AIM To improve the treatment efficacy of anti tumor drug mitoxantrone, the conjugation of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies were prepared. METHODS Mitoxantrone loaded nanospheres ...AIM To improve the treatment efficacy of anti tumor drug mitoxantrone, the conjugation of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies were prepared. METHODS Mitoxantrone loaded nanospheres were prepared with emulsion heating solidification technique. A heterobifunctional reagent, N succinimidyl 3 (2 pyridyldithio) propionate (SPDP), was used as the crosslinker of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies; pharmaceutical properties of immunonanocapsuls were studied; the conjugates of nanospheres and monoclonal antibodies was confirmed with immunological methods such as slide agglutination test, fluorescent immunossay and rosset formation test, fluorescent staining and scanning electron microscope. RESULTS Mitoxantrone loaded nanospheres were spherical, with smooth surface and median diameter of 0 665 micron. When stored at 3-5, 20-25 and 37℃, RH 75% for three months, the appearance, morphology, size distribution, drug loading and in vitro release characteristics showed no significant change and the stability was satisfactory. The size analysis demonstrated that there was no obvious increase in the particle size of nanoparticles after conjugation. Immunological tests indicate highly selective binding of antibody targeted nanospheres to C erbB 2 overexpressing cells SK BR 3. CONCLUSION The conjugation of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies can keep the activity of anti C erbB 2 and increase the therapeutic efficacy of anti mammary cancer drugs.展开更多
目的 获得鼠抗人精浆蛋白 m Ab重链 Fd段基因 ,并将其转染到 He L a细胞进行表达 .方法 从分泌抗人精浆蛋白 m Ab的杂交瘤细胞系 E4 B7中提取总 RNA,用 RT- PCR法获取重链 Fd段 c DNA.将其克隆入真核表达载体 pc D-NA3,用脂质体转染...目的 获得鼠抗人精浆蛋白 m Ab重链 Fd段基因 ,并将其转染到 He L a细胞进行表达 .方法 从分泌抗人精浆蛋白 m Ab的杂交瘤细胞系 E4 B7中提取总 RNA,用 RT- PCR法获取重链 Fd段 c DNA.将其克隆入真核表达载体 pc D-NA3,用脂质体转染法转染 He L a细胞 ,并用免疫荧光染色方法检测重链 Fd段的表达 .结果 从分泌抗人精浆蛋白的鼠m Ab杂交瘤细胞系 E4 B7中克隆出了重链 Fd段基因 ,序列测定表明 ,VH 与鼠免疫球蛋白 MUSIGHAEI同源性最高 .将含重链 Fd段基因的真核表达载体 pc DNA3- E4 B7Fd中转染He L a细胞后 ,在 He L a细胞中检测到了重链 Fd段的表达 .结论 获得了序列正确的重链 Fd段基因 ,它在 He L a细胞中可以成功地表达 ,为进一步构建和表达 Fab奠定基础 .展开更多
文摘AIM To improve the treatment efficacy of anti tumor drug mitoxantrone, the conjugation of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies were prepared. METHODS Mitoxantrone loaded nanospheres were prepared with emulsion heating solidification technique. A heterobifunctional reagent, N succinimidyl 3 (2 pyridyldithio) propionate (SPDP), was used as the crosslinker of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies; pharmaceutical properties of immunonanocapsuls were studied; the conjugates of nanospheres and monoclonal antibodies was confirmed with immunological methods such as slide agglutination test, fluorescent immunossay and rosset formation test, fluorescent staining and scanning electron microscope. RESULTS Mitoxantrone loaded nanospheres were spherical, with smooth surface and median diameter of 0 665 micron. When stored at 3-5, 20-25 and 37℃, RH 75% for three months, the appearance, morphology, size distribution, drug loading and in vitro release characteristics showed no significant change and the stability was satisfactory. The size analysis demonstrated that there was no obvious increase in the particle size of nanoparticles after conjugation. Immunological tests indicate highly selective binding of antibody targeted nanospheres to C erbB 2 overexpressing cells SK BR 3. CONCLUSION The conjugation of mitoxantrone loaded nanospheres and anti C erbB 2 monoclonal antibodies can keep the activity of anti C erbB 2 and increase the therapeutic efficacy of anti mammary cancer drugs.
文摘目的 获得鼠抗人精浆蛋白 m Ab重链 Fd段基因 ,并将其转染到 He L a细胞进行表达 .方法 从分泌抗人精浆蛋白 m Ab的杂交瘤细胞系 E4 B7中提取总 RNA,用 RT- PCR法获取重链 Fd段 c DNA.将其克隆入真核表达载体 pc D-NA3,用脂质体转染法转染 He L a细胞 ,并用免疫荧光染色方法检测重链 Fd段的表达 .结果 从分泌抗人精浆蛋白的鼠m Ab杂交瘤细胞系 E4 B7中克隆出了重链 Fd段基因 ,序列测定表明 ,VH 与鼠免疫球蛋白 MUSIGHAEI同源性最高 .将含重链 Fd段基因的真核表达载体 pc DNA3- E4 B7Fd中转染He L a细胞后 ,在 He L a细胞中检测到了重链 Fd段的表达 .结论 获得了序列正确的重链 Fd段基因 ,它在 He L a细胞中可以成功地表达 ,为进一步构建和表达 Fab奠定基础 .
