title: Cytogenetic studies on rat thymic lymphomas induced by N-propyl-N-nitrosourea.
abstract: N-Propyl-N-nitrosourea (PNU) was proved to be a strong leukemogen, which induces myelogenous leukemia or thymic lymphoma in rats. BUF/Mna rats and F344 rats were the strain most susceptible to thymic lymphomagenic activity of PNU. In addition, F1 rats between BUF/Mna and WKY rats were also susceptible to PNU-lymphomagenic activity. In the present experiment, karyotypes of 31 thymic lymphomas induced by PNU in BUF/Mna rats and in F1 rats between BUF/Mna and WKY rats were analysed for chromosomal abnormalities. Although no specific chromosomal abnormalities were observed throughout all lymphomas, del(11q) and dup(2q) were observed frequently in BUF/Mna rat lymphomas. Breakpoints and/or fusion-points were frequently observed in chromosome 11, followed by chromosomes 2, 5 and 6. Trisomy of chromosome 7, on which c-myc oncogene is mapped, was observed in seven cases, and monosomy of chromosomes 12, 18, 19, 20 and X was seen in seven or eight cases each, though these changes were generally observed in minor cell population in each case.
mesh_terms: D000818:Animals; D002869:Chromosome Aberrations / Q000139:chemically induced / Q000235:genetics*; D002871:Chromosome Banding; D025063:Chromosome Disorders; D004198:Disease Susceptibility; D005260:Female; D007621:Karyotyping; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000139:chemically induced / Q000235:genetics*; D008297:Male; D009607:Nitrosourea Compounds; D051381:Rats; D011915:Rats, Inbred BUF; D011921:Rats, Inbred WKY; D013953:Thymus Neoplasms / Q000139:chemically induced / Q000235:genetics*
chemical_list: D009607:Nitrosourea Compounds; C020796:propylnitrosourea