目的探讨姜黄素对B细胞淋巴瘤细胞系Raji细胞转录共激活因子P300的影响及对Raji细胞的作用及其机制。方法以不同浓度的姜黄素作用于体外培养Raji细胞,MTT法检测细胞生长抑制率,应用RT-PCR和蛋白印迹(W estern b lot)法检测Raji细胞中P30...目的探讨姜黄素对B细胞淋巴瘤细胞系Raji细胞转录共激活因子P300的影响及对Raji细胞的作用及其机制。方法以不同浓度的姜黄素作用于体外培养Raji细胞,MTT法检测细胞生长抑制率,应用RT-PCR和蛋白印迹(W estern b lot)法检测Raji细胞中P300的表达。结果①姜黄素具有明显的抑制Raji细胞生长作用,并呈明显的量效关系。②姜黄素作用24 h后,随着浓度剂量的增加P300的mRNA和蛋白表达而逐渐降低。低剂量(6.25μmol.L-1)组P300表达有一定的降低,但与对照组相比差异无显著性(P>0.05),而中、高剂量(12.5、25及50μmol.L-1)则抑制P300的表达(P<0.05)。结论姜黄素对B细胞淋巴瘤细胞系Raji细胞具有抗肿瘤细胞的增殖作用,并呈浓度依赖性。姜黄素能够抑制转录共激活因子P300的表达,可能是其重要的机制。展开更多
信号转导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)存在于细胞质、细胞核、线粒体及线粒体相关内质网膜中,是参与细胞增殖、分化、迁移和免疫调节等多种生理过程的信号转导蛋白。本文概述了STAT3的...信号转导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)存在于细胞质、细胞核、线粒体及线粒体相关内质网膜中,是参与细胞增殖、分化、迁移和免疫调节等多种生理过程的信号转导蛋白。本文概述了STAT3的结构、类型及进入线粒体的途径;阐述了STAT3对细胞的稳态调节,包括介导内质网Ca^(2+)转运的细胞抗凋亡作用、维持线粒体功能的作用机制和对脂质合成与分解代谢的调控机制,进一步从对造血干细胞的调控作用、骨骼肌的调节、线粒体稳态调节和对脂肪合成与代谢的调控等方面探讨了STAT3调控肉色的机制,以期为改善肉色提供理论参考。展开更多
Objective:To observe the effects of puerarin on the expressions of leptin receptor mRNA and phosphorylated Janus kinase 2 / phosphorylated signal transducers and activators of transcription 3 (P-JAK2/P-STAT3) proteins...Objective:To observe the effects of puerarin on the expressions of leptin receptor mRNA and phosphorylated Janus kinase 2 / phosphorylated signal transducers and activators of transcription 3 (P-JAK2/P-STAT3) proteins in the liver of rats with non-alcoholic fatty liver (NAFLD). Methods: A rat model of NAFLD was successfully established by feeding high-fat diet. All SD rats were randomly divided into blank control group, untreated group, simvastatin-treated group and puerarin-treated group. After four-week treatment, the levels of hepatic triglyceride and total cholesterol were analyzed by using an automatic biochemical analyzer. The pathology of the liver tissue was observed by light microscopy. Serum leptin level was detected by enzyme-linked immunosorbent assay, and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins in the liver of NAFLD rats were quantified by reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis respectively. Results: Puerarin significantly decreased the levels of hepatic triglyceride and total cholesterol in NAFLD rats. Fat degeneration and inflammatory reaction in liver tissues of NAFLD rats were ameliorated after puerarin treatment. The serum leptin level was increased and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins were up-regulated in puerarin-treated group. Conclusion: Puerarin can effectively attenuate liver lipid disorder and inflammation by improving the leptin resistance and enhancing the expressions of leptin receptor mRNA and P-JAK2/P-STAT3展开更多
文摘目的探讨姜黄素对B细胞淋巴瘤细胞系Raji细胞转录共激活因子P300的影响及对Raji细胞的作用及其机制。方法以不同浓度的姜黄素作用于体外培养Raji细胞,MTT法检测细胞生长抑制率,应用RT-PCR和蛋白印迹(W estern b lot)法检测Raji细胞中P300的表达。结果①姜黄素具有明显的抑制Raji细胞生长作用,并呈明显的量效关系。②姜黄素作用24 h后,随着浓度剂量的增加P300的mRNA和蛋白表达而逐渐降低。低剂量(6.25μmol.L-1)组P300表达有一定的降低,但与对照组相比差异无显著性(P>0.05),而中、高剂量(12.5、25及50μmol.L-1)则抑制P300的表达(P<0.05)。结论姜黄素对B细胞淋巴瘤细胞系Raji细胞具有抗肿瘤细胞的增殖作用,并呈浓度依赖性。姜黄素能够抑制转录共激活因子P300的表达,可能是其重要的机制。
文摘信号转导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)存在于细胞质、细胞核、线粒体及线粒体相关内质网膜中,是参与细胞增殖、分化、迁移和免疫调节等多种生理过程的信号转导蛋白。本文概述了STAT3的结构、类型及进入线粒体的途径;阐述了STAT3对细胞的稳态调节,包括介导内质网Ca^(2+)转运的细胞抗凋亡作用、维持线粒体功能的作用机制和对脂质合成与分解代谢的调控机制,进一步从对造血干细胞的调控作用、骨骼肌的调节、线粒体稳态调节和对脂肪合成与代谢的调控等方面探讨了STAT3调控肉色的机制,以期为改善肉色提供理论参考。
文摘Objective:To observe the effects of puerarin on the expressions of leptin receptor mRNA and phosphorylated Janus kinase 2 / phosphorylated signal transducers and activators of transcription 3 (P-JAK2/P-STAT3) proteins in the liver of rats with non-alcoholic fatty liver (NAFLD). Methods: A rat model of NAFLD was successfully established by feeding high-fat diet. All SD rats were randomly divided into blank control group, untreated group, simvastatin-treated group and puerarin-treated group. After four-week treatment, the levels of hepatic triglyceride and total cholesterol were analyzed by using an automatic biochemical analyzer. The pathology of the liver tissue was observed by light microscopy. Serum leptin level was detected by enzyme-linked immunosorbent assay, and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins in the liver of NAFLD rats were quantified by reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis respectively. Results: Puerarin significantly decreased the levels of hepatic triglyceride and total cholesterol in NAFLD rats. Fat degeneration and inflammatory reaction in liver tissues of NAFLD rats were ameliorated after puerarin treatment. The serum leptin level was increased and the expressions of leptin receptor mRNA and P-JAK2/P-STAT3 proteins were up-regulated in puerarin-treated group. Conclusion: Puerarin can effectively attenuate liver lipid disorder and inflammation by improving the leptin resistance and enhancing the expressions of leptin receptor mRNA and P-JAK2/P-STAT3