title: Brief communication, P53 accumulation in N-methyl-N-nitrosourea-induced rat mammary tumors.
abstract: P53 aberrant protein expression and mutation is a component of many human tumors but less information is available regarding involvement in relevant animal models. We have examined invasive mammary epithelial neoplasms for p53 aberrant protein expression from Sprague-Dawley rats induced by two intrajugular injections of N-methyl-N-nitrosourea (NMU, 50 mg/kg), 7 days apart, beginning at 44-49 days of age. Positive nuclear staining was observed in 8/10 mammary tumor frozen sections using PAb 421, a mouse monoclonal antibody, compared to a mixed mouse IgG negative control antibody. Paraffin sections from two additional sets of similarly induced rat mammary tumors also showed positive nuclear staining (22/37 tumors) with CM-5, a rabbit polyclonal antibody. Our results indicate that elevated cellular content of p53 is a common event in invasive palpable mammary tumors induced by NMU in this dual-injection model system.
authors: Department of Surgery, Medical College of Ohio, Toledo 43699-0008, USA.
authors: K A
authors: KA
authors: Crist
authors: R D
authors: RD
authors: Fuller
authors: B
authors: B
authors: Chaudhuri
authors: P
authors: P
authors: Chaudhuri
authors: M
authors: M
authors: You
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D005260:Female; D007150:Immunohistochemistry; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D008770:Methylnitrosourea; D016612:Paraffin Embedding; D051381:Rats; D017207:Rats, Sprague-Dawley; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D016159:Tumor Suppressor Protein p53; D008770:Methylnitrosourea