A simple method is described for high-resolution light and electron microscopic immunolocalization of proteins in cells and tissues by immunofluorescence and subsequent photooxidation of diaminobenzidine tetrahydrochloride into an insoluble osmiophilic polymer. By using eosin as the fluorescent marker, a substantial improvement in sensitivity is achieved in the photooxidation process over other conventional fluorescent compounds. The technique allows for precise correlative immunolocalization studies on the same sample using fluorescence, transmitted light and electron microscopy. Furthermore, because eosin is smaller in size than other conventional markers, this method results in improved penetration of labeling reagents compared to gold or enzyme based procedures. The improved penetration allows for three-dimensional immunolocalization using high voltage electron microscopy. Fluorescence photooxidation can also be used for high resolution light and electron microscopic localization of specific nucleic acid sequences by in situ hybridization utilizing biotinylated probes followed by an eosin-streptavidin conjugate.
Fluorescence photooxidation with eosin: a method for high resolution immunolocalization and in situ hybridization detection for light and electron microscopy
T. Deerinck,M. Martone,V. Lev-Ram,D. Green,R. Tsien,D. Spector,S. Huang,Mark Ellisman
Published 1994 in Journal of Cell Biology
ABSTRACT
PUBLICATION RECORD
- Publication year
1994
- Venue
Journal of Cell Biology
- Publication date
1994-08-02
- Fields of study
Biology, Medicine, Chemistry
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- biotinylated probes
Biotin-tagged nucleic acid probes used to detect target sequences in hybridization assays.
- correlative immunolocalization
A same-sample localization workflow that combines fluorescence, transmitted light, and electron microscopy for labeled proteins.
- diaminobenzidine tetrahydrochloride
The chromogen oxidized into an insoluble osmiophilic polymer during photooxidation.
- eosin
A fluorescent dye used as the marker to drive photooxidation in this protocol.
- eosin-streptavidin conjugate
A streptavidin-linked eosin label used after biotinylated probes in hybridization detection.
- fluorescence photooxidation
A fluorescence-driven oxidation method that converts diaminobenzidine tetrahydrochloride into an insoluble osmiophilic polymer for microscopic visualization.
- high voltage electron microscopy
An electron microscopy modality used for three-dimensional imaging of heavily labeled samples.
- in situ hybridization
A nucleic acid detection method applied here to localize specific sequences in cells and tissues.
REFERENCES
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