狼毒水煎液对A549细胞增殖及迁移的影响

〔目的〕观察狼毒水煎液对人肺癌A549细胞增殖和迁移的影响。〔方法〕MTT实验测定该药对人肺癌A549细胞增殖的影响,划痕实验法测定该药对人肺癌A549细胞迁移的影响。〔结果〕与对照组相比,狼毒水煎液对实验组肺癌A549细胞的增殖以及迁移均有一定的抑制作用,抑制作用与药物浓度呈正相关。〔结论〕狼毒水煎液对人类非小细胞型肺癌有一定的抑制作用。

人A549肺腺癌细胞中甲状旁腺激素相关蛋白的表达及其与性激素状态相关性的研究

目的探讨人A549肺腺癌细胞中甲状旁腺激素相关蛋白(PTHrP)的表达,以及性激素对其表达的影响。方法将人A549肺腺癌细胞培养48 h后,采用逆转录聚合酶链反应(RT-PCR)检测其雌激素受体(ER)-α、β,雄激素受体(AR),PTHrP mRNA的表达。再分别以不同浓度(0、0.5、1、5、10 nmol/L)的雌二醇和睾酮处理人A549肺腺癌细胞48 h,采用实时定量聚合酶链反应(PCR)检测其PTHrP mRNA的表达。结果在人A549肺腺癌细胞中有ERβ-、AR及PTHrP mRNA表达,而ER-α不表达。再以不同浓度的17β-雌二醇及睾酮处理人A549肺腺癌细胞48 h,17β-雌二醇处理后未检测到PTHrP mRNA的表达;浓度为0、0.5、1、5、10 nmol/L睾酮处理后PTHrP的表达量分别为100%、90%、75%、60%、25%。结论人A549肺腺癌细胞中有ERβ-、AR及PTHrP mRNA表达,性激素可调节PTHrP mRNA的分泌,其中AR对PTHrP mRNA起负调节作用。

Empirical studies about quercetin increasing chemosensitivity on human lung adenocarcinoma cell line A549

Objective： The present study was designed to investigate whether quercetin exerts increasing chemosensitivity on human lung adenocarcinoma cells when quercetin combined with cisplatin （DDP） and vincristine （VCR） in vitro respectively and its possible antitumor mechanism. To provide experimental proof for clinical combination application. Methods： Using intermittent administration of high dose VCR, human lung adenocarcinoma sensitive cell line （A549/S） was induced to VCR- resistant human lung adenocarcinoma cell line （A549NCR）. MTT assay was adapted for examing the 50% inhibition （IC50） value of DDP and VCR on A549/S and A549/VCR when quercetin combined with DDP and VCR respectively. Results： IC50 of DDP on A549/S and A549/VCR was 10.18 and 12.35 mg/L, and the IC50 of VCR on the two cell lines was 1.21 and 12.77 rag/L, respectively. The resistance fold of A549/VCR on VCR and DDP was 10.55 and 121, respectively. When quercetin at concentration of 50, 100 and 200 pmol/L in combination with DDP and VCR respectively, the IC50 of DDP and VCR on A549/S and A549/VCR were obvious decreased （P 〈 0.05 - P 〈 0.01）. Conclusion： The experiment results suggested that quercetin could increase the chemosensitivity and partly revise the resistance of A549NCR.

rmhTNF-α Combined with Cisplatin Inhibits Proliferation of A549 Cell Line In Vitro

Objective To explore the inhibitory effect of recombinant mutant human tumor necrosis factor-α(rmhTNF-α) in combination with cisplatin on human lung adenocarcinoma cell line A549. Methods Human lung adenocarcinoma cell line A549 was treated with varying concentrations of rmhTNF-α(0.38, 0.75, 1.50, 6.00 and 12.00 IU/ml) or cisplatin(3.91, 7.81, 15.63, 31.25 and 62.50 μg/ml) for 24 hours. Viable cell number was analyzed by using crystal violet staining. The inhibitory rates of A549 cells growth by the two drugs were calculated. For analyzing whether there was a synergistic effect of rmhTNF-α with cisplatin, A549 cells were treated with 0.75 IU/ml rmhTNF-α and increased concentrations of cisplatin. Results rmhTNF-α or cisplatin inhibited the growth of A549 cell lines in a dose-dependent manner. The inhibitory effect of rmhTNF-α combined with cisplatin was significantly greater than cisplatin alone at the same concentration(all P<0.01). Conclusion rmhTNF-α combined with cisplatin might have synergistic inhibitory effect on human lung adenocarcinoma cell line A549.

Effects of herpes simplex virus thymidine kinase/acyclovir system on growth of human pulmonary adenocarcinoma A549 cell line in vitro and in vivo

Objective: To observe the effect of anciclovir (ACV) treatment on tumors induced by inoculation of TK gene-transfected human pulmonary adenocarcinoma A549 cells in nude mice. Methods: A recombinant plasmid containing TK gene was constructed and transfected into A549 cells by electroporation. The sensitivity of the transgenic cells (A549-TK) to ACV was examined by MTT assay in vitro and for in vivo observation, inoculation of A549-TK and A-549 cells into nude mice was separately performed to induce tumor growth, the response of which to ACV treatment was observed, and the tumor tissues were pathologically examined. Results: A recombinant plasmid containing TK gene was successfully constructed and transfected into A549 cells. The sensitivity of A549-TK cells to ACV was 43 times higher than that of A549 cells. The tumors induced by A549-TK cells showed no significant increase in size after ACV treatment (P>0. 05) , and light microscopy revealed local tissue necrosis, karyoklasis, and nuclei disappearance. Conclusion: A549-TK cells acquires sensitivity to ACV both in vitro and in vivo, and ACV can inhibit the growth of tumors induced by A549-TK cell inoculation in nude mice.

Anti-angiogenesis effect of Demethyl bryoanthrathiophene(DBT) in vitro

Objective:The aim of the study was to investigate the effect of Demethyl bryoanthrathiophene(DBT) on proliferations of human umbilical vein endothelial cells(HUVECs) and human lung adenocarcinoma cell line A549,and antiangiogenic effect of DBT on HUVECs in vitro.Methods:MTT assay was used to observe the effect of DBT on proliferations of HUVECs and A549 cells,flat plate scarification assay and tube formation in vitro test were used to observe the impact of DBT on migration and vaso-formed ability of HUVECs.The effects of DBT on apoptosis and cell cycle of HUVECs were calculated by flow cytometry.Results:MTT assay showed that treatment with DBT resulted in strong inhibition to the growth of HUVECs and A549 cells.The inhibition effects of DBT on HUVECs and A549 cells were related to dosage and times of dependency.In different doses of DBT(0.16,0.32 and 0.48 μmol/L) of flat plate scarification for 24 h,inhibition rates of DBT to migration of HUVECs were 14.70%,38.23% and 58.82%,respectively.In dose of DBT from 0.04,0.20 to 0.40 μmol/L for 24 h in tube formation,there were significance differences(P < 0.01) in the decreasing number of angiogenesis and incomplete blood vessel compared with control groups.All results showed that DBT promoted the apoptosis rate of HUVECs,and the increase of concentration of DBT accompanied the acceleration of apoptosis rate.Conclusion:DBT could inhibit the proliferations of HUVECs and A549 cells,and effectively suppress angiogenesis in vitro.