Title : Alterations in H-ras1 promoter conformation during N-nitroso-N-methylurea-induced mammary carcinogenesis and pregnancy.

Pub. Date : 1996 Nov 1

PMID : 8895746






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1 Alterations in H-ras1 promoter conformation during N-nitroso-N-methylurea-induced mammary carcinogenesis and pregnancy. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus
2 We previously demonstrated that H-ras1 oncogene mutations detected in N-nitroso-N-methylurea (NMU)-induced mammary tumors arose as background mutations within rat mammary cells (RMCs) and that NMU promoted the outgrowth of these preexisting mutants. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus
3 We previously demonstrated that H-ras1 oncogene mutations detected in N-nitroso-N-methylurea (NMU)-induced mammary tumors arose as background mutations within rat mammary cells (RMCs) and that NMU promoted the outgrowth of these preexisting mutants. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus
4 We previously demonstrated that H-ras1 oncogene mutations detected in N-nitroso-N-methylurea (NMU)-induced mammary tumors arose as background mutations within rat mammary cells (RMCs) and that NMU promoted the outgrowth of these preexisting mutants. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus
5 We have now detected a putative DNA structure in the H-ras1 promoter of RMCs in vivo that was absent in NMU-induced mammary tumor cells. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus
6 We hypothesize that the NMU-induced alterations in promoter conformation irreversibly deregulates H-ras1 expression in initiated cells, thereby increasing the phenotypic penetrance of the conditional H-ras1 mutations. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus
7 We hypothesize that the NMU-induced alterations in promoter conformation irreversibly deregulates H-ras1 expression in initiated cells, thereby increasing the phenotypic penetrance of the conditional H-ras1 mutations. Methylnitrosourea HRas proto-oncogene, GTPase Rattus norvegicus