Functional reconstitution of class II MHC-Restricted T cell immunity mediated by retroviral transfer of the alpha beta TCR complex

Transfer of the alpha beta TCR genes into T lymphocytes will provide a mean s to enhance Ag-specific immunity by increasing the frequency of tumor- or pathogen-specific T lymphocytes. We generated an efficient alpha beta TCR g ene transfer system using two independent monocistronic retrovirus vectors harboring either of the class II MHC-restricted alpha or beta TCR genes spe cific for chicken OVA. The system enabled us to express the clonotypic TCR in 44% of the CD4(+) T cells. The transduced cells showed a remarkable resp onse to OVA(323-339) peptide in the in vitro culture system, and the respon se to the Ag was comparable with those of the T lymphocytes derived from tr ansgenic mice harboring OVA-specific TCR, Adoptive transfer of the TCR-tran sduced cells in mice induced the Ag-specific delayed-type hypersensitivity in response to OVA(323-339) challenge. These results indicate that alpha be ta TCR gene transfer into peripheral T lymphocytes can reconstitute Ag-spec ific immunity. We here propose that this method provides a basis for a new approach to manipulation of immune reactions and immunotherapy.