Expression of ErbB3 in osteosarcoma cell lines Saos-2 and its significance / 国际肿瘤学杂志

Objective To explore the expression of ErbB3 in osteosarcoma cell lines Saos-2 and its significance.Methods Real-time quantitative PCR was used to detected ErbB3 mRNA expression in osteosarcoma cell lines Saos-2 and normal human osteoblasts cell lines N704,and Western blotting was used to detected ErbB3 protein expression.Short hairpin RNA was used to construct ErbB3 knockdown cells and the cell count in 0-3 d was detected.The 48 h survival rates of ErbB3 knockdown cells and normal Saos-2 cells were detected in the presence of 0-100 μmol/L paclitaxel.Results Real-time quantitative PCR showed significant enhanced ErbB3 mRNA expression in Saos-2 cells compared with N704 [(4.15 ± 0.04) times,t =7.31,P ＜0.05],and Western blotting showed significant enhanced ErbB3 expression in Saos-2 cells compared with N704.As compared with normal Saos-2 cells,ErbB3 knockdown could reduce the Saos-2 cells proliferation,at the first three days in culture,the Saos-2 cell number of ErbB3 silent was (22.2 ± 2.9) thousand,and the control was (45.8 ± 4.1) thousand,with statistical significance (t =8.23,P ＜ 0.05).Moreover,ErbB3 knockdown could reduce the Saos-2 cells tolerance to paclitaxel,when treated with 20 μmol/L paclitaxel,surviving cells in ErbB3 silent group was (43.2 ± 4.7) ％,and the control was (61.4 ± 5.9) ％,with statistical significance (t =6.74,P ＜ 0.05).Conclusion ErbB3 highly expresses in Saos-2 cells,ErbB3 expression can enhance the proliferation of Saos-2 cells and the tolerance of Saos-2 cells to paclitaxel.

The relation between endothelium-dependent vasodilator function and platelet L-arginine/nitric oxide pathway in patients with percutaneous coronary intervention / 重庆医学

Objective To investigate alteration and cross link of the vascular endothelium dependent diastolic function (FMD) and platelet endogenous L-arginine/NOS/NO pathway before and after percutaneous coronary intervention (PCI) .Methods The study included two groups :normal control group(17 cases) and PCI group(20 cases) .FMD of brachial artery and NO production , NOS activity ,L-arginine transport in platelets were examined respectively before ,immediately ,24 h and 72 h after PCI and the rela-tionships between them would subsequently be analysed .Results The preoperative FMD ,content of NO2 - ,NOS activity and L-ar-ginine of PCI group significantly decreased than the normal control group (P0 .05) .The analysis showed the obvious positive correlation between FMD and content of NO2 - or NOS activity ,or L-arginine transport of platelet ,respectively(P<0 .01) .Conclusion The pathway of platelet L-arginine/NOS/NO was significantly positively correlated with FMD and the detection of platelet L-arginine/NOS/NO can reflect the changes of vascular endothelial function with PCI .

Ataxia-telangiectasia mutated gene and breast cancer susceptibility / 生物工程学报

Breast cancer is bound up with the environment. As a consequence of DNA damage induced by environmental carcinogens, a number of sophisticated sensing and transduction systems are initiated and the signal is conveyed simultaneously to multiple effectors. This process ultimately results in cancer. The protein kinase Ataxia-telangiectasia mutated (ATM) that encoded by ATM gene is the master regulator of DNA damage response. In this consecutive reaction, the protein kinase ATM responds to the DNA damage by phosphorylating a variety of downstream substrates, which plays an important role in the inhibition of the development of breast cancer. After ATM gene mutate, DNA damaged could not be accurately repaired and finally accelerates breast cancer transformation and proliferation. With the further research of ATM gene structure, function and breast cancer susceptibility, the extensive attention is paid to the relationship between ATM gene and breast cancer susceptibility. We reviewed the research advances in breast cancer susceptibility in several aspects of ATM gene, including mutation, polymorphism and methylation.

DNA-PKcs silencing inhibit the DNA repair induced by low dose radiation on human breast epithelial cells / 生物工程学报

DNA-PKcs, the catalytic subunit of DNA-dependent protein kinase (DNA-PK), plays an important role in the nonhomologous end-joining (NHEJ) pathway of DNA double-strand breaks (DSBs) repair. To investigate the effects of DNA-PKcs down-regulation on cell growth and sensitization to low dose radiation (LDR), we transfected DNA-PKcs siRNA into human mammary epithelia cells MCF10F, then, detected the proliferation curve of the cells and the expression of protiens in DNA repair pathways. The results showed that DNA-PKcs gene silencing, induced by the transfection of DNA-PKcs siRNA could suppress significantly the cell proliferation and inhibit the expression of the DNA repair proteins, such as Ku80, ATM and P53 after 50 cGy 137Cs gamma-irradiation.The results suggested that DNA-PKcs gene silencing could increase the sensitivity of human breast epithelial cells to the LDR, which might be relative with the decrease of the proteins.

Effect of water-immersion restraint stress on nitric oxide production pathway in rat platelets / 基础医学与临床

Objective To investigate the effect of water-immersion restraint stress(WRS) on nitric oxide(NO) production and its mechanism in rat platelets.Methods Male SD rats underwent WIR stress for 2,4 and 8 hours.Ulcer index(UI) of stomach was chedsed by Guth method,nitrite production was measured by Greiss assay,nitric oxide synthase(NOS) activities and L-arginine transport rate were determined by isotope tracer method.ResultsAfter 2 h WRS,the NO production,the NOS activity and L-arginine transport rate in rat platelets obviously increased and then gradually decreased.After 8 h of WRS,these parameters were decreased as compared with the control group.The gastric ulcer appeared and got more serious after 4 h WIR stress.Conclusion Short-term WRS up-regulates L-arginine /NO pathway and increases nitric oxide production in the platelets but long-term WIR stress has the reversed effect.

Restraint stress down-regulates L-Arg/NOS/NO pathway of platelet and aortic intima in rats / 北京大学学报(医学版)

Objective: To investigate alteration and cross link of the aortic intima and platelet endogenous L-Arg/NOS/NO pathway induced by water immersion restraint (WIR) stress. Methods: After 7 h of WIR stress, the aortic intima was isolated and prepared the platelet, then NO_2- production released from aortic intima and platelet was measured with Greiss regent, NOS activity and L-arginine transport activity were detected by isotope tracer method. Results: After 7 h of WIR stress, the levels of NO_2- from platelet and aortic intima obviously decreased by 57% and 46% respectively as comparied with the control rats (P

Hydrogen sulfide down-regulation of L-arginine/nitric oxide synthase/NO pathway in aortic tissues of rat / 中国药理学通报

Aim To observe the influence of hydrogen sulfide on L-arginine/nitric oxide synthase(NOS)/NO pathway,explore the interaction between H_2S and NO as cardiovascular regulatory gasotransmitters.Methods Aortic thin slices in vitro were administrated with NaHS(10~(-7) mol?L~(-1)～10~(-4) mol?L~(-1)),a donor of H_2S,and incubated for 4 hours,or 50 ?mol?L~(-1) NaHS and incubated for 2 h,4 h and 6 h,respectively.The nitrite production Was measured with greiss assay;NOS activity and L-arginine transportation,with isotope tracer method;the eNOS and CAT1-A gene expression,with RT-PCR.Results After being given with NaHS(50 ?mol?L~(-1)) one time,and incubating for 2 h,the nitrite production decreased by 62%,NOS activity reduced by 48% and L-arginine transport decreased by 50%.After incubation for 6 h,the nitrite production further was inhibited by 19%(P0.05).NaHS(10~(-7) mol?L~(-1)～10~(-4) mol?L~(-1)) inhibited the L-arginine/NOS/NO pathway in a dose-dependent manner,and IC_(50) was 0.499,3.198 and 3.927 ?mol?L~(-1)(P

Clinical observation of Compound Shouwu Granule on hyperlipemia / 中成药

AIM: To observe the curative effect of Compound Shouwu Granule on hyperlipemia. METHODS: Compound Shouwu Granule was composed of Radix Polygoni multiflori,Fructus,Crataegi Hirudo,Radix Puerariae,Lobatae,etc.the herbs were extracted with the method of percolation respectively.Each gram of extract equals to 8.2 g original medicine material.to take 2 g,each time,twice a day.Six weeks was one treating course.Patients were treated for two treating course.The changes of total cholesterol(TC),triglyceride(TG),high density lipoprotein(HDL-C) s,low density lipoprotein(LDL-C)s,were compared before and after treatment. RESULTS: The blood fat descended obviously after 6 weeks treatment. After 12 weeks,the TC descended by 38.4%,the TG descended by 80.8%,the HDL-C went up (91.3%),the LDL-C descended by (30.9%)(P

Septic shock down-regulates L-arginine /NOS/NO pathway of platelet and aortic intima in rats / 中国病理生理杂志

AIM: To investigate alteration and cross link of the aortic and platelet endogenous L-arginine/NOS/NO pathway induced by septic shock.METHODS: The septic shock model was made in rats by caecal ligation and puncture.NO-2 /NO-3 production released from aortic and platelet was measured with Greiss assay.NOS activity and L-arginine transport activity were detected by isotope tracer method.RESULTS: Both in early and late stage of septic shock,NO-2 /NO-3 production,NOS activity,and the L-arginine transport from the aorta intima and platelets were obviously decreased,while those of the aorta media and adventitia were obviously increased(P0.05 and P