Sera from volunteers immunized by planned blood transfusions as source of DR cytotoxic typing reagents.

Sera from volunteers immunized with planned blood transfusions were tested for anti DR cytotoxic antibodies with a panel of HLA typed cultured human lymphoid cells using a variety of serological techniques. The majority of sera contained DR cytotoxic antibodies. The specificity of DR antibodies in seven sera was determined by testing them with a panel of B peripheral lymphocytes typed with DR alloantisera submitted to the 7th International Histocompatibility Workshop. The temporal evolution of DR and HLA-A and B cytotoxic antibodies was determined in two subjects by testing serial bleedings with B lymphoid cells, coated with Fab2 fragments from anti beta 2 mu and anti DR xenoantisera. Results indicated a parallel evolution of DR and HLA-A and B cytotoxic antibodies.