It is important to improve the comprehensive performance of the ductile iron bars(DIBs)for the cylinder block of the extra high pressure hydraulic plunger pump and accelerate the industrial application.In this work,th...It is important to improve the comprehensive performance of the ductile iron bars(DIBs)for the cylinder block of the extra high pressure hydraulic plunger pump and accelerate the industrial application.In this work,the LZQT600-3 DIBs with the diameter of 145 mm were prepared by the horizontal continuous casting(HCC)process,that is,LZQT600-3 HCCDIBs.The microstructure and room temperature tensile properties of different sections[left-edge(surface layer),left-1/2R(left half of the radius),and the center of the HCCDIBs]were studied.The results show that the spheroidization of LZQT600-3 HCCDIBs matrix from the left-edge,left-1/2R to the center is at nodulizing grade II and above.As the cooling rate gradually decreases from surface to the center of the HCCIBs,the number of spheroidized graphite is gradually reduced,the size is gradually increased,the shape factor is decreased,and the pearlite content and lamellate spacing are increased.Along the horizontal direction of the section,the hardness of the material is distributed symmetrically around the center of the HCCDIBs.In the vertical direction,the hardness distribution in the center of the HCCDIBs is asymmetrical due to the gravity during the solidification process.Therefore,the microstructure in the lower part of the section solidifies relatively quickly.The left-edge has the best tensile mechanical properties,and the ultimate tensile strength,yield tensile strength and elongation are 597.3 MPa,418.5 MPa and 9.6%,respectively.The tensile fracture belongs to the ductile-brittle hybrid fracture.The comprehensive performances of LZQT600-3 HCCDIBs meet the actual application requirements of ultra-high pressure hydraulic plunger pump cylinder.展开更多
Hepatocellular carcinoma (HCC) is a cancer with high incidence and mortality rates worldwide. In the various treatment methods for HCC, the lack of cancer cell specificity and the development of multidrug resistance (...Hepatocellular carcinoma (HCC) is a cancer with high incidence and mortality rates worldwide. In the various treatment methods for HCC, the lack of cancer cell specificity and the development of multidrug resistance (MDR) are two major obstacles in the treatment of HCC. P-glycoprotein (P-gp) is an ATP-dependent drug efflux pump that can reduce the accumulation of drugs in cells and make cancer cells acquire drug resistance. D-α-tocopheryl polyethylene glycol succinate (Vitamin E TPGS or TPGS) can inhibit the activity of ATP-dependent P-gp and serves as an effective excipient for overcoming tumor multidrug resistance (MDR). TPGS has been approved by the FDA as a safe adjuvant and is widely used in drug delivery systems. The biological and physicochemical properties of TPGS provide multiple advantages for its application in drug delivery, such as high biocompatibility, enhanced drug solubility, improved drug permeation, and selective antitumor activity. In recent years, more and more studies have found that using TPGS-modified nanomaterials to load chemotherapy drugs to treat tumors can effectively reverse the drug resistance of tumors, including HCC. This review summarizes and discusses the role of TPGS in reversing tumor drug resistance and the therapeutic effects of TPGS-based drugs on drug-resistant HCC.展开更多
目的探讨薯蓣皂苷元对人三阴乳腺癌细胞系HCC1937增殖及凋亡的影响。方法对数生长期人三阴乳腺癌HCC1937细胞株分为空白组(培养液)、实验1组(培养液+10mg/L薯蓣皂苷元)、实验2组(培养液+25mg/L薯蓣皂苷元)。采用MTT法观察薯蓣皂苷元培...目的探讨薯蓣皂苷元对人三阴乳腺癌细胞系HCC1937增殖及凋亡的影响。方法对数生长期人三阴乳腺癌HCC1937细胞株分为空白组(培养液)、实验1组(培养液+10mg/L薯蓣皂苷元)、实验2组(培养液+25mg/L薯蓣皂苷元)。采用MTT法观察薯蓣皂苷元培养24、48、72h时HCC1937细胞生长抑制率;流式细胞仪检测薯蓣皂苷元培养48h时HCC1937细胞周期及细胞凋亡;Western blot法检测薯蓣皂苷元培养48h时Bcl-2、Bcl-2相关X蛋白(Bcl-2associated X protein,Bax)、P53、caspase3蛋白表达;Transwell实验观察薯蓣皂苷元培养24h时HCC1937细胞侵袭能力。结果薯蓣皂苷元培养24、48、72h,HCC1937细胞生长抑制率在实验1组分别为(6.86±2.56)%、(15.57±1.86)%、(14.84±4.64)%,在实验2组分别为(11.78±2.16)%、(24.48±3.70)%、(31.38±3.76)%,均高于空白组[(3.34±2.56)%、(8.47±1.86)%、(7.73±4.64)%](P<0.05),且实验2组高于实验1组(P<0.05);薯蓣皂苷元培养48h,实验1组G_1期细胞比例、细胞凋亡率分别为(36.21±3.12)%、(21.99±2.36)%,实验2组分别为(50.26±2.36)%、(26.17±3.46)%,均高于空白组[(28.35±2.54)%、(17.25±1.23)%](P<0.05),实验2组高于实验1组(P<0.05);薯蓣皂苷元培养24h,实验1组、实验2组HCC1937侵袭细胞数目[(64.00±11.01)%、(30.33±6.11)%]低于空白组[(146.00±9.16)%](P<0.05),实验2组低于实验1组(P<0.05);薯蓣皂苷元培养48h时,实验1组、实验2组HCC1937细胞Bcl-2表达量低于空白组,Bax、caspase3表达量高于空白组(P<0.05),实验1组Bcl-2表达量低于实验2组,Bax、caspase3表达量高于实验2组(P<0.05),3组P53蛋白表达量比较差异无统计学意义(P>0.05)。结论薯蓣皂苷元可抑制人三阴乳腺癌细胞系HCC1937增殖与侵袭,可能机制为使肿瘤细胞G_1期阻滞,下调抗凋亡蛋白Bcl-2表达,上调促凋亡蛋白Bax、caspase3表达。展开更多
基金the support from the International Science and Technology Cooperation Program of Shaanxi Province(No.2023-GHZD-50)the Projects of Major Innovation Platforms for Scientific and Technological and Local Transformation of Scientific and Technological Achievements of Xi’an(No.20GXSF0003)+1 种基金the Projects of Major Scientific and Technological Achievements Local Transformation of Xi’an(No.2022JH-ZDZH-0039)the Higher Education Institution Discipline Innovation and Intelligence Base of Shaanxi Provincial(No.S2021-ZC-GXYZ-0011)。
文摘It is important to improve the comprehensive performance of the ductile iron bars(DIBs)for the cylinder block of the extra high pressure hydraulic plunger pump and accelerate the industrial application.In this work,the LZQT600-3 DIBs with the diameter of 145 mm were prepared by the horizontal continuous casting(HCC)process,that is,LZQT600-3 HCCDIBs.The microstructure and room temperature tensile properties of different sections[left-edge(surface layer),left-1/2R(left half of the radius),and the center of the HCCDIBs]were studied.The results show that the spheroidization of LZQT600-3 HCCDIBs matrix from the left-edge,left-1/2R to the center is at nodulizing grade II and above.As the cooling rate gradually decreases from surface to the center of the HCCIBs,the number of spheroidized graphite is gradually reduced,the size is gradually increased,the shape factor is decreased,and the pearlite content and lamellate spacing are increased.Along the horizontal direction of the section,the hardness of the material is distributed symmetrically around the center of the HCCDIBs.In the vertical direction,the hardness distribution in the center of the HCCDIBs is asymmetrical due to the gravity during the solidification process.Therefore,the microstructure in the lower part of the section solidifies relatively quickly.The left-edge has the best tensile mechanical properties,and the ultimate tensile strength,yield tensile strength and elongation are 597.3 MPa,418.5 MPa and 9.6%,respectively.The tensile fracture belongs to the ductile-brittle hybrid fracture.The comprehensive performances of LZQT600-3 HCCDIBs meet the actual application requirements of ultra-high pressure hydraulic plunger pump cylinder.
文摘Hepatocellular carcinoma (HCC) is a cancer with high incidence and mortality rates worldwide. In the various treatment methods for HCC, the lack of cancer cell specificity and the development of multidrug resistance (MDR) are two major obstacles in the treatment of HCC. P-glycoprotein (P-gp) is an ATP-dependent drug efflux pump that can reduce the accumulation of drugs in cells and make cancer cells acquire drug resistance. D-α-tocopheryl polyethylene glycol succinate (Vitamin E TPGS or TPGS) can inhibit the activity of ATP-dependent P-gp and serves as an effective excipient for overcoming tumor multidrug resistance (MDR). TPGS has been approved by the FDA as a safe adjuvant and is widely used in drug delivery systems. The biological and physicochemical properties of TPGS provide multiple advantages for its application in drug delivery, such as high biocompatibility, enhanced drug solubility, improved drug permeation, and selective antitumor activity. In recent years, more and more studies have found that using TPGS-modified nanomaterials to load chemotherapy drugs to treat tumors can effectively reverse the drug resistance of tumors, including HCC. This review summarizes and discusses the role of TPGS in reversing tumor drug resistance and the therapeutic effects of TPGS-based drugs on drug-resistant HCC.
文摘目的探讨薯蓣皂苷元对人三阴乳腺癌细胞系HCC1937增殖及凋亡的影响。方法对数生长期人三阴乳腺癌HCC1937细胞株分为空白组(培养液)、实验1组(培养液+10mg/L薯蓣皂苷元)、实验2组(培养液+25mg/L薯蓣皂苷元)。采用MTT法观察薯蓣皂苷元培养24、48、72h时HCC1937细胞生长抑制率;流式细胞仪检测薯蓣皂苷元培养48h时HCC1937细胞周期及细胞凋亡;Western blot法检测薯蓣皂苷元培养48h时Bcl-2、Bcl-2相关X蛋白(Bcl-2associated X protein,Bax)、P53、caspase3蛋白表达;Transwell实验观察薯蓣皂苷元培养24h时HCC1937细胞侵袭能力。结果薯蓣皂苷元培养24、48、72h,HCC1937细胞生长抑制率在实验1组分别为(6.86±2.56)%、(15.57±1.86)%、(14.84±4.64)%,在实验2组分别为(11.78±2.16)%、(24.48±3.70)%、(31.38±3.76)%,均高于空白组[(3.34±2.56)%、(8.47±1.86)%、(7.73±4.64)%](P<0.05),且实验2组高于实验1组(P<0.05);薯蓣皂苷元培养48h,实验1组G_1期细胞比例、细胞凋亡率分别为(36.21±3.12)%、(21.99±2.36)%,实验2组分别为(50.26±2.36)%、(26.17±3.46)%,均高于空白组[(28.35±2.54)%、(17.25±1.23)%](P<0.05),实验2组高于实验1组(P<0.05);薯蓣皂苷元培养24h,实验1组、实验2组HCC1937侵袭细胞数目[(64.00±11.01)%、(30.33±6.11)%]低于空白组[(146.00±9.16)%](P<0.05),实验2组低于实验1组(P<0.05);薯蓣皂苷元培养48h时,实验1组、实验2组HCC1937细胞Bcl-2表达量低于空白组,Bax、caspase3表达量高于空白组(P<0.05),实验1组Bcl-2表达量低于实验2组,Bax、caspase3表达量高于实验2组(P<0.05),3组P53蛋白表达量比较差异无统计学意义(P>0.05)。结论薯蓣皂苷元可抑制人三阴乳腺癌细胞系HCC1937增殖与侵袭,可能机制为使肿瘤细胞G_1期阻滞,下调抗凋亡蛋白Bcl-2表达,上调促凋亡蛋白Bax、caspase3表达。
