抗精神病药物是治疗精神分裂症的主要药物,但其使用会导致脂代谢紊乱,从而增加患者发生心血管疾病的风险,缩短患者的预期寿命,并严重影响治疗的依从性。目前,抗精神病药物引起脂代谢紊乱的具体机制尚不清楚。固醇调节元件结合蛋白(stero...抗精神病药物是治疗精神分裂症的主要药物,但其使用会导致脂代谢紊乱,从而增加患者发生心血管疾病的风险,缩短患者的预期寿命,并严重影响治疗的依从性。目前,抗精神病药物引起脂代谢紊乱的具体机制尚不清楚。固醇调节元件结合蛋白(sterol regulatory element binding protein,SREBP)是调控脂代谢的关键转录因子。前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)作为SREBP下游调控基因之一,对低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)具有重要的调控作用,是最近降脂药物研究的重要靶点。近期研究表明,抗精神病药物可以通过SREBP/PCSK9通路影响脂代谢。深入了解该通路在抗精神药物相关代谢异常中的作用机制将促进精神分裂症患者脂代谢紊乱的预防和新药的研发应用。展开更多
Bone Morphogenetic proteins(BMPs)like BMP2 and BMP7 have shown great potential in the treatment of severe bone defects.In recent in vitro studies,BMP9 revealed the highest osteogenic potential compared to other BMPs,p...Bone Morphogenetic proteins(BMPs)like BMP2 and BMP7 have shown great potential in the treatment of severe bone defects.In recent in vitro studies,BMP9 revealed the highest osteogenic potential compared to other BMPs,possibly due to its unique signaling pathways that differs from other osteogenic BMPs.However,in vivo the bone forming capacity of BMP9-adsorbed scaffolds is not superior to BMP2 or BMP7.In silico analysis of the BMP9 protein sequence revealed that BMP9,in contrast to other osteogenic BMPs such as BMP2,completely lacks so-called heparin binding motifs that enable extracellular matrix(ECM)interactions which in general might be essential for the BMPs’osteogenic function.Therefore,we genetically engineered a new BMP9 variant by adding BMP2-derived heparin binding motifs to the N-terminal segment of BMP9′s mature part.The resulting protein(BMP9 HB)showed higher heparin binding affinity than BMP2,similar osteogenic activity in vitro and comparable binding affinities to BMPR-II and ALK1 compared to BMP9.However,remarkable differences were observed when BMP9 HB was adsorbed to collagen scaffolds and implanted subcutaneously in the dorsum of rats,showing a consistent and significant increase in bone volume and density compared to BMP2 and BMP9.Even at 10-fold lower BMP9 HB doses bone tissue formation was observed.This innovative approach of significantly enhancing the osteogenic properties of BMP9 simply by addition of ECM binding motifs,could constitute a valuable replacement to the commonly used BMPs.The possibility to use lower protein doses demonstrates BMP9 HB’s high translational potential.展开更多
目的:观察Ran结合蛋白M(RanBPM)对肾小管钠-氯共同转运子(NCC)蛋白表达及相关ERK1/2信号通路蛋白表达的影响。方法:免疫共沉淀检测RanBPM蛋白与WNK4蛋白是否存在直接相互作用;观察转染RanBPM质粒对EGF诱导细胞ERK1/2磷酸化的影响,通过...目的:观察Ran结合蛋白M(RanBPM)对肾小管钠-氯共同转运子(NCC)蛋白表达及相关ERK1/2信号通路蛋白表达的影响。方法:免疫共沉淀检测RanBPM蛋白与WNK4蛋白是否存在直接相互作用;观察转染RanBPM质粒对EGF诱导细胞ERK1/2磷酸化的影响,通过转染质粒过表达RanBPM蛋白或siRNA抑制RanBPM基因,免疫蛋白印迹法检测细胞内源性NCC蛋白含量和ERK1/2磷酸化水平的变化。结果:免疫共沉淀实验证实WNK4和RanBPM之间存在直接的相互作用。RanBPM可以抑制EGF诱导的ERK1/2磷酸化。RanBPM过表达可使细胞ERK1/2磷酸化减少(1.000±0.074 vs. 0.275±0.041,P<0.01),而NCC蛋白表达增加(1.000±0.115 vs.1.470±0.105,P<0.01)。siRNA沉默RanBPM基因后,ERK1/2磷酸化增加(1.000±0.194 vs. 2.301±0.220,P<0.01),NCC蛋白表达下降(1.000±0.223 vs. 0.556±0.132,P<0.01)。转染RanBPM可阻止WNK4对ERK1/2信号通路的影响和对NCC蛋白表达的抑制作用。结论:RanBPM通过与WNK4相互作用,影响ERK1/2信号通路对NCC蛋白表达的调控作用。展开更多
文摘抗精神病药物是治疗精神分裂症的主要药物,但其使用会导致脂代谢紊乱,从而增加患者发生心血管疾病的风险,缩短患者的预期寿命,并严重影响治疗的依从性。目前,抗精神病药物引起脂代谢紊乱的具体机制尚不清楚。固醇调节元件结合蛋白(sterol regulatory element binding protein,SREBP)是调控脂代谢的关键转录因子。前蛋白转化酶枯草溶菌素9(proprotein convertase subtilisin/kexin type 9,PCSK9)作为SREBP下游调控基因之一,对低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)具有重要的调控作用,是最近降脂药物研究的重要靶点。近期研究表明,抗精神病药物可以通过SREBP/PCSK9通路影响脂代谢。深入了解该通路在抗精神药物相关代谢异常中的作用机制将促进精神分裂症患者脂代谢紊乱的预防和新药的研发应用。
文摘Bone Morphogenetic proteins(BMPs)like BMP2 and BMP7 have shown great potential in the treatment of severe bone defects.In recent in vitro studies,BMP9 revealed the highest osteogenic potential compared to other BMPs,possibly due to its unique signaling pathways that differs from other osteogenic BMPs.However,in vivo the bone forming capacity of BMP9-adsorbed scaffolds is not superior to BMP2 or BMP7.In silico analysis of the BMP9 protein sequence revealed that BMP9,in contrast to other osteogenic BMPs such as BMP2,completely lacks so-called heparin binding motifs that enable extracellular matrix(ECM)interactions which in general might be essential for the BMPs’osteogenic function.Therefore,we genetically engineered a new BMP9 variant by adding BMP2-derived heparin binding motifs to the N-terminal segment of BMP9′s mature part.The resulting protein(BMP9 HB)showed higher heparin binding affinity than BMP2,similar osteogenic activity in vitro and comparable binding affinities to BMPR-II and ALK1 compared to BMP9.However,remarkable differences were observed when BMP9 HB was adsorbed to collagen scaffolds and implanted subcutaneously in the dorsum of rats,showing a consistent and significant increase in bone volume and density compared to BMP2 and BMP9.Even at 10-fold lower BMP9 HB doses bone tissue formation was observed.This innovative approach of significantly enhancing the osteogenic properties of BMP9 simply by addition of ECM binding motifs,could constitute a valuable replacement to the commonly used BMPs.The possibility to use lower protein doses demonstrates BMP9 HB’s high translational potential.
文摘目的:观察Ran结合蛋白M(RanBPM)对肾小管钠-氯共同转运子(NCC)蛋白表达及相关ERK1/2信号通路蛋白表达的影响。方法:免疫共沉淀检测RanBPM蛋白与WNK4蛋白是否存在直接相互作用;观察转染RanBPM质粒对EGF诱导细胞ERK1/2磷酸化的影响,通过转染质粒过表达RanBPM蛋白或siRNA抑制RanBPM基因,免疫蛋白印迹法检测细胞内源性NCC蛋白含量和ERK1/2磷酸化水平的变化。结果:免疫共沉淀实验证实WNK4和RanBPM之间存在直接的相互作用。RanBPM可以抑制EGF诱导的ERK1/2磷酸化。RanBPM过表达可使细胞ERK1/2磷酸化减少(1.000±0.074 vs. 0.275±0.041,P<0.01),而NCC蛋白表达增加(1.000±0.115 vs.1.470±0.105,P<0.01)。siRNA沉默RanBPM基因后,ERK1/2磷酸化增加(1.000±0.194 vs. 2.301±0.220,P<0.01),NCC蛋白表达下降(1.000±0.223 vs. 0.556±0.132,P<0.01)。转染RanBPM可阻止WNK4对ERK1/2信号通路的影响和对NCC蛋白表达的抑制作用。结论:RanBPM通过与WNK4相互作用,影响ERK1/2信号通路对NCC蛋白表达的调控作用。
