Abstract
An ultra-sensitive method is described here for the determination of HIF-1α (an early biomarker for myocardial infarction) in circulating exosomes in serum. Gold nanospheres were functionalized with a HIF-1α-binding aptamer via sulfydryl chemistry. The apt-AuNP-coated gold seeds were grown by seed-mediated growth, and this significantly increased the peroxidase-mimicking property the nanoparticles. A chromogenic system composed of 3,3′5,5′-tetramethylbenzidine and hydrogen peroxide was used. Absorbance at 652 nm increases linearly in the 0.3 to 200 ng L−1 HIF-1α concentration range, and the limit of detection is 0.2 ng L−1. The method was tested by analyzing rat serum from isoproterenol (ISO)-induced myocardial infarction. It allows HIF-1α to be directly determined in a 25 μL sample without preconcentration. The assay is not interfered by the polydispersity of exosomes released under either health and disease conditions.
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Abbreviations
- CVDs:
-
Cardiovascular diseases
- MI:
-
Myocardial infarction
- cTn:
-
Cardiac troponin
- LDH:
-
Lactate dehydrogenase
- CK-MB:
-
Creatine kinase MB
- HIF-1α:
-
Hypoxia-inducible factor-1 alpha
- HRP:
-
Horseradish peroxidase
- ISEV:
-
International Society for Extracellular Vesicles
- AuNPs:
-
Gold nanoparticles
- LOD:
-
Limit of detection
- NTA:
-
Nanoparticle tracking analysis
- DLS:
-
Dynamic light scattering
- TEM:
-
Transmission electron microscope
- CV:
-
Coefficient of variation
- ISO:
-
Isoproterenol hydrochloride
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Acknowledgements
CAS “Light of West China” Program (No. 2018XBZG_XBQNXZ_A_005), Biological Resources Program, Chinese Academy of Sciences (KFJ-BRP-008)
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Wang, QL., Huang, WX., Zhang, PJ. et al. Colorimetric determination of the early biomarker hypoxia-inducible factor-1 alpha (HIF-1α) in circulating exosomes by using a gold seed-coated with aptamer-functionalized Au@Au core-shell peroxidase mimic. Microchim Acta 187, 61 (2020). https://doi.org/10.1007/s00604-019-4035-z
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DOI: https://doi.org/10.1007/s00604-019-4035-z