IgE antibody against hepatitis B surface antigen in mice

Area of Science:

• Immunology
• Allergy Research
• Hepatitis B Research

Background:

• Hepatitis B surface antigen (HBs antigen) is a key component in Hepatitis B virus (HBV) infections.
• Understanding IgE antibody production is crucial for diagnosing and managing allergic responses.
• The passive cutaneous anaphylaxis (PCA) test is a standard method for detecting IgE antibodies, but requires sufficient purified antigen.

Purpose of the Study:

• To investigate the potential of Hepatitis B surface antigen (HBs antigen) to induce immunoglobulin E (IgE) production in mice.
• To evaluate the efficacy of the Prausnitz-Küstner (PK)-type skin test in rats for detecting mouse-derived IgE antibodies against HBs antigen.
• To establish a reliable method for IgE detection when limited amounts of purified antigen are available.

Main Methods:

• Mice were injected with Hepatitis B surface antigen (HBs antigen) to assess IgE production.
• Sera from immunized mice were tested using the Prausnitz-Küstner (PK)-type skin test in rats.
• Characterization of the active principle in the PK test involved heat inactivation, protein A binding, and antisera elimination to confirm IgE specificity.

Main Results:

• Hepatitis B surface antigen (HBs antigen) successfully elicited IgE production in mice.
• The Prausnitz-Küstner (PK)-type skin test in rats demonstrated positive results, indicating the presence of IgE antibodies to HBs antigen.
• The antibody detected was confirmed as IgE due to its heat lability, lack of protein A binding, and sensitivity to anti-mouse IgE antisera.

Conclusions:

• Hepatitis B surface antigen (HBs antigen) can induce a specific IgE antibody response in mice.
• The Prausnitz-Küstner (PK)-type skin test in rats is a viable alternative for detecting mouse IgE antibodies when antigen quantities are insufficient for PCA.
• This study validates the PK-type test in rats as a sensitive tool for IgE antibody detection in immunological research.