Objective To establish a cisplatin-resistant 4T1 mouse model of triple negative breast cancer .Meth-ods A drug resistant mice model was established with cisplatin ( DDP ) induction and in-vivo/in-vitro tumorigenic ap-proach.Its resistance characteristics were identified by MTT assay .Changes of drug resistance gene ( MDR1, BCRP, MMP7, GST-π) and protein ( P-gp, BCRP, MMP7) expression, and phosphorate-Akt and total-Akt protein expression were evaluated by real-time PCR, immunohistochemistry and western blot method , respectively.Small animal live imaging technology was applied to detect tumor growth .Results Resistance fold (RF) of cisplatin-resistant 4T1 mouse model was 12.84.The expression of MDR1, BCRP, MMP 7, GST-πmRNA and P-gp, BCRP, MMP 7 proteins in the resistant mice were higher than that in the non-resistant mice .The result of western blot showed that a statistically higher expression of p-Akt in resistant mice than that in non-resistant mice at protein levels (P<0.01).No significant difference of tumor growth rate was observed between non-resistant and resistant mice ( P>0.05 ) .Given same dose of DDP , resistant mice showed lower sensitivity than non-resistant mice significantly (P<0.01).Conclusions We have successfully established a cis-platin-resistant triple negative breast cancer model in mice , which provides a new platform for further study on chemoresis-tant reversal strategy and individualized clinical treatment of this disease .

Objective To explore the diagnosis and surgical treatment of primary intestinal tumors, and improve the level of treatment. Methods Retrospective analysis of the clinical was made on the 68 cases of primary small intestinal tumors confirmed by pathological examination in our department in recent 20 years. HZ Results 34.8%(21/68) was benign tumors in 68 cases, and 69.1%(47/68) was malignancies. The common clinical prevsentations were abdominal pain (69.1%,47/68). gastrointestinal he morrhage (41.1%,28/68) and abdomen mass (13.2%,9/68). The preoperative misdiagnosis rate was 70.5%(48/68) .All the 68 cases performed operation, and no death. The 1 ,2 and 5 years survival rates of malignant tumors were 65.8%,42.1% and 29.3% respectively. Conclusions The clinical presertation of primary small intestinal tumor is non-spectific and the misdiagnosis rate is high. Kinds of diagnosis examinations should be done for the cases whose diagnosis are uncertain, and laboratory examinations should be considered if it is need. The main choice of treatment is surgery and the chemotherapy is necessary for malignant tumors also.

Background:Personality characters will influence the future career planning and development of medical students.Therefore,it will be important in the field of medical education to survey their personalities.Study design:The personality questionnaire was developed according to the Big-Five characters.The content validity and consistent reliability were assessed.A total of 124 undergraduate medical students participated in this 44-item self-evaluation about their personalities.Results:The inter-item consistency reliabilities of the 44-items of Big-Five personality questionnaire were analyzed and discordant items were deleted(Crobach's Alpha from 0.484~0.782 before selection to 0.67~0.82 after selection).The content validity of this five dimensions ranged from 0.8 to 0.9(P

Objective:To promote hospital medicalmetrology and quality control management. by using information management mode.Methods: Through the analysis of our hospital medical equipment measurement and quality control management present situation, put forward the necessity of metrology and quality control management of Xinxi sanitary equipment,introduces the application situation of our hospital dynamic health equipment metrology and quality control management system.Results: The medical equipment metrology and quality control management system perfect the medical equipment measurement and quality control of management process, improve the qualified rate of equipment.Conclusion:Application of sanitary equipment measurement and quality control management platform to improve the delivery rate of equipment, ensure the equipment unqualified clinical use.

BACKGROUND:Granulocyte colony-stimulating factor (G-CSF) can strongly mobilize bone marrow hematopoietic stem cells (HSCs). It has been proved that G-CSF has the ability to mobilize both HSCs and mesenchymal stem cells (MSCs).OBJECTIVE:To investigate the therapeutic effect of G-CSF in mobilizing autologous bone marrow stem cells entering cerebral infarction zone on ischemic cerebral infarction in rats.DESIGN:A randomized grouping design, animal experiment.SETYING: Center for Stem Cell Biology and Tissue Engineering of Sun Yat-sen University.MATERIALS: This experiment was carried out at the Animal Experimental Department of Sun Yat-sen University (North District) and Center for Stem Cell Biology and Tissue Engineering of Sun Yat-sen University from September 2004 to January 2005. Totally 200 male Wistar rats were chosen and randomly divided into autologous bone marrow stem cells transplantation group and control group, with 100 rats in each group.METHODS:Rats of two groups were made cerebral infarction models by line occlusion. Transplantation group introduced intraperitoneal injection of 60 μg/kg G-CSF one hour after operation. The control group introduced intraperitoneal injection of saline of the same dosage at the same time. ①All rats were weighed before operation and 24 hours, 48 hours, one week after operation to evaluate body mass loss rate. They were also given neurological grading. Grading criteria: Grade 0 is normal. Grade Ⅰ is that the right forelimb bends. Grade Ⅱ is that the right forelimb grasped weakly when the tail is lifted. Grade Ⅲ is that the rat has no directivity in automatic action and circumrotates to right when the tail is lifted. Grade Ⅳ is that the rat circumrotates to right in automatic action. ②15 rats in each group were selected. 24 hours, 48 hours, one week after operation, we opened the skulls, took out the brain and used 2,3,5-Triphenyltetrazoluim Chloride (TTC) staining to measure infarction volume, hematoxylin-eosin(HE) staining to observe the pathological change , and immunohistochemistry to detect the infiltration of CD34+ cells.MAIN OUTCOME MEASURES:Body mass loss rate, neurological grade,infarction volume, pathological change and infiltration of CD34+ cells.RESULTS: Totally 180 of 200 rats were successfully made cerebral infarction model. 48 rats died in seven days after operation. As a result, 132 rat models were alive and 120 rats were randomly selected for data analysis. ①Measurement of body mass and neurological grading: There was no significant difference in body mass loss rate between two groups 24 hours and 48 hours after operation (P ＜ 0.05);one week after operation, body mass loss rate was significantly lower in transplantation group [(10.5±8.2)%]than in control group [(17.8±7.1)%] (P ＜ 0.05). There was no significant difference in neurology grade between two groups. ②Infarction volume:Infarction volume and the percent of infarction volume in the whole brain in control group were all higher than those in the transplantation group,with significant difference [ (251.69±52.77) mm3 vs(145.72±28.05)mm3,(17.00±2.69)% vs (9.90±1.62)% ,P ＜ 0.01]. ③Pathological change: 24 hours after operation, the brain tissue of two groups got classical pathological change of cerebral ischemia infarction. There were some mono-nucleus cells infiltrating in transplantation group while none in control group. 48 hours after operation, most nerve cells disappeared and the glial cells were degenerated. There were many mono-nucleus cells infiltrating in transplantation group while a few in control group. One week after operation, tissues in the infarction zone were liquescent with many monocaryons and lymphocytes infiltrating around them in control group. In transplantation group, part of the infarction zone was plerosised through proliferation of newly born capillaries and glial cells and inflammatory cells were not evident. ④Immunohistochemistry: CD34+ mono-nucleus cells were detected in the ischemic territory in transplantation group 24 hours after operation while none in the brain of other side and control group. There were CD34+ mono-nucleus cells and pyramidate cells with mutations in transplantation group 48 hours after operation while none in the brain of other side and control group.CONCLUSION:The stem cell transplantation in situ therapy, which employs self-marrow stem cells mobilized by G-CSF can relieve the ischemic degree and reduce the infarction volume.

BACKGROUND: Differentiation of bone marrow mesenchymal stem calls(BMSCs) is associated with their microenvironment. After acute myocardial infarction (AMI), the necrosis of cardiomyocytes caused activation of complement, generation of free radical, and secretion of various cell factors. As a result, the ingredients of patients' serum also changed, so does the changes will influence the differentiation of BMSCs into cardiomyocytes? And what influence it will be? OBJECTIVE: To investigative effects of AMI rat serum on the differentiation of BMSCs into cardiomyocytes. DESIGN, TIME AND SETTING: The in vitro controlled cytology experiment was performed at the Laboratory of Center for Stem cells and Tissue Engineering, Sun Yat-sen University from September in 2005 to June in 2006. MATERIALS: SPF Sprague Dawley rats, weighing 50-80 g, aged 3-4 weeks, were used for culture of BMSCs, and SpragueDawley rats, weighing 200-300 g, aged 6-8 weeks, were used for making AMI models. METHODS: BMSCs were isolated and cultured with the adherent method. After making AMI rat models by deligating anterior descending of the left coronary artery, the serum were collected and centrifuged from AMI and normal rats. Then the passage 3 of BMSCs were divided into six groups, non-induction group, 5-azacytidine (5-aza) group, 5-aza plus serum from AMI rat group, 5-aza plus serum from normal rat group, serum from AMI rat group, and serum from normal rat group. MAIN OUTCOME MEASURES: Morphology changes in rat BMSCs after induction; Expression of cardiac troponin T of BMSCs after induction; Expression of GATA-4 and desmin mRNA of BMSCs after induction. RESULTS: After being induced by 5-aza and two kinds of serum, some cells became elongated and thinner. Two to three weeks after induction, some cells had a ball-like or rod-like appearance, and connection were formed between adjacent cells. It showed that some BMSC have differentiated into cardiac like cells. The expression of cardiac troponin T, GATA-4 and desmin were positive in cells differentiated from BMSCs. The troponin T expression in control group and simple serum induction group were negative, but GATA-4 and desmin expressed weakly. CONCLUSION: Serum from AMI rat cannot induce BMSCs to differentiate into cardiomyocytes alone, but it promotes BMSCs induced by 5-aza differentiating into cardiomyocytes and facilitates the differentiated calls into mature.

Objective To explore the effect of prevention of hemorrhagic cystitis (HC) after hematopoietic stem cell transplantation (HSCT) with hyperhydration, forced diuresis and alkalinizing plus infusion mesna. Methods 32 cases of patients receiving HSCT were included in this study. 2 cases of severe aplastic anemia (SAA) received total body irradiation (TBI)+cyclophosphamide(CTX)(TBI-CTX) regimen,and the remaining 30 patients were using the classic busulfan+CTX (BU+CTX) regimen. All patients were treated with mesna combined with hydration, forced diuresis and alkalization to prevent HC. Ganciclovir and acyclovir were used to prevent cytomegalovirus (CMV) and other viral infections and monitor CMV-IgM levels of the blood. Encourage patients to urinate every hour, testing urine pH value and the calculation of urine output, every 6 h review and testing of urine routine,central venous pressure (CVP), each of 8 h of serum electrolytes. Results Only 1 patient at 6 months after transplantation appeared delayed grade Ⅱ HC after hydration, alkalization, diuretic, hemostatic, anti-graft-versus-host disease (GVHD), and ganciclovir antiviral therapy. The HC patients cured at 35 d. The remaining patients did not suffer HC. Adverse effects such as acid-base balance disturbance did not appear clear. Conclusion Mesna joint hydration, forced diuresis and alkalization was effective and safe to prevent HC.

Objective To investigate the treatment effects of dahuang gancao decoction on lung Injury complicated by acute necrotizing pancreatitis and explore its mechanism. Methods 90 Wistar rats were randomly divided into 3 groups, namely sham-operated group (SO), ANP group (ANP), dahuang gancao decoction treatment group (DG). 4% sodium taurocholate was injected into the pancreatic duct to induce ANP. Dahuang gancao decoction(0.25 g/ml) 0.6 ml/100 g weight was gavaged in the DG group, the same volume of normal saline was gavaged in the SO and ANP group, which was repeated 12 h later. After 6 h, 12 h, 24 h, all rats were sacrificed, pancreas and lung tissues were harvested to observe the pathological changes and the pathological changes were scored. IL-6, IL-10, TNF-α levels of serum and lung tissue were measured,and the changes of toll-like receptor 4 (TLR4) expression in lung tissue was determined by immunohistochemical method. Results 12 h after ANP induction, the serum levels of IL-6 in SO, ANP, DG group were (14.4±4.0)pg/ml, (171.4 ±41.3)pg/ml, (156.9 ±34.7)pg/ml; the serum levels of IL-10 were (13.7 ±4.5)pg/ml, (120.5 ±23.7)pg/ml, (148.3 ±44.4)pg/ml; the serum levels of TNF-α were (22.4 ±4.7)pg/ml, (261.3 ±51.4)pg/ml, (235.3 ±45.9)pg/ml; the lung tissue levels of IL-6 were (257.3 ±55.9)pg/ml,(2578.3 ±403.0)pg/ml,(2370.0 ±491.0)pg/ml; the lung tissue levels of IL-10 were (80.8 ±20. 8)pg/g, (642.0 ± 107.3)pg/g, (695.3 ± 151.7) pg/g, the lung tissue levels of TNF-α were (207.6 ±98.6)pg/g, (1769.1 ±635.6) pg/g, (1401.1 ±450.5) pg/g; the pancreas pathological scores were 0, 7.00 ±1.33, 6.30 ± 0.95; the lung pathological scores were 0, 6.30 ± 1.42, 5.60 ± 0.97; the expressions of TLR4in lung tissue were 0.09 ± 0. 03, 0.59 ± 0. 09, 0. 52 ± 0. 08. The values in the ANP and DG groups were significantly higher than those in SO group (P < 0. 01 ); except for IL-10, all values in the DG groups were significantly lower than those in ANP group (P < 0.05); there was a positive association between lung and pancreas scores (r =0.807, P<0.01), and lung score was positively associated with the expression of TLR4(r = 0.519, P < 0.01 ). Conclusions Dahuang ganeao decoction may quickly improve lung injury complivated by ANP. The mechanism may involve inhibiting the expression of TLR4 and down-regulating the expression of IL-6, TNF-α, up-regulating the. Expression of IL-10.

Objective:To construct a bait vector for HSPC238, and to screen the target proteins which interact with the HSPC238.Methods:Gene synthesis method was used to synthetic gene HSPC238, then connected with the pGBKT7 vector after digesting by the sfiIA and sfiIB,to obtain the bait plasmid pGBKT7-HSPC238,then transferred into the yeast strains AH109 with the empty plasmid pGBKT7after sequencing,to observe its self-activating effect in the nutrient deficiencies medium,and further to screen the target proteins which interact with HSPC238 from the human fetal liver cDNA library.Results:The bait vector pGBKT7-HSPC238 was successfully constructed,and it had no self-activating effect through the phenotypic screening,after the yeast two-hybrid technology with literature analysis,we preliminary screened and found that the ribosomal protein L5(RPL5) may be the one of the target proteins which interacted with HSPC238 from the human fetal liver cDNA library.Conclusion: We successfully constructed the bait plasmid vector PGBKT7-HSPC238,and after the yeast two-hybrid technology with literature analysis,we preliminary screened and found that the ribosomal protein L5( RPL5) may be the one of the target proteins which interacted with HSPC238.

Objective:To investigate the effect of HSPC 238 overexpression or low expression on the regulation of the target protein ( HMOX1, MT2A, UBB, RPS27a ) and the regulation pathways.Methods: To construct the interference vector and overexpression vector of HSPC238 respectively,transfected the HEPG2 cell lines by the liposome method,detect the expression of mRNA and protein of the HSPC 238 and the target proteins by the RT-PCR and Western blot , further to transfer the overexpression plasmids of the target proteins into the HEPG 2 cell lines which had been transfected with interference vector and overexpression vector of HSPC238,the experimental group cell lines were treated with proteasome inhibitor MG 132,to purify the target proteins with nickel column,do immunoblotting with HSPC238 to detect the accumulation situation of the target proteins.Results: The HMOX1,MT2A, RPS27a were downregulated obviously when the HSPC 238 was interfered exogenous;and the MT2A,UBB,RPS27a were up-regulated after the HSPC238 overexpressed.The overexpression plasmid of target proteins were transfected into the HEPG 2 cell lines which have been transfected with interference vector and overexpression vector of HSPC 238 ,compared with the control group ,the target protein band in the experimental group was significantly increased after treatment with the proteasome inhibitor MG 132.Conclusion:The HSPC238 overexpression can upregulate the expression of MT 2A,UBB and RPS27a,and interfering HSPC238 can downregulate the expression of HMOX1,MT2A and RPS27a;the HSPC238 target protein may play a regulatory role through the UPP pathway;the HSPC238 may play a regulatory role on the target proteins through the UPP pathway.