Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (2): 609-615.doi: 10.1007/s40242-021-1173-8

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A Long-wavelength Emissive Phenothiazine Derived Fluorescent Probe for Detecting HOCl Upregulation in 5-FU Stimulated Living Cells

WANG Bingya1, GUO Xiaomei2, LIU Zuodong3, WU Yongquan2, HOU Ji-Ting1   

  1. 1. College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, P. R. China;
    2. School of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, P. R. China;
    3. Henan Key Laboratory of Utilization of Non-metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang 464000, P. R. China
  • Received:2021-04-14 Revised:2021-06-07 Online:2022-04-01 Published:2022-05-18
  • Contact: WU Yongquan, HOU Ji-Ting E-mail:wyq@gnnu.edu.cn;houjiting2206@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(No.21807029), the Double-Thousand Talents Plan of Jiangxi Province, China(2019), and the Nanhu Scholars Program for Young Scholars of Xinyang Normal University, China. The authors also thanked for the help from the Analysis & Testing Center of Xinyang Normal University, China.

Abstract: The endogenous hypochlorous acid(HOCl) has been evidenced in a variety of cellular courses. However, the role of HOCl in most pathophysiological processes still keeps unclear because of the limited detecting tools. In this work, we presented the pre- paration of a phenothiazine-derived fluorescent probe ClO-1 for HOCl detection with a cyanopyridinium moiety to improve its water solubility and lengthen its emission wavelength. The HOCl-promoted oxidation of sulfur atom in the probe resulted in a 460-fold emission intensity enhancement at 635 nm with high selectivity and sensitivity(detection limit: 1.12 nmol/L). The rapid response(5 s) also endowed the probe with real-time detection ability. Successfully, ClO-1 was devoted to the bioimaging of endogenous HOCl in inflamed RAW 264.7 cells and 5-fluorouracil-treated MCF-7 cells.

Key words: Fluorescent probe, Phenothiazine, Hypochlorous acid, 5-Fluorouracil, Bioimaging