Alloantibodies that react with subsets of human T cells

Area of Science:

• Immunology
• Transplantation immunology

Background:

• Alloantibodies can pose challenges in transplantation and pregnancy.
• Human Leukocyte Antigen (HLA) antibodies are common in pregnant women.
• Distinguishing T cell alloantibodies from HLA antibodies is crucial.

Purpose of the Study:

• To investigate the presence and specificity of T cell alloantibodies in pregnant women.
• To develop a method to detect T cell alloantibodies without interference from HLA antibodies.

Main Methods:

• Utilized the two-color fluorescence (TCF) method for antibody detection.
• Selected serum donors with specific HLA types (HLA-A1, -B8, -DRw3) to minimize HLA antibody interference.
• Tested sera on a panel of individuals homozygous for the same HLA types.
• Enriched peripheral blood mononuclear lymphocytes for Tgamma cells to differentiate reactivity.

Main Results:

• Detected alloantibodies against T cell subsets in sera from pregnant women.
• Identified sera reacting specifically with Tgamma lymphocytes.
• Identified sera reacting specifically with Tmu lymphocytes.
• Observed some sera reacting with both Tgamma and Tmu lymphocytes.

Conclusions:

• Pregnant women can develop alloantibodies against distinct T cell subsets (Tgamma and Tmu).
• The TCF method, with careful donor selection, can effectively detect these T cell alloantibodies.
• This finding has implications for understanding immune responses during pregnancy and in transplantation.