Immunohistochemical markers for the rodent immune system

Area of Science:

• Toxicology
• Immunology
• Pathology

Background:

• The immune system undergoes significant changes in response to various insults like chemical toxins, irradiation, and infectious agents.
• Histopathology and immunohistochemistry (IHC) are crucial for detecting these morphologic, biochemical, and molecular alterations in tissues and cells.
• Cells alter protein expression (antigens) in response to xenobiotics, which can be visualized using IHC.

Purpose of the Study:

• To review the specialized procedures and methods used in immunohistochemistry (IHC) for antigen detection.
• To illustrate the effective application of IHC in characterizing the immunotoxicologic effects of various agents.
• To provide insights into the selection of antibodies, tissue types, and specific IHC techniques.

Main Methods:

• Review of antibodies, their sources, and utilization with frozen or fixed paraffin-embedded tissues.
• Detailed examination of specific IHC methods, including antigen retrieval techniques.
• Discussion of critical procedural elements such as fixation, tissue processing, and immunoreactions.

Main Results:

• IHC enables the detection and characterization of altered protein expression in cells responding to toxic insults.
• Specific IHC protocols are essential for accurately identifying immunotoxicologic effects.
• The choice of antibodies, tissue preparation, and antigen retrieval methods significantly impacts IHC results.

Conclusions:

• Immunohistochemistry is a powerful tool for visualizing and understanding the cellular and molecular responses to immunotoxic agents.
• Mastery of IHC techniques, including antigen retrieval, is vital for accurate immunotoxicologic assessment.
• This review highlights the importance of IHC in the field of toxicology and immunology for characterizing agent-induced immune system changes.