近红外荧光量子点对颊癌可视化活体成像研究

目的 观察用最大发射波长为800 nm近红外荧光量子点(quantum dots,QD800)标记的昆明小鼠鳞状细胞癌U14细胞在体内颊部的可视化成像情况,为癌症的早期诊断、可视化观察和个体化治疗提供依据.方法 用具有穿膜作用肽段连接的QD800通过内吞标记U14细胞(U14-QD800),将含有不同细胞数的U14-QD800分别注射于裸鼠和昆明小鼠颊部黏膜下,在不同时间行活体成像,观察用QD800标记对U14细胞非侵入体内检测的敏感性和动态成像情况.结果 活体成像对裸鼠和昆明小鼠颊部可视化检测到的最少U 14-QD800细胞数分别为1×104和1×105个.1×104、1×105和1×106个U14-QD800细胞在裸鼠颊部能可视化成像持续的时间分别为3、7和16 d,1×105和1×106个U14-QD800细胞在昆明小鼠颊部能可视化成像持续的时间分别为3和10 d.结论 由于近红外荧光量子点对组织具有强的穿透力,在癌症的早期诊断、可视化观察和个体化治疗方面具有较大的发展前景.

Abstract：

Objective To examine the in vivo visual imaging of buccal carcinoma with the nearinfrared fluorescent quantum dots. Methods The U14 cells were labeled by endocytosis with QD800 (U14/QD800) which was linked with cell-penetrating peptide. Different number of U14/QD800 was injected under the buccal mucosa of nude mice and Kunming mice separately and imaged at different time to detect the in vivo sensitivity and dynamic imaging of U14/QD800. Results The minimum number of U14/QD800 cells which could be detected by in vivo imaging system was 1 × 104 in nude mice's cheek and 1 × 105 in Kunming mice's. The time for visual imaging of 1 × 104, 1 × 105 and 1 × 106 U14/QD800 cells in nude mice was 3, 7 and 16 d separately, and 3 and 10 d separately in Kunming mice. Conclusions Due to its strong tissue penetration, near-infrared fluorescent quantum dots have great prospects in cancer early diagnosis, visual observation and individual treatment.

Visual imaging for buccal carcinoma with near-infrared fluorescent quantum dots in vivo

Objective To examine the in vivo visual imaging of buccal carcinoma with the nearinfrared fluorescent quantum dots. Methods The U14 cells were labeled by endocytosis with QD800 (U14/QD800) which was linked with cell-penetrating peptide. Different number of U14/QD800 was injected under the buccal mucosa of nude mice and Kunming mice separately and imaged at different time to detect the in vivo sensitivity and dynamic imaging of U14/QD800. Results The minimum number of U14/QD800 cells which could be detected by in vivo imaging system was 1 × 104 in nude mice's cheek and 1 × 105 in Kunming mice's. The time for visual imaging of 1 × 104, 1 × 105 and 1 × 106 U14/QD800 cells in nude mice was 3, 7 and 16 d separately, and 3 and 10 d separately in Kunming mice. Conclusions Due to its strong tissue penetration, near-infrared fluorescent quantum dots have great prospects in cancer early diagnosis, visual observation and individual treatment.