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Azuma E, Nagai M, Qi J, Umemoto M, Hirayama M, Kumamoto T, Hiratake S, Komada Y, Sakurai M. CD4+ T-lymphocytopenia in long-term survivors following intensive chemotherapy in childhood cancers. MEDICAL AND PEDIATRIC ONCOLOGY 1998; 30:40-5. [PMID: 9371388 DOI: 10.1002/(sici)1096-911x(199801)30:1<40::aid-mpo11>3.0.co;2-c] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND It is generally believed the effects of short intensive courses of therapy are rapidly reversible in childhood cancers, and immunologic function following years of maintenance treatment with chemotherapy usually returns to normal by 6 months or less when treatment is terminated. However, we previously demonstrated that dysregulation of immunoglobulins, especially IgD, was observed in long-term survivors following intensive chemotherapy in cancer patients. With regard to cellular immunity, investigators reported that antineoplastic chemotherapy significantly reduces the number of CD4+ T-lymphocytes, and production of newly developing CD4+ T-lymphocytes was inversely related to the patients' age. However, the incidence of CD4+ lymphocytopenia in long-term survivors of childhood cancers is not known. PROCEDURE Here, we report the flow cytometric analysis of peripheral blood from long-term survivors who continue complete remission off chemotherapy for more than 5 years. RESULTS Six out of 74 long-term survivors (8.1%), showed low CD4+ T-lymphocyte count (<300/mm3). Three of six patients showed continued CD4+ T-lymphocytopenia over a year. In spite of the persistent low levels of CD4+ T cells, these three patients were not susceptible to severe infections. COMMENT Intriguingly, in patients with CD4+ T-lymphocytopenia there has been a tendency toward increased numbers of natural killer cells or gamma delta T cells that may be operating as a thymus-independent compensatory mechanism to defend the hosts.
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Azuma E, Nishihara H, Qi J, Nagai M, Hiratake S, Zhang XL, Komada Y, Hamazaki M, Sakurai M. Thymic B-cell non-Hodgkin's lymphoma in a child. Am J Hematol 1998; 57:48-50. [PMID: 9423816 DOI: 10.1002/(sici)1096-8652(199801)57:1<48::aid-ajh8>3.0.co;2-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A 13-year-old male developed thymic non-Hodgkin's lymphoma. Microscopically, the tumor was composed of large cells, resembling centroblasts. Immunohistochemically, the tumor demonstrated leukocyte common antigen+, L26 (B-cell)+, UCHL1 (T-cell)-, suggesting the B-cell phenotype. In contrast to the terminally differentiated phenotype (CD10-, surface immunoglobulin-) observed in adult cases, flow cytometric analysis showed that they were relatively immature: CD10+, CD19+, HLA-DR-, IgM+/-, kappa+. He was successfully treated with intensive chemotherapy. Since childhood thymic lymphomas are exclusively small non-cleaved cell lymphoma with T-cell phenotype, this case represents a unique entity in children.
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228
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Liu L, Liu F, Yang C, Qi Y, Yang L, Qi J, Xu Y. [Effects of cytokines on multidrug-resistance in K562/A02 cells]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 1997; 18:646-8. [PMID: 15625765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
OBJECTIVE To explore the effects of cytokines on human leukemic cell line K562/S and its multidrug-resistant counterpart K562/A02. METHODS The toxicities of cytokines and the IC50 (the concentration causing 50% inhibition of cell growth) of DNR were assayed by MTT method; intracellular drug concentration was measured by fluorometry; p-glycoprotein (p-gp) expression was detected by APAAP and mdr-1 mRNA was assayed by RT-PCR. RESULTS The IC50 of DNR for K562/A02 and K562/S cells were 45.08 microg/ml and 0.607 microg/ml, respectively. Pretreating K562/A02 cells with rhu IFN (500 U/ml) or rhu IL-2 (250 U/ml) for 24 hours partially restored the sensitivity of K562/A02 cells to DNR (IC50 were 16.39 and 11.96 microg/ml, respectively) but had not effect on K562/S cells, and it elevated the intracellular DNR accumulation in K562/A02 from 2151 ng/mg x protein to 2570 and 2503ng/mg x protein, respectively. p-gp and mdr-1 mRNA were not down regulated. By contrast, rhu G-CSF and rhu GM-CSF had no effect on either K562/A02 or K562/S. CONCLUSION rhu IFN or rhu IL-2 could partially restore the sensitivity of K562/A02 to DNR and elevate the intracellular DNR accumulation via a mechanism independent of p-gp or mdr-1 mRNA down-regulation.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- ATP Binding Cassette Transporter, Subfamily B, Member 1/pharmacology
- Cytokines/pharmacology
- Dose-Response Relationship, Drug
- Doxorubicin/pharmacology
- Drug Resistance, Multiple/drug effects
- Drug Resistance, Neoplasm/drug effects
- Gene Expression Regulation, Neoplastic/drug effects
- Humans
- Inhibitory Concentration 50
- Intracellular Space/drug effects
- Intracellular Space/metabolism
- K562 Cells
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
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229
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Wang H, Dong X, Qi J. [A digital filter method for the elimination of 50 Hz interference from the ECG]. ZHONGGUO YI LIAO QI XIE ZA ZHI = CHINESE JOURNAL OF MEDICAL INSTRUMENTATION 1997; 21:327-336. [PMID: 11189263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The author uses improved Levkov method to remove 50 Hz interference from ECG signal so that filtered QRS wave can be exactly regarded as the mark identifying other physiological signals' characteristics points, and the paper presented the result of the cancelling.
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230
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Qi J, Goralnick S, Kreutzer DL. Fibrin regulation of interleukin-8 gene expression in human vascular endothelial cells. Blood 1997; 90:3595-602. [PMID: 9345043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Recent studies in our laboratory, as well as others, have suggested that fibrin can regulate cell function in vitro and likely control inflammation in vivo by acting as a potent cell activator. This has led us to hypothesize that during tissue and vascular injury, fibrin can enhance leukocyte recruitment by inducing vascular endothelial cell expression of leukocyte chemotactic factors. To begin to test this hypothesis, we developed an in vitro model of in situ fibrin polymerization on human umbilical vein endothelial cell culture (HUVEC) and determined the ability of fibrin to induce HUVEC expression of the potent leukocyte chemotactic factor interleukin-8 (IL-8). Our initial studies showed that fibrin induced IL-8 expression in a time- and dose-dependent fashion. Fibrin-induced IL-8 expression in HUVEC could be seen as early as 2 hours post-fibrin stimulation. Additionally, fibrin concentrations as low as 30 microg/mL stimulated a detectable level of IL-8 antigen expression from HUVEC. We also showed that this fibrin induced IL-8 had the identical molecular weight and similar antigenic identity as recombinant and monocyte derived IL-8. Northern blot analysis showed that the IL-8 antigen increase seen in fibrin treated HUVEC was due to fibrin induced elevation of steady state mRNA expression in HUVEC. These data clearly support our hypothesis that fibrin is a potent vascular endothelial cell (VEC) activator that can directly contribute to leukocyte recruitment and activation by inducing leukocyte chemotactic factor expression from VEC.
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231
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Tang J, Qi J, White PF, Wang B, Wender RH. Eltanolone as an alternative to propofol for ambulatory anesthesia. Anesth Analg 1997; 85:801-7. [PMID: 9322459 DOI: 10.1097/00000539-199710000-00016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
UNLABELLED The intravenous (i.v.) steroid anesthetic, eltanolone, compares favorably to propofol with respect to its induction characteristics. This double-blind investigation was designed to compare the induction and recovery profile of eltanolone (versus propofol) when it was used for both induction and maintenance of ambulatory anesthesia. Eighty-three consenting ASA physical status I-III outpatients undergoing minor gynecologic or urologic procedures lasting 10-40 min were randomly assigned to one of three anesthetic treatment groups. All patients received midazolam, 2 mg i.v., and fentanyl, 50 micrograms i.v., before induction of anesthesia. The control group (Group 1) was induced with propofol, 2.4 mg/kg i.v. (18-60 yr or ASA physical status I or II) or 1.6 mg/kg i.v. (61-80 yr and/or ASA physical status III), followed by intermittent bolus doses of 0.6 mg/kg i.v. in combination with N2O 67% for maintenance of anesthesia. In Group 2, anesthesia was induced with eltanolone, 0.75 mg/kg i.v., (18-60 yr and/or ASA physical status I or II) or 0.5 mg/kg i.v. (61-80 yr and/or ASA physical status III), and maintained with intermittent bolus injections of 0.2 mg/kg i.v. and N2O 67%. Group 3 received eltanolone, 1.0 mg/kg i.v. (18-60 yr and/or ASA physical status I or II), or 0.75 mg/kg i.v. (61-80 yr and/or ASA physical status III), followed by intermittent bolus injections of 0.2 mg/kg i.v. and N2O 67%. In addition to recording the induction and recovery times and side effects, psychomotor testing was performed before and at 30-min intervals after anesthesia. Induction times (57 +/- 23, 67 +/- 26, and 61 +/- 22s, respectively) were similar in all three groups. Although eltanolone produced no pain on injection (versus 52% in the propofol group), 10% of the eltanolone-treated patients (versus none in the propofol group) developed transient cutaneous (rash-like) reactions. The total dose of study medication used during the anesthetic period was 9.2 +/- 3.7 mg.kg-1.h-1 in the propofol group compared with 3.3 +/- 1.4 mg.kg-1.h-1 and 3.3 +/- 1.9 mg.kg-1.h-1 in Groups 2 and 3, respectively. Early recovery times were significantly shorter after propofol anesthesia. However, times to ambulation, micturition, and being judged "fit for discharge," as well as recovery of cognitive function, were similar in all three groups. Although ethanolone seems to be a safe and effective i.v. anesthetic, these data suggest that it is unlikely to replace propofol in the ambulatory setting. IMPLICATIONS Eltanolone is an investigational steroid anesthetic that causes less pain on injection and less cardiovascular depression than propofol (the most widely used intravenous anesthetic in the outpatient setting). Unfortunately, emergence from anesthesia after ambulatory surgery is slower with eltanolone compared with propofol. Therefore, it is unlikely that eltanolone will replace propofol for outpatient anesthesia.
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232
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Umemoto M, Azuma E, Hirayama M, Nagai M, Hiratake S, Qi J, Kumamoto T, Komada Y, Sakurai M. Two cytotoxic pathways of natural killer cells in human cord blood: implications in cord blood transplantation. Br J Haematol 1997; 98:1037-40. [PMID: 9326208 DOI: 10.1046/j.1365-2141.1997.3183135.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Using K562 cells as a target we investigated cord blood (CB)-natural killer (NK) cytolytic pathways. The cytotoxicity of fresh CB-NK cells was significantly lower than that of peripheral blood mononuclear cells (PB MNCs). When CB was incubated with IL-2, the level of CB-NK cytotoxicity was increased and boosted to the level observed in PB-NK cells. Fresh CB-NK cells induced apoptosis in target cells. Activated CB cells induced apoptosis and necrosis in target cells, at the same level as PB MNCs. CB stem cell transplantation may also induce graft-versus-host disease (GVHD)/graft-versus-leukaemia (GVL), similar to bone marrow transplantation.
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233
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Hu B, Zuo D, Yang C, Wu Y, Zhu B, Xu Y, Qi J, Wang J, Zhou X. [Effects of antisense oligodeoxynucleotides targeting multidrug resistance gene on resistant cell line K562/ AO2]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 1997; 18:425-8. [PMID: 15625850 DOI: pmid/15625850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To investigate the reversal effect of antisense oligodeoxynucleotide on human multidrug-resistant leukemic cell line K562/AO2. METHODS Antisense oligodeoxynucleotides (AOD) targeting-6 approximately 9 sites of exon 2 in human multidrug resistance gene(mdr-1), one of which is sequence-strict-complied and linked with polyethyleneglycol (PEG) at 5' end (AP, 15 mer), the other lacks nucleotide complied site-1 (AP', 14mer), were synthesized. AP, AP' and verapamil were simultaneously added to human mdr-1-mRNA positive leukemia cell line K562/AO2 and, mdr-1-mRNA and p170 were detected. AS' and AP'were labelled by FITC and designated as ASF' and APF', respectively. In addition, the intracellular concentration of them was detected by FACS. RESULTS AP' significantly enhanced the sensitivity of K562/AO2 to DOX, down-regulated the expression of mdr-1 and MRP-mRNA and p170, elevated the intracellular concentration of the two AOD, while AP had no effect. The uptake of APF' was significantly higher than that of ASF' in K562/AO2, and the fluorescence was observed in the plasma and nuclear of K562/AO2 cells. CONCLUSION (AOD targeting mdr-1 promoted the drug sensitivity of drug-resistant tumor cells. 2 AOD had no cytotoxicity to tumor cells. 5 Low molecule PEG enhanced significantly the uptake of AOD by tumor cells.
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234
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Contrino J, Goralnick S, Qi J, Hair G, Rickles FR, Kreutzer DL. Fibrin induction of tissue factor expression in human vascular endothelial cells. Circulation 1997; 96:605-13. [PMID: 9244233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND For the present study, we hypothesized that fibrin is an inducer of tissue factor (TF) expression in vascular endothelial cells in vitro and in vivo. METHODS AND RESULTS To test the in vitro aspect of this hypothesis, human umbilical vein endothelial cells (HUVECs) were cocultured with physiologically relevant concentrations of fibrin (0.03 to 1.0 mg fibrin/mL) for various times (0.5 to 24 hours), and TF expression was compared with that in unstimulated HUVECs (media control). Results demonstrated that fibrin induced a time- and dose-dependent increase in TF antigen expression, functional TF procoagulant activity, and TF mRNA in HUVECs. CONCLUSIONS These studies demonstrate that fibrin can directly regulate TF expression in HUVECs in vitro.
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235
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Azuma E, Masuda S, Qi J, Kumamoto T, Hirayama M, Nagai M, Hiratake S, Umemoto M, Komada Y, Sakurai M. Cytotoxic T-lymphocytes recognizing P-glycoprotein in murine multidrug-resistant leukemias. Eur J Haematol 1997; 59:14-9. [PMID: 9260576 DOI: 10.1111/j.1600-0609.1997.tb00954.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A multidrug-resistant murine lymphoid leukemia P388/ADR overexpresses P-glycoprotein (P-gp), an active transporter that pumps cytotoxic drugs out of cells and a product of mdr1 gene. Cytotoxic T lymphocytes (CTL) that showed cytotoxicity against P388/ADR were generated from mixed lymphocyte tumor cell culture. CTL do not kill drugsensitive parental P388 (P388/parent) that does not express P-gp. Monoclonal antibody against P-gp inhibited cytotoxic activity. Similar results were obtained in another multidrug-resistant cell line P388/VP-16. Cytotoxic activity was mediated by Thy1+ CD4- CD8+ T-cells. When P388/ADR was treated with murine IL-4, expression of P-gp was downregulated. Monoclonal antibody against interleukin-4 (IL-4) abrogated the IL-4-induced suppression of P-gp. Cytolytic activity of CTL against IL-4-treated P388/ADR was dose dependently inhibited. These results suggest that P-gp is immunogenic and can be a target of CTL in this murine leukemia model.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/immunology
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Animals
- Cytotoxicity, Immunologic
- Dose-Response Relationship, Immunologic
- Down-Regulation
- Drug Resistance, Multiple
- Drug Resistance, Neoplasm
- Immunity, Cellular
- Interleukin-4/pharmacology
- Leukemia, Experimental/immunology
- Mice
- T-Lymphocytes, Cytotoxic/immunology
- Tumor Cells, Cultured
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236
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Guo Y, Qi J, Wang M, Wu L, Chang Y, Guo J, Dong J, Mo Y, Zheng L. [Discovery of a novel reassortant H1N2 influenza virus]. ZHONGHUA SHI YAN HE LIN CHUANG BING DU XUE ZA ZHI = ZHONGHUA SHIYAN HE LINCHUANG BINGDUXUE ZAZHI = CHINESE JOURNAL OF EXPERIMENTAL AND CLINICAL VIROLOGY 1997; 11:101-3. [PMID: 15619808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Three strains of influenza A virus were isolated from patients suffering from influenza like disease in Railway Hygiene and Anti-epidemic Station of Taiyuan in January 1996. The identification results by serological method indicated that the isolates were different from H1N2 subtype of influenza A virus isolated from men in 1989 and 1992 and that their HA antigenicity was similar to that of A/RP/8/34 (H1N1) virus, but distinguishable from that of influenza A (H1N1) virus circulating in mans recently. The comparison of migration patterns of the RNA among the isolates, the A/PR//34 (H1N1) and the A/Wuhan/359/95 (H3N2) viruses revealed that the migration patterns of RNA 1-4 segments of the isolates were similar to those of A/PR/8/34 (H1N1) virus, but those of RNA 5-6 segments were indistinguishable from those of A/Wuhan/359/95 (H3N2) strain. However, the migration patterns of RNA 7-8 segments of the isolates were not only different from those of A/PR/8/34 (H1N1) virus, but also distingrasgable from those of A/Wuhan/359/95 (H3N2) strain. Therefore, it could be considered that the isolates were a novel reassortant H1N2 influenza A virus.
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237
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Zhang Y, Song J, Qi J, Lu G. [The plant regeneration of Salvia miltiorrhiza Bge. transformed by Agrobacterium]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1997; 22:274-5, 318. [PMID: 11038957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The hairy roots and crown galls of Salvia miltiorrhiza were obtained by infecting plant with A. rhizogenes (strain 15834, LBA 9402) and A. tumefaciens (strain C58). The transformed plants were regenerated light and transplanted form cultural medium into soil successfully. The plants transformed by A. rhizogenes have characteristics of short stems and develop hairy roots, those and trans formed by A. tumefaciens grow vigorously featuring, longer stems and well developed roots. Both biomass production and tanshenone content are higher than the original plant.
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238
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Qi J, Toyoshima A, Honda Y, Mineshita S. Pharmacokinetic study on acetaminophen: interaction with a Chinese medicine. JOURNAL OF MEDICAL AND DENTAL SCIENCES 1997; 44:31-5. [PMID: 9385040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To know the influences of a Chinese traditional medicine (KAKKONTO) on the metabolism of acetaminophen (APAP), we have carried out pharmacokinetic studies on APAP under KAKKONTO coadministration in humans and rats. In humans, the pharmacokinetic parameters were calculated from the blood APAP concentration-time curves of each volunteer. The parameters did not show any significant differences between the KAKKONTO-coadministration group (group K) and the APAP-administration group (group A). KAKKONTO, when given at two different doses, did not show any significant effects on blood APAP level. In rats, the blood APAP level was significantly higher than that of group A (p < 0.01) only in the 100 mg/kg of group K at 0.25 h after APAP administration. There were no other significant differences.
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MESH Headings
- Acetaminophen/administration & dosage
- Acetaminophen/blood
- Acetaminophen/metabolism
- Acetaminophen/pharmacokinetics
- Administration, Oral
- Adult
- Analgesics, Non-Narcotic/administration & dosage
- Analgesics, Non-Narcotic/blood
- Analgesics, Non-Narcotic/metabolism
- Analgesics, Non-Narcotic/pharmacokinetics
- Animals
- Antiviral Agents/administration & dosage
- Antiviral Agents/pharmacokinetics
- Antiviral Agents/pharmacology
- Area Under Curve
- Chromatography, High Pressure Liquid
- Cross-Over Studies
- Drug Interactions
- Drugs, Chinese Herbal/administration & dosage
- Drugs, Chinese Herbal/pharmacokinetics
- Drugs, Chinese Herbal/pharmacology
- Female
- Half-Life
- Humans
- Male
- Middle Aged
- Rats
- Rats, Wistar
- Time Factors
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239
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Han J, Yan W, Qian Q, Han M, Qiu L, Shi H, Li C, Li X, Qi J, Feng S. [In vitro reversal of homoharringtonine resistance by the combination of tamoxifen and verapamil]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 1997; 18:143-6. [PMID: 15622776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
OBJECTIVE To investigate the reversal of homoharringtonine (HHT)-resistance by tamoxifen (TAM) or verapamil (VER) alone or in combination. METHODS The drug-sensitivity test was performed with semisolid agar culture. RESULTS The cytotoxicity of HHT to K562/S cells was not enhanced by TAM or VER alone or in combination,but HHT resistance in HHT resistant cells (K562/H20) was reversed by VER and TAM at nontoxic doses (4micromol/L or 8micromol/L). The IC50 of K562/H20 for HHT decreased from 446.8 +/- 0.08microg/L to 45.1 +/- 0.02microg/L in the presence of 4micromol/L of VER, to 22.4 +/- 0.03microg/L in 8micromol/L of VER, to 85.1 +/- 0.03microg/L in 4micromol/L of TAM and to 26.4 +/- 0.02microg/L in 8micromol/L of TAM. In the presence of combinations of 2micromol/L VER and 4micromol/L TAM and of 2micromol/L VER and 8micromol/L TAM, IC50 of K562/H20 decreased to 30.4 +/- 0.02microg/L and 4.3 +/- 0.04microg/L, respectively. CONCLUSION HHT-resistance could be reversed by VER or TAM alone, and the combination of the two drugs showed a synergistic effect.
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Li XM, Qi J, Juorio A, Boulton A. Reciprocal regulation of the content of aromatic L-amino acid decarboxylase and tyrosine hydroxylase mRNA by NGF in PC12 cells. J Neurosci Res 1997. [DOI: 10.1002/(sici)1097-4547(19970215)47:4<449::aid-jnr10>3.0.co;2-u] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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241
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Li XM, Qi J, Juorio AV, Boulton AA. Reciprocal regulation of the content of aromatic L-amino acid decarboxylase and tyrosine hydroxylase mRNA by NGF in PC12 cells. J Neurosci Res 1997; 47:449-54. [PMID: 9057138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Aromatic L-amino acid decarboxylase (AADC) and tyrosine hydroxylase (TH) are involved in the synthesis of dopamine and other monoamine neurotransmitters, and their activities can be regulated by a number of physiological stimuli. An interesting finding has been that (-)-deprenyl and some other irreversible monoamine B oxidase inhibitors increase AADC gene expression and that these compounds can exert neuronal protection/rescue effects. In this study, we have investigated the effects of nerve growth factor (NGF), and of (-)-deprenyl on AADC and TH gene expression in PC12 cells. Cells were treated with different doses of NGF (0.2-50 ng/ml) for up to 3 days. Northern and blot hybridizations were performed to detect AADC and TH mRNA. The results show that NGF can down-regulate AADC gene expression while increasing TH gene expression in a time- and dose-dependent fashion. Treatment with (-)-deprenyl alone increases the gene expression of AADC, and (-)-deprenyl further counteracts the reductions induced by NGF. This study introduces novel results with regard to the regulation of the gene expression of AADC in PC12 cells, which is not paralleled by the other catecholamine biosynthetic enzymes. These findings support the existence of an interaction between NGF and AADC gene expression that may be associated with the process of neuronal degeneration or regeneration.
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242
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Qi J, Kreutzer DL, Piela-Smith TH. Fibrin induction of ICAM-1 expression in human vascular endothelial cells. THE JOURNAL OF IMMUNOLOGY 1997. [DOI: 10.4049/jimmunol.158.4.1880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
In acute and chronic inflammatory processes, fibrin deposition, and leukocyte accumulation are classic histopathologic hallmarks. Previous studies have shown that fibrin and fibrin degradation products can have biologic effects on vascular endothelial cells and can induce the expression of several endothelial cell-derived factors that may be important in regulating inflammation and tissue repair. We now demonstrate that coculture of human vascular endothelial cells (EC) with fibrin results in the up-regulation of intercellular adhesion molecule-1 (ICAM-1), thus providing a first link between fibrin deposition and adhesion molecule expression, which may lead subsequently to leukocyte accumulation and extravasation. Increased ICAM-1 expression was demonstrated by ELISA, flow cytometry, and functional adhesion assays. EC ICAM-1 expression increased in a time and dose response fashion. Cell surface levels of ICAM-1 induced by fibrin were comparable to, or exceeded, levels induced by IL-1beta. ICAM-1 expression increased beginning at 4 h post-fibrin formation with sustained elevated expression at 48 h. Fibrin-stimulated EC also bound increased numbers of polymorphonuclear neutrophils in cellular adhesion assays. This increase in adhesion could be blocked by Ab to ICAM-1. Inhibition of fibrin polymerization also inhibited the up-regulation of ICAM-1. Culture medium from fibrin-stimulated EC contained elevated levels of soluble ICAM-1. These data suggest that fibrin deposition on vascular EC, in addition to other reported effects on EC metabolism, may also lead to leukocyte accumulation and extravasation through the induction of leukocyte adhesion molecules such as ICAM-1.
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Qi J, Kreutzer DL, Piela-Smith TH. Fibrin induction of ICAM-1 expression in human vascular endothelial cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1997; 158:1880-6. [PMID: 9029129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In acute and chronic inflammatory processes, fibrin deposition, and leukocyte accumulation are classic histopathologic hallmarks. Previous studies have shown that fibrin and fibrin degradation products can have biologic effects on vascular endothelial cells and can induce the expression of several endothelial cell-derived factors that may be important in regulating inflammation and tissue repair. We now demonstrate that coculture of human vascular endothelial cells (EC) with fibrin results in the up-regulation of intercellular adhesion molecule-1 (ICAM-1), thus providing a first link between fibrin deposition and adhesion molecule expression, which may lead subsequently to leukocyte accumulation and extravasation. Increased ICAM-1 expression was demonstrated by ELISA, flow cytometry, and functional adhesion assays. EC ICAM-1 expression increased in a time and dose response fashion. Cell surface levels of ICAM-1 induced by fibrin were comparable to, or exceeded, levels induced by IL-1beta. ICAM-1 expression increased beginning at 4 h post-fibrin formation with sustained elevated expression at 48 h. Fibrin-stimulated EC also bound increased numbers of polymorphonuclear neutrophils in cellular adhesion assays. This increase in adhesion could be blocked by Ab to ICAM-1. Inhibition of fibrin polymerization also inhibited the up-regulation of ICAM-1. Culture medium from fibrin-stimulated EC contained elevated levels of soluble ICAM-1. These data suggest that fibrin deposition on vascular EC, in addition to other reported effects on EC metabolism, may also lead to leukocyte accumulation and extravasation through the induction of leukocyte adhesion molecules such as ICAM-1.
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Zhou Z, Leahy RN, Qi J. Approximate maximum likelihood hyperparameter estimation for Gibbs priors. IEEE TRANSACTIONS ON IMAGE PROCESSING : A PUBLICATION OF THE IEEE SIGNAL PROCESSING SOCIETY 1997; 6:844-861. [PMID: 18282978 DOI: 10.1109/83.585235] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The parameters of the prior, the hyperparameters, play an important role in Bayesian image estimation. Of particular importance for the case of Gibbs priors is the global hyperparameter, beta, which multiplies the Hamiltonian. Here we consider maximum likelihood (ML) estimation of beta from incomplete data, i.e., problems in which the image, which is drawn from a Gibbs prior, is observed indirectly through some degradation or blurring process. Important applications include image restoration and image reconstruction from projections. Exact ML estimation of beta from incomplete data is intractable for most image processing. Here we present an approximate ML estimator that is computed simultaneously with a maximum a posteriori (MAP) image estimate. The algorithm is based on a mean field approximation technique through which multidimensional Gibbs distributions are approximated by a separable function equal to a product of one-dimensional (1-D) densities. We show how this approach can be used to simplify the ML estimation problem. We also show how the Gibbs-Bogoliubov-Feynman (GBF) bound can be used to optimize the approximation for a restricted class of problems. We present the results of a Monte Carlo study that examines the bias and variance of this estimator when applied to image restoration.
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Wang H, Yi S, Xiao Y, Li D, Qi J, Fu J. [Establishment of human amnion cell mutagenesis system by using a shuttle vector pS189]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1996; 27:372-7. [PMID: 9389006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Using transient shuttle vector pS189, we established a subclone human amnion cell (FL) mutagenesis detection system, and we detected the mutation specificity of N-methy-N'-nitro-N-nitrosoguanidine (MNNG) in this system. The spontaneous mutant frequency of target gene supF was 1.7 x 10(-5) and MNNG-induced mutant frequency was increased with dosage. The results from 0.8% agarose gel electrophoresis, PCR, PCR-single strand conformation polymorphism (PCR-SSCP) analysis showed that MNNG-induced 89% mutants were point mutants. These results indicated that this system can be used to detect and study the mutagenesis mechanism of potential mutagens.
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Seeman NC, Qi J, Li X, Yang X, Liu B, Qiu H. The design of lattices from DNA branched junctions: principles and problems. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396078981] [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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247
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Jian M, Cao X, Huang J, Qi J, Liu G, Wang J, Bai D, Qiao D, Zhao JF, Feng S, Liu L. Polymorphism of angiotensin I converting enzyme gene in the older Chinese: linked to ambulatory blood pressure levels and circadian blood pressure rhythm. Int J Cardiol 1996; 55:33-40. [PMID: 8839808 DOI: 10.1016/0167-5273(96)02629-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
This study was undertaken to evaluate the association of polymorphism of angiotensin I converting enzyme (ACE) gene with causal and ambulatory blood pressure in the Chinese population. Genomic DNA was amplified by polymerase chain reaction (PCR) using primers flanking the polymorphic region in intron 16 of the ACE gene. Alleles were detected on agarose gels stained with ethidium bromide. Causal blood pressure was measured in the 133 normotensive and 122 essential hypertensive subjects; of the essential hypertensive subjects, 65 patients underwent non-invasive ambulatory blood pressure. There was no significant difference of ACE genotype and allele frequencies between the hypertensive and normotensive subjects. Non-significant differences were demonstrated in gender, age, causal blood pressure according to the ACE gene genotypes in the 65 patients who underwent non-invasive ambulatory blood pressure; however, effects of the ACE gene genotypes were observed on the derivatives of ambulatory blood pressure, including sleeping blood pressure levels and circadian blood pressure rhythm (p < 0.05). We suggest that insertion/deletion polymorphism of the ACE gene should be associated with blood pressure and ambulatory blood pressure might be superior to causal blood pressure at the molecular level.
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Min ZL, Zhao M, Zhu YH, Qi J, Wang LM, Wang YW. Experience with clinical use of Sandimmun Neoral in renal transplant patients. Transplant Proc 1996; 28:1356-7. [PMID: 8658692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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249
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Fang R, Qi J, Lu ZB, Zhou H, Li W, Shen J. Selection of trypsin inhibitors in phage peptide library. Biochem Biophys Res Commun 1996; 220:53-6. [PMID: 8602856 DOI: 10.1006/bbrc.1996.0355] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The newly developed techniques of peptide libraries have become a conventional and efficient method in screening ligands of proteins of interest. We present here the successful results of selection of trypsin inhibitors in a phage hexapeptide library. After affinity selection and activity assay, peptide sequences, deduced from DNA sequencing of the phage peptides with the most striking trypsin activity, share some common features with trypsin inhibitors reported. All of the phage peptides selected out and those native and synthetic trypsin inhibitors reported are composed of three parts: (a) positively charged part (Arg, Lys or their analogs); (b) polar part that may form hydrogen bonds with Ser in the active site of trypsin; (c) hydrophobic part that interacts with the nonpolar region of trypsin active site.
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Qi J, Angerer W, Yeganeh MS, Yodh AG, Theis WM. Observation of midgap interface states in buried metal/GaAs junctions. PHYSICAL REVIEW LETTERS 1995; 75:3174-3177. [PMID: 10059513 DOI: 10.1103/physrevlett.75.3174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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