Detection of Porcine MHC Class II Antigens in Different Immunoassays

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Abstract
A monoclonal antibody (Mab), Mab 4-24-11, to human class II major histocompatibility antigens has been tested in commonly used immunoassays for detection of porcine class II major histocompatibility antigens (SLA-D). In a radioimmunoprecipitation assay, Mab 4-24-11 reacted with proteins from mitogen-stimulated porcine mononuclear cells (MNC). The molecular weights of the precipitated proteins were approximately 34 and 28 Kd. In indirect immunofluorescence, approximately 25% of porcine MNC in suspension reacted with Mab 4-24-11. This percentage diminished to 14% when Ig bearing MNC were removed, while it increased to 36% when adherent MNC were enriched. Thus, it was concluded that Mab 4-24-11 cross-reacts with SLA-D. In a immunohistochemical study, Mab 4-24-11 reacted with cells in acetone fixed cryostat sections from the gastric mucosa and endometrium. These properties of Mab 4-24-11 make it useful as a tool for further studies on the porcine immune system.