Dual-Modality Imaging Probes with High Magnetic Relaxivity and Near-Infrared Fluorescence Based Highly Aminated Mesoporous Silica Nanoparticles

作者：Zhu Fei-Peng; Chen Guo-Tao; Wang Shou-Ju; Liu Ying; Tang Yu-Xia; Tian Ying; Wang Jian-Dong; Wang Chun-Yan; Wang Xin; Sun Jing; Teng Zhao-Gang^*; Lu Guang-Ming^*

来源：Journal of Nanomaterials, 2016, 2016: 6502127.

DOI：10.1155/2016/6502127

• MICROBUBBLES
• NANOSPHERES

Dual-modal imaging by combining magnetic resonance (MR) and near-infrared (NIR) fluorescence can integrate the advantages of high-resolution anatomical imaging with high sensitivity in vivo fluorescent imaging, which is expected to play a significant role in biomedical researches. Here we report a dual-modality imaging probe (NIR/MR-MSNs) fabricated by conjugating NIR fluorescent heptamethine dyes (IR-808) and MR contrast agents (Gd-DTPA) within highly aminated mesoporous silica nanoparticles (MSNs-NH2). The dual-modality imaging probes NIR/MR-MSNs possess a size of ca. 120 nm. The NIR/MR-MSNs show not only near-infrared fluorescence imaging property with an emission peak at 794 nm, but also highly MR T-1 relaxivity of 14.54 mM(-1) s(-1), which is three times more than Gd-DTPA. In vitro experiment reveals high uptake and retention abilities of the nanoprobes, while cell viability assay demonstrates excellent cytocompatibility of the dual-modality imaging probe. After intratumor injection with the NIR/MR-MSNs, MR imaging shows clear anatomical border of the enhanced tumor region while NIR fluorescence exhibits high sensitive tumor detection ability. These intriguing features suggest that this newly developed dual-modality imaging probes have great potential in biomedical imaging.

• 出版日期2016
• 单位南京大学; 南京医科大学