Download MendeleyFirst-generation species-selective chemical probes for fluorescence imaging of human senescence-associated beta-galactosidase.
Li, X., Qiu, W., Li, J., Chen, X., Hu, Y., Gao, Y., Shi, D., Li, X., Lin, H., Hu, Z., Dong, G., Sheng, C., Jiang, B., Xia, C., Kim, C.Y., Guo, Y., Li, J.(2020) Chem Sci 11: 7292-7301
- PubMed: 34123013
- DOI: https://doi.org/10.1039/d0sc01234c
- Primary Citation of Related Structures:
6KUZ - PubMed Abstract:
Human senescence-associated β-galactosidase (SA-β-gal), the most widely used biomarker of aging, is a valuable tool for assessing the extent of cell 'healthy aging' and potentially predicting the health life span of an individual. Human SA-β-gal is an endogenous lysosomal enzyme expressed from GLB1 , the catalytic domain of which is very different from that of E. coli β-gal, a bacterial enzyme encoded by lacZ . However, existing chemical probes for this marker still lack the ability to distinguish human SA-β-gal from β-gal of other species, such as bacterial β-gal, which can yield false positive signals. Here, we show a molecular design strategy to construct fluorescent probes with the above ability with the aid of structure-based steric hindrance adjustment catering to different enzyme pockets. The resulting probes normally work as traditional SA-β-gal probes, but they are unique in their powerful ability to distinguish human SA-β-gal from E. coli β-gal, thus achieving species-selective visualization of human SA-β-gal for the first time. NIR-emitting fluorescent probe KSL11 as their representative further displays excellent species-selective recognition performance in biological systems, which has been herein verified by testing in senescent cells, in lacZ -transfected cells and in E. coli -β-gal-contaminated tissue sections of mice. Because of our probes, it was also discovered that SA-β-gal content in mice increased gradually with age and SA-β-gal accumulated most in the kidneys among the main organs of naturally aging mice, suggesting that the kidneys are the organs with the most severe aging during natural aging.
- State Key Laboratory of Bioreactor Engineering, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology Shanghai 200237 China jianli@ecust.edu.cn.
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