DELETION AND DIFFERENTIAL EXPRESSION OF P16(INK4A) IN MOUSE LUNG-TUMORS

Recent allelotyping of chemical-induced lung tumors in hybrid mice has detected loss of heterozygosity on chromosome 4 in a region involving the interferon-alpha (IFN-alpha) gene cluster that is syntenic to hum an chromosome 9p21-22, the location of the p16(INK4a) (p16) and p15(IN K4b) (p15) tumor suppressor genes, The purpose of the current investig ation was to characterize the expression of p16 and p15 in lung tumors and tumor-derived cell lines induced in A/J mice by exposure to the t obacco-specific nitrosamine, 4-methyl-nitrosamino-1-(3-pyridyl)-1-buta none (NNK), Expression of p16 and p15 was detected in all primary lung tumors; however, levels of expression of p16 differed by up to 15-fol d between tumors. This is the first study to note a marked difference in the expression of the p16 gene in primary lung tumors, The apparent low levels of expression seen in approximately half of the tumors was not attributed to deletion, mutation or methylation of the p16 gene, Conversely, the high levels of p16 expression were not the result of e ffects on the retinoblastoma gene (Rb) or cyclin D1 proteins but most likely in response to a dysfunction elsewhere within this pathway, In contrast to the detection of p16 expression in primary tumors, this ge ne was deleted in all four cell lines, Three of four cell lines also s howed loss of the p15 gene, Mapping of these homozygous deletions on c hromosome 4 revealed that the p16 gene resides near the D4MIT77 marker , which is located approximately 12 cM proximal to the IFN-alpha gene cluster, thereby implicating the p16 gene as one of the targets within the allelic deletions detected previously in primary lung tumors from hybrid mice.