PMID- 1331537 OWN - NLM STAT- MEDLINE DCOM- 19921215 LR - 20200724 IS - 0022-538X (Print) IS - 1098-5514 (Electronic) IS - 0022-538X (Linking) VI - 66 IP - 12 DP - 1992 Dec TI - A mouse mammary tumor virus mammary gland enhancer confers tissue-specific but not lactation-dependent expression in transgenic mice. PG - 7529-32 AB - The long terminal repeat (LTR) of mouse mammary tumor virus (MMTV) is known to contain a number of transcriptional regulatory elements, including glucocorticoid response elements. In this study, we showed that a mammary gland/salivary gland enhancer found in the LTR of this virus directs expression of a heterologous promoter to both virgin and lactating mammary glands in transgenic mice. Using transgenic mice containing hybrid gene constructs with various deletions of the LTR sequences linked to marker genes, we also showed that the dramatic increase in MMTV expression that occurs during lactation is due to the glucocorticoid response elements. Thus, the MMTV LTR encodes two distinct elements, both of which are required for a high level of expression in lactating mammary glands. FAU - Mok, E AU - Mok E AD - Department of Biochemistry, University of Illinois, Chicago 60612. FAU - Golovkina, T V AU - Golovkina TV FAU - Ross, S R AU - Ross SR LA - eng GR - CA45954/CA/NCI NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - J Virol JT - Journal of virology JID - 0113724 RN - EC 2.3.1.28 (Chloramphenicol O-Acetyltransferase) SB - IM MH - Animals MH - Chloramphenicol O-Acetyltransferase/genetics/metabolism MH - *Enhancer Elements, Genetic MH - Female MH - *Gene Expression Regulation, Viral MH - Lactation/*physiology MH - Mammary Glands, Animal/microbiology MH - Mammary Tumor Virus, Mouse/*genetics MH - Mice MH - Mice, Transgenic MH - Organ Specificity MH - *Repetitive Sequences, Nucleic Acid PMC - PMC240463 EDAT- 1992/12/01 00:00 MHDA- 1992/12/01 00:01 PMCR- 1992/12/01 CRDT- 1992/12/01 00:00 PHST- 1992/12/01 00:00 [pubmed] PHST- 1992/12/01 00:01 [medline] PHST- 1992/12/01 00:00 [entrez] PHST- 1992/12/01 00:00 [pmc-release] AID - 10.1128/JVI.66.12.7529-7532.1992 [doi] PST - ppublish SO - J Virol. 1992 Dec;66(12):7529-32. doi: 10.1128/JVI.66.12.7529-7532.1992.