title: Loss of nm23 and Alu DNA in human lung cancer propagated in nude mice.
abstract: Freshly resected human non-small cell lung cancer (NSCLC) has been successfully transplanted and propagated subcutaneously in nude mice (Cancer Letters 61 (1991) 53-60). We used this model to study the changes of the human metastasis suppressor genes, nm23-H1 and nm23-H2, through the process of propagation and metastasis of human NSCLC. Using a non-radioisotopic Southern analysis, the nm23-H1 and nm23-H2 genes were detected without evidence of deletion in the early generations of the tumor grafts. These genes, however, were absent from the tumor grafts sampled past 4 generations of propagation and from all the propagated metastases originated from the subcutaneous grafts. Further restriction analysis revealed that only mouse DNA, but no human Alu DNA, was present in the tumor specimens which lacked the human nm23 genes. Thus, there is a loss of human DNA but a gain of mouse DNA in the propagated tumors originated from the transplanted human NSCLC. The mechanisms of loss of human DNA in these propagated tumors in nude mice have yet to be delineated.
mesh_terms: D000818:Animals; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D004247:DNA / Q000032:analysis*; D016147:Genes, Tumor Suppressor; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D020559:Monomeric GTP-Binding Proteins; D054778:NM23 Nucleoside Diphosphate Kinases; D009368:Neoplasm Transplantation; D009701:Nucleoside-Diphosphate Kinase; D012091:Repetitive Sequences, Nucleic Acid; D014157:Transcription Factors / Q000235:genetics*; D014183:Transplantation, Heterologous
chemical_list: D054778:NM23 Nucleoside Diphosphate Kinases; D014157:Transcription Factors; D004247:DNA; C517938:NME1 protein, human; C517939:Nme1 protein, mouse; D009701:Nucleoside-Diphosphate Kinase; D020559:Monomeric GTP-Binding Proteins