Adult ; Aged ; Carbon Monoxide Poisoning ; blood ; pathology ; Creatine Kinase ; blood ; Female ; Humans ; Male ; Middle Aged ; Myocardium ; pathology ; Natriuretic Peptide, Brain ; blood ; Peptide Fragments ; blood ; Troponin I ; blood ; Young Adult

BACKGROUND: Vascular endothelial growth factor receptor 2 (VEGFR2) is primarily involved in vascular endothelial growth factor (VEGF)-mediated signal transduction and plays a critical role in the pathological angiogenesis that occurs in a number of diseases, including leukemia. Besides, VEGF secreted by leukemia cells also induces its own expression which leads to an enhanced production of VEGFR2 which contributes to the survival and proliferation of leukemia cells.OBJECTrVE: To evaluate the inhibitive effect of Lenti6/shVEGFR2 on the VEGFR2 expression and leukemia growth in mouse.DESIGN: A randomized, parallelized, controlled and open trial.SETTING: Department of Pediatrics, the Second Affiliated Hospital of Sun Yat-sen University; Biotechnology Research Center, Sun Yat-sen University.MATERIALS: The experiment had been done in the laboratories for Medical Research Center of the Second Affiliated Hospital, Sun Yat-sen University and Biotechnology Research Center, Sun Yat-sen University from May 2004 to January Lentiviral RNAi Expression System was purchased from Invitrogen, Co.,Ltd.; human VEGFR2 Mcb (PE) was purchased from R&D; CD31 immunohistochemistry kit was purchased from Boster, Co.,Ltd.; CD33-PE fluorescence labeled antibody was purchased from BD, Co.,Ltd.transiently and expression clone (Lenti6/shVEGFR2) was constructed, then cotransfected with ViraPowerTM Packaging Mix pU6/shVEGFR2 entry clone and transducting with Lenti6/shVEGFR2 expression clone, the effect on the development of intravenous xenograft leukemia mouse model, the distribution of microvessels in mouse bone marrow was observed after leukemia model mouse injected with recombinant lentivirus (group B); leukemia model mouse injected with recombinant lentivirus and endothelial cell (group C); leukemia model mouse injected with endothelial cell (group D). Through detecting changes of CD33 positive cells and microvessel density (MVD) in bone marrow, observing peripheral blood cell (PBC)smear and slice of liver, spleen, the effect of Lenti6/shVEGFR2 recombinant lentivirus on mouse leukemia was evaluated.mediated with lentivirus on VEGFNEGFR2 paracrine and autocrine loops in leukemia mouse.effective in inhibiting HL60 cell. pU6/shVEGFR2 entry clone constructed according to it had cell inhibitory rate as high as after transfection of pU6/shVEGFR2 entry clone and transduction of Lenti6/shVEGFR2 expression clone: 48 hours after transfection of pU6/shVEGFR2 entry clone and transduction of Lenti6/shVEGFR2 expression clone, the cell growth inhibitive rates were similar. However, the cell growth inhibitive rate of entry clone descended rapidly after 48 hours (P＜0.01); which of expression clone changed slowly, reaching the peak at 96 hours, dropped slightly, having no significance mouse: The amount of HL60 cells in bone marrow of groups A, B and C detected with flow cytometry were (25.8%±4.9)%, (14.3%±5.1)%, (8.4±2.6)%, respectively (P＜0.05); MVD in group C was obviously less than that in group D (P＜0.05); The amount of HL60 cells in leukemia model mouse injected with recombinant lentivirus and endothelial cell was the lowest as compared with the other groups.

Objective:To develop a convenient,economical and stable model of acute lung inflammation in mice.Methods:BALB/c mice were inhaled intranasally with 50 ?L of LPS(1 g/L) or sterile PBS,and sacrificed at different time points after being anaesthetized.The bronchoalveolar lavage fluid(BALF) was collected,and the lungs were separated and homogenated or embedded and sliced to 5 ?m sections,which were then stained by HE to determine the severity of inflammation.The inflammatory cell infiltration in bronchoalveolar lavage was counted and IL-1?,the pro-inflammatory cytokine,measured by ELISA in lung homogenate and BALF.Results:The data showed that administration with 50 ?g of LPS(1 g/L) for 2 h resulted in significant inflammation in the lung.LPS mainly stimulated the recruitment of neutrophils within 24 h.And LPS was a quick revulsant of IL-1? production in BALF and in lung tissue between 4 and 24 h.Macrophages and lymphocytes recruited after 1 day,and sustained for at least 3 days.Conclusion:The results indicate that intranasal administration of LPS can induce a rapid and stable acute inflammatory model in mice.

Objective:China was categorized as one of the 68 countdown countries to achieve the United Nations Millennium Development Goals (MDG) 5. This paper aimed to analyze the situation of maternal survival, and coverage of proven cost effective interventions in China, where specific attention was paid to disparities. Methods: National maternal and child mortality surveillance data were used to estimate maternal mortality ratio (MMR). Coverage for proven interventions was analyzed based on National Health Services Survey, where experts' consultations were made for complementation. Results: There had been a significant reduction of MMR in China, however great disparities existed, with rural Ⅱ to Ⅳ areas experiencing 2 to 5 times higher maternal mortality risks than urban areas and accounting for over 70% maternal mortality burdens. Postpartum hemorrhage, pregnancy associated hypertension, embolism and sepsis were the leading causes, and over 75% of the maternal mortality was caused by preventable or curable causes. Maternal health services utilization decreased in accordance with region' s development level. Socioeconomic factors like financial difficulties were the main obstacles hindering access of care.Even those who made deliveries in hospitals faced different probabilities in receiving qualified care according to their socioeconomic standings. Conclusion: China is on track to achieve MDG 5, however great disparities exist. It is necessary to specifically target rural types Ⅱ to Ⅳ areas. Major causes of maternal mortality which can be prevented or averted through the provision of essential obstetrical care. Yet as compared with maternity health needs, insufficient coverage of maternal and child health (MCH) care services and poor service quality are the leading predisposing factors contributing to maternal mortality in China.

Objective To retrospectively analyze the data of patients with T3N0-1M0 nasopharyngeal carcinoma (NPC) who underwent radiotherapy (RT) alone or concurrent chemoradiotherapy (CCRT), and to investigate the relationship between therapeutic modality and prognosis. Methods From January 2004 to December 2004, 781 patients with biopsy-proven newly diagnosed non-metastatic NPC were analyzed in Sun Yat-Sen University Cancer Center, who had MRI data of nasopharynx and neck. With restaged based on the Chinese 2008 staging system, 82 cases of T3N0-1M0 patients who were treated by RT alone or CCRT were enrolled. They were divided into group A (46 cases, RT) and group B (36 cases, CCRT). Results The clinical data was comparable between the two groups. The 5-year overall survival rate (OS) was 93.5 % (group A) and 100 % (group B)(P =0.046), while the 5-year disease-free survival rate (DFS) was 85.2 % (group A) and 91.7 % (group B) (P =0.498). N-Staging was the factor affecting the DFS. Stratified analysis showed that the 5-year OS of T3N0M0 patients was 94.7 % (group A) and 100 % (group B) (P =0.432), those of T3N1M0 patients were 92.6 %(group A) and 100 %(group B) (P =0.066), while the 5-year DFS was 73.7 % (group A) and 89.3 % (group B) (P =0.244). Multifactor analysis showed that CCRT was not the independent factor affecting the OS(HR =0.019; 95 % CI, 0 to 21.793), and N-stage was not the independent factor affecting the DFS (HR = 0.203; 95 % CI, 0.135 to 1.231×104). Conclusion For T3N0M0, NPC patients, CCRT is not superior to RT alone. Whether CCRT can improve survival of T3N1M0 NPC patients needs further study.

Objective To investigate the proliferation,apoptosis and cell cycle and possible mechanisms of different breast cell lines by difluoromethylorithine (DMFO).Methods The growth of breast cancer MDA-435 (ODC GG) cell lines and SK-br3 (ODC AA) cell lines treated with DFMO were observed.The apoptosis and cell cycle were detected by flow cytometry.PCR was applied to detect the changes of A and G alleles of ODC G316A in MCF-7 cells treated with DFMO.Results The growth inhibition rates of MDA-435 and SK-br3 cells treated with 10 mmol/L and 20 mmol/L DFMO after 48 h were 24.1％ and 33.6 ％,46.3 ％ and 53.5 ％,respectively,and there was statistical significance (t =2.134,P =0.021,t =2.213,P =0.019).The growth inhibition rates of MDA-435 and SK-br3 treated with 10 mmol/L and 20 mmol/L DFMO after 72 h were 28.9 ％ and 35.7 ％,54.3 ％ and 65.4 ％,respectively,and there was statistical significance (t =2.434,P =0.015,t =2.489,P =0.013).The apoptosis rates of MDA-435 (ODC GG) and SK-br3 (ODC AA) cells both dealt with 20 mmol/L of DFMO after 24 h,48 h and 72 h were (7.58± 2.06) ％ and (13.88±3.45) ％ (t =2.047,P =0.041),(43.28±14.28) ％ and (59.96±16.42) ％ (t =3.680,P =0.000),(77.87±30.25) ％ and (93.08±32.15) ％ (t =3.293,P =0.000 1),respectively.The proportions of S stage cells MDA-435 (ODC GG) and SK-br3 (ODC AA) cells under the same condition after 24 h,48 h and 72 h were (13.25±2.38) ％ and (12.89±2.21) ％ (P ＞ 0.05),(21.43±3.12) ％ and (12.24±3.55) ％ (t =2.638,P =0.012),(16.32±3.23) ％ and (15.24±3.01) ％ (P ＞ 0.05),respectively.After the treatment by DFMO,the expression of ODC G316A allele A in breast cancer cell line MCF-7 (ODC AG) was reduced (t =3.708,P =0.000),and the expression of G had no significant changes.Conclusion The proliferation inhibition and apoptosis in breast cancer cells treated by DFMO is different in breast cancer cells with different genetic type of ODC G316A.DFMO can inhibit the activity of ODC,and the mechanism may be that DFMO could selectively bind to ODC G316A allele A.

Visfatin was recently reported as an adipokine and was found to exert insulin-mimicking effects.The results showed that the expression of visfatin parallelled with obesity and insulin resistance in long term high fat chow-fed rats.The expression of visfatin mRNA was decreased and the insulin resistance improved after rennin-angiotensin system was blocked.Visfatin may play an important role in the pathogenesis of insulin resistance.

Objective To investigate the association of human leukocytes antigen(HLA)-DR/DQ with oral lichen planus(OLP) in the area of Yangtze River Delta. Methods HLA-DRB1 and DQB1 genotyping of 44 unrelated OLP patients and 150 normal controls were performed by polymerase chain reaction-sequence specific primers(PCR-SSP) method.The data were compared between the OLP group and normal controls,and between different types of OLP patients. Results The frequency of HLA-DRB1*09 and HLA-DRB1*07 alleles were significantly higher in OLP group than those in normal controls(56.8% vs 31.3% and 27.3% vs 13.3%,P

Animals ; Apoptosis ; radiation effects ; Electromagnetic Fields ; adverse effects ; Hippocampus ; pathology ; radiation effects ; Male ; Maze Learning ; radiation effects ; Rats ; Rats, Wistar

Objective To construct cDNA entry library and cDNA expression library of Armillifer agkistrodontis (A.) nymphs and make a preliminary immunoscreening for the cDNA expression library.Methods The nymphs were collected from the Kunming mice infected experimentally with A.agkistrodontis eggs and the total RNA were extracted from the nymphs using TRIzol Reagent.After purifying the mRNA,the synthesized cDNAs were cloned into the donor vector pDONR222 by BP reaction of Gateway technology and the recombinants were transformed into the DH10B cells by electroporation,the cDNA entry library was obtained.Next,the expression vector pDEST17 was ligated with entry clones by LR reaction,and the recombinants were transformed into the BL21 (DE3) cells.Hence,the cDNA expression library was constructed.Then,the expression library was immunoscreened with the mixed sera of mice infected with A.agkistrodontis,and the insertions of positive clones were sequenced.After that,the open reading frame(ORF) of positive slone sequence,the homology of the screened genes and their encoded proteins were analyzed by Finder and BLAST (basic local alignment search tool) program of National Center of Biotechnology Information(NCBI),and the discovered new genes were submitted into the GenBank.Besides,the physico-chemical properties,secondary structure and B cell epitopes of encoded proteins were also analyzed by bioinformatics software.Results The average titer and total clones of the cDNA entry library were 1.45 × 105 CFU/ml(colony-forming unit,CFU) and 1.74 × 106 CFU,respectively,and the range of fragment length of the inserted cDNA was between 0.2-4.0 kb,with an average of 1.4 kb.The total clones of cDNA expression library were 1.00 × 105 CFU,and the fragment length of the inserted cDNA was between 0.3-2.2 kb,with an average of 1.0 kb.Five positive clones,coded S1,S5,A1,D1 and F1,respectively,were obtained through preliminary immunoscreening.The sequence and homology of the five positive clones were sequenced and analyzed by BLAST program.No significant similarities were found in pentastomida species,which meant that they were all novel genes of A.agkistrodontis.The gene sequences were submitted to GenBank,with the accession number from JQ180451 to JQ180455.Also,results obtained by bioinformatics software showed that the predictive encoding proteins were all potential to be valuable recombinant diagnostic antigens.Conclusions The cDNA library of A.agkistrodontis nymphs is successfully constructed,and five new genes of A.agkistrodontis are discovered.The establishment of cDNA library and the discovery of the new genes will lay a foundation for further studying the gene functions and screening the immunodiagnostic antigens.