Plasmonic SERS Au Nanosunflowers for Sensitive and Label-Free Diagnosis of DNA Base Damage in Stimulus-Induced Cell Apoptosis

Molecular diagnosis and accurate damage analysis of complex genomic DNAs in tumor cells are crucial to the theranostics of cancers but still a huge challenge. Herein, by designed preparation of a uniform plasmonic sunflower-like assembly gold (Au) nanostructure that is capable of efficient DNA captu...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2020-09, Vol.92 (17), p.11755-11762
Main Authors: Qi, Guohua, Wang, Dandan, Li, Chuanping, Ma, Kongshuo, Zhang, Ying, Jin, Yongdong
Format: Article
Language:English
Subjects:
Adenine
Analytical chemistry
Apoptosis
Biosensing Techniques - methods
Cancer
Chemistry
Damage assessment
Damage detection
Deoxyribonucleic acid
Diagnosis
DNA
DNA damage
DNA Damage - genetics
Genomic analysis
Gold - chemistry
Humans
Metal Nanoparticles - chemistry
Plasmonics
Precision medicine
Raman spectroscopy
Spectrum Analysis, Raman - methods
Sunflowers
Transcription
Tumor cells
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Summary:Molecular diagnosis and accurate damage analysis of complex genomic DNAs in tumor cells are crucial to the theranostics of cancers but still a huge challenge. Herein, by designed preparation of a uniform plasmonic sunflower-like assembly gold (Au) nanostructure that is capable of efficient DNA capture and providing high-density gap-plasmon “hot spots” for adequate surface-enhanced Raman spectroscopy (SERS) enhancement, we succeeded in sensitive and reliable label-free SERS detection of DNA damage in electrostimulus-induced apoptotic cancer cells at the DNA base level for the first time. The SERS results showed that the external electrostimulus (at 1.2 V, for 5 min) was almost harmless to normal healthy cells, but it caused pronounced double strand break and adenine base damage in cancer cell DNAs, which effectively destroyed the reproduction and transcription of DNAs and ultimately induced cell apoptosis. The developed sensing platform and method are promising for cell study of genetically related diseases.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.0c01799