Tissue staining method
It is an object of the present invention to provide a tissue staining method that makes it possible to observe both information on the morphology of a tissue and information on a biological substance such as an antigen molecule to be detected on a single section and in a single view field. The present invention provides a tissue staining method, including carrying out (A) a HE (hematoxylin-eosin) staining, and (B) a histochemical staining, serially on a single tissue section, wherein the histochemical staining is defined as a histochemical technique for detecting a biological substance to be detected in a tissue in a visible manner by use of a binding reaction between the biological substance to be detected and a probe biological substance capable of binding specifically to the biological substance to be detected.
1. A tissue staining method comprising:
providing a tissue section for histochemical staining, wherein the tissue section comprises a target substance and the tissue section is embedded in paraffin;
removing the paraffin from the tissue section;
reacting a labeled probe with the target substance in the tissue to obtain a histochemical stained tissue section;
fixing the histochemical stained tissue section to create a fixed histochemical stained tissue section;
staining the fixed histochemical stained tissue section with a hematoxylin and eosin (HE) stain to obtain a HE stained, histochemical stained tissue section;
irradiating the HE stained, histochemical stained tissue section with an excitation light;
obtaining a morphological image of the irradiate, HE stained, histochemical stained tissue section by imaging the irradiate, HE stained, histochemical stained tissue with a camera and obtaining a fluorescent image of the tissue or a fluorescent image of the eosin;
determining a distribution of the target substance to be detected from the irradiate, HE stained, histochemical stained tissue section by obtaining a fluorescent image of the labeled probe with a camera,
wherein the labeled probe specifically binds to the target substance to be detected in the tissue section and provides the fluorescent signal showing the distribution of the target substance,
wherein the labeled probe comprise a probe and a label,
wherein the label is a fluorescent aggregate comprising a particle having a plurality of organic fluorescent dyes on the surface of or inside the particle and has an emission wavelength of 580 nanometer (nm) or greater, wherein the fluorescent aggregate has an excitation wavelength of 580 nm or greater,
wherein the fluorescent aggregate has an excitation wavelength ranging from 560 nm to 590 nm, and
wherein the fluorescent aggregate has an average particle size ranging from 50 nm to 200 nm.
2. The tissue staining method according to claim 1 , wherein the histochemical staining is immunohistochemical staining.
3. The tissue staining method according to claim 1 , wherein the histochemical staining is lectin staining.
4. The tissue staining method according to claim 1 , wherein the fluorescent aggregate is
a core/shell-structure particle having a core and the organic fluorescent dyes immobilized on the core, or
a fluorescent body-encapsulating nanoparticle having a substrate and the organic fluorescent dyes encapsulated in the substrate.
5. The tissue staining method according to claim 1 , wherein the particle of the fluorescent aggregate is a silica nanoparticle.
6. The tissue staining method according to claim 1 , wherein a variation coefficient of diameter of the fluorescent aggregate is not more than 15%.
7. The tissue staining method according to claim 1 , wherein a variation coefficient of diameter of the fluorescent aggregate is in a range of 5 to 15%.