Department of Orthopaedics, The First Affiliated Hospital of SooChow University, Suzhou, Jiangsu, China.
Institute of Sports Medicine of Fudan University, Department of Orthopaedic Sports Medicine, Huashan Hospital, Fudan University, Shanghai 200040, China.
Nanoscale. 2020 Nov 12;12(43):22022-22029. doi: 10.1039/d0nr06261h.
Bone plays an increasingly critical role in human health and disease. More noninvasive multi-scale imaging techniques are urgently required for investigations on the substructures and biological functions of bones. Our results firstly revealed that SWIR QDs prepared by us acted as a bone-specific imaging contrast to achieve real-time observation of bone structures both in vivo and ex vivo. The major bone structures of both Balb/C nude mice and Balb/C mice including their skull, spine, pelvis, limbs, and sternum could be rapidly and gradually identified via blood circulation after QD injection in vivo. More importantly, the binding capability of our QDs mainly depended on the biological activities of bone tissues, suggesting that our technique is suitable for in vivo live imaging. In addition, the cell imaging results suggested that the potential mechanism of our bone imaging could be ascribed to the highly specific interaction between QDs and MC3T3-E1 cells. In a word, the skeletal structures and biological activities of bones are anticipated to be observed and monitored with this QD-guided SWIR imaging strategy, respectively. This radiation-free QD-guided SWIR live imaging of bone can add new insights into a comprehensive study of bones in vivo and provide a basis for early diagnosis of bone diseases.
骨骼在人类健康和疾病中起着越来越重要的作用。为了研究骨骼的亚结构和生物学功能,迫切需要更多的非侵入性多尺度成像技术。我们的研究结果首次揭示,我们制备的 SWIR QD 可作为一种骨骼特异性成像对比剂,实现骨骼结构的实时体内和体外观察。通过体内注射 QD 后,Balb/C 裸鼠和 Balb/C 小鼠的主要骨骼结构,包括颅骨、脊柱、骨盆、四肢和胸骨,能够快速且逐渐地通过血液循环被识别。更为重要的是,我们的 QD 的结合能力主要取决于骨组织的生物学活性,表明我们的技术适用于体内活体成像。此外,细胞成像结果表明,我们的骨骼成像的潜在机制可能归因于 QD 与 MC3T3-E1 细胞之间的高度特异性相互作用。总之,预计可以利用这种基于 QD 的 SWIR 成像策略来分别观察和监测骨骼的结构和生物学活性。这种无辐射的 QD 引导的骨骼 SWIR 活体成像可以为深入研究体内骨骼提供新的视角,并为骨疾病的早期诊断提供依据。
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