目的人精子蛋白17(human sperm protein 17,Sp17)异常表达在一些恶性肿瘤细胞,可被用作肿瘤特异性分子诊断和治疗的靶点。文中将抗Sp17单克隆抗体与近红外染料偶联,制成高亲和力探针,用近红外成像技术对活体动物肿瘤靶点进行确认。方法...目的人精子蛋白17(human sperm protein 17,Sp17)异常表达在一些恶性肿瘤细胞,可被用作肿瘤特异性分子诊断和治疗的靶点。文中将抗Sp17单克隆抗体与近红外染料偶联,制成高亲和力探针,用近红外成像技术对活体动物肿瘤靶点进行确认。方法用免疫组化技术证明,Sp17在肝细胞癌细胞系SMMC-7721及裸鼠皮下移植瘤组织高水平异常表达。将近红外染料吲哚花箐素衍生物(ICG-Der-02)与抗Sp17单克隆抗体(anti-Sp17 mAb)偶联,获得特异性探针。静脉注射至荷瘤小鼠体内,用光学成像系统进行活体实时肿瘤显像。结果 anti-Sp17-ICG-Der-02探针进入动物体内后,快速聚集到肿瘤部位,发出强烈的荧光信号。随着未结合染料逐渐排出体外,动物肝、肾等内脏器官的非特异荧光信号消褪,清晰显示出肿瘤的部位及大小,且可以持续至少7d。结论高亲和力探针anti-Sp17-ICG-Der-02对体内肿瘤特异性诊断有潜在应用价值。展开更多
A new facile method for preparing water-soluble near-infrared （NIR）-emitting PbS quantum dots （QDs） is proposed by using N-acetyl-L-cysteine （NAC, a derivate of L-cysteine） as its stabilizer. The influence of th...A new facile method for preparing water-soluble near-infrared （NIR）-emitting PbS quantum dots （QDs） is proposed by using N-acetyl-L-cysteine （NAC, a derivate of L-cysteine） as its stabilizer. The influence of the precursor Pb/S molar ratio, the Pb/NAC molar ratio, and the pH of original solution on optical properties is explored. Results show that aqueous PbS QDs with strong NIR fluorescence can be prepared and their photoluminescence emission peaks can be tuned from 895 nm to 970 nm. Studies indicate that such aqueous QDs have a potential application in biomedical imaging, especially in noninvasive in vivo fluorescence imaging. In addition, the resulting PbS QDs are further characterized by a transmission electron microscopy and X-ray diffraction analysis.展开更多
基金Supported by the National Natural Science Foundation of China (30800257,30700799)the Scien-tific Research Starting Foundation for Introduced Talented Persons of China Pharmaceutical University~~
文摘A new facile method for preparing water-soluble near-infrared （NIR）-emitting PbS quantum dots （QDs） is proposed by using N-acetyl-L-cysteine （NAC, a derivate of L-cysteine） as its stabilizer. The influence of the precursor Pb/S molar ratio, the Pb/NAC molar ratio, and the pH of original solution on optical properties is explored. Results show that aqueous PbS QDs with strong NIR fluorescence can be prepared and their photoluminescence emission peaks can be tuned from 895 nm to 970 nm. Studies indicate that such aqueous QDs have a potential application in biomedical imaging, especially in noninvasive in vivo fluorescence imaging. In addition, the resulting PbS QDs are further characterized by a transmission electron microscopy and X-ray diffraction analysis.
