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#29028097   2017/10/13 Save this To Up

MicroRNA-217 functions as a prognosis predictor and inhibits pancreatic cancer cell proliferation and invasion via targeting E2F3.

Pancreatic cancer (PC) is the most malignant tumor among all the tumors in the digestive system. MiR-217 has been reported to take a critical part in various malignant tumors. The aim of this study was to explore the function of MiR-217 in pancreatic cancer and its target genes.

2085 related Products with: MicroRNA-217 functions as a prognosis predictor and inhibits pancreatic cancer cell proliferation and invasion via targeting E2F3.

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#28983470   2017/10/06 Save this To Up

The EspF N-Terminal of Enterohemorrhagic Escherichia coli O157:H7 EDL933w Imparts Stronger Toxicity Effects on HT-29 Cells than the C-Terminal.

Enterohemorrhagic Escherichia coli (EHEC) O157:H7 EspF is an important multifunctional protein that destroys the tight junctions of intestinal epithelial cells and promotes host cell apoptosis. However, its molecular mechanism remains elusive. We knocked out the espF sequence (747 bp, ΔespF), N-terminal sequence (219 bp, ΔespFN ), and C-terminal sequence (528 bp, ΔespFC ) separately using the pKD46-mediated λ Red homologous recombination system. Then, we built the corresponding complementation strains, namely, ΔespF/pespF, ΔespFN/pespFN , and ΔespFC/pespFC by overlap PCR, which were used in infecting HT-29 cells and BALB/C mice. The level of reactive oxygen species, cell apoptosis, mitochondrial trans-membrane potential, inflammatory factors, transepithelial electrical resistance (TER), and animal mortality were evaluated by DCFH-DA, double staining of Annexin V-FITC/PI, JC-1 staining, ELISA kit, and a mouse assay. The wild-type (WT), ΔespF, ΔespF/pespF, ΔespFC , ΔespFC/pespFC , ΔespFN , and ΔespFN/pespFN groups exhibited apoptotic rates of 68.3, 27.9, 64.9, 65.7, 73.4, 41.3, and 35.3% respectively, and mean TNF-α expression levels of 428 pg/mL, 342, 466, 446, 381, 383, and 374 pg/mL, respectively. In addition, the apoptotic rates and TNF-α levels of the WT, ΔespF/pespF, and ΔespFC were significantly higher than that of ΔespF, ΔespFN , ΔespFC/pespFC , and ΔespFN/pespFN group (p < 0.05). The N-terminal of EspF resulted in an increase in the number of apoptotic cells, TNF-α secretion, ROS generation, mitochondria apoptosis, and pathogenicity in BalB/c mice. In conclusion, the N-terminal domain of the Enterohemorrhagic E. coli O157:H7 EspF more strongly promotes apoptosis and inflammation than the C-terminal domain.

2596 related Products with: The EspF N-Terminal of Enterohemorrhagic Escherichia coli O157:H7 EDL933w Imparts Stronger Toxicity Effects on HT-29 Cells than the C-Terminal.

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#28954272   2017/09/27 Save this To Up

CXCR4/Let-7a Axis Regulates Metastasis and Chemoresistance of Pancreatic Cancer Cells Through Targeting HMGA2.

Pancreatic cancer cells (PCC) is one of the most risky cancers and gemcitabine (GEM) is the standard first-line drug for treating PCC. The PCC will develop drug resistance to GEM after a period of treatment. However, the detailed molecular mechanism of pathogenesis and drug resistance remains unresolved.

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#28945763   2017/09/25 Save this To Up

Toxicological effects of NCKU-21, a phenanthrene derivative, on cell growth and migration of A549 and CL1-5 human lung adenocarcinoma cells.

Chemotherapy insensitivity continues to pose significant challenges for treating non-small cell lung cancer (NSCLC). The purposes of this study were to investigate whether 3,6-dimethoxy-1,4,5,8-phenanthrenetetraone (NCKU-21) has potential activity to induce effective toxicological effects in different ethnic NSCLC cell lines, A549 and CL1-5 cells, and to examine its anticancer mechanisms.

1467 related Products with: Toxicological effects of NCKU-21, a phenanthrene derivative, on cell growth and migration of A549 and CL1-5 human lung adenocarcinoma cells.

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#28902344   2017/09/13 Save this To Up

Insulin-like growth factor-1 promotes the proliferation and odontoblastic differentiation of human dental pulp cells under high glucose conditions.

Insulin-like growth factor-1 (IGF-1) promotes human dental pulp stem cell proliferation and osteogenic differentiation. However, the effects of IGF-1 on the proliferation, apoptosis and odontoblastic differentiation (mineralization) of dental pulp cells (DPCs) under high glucose (GLU) conditions remain unclear. In this study, isolated primary human DPCs were treated with various concentrations of high GLU. Cell proliferation and apoptosis were determined by Cell Counting Kit-8 and Annexin V-FITC/PI assays, respectively. The cells were cultured in odontoblastic induction medium containing various concentrations of high GLU. Odontoblastic differentiation was determined by alkaline phosphatase (ALP) activity assay. Mineralization formation was evaluated by von Kossa staining. The expression levels of IGF family members were measured by western blot analysis and RT-qPCR during proliferation and differentiation. The cells were then exposed to 25 mM GLU and various concentrations of IGF-1. Cell proliferation, apoptosis, ALP activity, mineralization formation and the levels of mineralization-related proteins were then evaluated. Our results revealed that high GLU significantly inhibited cell proliferation and promoted cell apoptosis. GLU (25 and 50 mM) markedly reduced ALP activity and mineralization on days 7 and 14 after differentiation. The levels of IGF family members were markedly decreased by high GLU during proliferation and differentiation. However, IGF-1 significantly reversed the effects of high GLU on cell proliferation and apoptosis. Additionally, IGF-1 markedly restored the reduction of ALP activity and mineralization induced by high GLU. Our findings thus indicate that IGF-1 attenuates the high GLU-induced inhibition of DPC proliferation, differentiation and mineralization.

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#28901461   2017/09/13 Save this To Up

miR106b regulates retinoblastoma Y79 cells through Runx3.

MicroRNAs are increasingly recognized as important regulators of cancer. The aim of the present study was to investigate the role of miR-106b in the regulation of Y79 retinoblastoma. Y79 cells were transfected with antisense oligonucleotides (ASO) against miR-106b (ASO-miR-106b) or ASO-control. After transfection, the levels of miR-106b were monitored with real-time PCR (RT-PCR). The effects of ASO-miR-106b transfection on cell viability was evaluated by Cell Counting Kit-8 (CCK-8) analysis at 24, 48 and 72 h after transfection. Subsequently, the cells were stained with Annexin V-FITC and propidium iodide (PI) and subjected to flow cytometry to assess cell apoptosis. Transwell assay was used to analyze cell migration. Changes in Runt-related transcription factor 3 (Runx3) mRNA and proteins levels were also evaluated. miR-106b was downregulated by ASO-miR-106b at 48 and 72 h after transfection, accompanied by a decrease in cell viability and proliferation, as well as an increase in cell apoptosis. Transwell analysis indicated that cells treated with ASO-miR-106b exhibited significantly lower cell migratory abilities. The mRNA and protein level of Runx3 were upregulated after transfection. These results demonstrated that suppression of miR-106b inhibited Y79 cell proliferation and migration. The upregulation of Runx3 after miR-106b suppression ascertained that Runx3 is a tumor-suppressor in retinoblastoma and is a target of miR-106b.

1368 related Products with: miR106b regulates retinoblastoma Y79 cells through Runx3.

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#28882785   2017/09/08 Save this To Up

Orlistat treatment induces apoptosis and arrests cell cycle in HSC-3 oral cancer cells.

The present study was aimed to investigate the effect of orlistat on an oral squamous cancer line HSC-3 as well as the underlying mechanism. Cell Counting Kit-8 (CCK-8) (Dojindo, Shanghai, China) was used for the analysis of proliferation, Annexin V-FITC and propidium iodide staining for apoptosis and flow cytometry for cell cycle distribution. Western blot assay was used to determine the alteration in the expression of cyclin D1, B1, E and CDK1. The results revealed a concentration and time-dependent decrease in the proliferation of HSC-3 cells by orlistat. The viability of HSC-3 cells was reduced to 23.4 ± 2.5 and 15.7 ± 1.6% at 40 and 50 μM concentration of orlistat after 48 h. Treatment of HSC-3 cells with orlistat resulted induction of apoptosis significantly (p < 0.05). Orlistat treatment led to the increase in proportion of apoptotic cells to 38.6 ± 2.5% after 48 h compared to 0.85 ± 0.34% in the control. Analysis of cell cycle showed that population of cells in G2/M phase in the cultures treated with orlistat for 48 h increased to 59.7 ± 5% compared to 10.2 ± 1.2% in the control. However, the population of cells in the G0/G1 and S phases was subsequently decreased. The expression of cyclin D1 and E was decreased and phosphorylation of CDK1 was increased by orlistat treatment in HSC-3 cells. Thus, orlistat induces apoptosis and cell cycle arrest in G2/M phase in HSC-3 cells through decrease in expression of cyclin D1 and E and increase in phosphorylation of CDK1. Therefore, orlistat can be used for the treatment of oral squamous cancer.

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#28852730   2017/08/30 Save this To Up

DIFFERENT CONCENTRATIONS OF SIJUNZI DECOCTION INHIBIT PROLIFERATION AND INDUCE APOPTOSIS OF HUMAN GASTRIC CANCER SGC-7901 SIDE POPULATION.

Sijunzi Decoction (SD) is a traditional Chinese medicine which is composed of Ginseng, Atractylodes, Poria and Licorice. It is one of the commonly used Chinese traditional medicines that showed anti-gastric cancer activity in clinical studies. Previous evidence demonstrated SD parties (Ginseng, Atractylodes, Poria, Licorice) can inhibit proliferation and induced apoptosis for gastric cancer cell. In order to further investigate the anticancer effect of SD in gastric cancer, we observed the effects of different concentrations of SD on proliferation and apoptosis of Side Population Cells (SP) of human gastric cancer SGC-7901.

1735 related Products with: DIFFERENT CONCENTRATIONS OF SIJUNZI DECOCTION INHIBIT PROLIFERATION AND INDUCE APOPTOSIS OF HUMAN GASTRIC CANCER SGC-7901 SIDE POPULATION.

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#28843827   2017/08/27 Save this To Up

PTPN21 protects PC12 cell against oxygen-glucose deprivation by activating cdk5 through ERK1/2 signaling pathway.

PTPN21, a cytosolic non-receptor tyrosine phosphatase isolated from human skeletal muscle, was reported to promote neuronal survival. Nevertheless, it is not clear whether PTPN21 plays a role in hypoxia ischemia-induced neuronal injury. A proper understanding of the PTPN21 mechanism in neuron growth regulation is limited. In this study, we investigated the neuroprotective effects and potential mechanism of PTPN21 on oxygen glucose deprivation (OGD)-injured PC12 cells. The ischemic stroke model of PC12 cells was made by OGD for 2h, after transfection of the PTPN21 siRNA and pcDNA 3.1 PTPN21(+). Cell viability was tested using the MTT and CCK-8 assay. Apoptotic cells were estimated by Annexin V-FITC/PI staining and caspase-3 activity using the Caspase-3 Assay Kit; the PTPN21, cdk5, ERK1/2 and p-ERK1/2 levels were estimated by qRT-PCR and Western blot. We found that the PTPN21 markedly increased cell viability, inhibited apoptosis. We also found that PTPN21 inhibited caspase-3 activity and down-regulating the Bax/Bcl-2 ratio. Furthermore, the expression of cdk5 protein was up-regulated by PTPN21 by activating ERK1/2 signaling pathway. Finally, our results showed that cdk5 siRNA or ERK1/2 signaling inhibitor PD98059 attenuated the accelerative effect of pcDNA3.1 PTPN21(+) on cell proliferation and apoptosis in PC12 cells. In short, it appears that PTPN21 may protect the PC12 from ischemia injury by upregulating cdk5 via ERK1/2 signaling pathway.

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#28822194   2017/08/19 Save this To Up

[Effect of oridonin on apoptosis and intracellular reactive oxygen species level in triple-negative breast cancer MDA-MB-231 cells].

Oridonin, which is an ent-kaurene diterpenoid isolated from traditional Chinese medicine Rabdosia rubescens, displays various bioactivities, including anti-inflammation, anti-bacteria and anti-tumor. This study aimed to investigate the effect of oridonin on apoptosis of triple-negative breast cancer MDA-MB-231 cells and its underlying mechanisms. The inhibitory effect of oridonin on proliferation of MDA-MB-231 cells was measured by MTT assay; Apoptosis was analyzed by flow cytometry with PI staining and Annexin V-FITC/PI staining; Intracellular reactive oxygen species (ROS) level was determined by ROS detection kit, and expressions of PARP, Bcl-2, caspase-3 were analyzed by Western blot. The results showed that oridonin exhibited a significant effect in inducing apoptosis of MDA-MB-231 cells, enhancing intracellular ROS level, down-regulating expression of Bcl-2 protein, and promoting cleavage of caspase-3 and its substrate PARP. These results indicated that the apoptosis-inducing effect of oridonin on MDA-MB-231 cells might be correlated with increase of intracellular ROS level, down-regulation of Bcl-2 protein and activation of caspase-3.

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