Parasite antigen-specific human T cell lines and clones. Major histocompatibility complex restriction and B cell...

Area of Science:

• Immunology
• Parasitology

Background:

• T lymphocyte lines and clones are vital for studying T cell recognition and B cell interactions.
• Investigating human T cell responses to parasitic infections requires specific cell lines.

Purpose of the Study:

• To derive and characterize human antigen-specific T cell lines and clones from a filarial infection patient.
• To explore the role of these T cells in host immune responses to helminth infections.

Main Methods:

• Derived human antigen-specific T cell lines and clones from a patient with filarial infection.
• Characterized T cells for helper phenotype (Leu 1+, Leu 2-, Leu 3+) and interleukin-2 independence.
• Assessed T cell proliferation requiring antigen-presenting cells and antigen.
• Evaluated helper function for parasite-specific antibody induction.
• Determined HLA-DR restriction in T cell responses.

Main Results:

• Generated T cell lines and clones with helper phenotype, independent of exogenous interleukin-2.
• Demonstrated optimal T cell proliferation dependent on antigen-presenting cells and antigen.
• Observed antigen-dose dependent helper function for parasite-specific antibody induction.
• Confirmed absolute requirement for HLA-DR histocompatible antigen-presenting cells.
• Showed DR-related restriction in antigen-stimulated proliferative responses of T cell clones.

Conclusions:

• Human antigen-specific T cell lines and clones are valuable tools for studying host responses to helminth infections.
• These T cell lines and clones aid in understanding human T cell and B cell interactions in response to parasite antigens.