperature, and also increased with the increase of instars in nymphae and day-age after emergence in adults at the same temperature. The LPO content was higher in brachypterous than in macropterous adults.
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Zhang H, Zhang S, Dai H. [Validation and comparison of ISO standard method for the examination of fluoride in drinking water]. WEI SHENG YAN JIU = JOURNAL OF HYGIENE RESEARCH 2001; 30:182-4. [PMID: 12525097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The validation of ISO standard method for the examination of fluoride in drinking water was introduced. The test for compensating interference, standard curves, accuracy, precision and the minimum detection limit etc were included. The comparison between ISO method and others was made. The results indicated that the ISO method was better in anti-interference, wider linear range and higher precision. The points designed were reasonable. The method is superior to other methods in the same kind, and it should be adopted and extended.
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Chen RJ, Zhang Y, Wang D, Dai H. Noncovalent sidewall functionalization of single-walled carbon nanotubes for protein immobilization. J Am Chem Soc 2001; 123:3838-9. [PMID: 11457124 DOI: 10.1021/ja010172b] [Citation(s) in RCA: 1352] [Impact Index Per Article: 58.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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