In this study,N-terminal site-specific mono-PEGylation of the recombinant lidamycin apoprotein(r LDP) of lidamycin(LDM) was prepared using a polyethyleneglycol(PEG) derivative(Mw20 k Da) through a reactive terminal al...In this study,N-terminal site-specific mono-PEGylation of the recombinant lidamycin apoprotein(r LDP) of lidamycin(LDM) was prepared using a polyethyleneglycol(PEG) derivative(Mw20 k Da) through a reactive terminal aldehyde group under weak acidic conditions(p H 5.5).The biochemical properties of m PEG-r LDP-AE,an enediyne-integrated conjugate,were analyzed by SDSPAGE,RP-HPLC,SEC-HPLC and MALDI-TOF.Meanwhile,in vitro and in vivo antitumor activity of m PEG-r LDP-AE was evaluated by MTT assays and in xenograft model.The results indicated that m PEGr LDP-AE showed significant antitumor activity both in vitro and in vivo.After PEGylation,m PEG-r LDP still retained the binding capability to the enediyne AE and presented the physicochemical characteristics similar to that of native LDP.It is of interest that the PEGylation did not diminish the antitumor efficacy of LDM,implying the possibility that this derivative may function as a payload to deliver novel tumortargeted drugs.展开更多
目的用马来酰亚胺活化的相对分子质量40000的聚乙二醇(MAL-PEG40K)定点修饰胰高血糖素样肽-1衍生物(glucagon like peptide-1analogue,GLP-1a),并分析修饰产物部分性质。方法采用MAL-PEG40K定点修饰GLP-1a,强阳离子交换层析分离纯化修...目的用马来酰亚胺活化的相对分子质量40000的聚乙二醇(MAL-PEG40K)定点修饰胰高血糖素样肽-1衍生物(glucagon like peptide-1analogue,GLP-1a),并分析修饰产物部分性质。方法采用MAL-PEG40K定点修饰GLP-1a,强阳离子交换层析分离纯化修饰混合物,SDS-PAGE及反相高压液相色谱法(RP-HPLC)检测修饰产物MAL-PEG40KGLP-1a纯度,报告基因法检测其体外活性,动物急性降血糖试验检测其体内生物学活性。结果MAL-PEG40K-GLP-1a经SDS-PAGE及RP-HPLC分析,纯度分别为95%和98.1%,体外活性保留率为22.9%,体内具有显著降血糖作用且药效时间明显延长。结论制备的MAL-PEG40K-GLP-1a药学性质获得显著改善,有望开发为安全、长效的新型GLP-1受体激动剂。展开更多
基金supported by the National Science and Technology Major Project for Major New Drug Innovation (Nos.2013ZX09102064 and 2014ZX09201042-003)
文摘In this study,N-terminal site-specific mono-PEGylation of the recombinant lidamycin apoprotein(r LDP) of lidamycin(LDM) was prepared using a polyethyleneglycol(PEG) derivative(Mw20 k Da) through a reactive terminal aldehyde group under weak acidic conditions(p H 5.5).The biochemical properties of m PEG-r LDP-AE,an enediyne-integrated conjugate,were analyzed by SDSPAGE,RP-HPLC,SEC-HPLC and MALDI-TOF.Meanwhile,in vitro and in vivo antitumor activity of m PEG-r LDP-AE was evaluated by MTT assays and in xenograft model.The results indicated that m PEGr LDP-AE showed significant antitumor activity both in vitro and in vivo.After PEGylation,m PEG-r LDP still retained the binding capability to the enediyne AE and presented the physicochemical characteristics similar to that of native LDP.It is of interest that the PEGylation did not diminish the antitumor efficacy of LDM,implying the possibility that this derivative may function as a payload to deliver novel tumortargeted drugs.
文摘目的用马来酰亚胺活化的相对分子质量40000的聚乙二醇(MAL-PEG40K)定点修饰胰高血糖素样肽-1衍生物(glucagon like peptide-1analogue,GLP-1a),并分析修饰产物部分性质。方法采用MAL-PEG40K定点修饰GLP-1a,强阳离子交换层析分离纯化修饰混合物,SDS-PAGE及反相高压液相色谱法(RP-HPLC)检测修饰产物MAL-PEG40KGLP-1a纯度,报告基因法检测其体外活性,动物急性降血糖试验检测其体内生物学活性。结果MAL-PEG40K-GLP-1a经SDS-PAGE及RP-HPLC分析,纯度分别为95%和98.1%,体外活性保留率为22.9%,体内具有显著降血糖作用且药效时间明显延长。结论制备的MAL-PEG40K-GLP-1a药学性质获得显著改善,有望开发为安全、长效的新型GLP-1受体激动剂。
