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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1981 Apr;78(4):2038–2042. doi: 10.1073/pnas.78.4.2038

Hormone-responsive expression of an endogenous proviral gene of mouse mammary tumor virus after molecular cloning and gene transfer into cultured cells.

N E Hynes, N Kennedy, U Rahmsdorf, B Groner
PMCID: PMC319278  PMID: 6264458

Abstract

A recombinant lambda phage containing mouse mammary tumor virus (MMTV) proviral DNA was isolated from a gene library constructed from GR mouse liver DNA. Restriction enzyme analyses reveal that the cloned molecule contains a copy of one of the GR endogenous MMTV proviruses flanked on both sides by 2--3 kb of mouse genomic DNA. In this report we have examined the expression of the cloned MMTV provirus after cotransfection with the herpes thymidine kinase (TK; ATP:thymidine 5'-phosphotransferase,, EC 2.7.1.21) gene and integration into mouse LTK- cells. Nine individual TK+ transformants were selected, and all were found to contain MMTV-transfected DNA. One of the TK+ transformants was chosen for further study. Total poly(A)-containing RNA was isolated from the cells, and liquid hybridization analyses with MMTV cDNA showed that it contained 0.02% MMTV-specific RNA. The sizes of the MMTV-specific species were determined and found to correspond to the 35S and 24S mRNAs synthesized in MMTV-infected cells. Glucocorticoid hormones have been shown to increase the concentration of MMTV RNA in virus-infected cultured cells. Therefore, we tested the effect of dexamethasone on the concentration of MMTV-specific RNA in cells transfected with the MMTV proviral DNA. The amount of MMTV-specific poly(A)-containing RNA found in the cells grown in the presence of hormone was 0.17%. Therefore, dexamethasone causes an 8-fold increase in the amount of MMTV-specific RNA in mouse cells containing several copies of a cloned and transfected MMTV proviral gene.

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Selected References

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