title: Immunogenicity of H-2 positive and H-2 negative clones of a mouse tumour, GR9.
abstract: The GR9 tumour was induced with methylcholanthrene in a BALB/c mouse, adapted to tissue culture and cloned without any passage in vivo GR9 clones were typed for H-2 with three monoclonal antibodies that define H-2Kd + Dd, Kd and Dd antigens. A great heterogeneity of H-2d expression was found from clones which were Kd and Dd positive to clones Kd and Dd negative. These results were confirmed for A7 and B9 clones using immunoprecipitation with anti-H-2D.4 and anti-H-2K.31 alloantisera and SDS-PAGE analysis. In addition, the number of chromosomes per cell was heterogeneous amongst the clones, ranging from 38 +/- 2 to pseudotetraploid clones which have 75 +/- 2 chromosomes. GR9 clones were injected into syngeneic BALB/c mice to measure local tumour growth. We found that the growth correlated with the amount of H-2 antigen expressed, i.e. clones with low H-2d expression were highly malignant while clones with normal H-2d expression were highly immunogenic. Finally we found that BALB/c mice immunized against A7 (Kd, Dd-positive) protected against A7, as expected, but surprisingly also against B9 (Kd, Dd-negative).
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D003429:Cross Reactions; D005786:Gene Expression Regulation; D006183:H-2 Antigens / Q000235:genetics / Q000276:immunology*; D006649:Histocompatibility Antigens / Q000235:genetics / Q000276:immunology*; D008748:Methylcholanthrene; D051379:Mice; D008815:Mice, Inbred Strains; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000139:chemically induced / Q000235:genetics / Q000276:immunology*; D011123:Polyploidy; D014185:Transplantation, Isogeneic
chemical_list: D000951:Antigens, Neoplasm; D006183:H-2 Antigens; D006649:Histocompatibility Antigens; C029237:tumor-associated transplantation antigen; D008748:Methylcholanthrene