title: Stimulation in primary MLR caused by a PLT defined non-HLA-D/DR determinant, EP1.
abstract: The influence in primary mixed lymphocyte culture reaction (MLR) of a primed lymphocyte typing (PLT) defined non-HLA-D/DR determinant, EP1, was investigated. In primary MLR between HLA-D/DR compatible lymphocytes, the response of the lymphocytes from 14 EP1-negative HLA-D/DR heterozygous individuals towards two EP1-positive homozygous typing cells (HTCs) was on an average approximately 35% higher than the response towards two EP1-negative HTCs (P less than 0.01). The strength of the MLR between lymphocytes from 25 EP1-negative and 10 EP1-positive individuals matched for two HLA-D/DR antigens was investigated. The average responses of EP1-negative lymphocytes against EP1-positive lymphocytes were approximately 40% higher than the average responses against EP1-negative lymphocytes (P less than 0.01). These data indicate that the PLT defined determinant EP1 causes stimulation in primary MLR.
mesh_terms: D000939:Epitopes / Q000276:immunology; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D006801:Humans; D066298:In Vitro Techniques; D007519:Isoantigens / Q000276:immunology; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed
chemical_list: D000939:Epitopes; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007519:Isoantigens