pH-Switched Near-Infrared Fluorescent Strategy for Ratiometric Detection of ONOO<sup>–</sup> in Lysosomes and Precise Imaging of Oxidative Stress in Rheumatoid Arthritis
作者:Wenjuan Chen、Haihong Liu、Fuxiang Song、Liantao Xin、Qian Zhang、Peng Zhang、Caifeng Ding
DOI:10.1021/acs.analchem.2c04175
日期:——
Rheumatoid arthritis (RA) is well-known as a kind of autoimmune disease, which brings unbearable pain to the patients by multiple organ complications besides arthritis. To date, RA can be hardly cured, but early diagnosis and standard treatment can relieve symptoms and pain. Therefore, an effective tool to assist the early diagnosis of RA deserves considerable attention. On account of the overexpressed ONOO– during the early stage of RA, a near-infrared (NIR) receptor, Lyso-Cy, is proposed in this work by linker chemistry to expand the conjugated rhodamine framework by cyanine groups. Contributed by the pH-sensitive spiral ring in rhodamine, receptor Lyso-Cy has been found to be workable in lysosomes specifically, which was confirmed by the pH-dependent spectra with a narrow responding region and a well-calculated pKa value of 5.81. We presented an excellent ratiometric sensing protocol for ONOO– in an acidic environment, which was also available for targeting ONOO– in lysosomes selectively. This innovative dual-targeting responsive design is expected to be promising for assisting RA diagnosis at an early stage with respect to the joint inflammatory model established in this work at the organism level.
类风湿性关节炎(RA)是一种众所周知的自身免疫性疾病,除了关节炎外,还会引发多种器官并发症,给患者带来难以忍受的痛苦。迄今为止,RA几乎无法治愈,但早期诊断和标准治疗可以缓解症状和疼痛。因此,一种有助于RA早期诊断的有效工具值得引起人们的广泛关注。考虑到RA早期阶段ONOO的过度表达,本文通过连接化学将一种近红外(NIR)受体Lyso-Cy与罗丹明结合,通过罗丹明中的pH敏感螺旋环,发现受体Lyso-Cy在溶酶体中是可行的,这通过pH依赖性光谱得到了证实,该光谱具有狭窄的响应区域和计算良好的pKa值5.81。我们提出了一种在酸性环境中检测ONOO的比率传感方案,该方案也可以选择性地靶向溶酶体中的ONOO。这种创新的双靶向响应设计有望在早期阶段协助RA诊断,这与本文在生物体水平上建立的关节炎症模型有关。