Pretreatment solution for immunohistochemical staining and condensed solution thereof

Abstract

Disclosed are a pretreatment solution for immunohistochemical staining, which elutes a paraffin-containing embedding medium from a glass slide with a tissue specimen embedded in the medium, and retrieves antigenicity of the tissue specimen, and which is usable three or more times, and a pretreatment solution concentrate for immunohistochemical staining which allows ready preparation of the pretreatment solution. The pretreatment solution for immunohistochemical staining contains an antigen retrieving agent, particular nonionic surfactants, and cyclodextrin or a derivative thereof, with the balance being not less than 80 mass % of water. The content of the antigen retrieval agent is such that the pH of the pretreatment solution is in a predetermined range, and the content of cyclodextrin or a derivative thereof is a particular amount.

Description

FIELD OF ART[0001]The present invention relates to a pretreatment solution and a solution concentrate thereof for immunohistochemical staining, which solution allows immunohistochemical staining to be conducted in a short time and with less labor, the immunohistochemical staining including: eluting a paraffin-containing embedding medium from a glass slide with a tissue specimen as an antigen embedded in the medium; antigen retrieving; washing; reacting with an antibody; and staining. In particular, the present invention relates to a pretreatment solution and a solution concentrate thereof for immunohistochemical staining, which solution functions both to elute a paraffin-containing embedding medium for immunohistochemical staining from a glass slide with a tissue specimen embedded in the medium and to retrieve antigenicity, which allows for sufficient staining intensity in the subsequent immunohistochemical staining, and which maintains the eluted embedding medium dispersed therein ...

AI Technical Summary

Benefits of technology

[0018]It is an object of the present invention to provide a pretreatment solution for immunohistochemical staining which functions in immunohistochemical staining both to elute a paraffin-containing embedding medium from a glass slide with a tissue specimen in the form of a sliced tissue section adhered to the slide and embedded in the medium, and to retrieve antigenicity of the tissue specimen, which allows for sufficient staining intensity in the subsequent immunohistochemical staining, which maintains the eluted embedding medium dispersed therein even after its first use, which is usable three or more consecutive times, and which is excellently safe.

[0019]It is another object of the present invention to provide a pretreatment solution for immunohistochemical staining, which solves the above problems, and which, upon staining subsequent to the elution of a paraffin-containing embedding medium from a glass slide with a tissue specimen in the form of a sliced tissue section adhered to the slide and embedded in the medium, and the antigen retrieval of the tissue specimen, inhibits a staining reagent from being repelled on the portion of the glass slide without the tissue specimen to thereby prevent uneven staining.

[0020]It is another object of the present invention to provide a pretreatment solution concentrate for immunohistochemical staining, which may easily be prepared into the pretreatment solution for immunohistochemical staining achieving the above objects.Means for Solving the Problems

Problems solved by technology

The organic solvents used in the first step of the pretreatment, such as xylene, benzene, or toluene, are highly toxic and volatile, which requires exhaust equipment such as draft, and disadvantageously affects the environment of engaged technicians.

On the other hand, Patent Publication 1 discloses in Example 7 that, when the above-mentioned solution used in the pretreatment is used consecutively, the residual paraffin eluted in the solution after the pretreatment adheres to a next slide, so that this solution is not suitable for consecutive use.

Further, when a solution of the composition disclosed in Patent Publication 1 is made to have an alkaline pH, in the immunohistochemical staining following the pretreatment, the glass slide with the tissue specimen adhered thereto is prone to repel the staining reagent at portions free of the tissue specimen, resulting in uneven staining.

However, in these publications, consecutive use of the pretreatment solution is not intended either, similarly to the solution of Patent Publication 1, and there is no description of a technology such as for dispersing the eluted paraffin in the solution, or the like.

Thus it is likely that the pretreatment solutions disclosed in these publications, when used consecutively, also have the same problems as that of Patent Publication 1.

Further, in all of such products, hydrophobic paraffin eluted into the pretreatment solution during use often floats on the solution surface.

Such insoluble paraffin on the solution surface adheres to a glass slide with a tissue specimen when it is taken out of the solution, so that more washing steps are required before the subsequent staining, which complicates the operation.

Otherwise, the insoluble paraffin adversely affects the subsequent immunohistochemical staining.

Further, when staining is performed in an automatic immunohistochemical stainer, the insoluble paraffin may adversely affect the stainer.