Objective:To investigate the effect of dexamethasone on the growth and the mechanism of apoptosis in K562 cells.Methods:Treat of different dosages of dexamethasone in K562 cell cultural to observe cell inhibitory rate and cell morphology variation.To detected telomerase activity,Fas expression and NO release.Results:Dexamethasone can inhibit the proliferation of K562 cell,decrease telomerase activity,increase Fas expression and induce apoptosis.But no significant effect on nitric oxide production.Conclusion:Inhibit telomerase activity and increase Fas expression maybe one of mechanism of apoptosis.

Human cytomegalovirus(HCMV) is a ubiquitous herpesvirus.It is always a serious pathogen in immunosuppressed individuals,and also the most common and harmful agent causing congenital infection and birth defects.Biological functions of the encoded proteins in HCMV UL/b' region,which is deleted in the HCMV laboratory AD169 strain,have been explored in depth in recent years,and the results demonstrate that the proteins have important roles in HCMV virulence,transmission,tropisms and immune escape and so on.UL133-UL138 locus can promote to establish and maintain HCMV latent infections,and pUL1 38 is the first HCMV protein demonstrated to promote infection with the hallmarks of latency in CD34 + hematopoietic progenitor cells (HPC).Therefore,the products expressed by the gene of HCMV UL/b' region are crucial in the course of HCMV infection.This article reviews the genetic structure and biological functions of encoded proteins in HCMV UL/b' region,especially pULl38 which is related with HCMV latent infections.It will be greatly significant to clarify the pathogenesis of HCMV infection.

Objective To investigate the effect of a multi-target protein tyrosine kinase inhibitor,Ponatinib,on proliferation,homogeneity adhesion and migration ability of human liver cancer cell line SK-Hep-1.Methods SK-Hep-1 cells were cultured routinely and added with 24 tyrosine kinase inhibitors such as Ponatinib respectively,and the effect of Ponatinib on the survival and proliferation of SK-Hep-1 cells was detected by MTT assay.SK-Hep-1 cells were cultured routinely until the fusion degree reached 90%,then added with 0.1,0.5 and 1.0 μmol/L Ponatinib respectively,and the control group(without Ponatinib) was set up.The effect of Ponatinib on adhesion ability of SK-Hep-1 cells was detected by cell slow aggregation assay and dissociation assay,while the effect on migration ability by scratch test,and the effect on E-cadherin protein expression in SK-Hep-1 cells by Western blot.Results All 24 tyrosine kinase inhibitors inhibited SK-Hep-1 cells,among which Ponatinib showed the strongest inhibitory effect with a IC_(50) of(0.288±0.044) μmol/L.Compared with the control group,the number of cell mass(t=16.143,44.002 and 44.853 respectively,each P <0.001) and N_(TC)/N_(TE) [ratio of single cell number(N) after digestion by trypsin containing EDTA(TE) and CaCl_2(TC)](t=4.276,10.625 and 27.571 respectively,each P <0.05) decreased significantly and E-cadherin protein expression increased significantly(t=-3.757,-4.561and-6.922 respectively,each P <0.05) in 0.1,0.5 and 1.0 μmol/L Ponatinib groups;Scratch migration rate significantly decreased in 0.5 and 1.0 μmol/L Ponatinib groups(t=6.272～16.733 respectively,each P <0.01),while there was no significant difference in 0.1 μmol/L Ponatinib group(t=0.473 and 0.872 respectively,each P> 0.05) after 24 h and 48 h of scratch.Conclusion Ponatinib inhibited proliferation and migration of SK-Hep-1 cells and promoted cell adhesion.

Objective To evaluate the effect of tyrosine kinase inhibitor BGJ398 on the proliferation,apoptosis and migration of human hepatocellular cancer Huh-7 cells and explore the mechanism.Methods The effects of 10 tyrosine kinase inhibitors on the survival of Huh-7 cells were detected by MTT assay,and the sensitivity of Huh-7 cells to BGJ398 was analyzed by single-target kinetic equation and biphasic kinetic equation respectively.Huh-7 cells were added with 10,30 and 90 nmol/L BGJ398 respectively,and the control group(without drugs)was set.The effects of BGJ398 on the apoptosis and cell cycle of Huh-7 cells were detected by flow cytometry after culturing at 37℃for 24 h,the effect on the migration ability was detected by wound healing assay and the effect on the expression of multiple pathway-related proteins was detected by Western blot.Results All of 10 tyrosine kinase inhibitors inhibited the proliferation of Huh-7 cells,among which Huh-7 cells were most sensitive to BGJ398 and the IC_(50)was(0.020±0.013)μmol/L;The response of Huh-7 cells to BGJ398 was composed of two phases with F_1 accounted for 92.8%(K_(d1)was 36 nmol/L)and F_2 accounted for 7.2%(K_(d2)>1 000μmol/L).Compared with the control group,the apoptosis rate and the percentage of Huh-7 cells in G1 phase increased significantly in 30 and 90 nmol/L BGJ398 groups(t=-6.407～-4.459,each P<0.05),while the percentage of Huh-7 cells in S phase decreased significantly in 10,30 and 90 nmol/L BGJ398 groups(t=2.982,7.859 and 12.425,respectively,each P<0.05);After 24 and 48 h of scratching,the scratch area of 30 and 90 nmol/L BGJ398groups decreased significantly(t=5.376～18.197,each P<0.05);The expression levels of phosphorylated fibroblast growth factor receptor(FGFR)and phosphorylated extracellular signal-regulated kinase 1/2(Erk1/2)protein decreased significantly in 30 and 90 nmol/L BGJ398 groups(t=4.015～6.729,each P<0.01).Conclusion BGJ398 can inhibit the proliferation and migration of human hepatocellular cancer Huh-7 cells,induce apoptosis and cell cycle arrest,which might be achieved by inhibiting FGFR phosphorylation and MAPK signaling pathway.BGJ398 is expected to be a potential agent for the treatment of hepatocellular cancer.

As an essential trace element for human,Zn is involved in the synthesis of various enzymes,and plays important roles in the growth and proliferation of cells.At the cellular level,Zn2+ homeostasis is maintained through the complex mechanisms of uptake,storage and excretion,where the Zn transporter families play certain roles.Two major Zn transporter families,namely the SLC30 (ZnT) family and the SLC39 (ZIP) family,have been identified,which act to control the intra-and extracellular equilibrium of Zn2+.While the ZnT family mainly transports Zn out of the cells,while the ZIP family mainly contributes to the uptake and transport of Zn into the cells.The ZIP family has been noted to be associated with various diseases,and be closely related to the development and progression of tumors.Recent studies have suggested low ZIP1 and ZIP2 expression in prostate cancer,high ZIP6,ZIP7 and ZIP10 expression in breast cancer,high ZIP3 and ZIP4 expression in pancreatic cancer,and high ZIP5 and ZIP6 expression in esophageal cancer.The ZIP family may,therefore,function as tumor suppressor genes in prostate cancer,and oncogenes in pancreatic cancer,breast cancer and esophageal cancer.This paper reviews the latest research progress on SLC39 transporter family and tumors.

Problem oriented system teaching method has been put into practice,and contrast has been made with traditional teaching method in the teaching of diagnostics in the technical secondary school of Chinese and western medicine special field.Result indicates that the improved teaching effect has been obtained and the students'initiatives and their ability to learn independently have been cultivated.

Construction Materials ; Dust ; prevention & control ; Occupational Exposure ; prevention & control ; Ventilation ; instrumentation ; Workplace

Female ; Humans ; Leiomyomatosis ; diagnosis ; surgery ; Uterine Neoplasms ; diagnosis ; surgery ; Vascular Neoplasms ; diagnosis ; surgery ; Vascular Surgical Procedures ; methods ; Veins

In recent years, there has been a growing emphasis on use of human adipose-derived stem cells (hADSCs) for cartilage tissue engineering owing to their ability to differentiate into chondrocytes, which is mainly induced by growth factors (GFs). In general, GFs for chondrogenic induction come from the transforming growth factor beta (TGF-beta) superfamily. To date, the most commonly used GFs for chondrogenes is TGF-beta1/3. However, the response of hADSCs to GFs may differ significantly from that of human bone marrow stem cells (hBMSCs). It has been reported that bone morphogenetic protein-6 (BMP-6) treatment induced TGF-beta receptor-I expression of hADSCs. It seems that these two cell populations varied strongly in their potency to undergo chondrogenesis in the same medium conditions. Here, we provide a concise review on various GFs used in chondrogenic differentiation of hADSCs in vitro.
Adipocytes ; cytology ; Cartilage ; Cell Differentiation ; Chondrocytes ; cytology ; Chondrogenesis ; Humans ; Stem Cells ; cytology ; TGF-beta Superfamily Proteins ; Tissue Engineering

Objective　To establish the normal growth velocity of fetal liver length and compare them with those of intrauterine growth retardation, pregnant diabetes and maternal-fetal blood types imcopatible. Method　Three hundred and five normal pregnant women and 24, 10, 16 pathological pregnant women of intrauterine growth retardation (IUGR), gestational diabetes and maternal-fetal blood types incompatible respectively had ultrasonographic measurement of fetal liver length at 18 to 42 weeks′ gestation. Results　Normal fetal liver length has a linear relation to gestational age, and showed a significantly rapid increase after 28th week with a growth rate of 1.76 mm per week, and 1.00 mm per week before 28th week (P<0.05). The growth rate of IUGR group before and after therapy were 1.19 mm and 1.23 mm per week, significantly lower than those of normal group (P<0.05). The growth rate of pregnant diabetes group before and after therapy were 1.63 mm and 1.63 mm per week, no statistical significance with normal group (P>0.05). The growth rate of maternal-fetal blood types incompatible group before therapy was 1.98 mm, showed no difference with normal group (P>0.05), but after therapy, the growth rate of fetal liver was 1.38 mm per week, significantly lower than normal group (P<0.05). Conclusion　Dynamic measurement of fetal liver length can help us to understand whether the fetus grow well in uterus and whether the treatments are effective.