Abstract
A multiplexed graphene oxide (GO) fluorescent nanoprobe is described for quantification and imaging of messenger RNAs (mRNAs) in living cells. The recognizing oligonucleotides (with sequences complementary to those of target mRNAs) were labeled with different fluorescent dyes. If adsorbed on GO, the fluorescence of the recognizing oligonucleotides is quenched. After having penetrated living cells, the oligonucleotides bind to target mRNAs and dissociate from GO. This leads to the recovery of fluorescence. Using different fluorescent dyes, various intracellular mRNAs can be simultaneously imaged and quantified by a high content analysis within a short period of time. Actin mRNA acts as the internal control. This GO-based nanoprobe allows mRNA mimics to be determined within an analytical range from 1 to 400 nM and a detection limit as low as 0.26 nM. Up to 3 intracellular mRNAs (C-myc, TK1, and actin) can be detected simultaneously in a single living cell. Hence, this nanoprobe enables specific distinction of intracellular mRNA expression levels in cancerous and normal cells. It can be potentially applied as a tool for detection of cancer progression and diagnosis.
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Acknowledgements
We are grateful for financial support from the National Natural Science Foundation of China (81502589, 81802104), the Natural Science Foundation of Guangdong Province, China (2014A030310481, 2018A030310229), the Medical Science and Technology Research Foundation of Guangdong Province, China (A2017448), the Science and Technology Project of Shenzhen (CXZZ20130515092016300, JCYJ20160422142707177, JCYJ20170306093259065), the Department of Education of Guangdong Province (2017KQNCX069), and the Department of Education, Guangdong Government under the Top-tier University Development Scheme for Research and Control of Infectious Diseases.
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Jiang, H., Li, FR., Li, W. et al. Multiplexed determination of intracellular messenger RNA by using a graphene oxide nanoprobe modified with target-recognizing fluorescent oligonucleotides. Microchim Acta 185, 552 (2018). https://doi.org/10.1007/s00604-018-3090-1
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DOI: https://doi.org/10.1007/s00604-018-3090-1