OBJECTIVE To investigate the pathogenic distribution and drug resistance of nosocomial infection occurred in pediatric patients with hematologic malignancy and therefore provide the information in rational administration of antibiotics to pediatric patients with hematologic malignancy complicated with nosocomial infection.METHODS Flora cultivation and isolation were operated with the routine methods and drug-sensitivity was determined by Kirby-Bauer method.RESULTS Totally 116 strains of pathogenic bacteria were isolated,in which included 78 strains of G-bacteria and 38 strains of G+ bacteria.Fungi were also very common.In this study,both G-and G+ bacteria were resistant to antimicrobial agents tested.CONCLUSIONS The bacterial spectrum and their drug-resistance characteristics in pediatric patients with hematologic malignancy are quite different to that encountered in pediatric patients with other systemic diseases.Most strains present high resistance to antibiotics,so our administration of antibiotics for nosocomial infections should be directed and carry out according to the susceptibility tests in different area and different periods.

Objective To compare transfection properties of two different fluorescently labeled PIK3CA siR-NA and to screen out PIK3CA siRNA with high transfection efficiency and strong anti-quenching ability.Methods Two different fluorescently labeled PIK3CA siRNA was transfected into gastric cancer cell BGC-823 by Lipofectamine 2000.The distribution and quenching of fluorescence were observed by inverted fluorescence microscope.Image J software was used to analyze their transfection efficiency.Real-time quantitative PCR was performed to detect the effect of different fluorescently labeled PIK3CA siRNA on PIK3CA mRNA expression.Results The transfection efficiency and anti-quenching ability of two different fluorescently labeled PIK3CA siRNA were different under the same transfection conditions.The transfection efficiency showed no significant differences between Cy3 or FAM labeled PIK3CA siRNA and negative control siRNA(P ＞ 0.05),but the transfection efficiency of Cy3 labeled PIK3CA siRNA and negative control siRNA was significantly higher than the FAM labeled (P ＜ 0.05).Inhibitory efficacy of target mRNA expression induced by Cy3 labeled PIK3CA siRNA was significantly higher than that of FAM labeled PIK3CA siRNA.Conclusion Cy3 labeled PIK3CA siRNA could act as a good tracer and provide an important evidence for further construction of Cy3 labeled PIK3CA siRNA nanoparticle.

Objective To study the mechanism of 5 fluorouracil(5 FU) in the treatment of severe acute pancreatitis(SAP). Methods SD rats were randomly divided into three groups:acute pancreatitis group (AP group,n=12), 5 FU treatment group( 5 FU group,n=10),and control group (n=10). In 5 FU group,5 FU(1mg/100g) were injected immediately after AP was induced.12h after the AP was induced, blood samples were taken to determine nitric oxide(NO) and interleukin 6(IL 6). Results Compared with AP group,in 5 FU group, the survival rate increased,mean survival time prolonged,ascites volume decreased significantly,and the inflammatory mediators subsided. Conclusions NO and IL 6 may play an important role in the pathogenises of acute pancreatitis. The treatment effect of 5 FU for AP may through inhibit the inflammatory mediators.

One hundred and twenty stroke patients were randomly divided into rehabilitation group (n =60) and control group (n =60).Patients were assessed with National Institute of Health Stroke Scale (NIHSS) ,Fugl-Meyer Assessment (FMA),Bathel Index (BI) and World Health Organization Quality of Life Assessment Instrument Brief Version(WHOQOL-BREF) before and 6 weeks after treatment by the same doctor.The scores of NIHSS,FMA,BI and WHOQOL-BREF were improved significantly in rehabilitation group after treatment; while those of control group were no improved.The scores after treatment of rehabilitation group were significantly higher than those of control group ( P ＜ 0.05 ).

Aim To observe the influences of ginsenoside Rg1 on the spontaneous contraction of small intestine smooth muscle of rabbits in vitro and explore the mechanism.Methods With the isothermal perfusion of small intestine in vitro,the influences of ginsenoside Rg1 on the spontaneous contraction of small intestine was observed and the mechanism of ginsenoside Rg1 was studied.Results Ginsenoside Rg1 reduced the amplitude of contraction of small intestine smooth muscle in rabbits in a dose-depended manner.Bay K8644 and nitro-L-arginine methylester(L-NAME)could completely block the inhibition of ginsenoside Rg1 on the contraction of small intestine smooth muscle.Ginsenoside Rg1 inhibited the intracellular calcium-depended contraction induced by rynodine in the Ca2+ free Tyrode's solution.Conclusions Ginsenoside Rg1 inhibits the contraction of small intestine smooth muscle of rabbits in vitro.The mechanism may be related to increase NO concentration in small intestine smooth muscle so that it inhibits extracellular Ca2+ inflowing via cell membrane and intracellular Ca2+ releasing via sarcoplasmic reticulum.

Objective To study the expression of transforming growth factor -β1 (TGF -β1 )in myocardial tissue and the concentration of serum B -type natriuretic peptide (BNP)in myocardial remodeling of SD rats induced by isoproterenol (ISO)and the effects of carvedilol intervention.Methods According to random number table,30 male SD rats were divided into 3 groups:(1 )after 9 g/L saline was injected with 5 mL/(kg·d)for 1 0 days,9 g/L sa-line was used at the dose of 1 0 mL/(kg·d)by way of gavage for 4 weeks in the control group (n =1 0);(2)after ISO was injected with 5 mg/(kg·d)for 1 0 days,9 g/L saline was used at the dose of 1 0 mL/(kg·d)by way of gavage for 4 weeks in the model group (n =1 0);(3)after ISO was injected with 5 mg/(kg·d)for 1 0 days,carvedilol was used at the dose of 1 0 mg/(kg·d)by way of gavage for 4 weeks in the treatment group (n =1 0).Then,all the rats were killed and the cardiac weight index (CWI)was measured.The pathological changes of myocardial tissue were ob-served through HE staining and Masson staining.The mRNA expression of TGF -β1 was detected by adopting reverse transcription -polymerase chain reaction.The protein of TGF -β1 was detected by means of immunohistochemistry and Western blot.The concentration of serum BNP was tested by adopting enzyme -linked immuno sorbent assay.Results (1 )Pathological changes by light microscope:no significant pathological changes were observed in myocardial tissue of the control group.The denaturization,hypertrophy,edema,necrosis of myocardial cells and collagen fibers increased in myocardial tissue of the model group were more serious than those of the treatment group.(2)CWI:CWI of the model group[(3.31 ±0.07)mg/g]was significantly higher than that of the treatment group[(3.03 ±0.04)mg/g],and CWI of the treatment group was significantly higher than that of the control group[(2.98 ±0.1 0)mg/g].There was significant difference among 3 groups (F =54.383,P =0.000).There was also significant difference between any 2 groups (all P <0.01 ).(3)The level of TGF -β1 of myocardial tissue:the level of TGF -β1 of the model group was significantly higher than that of the treatment group,and the level of TGF -β1 of the treatment group was significantly higher than that of the control group by using three detection methods.There was significant difference among 3 groups (F=1 3.62,P =0.000).There was also significant difference between any 2 groups (all P <0.01 ).(4)The concentration of serum BNP:the concentration of serum BNP of the model group[(61 .1 3 ±2.00)ng/L]was significantly higher than that of the treatment group[(57.08 ±1 .52)ng/L],and the concentration of serum BNP of the treatment group was sig-nificantly higher than that of the control group[(51 .56 ±1 .80)ng/L].There was significant difference among 3 groups (F =72.81 ,P =0.000).There also was significant difference between any 2 groups (all P <0.01 ).Conclusions The expression of TGF -β1 in myocardial tissue was up -regulated and the concentration of serum BNP was increased in my-ocardial remodeling of SD rats induced by ISO.The carvedilol intervention can down -regulate the expression of TGF -β1 and decrease the concentration of BNP,then inhibit myocardial remodeling,and improve cardiac function.

Objective Currently,the sit-to-stand process is not well evaluated.The aim of the study is to evaluate quantitatively the reliability of posturographic parameters in the sit-to-stand process.Methods Seventy-four healthy participants were enrolled and required to finish 20-second sitting,standing and the sit-to-stand process.The computer calculated the posturographic parameters automatically.The test was repeated twice to assess the reliability at an interval of six days.Results During sitting and standing position,the intraclass correlation coefficients (ICCs) of all the parameters were above 0.50,indicating a good or fair reliability.During the standing stance and sitting phase of the sit-to-stand process,the ICCs of all the parameters were above 0.40 and 0.60 respectively,showing a good or fair reliability.Conclusions Sit-to-stand posturographic parameters are a new way to assess the position control ability among the healthy participants with a good reliability.Further study should be conducted among patients to result in better functional and effectiveness evaluation.

OBJECTIVETo explore the expression change of stem cell-derived neural stem/progenitor cell supporting factor (SDNSF) gene in the injuried spinal cord tissues of rats, and the relation between the expressions of SDNSF and nestin.

METHODSThe spinal cord contusion model of rat was established according to Allen's falling strike method. The expression of SDNSF was studied by RT-PCR and in situ hybridization (ISH), and the expression of nestin was detected by immunochemistry.

RESULTSRT-PCR revealed that SDNSF mRNA was upregulated on day 4 after injury, peaked on day 8-12, and decreased to the sham operation level on day 16. ISH revealed that SDNSF mRNA was mainly expressed in the gray matter cells, probably neurons, of spinal cord. The immunohistochemistry showed that accompanied with SDNSF mRNA upregulation, the nestin-positive cells showed erupted roots, migrated peripherad and proliferation on the 8-day slice. However, the distribution pattern of these new cells was different from that of SDNSF-positive cells.

CONCLUSION(1) SDNSF is expressed in the gray matter of spinal cord. The expression of SDNSF mRNA in the spinal cord varies with injured time. (2) The nestin-positive cells proliferate accompanied with spinal cord injury repair, but do not secrete SDNSF.

Analysis of Variance ; Animals ; Disease Models, Animal ; Female ; Gene Expression Regulation ; physiology ; In Situ Hybridization ; methods ; Intermediate Filament Proteins ; metabolism ; Nerve Tissue Proteins ; metabolism ; Nestin ; RNA, Messenger ; biosynthesis ; Rats ; Rats, Sprague-Dawley ; Reverse Transcriptase Polymerase Chain Reaction ; methods ; Spinal Cord Injuries ; metabolism ; Time Factors ; Vesicular Transport Proteins ; genetics ; metabolism

This study was purpose to investigate the expression levels of HSP70 and MDR1 genes under heat shock and/or adriamycin (ADM) chemotherapy stimulation. The K562 cells were bathed in water at 43 degrees C for 1 hour, then the heat-treated K562 cells were collected and were cultured at 37 degrees C. The expression of HSP70 was assayed by immunocytochemistry, the growth suppression rate of K562 cells was detected by MTT assay, the function of P-gp and the expressions of HSP70 mRNA, MDR1 mRNA were detected by flow cytometry and real-time quantitative PCR (RT-PCR) respectively. The results showed that (1) the synthesis of HSP70 protein in K562 cells treated with high shock (43 degrees C) reached to high level after culture at 37 degrees C for 2 hours, and moved from cytoplasm to nucleolus, the expression of HSP70 began to decrease following 3 hours of culture at 37 degrees C, and gradually reached to normal level after culture at 37 degrees C for 5 hours, the location of HSP70 expression returned to cytoplasm; (2) the expressions of HSP70 mRNA and MDR1 mRNA increased following 43 degrees C heat shock, and were 4 and 5.8 times higher than that of control group at 37 degrees C culture for 2 hours respectively; (3) the expression of P-gp was higher in ADM group than that in control. The expressions of HSP mRNA and MDR1 mRNA increased significantly in heat shock plus ADM group and ADM group as compared with control (p<0.01). It is concluded that the heat shock and ADM chemotherapy both induce over expression of HSP70 and MDR1 which can maintain stability of K562 cells and may be related to formation of the MDR in leukemia.
ATP-Binding Cassette, Sub-Family B, Member 1 ; metabolism ; Antibiotics, Antineoplastic ; pharmacology ; Cell Proliferation ; Doxorubicin ; pharmacology ; HSP70 Heat-Shock Proteins ; metabolism ; Heat-Shock Response ; Humans ; K562 Cells ; RNA, Messenger ; metabolism

OBJECTIVETo investigate the clinical effects of close reduction and minimally invasive percutaneous plate osteosynthesis in treating proximal humerus fractures in the aged.

METHODSFrom February 2012 to December 2013,39 patients with proximal humerus fractures were treated with minimally invasive percutaneous plate osteosynthesis (MIPPO group, 21 cases) and open reduction internal fixation (ORIF group, 18 cases). Including 17 males and 22 females in the study, and aged from 67 to 88 years old with an average of (71.8 ± 5.2) years old. In MIPPO group, there were 11 males and 10 females with an average age of (70.0 ± 5.3) years old;and in ORIF group, there were 10 males and 8 females with an average age of (72.0 ± 4.2) years old. Operation time, blood loss during operation, fracture healing time and postoperative complications were recorded. The functions of the shoulder joints were assessed according to Constant-Murley score at final follow-up.

RESULTSAll the patients were followed up from 11 to 27 months with an average of 18.1 months. The mean blood loss of the MIPPO group was (176.0 ± 57.4) ml,while the ORIF group was (356.0 ± 66.9) ml (t = 7.22,P = 0.01). The operation time of the MIPPO group was (47.4 ± 14.9) min, while the ORIF group was (92.7 ± 15.8) min (t = 0.79, P = 0.03). Fracture healing time in the MIPPO group and ORIF group was (17.6 ± 5.8), ( 21.7 ± 4.9) weeks, respectively (P < 0.05). The mean Constant-Murley score at final follow-up was 89.7 ± 14.5 in MIPPO group, and 81.8 ± 13.2 in ORIF group (P < 0.05).

CONCLUSIONMIPPO has advantages of little trauma, less blood loss, rapid recovery, less vascular damage and so on and can effectively treat the proximal humerus fracture in the aged.

Aged ; Aged, 80 and over ; Bone Plates ; Case-Control Studies ; Female ; Fracture Fixation, Internal ; methods ; Humans ; Male ; Minimally Invasive Surgical Procedures ; Shoulder Fractures ; surgery