HLA DPw1 class II molecules on human T cells

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• Human T cells express Human Leukocyte Antigen (HLA) class II molecules when activated by various stimuli.
• While HLA-DR and HLA-DQ expression on T cells is established, HLA-DP expression is less understood due to methodology limitations.

Purpose of the Study:

• To investigate the expression and function of HLA class II molecules, specifically HLA-DP, on activated human T cells.
• To characterize alloreactive T-cell clones specific for DPw1-associated antigens.

Main Methods:

• Derivation of alloreactive T-cell clones using limiting dilution with DPw1-positive stimulator peripheral blood lymphocytes (PBLs) and IL-2.
• Screening of T-cell clones on DPw1-positive and DPw1-negative PBLs in proliferation assays.
• Assaying T-cell clone responses to irradiated T-cell clones expressing DPw1-associated alloantigens.

Main Results:

• Seven DPw1-specific T-cell clones were generated.
• One clone (TLC 56.26) showed a strong response to alloantigens on the stimulator T-cell panel.
• Six clones exhibited varying degrees of response, confirming recognition of DP-associated determinants on PBLs.

Conclusions:

• Activated human T cells can express HLA-DP molecules.
• Specific T-cell clones can recognize DPw1-associated alloantigens, providing a tool to study HLA-DP expression on T cells.