Novel human interferon alpha 2b (hIFNα2b) muteins were developed by substituting cysteine residue (C) at positions 2 and 99 with aspartic acid residues (D). The mutein forms were then studied for pharmacokinetic prof...Novel human interferon alpha 2b (hIFNα2b) muteins were developed by substituting cysteine residue (C) at positions 2 and 99 with aspartic acid residues (D). The mutein forms were then studied for pharmacokinetic profile. In addition, the influence of charge on the protein structure was tested in vivo for the biodistribution pattern. Codon substitutions were performed by Polymerase Chain Reaction (PCR)-based site-directed mutagenesis on a previously constructed synthetic hIFNα2b open reading frame (ORF) cloned in pET32b expression plasmid. The result of nucleotide sequencing analysis confirmed that all codons were replaced successfully without any additional mutation. Three mutant forms of hIFNα2b ORF were overexpressed in Escherichia coli BL21 (DE3) resulted in three muteins: hIFNα2b C2D, hIFNα2b C99D, hIFNα2b C2D C99D. To follow the kinetic and localization of the mutein interferon after intravenous administration, Tc99m was used to label the proteins. In particular of elimination half-life, it was shown that hIFNα2b C2D C99D > hIFNα2bC2D > hIFNα2bC99D > wild type. hIFNα2b C2D C99D mutein showed highest blood accumulation after 30 minutes administration. Taken together, the charge of hIFNα2b seems to be responsible for the fate of hIFNα2b in vivo.展开更多
目的:观察聚乙二醇化重组人改构白介素11(PEGylated IL-11 mutein,PEG-m IL 11)不同给药次数和给药剂量对骨髓抑制的小鼠血小板减少症的治疗作用,并与m IL-11进行比较,为临床应用提供参考。方法:BALB/c小鼠经2.5 Gy全身^(60)Coγ射线照...目的:观察聚乙二醇化重组人改构白介素11(PEGylated IL-11 mutein,PEG-m IL 11)不同给药次数和给药剂量对骨髓抑制的小鼠血小板减少症的治疗作用,并与m IL-11进行比较,为临床应用提供参考。方法:BALB/c小鼠经2.5 Gy全身^(60)Coγ射线照射后,腹腔注射50 mg/kg卡铂制备血小板减少症模型。在给药次数研究中,将30只造模成功的BALB/c小鼠随机分为5组:溶剂对照组:d 1,4,7每日1次,共3次;m IL-11组:m IL-11200μg/(kg·d)×9 d;PEG-m IL 11 A组:PEG-m IL 111800μg/(kg·d)×1 d(d 1);PEG-m IL 11 B组:900μg/(kg·d)×2 d(d 1,5)和PEG-m IL 11 C组:600μg/(kg·d)×3 d(d 1,4,7),各组小鼠均为皮下注射给药。监测5周内血小板的变化情况;在给药剂量研究中将100只造模成功的BALB/c小鼠随机分为5组:溶剂对照组:d 1,5每日1次,共2次;m IL-11组:m IL-11200μg/(kg·d)×9 d、PEG-m IL 11低、中、高剂量组(200、420、900μg/(kg·d)×2 d,d 1,5),对各组小鼠均皮下注射给药,在5周内每隔2-3 d检测外周血细胞,并于给药后d 8选取部分动物安乐死后进行骨髓细胞培养。结果:与造模前相比,溶剂对照组Plt在最低点时降低幅度达到80%以上。给药次数研究中,PEG-m IL 11各给药组在最低点时的Plt值均明显高于溶剂对照组和m IL-11组(P<0.05),但不同给药次数的3组间差异不显著;在给药剂量研究中,PEG-m IL 11各治疗组在Plt最低点的降低幅度明显低于溶剂对照组和m IL-11治疗组(P<0.05),在最低点后Plt的恢复速度明显快于溶剂对照组,在d 10呈剂量依赖性的升高(r=0.92);PEG-m IL 11各治疗组的RBC在最低点的降低幅度明显减小并且恢复明显加快;各组WBC的变化趋势基本一致。CFU-M eg测定结果显示,PEG-m IL 11和m IL-11组同溶剂对照比相比CFU-M eg有增多的趋势,且PEG-m IL 11治疗组动物的集落数更高。结论:PEG-m IL 11对骨髓抑制小鼠血小板减少症有明显的治疗作用,而且同m IL-11相比,可以减少给药次数,提高治疗的顺应性,为开发重组白介素11的长效制剂提供了一定的依据。展开更多
文摘Novel human interferon alpha 2b (hIFNα2b) muteins were developed by substituting cysteine residue (C) at positions 2 and 99 with aspartic acid residues (D). The mutein forms were then studied for pharmacokinetic profile. In addition, the influence of charge on the protein structure was tested in vivo for the biodistribution pattern. Codon substitutions were performed by Polymerase Chain Reaction (PCR)-based site-directed mutagenesis on a previously constructed synthetic hIFNα2b open reading frame (ORF) cloned in pET32b expression plasmid. The result of nucleotide sequencing analysis confirmed that all codons were replaced successfully without any additional mutation. Three mutant forms of hIFNα2b ORF were overexpressed in Escherichia coli BL21 (DE3) resulted in three muteins: hIFNα2b C2D, hIFNα2b C99D, hIFNα2b C2D C99D. To follow the kinetic and localization of the mutein interferon after intravenous administration, Tc99m was used to label the proteins. In particular of elimination half-life, it was shown that hIFNα2b C2D C99D > hIFNα2bC2D > hIFNα2bC99D > wild type. hIFNα2b C2D C99D mutein showed highest blood accumulation after 30 minutes administration. Taken together, the charge of hIFNα2b seems to be responsible for the fate of hIFNα2b in vivo.
文摘目的:观察聚乙二醇化重组人改构白介素11(PEGylated IL-11 mutein,PEG-m IL 11)不同给药次数和给药剂量对骨髓抑制的小鼠血小板减少症的治疗作用,并与m IL-11进行比较,为临床应用提供参考。方法:BALB/c小鼠经2.5 Gy全身^(60)Coγ射线照射后,腹腔注射50 mg/kg卡铂制备血小板减少症模型。在给药次数研究中,将30只造模成功的BALB/c小鼠随机分为5组:溶剂对照组:d 1,4,7每日1次,共3次;m IL-11组:m IL-11200μg/(kg·d)×9 d;PEG-m IL 11 A组:PEG-m IL 111800μg/(kg·d)×1 d(d 1);PEG-m IL 11 B组:900μg/(kg·d)×2 d(d 1,5)和PEG-m IL 11 C组:600μg/(kg·d)×3 d(d 1,4,7),各组小鼠均为皮下注射给药。监测5周内血小板的变化情况;在给药剂量研究中将100只造模成功的BALB/c小鼠随机分为5组:溶剂对照组:d 1,5每日1次,共2次;m IL-11组:m IL-11200μg/(kg·d)×9 d、PEG-m IL 11低、中、高剂量组(200、420、900μg/(kg·d)×2 d,d 1,5),对各组小鼠均皮下注射给药,在5周内每隔2-3 d检测外周血细胞,并于给药后d 8选取部分动物安乐死后进行骨髓细胞培养。结果:与造模前相比,溶剂对照组Plt在最低点时降低幅度达到80%以上。给药次数研究中,PEG-m IL 11各给药组在最低点时的Plt值均明显高于溶剂对照组和m IL-11组(P<0.05),但不同给药次数的3组间差异不显著;在给药剂量研究中,PEG-m IL 11各治疗组在Plt最低点的降低幅度明显低于溶剂对照组和m IL-11治疗组(P<0.05),在最低点后Plt的恢复速度明显快于溶剂对照组,在d 10呈剂量依赖性的升高(r=0.92);PEG-m IL 11各治疗组的RBC在最低点的降低幅度明显减小并且恢复明显加快;各组WBC的变化趋势基本一致。CFU-M eg测定结果显示,PEG-m IL 11和m IL-11组同溶剂对照比相比CFU-M eg有增多的趋势,且PEG-m IL 11治疗组动物的集落数更高。结论:PEG-m IL 11对骨髓抑制小鼠血小板减少症有明显的治疗作用,而且同m IL-11相比,可以减少给药次数,提高治疗的顺应性,为开发重组白介素11的长效制剂提供了一定的依据。
文摘SHP2 (Src homology 2 domain-containing protein tyrosine phosphatase-2)是由Ptpn11基因编码的非受体型蛋白酪氨酸磷酸酶,通过RAS (rat sarcoma)-ERK (extracellular regulated protein kinases)信号通路的活化调控细胞生长、分化和凋亡,并参与PD-1 (programmed cell death protein 1)/PD-L1(programmed cell death ligand 1)通路的免疫监控,已成为有突破意义的抗癌药物新靶标.靶向SHP2变构位点的抑制剂通过稳定SHP2非活性构象而抑制磷酸酶催化功能,具有很好的成药性.但是,SHP2功能获得性突变(gainoffunction,简称GOF)导致一系列发育障碍疾病和肿瘤的发生,并对SHP2野生型变构抑制剂产生耐药性.本工作首次以靶向SHP2激活突变体的变构抑制剂为靶头,基于PROTACs(proteolysis-targeting chimeras)技术,设计合成了一系列全新SHP2小分子降解剂.其中先导化合物3f和4d保持了对突变型SHP2^(E76A)的酶抑制活性,而且对于野生型SHP2依赖的人食管鳞癌细胞KYSE-520和突变型SHP2^(N58S)人大细胞肺癌细胞NCI-H661都显示强效抗增殖活性,比相应变构抑制剂的活性提高了5~10倍,为治疗SHP2突变或活化导致的遗传性疾病或肿瘤提供了新的干预策略.
