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Cai J, Qi Y, Wu R, Modderman G, Fu H, Liu R, Qiu M. Mice lacking the Nkx6.2 (Gtx) homeodomain transcription factor develop and reproduce normally. Mol Cell Biol 2001; 21:4399-403. [PMID: 11390667 PMCID: PMC87099 DOI: 10.1128/mcb.21.13.4399-4403.2001] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The Nkx homeobox genes are expressed in a variety of developing tissues and have been implicated in controlling tissue patterning and cell differentiation. Expression of Nkx6.2 (Gtx) was previously observed in the embryonic neural tube, testis, and differentiating oligodendrocytes. To investigate the role of Nkx6.2 in the control of cell specification and differentiation, we generated mice with null mutations in Nkx6.2 using the standard gene targeting approach. Null mutant mice were viable and fertile without apparent histological and immunohistochemical changes in the central nervous systems and testis. The absence of detectable phenotypes suggests a redundant function of Nkx6.2 in mouse development.
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452
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Hou M, Li H, Qiu M, Li L, Yan X. [A clinical study on the combination of gemcitabine and cisplatin in the treatment of advanced non-small cell lung cancer]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 2001; 4:191-3. [PMID: 21047475 DOI: 10.3779/j.issn.1009-3419.2001.03.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND To evaluate the efficacy and toxicity of the combination of gemcitabine and cisplatin in the treatment of patients with advanced non-small cell lung cancer (NSCLC). METHODS Forty-three patients with locally advanced (stage IIIB) or metastatic (stage IV) NSCLC were enrolled into the study. The patients received gemcitabine 1 000 mg/m² on day 1,8 and 15, and cisplatin 30 mg/m² on day 1-3 of the 28-day cycle; or gemcitabine 1 200 mg/m² on day 1 and 8, cisplatin 30 mg/m² on day 1-3, administered in 21-day cycle. RESULTS An objective response was obtained in 48.8% of patients (one complete and 20 partial responses), whereas 13 patients had stable disease and 9 patients were progressive. The response rate was 62.5% in patients with no prior chemotherapy, and the response rate of 31.6% was achieved in patients who had been given prior treatment. Significant difference existed between the two groups (P<0.05). The main toxicities were leukopenia and thrombocytopenia. CONCLUSIONS The combination of gemcitabine and cisplatin is a feasible, well-tolerated, and active scheme in the treatment of advanced NSCLC.
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453
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Li B, He T, Li J, Qiu M. [The effects of quercetin and isorhamnetin on oxidative modification of VLDL induced by Cu2+]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 2001; 32:281-2, 285. [PMID: 12600108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
OBJECTIVE To observe the effects of quercetin(Que) and isorhamnetin (Iso) on the oxidative modification of very low density lipoprotein (VLDL). METHODS Human VLDL was prepared by one-step ultracentrifuge and oxidized by Cu2+ in vitro; Que and Iso in different concentrations were added to VLDL before incubation with Cu2+. The MDA, vitamin E contents and the activity of superoxide dismutase(SOD) in ox-VLDL were determined. RESULTS Compared with ox-VLDL group, Que and Iso decreased MDA production in a dependent concentration-manner, Que and Iso also elevated Vit E level and SOD activity markedly. CONCLUSION This experiment indicates that Que and Iso have similar inhibitory effects on the oxidative modification of VLDL.
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454
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Ma W, Xia C, Ling P, Qiu M, Luo Y, Tan TH, Liu M. Leukocyte-specific adaptor protein Grap2 interacts with hematopoietic progenitor kinase 1 (HPK1) to activate JNK signaling pathway in T lymphocytes. Oncogene 2001; 20:1703-14. [PMID: 11313918 DOI: 10.1038/sj.onc.1204224] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2000] [Revised: 12/21/2000] [Accepted: 01/04/2001] [Indexed: 11/09/2022]
Abstract
Immune cell-specific adaptor proteins create various combinations of multiprotein complexes and integrate signals from cell surface receptors to the nucleus, modulating the specificity and selectivity of intracellular signal transduction. Grap2 is a newly identified adaptor protein specifically expressed in lymphoid tissues. This protein shares 40--50% sequence homology in the SH3 and the SH2 domain with Grb2 and Grap. However, the Grap2 protein has a unique 120-amino acid glutamine- and proline-rich domain between the SH2 and C-terminal SH3 domains. The expression of Grap2 is highly restricted to lymphoid organs and T lymphocytes. In order to understand the role of this specific adaptor protein in immune cell signaling and activation, we searched for the Grap2 interacting protein in T lymphocytes. We found that Grap2 interacted with the hematopoietic progenitor kinase 1 (HPK1) in vitro and in Jurkat T cells. The interaction was mediated by the carboxyl-terminal SH3 domain of Grap2 with the second proline-rich motif of HPK1. Coexpression of Grap2 with HPK1 not only increased the kinase activity of HPK1 in the cell, but also had an additive effect on HPK1 mediated JNK activation. Furthermore, over expression of Grap2 and HPK1 induced significant transcriptional activation of c-Jun in the JNK signaling pathway and IL-2 gene reporter activity in stimulated Jurkat T cells. Therefore, our data suggest that the hematopoietic specific proteins Grap2 and HPK1 form a signaling complex to mediate the c-Jun NH(2)-terminal kinase (JNK) signaling pathway in T cells.
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455
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Liu R, Li B, Qiu M. Elevated superoxide production by active H-ras enhances human lung WI-38VA-13 cell proliferation, migration and resistance to TNF-alpha. Oncogene 2001; 20:1486-96. [PMID: 11313892 DOI: 10.1038/sj.onc.1204214] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2000] [Revised: 12/28/2000] [Accepted: 01/03/2001] [Indexed: 11/08/2022]
Abstract
Accumulating evidence has suggested that cellular production of superoxide acts as an intracellular messenger to regulate gene expression and modulate cellular activities. In this report, we set out to investigate the role of active H-ras-mediated superoxide production on tumor cell malignancy in a SV-40 transformed human lung WI-38 VA-13 cell line. Stable transfection and expression of constitutively active mutant V12-H-ras (V12-H-ras) dramatically increased intracellular production of superoxide. The expression of V12-H-ras significantly enhanced cell proliferation, migration and resistance to TNF-alpha treatment compared to that of parental and vector control cells, while expression of wild type H-ras (WT-H-ras) only had modest effects. Upon scavenging by superoxide dismutase and other molecules that decrease the intracellular level of active H-ras mediated superoxide production, cell proliferation, migration and resistance to TNF-alpha were significantly reduced. Furthermore, we demonstrated that the activation of membrane NADPH oxidase activity by expression of active H-ras contributed to the intracellular superoxide production. The causal relationship between membrane superoxide production and increased cell proliferation, migration, and resistance to TNF-alpha by the expression of active H-ras, has provided direct evidence to demonstrate that superoxide acts as an intracellular messenger to cascade ras oncogenic signal relay and to modulate tumor malignant activity.
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456
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Qiu M, Liu X. Determination of sphinganine, sphingosine and Sa/So ratio in urine of humans exposed to dietary fumonisin B1. FOOD ADDITIVES AND CONTAMINANTS 2001; 18:263-9. [PMID: 11304035 DOI: 10.1080/02652030117470] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Fumonisin B1 (FB1) is an inhibitor of sphinganine N-acyltransferase and the increase in the sphinganine/ sphingosine (Sa/So) ratio in urine or serum has been proposed as a biomarker to evaluate exposure to fumonisins. The objectives of this study were to (1) develop a liquid chromatographic method sufficiently sensitive to determine the low concentration of free Sa in male human urine, and (2) analyse So and Sa in human urine and monitor the Sa/So ratio in urine of humans exposed to FB1 in corn diets over 1 month. The liquid chromatographic method involved isolation from human urine of exfoliated cells followed by an extraction of free sphingoid bases and their separation and quantification by high performance liquid chromatography. The detection limits for So and Sa were 0.15 ng/ml in female urine (2 ml used) and 0.005 ng/ ml in male urine (60 ml used). Twenty-eight healthy adult volunteers consumed for 1 month a normal diet containing their homegrown corn potentially contaminated with FB1. Immediately preceding the start of the test, morning urine samples for the determination of So and Sa were collected from each person, and the corn samples used in cooking were obtained from each family for the determination of FB1. At the end of the test period, morning-urine samples were collected from each person and analysed again. The daily FB1 intakes were estimated and used to assess the relationship between them and the urinary Sa/So ratios in humans exposed to dietary FB1 over 1 month. All the homegrown corn samples contained FB1 ranging from 0.08 to 41.1 mg/kg, and the estimated daily FB1 intakes ranged from 0.4 to 740 microg/kg b.w./day. The 1-month monitoring results suggest that sphingolipid metabolism of humans could be affected by FB1 intake, the urinary Sa/So ratio may be useful for evaluating FB1 exposure when the contamination of FB1 is high, and that males are more sensitive to FB1 disruption of sphingolipid metabolism than females.
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457
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Yao X, Qiu M, Lü W, Chen H, Zheng Z. Substituted salen–Ru(II) complexes as catalysts in the asymmetric cyclopropanation of styrene by ethyl diazoacetate: the influence of substituents and achiral additives on activity and enantioselectivity. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0957-4166(01)00014-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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458
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Xu X, Cai J, Fu H, Wu R, Qi Y, Modderman G, Liu R, Qiu M. Selective expression of Nkx-2.2 transcription factor in chicken oligodendrocyte progenitors and implications for the embryonic origin of oligodendrocytes. Mol Cell Neurosci 2000; 16:740-53. [PMID: 11124894 DOI: 10.1006/mcne.2000.0916] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Recent studies have demonstrated that oligodendrocytes originate from the ventral region of the developing spinal cord. However, the precise neuroepithelial origin of oligodendrocytes remains controversial, and the transcriptional control of oligodendrocyte lineage specification is largely unknown. Here we present evidence that oligodendrocytes in the embryonic chicken spinal cord can be generated from neuroepithelial cells that express the Nkx-2.2 homeodomain transcription factor. Nkx-2.2 expression is initially confined to a narrow stripe of neuroepithelium flanking the floor plate. Later, Nkx-2.2+ cells migrate ventrally and dorsolaterally into the surrounding gray and white matter regions where they undergo rapid proliferation. Double labeling experiments revealed that Nkx-2.2+ cells coexpress markers specific for oligodendrocyte progenitors, e.g., PDGFRalpha+, O4, and R-mAb antigens. In the brain, the Nkx-2.2 cells are also highly migratory and can generate oligodendrocytes. The persistent expression of the Nkx-2.2 homeodomain transcription factor in the oligodendrocyte lineage suggests its important role in the control of oligodendrocyte development.
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459
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Ke Z, Zheng C, Qiu M, Shen Y, Hua J. [Laparoscopic gastric resection]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 2000; 38:680-2. [PMID: 11832138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To modify laparoscopic surgery for gastric diseases. METHODS From December 1992 to January 1999, 61 gastric laparoscopic operations were performed in our hospital. The age of the patients ranged from 29 to 78 years (mean 57.4). 17 patients had Billroth II gastrectomy, 1 Billroth I gastrectomy, 2 proximal subtotal gastrectomy, 5 highly selective vagotomy, 3 gastrostomy, and 33 resection of gastric submucosal benign tumor. 54 patients (88.5%) underwent complete laparoscopy, and 7 (11.5%) an assisted one RESULTS The mean operative time was (164.2 +/- 93.5) min, the mean estimated blood loss was (218.3 +/- 166.6) ml, and the mean hospital stay was (6.8 +/- 2.1) days. Flatus was present within 48 hours in 86% of the patients. Two patients had laparoscopic surgery for early gastric cancer, and were followed up for more than 55 months. Postoperative complication were noted in 2 patients, who were cured by reoperation and endoscopy therapy respectively. Only 4 patients required postoperative analgesics. CONCLUSION Although specific indications need to be defined, laparoscopic surgery is feasible. But long-term follow-up should be made to evaluate its efficacy in treatment of gastric cancer.
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460
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Xia C, Bao Z, Tabassam F, Ma W, Qiu M, Hua S, Liu M. GCIP, a novel human grap2 and cyclin D interacting protein, regulates E2F-mediated transcriptional activity. J Biol Chem 2000; 275:20942-8. [PMID: 10801854 DOI: 10.1074/jbc.m002598200] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Regulation of mammalian cell growth and proliferation is governed through receptor-mediated signaling networks that ultimately converge on the cell cycle machinery. Adaptor proteins play essential roles in the formation of intracellular signaling complexes, relaying extracellular signals from the plasma membrane to the nucleus of a cell. The leukocyte-specific adaptor protein Grap2 is a central linker protein in immune cell signaling and activation. Using Grap2 as bait protein, we identified a novel human protein, GCIP (Grap2 cyclin-D interacting protein). We found that GCIP bound to Grap2 in both yeast two-hybrid assays and in mammalian cells through binding to the COOH-terminal unique domain and SH3 domain (designated QC domain) of Grap2. GCIP also associated with cyclin D both in vitro and in vivo. The expression of GCIP was found in all human tissues examined with the highest level of expression in the heart, muscle, peripheral blood leukocytes, and brain. Furthermore, phosphorylation of retinoblastoma protein by cyclin D-dependent protein kinase was reduced and E2F1-mediated transcription activity was inhibited in cells transfected with GCIP. High level expression of GCIP in terminally differentiated tissues and the inhibition of E2F1 transcription activation suggest that GCIP could play an important role in controlling cell differentiation and proliferation.
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461
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Li L, Zhou Q, Li H, Liu L, Qiu M, Luo D, Yi C, Zhang S, Cheng N. [A study on the relationship between the expression of Bax gene products and prognosis in patients with human non-small cell lung cancer]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 2000; 3:180-2. [PMID: 20950545 DOI: 10.3779/j.issn.1009-3419.2000.03.05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND To explore the relationship between the expression of Bax gene and oncogenesis , development and prognosis of lung cancer. METHODS The expression level of Bax gene products was detected in 124 human non-small cell lung cancer by immunohistochemistry labelled-streptavidin-biotin methods. RESULTS The expressional level of Bax products in lung cancer tissues (53. 76 %) was significantly lower than that in the normal tissues adjacent to lung cancer (75. 51 %) and normal lung tissues (74. 97 %) ( P < 0. 01) . The expressional level of Bax products was closely related with P-TNM stage , the size of primary tumor and lymph node metastasis ( P < 0. 01 or P < 0. 05) ; but not to histological classification , cell differentiation and site of the cancer , and age , sex of the patients and smoking or not ( P > 0. 05) . The five-year survival rate in patients with high Bax expression was significantly higher than that in patients with low Bax expression ( P < 0. 01) . CONCLUSIONS Abnormal expression of Bax gene may play an important role in the oncogenesis , development and prognosis of lung cancer. Bax gene may be involved in the oncogenesis , development and metastasis of lung cancer.
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462
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Zhou Q, Qiu M, Hou M, Ren L, Li L, Yi C, Yang Y, Liu L, Li Z, Xu Y, Luo D, Wang Q, Zhang L, Lin J, Shi J. [A multicenter randomized phase II trial of domestic product of rhG-CSF(Rui Xue Xin) in preventing leukopenia caused by chemotherapy in patients with lung cancer]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 2000; 3:161-5. [PMID: 20950541 DOI: 10.3779/j.issn.1009-3419.2000.03.01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND To evaluate the effect and toxicity of the domestic product of rhG-CSF (Rui Xue Xin) in preventing leukopenia caused by chemotherapy in patients with lung cancer. METHODS 67 patients in multicenter were randomly devided into AB group and BA group. The first cycle was a trial cycle (chemotherapy plus injection of Rui Xue Xin) , and the second cycle was a control cycle (chemotherapy alone) in AB group. On the contrast , the first cycle was a control cycle , and the second cycle was a trial cycle in BA group. The changes of white blood cell (WBC) and absolute neutrophil counts (ANC) , and the side effect of Rui Xue Xin were observed and compared between the trial cycle and control cycle. RESULTS Of the 67 patients , 6 cases were out of the trial because of patient compliance , and the another one case due to fever , and the other 61 cases could be used to analyze and to evaluate the effects and toxicity of Rui Xue Xin. The duration of leukopenia and neutropenia in cycle A was significantly shorter than that in cycle B ( P < 0. 01) . The nadirs of WBC and ANC following chemotherapy were remarkably higher in cycle A than those in cycle B ( P < 0. 01) . The incidence of chemotherapy delay due to WBC < 4. 0 *109 /L on the 21st day after chemotherapy in cycle A was also significantly lower than that in cycle B ( P < 0. 01) . The total rate of side effects of Rui Xue Xin was 26. 2 % , including pain and scleroma on the injection sites , weakness , fever. But , all of them were mild and didn't need to give any treatment. CONCLUSIONS The results demonstrate that Rui Xue Xin is able to reduce the degree of leukopenia and neutropenia , and to shorten the duration of leukopenia and neutropenia caused by chemotherapy in patients with lung cancer. The toxicity is also slight.
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463
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Cai J, Xu X, Yin H, Wu R, Modderman G, Chen Y, Jensen J, Hui CC, Qiu M. Evidence for the differential regulation of Nkx-6.1 expression in the ventral spinal cord and foregut by Shh-dependent and -independent mechanisms. Genesis 2000; 27:6-11. [PMID: 10862150 DOI: 10.1002/1526-968x(200005)27:1<6::aid-gene20>3.0.co;2-o] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The Nkx-6.1 homeodomain transcription factor was previously shown to be expressed in ventral neural progenitor cells and subsequently subsets of unidentified motor neurons during early neural development. In this study, we identify a specific subpopulation of motor neurons, the median half of the lateral motor neuron column (LMCm), that retain a strong expression of Nkx-6.1. In addition, we report novel patterns of Nkx-6.1 expression in several mesenchymal tissues surrounding Sonic hedgehog (Shh)-expressing cells, including ventral spinal meninges, esophageal mesenchyme, and dorsal tracheal mesenchyme. Whereas Shh signaling is required for Nkx-6.1 expression in the ventral neural tube and spinal meninges, an Shh-independent pathway appears to operate in regulating Nkx-6.1 expression in the foregut. The persistent and robust expression of Nkx-6.1 in motor neurons and mesenchymal cells suggests an important role for Nkx-6.1 in controlling cell fate specification and differentiation. genesis 27:6-11, 2000.
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Yu XJ, Chang SY, Wu JM, Qiu M, Song D, Yang TD. Thermal physiological consideration of precooling procedures in manned space craft. HANG TIAN YI XUE YU YI XUE GONG CHENG = SPACE MEDICINE & MEDICAL ENGINEERING 2000; 13:90-4. [PMID: 11543058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
OBJECTIVE To explore a space craft precooling temperature at which excessive thermal stress on the crew member could be prevented or reduced in an overheated launch or reentry module. METHOD Five young male volunteers wearing a space suit participated in 25 tests at sea level. The space suit was either ventilated in a volume air flow rate of 100 L/min (STPD) with ambient air at temperatures (Ta) of 15 degrees C, 10 degrees C, and 5 degrees C, respectively, or not ventilated. Rectal (Tr), mean skin (Tsk) and mean body (Tb) temperatures were measured. RESULT At Ta 15 degrees C, Tr decreased without significance (from 37.0 +/- 0.2C to 36.7 +/- 0.3 degrees C) in 120-min tests, whereas mean Tsk and mean Tb decreased significantly, and subjects had local cold strain whether the space suit was ventilated or not; while at Ta 10 degrees C, Tr decreased from 37.0 +/- 0.3 degrees C to 36.3 +/- 0.3 degrees C (P < 0.05), subjects had a whole body cold strain, and both mean Tsk and Tb dropped continuously and significantly. CONCLUSION Ambient temperature 15 degrees C, at which the thermal comfort states of crew was not significantly degraded, was acceptable after precooling in a space craft.
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465
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Sun L, Qiu M, Weng L, Zheng H, Liu J. Effects of XW630 on bone formation in ovariectomized rats and in human osteoblast-like cells. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 2000; 15:8-13. [PMID: 12899391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
OBJECTIVE To study the effects of XW630 on bone formation in overiectomized (OVX) rats and in human osteoblast-like cell line TE85. METHOD Bone histomorphometric analysis was performed with undecalcified bone sections and tetracycline intraperitoneally labeling. RESULTS Compared with that of OVX rats, the static data of trabecular bone volume (TBV)/total tissue volume (TTV), TBV/sponge bone volume (SBV) and mean trabecular plate density (MTPD) were enhanced while mean trabecular plate spacing (MTPS) decreased after treated with XW630 for 13w. The dynamic data of single-labeled surface [Sfract(s)], double-labeled surface [Sfract(d)], Sfract(d+1/2s), trabecular osteoid surface (TOS) and bone formation rate in tissue level (Svf) were increased and osteoid maturation period (OMP) shortened in XW630 group. In osteoblast-like cells, both 3H-thymidine incorporation and cell count increased after treated with XW630 for 48. Treated with XW630 for 12 approximately 18h, inducible nitric oxide synthase (iNOS) activity and cGMP content increased in time-dependent manners. CONCLUSIONS XW630 enhanced bone activation frequency and increased trabecular connectivity, stability, and strength. The cellular mechanism related to effects of XW630 on bone formation in ovariectomized rats.
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466
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Zhou D, Qiu M, Guan Y, Li L. Changes of nitric oxide and its relationship with clinical features, intracranial pressure and outcome in acute head injury. Curr Med Sci 2000; 20:148-50. [PMID: 12845733 DOI: 10.1007/bf02887058] [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] [Received: 12/14/1999] [Indexed: 10/19/2022]
Abstract
To investigate the content and dynamics of nitric oxide (NO) in the cerebrospinal fluid (CSF) of patients with acute head injury and to clarify the relationship of NO with clinical features and intracranial pressure (ICP) as well as outcomes, 38 adults with acute head injury were studied. Glasgow Coma Scale (GCS) obtained at admission and Glasgow Outcome Scale (GOS) 3 months after injury was assessed. ICP was surveyed via intraventricular catheter and lumbar puncture and CSF samples were obtained simultaneously. NO was determined with Griess reagents. Results showed that NO peak content in the head injury group was significantly higher than that of the control group. During dynamic research, no peak content of mildly injured cases and severely injured ones appeared in different time windows respectively. The peak value of NO was distinctly higher in the severe group than in the mild group. NO peak value of the raised ICP group was remarkably higher than that of the normal ICP group. The peak value of NO was considerately higher in the poor outcome group than in the good outcome group. When the content of NO was over 6.5 mumol/L, the rate of poor outcome was increased. There existed a correlation between NO and GCS, ICP and GOS. It is concluded that the content of NO was increased in patients with acute head injury and the changes of NO had different time windows in severely injured patients and mildly injured ones. The more sever the injury, the higher the NO content; and the more serious the secondary brain injury and brain edema, the worse the outcomes. When NO is combined with GCS, GOS and ICP, it increases the accuracy of judgement to the degree of head injury and outcome.
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Ren L, Hou M, Yi C, Luo D, Qiu M, Xie M, Mei Z. [Comparison between carboplatin and cisplatin plus etoposide and carboplatin plus etoposide in the treatment of small cell lung cancer.]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 1999; 2:87-9. [PMID: 20929637 DOI: 10.3779/j.issn.1009-3419.1999.02.08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND To evaluate the effect and toxicity of combination chemotherapy with carboplatin and cisplatin plus etoposide (CPE regimen) and carboplatin plus etoposide (CE regimen) in the treatment of small cell lung cancer (SCLC) . METHODS Thirty-two patients with SCLC were treated with CPE and CE regimens , and each regimen had 16 cases respectively. There were 10 retreated cases in CPE group and 7 retreated cases in CE group. RESULTS The total response rate (CR + PR) was 81. 3 %(13/ 16) in CPE group , and 87. 5 %(14/ 16) in CE group ( P > 0. 05) respectively. The response rate of the retreated cases in CPE group was 60 %(6/ 10) , and 42. 9 %(3/ 7) in CE group ( P < 0. 05) . The bone marrow suppression rate was 71. 9 % in CPE group and 93. 8 % in CE group ( P < 0. 05) . There were no significant differences between other toxicity in both groups ( P > 0. 05) . CONCLUSIONS The therapeutic effect of CPE regimen in SCLC is similar to that of CE regimen , but the bone marrow suppression rate of CPE regimen is less severe than that of CE regimen. The therapeutic effect of CPE regimen is better than that of CE regimen for the retreated cases.
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468
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Cai J, St Amand T, Yin H, Guo H, Li G, Zhang Y, Chen Y, Qiu M. Expression and regulation of the chickenNkx-6.2 homeobox gene suggest its possible involvement in the ventral neural patterning and cell fate specification. Dev Dyn 1999; 216:459-68. [PMID: 15672537 DOI: 10.1002/(sici)1097-0177(199912)216:4/5<459::aid-dvdy14>3.0.co;2-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Rapid accumulating evidence has suggested that the homeodomain transcription factors of the Nkx family play important roles in controlling vertebrate organ patterning and differentiation. In this study, we report the cloning, expression and regulation of a novel chicken homeobox gene, cNkx-6.2, whose expression is similar, but not identical, to that of mouse Nkx-6.2. The earliest expression of cNkx-6.2 was detected at the neural plate stage in the prospective midbrain and hindbrain regions. As the neural development proceeds, cNkx-6.2 expression was restricted in the ventral region of the entire neural axis except the forebrain region. At late stages of development, cNkx-6.2 expression is downregulated in the ventricular neuroepithelial cells, but subsequently upregulated in a sub-population of cells. Tissue recombination and explant culture experiments demonstrated that expression of cNkx-6.2 can be induced by the notochord signal and purified SHH protein, and repressed by BMP-4 and -7, indicating that the cNkx-6.2 expression can be influenced by both ventral and dorsal midline signals. Taken together, these studies have suggested two different roles for the cNkx-6.2 transcription factor: participating in the Shh-initiated ventral patterning during early CNS development and controlling cell fate specification and differentiation during late development.
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469
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Yu XJ, Chang SY, Wu JM, Qiu M, Wen JF, Yang TD. [Thermal physiological analysis of man in an Intravehicular Activity space suit]. HANG TIAN YI XUE YU YI XUE GONG CHENG = SPACE MEDICINE & MEDICAL ENGINEERING 1999; 12:356-9. [PMID: 12022181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
OBJECTIVE To analyze the thermal physiological changes of man in a Intravehicular Activity (IVA) space suit. METHOD Combined second design was used to arrange 24 tests in 6 young male subjects wearing an IVA space suit at sea level. RESULT The relationship between common thermal physiological measurements and air ventilating parameters (air temperature, flow rate and its relative humidity) together with metabolic state (rest or work) of man were established in mathematical models. Possible applications of these models were illustrated. Metabolic heat production which influences the relations was also discussed. CONCLUSION Thermal physiological changes of man in the space suit were properly expressed by the mathematical models in this paper.
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470
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Qiu M, Jiang M, Zhao YJ, Cao PL. Reconstruction of small Si cluster after ethylene adsorption: A full-potential linear-muffin-tin-orbital molecular-dynamics study. J Chem Phys 1999. [DOI: 10.1063/1.479016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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471
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Chen M, He T, Qiu M. [Application of enzyme-linked immunosorbent assay for cholecystokinin]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1999; 30:217-9. [PMID: 12212065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
An enzyme-linked immunosorbent assay for octapeptide cholecystokinin (CCK) has been developed. Using this method we distinguished two kinds of CCK-related peptides and is also useful for identified the compounds with CCK-like structure in tissue extracts, as well as different antipeptide antisera. The results showed that this method could be applied to preliminary structure analysis of CCK.
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472
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Zhang Y, Zhao X, Hu Y, St Amand T, Zhang M, Ramamurthy R, Qiu M, Chen Y. Msx1 is required for the induction of Patched by Sonic hedgehog in the mammalian tooth germ. Dev Dyn 1999; 215:45-53. [PMID: 10340755 DOI: 10.1002/(sici)1097-0177(199905)215:1<45::aid-dvdy5>3.0.co;2-5] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have used the mouse developing tooth germ as a model system to explore the transmission of Sonic hedgehog (Shh) signal in the induction of Patched (Ptc). In the early developing molar tooth germ, Shh is expressed in the dental epithelium, and the transcripts of Shh downstream target genes Ptc and Gli1 are expressed in dental epithelium as well as adjacent mesenchymal tissue. The homeobox gene Msx1 is also expressed in the dental mesenchyme of the molar tooth germ at this time. We show here that the expression of Ptc, but not Gli1, was downregulated in the dental mesenchyme of Msx1 mutants. In wild-type E11.0 molar tooth mesenchyme SHH-soaked beads induced the expression of Ptc and Gli1. However, in Msx1 mutant dental mesenchyme SHH-soaked beads were able to induce Gli1 but failed to induce Ptc expression, indicating a requirement for Msx1 in the induction of Ptc by SHH. Moreover, we show that another signaling molecule, BMP4, was able to induce Ptc expression in wild-type dental mesenchyme, but induced a distinct expression pattern of Ptc in the Msx1 mutant molar mesenchyme. We conclude that in the context of the tooth germ Msx1 is a component of the Shh signaling pathway that leads to Ptc induction. Our results also suggest that the precise pattern of Ptc expression in the prospective tooth-forming region is controlled and coordinated by at least two inductive signaling pathways.
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473
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Dai C, Qiu M. [Advances in the study of mechanism of estrogen in the regulation of bone metabolism]. ZHONGHUA FU CHAN KE ZA ZHI 1999; 34:124-5. [PMID: 11263198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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474
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Ma Z, Wang R, Qiu M. [Study of morphologic effects of 4 Chinese herbs by bone histomorphometry in ovariectomized rats]. ZHONGHUA FU CHAN KE ZA ZHI 1999; 34:82-5. [PMID: 11263203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVE To study the therapeutic effects of Chinese herbs Drynaria, Cynomorium, Epimedium and Chain Fern on osteoporotic ovariectomized (OVX) rat models. METHODS 54 Wistar female rats at the age of 3 months were randomly divided into 2 groups: control groups and experimental group. The control group included: normal groups (N), shamed oprations group(S) and ovariectomized group (OVX) (10 in each group); The experimental group: group A (Drynaria), group B (Cynomorium), group C (Epimedium) and group D (Chain Fern) (6 in each group). Each of the experimental groups was fed separately with the 4 Chinese herbs (0.25 g/100 g B.W/day) respectively by mouth every day for 2 months. Double tetracycline labels were carried out on these animals before the sacrifice. Their left tibia was reserved for the preparation of bone specimen and was studied by bone histomorphometry. RESULTS The percentage of trabecular volume in total bone volume (TV/TBV) decreased significantly in OVX rats as compared with shame group (P < 0.01). However, after treatment with Drynaria or Epimedium, TV/TBV increased significantly as compared with that before treatment (P < 0.05). The surface area of tetracycline label in Drynaria group lowered and osteoid percentage increased in Epimedium group. CONCLUSIONS The 4 Chinese herbs have some therapeutic effects on osteoporotic rat models. Drynaria and Epimedium appeared to work better.
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475
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Qiu M, Hua S, Agrawal M, Li G, Cai J, Chan E, Zhou H, Luo Y, Liu M. Molecular cloning and expression of human grap-2, a novel leukocyte-specific SH2- and SH3-containing adaptor-like protein that binds to gab-1. Biochem Biophys Res Commun 1998; 253:443-7. [PMID: 9878555 DOI: 10.1006/bbrc.1998.9795] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The SH2- and SH3-containing adaptor molecules serve to recruit cytosolic signal-transducing molecules to the activated receptor tyrosine kinases. In this study, we report the molecular cloning of a novel adaptor-like protein, Grap-2 (Grb-2 related adaptor protein 2), using the multisubstrate docking protein Gab-1 as bait in the yeast two-hybrid system. Sequence analysis revealed that Grap-2 contains a SH3-SH2-SH3 structure that has a high degree of sequence homology to those of the Grb-2 and Grap adaptor molecules. However, unlike in Grap and Grb-2, the SH2 and the C-terminal SH3 domains of Grap-2 are separated by a 120-amino-acid glutamine-rich sequence that shows no apparent homology to any known molecule or structural motif. The C-terminal SH3 domain of Grap-2 alone is sufficient to bind to Gab-1. Furthermore, Northern blot analysis demonstrated that Grap-2 has two major transcripts of 1.4 and 4.0 kb that can only be detected in tissues rich in leukocytes and in two leukemia cell lines. This highly restricted pattern of expression suggests that Grap-2 may participate in leukocyte-specific protein tyrosine kinase signaling.
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