目的:观察红曲红色素组分Ⅰ(Monascus red pigments section I,MRPI)对实验小鼠血脂代谢的影响。方法:昆明种雌性小鼠48只,按血脂水平分为6组:正常对照组、高脂对照组、绞股蓝总甙阳性对照组、MRPI低、中、高剂量组。正常对照组喂饲基...目的:观察红曲红色素组分Ⅰ(Monascus red pigments section I,MRPI)对实验小鼠血脂代谢的影响。方法:昆明种雌性小鼠48只,按血脂水平分为6组:正常对照组、高脂对照组、绞股蓝总甙阳性对照组、MRPI低、中、高剂量组。正常对照组喂饲基础饲料,其它各组喂饲高脂饲料;按剂量分别灌胃给药6w,禁食12h后,测定小鼠血脂水平和相关指标。结果:实验6w末,MRPI低、中、高各剂量(10、50、100mg/kg·d)组使实验小鼠血清AI值(TC-HDL-C/HDL-C)均极显著低于高脂组(p<0.01);MRPI中、高各剂量组和绞股蓝总甙阳性对照组使实验小鼠血清TC、血清TG、血清LDL-C和肝组织TC均极显著低于高脂组(p<0.01);MRPI低、中、高剂量组血脂水平与高脂组相比,显著升高血清HDL-C。结论:提示MRPI红曲红色素组分I对实验小鼠血清血脂代谢具有良好的脂质代谢调节作用,有效抑制脂质过氧化和预防动脉粥样硬化作用,且呈剂量正相关关系。展开更多
The roles of multi-drug resistance protein 1 （MDR1）, multi-drug resistance related protein 1 （MRP1）, lung resistance protein （LRP） and breast cancer resistance protein （BCRP） in the multi-drug resistance （MDR...The roles of multi-drug resistance protein 1 （MDR1）, multi-drug resistance related protein 1 （MRP1）, lung resistance protein （LRP） and breast cancer resistance protein （BCRP） in the multi-drug resistance （MDR） of hepatocellular carcinoma （HCC） were studied. By exposing HepG2 cell line to progressively increased concentrations of adriamycin （ADM）, HepG2 multi-drug resistant subline （HepG2/ADM） was induced. The MDR index of HepG2/ADM was detected by using MTT. The expressions of the four MDR proteins in the three cell lines （L02, HepG2, HepG2/ADM） were investigated at mRNA and protein levels by real-time RT-PCR and Western blot respectively. Our results showed that when the ADM concentration was under 100 pg/L, HepG2 could easily be induced to be drug-resistant. The IC50 of the HepG2/ADM to ADM was 282 times that of HepG2. The expression of MDR1 and BCRP mRNA in HepG2/ADM cells were 400 and 9 times that of HepG2 cells respectively while there was no difference in the mRNA expressions of MRPl and LRE There was no difference between HepG2 and L02 cells in the mRNA expressions of the four genes. At the protein level, the expressions of MDRI, BCRP and LRP but MRPl in HepG2/ADM were significantly higher than those of HepG2 and L02. Between HepG2 and L02, there was no difference in the expressions of four genes at the protein level. HepG2/ADM is a good model for the study of MDR. The four genes are probably the normally expressed gene in liver. The expressions of MDRl and BCRP could be up-regulated by anti-cancer agents in vitro. The MDR of HCC was mainly due to the up-regulation of MDR1 and BCRP but MRP1 and LRE These findings suggest they may serve as targets for the reversal of MDR of HCC.展开更多
Fused deposition modeling （FDM） is an additive manufacturing technique used to fabricate intricate parts in 3D, within the shortest possible time without using tools, dies, fixtures, or human intervention. This arti...Fused deposition modeling （FDM） is an additive manufacturing technique used to fabricate intricate parts in 3D, within the shortest possible time without using tools, dies, fixtures, or human intervention. This article empiri- cally reports the effects of the process parameters, i.e., the layer thickness, raster angle, raster width, air gap, part orientation, and their interactions on the accuracy of the length, width, and thicknes, of acrylonitrile-butadiene- styrene （ABSP 400） parts fabricated using the FDM tech- nique. It was found that contraction prevailed along the directions of the length and width, whereas the thickness increased from the desired value of the fabricated part. Optimum parameter settings to minimize the responses, such as the change in length, width, and thickness of the test specimen, have been determined using Taguchi＇s parameter design. Because Taguchi＇s philosophy fails to obtain uniform optimal factor settings for each response, in this study, a fuzzy inference system combined with the Taguchi philosophy has been adopted to generate a single response from three responses, to reach the specific target values with the overall optimum factor level settings. Further, Taguchi and artificial neural network predictive models are also presented in this study for an accuracy evaluation within the dimensions of the FDM fabricated parts, subjected to various operating conditions. The pre- dicted values obtained from both models are in good agreement with the values from the experiment data, with mean absolute percentage errors of 3.16 and 0.15, respectively. Finally, the confirmatory test results showed an improvement in the multi-response performance index of 0.454 when using the optimal FDM parameters over the initial values.展开更多
文摘目的:观察红曲红色素组分Ⅰ(Monascus red pigments section I,MRPI)对实验小鼠血脂代谢的影响。方法:昆明种雌性小鼠48只,按血脂水平分为6组:正常对照组、高脂对照组、绞股蓝总甙阳性对照组、MRPI低、中、高剂量组。正常对照组喂饲基础饲料,其它各组喂饲高脂饲料;按剂量分别灌胃给药6w,禁食12h后,测定小鼠血脂水平和相关指标。结果:实验6w末,MRPI低、中、高各剂量(10、50、100mg/kg·d)组使实验小鼠血清AI值(TC-HDL-C/HDL-C)均极显著低于高脂组(p<0.01);MRPI中、高各剂量组和绞股蓝总甙阳性对照组使实验小鼠血清TC、血清TG、血清LDL-C和肝组织TC均极显著低于高脂组(p<0.01);MRPI低、中、高剂量组血脂水平与高脂组相比,显著升高血清HDL-C。结论:提示MRPI红曲红色素组分I对实验小鼠血清血脂代谢具有良好的脂质代谢调节作用,有效抑制脂质过氧化和预防动脉粥样硬化作用,且呈剂量正相关关系。
基金This project was supported by a grant from the Foundation for Key Scientific Research Programs of Ministry of Health of China (No. 20012003)
文摘The roles of multi-drug resistance protein 1 （MDR1）, multi-drug resistance related protein 1 （MRP1）, lung resistance protein （LRP） and breast cancer resistance protein （BCRP） in the multi-drug resistance （MDR） of hepatocellular carcinoma （HCC） were studied. By exposing HepG2 cell line to progressively increased concentrations of adriamycin （ADM）, HepG2 multi-drug resistant subline （HepG2/ADM） was induced. The MDR index of HepG2/ADM was detected by using MTT. The expressions of the four MDR proteins in the three cell lines （L02, HepG2, HepG2/ADM） were investigated at mRNA and protein levels by real-time RT-PCR and Western blot respectively. Our results showed that when the ADM concentration was under 100 pg/L, HepG2 could easily be induced to be drug-resistant. The IC50 of the HepG2/ADM to ADM was 282 times that of HepG2. The expression of MDR1 and BCRP mRNA in HepG2/ADM cells were 400 and 9 times that of HepG2 cells respectively while there was no difference in the mRNA expressions of MRPl and LRE There was no difference between HepG2 and L02 cells in the mRNA expressions of the four genes. At the protein level, the expressions of MDRI, BCRP and LRP but MRPl in HepG2/ADM were significantly higher than those of HepG2 and L02. Between HepG2 and L02, there was no difference in the expressions of four genes at the protein level. HepG2/ADM is a good model for the study of MDR. The four genes are probably the normally expressed gene in liver. The expressions of MDRl and BCRP could be up-regulated by anti-cancer agents in vitro. The MDR of HCC was mainly due to the up-regulation of MDR1 and BCRP but MRP1 and LRE These findings suggest they may serve as targets for the reversal of MDR of HCC.
文摘Fused deposition modeling （FDM） is an additive manufacturing technique used to fabricate intricate parts in 3D, within the shortest possible time without using tools, dies, fixtures, or human intervention. This article empiri- cally reports the effects of the process parameters, i.e., the layer thickness, raster angle, raster width, air gap, part orientation, and their interactions on the accuracy of the length, width, and thicknes, of acrylonitrile-butadiene- styrene （ABSP 400） parts fabricated using the FDM tech- nique. It was found that contraction prevailed along the directions of the length and width, whereas the thickness increased from the desired value of the fabricated part. Optimum parameter settings to minimize the responses, such as the change in length, width, and thickness of the test specimen, have been determined using Taguchi＇s parameter design. Because Taguchi＇s philosophy fails to obtain uniform optimal factor settings for each response, in this study, a fuzzy inference system combined with the Taguchi philosophy has been adopted to generate a single response from three responses, to reach the specific target values with the overall optimum factor level settings. Further, Taguchi and artificial neural network predictive models are also presented in this study for an accuracy evaluation within the dimensions of the FDM fabricated parts, subjected to various operating conditions. The pre- dicted values obtained from both models are in good agreement with the values from the experiment data, with mean absolute percentage errors of 3.16 and 0.15, respectively. Finally, the confirmatory test results showed an improvement in the multi-response performance index of 0.454 when using the optimal FDM parameters over the initial values.
