Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (12): 2742.doi: 10.7503/cjcu20200346

• Analytical Chemistry • Previous Articles     Next Articles

Detection of Nitroreductase in Living Cells Based on Surface Enhanced Raman Scattering Nanoprobes

ZHENG Youwei, TIAN Fei, ZHANG Qian, XU Di, YANG Guohai, QU Lulu()   

  1. School of Chemistry and Materials Science,Jiangsu Normal University,Xuzhou 221116,China
  • Received:2020-06-11 Online:2020-12-10 Published:2020-12-09
  • Contact: QU Lulu E-mail:luluqu@jsnu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21974055)

Abstract:

The expression of nitroreductase(NTR) is closely related to the degree of hypoxic in anoxic tumor cell. Therefore, the development of a highly selective method for the detection of NTR is of great significance for the diagnosis and treatment of cancer. We functionalized p-NTP onto the surface of Au NPs to prepare a highly sensitive SERS probe. Under hypoxic conditions, the reduced nicotinamide adenine dinucleotide(NADH) is used as an electron donor, and NTR can catalyze the reduction of a nitroaromatic compound to an aromatic amine, which results in the SERS spectrum change of the nanoprobe, thus realizing the detection of NTR. The detection limit of the nanoprobe for NTR can reach 18 ng/mL. The probe exhibits low toxicity and good biocompatibility. It can be used for SERS analysis of A549 cells under hypoxia conditions and reveals that the concentration of nitroreductase in tumor cells increases with the increase of hypoxia degree, which provides an effective strategy for evaluating hypoxia in tumor cells.

Key words: Hypoxic, Nitroreductase, Highly selectivity, Cell

CLC Number: 

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