Abstract
Tyramide signal amplification (or catalyzed-reporter deposition) is an analyte-dependent reporter enzyme method that enhances the detection sensitivity of any given antigen by catalyzing the deposit of labeled tyramide that is covalently bound near the target molecule, providing high-density signal. Current methods allow identification of any protein or RNA using antibodies or probes, respectively. This technique has also been validated for electron microscopy detection by either DAB or for gold-conjugated streptavidin staining. Both techniques present several limitations, DAB staining hampers the ultrastructure of the sample since it precipitates all over the cell. Streptavidin, on the other hand, requires a strong permeabilization protocol which also compromises sample integrity. Hereby, we present a methodology which uses TSA in combination with immunogold labeling to improve the detection sensitivity for antigens that cannot be detected by conventional immunogold methods, or whose label is weak compared to background noise. As a proof of concept, we show the effectiveness of this technique for detecting difficult antigens expressed in the central nervous system such as NG2, PDGFRa, or BCAS1.
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Acknowledgments
We acknowledge the electron microscopy service at the Centro de Investigación Príncipe Felipe (Mario Soriano-Navarro) for their valuable help. This study was funded by the Nano-scaffolding for neuronal migration and generation project (PCI2018-093062) granted by the Spanish Ministry of Science, Innovation and Universities to VHP, Red de Terapia Celular (TerCel-RD16/0011/0026) to JMGV, and the Valencian Council for Innovation, Universities Science and Digital Society (PROMETEO/2019/075) granted to JMGV. MJUN was supported by a McDonald Fellowship from the Multiple Sclerosis International Federation. The authors declare that they have no conflict of interest.
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Ulloa-Navas, M.J., García-Tárraga, P., González-Granero, S., Pérez-Borreda, P., Herranz-Pérez, V., García-Verdugo, J.M. (2021). Tyramide Signal Amplification for Immunoelectron Microscopy. In: Lujan, R., Ciruela, F. (eds) Receptor and Ion Channel Detection in the Brain. Neuromethods, vol 169. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-1522-5_16
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DOI: https://doi.org/10.1007/978-1-0716-1522-5_16
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