Renal Clearable New NIR Probe: Precise Quantification of Albumin in Biofluids and Fatty Liver Disease State Identification through Tissue Specific High Contrast Imaging in Vivo
作者:Gourab Dey、Vikas Singh、Jayant Dewangan、P. Vineeth Daniel、Mohan Kamthan、Debabrata Ghosh、Prosenjit Mondal、Subrata Ghosh
DOI:10.1021/acs.analchem.7b02187
日期:2017.10.3
Development of a highly photostable, renal clearable, and nontoxic new NIR probe (CyG) for precise quantification of albumin in different biofluids and liver targeted in vivo albumin visualization is demonstrated. CyG’s inherent property to interact selectively with albumin among different biomolecules in intracellular environment with high degree of sensitivity helps CyG in targeted liver imaging. In addition to its long excitation/emission wavelengths (λex = 740 nm, λem = 804 nm), which are much above the biological tissue opaque window (400–700 nm) ensuring better photon penetration, diminished tissue autofluorescence and high contrasts, its molecular mass and size are far below the renal cutoff and hence, CyG qualifies as imaging material for clinical studies. We anticipate that CyG will provide new strategies to overcome the pitfall of present day albumin detection methods as well as accelerate the detection process at relatively lower costs without compromising the accuracy of detection. Moreover, the renal excretion kinetic and intrahepatic albumin binding affinity of CyG can further be used to differentiate between fatty liver from healthy liver in an experimentally arrived mouse model using noninvasive technique.
该研究展示了一种高光稳定性、肾脏可清除且无毒的新型近红外探针(CyG),可用于精确定量不同生物流体中的白蛋白以及肝脏靶向体内白蛋白显像。CyG 具有选择性地与细胞内环境中不同生物大分子中的白蛋白相互作用的固有特性,灵敏度高,这有助于 CyG 在肝脏靶向成像中发挥作用。CyG 的激发/发射波长较长(λex = 740 nm,λem = 804 nm),远高于生物组织的不透明窗口(400-700 nm),确保了更好的光子穿透性,减少了组织自发荧光,对比度高,此外,其分子质量和大小也远低于肾脏的临界值,因此,CyG 有资格作为成像材料用于临床研究。我们预计,CyG 将为克服目前白蛋白检测方法的缺陷提供新的策略,并以相对较低的成本加速检测过程,同时不影响检测的准确性。此外,CyG 的肾脏排泄动力学和肝内白蛋白结合亲和力可进一步用于在实验小鼠模型中使用无创技术区分脂肪肝和健康肝脏。