PMID- 2535722 OWN - NLM STAT- MEDLINE DCOM- 19890118 LR - 20200724 IS - 0022-538X (Print) IS - 1098-5514 (Electronic) IS - 0022-538X (Linking) VI - 63 IP - 1 DP - 1989 Jan TI - Isolation of a pathogenic clone of mouse mammary tumor virus. PG - 148-58 AB - Exogenous mouse mammary tumor virus (MMTV) was cloned from a GR mammary tumor. Clone lambda GRT39 contained a full-length integrated MMTV(GR) provirus and both 5' and 3' host flanking DNA. The lambda GRT39 provirus had no apparent structural changes associated with cloning and retained the exogenous MMTV gag gene poison sequence. When introduced into rat mammary adenocarcinoma LA7 cells, the lambda GRT39 provirus was fully expressed. lambda GRT39-transfected LA7 cells made MMTV RNA, had gp52 SU protein on the cell surface, and produced B-type retrovirus particles characteristic of MMTV. Mammary tumors developed in hormone-stimulated BALB/c females injected with MMTV from lambda GRT39-transfected LA7 cells [MMTV (lambda GRT39)]. The tumors had new, clonally integrated copies of the MMTV(lambda GRT39) provirus and were expressing MMTV antigen. These data indicate that the lambda GRT39 provirus is biologically active and pathogenic. FAU - Morris, D W AU - Morris DW AD - Department of Pathology, School of Medicine, University of California, Davis 95616. FAU - Bradshaw, H D Jr AU - Bradshaw HD Jr FAU - Billy, H T AU - Billy HT FAU - Munn, R J AU - Munn RJ FAU - Cardiff, R D AU - Cardiff RD LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Virol JT - Journal of virology JID - 0113724 RN - 0 (DNA, Viral) SB - IM MH - Adenocarcinoma/*microbiology MH - Animals MH - Animals, Newborn MH - Blotting, Southern MH - Cloning, Molecular MH - DNA, Viral/analysis/genetics MH - Female MH - Gene Expression Regulation MH - Mammary Neoplasms, Experimental/*microbiology MH - Mammary Tumor Virus, Mouse/genetics/*pathogenicity/ultrastructure MH - Mice MH - Mice, Inbred BALB C MH - Microscopy, Electron MH - Proviruses/genetics/pathogenicity MH - Rats MH - Restriction Mapping MH - Tumor Cells, Cultured PMC - PMC247667 EDAT- 1989/01/01 00:00 MHDA- 2001/03/28 10:01 PMCR- 1989/01/01 CRDT- 1989/01/01 00:00 PHST- 1989/01/01 00:00 [pubmed] PHST- 2001/03/28 10:01 [medline] PHST- 1989/01/01 00:00 [entrez] PHST- 1989/01/01 00:00 [pmc-release] AID - 10.1128/JVI.63.1.148-158.1989 [doi] PST - ppublish SO - J Virol. 1989 Jan;63(1):148-58. doi: 10.1128/JVI.63.1.148-158.1989.