Gp96, a member of HSP90 family, is a versatile molecular chaperone with various newly-discovered functions, for example to serve as a low affinity, high capacity calcium binding protein, a natural adjuvant for therape...Gp96, a member of HSP90 family, is a versatile molecular chaperone with various newly-discovered functions, for example to serve as a low affinity, high capacity calcium binding protein, a natural adjuvant for therapeutic cancer vaccines, a tumor rejection antigen, an immune regulator to pathological cell death. Its multi-functional and structural characteristics make it also an interesting target to develop antibody-based therapeutics. However, its low immunogenicity to mice, because of its high-sequence similarity among different species, is an obstacle to obtain valuable monoclonal antibodies (MAbs). This is a common problem for any low immunogenic proteins, whose sequences share close identity between mice and other species. Here, a new strategy of priming was employed by swine endogenous full-length gp96 and then boosting by E. coli-system heterologously expressed gp96 N-terminal fragment (N-355) to generate MAbs. Twelve different highly-specific MAbs against swine/human endogenous gp96 were successfully obtained. The binding activities of these MAbs were confirmed by enzyme-linked immunosorbent assay (ELISA), Western blot (WB), immunofluorescence and flow cytometry analysis. This provides some important reagents for further research and potential therapeutics. The methods employed can be used for MAb production of any sequence-highly-conserved proteins between mice and swine/human (or any other species).展开更多
Expression of opioid receptor-like receptor (ORL1)and its endogenous peptide agonist nociceptin/orphaninFo (N/OFQ) during mouse embryogenesis have been investigated. Transcripts of ORL1 and N/OFQ were detected by RT-P...Expression of opioid receptor-like receptor (ORL1)and its endogenous peptide agonist nociceptin/orphaninFo (N/OFQ) during mouse embryogenesis have been investigated. Transcripts of ORL1 and N/OFQ were detected by RT-PCR in mouse brain of day 8 embryo (E8)and the expression continued afterwards. Northern blotanalysis revealed abundant expression of ORL1 at postnatal day 1 (P1) and N/OFQ at E17 and P1 in the brain butnone was detected in other embryonic tissues. The presence of functional ORL1 in mouse embryonic brain wasalso confirmed by specific binding of [3H] N/OFQ (kd=1.3±0.5 nM and Bmax = 72±9 fmol/mg protein) as wellas by N/OFQ-stimulated G protein activation.展开更多
目的制备肿瘤干细胞标志性蛋白CD133的多克隆抗体,为进一步研究肿瘤组织中肿瘤干细胞的生物学特性以及筛选肿瘤干细胞、制备肿瘤干细胞的小鼠模型奠定基础。方法以人CD133蛋白细胞外膜表面肽段为抗原,免疫新西兰大白兔制备多克隆抗体,...目的制备肿瘤干细胞标志性蛋白CD133的多克隆抗体,为进一步研究肿瘤组织中肿瘤干细胞的生物学特性以及筛选肿瘤干细胞、制备肿瘤干细胞的小鼠模型奠定基础。方法以人CD133蛋白细胞外膜表面肽段为抗原,免疫新西兰大白兔制备多克隆抗体,进而用其对肿瘤组织进行Western blot以及免疫组化染色。结果 Western blot证实该抗体可以识别过表达的myc-CD133以及内源性CD133,进一步免疫组化结果显示该抗体可以识别恶性胶质瘤中的肿瘤干细胞。结论成功制备高效、特异的CD133多克隆抗体,该抗体可以用于肿瘤组织的免疫染色及肿瘤干细胞的筛选。展开更多
基金Project(31030030) supported by the National Natural Science Foundation of China
文摘Gp96, a member of HSP90 family, is a versatile molecular chaperone with various newly-discovered functions, for example to serve as a low affinity, high capacity calcium binding protein, a natural adjuvant for therapeutic cancer vaccines, a tumor rejection antigen, an immune regulator to pathological cell death. Its multi-functional and structural characteristics make it also an interesting target to develop antibody-based therapeutics. However, its low immunogenicity to mice, because of its high-sequence similarity among different species, is an obstacle to obtain valuable monoclonal antibodies (MAbs). This is a common problem for any low immunogenic proteins, whose sequences share close identity between mice and other species. Here, a new strategy of priming was employed by swine endogenous full-length gp96 and then boosting by E. coli-system heterologously expressed gp96 N-terminal fragment (N-355) to generate MAbs. Twelve different highly-specific MAbs against swine/human endogenous gp96 were successfully obtained. The binding activities of these MAbs were confirmed by enzyme-linked immunosorbent assay (ELISA), Western blot (WB), immunofluorescence and flow cytometry analysis. This provides some important reagents for further research and potential therapeutics. The methods employed can be used for MAb production of any sequence-highly-conserved proteins between mice and swine/human (or any other species).
文摘Expression of opioid receptor-like receptor (ORL1)and its endogenous peptide agonist nociceptin/orphaninFo (N/OFQ) during mouse embryogenesis have been investigated. Transcripts of ORL1 and N/OFQ were detected by RT-PCR in mouse brain of day 8 embryo (E8)and the expression continued afterwards. Northern blotanalysis revealed abundant expression of ORL1 at postnatal day 1 (P1) and N/OFQ at E17 and P1 in the brain butnone was detected in other embryonic tissues. The presence of functional ORL1 in mouse embryonic brain wasalso confirmed by specific binding of [3H] N/OFQ (kd=1.3±0.5 nM and Bmax = 72±9 fmol/mg protein) as wellas by N/OFQ-stimulated G protein activation.
文摘目的制备肿瘤干细胞标志性蛋白CD133的多克隆抗体,为进一步研究肿瘤组织中肿瘤干细胞的生物学特性以及筛选肿瘤干细胞、制备肿瘤干细胞的小鼠模型奠定基础。方法以人CD133蛋白细胞外膜表面肽段为抗原,免疫新西兰大白兔制备多克隆抗体,进而用其对肿瘤组织进行Western blot以及免疫组化染色。结果 Western blot证实该抗体可以识别过表达的myc-CD133以及内源性CD133,进一步免疫组化结果显示该抗体可以识别恶性胶质瘤中的肿瘤干细胞。结论成功制备高效、特异的CD133多克隆抗体,该抗体可以用于肿瘤组织的免疫染色及肿瘤干细胞的筛选。
