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Objective:To investigate the expression changes of lncRNAs and mRNAs in human umbilical vein endothelial cells(HUVEC) treated by tritiated water.Methods:HUVEC cells were divided into two groups, the control group cultured in DMEM medium, and the tritiated water exposure group cultured in a medium containing tritiated water with a final concentraion of 3.7×10 3 Bq/ml. After culture for 48 h, cells were collected for RNA extract.The differentially expressed lncRNAs and mRNAs were screened by high-through put chip technology and then analyzed. Results:Compared with the control group, 1 717 lncRNAs were significantly up-regulated and 3 994 lncRNAs significantly down-regulated, and 4 562 mRNAs were significantly up-regulated and 1 433 mRNAs down-regulated. Through co-expression analysis of differential mRNAs and lncRNAs, some key genes including SQSTM1, CXCL8, ITPR1, GADD45A, NF-kB1 and VDAC1 were obtained.Conclusions:Tritiated water exposure can induce multiple changes of mRNAs and lncRNAs in vascular endothelial cells, which may lead to toxic effects through signaling pathways including some key genes such as SQSTM1, CXCL8, and ITPR1.
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Objective To establish a stem cell life-cycle management information system to realize collection,storage,inquiry,processing and statistical analysis of the stem cell and to provide information for the research on stem cell translation medicine.Methods The functional modules of the system were determined based on the analyses on the requirements of stem cell bank management and its operational flow.The system design was explored from the aspects of technical framework,safety control and fuzzy query.Results The system was gifted with a technical architecture and anallocation scheme based on Spring MVC mode,which proved its efficiency by the trial.Conclusion Stem cell resource library can be used as an important supplement to the clinical sample life-group database,providing data and technical basis support for large-scale clinical samples to transform,integrate,manage and share large data resources.
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Regarding radioactive iodine-refractory failure or advanced differentiated thyroid cancer,multiple multikinase inhibitors including sorafenib and lenvatinib,which target platelet derived growth factor receptor,vascular endothelial growth factor pathway,and rearranged during transfection (RET) pathway were proved to have obvious antitumor activity.Moreover,selective BRAF inhibitor,promoting drug uptake of radioactive iodine also showed a certain therapeutic effect.These molecular targets which are relevant with differentiated thyroid cancer occurrence,development,invasion and metastasis have become of its moment,and,selective inhibitors and re-differentiation agents were shown to be promising.In the future,individual genetic testing would provide more specific information in directing individualized molecular-targeted therapy.
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miRNA is a kind of small,endogenous noncoding RNA which regulates gene expression in post-transcription level and is highly conserved and tissue-specificity,miRNA generally participates the regulation of many complicated vital process,such as cell growth,development and also plays an important role in the pathogenesis of many kinds of tumors,miR-34b is a newly discovered miRNA,which is regulated by p53,promoter methylation and so on.miR-34b can regulate cellular proliferation and apoptosis,and also involves in the generation and regulation of tumor,which suggests wide application prospect in therapy and prognosis of tumor.This review will focus on the progress of miR-34b and its relationship with tumor.
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Objective To investigate the effect of ionizing radiation on the expression of transcription factor STAT3 target genes in the pulmonary adenocarcinoma cell line A549.Methods The expressions of VEGF,Bcl-2 and Survivin in A549 cells with or without STAT3 inhibition were detected by RT-PCR and/or Western blot 24 h after 2 or 4 Gy of γ-ray irradiation.Results After γ-ray irradiation with 2 or 4 Gy,the expression of VEGF and Survivin increased significantly.However,the expression of Bcl-2 was not affected by γ-ray irradiation.Furthermore,the increased expression of VEGF and Survivin induced by radiation was found to be inhibited after radiation-induced activation of STAT3 was blocked by AG490 inhibiter.Conclusions γ-ray irradiation could up-regulate the expression of Survivin and VEGF via activating STAT3.The increase of Survivin might partly inhibit the radiation-induced apoptosis of A549 cells,and the up-regulation of VEGF might contribute to the tumor angiogenesis.
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Objective To investigate the effect of whole-body irradiation with low-dose γ-rays on the central nervous system of mice.Methods Fifty C57 mice were randomly divided into 3 groups and treated with 0,0.5,1 Gy whole-body irradiation,respectively.24 or 48 h after irradiation,brain tissue of mice was resected and homogenated.The levels of amino acid neurotransmitter,including Glu,Asp,GABA and Gly in brain homogenate were measured by high performance liquid chromatography (HPLC).Results Compared to the brain tissue of untreated mice,the contents of Glu and Asp at 0.5 and 1 Gy (t=-4.080,-3.935,-4.416,-3.630,-4.831, - 4.656,P ＜0.05) in mice brain tissue significantly increased at 24 h at 1 Gy and 48 h.However,the contents of Glu and Asp had no obvious changes in mice brain tissue 24 h after 1 Gy of irradiation. The contents of GABA and Gly had no difference between irradiated groups and untreated control group. Conclusions Short-term whole-body irradiation with low-dose γ-rays induces slight stimulation effect on the central nervous system of mice.
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ObjectiveTo study the dose and time effects of X-ray radiation on the expression of Pokemon gene and protein in human lung adenocarcinoma cell line A549.MethodsA549 cells was exposed to different doses of X-ray (2,4,6 and 8 Gy),and the expression of Pokemon mRNA and protein of the cells was detected by using Quantitative real-time PCR and western-blotting at 2,4,8,12,24,and 48 h after irradiation. 3-( 4,5-Dimethylthiazol-2-yl )-2,5-diphenyltetrazoliumbromidewasused to detectthe proliferation of A549 cells at 1,2,3,4,and 5 d after 2 Gy X-ray irradiation.The mock treated A549 cells were used as the control.ResultsThe expression of Pokemon mRNA trended to decrease after irradiated with 4,6 and 8 Gy in the earlier period and increased in the later period with statistical difference at the most time points (t =3.40 -154.76,P =0.000 -0.041 ).The expression of Pokemon protein trended to increase and reached the peak at 8 h after irradiated of 2,4,6 and 8 Gy with statistical difference at the most time points ( t =4.18 - 89.64,P =0.000 - 0.039).Compared with the control,the proliferation of A549 cells was significantly inhibited during 3 to 5 d after irradiation of 2 Gy ( t =2.34 - 18.19,P =0.000 -0.040).ConclusionsX-ray irradiation may increase the expression of Pokemon mRNA and protein in A549 cells,which might be correlated with radiation-resistance of A549 cells.
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Objective To explore the effects of low dose X-ray irradiation on the ability of antigen presentation and IL-12 secretion in human dendritic cells that had been cultured for different time in vitro.Methods The human peripheral blood mononuclear cells ( PBMC ) were collected and differentiated to dendritic cells (DCs) by rhGM-CSF and rhIL-4 treatment in vitro.The DCs were divided into 3 groups,group A:DCs were cultured for 2 d and then irradiated with 0.05,0.1,0.2 and 0.5 Gy X-rays; group B:DCs were cultured for 6 d and then irradiated as above; group C:DCs were cultured without irradiation.At 8 d of cell culture,the DCs were applied to activate T cells and CCK-8 was used to detect MLR ( mixed lymphocyte reaction),and the antigen presentation ability of DCs was evaluated.MTT assay was also used to test the cell-killing effect of the activated T-cells on A549 cells.IL-12 in the culture medium of DCs was detected by ELISA.Results After irradiation with 0.2 and 0.5 Gy X-rays,the antigen presentation ability of DCs was decreased in group A (t =2.79 and 3.71,P ＜ 0.05 ),but significantly increased in group B (t =3.60 and 3.11,P ＜ 0.05).The ability of the T cell activation was detected and the proliferation of A549 cells was slightly inhibited by the DCs in group A (t =2.89 and 2.91,P ＜ 0.05),but was obviously inhibited by the DCs in group B (t =2.91 and 2.82,P ＜0.05).Meanwhile,the level of IL-12 was dramatically decreased in group A (t =4.44 and 6.93,P ＜ 0.05),but was increased in group B (t =3.51 and 4.12,P ＜0.05).Conclusions The abilities of antigen presentation and proliferation inhibition of DCs could be down-regulated by low dose( ＜ 0.5 Gy) of X-ray irradiation at the early stage of DCs,but was up-regulated at the late stage of DCs culture.
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Objective To study the effects of X-ray radiation on CC-chemokine receptor 7(CCR7) expression in human non-small cell lung cancer (NSCLC) cells.Methods Humanadenocarcinoma cells of the line A549 were cultured and irradiated by X-ray at the absorbed doses of 2,4,6,and 8 Gy respectively by linear accelerator (with the source skin distance of 100 cm and dose rate of 442.89 cGy/min).The relative levels of CCR7 mRNA and protein expression in the A549 cells were respectively detected by real time-PCR and Western blotting 4,12,24,48,and 72 h after radiation.Untreated A549 cells were used as control group.Results The expression levels of CCR7 mRNA and protein in the A549 cells began to increase since 4 h after radiation and then decreased gradually after they reached the peak.The CCR7 mRNA expression levels 72 h after radiation of the 6 and 8 Gy groups were still significantly higher than those of the control group (t = 6.75-7.26,both P < 0.01),and the CCR7 protein expression levels of the 2 and 6 Gy group were still significantly higher than those of the control group(t=11.13-14.17,both P <0.01).Then the CCR7 protein expression levels of the 4 and 8 Gy groups decreased to the control group level 48 and 72 h after radiation respectively.Conclusions The CCR7 mRNA and protein expression levels in the NSCLC cells increase after X-ray irradiation,which may be correlated with the promotion of proliferation and metastasis of NSCLC cells by X-ray irradiation at a certain dose.
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Objective To investigate the effects of signal transducer and activator of transcription 3 (STAT3) RNAi on the content of reactive oxygen species (ROS) and the DNA damage in glioma cells.Methods Glioma cells of the line U251 cells were cultured and transfected with STAT3 RNAi plasmid (pSilencer2.1-STAT3,STAT3 group) and pSilencer2.1-GFP (GFP control group) respectively.Part of the U251 cells were irradiated with γ-rays of 60Co as positive control group of smear phenomenon.The levels of ROS and malondialdehyde (MDA) in the cells were detected 24,48,and 72 h later by flow cytometry and fluorescence chamoluminescence analyzer,respectively.The DNA damage in the transfected U251 cells was examined by using single cell gel electrophoresis assay,and the cell cycle distribution was examined using FACS PI staining 12,24,and 36 h later.Results At 24 h after the transfection,the ROS level of the siSTAT3-transfected ceils was 8.91 times that of the control group (F = 89.296,P < 0.05),and returned to the normal level 48 h later.There were not significant differences in the MDA level of the cells 24,48,and 72 h later between the siSTAT3 group and siGFP group.Compared with the 8 Gy irradiation positive group with obvious smear phenomenon,smear phenomenon was shown in part of the ceils in the siSTAT3 group 6 h later,became less 12 h later,and disappeared completely 24 h later.Compared with the control group,lag of S stage rate was 17.22% and the lag of G2/M stage rate was 6.4% 12 h later in the siSTAT-transfected group,and the G0/G1 stage lag rate was 18.44% 24 h later,and the lag of S stage rate was 17.99% 36 h later.Conclusions Inhibition of STAT3 results in the change of oxidoreduction status in glioma cells,as well as damage and reparation of DNA.
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Objective To investigate the effect of ionizing radiation on the invasion of the pulmonary adenocarcinoma cell line A549.Methods The invasiveness of A549 cells irradiated with 2 and 4 Gy doses of γ-rays was detected by using transwell invasion assay.The expression levels of matrix metalloproteinase (MMP)-2 mRNA and protein and phosphorylated signal transducers and activators of transcription 3 ( STAT3 ) protein were detected by reverse transcription PCR and Western blot.Results After irradiation with 2 or 4 Gy, the invasiveness of A549 cells increased by 200.0% ( F = 111.7, P ＜ 0.01 ) and 390.9% ( F = 593.7, P ＜ 0.01 ), respectively, compared with that in untreated A549 cells.Furthermore, the transcription and protein expression of MMP-2 24 h after irradiation and the phosphorylation of STAT3 12 h after irradiation were promoted.The irradiation-induced elevation of MMP-2 protein expression was suppressed using STAT3 phosphorylation specific inhibitor (AG490).Moreover,compared with 4 Gy of irradiation alone, treatment with 4 Gy of irradiation plus AG490 decreased the number of invasive cells by 76.1% ( F = 555.9, P ＜ 0.01 ), and the number of invasive cells in 4 Gy of irradiation plus AG490 group made up only 117.8% of that in untreated group ( F = 3.6, P ＞ 0.05 ).Conclusions Ionizing radiation could activate STAT3, which triggers the transcription of MMP-2, and then promote the invasiveness of A549 cells.
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Objective To investigate the protective effects of FUZHENGJIEDU,a kind of Chinese herb on rats exposed to radon and it's daughter.Methods Twelve male SD rats were exposed with concentration of 40 000 Bq/m3 radon and the exposed dose was 120 work level month (120 WLM),and then all the rats were randomly divided into 2 groups.One group was 120 WLM group (positive control,n=6 ),the other group was FUZHENGJIEDU treatment group (120 WLM exposed rats were given FUZHENGJIEDU 5.0 g every day,n =6),meanwhile 6 rats which lived in the normal environment ( the concentration of radon and it's daughter was lower than 50 Bq/m3 ) as control group.The levels of tumor markers induding carcinoembryonic antigen ( CEA),neuron-specific enolase (NSE),CYFRA21-1 and p53 antibody were tested by ELISA.The rate of p16 gene methylation was measured by methylation-specific PCR (MSP).Results The levels of CEA and NSE in 120 WLM group were (396.62 ± 148.74) and (9.09 ±0.90) μg/L,respectively,significantly higher than those of control group (t =2.583,2.463,P ＜ 0.05).The levels of CEA and NSE in treatment group were (70.89 ±44.71) and (4.31 ±1.37) μg/L,respectively,remarkably lower than those of 120 WLM group (t =2.921,2.526,P ＜0.05 ).The concentrations of CYFRA21-1 and p53 antibody were not significantly different among the three groups (t =1.713,1.963,P ＞ 0.05 ).The rate of p16 gene methylation in BALF cells in 120 WLM group was 16.67％,but in control group and treatment group did not arise p16 gene methylation in BALF cells.Conclusions FUZHENGJIDU would decrease the levels of CEA and NSE and the rate of p16 gene methylation,and could exert it's protective effect on rats exposed to high concentration of radon.
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[Objective]To discuss a reasonable treatment for unstable intertrochanteric hip fractures in senile patients by comparing the effects of PFN fixation and hemiarthroplasty.[Method]Totally 82 intertrochanteric hip fractures in senile patients with complete clinical data were retrospectively analyzed,who were treated with hemiarthroplasty or PFN fixation from April 2005 to April 2007.Forty-six were treated with hemiarthroplasty,36 were treated with PFN fixation.All of them had multiple medical co-morbidities.According to modified Evens-Jensen classification,all of them belonged to unstable fracture.Comparison was made between the two treated groups in terms of the length of incision,operative time,the blood lost,blood transfusion during or after surgery,time for bed rest postoperatively,postoperative complications and St.Michael hip score one year after surgery.[Result]The average duration of follow-up for PFN fixation and hemiarthroplasty were 16 and 18 months respectively.Compared with the group of hemiarthroplasty,the group of PFN fixation experienced longer operation time,longer time for bed rest postoperatively,less blood lost,less blood transfusion during or after surgery,shorter incision length,and the differences between two groups had statistical significance (P0.05).[Conclusion]Both of the two methods are reasonable treatment for unstable intertrochanteric hip fractures in senile patients.
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Fluorogenic quantitative polymerase chain reaction(FQ-PCR) is an emerging technique with high specificity,susceptibility,automatism and has been widely used for the detection and quantification of microorganism,some genetic diseases and cancer.The design and establishment of standard FQ-PCR laboratory are required not only by gene expansion and diagnosis but also by biosafty and veracity.The aim of the paper is to introduce the structural characteristics,instruments requirement and comfort parameters of FQ-PCR laboratory.
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Objective To discuss the establishment of emergency management information system in area nucleus and radiation. Methods Starting with the challenge in the nucleus and radiation work, according to the demand of the whole frame of the nucleus and radiation emergency management system and combining with the characteristic of nucleus and radiation emergency, the author devised the whole frame of the nucleus and radiation emergency management system, and designed the databank and operation application system based on nucleus and radiation emergency management system. Results The author designed the emergency management information system facing area nucleus and radiation, which can provide technique support for the nucleus and radiation, such as forecast and early -warning, monitor and control, emergency command, assistant decision and so on. Conclusion Nucleus and radiation emergency is the important part of the country emergency management system. It is an important promise for the persistence development of the nucleus enterprise to build a safe and perfect nucleus and radiation emergency management system. It is also the key question to the country safety and social stability.
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Medical emergency response is a part of emergency response to nuclear accident,and the equipment and technology play an important role in the process.So it's important and necessary to research the equipment and technology requirements of medical emergency response to nuclear and radiation accident.The aim of the paper is to screen and list some basic equipments and technology in medical emergency response to nuclear and radiation accident,such as individual internal and external exposure dose monitor,radiation detection appliance,decontamination and radiation protection equipment as well as first-aid instrument.