[目的]研究氯化锰对人骨髓神经母细胞瘤细胞株(SH-SY5Y)线粒体损伤、氧化应激、多巴胺分泌及PARK2表达的影响。[方法]0、100、300、500μmol/L浓度氯化锰染毒SH-SY5Y细胞24 h后,用MTT法测细胞抑制率(反映线粒体损伤情况),石墨炉原子吸...[目的]研究氯化锰对人骨髓神经母细胞瘤细胞株(SH-SY5Y)线粒体损伤、氧化应激、多巴胺分泌及PARK2表达的影响。[方法]0、100、300、500μmol/L浓度氯化锰染毒SH-SY5Y细胞24 h后,用MTT法测细胞抑制率(反映线粒体损伤情况),石墨炉原子吸收光谱法测定细胞内锰浓度,高度水溶性四唑盐(WST-1)法测定细胞内超氧化物歧化酶(SOD)活性,硫代巴比妥酸法测定细胞内丙二醛(MDA)含量,反相高效液相色谱-荧光法测定细胞内多巴胺(DA)含量,实时荧光定量-PCR检测PARK2 m RNA表达,蛋白免疫印迹法检测Parkin蛋白表达。[结果]与对照组比较,MnCl2浓度为300、500μmol/L时,细胞抑制率(线粒体损伤)增高(P<0.01)。与对照组比较,染锰组细胞内锰浓度升高(P<0.05或P<0.01)。与对照组比较,MnCl2浓度为300、500μmol/L时,SOD活性和DA含量降低(P<0.01),MDA含量升高(P<0.01);细胞PARK2 m RNA表达和Parkin蛋白表达降低(P<0.01)。相关性分析显示,PARK2 m RNA表达与细胞抑制率(线粒体损伤)、细胞内锰浓度及MDA含量呈负相关,r值分别为-0.872、-0.880、-0.862(均P<0.01);PARK2 m RNA表达与SOD活性、DA含量以及Parkin蛋白表达呈正相关,r值分别为0.879、0.859、0.809(均P<0.01)。[结论]氯化锰暴露可引起SH-SY5Y细胞的线粒体损伤、氧化应激、DA分泌减少和PARK2表达下降。展开更多
目的探讨重组人促红细胞生成素(r HuEPO)治疗多发性骨髓瘤小鼠的疗效及其可能作用机制。方法 420只BALB/c小鼠,荷瘤组410只和正常对照组10只。荷瘤组小鼠均皮下接种1×104个MPC-11骨髓瘤细胞,荷瘤后第5 d随机抽取50只作为荷瘤对照组...目的探讨重组人促红细胞生成素(r HuEPO)治疗多发性骨髓瘤小鼠的疗效及其可能作用机制。方法 420只BALB/c小鼠,荷瘤组410只和正常对照组10只。荷瘤组小鼠均皮下接种1×104个MPC-11骨髓瘤细胞,荷瘤后第5 d随机抽取50只作为荷瘤对照组,余小鼠随机分为3个不同剂量的r HuEPO(10 I U、20 I U、30 I U)治疗组,120只/组。r HuEPO皮下注射,每天1次,连续注射2周后减为1周3次。荷瘤对照组小鼠接受生理盐水皮下注射。荷瘤后动态监测血清M蛋白的出现时间,检测小鼠血红蛋白(Hb)水平,并取皮下结节进行病理检查。测定血清IL-6、TNF-α、TNF-γ、IgG、κ轻链浓度,全血CD4+、CD8+细胞计数(流式细胞分析方法),肿瘤组织的微血管密度(MVD)以及肿瘤细胞凋亡(TUNEL法)。结果荷瘤后22 d检测到荷瘤小鼠血清中出现M蛋白;r HuEPO治疗后,各治疗组的Hb水平及生存时间均高于荷瘤对照组(P<0.05),各治疗组间差异无统计学意义(P>0.05);r HuEPO应用2月后,各治疗组血清IL-6、IgG及κ轻链的浓度均低于荷瘤对照组(P<0.05);荷瘤小鼠的总体生存时间与Hb水平呈正相关(P=0.000)、与血清IL-6水平呈负相关(P=0.009)。结论 r HuEPO明显提高荷瘤小鼠的Hb水平并延长其生存时间,同时降低其血清IL-6水平和M蛋白水平。展开更多
Objective:To find out how to overcome resistance during multiple myeloma(MM) treatment through establishing a multidrug resistant human multiple myeloma cell line and investigating its biological features.Methods:The ...Objective:To find out how to overcome resistance during multiple myeloma(MM) treatment through establishing a multidrug resistant human multiple myeloma cell line and investigating its biological features.Methods:The parent cell line MOLP-2 was exposed to different concentrations of melphalan and a melphalan-resistant cell line MOLP-2/R was identified by continuous stepwise selection.The cell morphology and growth curves were examined.Protein levels of P-gp, MRP and FANCD2 monoubiquitination were checked by Western blotting.The IC50 of melphalan and resistance index(RI) were detected by MTT assay.Results:A melphalan-resistant cell line MOLP-2/R was finally identified.The RI of MOLP-2/R cells to melphalan was 6.03.Besides melphalan it was cross resistant to other chemotherapeutic agents, including ADM, CTX, DDP and VP-16.The multiplication time was postponed(P < 0.05).Studies showed that FANCD2 protein monoubiquitination was enhanced, but the levels of P-gp and MRP expressions in the MOLP-2/R cells were similar with the parent cells.Conclusion:MOLP-2/R cell line may serve as an ideal model for exploring the mechanism of MDR.Over-expression of FANCD2 protein monoubiquitination might contribute to acquired drug resistance in MOLP-2/R cell line.展开更多
文摘[目的]研究氯化锰对人骨髓神经母细胞瘤细胞株(SH-SY5Y)线粒体损伤、氧化应激、多巴胺分泌及PARK2表达的影响。[方法]0、100、300、500μmol/L浓度氯化锰染毒SH-SY5Y细胞24 h后,用MTT法测细胞抑制率(反映线粒体损伤情况),石墨炉原子吸收光谱法测定细胞内锰浓度,高度水溶性四唑盐(WST-1)法测定细胞内超氧化物歧化酶(SOD)活性,硫代巴比妥酸法测定细胞内丙二醛(MDA)含量,反相高效液相色谱-荧光法测定细胞内多巴胺(DA)含量,实时荧光定量-PCR检测PARK2 m RNA表达,蛋白免疫印迹法检测Parkin蛋白表达。[结果]与对照组比较,MnCl2浓度为300、500μmol/L时,细胞抑制率(线粒体损伤)增高(P<0.01)。与对照组比较,染锰组细胞内锰浓度升高(P<0.05或P<0.01)。与对照组比较,MnCl2浓度为300、500μmol/L时,SOD活性和DA含量降低(P<0.01),MDA含量升高(P<0.01);细胞PARK2 m RNA表达和Parkin蛋白表达降低(P<0.01)。相关性分析显示,PARK2 m RNA表达与细胞抑制率(线粒体损伤)、细胞内锰浓度及MDA含量呈负相关,r值分别为-0.872、-0.880、-0.862(均P<0.01);PARK2 m RNA表达与SOD活性、DA含量以及Parkin蛋白表达呈正相关,r值分别为0.879、0.859、0.809(均P<0.01)。[结论]氯化锰暴露可引起SH-SY5Y细胞的线粒体损伤、氧化应激、DA分泌减少和PARK2表达下降。
文摘目的探讨重组人促红细胞生成素(r HuEPO)治疗多发性骨髓瘤小鼠的疗效及其可能作用机制。方法 420只BALB/c小鼠,荷瘤组410只和正常对照组10只。荷瘤组小鼠均皮下接种1×104个MPC-11骨髓瘤细胞,荷瘤后第5 d随机抽取50只作为荷瘤对照组,余小鼠随机分为3个不同剂量的r HuEPO(10 I U、20 I U、30 I U)治疗组,120只/组。r HuEPO皮下注射,每天1次,连续注射2周后减为1周3次。荷瘤对照组小鼠接受生理盐水皮下注射。荷瘤后动态监测血清M蛋白的出现时间,检测小鼠血红蛋白(Hb)水平,并取皮下结节进行病理检查。测定血清IL-6、TNF-α、TNF-γ、IgG、κ轻链浓度,全血CD4+、CD8+细胞计数(流式细胞分析方法),肿瘤组织的微血管密度(MVD)以及肿瘤细胞凋亡(TUNEL法)。结果荷瘤后22 d检测到荷瘤小鼠血清中出现M蛋白;r HuEPO治疗后,各治疗组的Hb水平及生存时间均高于荷瘤对照组(P<0.05),各治疗组间差异无统计学意义(P>0.05);r HuEPO应用2月后,各治疗组血清IL-6、IgG及κ轻链的浓度均低于荷瘤对照组(P<0.05);荷瘤小鼠的总体生存时间与Hb水平呈正相关(P=0.000)、与血清IL-6水平呈负相关(P=0.009)。结论 r HuEPO明显提高荷瘤小鼠的Hb水平并延长其生存时间,同时降低其血清IL-6水平和M蛋白水平。
文摘Objective:To find out how to overcome resistance during multiple myeloma(MM) treatment through establishing a multidrug resistant human multiple myeloma cell line and investigating its biological features.Methods:The parent cell line MOLP-2 was exposed to different concentrations of melphalan and a melphalan-resistant cell line MOLP-2/R was identified by continuous stepwise selection.The cell morphology and growth curves were examined.Protein levels of P-gp, MRP and FANCD2 monoubiquitination were checked by Western blotting.The IC50 of melphalan and resistance index(RI) were detected by MTT assay.Results:A melphalan-resistant cell line MOLP-2/R was finally identified.The RI of MOLP-2/R cells to melphalan was 6.03.Besides melphalan it was cross resistant to other chemotherapeutic agents, including ADM, CTX, DDP and VP-16.The multiplication time was postponed(P < 0.05).Studies showed that FANCD2 protein monoubiquitination was enhanced, but the levels of P-gp and MRP expressions in the MOLP-2/R cells were similar with the parent cells.Conclusion:MOLP-2/R cell line may serve as an ideal model for exploring the mechanism of MDR.Over-expression of FANCD2 protein monoubiquitination might contribute to acquired drug resistance in MOLP-2/R cell line.