OBJECTIVE To probe current status on protection of occupational exposure for contract workers in supply center of military hospital,therefore to put forward rational suggestion and measure.METHODS Current status among contract workers in supply center of military hospital were investigated by questionnaire with conversation.RESULTS The investigation showed that contract workers in supply center of military hospital had poor recognition on protection of occupational exposure,with higher prevalence of occupational exposure(95%),and short of effective protection against occupational exposure,and without correct and efficient measures once occupational exposure occurred.CONCLUSIONS It is essential to enhance education on occupational exposure protection,establish strict,systemic and periodic training,thus to strengthen self-protection on occupational exposure,therefore to reduce the occurrence of inhospital infection.

Objective To investigate the role of TROP2 in migration and invasion of human gastric cancer cells. Methods Small interfering RNA(siRNA) targeting TROP2 gene was constructed by gene cloning and transfection into gastric cancer cell line BGC-823. The expression of mRNA and protein were detected by Real-time quantitative PCR and Western blot assay after RNA interference. The proliferation was determined by MTT assay. Transwell assay was performed to assess the effect of TROP2 targeted RNA interference on the migratory and invasive properties of gastric cancer in vitro. Results Enzyme digestion analysis and DNA sequencing showed that TROP2 targeted RNA interference recombinant plasmids were successfully constructed. The most effective recombinant plasmid was selected. After transfection, knockdown of TROP2 significantly inhibited the proliferation, migration and invasion of BGC-823 cells in vitro(P <0. 05). Conclusion Interfering and down-regulating TROP2 gene can inhibit migration and invasion of gastric cancer cell line BGC-823 in vitro, indicating that TROP2 gene is a potential target for gastric cancer gene therapy.

Objective:To explore the correlation among ECG indexes,myocardial enzyme peak and short term cardi-ac function in patients with acute anterior ST elevation myocardial infarction (STEMI).Methods:A total of 150 pa-tients with acute anterior STEMI were selected from our hospital.According to left ventricular ejection fraction af-ter three months (3m LVEF),they were divided into cardiac dysfunction group (n=78,LVEF<50%)and normal cardiac function group (n= 72,LVEF≥ 50%).Following indexes were compared between two groups,including sum of ST elevation extent (ΣST),R wave (ΣR),Q wave (ΣQ),maximum value of ST elevation (STm)and Q wave (Qm)etc.on infarct related leads,and peak value of creatine kinase (CKm),CK isoenzyme (CK-MBm)and cardiac troponin T (cTnTm)etc.Results:Compared with normal cardiac function group,there were significant rise in ΣST,ΣQ,STm,Qm,CKm,CK-MBm,cTnTm,left ventricular end-diastolic diameter (LVEDd),3mLVEDd and significant reduction in ΣR and LVEF,3mLVEF in cardiac dysfunction group,P <0.05 or <0.01;Spearman correlation analysis indicated that ΣST,ΣQ,STm,Qm,CKm,CK-MBm and cTnTm were positively correlated with 3m LVEDd (r =0.18~0.63,P <0.05 or <0.01),and inversely correlated with 3m LVEF (r =-0.88~-0.42, P <0.01 all).ΣR was inversely correlated with LVEDd and 3m LVEDd (r =-0.46、-0.51,P <0.01 both),and positively correlated with LVEF and 3m LVEF (r =0.81,0.71,P <0.01 both).Conclusion:In patients with ante-rior STEMI,the higher ST elevation,the higher Q wave,the lower R wave,the higher myocardial enzyme peak is, the poorer short term cardiac function is.

Objective To evaluate the prognosis-related factors of colorectal cancer patients with positive PD-L1 expression in liver metastases after hepatectomy. Methods We reviewed retrospectively the clinical data of 68 colorectal cancer patients with positive PD-L1 expression in liver metastases receiving personalized comprehensive treatment which was mainly consisted of surgical resection. We observed the results and prognosis after surgical resection and analyzed related factors. Results Univariate analysis showed that no radiotherapy, N stage, RAS mutation status, T stage, dMMR, Duck stage, disease free interval from primary to metastases≤12 months and largest hepatic tumor diameter > 5 cm had obvious significance (all P < 0.05). Multivariate logistic analysis regression revealed that without dMMR (P=0.012), Duck A stage (P=0.000), disease free interval from primary to metastases > 12 months (P=0.020) and largest hepatic tumor diameter < 5 cm (P=0.006) were independent protective factors for the prognosis of colorectal cancer patients with positive PD-L1 expression in liver metastases after surgical resection. Conclusion Personalized comprehensive treatment which is mainly consisted of surgical resection still has a good effect on colorectal cancer patients with positive PD-L1 expression in liver metastases after hepatectomy. Without dMMR, Duck A stage, disease free interval from primary to metastases > 12 months and largest hepatic tumor diameter ≤5cm are independent protective factors for patients' prognosis.

Background and purpose:18?-glycyrrhetinic acid(GA) is one of the important components of glycyrrhiza.Recent years,studies showed that GA has the effect of proliferation inhibition in human acute lymphoblastic leukemia cells,human liver carcinoma and lung cancer cells.We investigated the effects of GA on induction of apoptosis in human breast carcinoma(MCF7) cells.The previous studies have demonstrated that the dynamic change of intracellular free Ca~(2+) concentration([Ca~(2+)]i)plays important roles in many links of apoptosis-induced process.Therefore we also researched the relationship between GA-induced apoptosis and [Ca~(2+)]i in MCF-7 cells.Methods:After MCF-7 cells were treated with 50-250 ?mol/L GA for 24 h,cell viability for proliferation was assessed by MTT assay.MCF-7 cells treated with 100 ?mol/L and 150 ?mol/L GA for 24 h,the apoptotic rates in MCF7 cells were examined by terminal deoxynucleotide transferase mediated dUTP nick-end-labeling method,flow cytometry with Annexin V/ propidium iodide fluorescent stain and single cell gel electrophoresis assay(SCGE).For cells treated with 150 ?mol/L GA for 24 h,i was measured by Fure-2 fluorescein load method.For cells treated with 150 ?mol/L GA combined with 100 ?mol/L BAPTA-AM or 0.5 mmol/L EGTA for 24 h,cell apoptosis were examined by SCGE.Results:For cells treated with GA from 100 ?mol/L to 250 ?mol/L,the rate of proliferative inhibition was increased significantly(P

Objective Establishment of two experimental models for osteoclast differentiation from monocyte in vitro,and to study the potential of osteoclast differentiation induced by cytokines.Methods Direct model of osteoclast differentiation: CD14+ monocyte fraction of peripheral blood mononuclear cell(PBMC) stimulated by(25 ?g/L) M-CSF+(10~(-8)mol/L) LTB4 for two weeks.Indirect model of osteoclast differentiation: Utilize the coculture model of RAFLs and monocyte that were stimulated in the presence of 25 g/L M-CSF+(10~(-8)mol/L) LTB4 for three weeks.In TRAP staining the multinucleated TRAP staining positive osteoclast-like cells were counted as marker of as differentiation effect of each group.Results Osteoclast-like cells can be induced by both direct and indirect models.Conclusion Two experimental models for osteoclast differentiation can be separately used to study the effect of various cytokines for direct and indirect OC differentiation.

OBJECTIVE To seek for an effective,rapid,economic,safety and practical cleaning method,so as to ensure the high quality of sterilization in hospital supply center.METHODS Six hundred moderately contaminated recyclable instruments were divided into three groups randomly,conventional group,experimental group A and experimental group B(two hundred sorts each).The instruments in experimental group A were put into warmed water(40 ℃) for ten minutes first,and that in experimental group B were put into multi-enzyme solution for five minutes first,and then all the instruments in three groups were put into automatic sprinkling cleaning machine to accomplish the cleaning process automatically.After cleaning process,cleaning degree of the instruments and remained blood residues were compared in three groups.RESULTS The cleaning quality in the groups A and B was significantly higher than that of the conventional group,both P

Objective To investigate the expression of extracellular matrix metalloproteinase induced (EMMPRIN) in the synovial membrane of patients with rheumatoid arthritis (RA).Methods Immunohistochemistry were performed to characterize the EMMPRIN-expressing cells at sites of joint destruction derived from RA and osteoarthritis (OA) patients.Reverse trancription polymerase chain reaction (RT-PCR) was performed to study the existence of EMMPRIN in synovial membrane samples.And it was followed by computer assisted image analysis in order to detect the A values of their experession.Results EMMPRIN immunoreactivity was more intense in RA than in OA synovial membrane (P

AIM: To investigate the influences of native and oxidized lipoprotein(a) on human arterial smooth muscle cell (SMC) proliferation, change of intracellular free calcium concentration ([Ca 2+ ] i) and the protective effect of sodium ferulate(SF). METHODS: Lp(a) was oxidized by Cu 2+ and the extent of oxidation was assessed by the MDA content.Human SMC were incubated in culture media with SF for 12 h, then exposed to Lp(a) and oxidized-Lp(a), respectively. MTT colorimetry and flow cytometry were used to evaluated the proliferation of SMC and flurorescent indicator Fura-2/AM was used to determined [Ca 2+ ] i. RESULTS: ox-Lp(a) significantly promoted proliferation of SMC and increased[Ca 2+ ] i compared with Lp(a). SF(40,80 mg/L) remarkedly inhibited SMC proliferation and decreased the rising of [Ca 2+ ] i induced by ox-Lp(a) in a dose-dependent manner, but no effect on SMC proliferation and the increase in [Ca 2+ ] i induced by Lp(a).CONCLUSION: ox-Lp(a) induces the strong growth-promoting effect in SMC through increasing in [Ca 2+ ] i, which might be one of the cellular mechanisms responsible for the higher atherogenic potential of ox-Lp(a) compared with Lp(a), and this process can be prevented by inhibiting of oxidation by SF.

Objective:To investigate the roles and regulation mechanism of miR-31 in human cutaneous squamous cell carcino-ma (cSCC) growth. Methods:cSCC cells were transfected with the antisense oligonucleotide (ASO) of miR-31, and the cSCC growth was tested by colony formation and in vivo tumor formation assays. The target gene of miR-31 was validated by Western blot and green fluorescent protein (GFP) reporter assay. The cells were then transfected with the siRNA of the target gene, and the effect of the target gene on cell growth was preformed by colony formation assay. Finally, real-time PCR and immunohistochemistry were used for analy-sis of the expression of miR-31 and its target gene. Results:miR-31 ASO resulted in a low number of cell colonies and small tumor vol-ume (P<0.05). Western blot showed that the cells with miR-31 ASO had a higher protein level of large tumor suppressor homolog 2 (LATS2) than the control. The 3' UTR of LATS2 had a binding site with miR-31, and miR-31 ASO increased the GFP intensity con-trolled by LATS2 3' UTR, whereas no effect was observed on the mutant LATS2 3' UTR. Western blot showed that LATS2 siRNA inhib-ited the expression of LATS2 protein by about 80%. Knocking down of LATS2 increased the colony number by about 70%or 1.3-fold in cSCC cells. Real-time PCR showed that miR-31 was overexpressed in most cSCC tissues, compared with normal tissues. An inverse relationship existed between miR-31 and LATS2 expression levels. Immunohistochemistry validated that LATS2 was downregulated in cSCC tissues. Conclusion:miR-31, which functions as an oncogene, promotes cSCC growth by suppressing LATS2 expression. Our da-ta suggest that miR-31 is a potential miRNA-based therapeutic target for cSCC growth.