H-2 gene complex restricts transfer of delayed-type hypersensitivity in mice

Area of Science:

• Immunology
• Genetics

Background:

• Delayed-type hypersensitivity (DTH) is a cell-mediated immune response.
• The H-2 gene complex in mice plays a critical role in immune regulation.
• Previous studies suggested genetic restrictions in adoptive transfer of immune states.

Purpose of the Study:

• To investigate the genetic requirements for the adoptive transfer of DTH to soluble protein antigens.
• To determine the specific regions of the H-2 gene complex essential for this transfer.

Main Methods:

• Adoptive transfer of sensitized lymphocytes from donor mice to naive recipient mice.
• Utilizing mice with defined H-2 haplotypes, including identity or disparity at K, D, and I-A regions.
• Assessing the induction of DTH in recipient mice.

Main Results:

• Successful transfer of DTH was strictly dependent on sharing the I-A region of the H-2 gene complex between donor and recipient.
• Identity at the K or D regions of the H-2 complex was not necessary for successful transfer.
• Evidence suggested the restriction was not due to cell homing or destruction.

Conclusions:

• The I-A region of the H-2 complex is crucial for the adoptive transfer of DTH to soluble protein antigens.
• This genetic restriction likely reflects an immune response gene (Ir-gene) controlled mechanism.
• Effective interaction between sensitized T lymphocytes and antigen presented by macrophages is essential and governed by I-A region genes.