Method for staining tissue
Provided is a method for staining a tissue enabling highly precise staining, by which the expression amount and/or the location of a biological substance in a tissue sample can be detected with a high quantitativity together with detailed information that can be obtained by bright field observation. The tissue staining method of the present invention is a method for staining a tissue, in which both staining that allows bright field observation and fluorescence staining are carried out for the same specific biological substance.
1. A method for staining a tissue section, comprising:
treating a tissue section with a biotinylated antibody wherein the biotinylated antibody directly or indirectly binds to a specific biological substance;
treating the tissue section with an avidinylated or streptavidinylated label for a bright field observation of the specific biological substance, wherein the avidinylated or streptavidinylated label binds to the biotinylated antibody;
treating the tissue section with a biotinylated fluorescent label for the specific biological substance, wherein the biotinylated fluorescent label binds to the avidinylated or streptavidinylated label; and
observing a pigmentation of the avidinylated or streptavidinylated label for the bright field observation on the tissue section and quantitatively observing bright spots of the biotinylated fluorescent label with general-purpose fluorescent microscope to identify a localization and an expression amount of the specific biological substance,
wherein the specific biological substance is a protein,
wherein the biotinylated fluorescent label comprises particles, and each of the particles comprises fluorescent substances selected from the group consisting of organic fluorescent dyes and semiconductor nanoparticles that have been aggregated to form the particles,
wherein the fluorescent substances are aggregated such that the fluorescent substance is inside or on the surface of each of the particles,
wherein an average particle size of the particles is 50 to 200 nm.
2. The method for staining the tissue section according to claim 1 , wherein diaminobenzidine is used as a substrate with the avidinylated or streptavddinylated label for the bright field observation, and. the biotinylated fluorescent label has an excitation wavelength of 450 to 700 nm.
3. The method for staining the tissue section accordng to claim 1 ,
wherein the biotinylated fluorescent label comprises a core-shell structure particle or a phosphor-containing nanoparticle,
wherein the core-shell structure particle has a core and a shell on the core, the shell comprising the fluorescent substances immobilized on the core, and
wherein the phosphor-containing nanoparticle comprises a base material and the fluorescent substances.
4. The method for staining the tissue section according to claim 1 , wherein a coefficient of variation of the particle size is 20% or less.
5. The method for staining the tissue section according to claim 1 ,
wherein the biotinylated fluorescent label comprises a phosphor-containing nanoparticle, and the phosphor-containing nanoparticle comprises a base material and the fluorescent substances, and
wherein the base material includes silica.
6. The method for staining the tissue section according to claim 1 , further comprising counting the bright spots to identify the amount of the specific biological substance.